Crack repair maintenance auxiliary system for gasifier inner shell

Abstract

This invention relates to an auxiliary system for repairing cracks in the inner shell of a gasifier. The system includes a grinding device and a wireless camera mounted on an mounting arm. The mounting arm comprises a central arm and a hinged arm hinged to the bottom of the central arm. The central arm is hollow, and a limiter is fixed to its bottom side wall. One end of the hinged arm is hinged to the bottom of the central arm, and the other end is equipped with the grinding device. The hinged arm also houses the wireless camera and a connecting ring, which is connected to one end of a steel cable. The other end of the cable freely passes through the central arm, passes around a fixed pulley rotatably mounted inside the central arm, and extends upwards to the top of the central arm to connect with a cable winding device. When the cable winding device is activated, it pulls the steel cable upwards, causing the hinged arm, normally collinear with the cantilever, to rotate upwards and become perpendicular to the central arm when it contacts the limiter. This invention allows for convenient, efficient, and precise repair of cracks in the inner shell of a gasifier.

Description

Technical Field

[0001] This invention relates to the field of gasifier repair equipment technology, specifically to an auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier. Background Technology

[0002] Gasifiers are key pieces of equipment in industries such as coal chemical and petrochemicals. Their main function is to gasify raw materials, such as coal and petroleum coke, under high temperature and high pressure conditions to produce syngas. The inner shell of the gasifier, as a crucial component, operates under harsh conditions of high temperature, high pressure, and corrosive gases for extended periods, making it prone to cracks and other damage. Failure to repair these cracks promptly can affect the normal operation of the gasifier and may even lead to safety accidents. Currently, repairing cracks in the inner shell of a gasifier usually requires workers to enter the gasifier to operate, or to use simple tools for auxiliary repairs. However, the following problems exist.

[0003] Firstly, the internal space of the gasifier's shell is limited, the lighting is dim, and the air circulation is poor. When staff enter the interior to operate, not only is the operating space limited and the environment stuffy, but it is also difficult to accurately locate the actual cracks, resulting in low repair accuracy and difficulty in guaranteeing repair quality.

[0004] Secondly, after years of use, scale or rust will accumulate on the inner wall of the gasifier. As a result, even if someone enters the inner shell of the gasifier, they cannot easily find the cracks under the covering layer. These cracks are hidden and difficult to detect.

[0005] Thirdly, to fully discover these cracks, it would be necessary to manually enter the inner shell of the gasifier and grind them one by one to remove the foreign matter covering layer. However, this would undoubtedly be a huge workload, as operators cannot easily operate inside the gasifier, making it even more difficult to persevere and complete this enormous workload.

[0006] Fourth, when manual entry into the inner shell of the gasifier for grinding, it is difficult to ensure the uniformity and stability of the grinding feed, which can easily lead to uneven grinding. When removing the surface foreign matter covering layer, it is more likely to damage the inner shell of the gasifier itself.

[0007] Finally, the foreign matter covering layer on the inner wall of the gasifier's inner shell is also prone to cracking. When directly inspecting the cracks inside the gasifier's inner shell, it is easy to misjudge them as cracks in the gasifier's inner shell. Therefore, developing an auxiliary device for repairing cracks in the inner shell of a gasifier that can effectively expose the location of cracks, requires no manual intervention, and can be flexibly operated from outside the gasifier has become an urgent problem to be solved. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide an auxiliary system for repairing cracks in the inner shell of a gasifier, so as to accurately, efficiently and conveniently carry out crack repair work on the inner shell of the gasifier.

[0009] This invention is achieved through the following technical solution: A repair and maintenance auxiliary system for cracks in the inner shell of a gasifier includes a remotely operable grinding device and a real-time monitoring system for observing the grinding process. The real-time monitoring system includes at least one wireless camera. The grinding device and the wireless camera are mounted on a mounting arm. The mounting arm includes a central arm and a hinged arm hinged to the bottom of the central arm. The central arm is hollow and has a limiter fixed to its bottom side wall. One end of the hinged arm is hinged to the bottom of the central arm, and the other end is equipped with the grinding device. The wireless camera and a connecting ring are also mounted on the hinged arm. The connecting ring is connected to one end of a steel cable. The other end of the steel cable freely passes into the central arm, passes around a fixed pulley rotatably mounted inside the central arm, and extends upwards out of the top of the central arm to connect with a cable winding device. When the cable winding device is activated, it pulls the steel cable upwards, causing the hinged arm, which is normally collinear with the cantilever, to rotate upwards and become perpendicular to the central arm when it contacts the limiter.

[0010] Furthermore, the limiting component includes a right-angled bent rod, with a limiting block fixed at the bottom end of the bent rod. The limiting block contacts the hinged arm and limits its movement.

[0011] Furthermore, a perforation is provided on the side wall of the central arm, through which the steel cable passes freely and is wound in an S-shape around a pair of fixed pulleys arranged vertically.

[0012] Furthermore, the grinding equipment includes a mounting frame, a grinding wheel, and a drive motor. The mounting frame is a channel steel structure, and the drive motor and the grinding wheel are installed inside it in sequence. The main shaft of the drive motor and the spindle of the grinding wheel are each exposed at one end of the mounting frame, and a first transmission gear is fixed thereon. The two first transmission gears mesh to realize the rotation of the grinding wheel, and the axial direction of the grinding wheel is parallel to the axial direction of the inner shell of the gasifier.

[0013] Furthermore, the wireless camera is hinged and mounted above the hinged arm to allow for adjustment of the monitoring direction; the cable winding device is motor-driven to form the structure of an electric hoist together with the steel cable.

[0014] Furthermore, the central arm is rotatably mounted on a positioning assembly, and the central arm is coaxially located in the inner shell of the gasifier, and the cable winding device is also mounted on the positioning assembly.

[0015] Furthermore, the positioning component includes a base cylinder, the bottom end face of which slides in contact with the inner shell of the gasifier, and a number of radial beams arranged in a ring at the top of the base cylinder. Each radial beam has a sliding beam slidably mounted on its surface, and the sliding direction of the sliding beam is set along the radial direction of the base cylinder. The upper surface of the sliding beam is provided with a planar thread, and a transmission ring that contacts and engages with its upper surface drives the transmission in the form of a planar thread pair. When all the sliding beams are in contact with the top side wall of the inner shell of the gasifier, the base cylinder is centrally located on the outer side of the top of the inner shell of the gasifier.

[0016] Furthermore, an annular guide groove is provided on the inner side of the transmission ring, and a guide ring coaxial with it is installed. The inner wall of the guide ring is fixedly connected to the inner wall of the base cylinder through a crossbeam to realize the rotational installation of the transmission ring.

[0017] Furthermore, the bottom end face of the transmission ring is provided with a planar thread, and an external gear ring is coaxially fixed on the outer side. The external gear ring meshes with the drive gear driven by the motor installed on the outer wall of the base cylinder. Several L-shaped support beams are fixed on the top end face of the transmission ring. All support beams are arranged in a ring array around the center of the transmission ring. An arc-shaped groove is provided on the upper surface of the free end of each support beam. A sliding ring is rotatably installed in the arc-shaped groove. The sliding ring is coaxially fixed on the bottom end face of a power gear. A power motor is also installed on one of the support beams. The second transmission gear driven by the power motor meshes with the power gear.

[0018] Furthermore, the cable winding device is installed on the top surface of the power gear; one section of the central arm and the hinged arm is a telescopic rod section with adjustable length, and the other section of the central arm is a screw section with a strip keyway along its length on its surface. A transmission key is fixed to the wall of the shaft hole of the power gear, and the transmission key is slidably installed in the strip groove. The screw section can freely pass through the shaft hole axially. The power gear is fixed by a pair of fastening nuts threaded onto the screw section.

[0019] The beneficial effects of this invention are as follows: This is an auxiliary system for repairing cracks in the inner shell of a gasifier. It is installed in the inner shell of the gasifier using a simple mounting arm. In use, the mounting arm, consisting of a central arm and a hinged arm, is directly inserted into the appropriate depth within the inner shell. Then, the cable winding device is activated, pulling the steel cable upwards. This causes the hinged arm to automatically rotate upwards to a radial position within the inner shell and remain fixed. This allows the grinding wheel to make good tangential contact with the inner wall of the gasifier, grinding away internal reaction residues or rust, exposing the inner wall of the gasifier. A monitoring system allows online monitoring of the inner wall for cracks. Cracks can be further ground to check their depth. Simultaneously, post-grinding welding repairs are facilitated by dissolving welding material into the ground area or the subsequently processed weld bevel for auxiliary repair. Moreover, the aforementioned articulated arm design facilitates the placement of grinding equipment and other equipment into the gasifier's inner shell in one go, avoiding the constraints of the relatively small opening at the top of the gasifier's inner shell. After the entire mounting arm is quickly inserted into the gasifier's inner shell in a straight rod shape, it can be manipulated by a steel cable to change it into a right angle shape, thus avoiding the problem of not being able to enter the gasifier's inner shell when directly inserted in a working posture.

[0020] Furthermore, this invention also incorporates a specialized positioning component to ensure that the central arm can be coaxially installed within the gasifier's inner shell. This ensures that the grinding wheel of the grinding equipment can make tangential rolling contact with the inner wall of the gasifier's inner shell. Simultaneously, when the central arm is driven to rotate, it carries the rotating grinding wheel in a circular motion along the inner wall of the gasifier's inner shell, uniformly and efficiently grinding its inner surface for subsequent precise repair. This process removes reaction residues or rust and other foreign matter adhering to the inner surface, thus fully exposing any existing cracks on the inner surface of the gasifier's inner shell. This avoids problems where cracks are concealed by surface-adhered foreign matter, preventing misjudgments that the gasifier's inner shell is cracked due to cracks in the foreign matter adhesion layer.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the invention during installation and use; Figure 2 for Figure 1 The diagram shown is a schematic of the structure after all support beams and mounting arms have been removed. Figure 3 for Figure 2 Top view of the structure shown; Figure 4 for Figure 3 An enlarged view of the positioning components; Figure 5 for Figure 4 A rotated sectional view along the AA direction; Figure 6 This is a diagram showing the installation structure between the mounting arm and the positioning assembly; Figure 7 This is a structural diagram of the grinding equipment; Figure 8 for Figure 1 Enlarged view of the structure at point B.

[0023] In the diagram: 1. Gasifier inner shell; 2. Grinding equipment; 201. Mounting frame; 202. Drive motor; 203. Grinding wheel; 204. First transmission gear; 3. Center arm; 3. Screw section; 301. Telescopic rod section; 302. Hinge arm; 4. Wireless camera; 5. Connecting ring; 6. Steel cable; 7. Limiting component; 8. Sliding beam; 9. Cross-connecting beam; 10. Guide ring; 11. Transmission ring; 12. External gear ring; 13. Drive gear; 14. Radial beam; 15. Motor; 16. Base cylinder; 17. Block part; 18. Support beam; 19. Sliding ring; 20. Power gear; 21. Fastening nut; 22. Cable winding equipment; 23. Power motor; 24. Second transmission gear; 25. Fixed pulley; 26. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] Please see Figure 1This invention provides a technical solution: an auxiliary system for repairing cracks in the inner shell of a gasifier. In terms of its components, it includes a remotely operable grinding device 2 and a real-time monitoring system for observing the grinding process. This real-time monitoring system includes at least one wireless camera 5. The grinding device 2 and the wireless camera 5 are mounted on a mounting arm. The mounting arm is inserted into the inner shell 1 of the gasifier to perform pre-repair grinding, removing any adhering residue from the inner surface of the shell to clearly observe whether cracks exist. Specifically, as... Figure 1 As shown, this mounting arm includes a central arm 3 and a hinged arm 4 hinged to the bottom end of the central arm 3. The central arm 3 is hollow, and a limit member 8 is fixed on its side wall near the bottom end to limit the extreme positions of the hinged arm 4's rotation. The hinged arm 4 is then mounted as shown... Figure 1 The hinged arm 4 is hinged at one end to the bottom of the central arm 3, and a grinding device 2 is installed at the other end. Under normal conditions, when the mounting arm is placed into the inner shell 1 of the gasifier, the hinged arm 4 hangs freely due to its own weight, aligned vertically with the central arm 3. During installation, a wireless camera 5 and a connecting ring 6 are also installed on the hinged arm 4. This connecting ring 6 is connected to one end of a steel cable 7. The other end of the steel cable 7 freely passes into the central arm 3, passes around several fixed pulleys 26 rotatably installed inside the central arm 3, and then extends upwards out of the top of the central arm 3 to connect to a cable winding device 23 that can hold the steel cable 7. When the cable winding device 23 is activated, it pulls the steel cable 7 upwards, causing the hinged arm 4, which is normally collinear with the cantilever, to rotate upwards. When in contact with the limiting member 8, it is perpendicular to the central arm 3. Therefore, when the central arm 3 is coaxially set on the axial direction of the inner shell 1 of the gasifier, the hinge arm 4 can be arranged radially. This facilitates the grinding wheel 203 of the grinding equipment 2 to grind away the deposits on the inner wall of the shell when it rotates. It can also rotate around the inner circumference of the shell, ensuring that the roller can roll tangentially with the inner wall of the shell, gradually and evenly grinding, avoiding uneven wear that would cause the metal body of the shell to have pits when the deposited layer is ground off. During manufacturing, if Figure 1 As shown, the limiting component 8 specifically includes a right-angled bent rod, with a limiting block fixed at the bottom end of the bent rod. The limiting block contacts the hinged arm 4 and limits its movement.

[0028] like Figure 8 As shown, a through hole is provided on the side wall of the central arm 3. After the steel cable 7 passes around a fixed pulley 26 on the hinged arm 4, it freely passes through the through hole and is wound in an S-shape around a pair of vertically arranged fixed pulleys 26. This pair of fixed pulleys 26 can be installed inside the central arm 3. In use, initially, when the mounting arm is inserted, the hinged arm 4 hangs freely, and the steel cable 7 is released. When it is placed in the corresponding position in the inner shell 1 of the gasifier, the cable winding device 23 winds the steel cable 7 upward and stores it until the aforementioned limiting member 8 contacts the hinged arm 4, and the two are perpendicular to each other, then it rotates to the limit, which is the working position.

[0029] In this embodiment, as Figure 1 and Figure 7 As shown, the grinding device 2 includes a mounting frame 201, a grinding wheel 203, and a drive motor 202. The mounting frame 201 is a channel steel structure with its open side facing the side wall of the gasifier inner shell 1. The drive motor 202 and the grinding wheel 203 are sequentially mounted inside the mounting frame 201. The spindle of the drive motor 202 and the spindle of the grinding wheel 203 each protrude from one end of the mounting frame 201 and are each fixed with a first transmission gear 204. When the two first transmission gears 204 mesh, the drive motor 202 starts, enabling the grinding wheel 203 to rotate. The axial direction of the grinding wheel 203 is parallel to the axial direction of the gasifier inner shell 1, so that it rolls tangentially with the side wall of the gasifier inner shell 1 for grinding. In the above embodiment, the drive motor 202 can be a remotely controllable motor, so that when the wireless camera 5 of the monitoring system detects that the grinding device 2 is in contact with the corresponding inner wall of the gasifier inner shell 1, the drive motor 202 can be started for real-time grinding. Therefore, in practice, the wireless camera 5 can be hinged and mounted above the hinged arm 4 to adjust the monitoring direction, making it convenient for the operator to remotely control and monitor the grinding progress from outside the gasifier. The aforementioned cable winding device 23 can generally be driven by a motor to form an electric hoist structure together with the steel cable 7, similar to the principle of a winch.

[0030] In all the above embodiments, in order to ensure that the articulated arm 4 can be arranged radially along the inner shell 1 of the gasifier, and that the grinding wheel 203 can rotate circumferentially along the inner wall of the inner shell 1 of the gasifier when the central arm 3 rotates, so as to achieve full or partial grinding in the circumferential direction, this embodiment specifically mounts the central arm 3 rotatably on a positioning component. This positioning component makes the central arm 3 coaxially located in the inner shell 1 of the gasifier, and the cable winding device 23 can also be mounted on the positioning component.

[0031] Specifically, in this embodiment, as Figures 2-6As shown, the aforementioned positioning component includes a cylindrical base cylinder 17. The bottom end face of the base cylinder 17 is required to slide in contact with the inner shell 1 of the gasifier, allowing the base cylinder 17 to slide relative to the outer surface of the gasifier. Alternatively, when the inner shell 1 of the gasifier is exposed during maintenance and disassembly, it can be directly installed in sliding contact with the surface of the inner shell 1. Or, in practice, when part of the inner shell 1 of the gasifier is exposed at its top neck, it can be directly fitted onto the exposed portion. The specific installation position can be selected according to the actual scenario. More specifically, the top of the base cylinder 17 has a ring array of radial beams 15, and each radial beam 15 has a sliding beam 9 slidably mounted on its surface. The sliding direction of the sliding beam 9 is along the radial direction of the base cylinder 17. Furthermore, a planar thread is provided on the upper surface of the sliding beam 9, allowing transmission between it and a transmission ring 12 that contacts and engages with its upper surface in the form of a planar thread pair, so that all sliding beams 9 slide along their respective radial beams 15. When all the sliding beams 9 are in contact with the top side wall of the gasifier inner shell 1, the base cylinder 17 is naturally centered on the top outer side of the gasifier inner shell 1. During manufacturing, in order to better contact the gasifier, a patch 18 can be provided at the end of the sliding beam 9 to better contact the gasifier inner shell 1 and improve the tightness and reliability of the connection.

[0032] For the rotational installation of the transmission ring 12, it can be as follows: Figures 4-6 As shown, an annular guide groove is provided on the inner side of the transmission ring 12, and a guide ring 11 is coaxially installed in this annular guide groove, so that the transmission ring 12 can rotate coaxially around the guide ring 11. The inner wall of the guide ring 11 is fixedly connected to the inner wall of the base cylinder 17 through several cross beams 10 in the shape of [], so as to realize the fixed installation of the guide ring 11 and thus realize the rotational installation of the transmission ring 12.

[0033] In this embodiment, as Figures 4-6 A planar thread is provided on the bottom end face of the transmission ring 12, and an external gear ring 13 is coaxially fixed on its outer side. The external gear ring 13 meshes with the drive gear 14 driven by the motor 16 mounted on the outer wall of the base cylinder 17. When the motor 16 starts, the external gear ring 13 and the transmission ring 12 rotate together, thereby driving all the sliding beams 9 to move. At the same time, it is also necessary to... Figure 6As shown, several L-shaped support beams 19 are fixed on the top surface of the transmission ring 12. All support beams 19 are arranged in a ring around the center of the transmission ring 12. An arc-shaped groove is provided on the upper surface of the free end of each support beam 19. A sliding ring 20 is rotatably mounted coaxially in these arc-shaped grooves. The sliding ring 20 is coaxially fixed on the bottom end surface of a power gear 21. A power motor 24 is also mounted on one of the support beams 19. The second transmission gear 25 driven by the power motor 24 meshes with the power gear 21. When the power motor 24 is started, the power gear 21 rotates on a bracket formed by all the support beams 19, and then rotates the central arm 3, that is, rotates the mounting arm, so that the grinding wheel 203 can make corresponding circular motion.

[0034] In this embodiment, the cable winding device 23 can be installed on the top surface of the power gear 21 to drive the steel cable 7. To facilitate auxiliary repair of defects at different depths in the inner shell 1 of the gasifier, one section of the central arm 3 and the hinged arm 4 is made into a telescopic rod section 302 with adjustable length, while the other section of the central arm 3 is made into a screw section 301. The surface of the screw section 301 is provided with a strip-shaped keyway along the length direction, and a transmission key is fixed to the hole wall of the shaft hole of the power gear 21. The transmission key is slidably installed in the strip-shaped keyway to guide the power gear 21 to move vertically to the corresponding position on the central arm 3, and is fixed by a pair of fastening nuts 22 threaded onto the screw section 301, so that the grinding device 2 can be located at the corresponding depth of the inner shell 1 of the gasifier for repair and grinding operations. Since the drive gear 21 needs to move along the central arm 3 and also needs to be connected to the drive gear 21, the screw section 301 can freely pass through the shaft hole axially, but cannot be threaded. That is, it is advisable that the central hole of the drive gear 21 is a smooth hole with an inner diameter larger than the outer diameter of the screw section 301.

[0035] In the above description of the present invention, it should be noted that the terms "one side," "the other side," 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 in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not 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 the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A repair and maintenance auxiliary system for cracks in the inner shell of a gasifier, comprising a remotely operable grinding device (2) and a real-time monitoring system for viewing the grinding process, the real-time monitoring system including at least one wireless camera (5), the grinding device (2) and the wireless camera (5) being mounted on a mounting arm, characterized in that: The mounting arm includes a central arm (3) and a hinged arm (4) hinged to the bottom end of the central arm (3). The central arm (3) is hollow and a limiting member (8) is fixed on the side wall near the bottom end. One end of the hinged arm (4) is hinged to the bottom end of the central arm (3), and the other end is equipped with the grinding device (2). The wireless camera (5) and a connecting ring (6) are also installed on the hinged arm (4). The connecting ring (6) is connected to one end of a steel cable (7). The other end of the steel cable (7) is freely inserted into the central arm (3), and after passing around the fixed pulley (26) rotatably installed inside the central arm (3), it is led out of the top of the central arm (3) to connect with a cable winding device (23). When the cable winding device (23) is started, the steel cable (7) is pulled upward, so that the hinge arm (4) which is collinear with the cantilever under normal conditions rotates upward and is perpendicular to the central arm (3) when it contacts the limiting member (8).

2. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 1, characterized in that: The limiting member (8) includes a right-angled bent rod with a limiting block fixed at the bottom end of the bent rod. The limiting block contacts the hinged arm (4) and limits its movement.

3. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 1, characterized in that: A through hole is provided on the side wall of the central arm (3). After the steel cable (7) passes freely through the through hole, it is wound in an S-shape around a pair of fixed pulleys (26) arranged vertically.

4. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 1, characterized in that: The grinding equipment (2) includes a mounting frame (201), a grinding wheel (203), and a drive motor (202). The mounting frame (201) is a channel steel structure, and the drive motor (202) and the grinding wheel (203) are installed inside it in sequence. The main shaft of the drive motor (202) and the spindle of the grinding wheel (203) are both exposed at one end of the mounting frame (201), and a first transmission gear (204) is fixed thereon. The two first transmission gears (204) mesh to realize the rotation of the grinding wheel (203), and the axial direction of the grinding wheel (203) is parallel to the axial direction of the inner shell (1) of the gasifier.

5. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 1, characterized in that: The wireless camera (5) is hinged above the hinged arm (4) to adjust the monitoring direction; the cable winding device (23) is driven by a motor to form the structure of an electric hoist together with the steel cable (7).

6. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 1, characterized in that: The central arm (3) is rotatably mounted on a positioning assembly, and the central arm (3) is coaxially located in the inner shell (1) of the gasifier. The cable winding device (23) is also mounted on the positioning assembly.

7. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 6, characterized in that: The positioning component includes a base cylinder (17), the bottom end face of which is in sliding contact with the inner shell (1) of the gasifier. The top end of the base cylinder (17) has a number of radial beams (15) arranged in a ring. Each radial beam (15) has a sliding beam (9) slidably installed on its surface. The sliding direction of the sliding beam (9) is set radially along the base cylinder (17). The upper surface of the sliding beam (9) is provided with a planar thread, and a transmission ring (12) that contacts and cooperates with its upper surface is driven in the form of a planar thread pair. When all the sliding beams (9) are in contact with the top side wall of the inner shell (1) of the gasifier, the base cylinder (17) is centrally located on the outer side of the top end of the inner shell (1) of the gasifier.

8. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 7, characterized in that: The inner side of the transmission ring (12) is provided with an annular guide groove, and a guide ring (11) coaxial with it is installed. The inner wall of the guide ring (11) is fixedly connected to the inner wall of the base cylinder (17) through the cross beam (10) to realize the rotational installation of the transmission ring (12).

9. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 8, characterized in that: The bottom end face of the transmission ring (12) is provided with a planar thread, and an external gear ring (13) is coaxially fixed on the outer side. The external gear ring (13) meshes with the drive gear (14) driven by the motor (16) installed on the outer wall of the base cylinder (17). Several L-shaped support beams (19) are fixed on the top surface of the transmission ring (12). All support beams (19) are arranged in a ring array around the center of the transmission ring (12). An arc-shaped groove is provided on the upper surface of the free end of each support beam (19). A sliding ring (20) is rotatably installed in the arc-shaped groove. The sliding ring (20) is coaxially fixed on the bottom end face of a power gear (21). A power motor (24) is also installed on one of the support beams (19). The second transmission gear (25) driven by the power motor (24) meshes with the power gear (21).

10. The auxiliary system for repairing and maintaining cracks in the inner shell of a gasifier according to claim 9, characterized in that: The cable winding device (23) is installed on the top surface of the power gear (21); one section of the central arm (3) and the hinged arm (4) is a telescopic rod section (302) with adjustable length, and the other section of the central arm (3) is a screw section (301) with a strip keyway along its length. The shaft hole of the power gear (21) is fixed with a transmission key, which is slidably installed in the strip groove. The screw section (301) can freely pass through the shaft hole axially. The power gear (21) is fixed by a pair of fastening nuts (22) threaded onto the screw section (301).

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