Translation bearing seat welding positioning device

Abstract

The utility model belongs to the technical field of tunnel shield machine manufacturing equipment, and discloses a translation bearing seat welding positioning device which comprises a supporting beam, an adjusting seat is arranged on the outer surface of the supporting beam, lifting lugs are symmetrically arranged on one side of the outer surface of the supporting beam, and bearing fixing blocks are symmetrically arranged at the two ends of the supporting beam in a sliding mode. The supporting beam and the adjusting base are connected in a welded mode, the adjusting base and the lifting lug are made of steel plates, fixing bases are symmetrically arranged on the outer surface of the bearing fixing block, and a threaded rod is connected between each fixing base and the corresponding adjusting base in a threaded and penetrating mode; according to the scheme, by means of methods of auxiliary measurement of a laser measuring instrument, auxiliary adjustment of a bridge crane through a lifting lug and the like, the mounting coaxiality of the two groups of paired translation bearing seats is controlled to be 0.15, the mounting parallelism and planeness of the two groups of translation bearing seats are controlled to be 0.4, and the bearing seat fixing blocks are adjusted to axially move on the shafts through the adjusting screw rods; the purposes of assembling, fixing, precision adjusting, mounting and dismounting of the bearing seat between the fixed large-span fixing rings are achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tunnel shield machine manufacturing equipment, specifically a translation bearing seat welding and positioning device. Background Technology

[0002] The translation bearing housing mainly plays a dual role of support and guidance. During the tunnel boring machine's (TBM) advancement process, it supports key components such as the cutterhead and shield body, and evenly transmits the huge thrust generated by the propulsion system to the entire TBM structure, ensuring that each component operates stably under high pressure. As a key component in the manufacturing process of the TBM, the welding quality of the translation bearing housing directly affects the operational stability and reliability of the TBM.

[0003] However, the following problems were found in the implementation of the relevant technologies:

[0004] In the manufacturing of tunnel boring machines, two sets of paired translation bearing seats need to be connected to the fixed ring by welding. The coaxiality of the same set of translation bearing seats after welding is 0.15, and the parallelism and flatness of the axes of the two sets of translation bearing seats after welding are 0.4. However, due to the large tendency of thermal deformation caused by welding melting, it is quite difficult to ensure the welding accuracy of the two sets of paired translation bearing seats installed on the fixed large-span fixed ring. At the same time, there are certain technical difficulties in assembling, disassembling and adjusting the tooling and translation bearing seats between the fixed large-span fixed ring after assembly. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a welding positioning device for a translational bearing housing. This device ensures that parts can be smoothly and effectively installed in the designated position, while also allowing the bearing housing to be disassembled after installation and used for the assembly of another set of bearing housings. This utility model utilizes the principle that a smooth bushing can slide axially under external force to achieve the goal of effectively installing two sets of bearing housings and controlling welding deformation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a welding and positioning device for a translation bearing seat, comprising a support beam, an adjustment seat on the outer surface of the support beam, and symmetrically provided lifting lugs on one side of the outer surface of the support beam, and bearing fixing blocks symmetrically slidably provided at both ends of the support beam.

[0007] Preferably, the support beam and the adjusting seat are welded together, and the adjusting seat and the lifting lug are made of steel plate.

[0008] Preferably, the outer surface of the bearing fixing block is symmetrically provided with fixing seats, and a screw is threadedly connected between the fixing seats and the adjusting seats. The outer surface of the screw is threaded with a tightening nut, a first adjusting nut and a second adjusting nut.

[0009] Preferably, the tightening nut is movably engaged with the side of the fixing seat away from the lifting lug, and the screw is located between the corresponding tightening nut and the adjusting seat.

[0010] Preferably, a cylindrical hexagonal socket screw is threaded through the inner side of the bearing fixing block, and the thread of the cylindrical hexagonal socket screw penetrates the support beam.

[0011] Preferably, four cylindrical hexagonal screws are provided on one side, and the four cylindrical hexagonal screws are arranged in a ring.

[0012] Preferably, the outer surface of the lug is treated to remove sharp edges and burrs.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model utilizes existing materials to manufacture a welding positioning fixture for translation bearings. It achieves excellent positioning results for product welding. The coaxiality of the first set of bearing seats is 0.12, the coaxiality of the second set is 0.11, the parallelism is 0.3, and the flatness is 0.35. This enables the bearing seats to be assembled, fixed, and installed / disassembled between fixed large-span fixing rings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the support beam structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the bearing fixing block structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the lifting lug structure of this utility model.

[0019] In the diagram: 1. Tightening nut; 2. Fixing seat; 3. Screw; 4. First adjusting nut; 5. Adjusting seat; 6. Second adjusting nut; 7. Support beam; 8. Lifting lug; 9. Bearing fixing block; 10. Cylindrical hexagonal socket screw. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1 to 4As shown, this utility model provides a welding and positioning device for a translational bearing seat, including a support beam 7, an adjusting seat 5 on the outer surface of the support beam 7, and symmetrically arranged lifting lugs 8 on one side of the outer surface of the support beam 7. The outer surface of the lifting lugs 8 is treated to remove sharp edges and burrs. Bearing fixing blocks 9 are symmetrically slidably arranged at both ends of the support beam 7. The support beam 7 and the adjusting seat 5 are welded together, and the adjusting seat 5 and the lifting lugs 8 are made of steel plate. The welding and positioning fixture for the translational bearing seat consists of the support beam 7, the adjusting seat 5 welded to the support beam 7 (evenly distributed at 3 points around the circumference), and the lifting lugs 8 welded to the adjusting seat 5. The support beam 7 is welded together (symmetrically distributed at the center of the support beam 7), the bearing fixing block 9 and the bearing seat fixing block are slidably connected to the support beam 7 (distributed at both ends of the support beam 7), the fixing seat 2 and the bearing fixing block 9 are welded together (evenly distributed at 3 points around the circumference), and the screw 3 (connected by tightening nut 1, fixing seat 2, first adjusting nut 4, adjusting seat 5 and second adjusting nut 6) organically connects the support beam 7 and the bearing fixing block 9 together. The tightening nut 1 and the cylindrical hexagonal screw 10 connect and fix the translation bearing seat to the bearing fixing block 9. Before the translation bearing seat is installed, the above structure must be assembled according to the design drawings to ensure that the bearing fixing block 9, bearing fixing seat 2 and support beam 7 can slide freely and rotate freely around the circumference.

[0022] Specifically, the outer surface of the bearing fixing block 9 is symmetrically provided with fixing seats 2, and a screw 3 is threadedly connected between the fixing seats 2 and the adjusting seats 5. The outer surface of the screw 3 is threaded with a tightening nut 1, a first adjusting nut 4 and a second adjusting nut 6. The tightening nut 1 is movably fitted with the side of the fixing seat 2 away from the lifting lug 8. The screw 3 is located between the corresponding tightening nut 1 and the adjusting seat 5. Before installation, tighten the tightening nuts 1 (on both sides of the fixing seat 2) to fix the screw 3 on the fixing seat 2. Loosen the first adjusting nut 4 and rotate the second adjusting nut 6 to move the bearing fixing block 9 toward the symmetrical center of the support beam 7 until the maximum axial distance between the bearing seat fixing blocks at both ends of the support beam 7 is less than the minimum spacing between the same group of translation bearing seats, so as to ensure that the positioning fixture can be lifted and the bearing fixing block 9 can be smoothly assembled with the translation bearing seat.

[0023] Furthermore, the inner thread of the bearing fixing block 9 is connected to a cylindrical hexagonal socket screw 10, and the cylindrical hexagonal socket screw 10 is threaded through the support beam 7. There are four cylindrical hexagonal socket screws 10 on one side, and the four cylindrical hexagonal socket screws 10 are distributed in a ring. The translation bearing seat is assembled with the fixing ring, and there are directional requirements on the circumference. Therefore, a set of translation bearing seats is first hoisted and matched with the mounting holes, and fixed by floating with pressure plates. The circumferential position of the translation bearing is checked, adjusted and determined by a five-line laser level. Then, using a bridge crane, the welding and positioning fixture for the translation bearing housing is lifted by the lifting lug 8, keeping the axis at the same height as the axes of the two bearing housings. First, the bearing fixing block 9 at one end is fitted with the translation bearing housing with a small clearance. Then, the bearing fixing block 9 is fastened to the translation bearing housing using the tightening nut 1 and the cylindrical hexagonal screw 10. Then, the second adjusting nuts 6 at both ends are loosened, and the first adjusting nut 4 is rotated to move the bearing fixing block 9 and the bearing fixing seat 2 at the other end axially to fit with the translation bearing housing. The two are then fastened together using the tightening nut 1 and the cylindrical hexagonal screw 10. The floating fixing plate is loosened, and the first adjusting nut 4 is rotated to move the bearing fixing block 9 and the bearing fixing seat 2 axially to both ends until the translation bearing housing and the fixing ring mounting surface are completely fitted together, eliminating the gap.

[0024] Furthermore, a laser measuring instrument is used to measure and check the coaxiality of the outer circle of the same group of translation bearing seats. If the coaxiality fails the check once, the first adjusting nut 4 should be loosened, the lifting lug 8 should be lifted by a bridge crane, the horizontal height of the axis of the support beam 7 should be changed, and the tightening sequence of the adjusting nut 4 should be adjusted to improve the coaxiality of the translation bearing seats until the coaxiality inspection is qualified.

[0025] It is worth noting that a low-voltage, low-current, multi-layer cross-welding process was used to control the interlayer temperature to no more than 200°C, thus completing the welding connection between the translation bearing seat and the fixed ring.

[0026] It is worth noting that after the weld has cooled naturally to room temperature for 24 hours, loosen and remove the tightened nut 1, the cylindrical hexagonal screw 10, then loosen the first adjusting nut 4, rotate the second adjusting nut 6, and move the bearing fixing block 9 and the bearing seat fixing block along both ends of the support beam 7 towards the center of symmetry until the maximum axial distance between the bearing fixing blocks 9 and the bearing seat fixing blocks at both ends is less than the minimum distance between the two translation bearing seats. Then, the bridge crane lifts the translation bearing welding positioning fixture, and a laser measuring instrument is used to measure and check the coaxiality of the completed set of translation bearings, and the actual test results are recorded.

[0027] It is worth mentioning that, due to the directional requirements of the translation bearing housing and the fixed ring assembly on the circumference, another set of translation bearing housings is hoisted and matched with the mounting holes of the fixed ring using the same method. A floating fixation plate is used, and a five-line laser level is used to check, adjust, and determine the circumferential position of the translation bearing. Then, a bridge crane is used to lift the translation bearing housing welding positioning fixture via the lifting lug 8, keeping the axis at the same height as the two bearing housings. First, after ensuring a small clearance fit between the bearing fixing block 9 (bearing housing fixing block) and the translation bearing housing, the bearing fixing block 9 (bearing housing fixing block) and the translation bearing housing are fastened together using the tightening nut 1 and the cylindrical hexagonal screw 10. Then, the second adjusting nuts 6 at both ends are loosened, and the first adjusting nut 4 is rotated to move the other end of the bearing fixing block 9 (bearing housing 2) axially to match and install it with the translation bearing housing. The two are then fastened together using the tightening nut 1 and the cylindrical hexagonal screw 10. The floating fixation plate is then loosened, and the process continues... Rotate the first adjusting nut 4 to move the bearing fixing block 9 and bearing fixing seat 2 axially to both ends until the translation bearing seat and the fixing ring mounting surface are completely in contact, eliminating the gap; use a laser measuring instrument to measure and check the coaxiality of the outer circle of this group of translation bearing seats, and at the same time check the parallelism and flatness of the axes of the two groups of bearing seats. If the inspection fails once, loosen the first adjusting nut 4, use a bridge crane to lift the lifting lug 8, change the horizontal height of the axis of the support beam 7, and adjust the tightening sequence of the adjusting nut 4 to improve the coaxiality of the translation bearing seats until the coaxiality, parallelism and flatness inspections are qualified.

[0028] It is worth emphasizing that a low-voltage, low-current, multi-layer cross-welding process was adopted to control the interpass temperature to no more than 200°C, and the welding connection between the translation bearing seat and the fixed ring was completed. After the weld has cooled naturally to room temperature for 24 hours, the cylindrical hexagonal screw 10 of the tightened nut 1 was loosened, removed, and then the first adjusting nut 4 was loosened. The second adjusting nut 6 was rotated, and the bearing fixing block 9 and the bearing seat fixing block were moved along both ends of the support beam 7 towards the center of symmetry until the maximum axial distance between the bearing fixing blocks 9 and the bearing seat fixing blocks at both ends was less than the minimum distance between the two translation bearing seats. Then, the bridge crane lifted the translation bearing welding positioning fixture. A laser measuring instrument was used to measure and check the coaxiality, parallelism, and flatness of the two sets of translation bearings that had been welded, and the actual test results were recorded.

[0029] Working principle: By tightening and securing nut 1 to fix screw 3, loosening the first adjusting nut 4, and rotating the second adjusting nut 6, the bearing housing fixing blocks move towards the center of symmetry on the support beam 7 using the principle of thread transmission. Reducing the spacing between the bearing housing fixing blocks is to meet the dimensional requirements for lifting the positioning fixture and assembling it with the translation bearing housing, thus facilitating subsequent installation operations.

[0030] For assembly and positioning, the translation bearing housing and the fixed ring have circumferential requirements. A five-line laser level is used to determine the circumferential position, based on the linear propagation of laser light and the horizontal reference characteristics, to ensure accurate installation angle of the translation bearing housing. The positioning fixture is lifted by the lifting lug 8 of a bridge crane, keeping the axis at the same height. First, one end of the bearing housing fixing block is fitted with the translation bearing housing with a small clearance and tightened. Then, the other end of the fixing block is moved by the first adjusting nut 4 for assembly. This utilizes the threaded engagement between the adjusting nut and the screw 3 to achieve axial movement, achieving precise assembly and positioning, and ensuring that the installation surfaces of the translation bearing housing and the fixed ring are in close contact.

[0031] Welding precision control employs a laser measuring instrument to measure coaxiality, parallelism, and flatness. This utilizes the high-precision measurement capabilities of lasers to provide real-time feedback on positional accuracy before and during welding. When coaxiality is unacceptable, the first adjusting nut 4 is loosened, and the height of the support beam 7's axis is adjusted using a bridge crane, combined with the tightening sequence of the adjusting nuts. By changing the position of the support beam 7, the bearing seat position is indirectly adjusted, thereby improving coaxiality and ensuring welding precision.

[0032] Welding processes employ low voltage, low current, and multi-layer cross-welding techniques, with interpass temperatures controlled to not exceed 200°C, to reduce heat input and minimize thermal deformation. Low voltage and low current reduce heat generation, multi-layer cross-welding disperses heat, and controlling interpass temperatures prevents localized overheating and avoids thermal deformation affecting welding accuracy.

[0033] After welding and disassembly, and after 24 hours of cooling, loosen the cylindrical hexagonal screws 10, then loosen the first adjusting nut 4 and rotate the second adjusting nut 6 to move the bearing seat fixing blocks along the support beam 7 towards the center of symmetry. By using the opposite adjustment operation to that before installation, reduce the distance between the fixing blocks to less than the minimum distance between the two translated bearing seats, making it easier for the bridge crane to lift the positioning fixture, thus enabling the fixture to be disassembled and reused.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding and positioning device for a translation bearing seat, comprising a support beam (7), characterized in that: The outer surface of the support beam (7) is provided with an adjustment seat (5), and a lifting lug (8) is symmetrically provided on one side of the outer surface of the support beam (7). Bearing fixing blocks (9) are symmetrically slidably provided at both ends of the support beam (7).

2. The translation bearing seat welding positioning device according to claim 1, characterized in that: The support beam (7) and the adjusting seat (5) are welded together, and the adjusting seat (5) and the lifting lug (8) are made of steel plate.

3. The translation bearing seat welding positioning device according to claim 2, characterized in that: The outer surface of the bearing fixing block (9) is symmetrically provided with fixing seats (2), and a screw (3) is threadedly connected between the fixing seat (2) and the adjusting seat (5). The outer surface of the screw (3) is threaded with a tightening nut (1), a first adjusting nut (4) and a second adjusting nut (6).

4. The translation bearing seat welding positioning device according to claim 3, characterized in that: The tightening nut (1) is movably fitted to the side of the fixed seat (2) away from the lifting lug (8), and the screw (3) is located between the corresponding tightening nut (1) and the adjusting seat (5).

5. The translation bearing seat welding positioning device according to claim 4, characterized in that: The inner thread of the bearing fixing block (9) is connected to a cylindrical hexagonal screw (10), and the cylindrical hexagonal screw (10) is threaded through the support beam (7).

6. The translation bearing seat welding positioning device according to claim 5, characterized in that: There are four cylindrical hexagonal screws (10) on one side, and the four cylindrical hexagonal screws (10) are arranged in a ring.

7. The translation bearing seat welding positioning device according to claim 6, characterized in that: The outer surface of the lug (8) is treated to remove sharp edges and burrs.

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