Scraper repair welding positioning device

Abstract

The utility model relates to a scraper repair welding positioning device which comprises a positioning column and a positioning arm arranged on the positioning column and perpendicular to the axis of the positioning column, the positioning arm is provided with a side limiting component for limiting the side edge of a scraper, and the positioning arm is provided with a top limiting component for limiting the top of the scraper. The bottom of the positioning column is provided with a fixing part used for being fixed to the center of the cutter head, the positioning column is of a coaxial rotating type structure and comprises an inner column and an outer pipe, and the positioning arm is connected with the outer pipe; and a locking and fixing device is arranged between the inner column and the outer pipe. The outer pipe can rotate relative to the inner column, the positioning arm covers the position of the whole cutter head, and the repair welding positioning requirement of the scraper at any position on the cutter head is met; the side edge of the scraper base and the top of the tungsten alloy block on the scraper are positioned through the side limiting component and the top limiting component, after the position of the scraper base is determined, the scraper base can be fixed through the clamp, then welding is carried out, and finally the position of the scraper meets the design requirement.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel boring machine repair, and in particular relates to a scraper repair welding positioning device. Background Technology

[0002] The scrapers on the cutterhead of a tunnel boring machine (TBM) are crucial components of the cutting system, primarily used for cutting soft soil, loading excavated soil, and assisting in scraping debris from hard rock formations. China has over 5,000 TBMs in operation, with approximately 300-500 units decommissioned annually. A single TBM cutterhead typically carries 60-120 scrapers, each with 3-10 tungsten alloy blocks (hardness ≥85 HRA) embedded in its blade holder. Among decommissioned TBMs, approximately 40% of the scrapers fail due to cracking or wear of the tungsten alloy blocks, necessitating scraper repair.

[0003] Once the tungsten alloy of the scraper fails, the entire scraper needs to be removed from the cutterhead, replaced with a new scraper, and then fixed back onto the cutterhead. However, this kind of repair is usually not carried out at the production plant, but rather at the tunnel boring machine storage site. This makes the repair troublesome, as it is often difficult to position the scraper at the storage site. Therefore, a device is needed to position the scraper to facilitate scraper repair at the tunnel boring machine storage site. Summary of the Invention

[0004] This utility model provides a scraper repair welding positioning device, which uses the center of the existing cutter head as the positioning reference. The device limits the position of the scraper relative to the cutter head and the relative position between scrapers, thereby facilitating scraper welding and fixing and completing the repair.

[0005] The specific technical solution of this utility model is as follows: a scraper repair welding positioning device includes a positioning column, a positioning arm disposed on the positioning column perpendicular to the axis of the positioning column, the positioning arm having a side limiting component for limiting the side of the scraper, and a top limiting component for limiting the top of the scraper; the bottom of the positioning column is provided with a fixing part for fixing to the center of the cutter head, the positioning column has a coaxial rotating structure, the positioning column includes an inner column and an outer tube, the positioning arm is connected to the outer tube; a locking and fixing device is provided between the inner column and the outer tube.

[0006] The positioning column is fixed to the center of the tunnel boring machine cutterhead. The positioning column adopts a coaxial rotating structure, and the outer tube can rotate relative to the inner column. In this way, the positioning arm on the outer tube can cover the entire position of the cutterhead by rotation. The positioning arm can be used for positioning to meet the needs of repair welding positioning of the scraper at any position on the cutterhead. The positioning arm is mainly used for positioning the scraper seat for welding. It must meet the positioning of the side of the scraper seat and the top of the tungsten alloy block on the scraper. The positioning arm has side limiting components and top limiting components. After the position of the scraper seat is determined, the scraper seat can be fixed by the clamp, and then welding can be carried out. Finally, the position of the scraper meets the design requirements. The positioning arm has a certain width, which allows the side limiting components of the positioning arm to position the side of the scraper.

[0007] Preferably, the fixing part at the bottom of the positioning column is disc-shaped, and the fixing part is provided with fixing holes distributed in a circle; a plane bearing is provided on the fixing part, the lower end of the outer tube is connected to the plane bearing, and the plane bearing is sleeved on the inner column. The plane bearing facilitates the rotation of the outer tube relative to the inner column.

[0008] Preferably, the inner column has a coaxial threaded rod at its top, and the outer tube is closed at its top with a through hole for the threaded rod to extend out. The locking and fixing device is installed on the portion of the threaded rod extending beyond the top of the outer tube. Once the locking and fixing device is locked, the outer tube cannot rotate relative to the inner column, ensuring accurate positioning. After unlocking, the outer tube can rotate relative to the inner column, and the positioning arm can be rotated to any desired position.

[0009] Preferably, the locking and fixing device adopts a circular rotating disk structure. The locking and fixing device includes a locking tube with a central internal threaded hole, a radial rod on the outer surface of the locking tube, a handle tube connected to the end of the radial rod, the handle tube being circularly curved, and the lower end of the locking tube having a part that contacts the top surface of the outer tube.

[0010] Preferably, the positioning arm includes a proximal end and a main body, with the proximal end and the main body connected by an assembly-type structure; the proximal end and the main body are connected by a hinge, allowing the main body to rotate relative to the proximal end around the hinge; or the proximal end and the main body are connected by an assembly-type structure. The hinged connection allows the main body to rotate around the hinge, reducing the torque of the positioning arm relative to the positioning post and minimizing deformation; the assembly-type connection indicates that the main body and the proximal end are a disassembly and assembly structure; the assembly-type connection allows the main body to be replaced as needed, and the length and width of the main body can be selected, allowing the side limiting components and top limiting components to adapt to the required scraper positioning needs.

[0011] Preferably, the positioning arm is a fixed structure relative to the outer tube, with the proximal end of the positioning arm fixed perpendicularly to the outer tube; or the positioning arm is a lifting and moving structure relative to the outer tube, with a sliding groove structure provided on the outside of the outer tube, the positioning arm slidingly engaging with the sliding groove structure, and a locking device provided between the positioning arm and the sliding groove structure.

[0012] Preferably, the positioning arm is a fixed structure relative to the outer tube, a fixing plate is fixed to the outside of the outer tube, the fixing plate is provided with a connection hole, a support seat is provided on the far end of the main body of the positioning arm, and a diagonal brace is connected between the support seat and the fixing plate.

[0013] Preferably, the positioning arm has a lifting and moving structure relative to the outer tube. The slide structure is made of plate assembly welded and fixed. The slide structure has a slide extending vertically with a side opening. The end of the positioning arm near the end is provided with a slide plate that matches the slide. The slide plate is T-shaped. The middle part of the slide plate matches the opening of the slide structure. A connection hole is provided on the middle part.

[0014] Preferably, locking limit plates are provided on both sides of the opening of the slide structure, and a limit groove is provided in the middle of the locking limit plates. The locking device includes a U-shaped clamping arm and a locking screw. Threaded holes are provided at both ends of the clamping arm, and the locking screw is fitted into the threaded holes. Both ends of the clamping arm are inserted into the limit groove.

[0015] Preferably, the main body of the positioning arm is a segmented splicing structure. Each segment includes a middle main body and connecting parts fixed to both ends of the middle main body. The connecting parts are provided with fixing holes. The connecting parts of adjacent segments are opposite each other. Bolts pass through the fixing holes and are fixed. A support seat is provided on the far end of the middle main body of each segment. The segment connected to the near end is the first segment. The end connecting part of the first segment is hinged to the end of the near end.

[0016] The beneficial effects of this utility model are as follows: the positioning column is fixed to the center of the tunnel boring machine cutterhead. The positioning column adopts a coaxial rotating structure, and the outer tube can rotate relative to the inner column. In this way, the positioning arm on the outer tube can cover the entire position of the cutterhead by rotating. Positioning can be achieved by the positioning arm, which meets the needs of repair welding positioning of the scraper at any position on the cutterhead. The positioning arm is mainly used to position the scraper seat for welding. Here, it is necessary to meet the side positioning of the scraper seat and the top positioning of the tungsten alloy block on the scraper. The positioning arm has a side limiting component and a top limiting component. After the position of the scraper seat is determined, the scraper seat can be fixed by the clamp, and then welding can be carried out. Finally, the position of the scraper meets the design requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the second structure of this utility model;

[0019] Figure 3 This is an exploded view of the present invention;

[0020] Figure 4 This is a schematic diagram of a sliding groove structure according to the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the first segment of the main body of this utility model;

[0022] Figure 6 This is a structural schematic diagram of a splicing segment of the main body of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of an indexing and splicing positioning arm according to this utility model;

[0024] Figure 8 This is a schematic diagram of the third structure of this utility model;

[0025] Figure 9 This is a schematic diagram of the fourth structure of this utility model;

[0026] In the diagram: 1. Positioning pin, 2. Fixing part, 3. Surface bearing, 4. Outer tube, 5. Inner pin, 6. Through hole, 7. Locking tube, 8. Locking and fixing device, 9. Threaded rod, 10. Fixing plate, 11. Diagonal brace, 12. Proximal end, 13. Main body, 14. Support base, 15. Connecting part, 16. Side limiting component, 17. Top limiting component, 18. Positioning arm, 19. Slide plate, 20. Locking screw, 21. Clamping arm, 22. Slide groove structure, 23. Locking limiting plate, 24. Middle part, 25. Hinge shaft, 26. First hinge plate, 27. Second hinge plate, 28. Limiting groove, 29. Plate assembly, 30. Slide groove, 31. Opening, 32. First section, 33. Assembly section. Detailed Implementation

[0027] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings. Example 1

[0028] Figure 8 As shown, a scraper repair welding positioning device includes a positioning post 1 and a positioning arm 18 disposed on the positioning post perpendicular to the axis of the positioning post. The positioning arm has a side limiting component 16 for limiting the side of the scraper and a top limiting component 17 for limiting the top of the scraper.

[0029] The bottom of the positioning column is provided with a fixing part 2 for fixing to the center of the cutter head. The fixing part is disc-shaped and has fixing holes distributed in a circle. The positioning column has a coaxial rotating structure, including an inner column 5 and an outer tube 4. The positioning arm is fixedly connected to the outer tube. A plane bearing 3 is provided on the fixing part. The lower end of the outer tube is connected to the plane bearing, and the plane bearing is sleeved on the inner column.

[0030] The inner column has a coaxial threaded rod 9 at its top. The outer tube is closed at the top and has a through hole 6 for the threaded rod to extend out. A locking device 8 is provided on the part of the threaded rod that extends beyond the top of the outer tube. The locking device adopts a circular rotating disk structure and includes a locking tube 7 with a central internal threaded hole. A radial rod is provided on the outer surface of the locking tube. The end of the radial rod is connected to a handle tube, which is circularly curved. The lower end of the locking tube has a part that contacts the outer surface of the top of the outer tube.

[0031] The positioning arm is fixed perpendicularly to the outer surface of the outer tube. The side limiting component and the top limiting component of the positioning arm are perpendicular to each other. The centerline of the top limiting component is coplanar with the centerline of the positioning post. The inner surface of the side limiting component corresponds to the side position of the scraper on the cutter head to be repaired. A support base 14 is fixed to the upper surface of the top limiting component at the far end of the positioning arm. A fixing plate 10 is fixed to the outer surface of the outer tube. The fixing plate is parallel to the centerline of the positioning post. Multiple connecting holes are provided on the fixing plate. One connecting hole is provided on the support base. A diagonal brace 11 is connected between the fixing plate and the support base. The two ends of the diagonal brace are engaged with the corresponding connecting holes. In this embodiment, the diagonal brace adopts a tensioning device with an adjusting screw sleeve in the middle. Example 2

[0032] like Figure 9 As shown, a scraper repair welding positioning device differs from Embodiment 1 in that the positioning arm includes a proximal end 12 and a main body 13. The proximal end and the main body are connected by an assembly structure. In this embodiment, the proximal end and the main body are connected by an assembly method. The proximal end is fixed vertically to the outer tube, and an assembly plate is fixed to the end of the proximal end. An assembly plate is also fixed to the end of the main body. The two assembly plates are opposite each other and fixed with bolts. The remaining structure is the same as in Embodiment 1.

[0033] Furthermore, such as Figure 6As shown, the main body is composed of multiple splicing segments 33. Each splicing segment includes a central main body and connecting parts 15 fixed to both ends of the central main body. The connecting parts have fixing holes. The connecting parts of adjacent segments face each other, and bolts pass through the fixing holes and are fixed in place. A support seat is provided at the far end of the central main body of each segment. Side limiting components and top limiting components are located at the central main body. The height of the connecting parts is less than the height of the side limiting components, and the fixing holes on the connecting parts avoid the positions of the support seat and the central main body. For ease of connection to the proximal end, the first segment is connected to the proximal end. One end of this first segment is provided with a splicing plate that is connected and fixed to the splicing plate of the proximal end. Example 3

[0034] like Figure 1 As shown, a scraper repair welding positioning device differs from Embodiment 2 in that the proximal end and the main body are connected by a hinge, allowing the main body to rotate relative to the proximal end around the hinge. A first hinge plate 26 is fixed to the end of the proximal end, and two separate hinge seats are provided on the upper part of the first hinge plate. A second hinge plate 27 is fixed to the corresponding end of the main body (e.g., ...). Figure 5 As shown, a hinge seat is provided in the middle of the upper part of the second hinge plate. The hinge seat on the second hinge plate fits perfectly with the space between the two hinge seats on the first hinge plate. The hinge seat has a hinge hole. After the first and second hinge plates are joined together, the hinge hole on the hinge seat is coaxial, and the hinge shaft 26 is inserted into the hinge hole, forming a rotatable connection between the first and second hinge plates. The main body can rotate upward around the hinge part. After rotation, the lever arm of the positioning arm relative to the positioning post is shortened. The remaining structure is as described in Embodiment 2. Example 4

[0035] like Figure 2 Figure 3 Figure 4 As shown, a scraper repair welding positioning device differs from the above embodiment in that the positioning arm has a lifting and moving structure relative to the outer tube.

[0036] A sliding groove structure 22 is provided on the outer tube. The positioning arm slides in conjunction with the sliding groove structure, and a locking device is provided between the positioning arm and the sliding groove structure. The sliding groove structure is welded and fixed by plate assembly 29. The sliding groove structure has a vertically extending sliding groove 30 with a side opening 31. A sliding plate 19 adapted to the sliding groove is provided at the near end of the positioning arm. The sliding plate is T-shaped, and the middle part 24 of the sliding plate mates with the opening of the sliding groove structure. A connecting hole is provided on the middle part. Locking limit plates 23 are provided on both sides of the opening of the sliding groove structure at a slightly lower position. A limit groove 28 is provided in the middle of the locking limit plate. The locking device includes a U-shaped clamping arm 21 and a locking screw 20. Threaded holes are provided at both ends of the clamping arm. The locking screw is fitted into the threaded holes. The height of the limit groove is adapted to the height of the clamping arm. The two ends of the clamping arm are inserted into the limit groove. The inner width of the clamping arm opening is slightly larger than the thickness of the middle part of the sliding plate. The slide plate slides up and down in the slide groove to adjust the height of the top limiting component of the positioning arm. Once the position is determined, the locking screw is screwed into the threaded hole of the clamping arm and clamps the middle part, while being restricted by the limiting groove.

[0037] like Figure 7 As shown, the main body of the positioning arm is composed of multiple splicing segments 33. The first segment 32 is connected to the proximal end. The two ends of the first segment are respectively fixed with a second hinge plate and a connecting part, and the end of the proximal end is fixed with a first hinge plate. The second hinge plate and the first hinge plate are hinged together by a hinge shaft. To extend the length of the positioning arm, splicing segments can be connected to the connecting part of the first segment. As needed, the remaining splicing segments can be connected to each other one by one through corresponding connecting parts. The support seat at the end of each splicing segment is connected and supported by a diagonal brace to the corresponding connecting hole on the middle part of the slide plate.

[0038] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A doctor blade repair welding fixture, comprising: The positioning column is provided with a positioning arm arranged perpendicularly to the axis of the positioning column, the positioning arm is provided with a side limiting part for limiting the side of the scraper, and the positioning arm is provided with a top limiting part for limiting the top of the scraper; the bottom of the positioning column is provided with a fixing part for fixing with the center of the cutter head, the positioning column is a coaxial rotating structure, the positioning column comprises an inner column and an outer tube, and the positioning arm is connected with the outer tube; the inner column and the outer tube are provided with a locking fixing device.

2. A blade repair welding fixture as defined in claim 1, wherein, The fixing part at the bottom of the positioning column is disc-shaped, and is provided with fixing holes arranged in a circle; the fixing part is provided with a plane bearing, the lower end of the outer tube is connected with the plane bearing, and the plane bearing is sleeved on the inner column.

3. A blade repair welding fixture as defined in claim 1 wherein, The top of the inner column is provided with a coaxial threaded rod, the top of the outer tube is closed and provided with a through hole for the threaded rod to extend out, and the part of the threaded rod extending out of the top of the outer tube is provided with the locking fixing device.

4. A blade repair welding positioning device according to claim 1 or 3, wherein The locking fixing device adopts a circular rotating disc structure, the locking fixing device comprises a locking tube with an inner threaded hole in the center, the outer surface of the locking tube is provided with a radial rod, the end of the radial rod is connected with a hand holding tube, the hand holding tube is circularly bent, and the lower end of the locking tube has a part in contact with the outer surface of the top of the outer tube.

5. A blade repair welding positioning device according to claim 1 or 2 or 3, characterized in that The positioning arm comprises a proximal end part and a main body part, and the proximal end part and the main body part are connected in an assembled manner; the proximal end part and the main body part are connected in a hinged manner, and the main body part can rotate relative to the proximal end part about the hinge part. Or the proximal end part and the main body part are connected in a split manner.

6. A blade repair welding fixture as defined in claim 5 wherein, The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device.

7. A blade repair welding fixture as defined in claim 6 wherein, The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device.

8. A blade repair welding fixture as defined in claim 6 wherein, The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device.

9. A blade repair welding fixture as defined in claim 8 wherein, The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device.

10. A blade repair welding fixture as defined in claim 5 wherein, The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device. The proximal end part of the positioning arm is fixed perpendicularly to the outer tube; or the positioning arm is in a lifting and moving mode relative to the outer tube, the outer tube is provided with a sliding groove structure, the positioning arm is in sliding cooperation with the sliding groove structure, and the positioning arm and the sliding groove structure are provided with a locking device.

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