Laser cladding repairing device and method for follow-up atmosphere protection large slewing bearing

Abstract

The invention relates to the technical field of laser, in particular to a follow-up atmosphere protection large slewing bearing laser cladding repairing device and method.The device comprises a large slewing bearing, a laser cladding system, an X-Z-axis two-dimensional motion platform, a follow-up inert atmosphere chamber, a C-axis rotating table, an atmosphere control system and a master control system. According to the invention, the cladding head is driven to generate relative motion in the vertical direction and the horizontal direction by virtue of the X-Z-axis two-dimensional motion platform, and the inert atmosphere chamber and the cladding head are driven to move in the circumferential direction of the slewing bearing subjected to additive machining by virtue of the C-axis rotating table, so that continuous machining of laser cladding additive manufacturing and remanufacturing of the large rotary structural member is realized. The follow-up inert atmosphere chamber is small in volume, short in inflation and deflation time and high in efficiency. And the cladding head is provided with double hammering units, so that hot metal which is just deposited can be hammered synchronously, and cladding processing and processing post-processing can be carried out synchronously.

Description

Technical Field

[0001] The invention belongs to the field of laser technology, and in particular relates to a laser cladding repair device and method for a large slewing bearing protected by a dynamic atmosphere. Background Art

[0002] With the rapid development of the industrial manufacturing system, the application demand for large slewing bearings is increasing. The raceways of slewing bearings are prone to fatigue wear, corrosion and other defects after long-term load operation, which reduces the stability of the bearings. As the main load-bearing and moving parts of heavy-duty equipment, large slewing bearings have complex processing procedures and high manufacturing costs. It is particularly important to repair failed bearing raceways, improve their wear resistance, fatigue strength and corrosion resistance, and restore their performance. As an efficient processing method, laser cladding deposition technology has the characteristics of low cost, high timeliness, and green environmental protection, and can quickly restore the dimensions and performance of the repaired parts.

[0003] Since oxygen, hydrogen, etc. in the atmosphere are easily combined with the high-temperature metal of the cladding layer, affecting the microstructure and macroscopic mechanical properties of the cladding layer, the cladding head motion mechanism of the laser cladding deposition manufacturing equipment is usually installed inside an inert atmosphere chamber.

[0004] At present, in conventional laser cladding deposition manufacturing equipment, the motion mechanism of the additive cladding head is installed inside the inert atmosphere chamber. The inert atmosphere chamber is fixedly installed, and there is no relative movement between the inert atmosphere chamber and the processed parts. Usually, in order to meet the processing of various types of parts, the volume of the inert atmosphere chamber is large, resulting in a long time for the atmosphere chamber to be evacuated and filled, and the preparatory time for additive processing is much longer than the additive cladding processing time. When the size of a large bearing is larger than the size of the inert atmosphere chamber or the size of the processed area is larger than the size of the inert atmosphere chamber, conventional laser cladding deposition manufacturing equipment cannot meet its continuous cladding processing in an inert atmosphere environment. Summary of the invention

[0005] In order to solve the problems of long inflation cycle of the inert atmosphere chamber and inability to meet the continuous additive processing of large rotating parts in an inert atmosphere environment during the above-mentioned laser cladding deposition repair, the present invention has developed a laser cladding repair device for large slewing bearings with follower atmosphere protection. Through the "small volume" and "follow-up" methods, the laser cladding deposition manufacturing technology is used to achieve continuous, efficient and reliable processing of large rotating structural parts repair process.

[0006] The specific technical solution adopted by the present invention is:

[0007] The laser cladding repair device for large slewing bearings protected by a follow-up atmosphere comprises a large slewing bearing, a laser cladding system, an XZ axis two-dimensional motion platform, a C axis rotary table, a follow-up inert atmosphere chamber, an atmosphere control system and a master control system, and is characterized in that the large slewing bearing, the cladding end assembly and the follow-up inert atmosphere chamber form a relative rotation, a partial area of ​​the large slewing bearing is rotated into the follow-up inert atmosphere chamber, and the laser cladding system, the XZ axis two-dimensional motion platform and the C axis rotary table are used to perform laser cladding repair on the large slewing bearing isolated in the follow-up inert atmosphere chamber.

[0008] The cladding end assembly and the follow-up inert atmosphere chamber in the laser cladding system are moved by means of an XZ-axis two-dimensional motion platform. The follow-up inert atmosphere chamber is fixedly connected to the X-axis base of the XZ-axis two-dimensional motion platform. The cladding end assembly is installed on the Z-direction slide of the XZ-axis two-dimensional motion platform. The X-direction motion axis drives the cladding end assembly to move in the horizontal direction, the Z-direction motion axis drives the cladding end assembly to move in the vertical direction, and the rotating table drives the mobile atmosphere chamber and the cladding end assembly to move along the circumferential direction of the bearing.

[0009] Furthermore, the dynamic inert atmosphere chamber has a split structure, which includes a main box body, a split cover plate located on the left and right sides, a three-dimensional sealing cover located on the rear side and a front cover on the front side, and a top cover and a gas detector located on the upper side. The split cover plate, three-dimensional sealing cover, front cover and top cover are all fixed to the main box body with bolts and spliced ​​into a hexahedron. The dynamic inert atmosphere chamber monitors the gas composition in the chamber with the help of a gas detector.

[0010] Furthermore, the three-dimensional sealing cover of the follow-up inert atmosphere chamber is buckled onto the Z-direction slide to form a seal, and together with the follow-up inert atmosphere chamber and the large slewing support bearing, forms a three-dimensional dynamic atmosphere isolation chamber.

[0011] Furthermore, the split cover plate includes a left-side split cover plate and a right-side split cover plate, the left-side split cover plate and the right-side split cover plate are mirror-symmetrical, and the left-side split cover plate and the right-side split cover plate both include a first side cover plate, a second side cover plate, a static sealing strip and a dynamic sealing strip, the first side cover plate is a rectangular plate structure, the second side cover plate is a U-shaped plate structure, the U-shaped opening of the second side cover plate faces the first side cover plate and is spliced ​​to form a bearing channel of the dynamic inert atmosphere chamber, a static sealing strip is provided at the junction of the first side cover plate and the second side cover plate, and a dynamic sealing strip is provided around the bearing channel.

[0012] Furthermore, the laser cladding system includes a laser, a multi-channel powder feeder, a cladding end assembly, a protective gas storage tank and a water cooling device. The cladding end assembly includes a mounting plate and a cladding head and a hammer unit located on the mounting plate. The hammer unit is symmetrically arranged on the upper and lower sides of the cladding head. The hammer unit includes a hammer body and a hammer drive device. The hammer body has the freedom of reciprocating linear motion with the help of the hammer drive device and hammers the cladding layer.

[0013] A repair method for a large slewing bearing laser cladding repair device protected by a dynamic atmosphere, the repair method specifically comprising the following steps:

[0014] S1. Hoist the large slewing bearing to be repaired to the designated installation location, grind the surface of the area to be repaired of the large slewing bearing to remove the rust and scale on the surface, then rinse with alcohol and dry;

[0015] S2. Install a dynamic inert atmosphere chamber to establish an independent atmosphere environment space for the local area of ​​the large slewing bearing;

[0016] S3, extracting the air in the moving inert atmosphere chamber, and then transporting the inert gas into the moving inert atmosphere chamber;

[0017] S4, after the gas in the follow-up inert atmosphere chamber is replaced with inert gas, the laser cladding mechanism is started to repair the area to be repaired of the large slewing bearing;

[0018] S5. The laser cladding mechanism repairs the area to be repaired of the large slewing bearing in the vertical direction. After the first repair tissue is clad, the C-axis rotary table is driven to rotate, and the cladding end assembly and the follow-up inert atmosphere chamber move with the C-axis rotary table to the starting point of the next cladding position, and cladding repair is performed along the rectangular wave path until all the areas to be repaired are repaired.

[0019] The beneficial effects of the present invention are:

[0020] 1. The laser cladding repair device and method with a follow-up atmosphere protection device provided in the present invention comprehensively solve the problems of low processing efficiency, discontinuous processing, inconsistent mechanical properties of the repair layer material structure, and high brittleness in the current laser cladding directional deposition repair process of large rotating supports, creating the necessary premise for the industrialization of laser cladding deposition repair manufacturing of large rotating structural parts.

[0021] 2. The side cover of the follow-up inert atmosphere chamber in the present invention can be customized according to different bearing models, which improves the interchangeability and utilization rate of the equipment. The follow-up atmosphere chamber is small in size, which can realize rapid gas filling and discharge, and greatly improve the argon filling efficiency. The atmosphere chamber adopts a design combining a metal frame structure and an acrylic plate, which is convenient for monitoring and operation while ensuring structural strength and reusability.

[0022] 3. In the present invention, the linkage control of the C-axis rotary table, X-axis and Z-axis is used to realize the circumferential movement of the cladding end tool and the follow-up inert atmosphere chamber along the slewing bearing, meeting the continuous processing requirements of the cladding repair of the wear-resistant layer of the large slewing bearing.

[0023] 4. In the present invention, hammer units are symmetrically installed on the upper and lower sides of the cladding head, and laser additive and hammering are operated synchronously, so that laser cladding deposition processing and post-processing are carried out synchronously. The hammer unit quickly hammers the deposited hot metal, causing plastic deformation in the upper area of ​​the high-temperature cladding metal, generating compressive stress inside, reducing the brittleness of the cladding layer metal, and effectively improving the fatigue performance of the cladding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the device structure for repairing the inner ring of a large bearing;

[0025] Figure 2 It is a structural schematic diagram of an inert atmosphere chamber;

[0026] Figure 3 It is a structural schematic diagram of a split cover plate;

[0027] Figure 4 It is a structural schematic diagram of the laser cladding system;

[0028] Figure 5 It is a schematic diagram of the structure of the cladding end assembly;

[0029] Figure 6 It is a schematic diagram of the side structure of the laser cladding system;

[0030] Figure 7 This is a schematic diagram of the device structure for repairing the outer ring of a large bearing;

[0031] In the accompanying drawings, 1-1, large slewing bearing, 1-2, C-axis rotating table, 1-3, XZ-axis two-dimensional motion platform, 1-4, follow-up inert atmosphere chamber, 2-1, three-dimensional sealing cover, 2-2, split cover plate, 2-3, top cover, 2-4, main box, 2-5, gas detector, 2-6, front cover, 3-1, first side cover plate, 3-2, second side cover plate, 3-3, dynamic sealing strip, 3-4, static sealing strip, 4-1, laser, 4-2, multi-channel powder feeder, 4-3, cladding end assembly, 4-4, protective gas storage tank, 4-5, water cooling device, 5-1, hammer unit, 5-101, hammer body, 5-2, mounting plate, 5-3 cladding head, 6-1, X-axis base, 6-2, Z-direction slide plate. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] Specific embodiments, such as Figure 1-7 As shown, the present invention provides a laser cladding repair device for a large slewing bearing under dynamic atmosphere protection, comprising a large slewing bearing, a laser cladding system, an XZ axis two-dimensional motion platform, a C axis rotating table, a dynamic inert atmosphere chamber, an atmosphere control system and a master control system, characterized in that the large slewing bearing, the cladding end assembly and the dynamic inert atmosphere chamber form a relative rotation, a partial area of ​​the large slewing bearing is rotated into the dynamic inert atmosphere chamber, and the laser cladding system, the XZ axis two-dimensional motion platform and the C axis rotating table are used to perform laser cladding repair on the large slewing bearing isolated in the dynamic inert atmosphere chamber.

[0034] The follow-up inert atmosphere chamber 1-4 is fixed on the XZ axis two-dimensional motion platform 1-3. With the help of the X-axis motion axis, the follow-up inert atmosphere chamber 1-4 has the freedom to move along the radial direction of the bearing. With the help of the XZ axis two-dimensional motion platform 1-3, the cladding end component 4-3 in the laser cladding system has the freedom to move in the vertical and horizontal directions. With the help of the C-axis rotating table 1-2, the large slewing bearing 1-1 and the cladding end component 4-3 and the dynamic inert atmosphere chamber 1-4 form relative rotation, and a partial area of ​​the large slewing bearing 1-1 is rotated into the follow-up inert atmosphere chamber 1-4. The large slewing bearing 1-1 isolated in the follow-up inert atmosphere chamber 1-4 is laser clad and repaired by using the laser cladding system.

[0035] At present, in conventional laser cladding deposition manufacturing equipment, the motion mechanism of the additive cladding head is installed inside the inert atmosphere chamber. The inert atmosphere chamber is fixedly installed, and there is no relative movement between the inert atmosphere chamber and the processed parts. Usually, in order to meet the processing of various types of parts, the volume of the inert atmosphere chamber is large, resulting in a long time for the atmosphere chamber to be evacuated and filled, and the preparatory time for additive processing is much longer than the additive cladding processing time. When the size of a large bearing is larger than the size of the inert atmosphere chamber or the size of the processed area is larger than the size of the inert atmosphere chamber, conventional laser cladding deposition manufacturing equipment cannot meet its continuous cladding processing in an inert atmosphere environment.

[0036] Therefore, in the present invention, the fixed large-volume inert atmosphere chamber is designed as a follow-up small-volume inert atmosphere chamber. Through the linkage control of the C-axis rotating table 1-2 and the XZ-axis two-dimensional motion platform 1-3, the cladding end component 4-3 and the follow-up inert atmosphere chamber 1-4 are moved along the circumferential direction of the large slewing bearing 1-1, meeting the continuous processing requirements of the wear-resistant layer cladding repair of the large slewing bearing 1-1. All parts of the large slewing bearing 1-1 are rotated into the follow-up inert atmosphere chamber 1-4, so that the cladding end component 4-3 is always in the large slewing bearing 1-1 in the follow-up inert atmosphere chamber 1-4, avoiding the situation that the large slewing bearing 1-1 cannot enter the follow-up inert atmosphere chamber 1-4 due to its too large size. At the same time, since the follow-up inert atmosphere chamber 1-4 in the present invention is small in size, the filling and exhausting time of the inert gas in the follow-up inert atmosphere chamber 1-4 is short, thereby improving the working efficiency of laser cladding repair.

[0037] The atmosphere control system includes an atmosphere introduction device, a flow control device, a pressure monitoring device and control software, etc., which can accurately control the inert atmosphere in the follow-up inert atmosphere chambers 1-4.

[0038] The main control system is mainly a CPU, which controls the laser cladding system, the XZ axis two-dimensional motion platform 1-3, the atmosphere control system and the C axis rotary table 1-2, manages each subsystem and realizes automatic control.

[0039] like Figure 1 As shown, the follow-up inert atmosphere chamber 1-4 isolates the atmosphere environment in the fan-shaped area of ​​the large slewing support bearing 1-1, and can make the follow-up inert atmosphere chamber 1-4 move relatively along the circumference of the bearing through the rotation of the C-axis rotating table 1-2, so that all parts of the bearing are rotated into the follow-up inert atmosphere chamber 1-4.

[0040] like Figure 1 and Figure 2 As shown, the follow-up inert atmosphere chamber 1-4 is of a split structure, and the follow-up inert atmosphere chamber 1-4 includes a main box body 2-4, a split cover plate located on the left and right sides, a three-dimensional sealing cover 2-1 located on the rear side and a front cover 2-6 on the front side, and a top cover and a gas detector 2-5 located on the upper side. The split cover plate, the three-dimensional sealing cover 2-1, the front cover 2-6, and the top cover are all fixed to the main box body 2-4 with bolts and spliced ​​to form a hexahedron. The follow-up inert atmosphere chamber 1-4 monitors the gas composition in the chamber with the help of the gas detector 2-5.

[0041] In the present invention, the follow-up inert atmosphere chamber 1-4 adopts a metal frame structure, and a transparent acrylic panel is installed on the frame to facilitate processing and process monitoring; a sealing strip is used at the joint of the follow-up inert atmosphere chamber 1-4 to isolate the atmosphere inside and outside the atmosphere chamber; the three-dimensional sealing cover 2-1 is made of high-temperature resistant silicone material, which is resistant to high temperature and aging, and can ensure the stability of the atmosphere environment inside the atmosphere chamber under relative motion conditions.

[0042] In addition, the gas detector 2-5 on the upper side of the moving inert atmosphere chamber 1-4 is an oxygen content detection device, and the upper side and the lower side of the atmosphere chamber are respectively provided with an exhaust port and an air inlet.

[0043] like Figure 1 and Figure 6 As shown, the follow-up inert atmosphere chamber 1-4 is fixedly connected to the X-axis base 6-1 of the XZ-axis two-dimensional motion platform 1-3, and the cladding end assembly 4-3 is installed on the Z-axis slide 6-2 of the XZ-axis two-dimensional motion platform 1-3. The X-axis base 6-1 drives the follow-up inert atmosphere chamber 1-4 and the cladding end assembly 4-3 to move in the horizontal direction, and the Z-axis slide 6-2 drives the cladding end assembly 4-3 to move in the vertical direction.

[0044] like Figure 1 and Figure 2 As shown, the three-dimensional sealing cover 2-1 of the follow-up inert atmosphere chamber 1-4 is buckled to the surface of the Z-direction slide 6-2 to form a seal, and the cross section of the follow-up inert atmosphere chamber 1-4 and the large slewing bearing 1-1 together form a three-dimensional dynamic atmosphere isolation chamber.

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, the split cover plate includes a left split cover plate and a right split cover plate, and the left split cover plate and the right split cover plate are mirror-symmetrical. The left split cover plate and the right split cover plate both include a first side cover plate 3-1, a second side cover plate 3-2, a static sealing strip 3-4 and a dynamic sealing strip 3-3. The first side cover plate 3-1 is a rectangular plate structure, and the second side cover plate 3-2 is a U-shaped plate structure. The U-shaped opening of the second side cover plate 3-2 faces the first side cover plate 3-1 and is spliced ​​to form a bearing channel of the follow-up inert atmosphere chamber 1-4. A static sealing strip 3-4 is provided at the junction of the first side cover plate 3-1 and the second side cover plate 3-2, and a dynamic sealing strip 3-3 is provided around the bearing channel.

[0046] The size of the bearing channel is consistent with the cross-sectional size of the inner ring or outer ring of the bearing. According to different types of bearings, the side cover plate, dynamic sealing strip 3-3 and static sealing strip 3-4 are customized. The setting of dynamic sealing strip 3-3 and static sealing strip 3-4 can prevent the inert gas in the dynamic inert atmosphere chamber 1-4 from mixing with the outside air.

[0047] like Figure 4 and Figure 5 As shown, the laser cladding system includes a laser 4-1, a multi-channel powder feeder 4-2, a cladding end assembly 4-3, a protective gas storage tank 4-4 and a water cooling device 4-5, the cladding end assembly 4-3 includes a mounting plate 5-2 and a cladding head and a hammer unit 5-1 located on the mounting plate 5-2, the hammer unit 5-1 is symmetrically arranged on the upper and lower sides of the cladding head, the hammer unit 5-1 includes a hammer body 5-101 and a hammer driving device, the hammer body 5-101 has the freedom of reciprocating linear motion with the help of the hammer driving device and hammers the cladding layer.

[0048] In the present invention, laser additive and hammering are operated synchronously, and laser cladding deposition processing and post-processing are carried out synchronously. The hammer body 5-101 quickly hammers the deposited hot metal in the repaired area, causing plastic deformation in the upper area of ​​the high-temperature cladding metal, generating compressive stress inside, reducing the brittleness of the cladding layer metal, and effectively improving the fatigue performance of the cladding area; at the same time, high-speed hammering has an impact on the molten pool, intensifying the oscillation of the high-temperature liquid metal in the molten pool, which is conducive to the floating of pores inside the molten pool, homogenization of the composition, and dispersion distribution of the enhanced phase. At the same time, it can refine the grain size, reduce the proportion of columnar crystals, change the organizational morphology of the cladding material, and reduce the number of micro-defect crack sources.

[0049] When the laser cladding path is from top to bottom, the hammer unit 5-1 above the cladding head starts to work; when the laser cladding path is from bottom to top, the hammer unit 5-1 below the cladding head starts to work, wherein the hammer driving device can be a pulse piston rod, an eccentric vibration block or an electromagnetic vibrator, etc.

[0050] A repair method for a large slewing bearing laser cladding repair device protected by a dynamic atmosphere, the repair method specifically comprising the following steps:

[0051] S1. hoist the large slewing bearing 1-1 to be repaired to the designated installation position, grind the surface of the area to be repaired of the large slewing bearing 1-1 to remove rust and scale on the surface, and then rinse with alcohol and dry;

[0052] S2. Install the follow-up inert atmosphere chamber 1-4 to establish an independent atmosphere environment space for the local area of ​​the large slewing bearing 1-1;

[0053] S3, extracting the air in the follow-up inert atmosphere chamber 1-4, and then conveying the inert gas into the follow-up inert atmosphere chamber 1-4;

[0054] S4, after the gas in the follow-up inert atmosphere chamber 1-4 is replaced with an inert gas, the laser cladding mechanism is started to repair the area to be repaired of the large slewing bearing 1-1;

[0055] S5. The laser cladding system repairs the area to be repaired of the large slewing bearing 1-1 in the vertical direction. After the first repair tissue is clad, the C-axis rotary table 1-2 is driven to rotate, and the cladding end assembly 4-3 and the follow-up inert atmosphere chamber 1-4 move with the C-axis rotary table 1-2 to the starting point of the next cladding position, and perform cladding repair along the rectangular wave path until all the areas to be repaired are repaired.

[0056] When the outer raceway surface of the inner ring of the large slewing bearing 1-1 needs to be repaired, such as Figure 7 As shown, the large slewing bearing 1-1 is coaxially clamped with the C-axis rotating table 1-2, and the large slewing bearing 1-1 has the freedom of rotation. The laser cladding system is located on the outside of the large slewing bearing 1-1. By driving the X-axis base 6-1 of the XZ-axis two-dimensional motion platform 1-3 to move, the bearing channel of the mobile atmosphere chamber side cover 2-2 is customized according to the bearing size to meet the laser cladding deposition manufacturing of slewing bearings of different models and sizes. During the repair process, the Z-direction slide 6-2 of the XZ-axis two-dimensional motion platform 1-3 is used, and the laser cladding system repairs the area to be repaired of the large slewing bearing 1-1 from top to bottom or from bottom to top. Through the linkage of the X-axis, Z-axis and C-axis motion mechanisms, the cladding motion trajectory can be covered to achieve the laser cladding repair of the outer ring raceway surface of the large slewing bearing 1-1.

[0057] When the inner raceway surface of the outer ring of the large slewing bearing 1-1 needs to be repaired, such as Figure 1 As shown, the large slewing bearing 1-1 is coaxially arranged with the C-axis rotating table 1-2, and the large slewing bearing 1-1 is fixed and clamped by means of a fixing frame, that is, the large slewing bearing 1-1 is fixed, and the laser cladding system is installed on the C-axis rotating table 1-2 and has the freedom of rotation. At this time, the laser cladding system is located on the inner ring of the large slewing bearing 1-1 and faces the inner raceway surface of the large slewing bearing 1-1.

Claims

1. A laser cladding repair device for a large slewing bearing protected by a follow-up atmosphere, comprising a large slewing bearing (1-1), a laser cladding system, an XZ axis two-dimensional motion platform (1-3), a C axis rotating table (1-2), a follow-up inert atmosphere chamber (1-4), an atmosphere control system and a master control system, characterized in that: The large slewing bearing (1-1) forms relative rotation with the cladding end assembly (4-3) and the follow-up inert atmosphere chamber (1-4), and a partial area of ​​the large slewing bearing (1-1) is rotated into the follow-up inert atmosphere chamber (1-4). The large slewing bearing (1-1) isolated in the follow-up inert atmosphere chamber (1-4) is laser clad and repaired by using a laser cladding system, an XZ axis two-dimensional motion platform (1-3) and a C axis rotating table (1-2).

2. The follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 1 is characterized by: The cladding end assembly (4-3) and the follow-up inert atmosphere chamber (1-4) in the laser cladding system are moved by means of an XZ-axis two-dimensional motion platform (1-3) and a C-axis rotary table (1-2); the follow-up inert atmosphere chamber (1-4) is fixedly connected to an X-axis base (6-1) of the XZ-axis two-dimensional motion platform (1-3); the cladding end assembly (4-3) is installed on a Z-direction slide (6-2) of the XZ-axis two-dimensional motion platform (1-3); the X-direction motion axis drives the cladding end assembly (4-3) to move in a horizontal direction; the Z-direction motion axis drives the cladding end assembly (4-3) to move in a vertical direction; and the C-axis rotary table (1-2) drives the movable atmosphere chamber and the cladding end assembly to move in a bearing circumferential direction.

3. The follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 2 is characterized by: The follow-up inert atmosphere chamber (1-4) is of a split structure, comprising a main box body (2-4), split cover plates (2-2) located on the left and right sides, a three-dimensional sealing cover (2-1) located on the rear side, a front cover (2-6) on the front side, and a top cover (2-3) and a gas detector (2-5) located on the upper side. The split cover plate (2-2), the three-dimensional sealing cover (2-1), the front cover (2-6), and the top cover (2-3) are all fixed to the main box body (2-4) by bolts and spliced ​​to form a hexahedron. The follow-up inert atmosphere chamber (1-4) monitors the gas composition in the chamber by means of the gas detector (2-5).

4. The follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 3 is characterized by: The three-dimensional sealing cover (2-1) of the follow-up inert atmosphere chamber (1-4) is buckled onto the surface of the Z-direction slide plate (6-2) to form a seal, and the cross section of the follow-up inert atmosphere chamber (1-4) and the large slewing bearing (1-1) together form a three-dimensional dynamic atmosphere isolation chamber.

5. The follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 3 is characterized by: The split cover plate (2-2) comprises a left side split cover plate and a right side split cover plate, the left side split cover plate and the right side split cover plate are mirror-symmetrical, the left side split cover plate and the right side split cover plate both comprise a first side cover plate (3-1), a second side cover plate (3-4), a static sealing strip (3-2) and a dynamic sealing strip (3-3), the first side cover plate (3-1) is a rectangular plate-shaped structure, the second side cover plate (3-4) is a U-shaped plate-shaped structure, the U-shaped opening of the second side cover plate (3-4) faces the first side cover plate (3-1) and is spliced ​​to form a bearing channel of the follow-up inert atmosphere chamber (1-4), a static sealing strip (3-2) is provided at the junction of the first side cover plate (3-1) and the second side cover plate (3-4), a dynamic sealing strip (3-3) is provided around the bearing channel, and the size of the bearing channel can be customized according to large slewing bearings of different specifications, so as to meet the requirements of laser cladding repair of large slewing bearings of various models.

6. The follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 1 is characterized by: The laser cladding system comprises a laser (4-1), a multi-channel powder feeder (4-2), a cladding end assembly (4-3), a protective gas storage tank (4-4) and a water cooling device (4-5); the cladding end assembly (4-3) comprises a mounting plate (5-2) and a cladding head (5-3) and a hammer unit (5-1) located on the mounting plate (5-2); the hammer unit (5-1) is symmetrically arranged on the upper and lower sides of the cladding head (5-3); the hammer unit (5-1) comprises a hammer body (5-101) and a hammer driving device; the hammer body (5-101) has the freedom of reciprocating linear motion by means of the hammer driving device and hammers the cladding layer.

7. The repair method based on the follow-up atmosphere protection large slewing bearing laser cladding repair device according to claim 1 is characterized in that: The repair method specifically comprises the following steps: S1. hoisting the large slewing bearing (1-1) to be repaired to a designated installation position, grinding the surface of the area to be repaired of the large slewing bearing (1-1) to remove rust and scale on the surface, and then washing with alcohol or acetone and drying; S2, installing a follow-up inert atmosphere chamber (1-4) to establish an independent atmosphere environment space for a local area of ​​the large slewing bearing (1-1); S3, extracting part of the air in the follow-up inert atmosphere chamber (1-4), and then transporting an inert gas into the follow-up inert atmosphere chamber (1-4); S4, after a portion of the air in the follow-up inert atmosphere chamber (1-4) is replaced, the laser cladding system is started to repair the area to be repaired of the large slewing bearing (1-1); S5. The laser cladding mechanism repairs the area to be repaired of the large slewing bearing (1-1) in the vertical direction. After the first repair tissue is clad, the C-axis rotary table (1-2) is driven to rotate, and the cladding end assembly (4-3) and the follow-up inert atmosphere chamber (1-4) move to the starting point of the next cladding position along the C-axis rotary table, and perform cladding repair along the rectangular wave path until all the areas to be repaired are repaired.

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