Device for preparing wear-resistant and corrosion-resistant coating on surface of heavy workpiece

Abstract

The invention relates to the field of material processing, and particularly discloses a heavy workpiece surface wear-resistant and corrosion-resistant coating preparation device which comprises a rotary objective table, a powder mixing and conveying device and a multi-degree-of-freedom mechanical arm. A laser cladding head is arranged at the free end of the multi-degree-of-freedom mechanical arm and connected to the output end of the powder mixing and conveying device. The rotary objective table comprises an objective table base, a supporting platform, a jacking mechanism, a lifting mechanism, a rotary table and a rotary driving mechanism. The multi-degree-of-freedom mechanical arm is matched with the rotary objective table, laser cladding operation is carried out on a workpiece, and the flexibility is high; compared with a jacking device driven by air pressure or hydraulic pressure, the rotary objective table is better in stability and more suitable for bearing heavy workpieces.

Description

Technical Field

[0001] The present application relates to the field of material processing, and in particular to a device for preparing a wear-resistant and corrosion-resistant coating on the surface of a heavy workpiece. Background Art

[0002] Laser cladding technology has important application value in the preparation of wear-resistant and corrosion-resistant coatings on the surfaces of heavy workpieces (such as ship shafting, energy equipment components, and heavy machinery parts) due to its advantages such as low heat input, high bonding strength, and wide material applicability. However, existing technologies still have technical bottlenecks in actual industrial applications: (1) Insufficient operational flexibility: Traditional cladding equipment mostly adopts a gantry or fixed base structure with limited freedom of movement, making it difficult to adapt to the precise cladding of complex curved surfaces of heavy workpieces (such as propeller blades and irregular surfaces of crankshafts); manual welding or segmented processing methods have problems such as low trajectory accuracy and unstable interlayer bonding quality; (2) Insufficient load stability: Heavy workpieces often weigh several tons to tens of tons, and conventional turntables or translation platforms have insufficient load capacity. They are prone to vibration caused by load eccentricity, resulting in defects such as pores and cracks in the cladding layer. Therefore, the development of a laser cladding device that combines multi-dimensional precise cladding capabilities with stable support for heavy workpieces is of great significance to improving the quality and efficiency of remanufacturing of large-scale high-end equipment. Summary of the Invention

[0003] In order to improve the problems of insufficient operational flexibility and insufficient load-bearing stability in the current apparatus for preparing wear-resistant and corrosion-resistant coatings on the surface of heavy workpieces, the present application provides an apparatus for preparing wear-resistant and corrosion-resistant coatings on the surface of heavy workpieces.

[0004] The present application provides a device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface, which adopts the following technical solutions: A device for preparing a wear-resistant and corrosion-resistant coating on the surface of a heavy workpiece, comprising a rotating stage, a powder mixing and conveying device, and a multi-degree-of-freedom robotic arm; The free end of the multi-degree-of-freedom robotic arm is provided with a laser cladding head, and the laser cladding head is connected to the output end of the powder mixing and conveying device; The rotating stage includes a stage base, a supporting platform, a lifting mechanism, a lifting mechanism, a rotating stage and a rotating drive mechanism; The support platform is arranged on the stage base for lifting, and the lifting mechanism is used to drive the support platform to rise and fall; the lifting mechanism includes a sliding member, a screw drive assembly and a cam transmission assembly, the sliding member is slidably arranged on the lower end surface of the support platform, the screw drive assembly is used to drive the sliding member to slide in the horizontal direction, and the cam transmission assembly is used to convert the movement of the sliding member in the horizontal direction into the movement of the support platform in the vertical direction; The lifting mechanism is used to support the support platform during the process of the support platform being raised or lowered; The rotating platform is rotatably disposed on the supporting platform, and the rotating driving mechanism is used to drive the rotating platform to rotate.

[0005] This application uses a screw drive assembly and a cam transmission assembly to achieve the lifting drive of the support platform. Compared with conventional pneumatic or hydraulic lifting devices, this application has better stability and is more suitable for carrying heavy workpieces. During the lifting process of the support platform, the lifting mechanism provides stable support for the support platform. After the support platform is raised and lowered into place, the rotary drive mechanism drives the rotary table to rotate, which can achieve workpiece positioning. The powder is mixed by the powder mixing and conveying device and then output to the laser cladding head for laser cladding on the workpiece surface to prepare a wear-resistant and corrosion-resistant coating. The multi-degree-of-freedom robotic arm helps to improve operational flexibility.

[0006] Furthermore, the cam transmission assembly includes two oppositely arranged guide plates fixedly arranged on the worktable base, and guide grooves are respectively provided on opposite sides of the two guide plates, and the guide grooves are provided with an inclined section; the sliding member includes a horizontally arranged roller shaft and rollers rotatably arranged at both ends of the roller shaft, and each of the rollers is slidably arranged in the corresponding guide groove.

[0007] Furthermore, the screw drive assembly includes a screw rotatably arranged on the lower end surface of the support platform and a first driving member for driving the screw to rotate, the screw is threadedly connected to a threaded slider, and the threaded slider is fixed to the roller shaft.

[0008] Furthermore, a slide rail is fixedly provided on the lower end surface of the support platform, the slide rail is parallel to the lead screw, the threaded slider is fixedly connected to a connecting seat, a sliding part is provided on one side of the connecting seat, and the sliding part is slidably provided on the slide rail.

[0009] The first driving member drives the lead screw to rotate, so that the threaded slider moves along the lead screw, and the roller shaft and the threaded slider move synchronously, so that the roller slides along the corresponding guide groove. The inclined section of the guide groove can convert the horizontal movement of the threaded slider into the vertical movement of the guide plate, thereby adjusting the distance between the support platform and the base, and realizing the lifting and lowering of the support platform on the base; compared with pneumatic or hydraulic drive, the lead screw drive method of this application has better stability.

[0010] Furthermore, the lifting mechanism includes a plurality of support arms hinged on the loading platform base, and the plurality of support arms are arranged at intervals along the circumference of the loading platform base; one end of the support arm is supported on the lower end surface of the support platform, and the other end of the support arm is hinged to an adjustment arm, and the end of the adjustment arm away from the support arm is hinged to the loading platform base.

[0011] Furthermore, one end of the support arm away from the adjustment arm is rotatably connected to a roller, and a plurality of radial guide rails are fixedly provided on the lower end surface of the support platform along its own radial direction, and the rollers are slidably provided in the corresponding radial guide rails.

[0012] When the support platform is raised or lowered, the distance between the support platform and the base changes. During this process, the support arm and the adjustment arm undergo adaptive angle changes. At the same time, the roller slides along the radial guide rail. Multiple support arms provide support for the support platform to ensure the stability of the support platform during the lifting process.

[0013] Furthermore, a first fixing seat is fixedly provided on the support platform, and the rotation drive mechanism includes a drive shaft rotatably provided on the first fixing seat, an angle bracket is slidably provided on the drive shaft along its length direction, and a first bevel gear and a second bevel gear that are meshed with each other are rotatably connected to the angle bracket, and the first bevel gear is connected to the drive shaft via a spline; The rotary drive mechanism also includes a planetary gear transmission assembly, a second drive member and a steering buffer assembly, the input end of the planetary gear transmission assembly is connected to the second bevel gear, and the output end of the planetary gear transmission assembly is connected to the turntable; the second drive member is used to drive the drive shaft to rotate; the steering buffer assembly is used to offset the eccentricity during the rotation of the turntable.

[0014] Furthermore, the steering buffer assembly includes two buffer springs sleeved on the drive shaft, and the two buffer springs are respectively located on both sides of the first bevel gear.

[0015] Furthermore, a second fixing seat is fixedly provided on the support platform, a horizontal guide rail is fixedly provided on the second fixing seat, a sliding block is fixedly connected to the angle bracket, and the sliding block is slidably provided on the horizontal guide rail.

[0016] The first bevel gear and the drive shaft are spline-connected, so that the first bevel gear can rotate synchronously with the drive shaft and the first bevel gear can slide along the drive shaft; when the second driving member drives the drive shaft to rotate, the rotary table can rotate under the drive of the first bevel gear, the second bevel gear and the planetary gear transmission assembly.

[0017] If the assembly deviation or uneven load causes the turntable to rotate eccentrically, the angle bracket can slide along the drive shaft together with the first bevel gear and the second bevel gear. During this process, the sliding block slides along the horizontal guide rail, and the two buffer springs provide elastic buffering for the sliding of the angle bracket, thereby offsetting the eccentricity of the turntable and improving the stability of the turntable rotation.

[0018] Furthermore, the powder mixing and conveying device includes a base, a powder premixing mechanism, a powder mixing mechanism and a bidirectional stirring mechanism; the powder mixing mechanism is connected to the discharge end of the powder premixing mechanism, and the powder mixing mechanism includes a rotatably arranged mixing tank, the mixing tank is cylindrical, its axis is inclined, and its rotation axis is horizontally arranged; the bidirectional stirring mechanism includes two stirring paddles rotatably arranged in the mixing tank, the two stirring paddles are coaxially arranged and their rotation directions are opposite, and the rotation axis of the stirring paddle is collinear with the axis of the mixing tank.

[0019] In conventional drum-type mixing devices, the axis of the drum coincides with the axis of rotation, and both are vertical or horizontal. The powder's motion trajectory in the drum is simple, and it only moves in a circular motion. In the present application, the mixing tank is tilted and rotates around a horizontal axis. The tilted drum wall causes the powder to be simultaneously subjected to the coupling effects of the tangential component of gravity and the radial component of centrifugal force. The motion trajectory of the powder in the tank is more complex, that is, it moves in both the axial and radial directions of the mixing tank, thereby increasing the uniformity of the mixing. The shearing and mixing effects of the bidirectional stirring mechanism further promote uniform mixing of the powder, especially for powders of different densities or particle sizes, to prevent stratification.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. The multi-degree-of-freedom robotic arm and the rotating stage are used to perform laser cladding operations on the workpiece, which is highly flexible. 2. The rotating stage uses a screw drive assembly and a cam transmission assembly to convert the horizontal movement of the sliding member into vertical movement of the support platform, thereby achieving the lifting drive of the support platform. Compared with conventional pneumatic or hydraulic lifting devices, the rotating stage provided by this application has better stability and is more suitable for carrying heavy workpieces. 3. By adopting an inclined mixing tank that rotates around a horizontal axis, the single movement trajectory of the powder in the conventional drum-type mixing device is improved, and the uniformity of the mixing is increased; at the same time, the powder mixing and conveying device can achieve the simultaneous mixing and conveying of the powder, improving the problem of the separation of the mixing and conveying processes in the traditional device, which leads to a large equipment footprint and a long process cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a schematic structural diagram of the rotating stage in an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the embodiment of the present application, mainly used to illustrate the stage base, support platform, jacking mechanism and lifting mechanism, wherein (a) is a front view and (b) is a cross-sectional view; Figure 4Figure 1 is a structural schematic diagram of a lifting mechanism mainly used for showing the embodiment of the present application, wherein (a) is a front view and (b) is a side view; Figure 5 Figure 2 is a partial structural schematic diagram of a sliding member and a screw driving assembly mainly used for showing the embodiment of the present application; Figure 6 Figure 3 is a structural schematic diagram of a lifting mechanism; Figure 7 Figure 4 is a structural schematic diagram of a rotating driving mechanism; Figure 8 Figure 5 is a structural schematic diagram of a steering buffer assembly mainly used for showing the embodiment of the present application, wherein (a) is a side view and (b) is a sectional view; Figure 9 Figure 6 is a structural schematic diagram of a planetary gear transmission assembly; Figure 10 Figure 7 is a structural schematic diagram of a powder mixing and conveying device; Figure 11 Figure 8 is a structural schematic diagram of a mixing tank mainly used for showing the embodiment of the present application; Figure 12 Figure 9 is a sectional structural schematic diagram along the line A-A in figure 8; Figure 11 Figure 13 Figure 10 is a structural schematic diagram of an annular feeding pipe and a discharging pipe mainly used for showing the embodiment of the present application; Figure 14 Figure 11 is a structural schematic diagram of a bidirectional stirring mechanism mainly used for showing the embodiment of the present application; Figure 15 Figure 12 is a structural schematic diagram of a planetary gear driving assembly mainly used for showing the embodiment of the present application, wherein (a) is an overall view and (b) is a sectional view.

[0022] Reference signs: ​1. Rotating stage; 11. Stage base; 111. Base; 112. Fixed column; 113. Support seat; 114. Support plate; 115. Connecting column; 116. Lifting column; 12. Support platform; 13. Lifting mechanism; 131. Sliding member; 1311. Connecting seat; 1312. Shaft frame; 1313. Roller shaft; 1314. Roller; 1315. Sliding part; 1316. Slide rail; 132. Screw drive assembly; 1321. Screw; 1322. Threaded slider; 1323. First driving member; 133. Cam transmission assembly; 1331. Guide plate; 1332. Guide groove; 1333. Inclined section; 134. Guide column; 135. Guide cylinder; 136. Platform connecting plate; 14. Lifting mechanism; 141. Support arm; 142. Adjusting arm; 143, roller; 144, radial guide rail; 15, rotating table; 151, supporting wheel; 152, annular guide rail; 16, rotating drive mechanism; 161, first fixed seat; 162, driving shaft; 1621, first limiting portion; 1622, second limiting portion; 163, angle bracket; 164, first bevel gear; 165, second bevel gear; 166, second driving member; 167, planetary gear transmission assembly; 1671, first inner ring gear; 1672, first planet carrier; 1673, first planetary gear; 1674, first sun gear; 1675, planetary gear top cover; 168, steering buffer assembly; 1681, first buffer spring; 1682, second buffer spring; 1683, second fixed seat; 1684, horizontal guide rail; 1685, sliding block; 2. Powder mixing and conveying device; 21. Base; 22. Powder premixing mechanism; 221. Metal powder storage tank; 222. Powder conveying device; 223. First feed pipe; 224. Pneumatic conveying and premixing device; 225. Second feed pipe; 226. Third feed pipe; 23. Powder mixing mechanism; 231. Mixing tank; 232. Feed end fixing seat; 2321. Feed port; 233. Feed pipe; 234. Annular feed pipe; 2341. Feed hole; 235 , discharge pipe; 236, first motor; 237, reduction gearbox; 24, two-way stirring mechanism; 241, input shaft; 242, first sleeve; 243, second sleeve; 244, planetary gear drive assembly; 2441, second inner ring gear; 2442, second planetary carrier; 2443, second planetary gear; 2444, second sun gear; 245, stirring paddle; 2451, stirring blade; 2452, stirring fan frame; 2453, blade holder; 246, second motor; 3. Multi-degree-of-freedom robotic arm; 31. Laser cladding head. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-15 This application is described in further detail.

[0024] The present application discloses a device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface. Figure 1 The apparatus for applying a wear-resistant and corrosion-resistant coating to a heavy workpiece includes a rotating stage 1, a powder mixing and conveying device 2, and a multi-degree-of-freedom robotic arm 3. The rotating stage 1 is used to support and position the heavy workpiece. A laser cladding head 31 is mounted at the free end of the multi-degree-of-freedom robotic arm 3, connected to the output end of the powder mixing and conveying device 2. After mixing in the powder mixing and conveying device 2, the powder is delivered to the laser cladding head 31 for laser cladding on the workpiece surface. The multi-degree-of-freedom robotic arm 3 enhances operational flexibility.

[0025] Reference Figure 2 The rotating stage 1 includes a stage base 11, a support platform 12, a lifting mechanism 13, a lifting mechanism 14, a rotating platform 15, and a rotary drive mechanism 16. The support platform 12 is mounted on the stage base 11 for lifting and lowering. The lifting mechanism 13 is used to drive the support platform 12 to rise and fall, and the lifting mechanism 14 is used to support the support platform 12 during the lifting and lowering process. The rotating platform 15 is used to carry the workpiece and is rotatably mounted on the support platform 12. The rotary drive mechanism 16 is used to drive the rotating platform 15 to rotate. Both the support platform 12 and the rotating platform 15 are disc-shaped.

[0026] When in use, the workpiece is placed on the rotating table 15, and the supporting platform 12 is first driven to rise and fall by the lifting mechanism 13. During this process, the lifting mechanism 14 provides support for the supporting platform 12. After the supporting platform 12 is raised and lowered into place, the rotating table 15 is driven to rotate by the rotating drive mechanism 16, thereby realizing the positioning of the workpiece.

[0027] Reference Figure 3 The stage base 11 includes a base 111 fixed to the ground, the base 111 is connected to a support base 113 via a plurality of vertical fixing columns 112, and a horizontal support plate 114 is fixedly provided on the top of the support base 113. The bottom of the support plate 114 is connected to a lifting column 116 via a connecting column 115.

[0028] Reference Figure 3 The lifting mechanism 13 includes a sliding member 131, a screw drive assembly 132 and a cam transmission assembly 133. The sliding member 131 is slidably arranged on the lower end surface of the support platform 12. The screw drive assembly 132 is used to drive the sliding member 131 to slide in the horizontal direction. The cam transmission assembly 133 is used to convert the horizontal movement of the sliding member 131 into the vertical movement of the support platform 12.

[0029] Specifically, refer to Figure 3 and Figure 4The cam transmission assembly 133 includes two guide plates 1331 fixedly arranged on the support plate 114 of the worktable base 11. The two guide plates 1331 are vertical and arranged opposite to each other. A guide groove 1332 is respectively provided on the opposite side of the two guide plates 1331, and the guide groove 1332 is provided with an inclined section 1333.

[0030] Reference Figure 3 The lower end surface of the supporting platform 12 is fixedly provided with a platform connecting plate 136, and the sliding member 131 is slidably provided on the lower end surface of the platform connecting plate 136. Figure 4 and Figure 5 The sliding member 131 includes a horizontally disposed roller shaft 1313 and rollers 1314 rotatably mounted at each end of the roller shaft 1313. Each roller 1314 slides within a corresponding guide slot 1332. The lead screw drive assembly 132 includes a lead screw 1321 rotatably mounted on the lower end surface of the platform connecting plate 136 and a first drive member 1323, which is a motor, for driving the lead screw 1321. The lead screw 1321 is threadedly connected to a threaded slider 1322. The bottom of the threaded slider 1322 is fixedly connected to a connecting seat 1311 and a shaft bracket 1312 in sequence. The roller shaft 1313 is rotatably mounted on the shaft bracket 1312.

[0031] Further, refer to Figure 4 (a) and Figure 5 A slide rail 1316 is fixedly provided on the lower end surface of the platform connecting plate 136 , and the slide rail 1316 is parallel to the lead screw 1321 . A sliding portion 1315 is provided on one side of the connecting seat 1311 , and the sliding portion 1315 is slidably provided on the slide rail 1316 .

[0032] The first drive member 1323 drives the lead screw 1321 to rotate, causing the threaded slider 1322 to move along the lead screw 1321. The roller shaft 1313 moves synchronously with the threaded slider 1322, causing the roller 1314 to slide along the corresponding guide groove 1332. The inclined section 1333 of the guide groove 1332 can convert the horizontal movement of the threaded slider 1322 into the vertical movement of the guide plate 1331, thereby adjusting the distance between the support platform 12 and the worktable base 11 and achieving the raising and lowering of the support platform 12 on the worktable base 11. Compared with pneumatic or hydraulic drives, the lead screw drive method of the present application has better stability and is more suitable for carrying heavy workpieces.

[0033] In order to guide the lifting and lowering of the support platform 12 in the vertical direction, refer to Figure 4 A plurality of vertical guide posts 134 are fixedly connected to the lower end surface of the platform connecting plate 136, and a guide cylinder 135 for the guide posts 134 to pass through is fixedly provided on the support plate 114 of the stage base 11. The guide cylinder 135 can be replaced by a linear bearing.

[0034] In order to provide stable support for the support platform 12 during the lifting process of the support platform 12, refer to Figure 3 and Figure 6 The lifting mechanism 14 includes a plurality of support arms 141 hingedly connected to the stage base 11. The plurality of support arms 141 are arranged at intervals along the circumference of the stage base 11. The upper ends of the support arms 141 are supported on the lower end surface of the support platform 12. The lower ends of the support arms 141 are hingedly connected to adjustment arms 142, and the lower ends of the adjustment arms 142 are hingedly connected to the stage base 11. Specifically, the middle portions of the support arms 141 are hingedly connected to the support base 113, and the lower ends of the adjustment arms 142 are hingedly connected to the side walls of the lifting columns 116.

[0035] Further, refer to Figure 3 and Figure 6 The upper end of the support arm 141 is rotatably connected to a roller 143 , and the lower end surface of the support platform 12 is fixedly provided with a plurality of radial guide rails 144 along its own radial direction, and the rollers 143 are slidably provided in the corresponding radial guide rails 144 .

[0036] When the support platform 12 is raised or lowered, the distance between the support platform 12 and the stage base 11 changes. During this process, the support arms 141 and the adjustment arms 142 undergo adaptive angle changes, while the rollers 143 slide along the corresponding radial guide rails 144. The multiple support arms 141 provide support for the support platform 12, ensuring the stability of the support platform 12 during the raising or lowering process. For example, when the support platform 12 is lowered, the distance between the support platform 12 and the stage base 11 decreases, and the multiple support arms 141 simultaneously open outward to provide support for the support platform 12. The rollers 143 slide outward along the corresponding radial guide rails 144. At the same time, the support arms 141 and the adjustment arms 142 cooperate to apply an upward force to the lifting column 116. This thrust is transmitted to the support plate 114 through the connecting column 115, providing stable support for the cam transmission assembly 133.

[0037] Reference Figure 7 and Figure 8 A first fixed seat 161 is fixedly mounted on the support platform 12. The rotary drive mechanism 16 includes a horizontally mounted drive shaft 162 that is rotatably mounted on the first fixed seat 161. A bracket 163 is slidably mounted along the length of the drive shaft 162. The bracket 163 comprises two perpendicular plates, each of which is rotatably connected to a first bevel gear 164 and a second bevel gear 165 via bearings. The first bevel gear 164 and the second bevel gear 165 mesh with each other. The first bevel gear 164 is coaxially connected to the drive shaft 162 via a spline, allowing the first bevel gear 164 to rotate synchronously with the drive shaft 162 and to slide axially along the drive shaft 162 along with the bracket 163.

[0038] The rotary drive mechanism 16 also includes a planetary gear transmission assembly 167, a second drive member 166, and a steering buffer assembly 168. The input end of the planetary gear transmission assembly 167 is connected to the second bevel gear 165, and the output end of the planetary gear transmission assembly 167 is connected to the rotating platform 15. The second drive member 166 is a motor that drives the drive shaft 162 to rotate. The steering buffer assembly 168 is used to offset the eccentricity of the rotating platform 15 during rotation.

[0039] Specifically, refer to Figure 9 Planetary gear transmission assembly 167 includes a rotatable first inner ring gear 1671 and a fixed first planet carrier 1672. Three first planetary gears 1673 are rotatably mounted on first planet carrier 1672. The outer sides of the three first planetary gears 1673 mesh with the first inner ring gear 1671, and the inner sides of the three first planetary gears 1673 mesh with a first sun gear 1674. First sun gear 1674 is coaxially fixed to second bevel gear 165. A planetary gear cover 1675 is fixedly connected to first inner ring gear 1671, and planetary gear cover 1675 is coaxially fixed to rotating platform 15.

[0040] The driving shaft 162 is driven to rotate by the second driving member 166 , and the rotary table 15 is driven by the first bevel gear 164 , the second bevel gear 165 and the planetary gear transmission assembly 167 to slowly rotate, thereby achieving workpiece positioning.

[0041] In order to improve the stability of the rotation of the rotating table 15, refer to Figure 1 The support platform 12 is rotatably provided with a plurality of support wheels 151. The lower end surface of the rotating table 15 is fixedly provided with an annular guide rail 152. The annular guide rail 152 is slidably adapted to the plurality of support wheels 151. During the rotation of the rotating table 15, the support wheels 151 roll along the annular guide rail 152, supporting the rotating table 15 while limiting the rotation trajectory of the rotating table 15.

[0042] Reference Figure 8 The steering buffer assembly 168 includes two buffer springs sleeved on the drive shaft 162. The two buffer springs are respectively located on both sides of the first bevel gear 164. In the assembled state, the two buffer springs are in a compressed state and have not reached the compression limit.

[0043] Specifically, refer to Figure 8The two ends of the driving shaft 162 are respectively provided with a first limiting part 1621 and a second limiting part 1622, wherein the first limiting part 1621 abuts against one side of the first fixed seat 161; the buffer spring comprises a first buffer spring 1681 and a second buffer spring 1682; wherein the two ends of the first buffer spring 1681 respectively abut against the inner side of the first bevel gear 164 and the first limiting part 1621, and the two ends of the second buffer spring 1682 respectively abut against the outer side of the angle frame 163 and the second limiting part 1622.

[0044] Further, referring to Figure 8 , a second fixed seat 1683 is fixedly arranged on the support platform 12, a horizontal guide rail 1684 is fixedly arranged on the second fixed seat 1683, and a sliding block 1685 is fixedly connected to one side of the angle frame 163 and is slidingly arranged on the horizontal guide rail 1684.

[0045] If the rotating table 15 rotates eccentrically due to assembly deviation or uneven bearing, the angle frame 163 can slide along the driving shaft 162 together with the first bevel gear 164 and the second bevel gear 165, in the process, the sliding block 1685 slides along the horizontal guide rail 1684, and the first buffer spring 1681 and the second buffer spring 1682 provide elastic buffering for the sliding of the angle frame 163 and the first bevel gear 164, thereby offsetting the eccentricity of the rotating table 15 and improving the stability of the rotation of the rotating table 15.

[0046] Referring to Figure 10 and Figure 11 , the powder mixing and conveying device 2 comprises a base 21, a powder premixing mechanism 22 and a powder mixing mechanism 23 arranged on the base 21. The powder premixing mechanism 22 is used for premixing multiple powders; the powder mixing mechanism 23 is connected to the discharge end of the powder premixing mechanism 22, and comprises a rotating mixing tank 231. The mixing tank 231 is in a cylindrical shape, the axis thereof is arranged obliquely, and the rotation axis thereof is arranged horizontally; the included angle between the axis of the mixing tank 231 and the rotation axis thereof is 15°-30°. A bidirectional stirring mechanism 24 is arranged in the mixing tank 231.

[0047] Referring to Figure 10 , the powder premixing mechanism 22 comprises multiple metal powder storage tanks 221 for respectively storing different kinds of metal powders. A powder conveying device 222 is mounted at the discharge end of each metal powder storage tank 221, a first conveying pipe 223 is connected to the discharge end of the powder conveying device 222, multiple first conveying pipes 223 are jointly connected to a second conveying pipe 225, and the second conveying pipe 225 is sequentially connected with a pneumatic conveying premixing device 224 and a third conveying pipe 226 along the powder conveying direction.

[0048] Different types of metal powder are output by the corresponding powder conveying device 222, pass through the first conveying pipe 223 and the second conveying pipe 225 in sequence, and enter the pneumatic conveying premixing device 224 for premixing. The premixed powder is conveyed to the mixing tank 231 by the third conveying pipe 226 for further mixing.

[0049] Reference Figure 11 and Figure 12 A feed end mounting base 232 is fixedly mounted on the base 21. A feed port 2321 is provided on the feed end mounting base 232. The feed port 2321 is connected to the discharge end (i.e., the third feed pipe 226) of the powder premixing mechanism 22. A feed pipe 233 is rotatably connected to the feed end mounting base 232 via a bearing. One end of the feed pipe 233 is connected to the feed port 2321, and the other end extends into the mixing tank 231. The feed pipe 233 is fixedly connected to the mixing tank 231. The feed pipe 233 is horizontally disposed, with its axis collinear with the rotation axis of the mixing tank 231.

[0050] Reference Figure 12 and Figure 13 The discharge end of the mixing tank 231 is provided with an annular feed pipe 234, which is fixedly connected to the mixing tank 231. The annular feed pipe 234 is arranged at an angle and is coaxial with the mixing tank 231. Furthermore, a plurality of feed holes 2341 are formed on the side of the annular feed pipe 234 facing the feed end of the mixing tank 231. The annular feed pipe 234 is connected to a discharge pipe 235 via a hollow pipe, and the annular feed pipe 234 is in communication with the discharge pipe 235. The discharge pipe 235 is arranged horizontally, and its axis is colinear with the rotation axis of the mixing tank 231; the discharge pipe 235 is fixedly connected to the mixing tank 231.

[0051] Reference Figure 13 A driving assembly for driving the discharge pipe 235 to rotate is provided on the base 21. Specifically, the driving assembly includes a first motor 236 fixedly provided on the base 21 and a reduction gear box 237 installed at the output end of the first motor 236. The output end of the reduction gear box 237 is fixedly connected to the discharge pipe 235.

[0052] The discharge pipe 235 is driven to rotate by the first motor 236, and the inclined mixing tank 231 rotates around the horizontal axis. The inclined cylinder wall causes the powder to be simultaneously subjected to the coupling effect of the tangential component of gravity and the radial component of centrifugal force. The movement trajectory of the powder in the tank is more complicated than that of a conventional drum-type mixing device. The powder moves in both the axial and radial directions of the mixing tank 231, thereby increasing the uniformity of mixing.

[0053] As the mixing tank 231 rotates around the horizontal axis, the inclined annular feed pipe 234 rotates synchronously with the mixing tank 231. When the side of the annular feed pipe 234 with the feed hole 2341 is rotated to face upward, the powder in the mixing tank 231 enters the annular feed pipe 234 through the feed hole 2341 under the action of its own gravity and the air pressure of the pneumatic conveying premixing device 224, and is then discharged through the discharge pipe 235, thereby achieving simultaneous mixing and conveying of the powder.

[0054] Reference Figure 14 and Figure 15 The bidirectional stirring mechanism 24 includes two stirring paddles 245 rotatably disposed within the mixing tank 231. The two stirring paddles 245 are coaxially disposed and rotate in opposite directions. The rotation axes of the stirring paddles 245 are colinear with the axis of the mixing tank 231. The bidirectional stirring mechanism 24 also includes an input shaft 241, a first sleeve 242, a second sleeve 243, and a planetary gear drive assembly 244. The first sleeve 242 is sleeved on the input shaft 241 and coaxially fixed to the input shaft 241. The second sleeve 243 is sleeved on the input shaft 241 and rotatably connected to the input shaft 241 via a bearing. The two stirring paddles 245 are respectively fixed to the first sleeve 242 and the second sleeve 243. The planetary gear drive assembly 244 is used to drive the input shaft 241 and the second sleeve 243 to rotate synchronously in opposite directions.

[0055] Further, refer to Figure 14 and Figure 15 The planetary gear drive assembly 244 includes a second inner ring gear 2441 and a second planet carrier 2442 that are rotatably arranged. Three second planetary gears 2443 are rotatably arranged on the second planet carrier 2442. The three second planetary gears 2443 are engaged with the second inner ring gear 2441. The three second planetary gears 2443 are jointly engaged with the second sun gear 2444; the second sun gear 2444 is coaxially fixed to the input shaft 241, and the second inner ring gear 2441 is coaxially fixed to the second sleeve 243; the planetary gear drive assembly 244 also includes a driving member for driving the input shaft 241 to rotate, and the driving member is a second motor 246.

[0056] Reference Figure 11 and Figure 14 The first sleeve 242 and the second sleeve 243 are respectively located in the mixing tank 231 near the discharge end and the feed end.

[0057] Reference Figure 14 Each stirring paddle 245 includes a plurality of spiral-shaped stirring blades 2451. The first sleeve 242 and the second sleeve 243 are fixedly connected to a stirring fan frame 2452 and a blade retainer 2453. The two ends of the stirring blade 2451 are respectively fixed to the stirring fan frame 2452 and the blade retainer 2453.

[0058] When the second motor 246 drives the input shaft 241 to rotate, the second inner ring 2441 rotates under the drive of the second sun gear 2444 and the second planetary gear 2443, and the rotation direction of the input shaft 241 is opposite to that of the second inner ring 2441, thereby realizing the synchronous reverse rotation of the first sleeve 242 and the second sleeve 243. In this way, the two stirring paddles 245 rotate synchronously in the opposite direction, which is beneficial to improving the stirring effect.

[0059] On the other hand, the rotational speed of the second sun gear 2444 is greater than the rotational speed of the second inner ring gear 2441, so that the rotational speed of the first sleeve 242 is greater than the rotational speed of the second sleeve 243, that is, the rotational speed of the stirring paddle 245 at the discharge end of the mixing tank 231 is greater than the rotational speed of the stirring paddle 245 at the feed end of the mixing tank 231; the feeding end of the mixing tank 231 stirs at a low speed to reduce the initial kinetic energy of the powder and avoid fine powder dust, while maintaining a sufficient shear rate to achieve coarse mixing; the discharge end of the mixing tank 231 stirs in reverse at high speed to produce a strong turbulent zone, which effectively breaks up the powder agglomerates at the conveying end, and the pressure pulsation generated by the high-speed stirring and the centrifugal compaction field formed by the rotation of the inclined mixing tank 231 offset each other, thereby suppressing powder stratification; the axial speed difference formed by the speed gradient is used to drive the powder to form a directional migration flow, thereby shortening the mixing cycle.

[0060] The mixing tank 231 rotates around the horizontal axis and cooperates with the shearing and mixing action of the bidirectional stirring mechanism 24, so that the powder undergoes a compound motion cycle of spiral climbing (axial diffusion), parabolic scattering (radial shearing), and impacting the stirring paddle 245 (turbulent crushing), thereby achieving a better mixing effect.

[0061] The implementation principle of the device for preparing wear-resistant and corrosion-resistant coating on the surface of heavy workpieces in the embodiment of the present application is as follows: the workpiece is placed on the rotating table 15, and the first driving member 1323 drives the screw 1321 to rotate, so that the threaded slider 1322 moves along the screw 1321, and the roller 1314 slides along the corresponding guide groove 1332. The inclined section 1333 of the guide groove 1332 can convert the horizontal movement of the threaded slider 1322 into the vertical movement of the guide plate 1331, thereby adjusting the distance between the support platform 12 and the base 21, and realizing the lifting and lowering of the support platform 12 on the base 21; in this process, the support arm 141 undergoes adaptive angle changes and provides support for the support platform 12; after the support platform 12 is lifted and lowered into place, the rotating table 15 is driven to rotate by the rotary drive mechanism 16, thereby realizing the positioning of the workpiece; compared with pneumatic or hydraulic drive, the screw drive method of the present application has better stability and is more suitable for carrying heavy workpieces.

[0062] The inclined mixing tank 231 rotates around the horizontal axis, and the inclined cylinder wall causes the powder to be simultaneously subjected to the coupling effect of the tangential component of gravity and the radial component of centrifugal force, making the movement trajectory of the powder in the tank more complex, thereby increasing the uniformity of mixing; combined with the shearing and mixing action of the bidirectional stirring mechanism 24, the uniform mixing of the powder is further promoted.

[0063] The mixed powder is output to the laser cladding head 31 to perform laser cladding on the surface of the workpiece to prepare a wear-resistant and corrosion-resistant coating. The multi-degree-of-freedom robot arm 3 helps to improve the flexibility of operation.

[0064] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for preparing a wear-resistant and corrosion-resistant coating on the surface of a heavy workpiece, characterized by: It includes a rotating stage, a powder mixing and conveying device and a multi-degree-of-freedom robotic arm; The free end of the multi-degree-of-freedom robotic arm is provided with a laser cladding head, and the laser cladding head is connected to the output end of the powder mixing and conveying device; The rotating stage includes a stage base, a supporting platform, a lifting mechanism, a lifting mechanism, a rotating stage and a rotating drive mechanism; The support platform is arranged on the stage base for lifting, and the lifting mechanism is used to drive the support platform to rise and fall; the lifting mechanism includes a sliding member, a screw drive assembly and a cam transmission assembly, the sliding member is slidably arranged on the lower end surface of the support platform, the screw drive assembly is used to drive the sliding member to slide in the horizontal direction, and the cam transmission assembly is used to convert the movement of the sliding member in the horizontal direction into the movement of the support platform in the vertical direction; The lifting mechanism is used to support the support platform during the process of the support platform being raised or lowered; The rotating platform is rotatably disposed on the supporting platform, and the rotating driving mechanism is used to drive the rotating platform to rotate.

2. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 1, characterized in that: The cam transmission assembly includes two oppositely arranged guide plates fixedly arranged on the worktable base, and guide grooves are respectively opened on the opposite sides of the two guide plates, and the guide grooves are provided with an inclined section; the sliding member includes a horizontally arranged roller shaft and rollers rotatably arranged at both ends of the roller shaft, and each of the rollers is slidably arranged in the corresponding guide groove.

3. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 2, characterized in that: The screw drive assembly includes a screw rotatably arranged on the lower end surface of the support platform and a first driving member for driving the screw to rotate. The screw is threadedly connected to a threaded slider, and the threaded slider is fixed to the roller shaft.

4. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 3, characterized in that: A slide rail is fixedly provided on the lower end surface of the support platform, and the slide rail is parallel to the lead screw. The threaded slider is fixedly connected to a connecting seat, and a sliding part is provided on one side of the connecting seat, and the sliding part is slidably provided on the slide rail.

5. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 1, characterized in that: The lifting mechanism includes a plurality of support arms hinged on the loading platform base, and the plurality of support arms are arranged at intervals along the circumference of the loading platform base; one end of the support arm is supported on the lower end surface of the support platform, and the other end of the support arm is hinged to an adjustment arm, and the end of the adjustment arm away from the support arm is hinged to the loading platform base.

6. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 5, characterized in that: One end of the support arm away from the adjustment arm is rotatably connected to a roller, and a lower end surface of the support platform is fixedly provided with a plurality of radial guide rails along its own radial direction, and the rollers are slidably provided in the corresponding radial guide rails.

7. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 1, characterized in that: A first fixing seat is fixedly provided on the support platform, and the rotation drive mechanism includes a drive shaft rotatably provided on the first fixing seat, an angle bracket is slidably provided on the drive shaft along its length direction, and a first bevel gear and a second bevel gear that are meshed with each other are rotatably connected to the angle bracket, and the first bevel gear is connected to the drive shaft through a spline; The rotary drive mechanism also includes a planetary gear transmission assembly, a second drive member and a steering buffer assembly, the input end of the planetary gear transmission assembly is connected to the second bevel gear, and the output end of the planetary gear transmission assembly is connected to the turntable; the second drive member is used to drive the drive shaft to rotate; the steering buffer assembly is used to offset the eccentricity during the rotation of the turntable.

8. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 7, characterized in that: The steering buffer assembly includes two buffer springs sleeved on the drive shaft, and the two buffer springs are respectively located on both sides of the first bevel gear.

9. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 8, characterized in that: A second fixing seat is fixedly provided on the support platform, a horizontal guide rail is fixedly provided on the second fixing seat, a sliding block is fixedly connected to the angle bracket, and the sliding block is slidably provided on the horizontal guide rail.

10. The device for preparing a wear-resistant and corrosion-resistant coating on a heavy workpiece surface according to claim 1, characterized in that: The powder mixing and conveying device includes a base, a powder premixing mechanism, a powder mixing mechanism and a bidirectional stirring mechanism; the powder mixing mechanism is connected to the discharge end of the powder premixing mechanism, and the powder mixing mechanism includes a rotatably arranged mixing tank, the mixing tank is cylindrical, its axis is inclined, and its rotation axis is horizontally arranged; the bidirectional stirring mechanism includes two stirring paddles rotatably arranged in the mixing tank, the two stirring paddles are coaxially arranged and rotate in opposite directions, and the rotation axis of the stirring paddle is collinear with the axis of the mixing tank.

Images