A positioning device and positioning method for ternary blade tailor-welding on a shaft disc surface

Abstract

The application provides a positioning device and a positioning method for ternary blade splicing on a shaft disc surface, comprising a positioning seat, a positioning support, a shaft disc, a line, a positioning cover plate, a positioning pointer, an import end positioning assembly and an export end positioning assembly; the positioning seat comprises a positioning support, the shaft disc is sleeved on the positioning support, the shaft center of the shaft hole on the shaft disc is the same as the shaft center of the positioning support, and a plurality of lines matched with the bottom edges of the blades to be installed are arranged on the shaft disc. The application determines the side position of the import end of the blade to be installed on the shaft disc through the positioning pointer, positions the space position of the import end of the blade to be installed through the first pin and the second pin, and finally positions the export end of the blade to be installed through the export end positioning assembly. The accurate positioning of the blade to be installed on the shaft disc is completed through multiple operations, and then the subsequent splicing and other related operations of each blade to be installed can be performed.

Description

Technical Field

[0001] This application belongs to the field of compressor technology, specifically relating to a positioning device and positioning method for welding three-dimensional blades onto the surface of a shaft disk. Background Technology

[0002] The existing compressor impeller structure consists of a cover plate, a shaft plate, and blades assembled and welded together. The conventional manufacturing method involves welding the blades to the impeller cover plate surface, machining them, and then welding the entire assembly to the impeller shaft plate. To save on impeller manufacturing costs, the welding method needs to be changed. Instead, the blades should first be welded to the impeller shaft plate surface before being welded to the cover plate. However, because the shaft plate surface is a smooth curved surface, lacking any clamping or gripping surfaces, precisely welding the three-dimensional blades with their spatially twisted shape to the equally smooth curved surface of the shaft plate presents significant challenges. Maintaining blade assembly accuracy further complicates the process. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To address the aforementioned issues, this application provides a positioning device for welding three-dimensional blades onto the surface of a shaft disk, comprising: a positioning seat, a positioning support, a shaft disk, engraving lines, a positioning cover plate, a positioning pointer, an inlet end positioning component, and an outlet end positioning component;

[0005] The positioning seat includes a positioning support column, a shaft disc sleeved on the positioning support column, the axis of the shaft hole on the shaft disc being the same as the axis of the positioning support column, a plurality of engraved lines on the shaft disc matching the bottom edge of the blade to be installed, a positioning cover plate sleeved on the positioning support column for fixing the top of the shaft disc, a plurality of positioning pointers being set on the circumference of the positioning cover plate, the positioning pointers pointing to the inlet end of the engraved lines, an inlet end positioning component being set on the positioning cover plate for positioning at least two points in space on the top of the inlet side of the blade to be installed, and an outlet end positioning component being set on the shaft disc for positioning at least one point on the outlet side of the blade to be installed.

[0006] Optionally, the positioning cover plate includes a fixing section, a limiting section, and a sleeve;

[0007] The fixed section has an installation hole, the sleeve is installed on the fixed section, the positioning support is installed in the installation hole through the sleeve, the limiting section is installed on the side of the fixed section away from the installation hole, the limiting section is used to fix the shaft disk, and a plurality of positioning pointers are set on the outer circumference of the limiting section.

[0008] Optionally, the positioning cover plate further includes a first limiting member;

[0009] The first limiting member is disposed on the sleeve and is used to fix the positioning cover plate on the positioning support.

[0010] Optionally, the inlet end positioning component includes: an inlet side positioning plate, a first pin, and a second pin;

[0011] The inlet-side positioning plate is disposed on the fixed section. The inlet-side positioning plate is provided with a first pin and a second pin. The first pin and the second pin are used to position the top of the inlet side of the blade to be installed at at least two points in space.

[0012] Optionally, the inlet positioning assembly further includes a connecting plate;

[0013] The first end of the connecting plate is connected to the inlet-side positioning plate, and the second end of the connecting plate is connected to the second pin.

[0014] Optionally, the outlet positioning component includes: a fixed base and an outlet positioning plate;

[0015] The fixed base is detachably mounted on the outer circumference of the shaft disk, and the outlet end positioning plate is mounted on the fixed base. The outlet end positioning plate is used to position at least one point on the outlet side of the blade to be installed.

[0016] Optionally, the fixing base includes: a fixing block, a clamping plate, and a second limiting member;

[0017] The fixing block is disposed on the shaft disk, the clamping plate is disposed on the fixing block and located on one side of the shaft disk, the second limiting member is disposed on the clamping plate, and the second limiting member is in contact with the bottom of the shaft disk.

[0018] Optionally, the positioning seat further includes a base plate, the positioning support is disposed on the base plate, and the base plate is located in the shaft hole of the shaft disk.

[0019] Optionally, a number of shims are provided at the bottom of the base plate and the bottom of the shaft disk, and the bottom of the base plate and the bottom of the shaft disk are on the same horizontal plane.

[0020] This application also provides a positioning method for welding ternary blades onto the surface of a shaft disk, employing any one of the above positioning devices for welding ternary blades onto the surface of a shaft disk, comprising the following steps:

[0021] Step 1, Marking lines on the surface of the shaft disk: Before assembling the blades to be installed, mark lines on the surface of the shaft disk according to the number of blades to be installed;

[0022] Step 2: Determining the position of the inlet end of the blade to be installed on the side of the shaft disk: Place the shaft disk on the positioning seat. The positioning support in the positioning seat is the same as the shaft disk axis. The positioning cover is sleeved on the positioning support to fix the shaft disk. Several positioning pointers pointing to the inlet end of the engraved line are installed on the circumference of the positioning cover.

[0023] Step 3: Determining the position of the inlet end of the blade to be installed on the cover plate side: The inlet side positioning plate is installed on the positioning cover plate. The blade to be installed is installed on the shaft plate with the engraved line as the boundary line. The first pin and the second pin are installed on the inlet side positioning plate. When the positioning pointer points to the engraved line inlet end, the first pin and the second pin can position the inlet end of the blade to be installed in space, thereby determining the position of the end point on the cover plate side.

[0024] Step 4: Determine the position of the blade to be installed on the shaft disk outlet section: Install the outlet end positioning component on the shaft disk, and position the blade to be installed at least on the outlet side.

[0025] Beneficial effects

[0026] The positioning device and method for welding ternary blades onto the surface of a shaft disk provided in the embodiments of the present invention involve marking lines on the surface of the shaft disk according to the number of blades to be installed, using a positioning pointer to determine the position of the inlet end of the blade to be installed on the side of the shaft disk, using a first pin and a second pin to position the inlet end of the blade to be installed in space, thus determining the position of the end point on the side of the cover disk, and finally using an outlet end positioning component to position the outlet end of the blade to be installed. Multiple operations work together to accurately position the blades to be installed on the shaft disk, after which subsequent welding and other related operations can be performed on each blade to be installed. Attached Figure Description

[0027] Figure 1 This is a side sectional view of the present invention;

[0028] Figure 2 This is a structural diagram of the positioning cover plate, the inlet end positioning component, and the connection of the engraved lines according to the present invention;

[0029] Figure 3 This is a side sectional view of the positioning cover plate of the present invention;

[0030] Figure 4 This is a top view of the positioning cover plate of the present invention;

[0031] Figure 5 This is a structural diagram of the positioning seat of the present invention;

[0032] Figure 6 This is a schematic diagram of the process of the present invention.

[0033] The reference numerals in the attached figures are as follows:

[0034] 1. Positioning seat; 2. Positioning support; 3. Shaft disc; 4. Engraved line; 5. Positioning cover plate; 51. Fixed section; 52. Limiting section; 53. Sleeve; 54. First limiting component; 6. Positioning pointer; 7. Inlet end positioning assembly; 71. Inlet side positioning plate; 72. First pin; 73. Second pin; 74. Connecting plate; 8. Outlet end positioning assembly; 81. Fixed seat; 811. Fixed block; 812. Clamping plate; 813. Second limiting component; 82. Outlet end positioning plate; 9. Base plate; 10. Shim. Detailed Implementation

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] See also Figure 1-5As shown, a positioning device for welding ternary blades onto the surface of a shaft disk according to an embodiment of this application includes: a positioning seat 1, a positioning support 2, a shaft disk 3, engraved lines 4, a positioning cover plate 5, positioning pointers 6, an inlet end positioning component 7, and an outlet end positioning component 8. The positioning seat 1 includes the positioning support 2, the shaft disk 3 is sleeved on the positioning support 2, the axis of the shaft hole on the shaft disk 3 is the same as the axis of the positioning support 2, the shaft disk 3 has a plurality of engraved lines 4 that match the bottom edge of the blade to be installed, the positioning cover plate 5 is sleeved on the positioning support 2 for fixing the top of the shaft disk 3, a plurality of positioning pointers 6 are arranged circumferentially on the positioning cover plate 5, the positioning pointers 6 point to the inlet end of the engraved lines 4, the inlet end positioning component 7 is arranged on the positioning cover plate 5 for positioning at least two points in space on the top of the inlet side of the blade to be installed, and the outlet end positioning component 8 is arranged on the shaft disk 3 for positioning at least one point on the outlet side of the blade to be installed.

[0040] Specifically, several engraved lines 4 are made on the shaft disk 3, matching the bottom boundary of the blade to be installed. The shaft disk 3 is installed on the positioning seat 1 through the shaft hole in the center of the shaft disk 3. The positioning support 2 is located in the shaft hole of the shaft disk 3. After installation, the shaft hole of the shaft disk 3 is aligned by using a dial indicator, so that the axis of the positioning support 2 is the same as the axis of the shaft hole of the shaft disk 3, which facilitates subsequent operations. The positioning cover plate 5 is fitted onto the positioning support 2. The positioning cover plate 5 is located above the shaft disk 3, which can fix the shaft disk 3 from above. Several positioning pointers 6 are installed on the positioning cover plate 5. The positioning pointers 6 are installed at equal angles on the positioning cover plate 5, and the ends of the positioning pointers 6 point to the inlet end of the engraved line 4 on the shaft disk 3. After installing one blade, the position of the inlet end of the next blade to be installed on the shaft disk 3 can be determined by the next positioning pointer 6, which facilitates the installation of subsequent blades. The inlet-end positioning component 7 is installed on the positioning cover plate 5. After the positioning pointer 6 can determine the inlet end position of the engraving line 4 on the blade to be installed, the inlet-end positioning component 7 is used to position at least two points in space on the top of the inlet side of the blade to be installed. Therefore, when the positioning cover plate 5 is rotated and the positioning pointer 6 moves to point to the inlet end of the engraving line 4 on the next shaft disk 3, the inlet-end positioning component 7 also moves to position at least two points in space on the top of the inlet side of the next blade to be installed. This facilitates installation and determines the position of the end point on the side of the cover plate, improving the accuracy of subsequent welding and assembly. The outlet-end positioning component 8 is set on the shaft disk 3 and is used to position at least one point on the outlet side of the blade to be installed. Multiple operations work together to accurately position the blade to be installed on the shaft disk 3. After that, subsequent welding and other related operations can be performed on each blade to be installed, improving the efficiency of subsequent blade installation, as well as the accuracy of each blade installation, and improving the quality of the finished impeller after welding.

[0041] The positioning cover plate 5 includes a fixing section 51, a limiting section 52, and a sleeve 53;

[0042] The fixed section 51 has an installation hole, the sleeve 53 is installed on the fixed section 51, the positioning support 2 is installed in the installation hole through the sleeve 53, the limiting section 52 is installed on the side of the fixed section 51 away from the installation hole, the limiting section 52 is used to fix the shaft disk 3, and a plurality of positioning pointers 6 are arranged on the outer circumference of the limiting section 52.

[0043] The positioning cover plate 5 also includes a first limiting member 54;

[0044] The first limiting member 54 is disposed on the sleeve 53 and is used to fix the positioning cover plate 5 on the positioning support 2.

[0045] Specifically, the positioning cover plate 5 includes a fixed section 51, a limiting section 52, and a sleeve 53. The fixed section 51 has an installation hole, and the sleeve 53 is installed on the fixed section 51. The fixed section 51 is fitted onto the positioning support 2 through the sleeve 53 and the installation hole to achieve connection with the positioning support 2. The first limiting member 54 is installed on the sleeve 53 to fix the installed sleeve 53 to the positioning support 2. The limiting section 52 is installed at the bottom of the fixed section 51, and the end of the limiting section 52 away from the fixed section 51 contacts the shaft disk 3 to fix the shaft disk 3. Several positioning pointers 6 are installed on the limiting section 52, and the ends of the positioning pointers 6 point to the inlet end of the engraving line 4 on the shaft disk 3 to determine the inlet end of multiple engraving lines 4. When the positioning cover plate 5 is rotated, the positioning pointers 6 can be moved to point to the inlet end of the engraving line 4 on the next shaft disk 3, which facilitates the positioning and installation of the blade to be installed.

[0046] The inlet end positioning component 7 includes: an inlet side positioning plate 71, a first pin 72, and a second pin 73;

[0047] The inlet-side positioning plate 71 is disposed on the fixed section 51. The inlet-side positioning plate 71 is provided with a first pin 72 and a second pin 73. The first pin 72 and the second pin 73 are used to position the top of the inlet side of the blade to be installed at at least two points in space.

[0048] The inlet positioning component 7 also includes a connecting plate 74;

[0049] The first end of the connecting plate 74 is connected to the inlet side positioning plate 71, and the second end of the connecting plate 74 is connected to the second pin 73.

[0050] Specifically, the inlet-side positioning plate 71 is bolted to the fixed section 51. The axis of the inlet-side positioning plate 71 intersects with the axis of the positioning support 2. The first pin 72 is installed on the inlet-side positioning plate 71, and the second pin 73 is connected to the inlet-side positioning plate 71 through the connecting plate 74. The heights of the first pin 72 and the second pin 73 can be adjusted according to the usage requirements. Therefore, the first pin 72 and the second pin 73 can be positioned at least two points in space at the top of the inlet side of the blade to be installed, thereby determining the position of the end point on the cover plate side. This enables rapid positioning when installing the blade to be installed and the shaft plate 3, and also improves the accuracy of subsequent welding and assembly.

[0051] The first pin 72 and the second pin 73 are respectively screwed onto the inlet side positioning plate 71 and the connecting plate 74 to facilitate their installation.

[0052] The outlet positioning component 8 includes: a fixed base 81 and an outlet positioning plate 82;

[0053] The fixed base 81 is detachably mounted on the outer circumference of the shaft disk 3, and the outlet end positioning plate 82 is mounted on the fixed base 81. The outlet end positioning plate 82 is used to position at least one point on the outlet side of the blade to be installed.

[0054] Specifically, the outlet positioning component 8 includes a fixed base 81 and an outlet positioning plate 82. The fixed base 81 is detachably mounted on the outer circumference of the shaft disk 3. The fixed base 81 is used to fix the outlet positioning plate 82. The outlet positioning plate 82 is used to position at least one point on the outlet side of the blade to be installed, thereby positioning the outlet end position of the blade to be installed.

[0055] The fixing base 81 includes: a fixing block 811, a clamping plate 812 and a second limiting member 813;

[0056] The fixing block 811 is disposed on the shaft disk 3, the clamping plate 812 is disposed on the fixing block 811 and located on one side of the shaft disk 3, the second limiting member 813 is disposed on the clamping plate 812, and the second limiting member 813 is in contact with the bottom of the shaft disk 3.

[0057] Specifically, the fixing block 811 is installed on the shaft disk 3, and the clamping plate 812 has an L-shaped structure. One end of the clamping plate 81 is connected to the fixing seat 81 by bolts, and the other end is located at the bottom of the shaft disk 3. The second limiting member 813 is installed on the clamping plate 812 and located at the bottom of the shaft disk 3. The second limiting member 813 is a limiting screw. By rotating the second limiting member 813, the fixing seat 81 can be fixed on the shaft disk 3, which facilitates the disassembly and installation of the fixing seat 81. It can also adjust the installation position of the fixing seat 81 and the outlet end positioning plate 82 as needed to achieve positioning of the outlet end of different blades to be installed.

[0058] The positioning seat 1 also includes a base plate 9, and the positioning support column 2 is disposed on the base plate 9. The base plate 9 is located in the shaft hole of the shaft disk 3.

[0059] A number of shims 10 are provided at the bottom of the base plate 9 and the bottom of the shaft disk 3, and the bottom of the base plate 9 and the bottom of the shaft disk 3 are on the same horizontal plane.

[0060] Specifically, the positioning seat 1 consists of a base plate 9 and a positioning support 2. The positioning support 2 is installed on the base plate 9 with screws. The shaft disc 3 can be fitted on the outside of the positioning support 2 or on the outside of the base plate 9. Different installation methods can be selected according to different shaft discs 3. At the same time, when the shaft disc 3 is fitted on the base plate 9, shims 10 of the same height need to be used at the bottom of the base plate 9 and the bottom of the shaft disc 3. This can make the shaft disc 3 and the bottom of the base plate 9 lie in the same plane, which facilitates the disassembly and installation of the fixing seat 81 and improves the accuracy of the blade to be installed on the shaft disc 3. When the shaft disc 3 is fitted on the outside of the positioning support 2, the bottom of the shaft disc 3 can be directly installed on the base plate 9.

[0061] See also Figure 1-6 As shown, this application also provides a positioning method for welding ternary blades onto the surface of a shaft disk, employing any one of the above positioning devices for welding ternary blades onto the surface of a shaft disk, comprising the following steps:

[0062] Step 1, scribing lines 4 on the surface of the shaft disk 3: Before assembling the blades to be installed, scribing lines 4 on the surface of the shaft disk 3 according to the number of blades to be installed. The scribing lines 4 are the boundary lines between the blades to be installed and the shaft disk 3. The boundary lines between each blade to be installed and the shaft disk 3 need to be scribed.

[0063] Step 2: Determining the position of the inlet end of the blade to be installed on the side of the shaft disk 3: Place the shaft disk 3 on the positioning seat 1. The positioning support 2 in the positioning seat 1 is the same as the axis of the shaft disk 3. The positioning cover plate 5 is sleeved on the positioning support 2. The limiting section 52 in the positioning cover plate 5 is used to fix the shaft disk 3. Several positioning pointers 6 pointing to the inlet end of the engraving line 4 are installed in the circumference of the limiting section 52 of the positioning cover plate 5. The number of positioning pointers 6 is at least three.

[0064] Step 3: Determining the position of the inlet end of the blade to be installed on the cover plate side: The inlet side positioning plate 71 is installed on the positioning cover plate 5. The blade to be installed is installed on the shaft disk 3 with the engraved line 4 as the boundary line. The first pin 72 and the second pin 73 are installed on the inlet side positioning plate 71. The height of the first pin 72 and the second pin 73 is adjusted. When the positioning pointer 6 points to the inlet end of the engraved line 4, the first pin 72 and the second pin 73 can be positioned in space to locate the inlet end of the blade to be installed, thus determining the position of the end point on the cover plate side. At this time, when the positioning cover plate 5 is rotated according to the angle between adjacent blades to be installed, when the positioning pointer 6 moves to point to the inlet end of the next blade to be installed on the engraved line 4 on the shaft disk 3, the inlet side positioning plate 71 also moves, and the first pin 72 and the second pin 73 also move to locate at least two points in space on the top of the inlet side of the next blade to be installed. This facilitates the installation of the blade to be installed and determines the position of the end point on the cover plate side, improving the accuracy of subsequent welding and assembly.

[0065] Step 4: Determine the position of the blade to be installed at the outlet section of the shaft disk 3: Install the outlet end positioning component 8 on the shaft disk 3 and position it at least on the outlet side of the blade to be installed, thereby achieving accurate positioning of the blade to be installed.

[0066] By marking lines 4 on the side of the shaft disk 3 according to the number of blades to be installed, the positioning pointer 6 determines the position of the inlet end of the blade to be installed on the side of the shaft disk 3. The first pin 72 and the second pin 73 position the inlet end of the blade to be installed in space, thereby determining the position of the end point on the side of the cover disk. Finally, the outlet end positioning component 8 completes the positioning of the outlet end of the blade to be installed. Multiple operations work together to accurately position the blade to be installed on the shaft disk 3. After that, subsequent welding and other related operations can be performed on each blade to be installed. This improves the efficiency of subsequent blade installation, as well as the accuracy of each blade installation, and improves the quality of the finished impeller after welding.

[0067] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A positioning device for welding three-dimensional blades onto the surface of a shaft disk, characterized in that, include: Positioning seat (1), positioning support (2), shaft disc (3), engraving line (4), positioning cover plate (5), positioning pointer (6), inlet end positioning component (7) and outlet end positioning component (8); The positioning seat (1) includes a positioning support (2), the shaft disk (3) is sleeved on the positioning support (2), the axis of the shaft hole on the shaft disk (3) is the same as the axis of the positioning support (2), the shaft disk (3) is provided with a plurality of engraved lines (4) that match the bottom edge of the blade to be installed, the positioning cover plate (5) is sleeved on the positioning support (2) for fixing the top of the shaft disk (3), a plurality of positioning pointers (6) are set on the circumference of the positioning cover plate (5), the positioning pointers (6) point to the inlet end of the engraved line (4), the inlet end positioning component (7) is set on the positioning cover plate (5) for positioning at least two points in space on the top of the inlet side of the blade to be installed, and the outlet end positioning component (8) is set on the shaft disk (3) for positioning at least one point on the outlet side of the blade to be installed.

2. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 1, characterized in that, The positioning cover plate (5) includes a fixing section (51), a limiting section (52), and a sleeve (53); The fixed section (51) has an installation hole, the sleeve (53) is installed on the fixed section (51), the positioning support (2) is installed in the installation hole through the sleeve (53), the limiting section (52) is installed on the side of the fixed section (51) away from the installation hole, the limiting section (52) is used to fix the shaft disk (3), and a plurality of positioning pointers (6) are set on the outer circumference of the limiting section (52).

3. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 2, characterized in that, The positioning cover plate (5) also includes a first limiting member (54); The first limiting member (54) is disposed on the sleeve (53) for fixing the positioning cover plate (5) on the positioning support (2).

4. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 3, characterized in that, The inlet end positioning component (7) includes: an inlet side positioning plate (71), a first pin (72) and a second pin (73); The inlet side positioning plate (71) is disposed on the fixed section (51). The inlet side positioning plate (71) is provided with a first pin (72) and a second pin (73). The first pin (72) and the second pin (73) are used to position the top of the inlet side of the blade to be installed at at least two points in space.

5. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 4, characterized in that, The inlet positioning component (7) also includes a connecting plate (74); The first end of the connecting plate (74) is connected to the inlet side positioning plate (71), and the second end of the connecting plate (74) is connected to the second pin (73).

6. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 1, characterized in that, The outlet positioning component (8) includes: a fixed base (81) and an outlet positioning plate (82); The fixed seat (81) is detachably mounted on the outer circumference of the shaft disk (3), and the outlet end positioning plate (82) is mounted on the fixed seat (81). The outlet end positioning plate (82) is used to position at least one point on the outlet side of the blade to be installed.

7. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 6, characterized in that, The fixing base (81) includes: a fixing block (811), a clamping plate (812), and a second limiting member (813); The fixing block (811) is disposed on the shaft disk (3), the clamping plate (812) is disposed on the fixing block (811) and located on one side of the shaft disk (3), the second limiting member (813) is disposed on the clamping plate (812), and the second limiting member (813) is in contact with the bottom of the shaft disk (3).

8. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 7, characterized in that, The positioning seat (1) also includes a base plate (9), the positioning support (2) is disposed on the base plate (9), and the base plate (9) is located in the shaft hole of the shaft disk (3).

9. The positioning device for welding three-dimensional blades onto the surface of a shaft disk according to claim 8, characterized in that, The bottom of the base plate (9) and the bottom of the shaft disk (3) are provided with several shims (10), and the bottom of the base plate (9) and the bottom of the shaft disk (3) are on the same horizontal plane.

10. A method for positioning ternary blades welded onto the surface of a shaft disk, characterized in that, The positioning device for welding ternary blades onto the surface of a shaft disk as described in any one of claims 1-9 includes the following steps: Step 1, scribing lines (4) on the surface of the shaft disk (3): Before assembling the blades to be installed, scribing lines (4) on the surface of the shaft disk (3) according to the number of blades to be installed; Step 2: Determine the position of the inlet end of the blade to be installed on the side of the shaft disk (3): Place the shaft disk (3) on the positioning seat (1). The positioning support (2) in the positioning seat (1) is the same as the axis of the shaft disk (3). The positioning cover plate (5) is sleeved on the positioning support (2) to fix the shaft disk (3). Several directional engravings (4) on the circumference of the positioning cover plate (5) point to the positioning pointer (6) of the inlet end. Step 3: Determining the position of the inlet end of the blade to be installed on the cover plate side: The inlet side positioning plate (71) is installed on the positioning cover plate (5). The blade to be installed is installed on the shaft plate (3) with the engraved line (4) as the boundary line. The first pin (72) and the second pin (73) are installed on the inlet side positioning plate (71). When the positioning pointer (6) points to the inlet end of the engraved line (4), the first pin (72) and the second pin (73) can position the inlet end of the blade to be installed in space, thereby determining the position of the end point on the cover plate side. Step 4: Determine the position of the blade to be installed on the outlet section of the shaft disk (3): Install the outlet end positioning component (8) on the shaft disk (3) and position at least one point on the outlet side of the blade to be installed.

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