A large water-lubricated bearing plate cold mounting process

Abstract

The present application relates to large ship propulsion system technical field, specifically relates to a kind of large water-lubricated bearing strip cold mounting process.Combining the thermal expansion characteristics of high molecular strip material and the processing characteristics of strip, the cold mounting process of the overall splicing type water-lubricated bearing is determined, which can prevent the dislocation of the overall splicing type strip of large water-lubricated bearing during cold mounting, effectively guarantee the splicing quality between the strips after cold mounting;Combining the water channel distribution characteristics of water-lubricated bearing, the water channel guide tool during the cold mounting of water-lubricated bearing is designed, which is beneficial to the circumferential positioning of the bearing strip during cold mounting;Full-thread stud and lock nut are provided during installation, and the strip is positioned by the designed cold mounting guide tool, which guarantees the centring of the strip water channel during the cold mounting process of the strip.

Description

Technical Field

[0001] This invention relates to the field of large ship propulsion system technology, specifically to a cold-fitting process for large water-lubricated bearing slats. Background Technology

[0002] The bearing shell of a large water-lubricated bearing is made up of multiple strips spliced ​​together. To ensure the stability of the bearing shell after splicing, an interference fit can be used to assemble the strips and bushings. The interference fit process is a cold assembly.

[0003] For large water-lubricated bearings, the overall length of the bearing shell is relatively long. To reduce the processing difficulty of the long strips, the bearing shell is composed of three sections spliced ​​together axially and multiple strips spliced ​​together circumferentially. The water groove of the water-lubricated bearing is formed by splicing together strips.

[0004] The existing water-lubricated bearing slat assembly process has errors in slat processing. The cumulative errors in slat processing may cause axial misalignment of the water tank, which seriously affects the cooling water flow and sand removal function of the water-lubricated bearing water tank. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cold assembly process for large water-lubricated bearing slats, which can ensure the alignment of the water grooves in the slats during the cold assembly process and effectively improve the assembly quality of large water-lubricated bearing slats.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a cold-fitting process for large water-lubricated bearing slats, mainly including the following steps:

[0008] S1, Slat pre-assembly: According to the preset arrangement order, the processed slats are sequentially installed into the upper half bushing and the lower half bushing of the bearing.

[0009] S2, Alignment of water channels in multi-segment bearing slats: Visually inspect the alignment of the water channels in the three axial bearing slats. If they are not aligned, adjust the circumferential arrangement of the slats until the water channels in the three bearing slats are visually free of any deviation.

[0010] S3, End strip interference detection: The interference of the end strip relative to the bearing bushing is detected by end face comparison, and the size of the end strip is adjusted according to the detection results;

[0011] S4, Sequentially number the slats: Number and mark each slat according to its axial and circumferential order;

[0012] S5, Slab pre-cooling: According to the slab numbering sequence, put all the slabs into liquid nitrogen and freeze for 90 minutes, then take them out one by one;

[0013] S6, Assembly of upper bushing strips of bearing: Multiple upper bushing positioning fixtures are used in conjunction with corresponding threaded studs to assemble and position the inner strips of the upper bushing of the bearing.

[0014] S7, Assembly of the lower bushing strip of the bearing: Multiple lower bushing positioning tools are used in conjunction with corresponding full-thread studs to assemble and position the inner strip of the lower bushing of the bearing.

[0015] S8, Slat hammering: After the slats are assembled, a pressure iron is added to the corresponding positioning fixture. As the slats return to room temperature, they are continuously hammered with a nylon hammer to guide them to expand evenly to release thermal stress and ensure that the slats are pressed tightly together.

[0016] Preferably, in step S1, the upper bearing bush 4 and the lower bearing bush 5 are each provided with three sections of bearing strips along the axial direction, namely the front bearing strip group 1, the middle bearing strip group 2 and the rear bearing strip group 3.

[0017] Preferably, each bearing slat assembly consists of two end slats 6 and multiple middle slats 7. The end slats 6 are installed at a position flush with the end face of the corresponding bearing half bushing, and the multiple middle slats 7 are installed between the two end slats 6 inside the corresponding bearing half bushing, with a slat groove 8 formed between adjacent slats.

[0018] Preferably, in step S3, the interference fit detection of the end strip specifically includes:

[0019] S31. Compare the height difference between the bearing half bushing and the end face of the inner end plate of the bushing to determine the interference fit of the end plate relative to the bearing half bushing.

[0020] S32, when the interference is greater than the preset maximum value of the interference range, the corresponding end strip wedge surface size is trimmed;

[0021] S33, when the interference is less than the preset minimum interference range, the corresponding end strip is reprocessed.

[0022] Preferably, in step S4, the bearing bush strips are numbered sequentially according to the rear section, middle section, and front section. Then, the strips in the upper and lower bearing bushes are numbered sequentially according to the left end strip, middle strip, and right end strip.

[0023] Preferably, in step S5, the order in which the slats are placed into liquid nitrogen is the reverse of the order in which the slats are assembled in subsequent steps.

[0024] Preferably, in step S6, each section of bearing slats in the upper bushing 4 is circumferentially positioned using two parallel upper bushing positioning fixtures 9, and the guide teeth size and distribution of the upper bushing positioning fixtures 9 are adapted to the slat water grooves in the upper bushing 4.

[0025] Preferably, the upper bearing positioning fixture 9 has a screw guide hole 11 for passing through the full-thread stud, and the length of the full-thread stud is adapted to the total length of the three bearing strips in the upper bushing 4.

[0026] Preferably, in step S7, each section of bearing slats in the lower bearing bush 5 is circumferentially positioned using two parallel lower bearing positioning fixtures 10, and the guide teeth size and distribution of the lower bearing positioning fixtures 10 are adapted to the slat water grooves in the lower bearing bush 5.

[0027] Preferably, the lower bearing positioning fixture 10 has a screw guide hole 2 12 for passing through the full-thread stud 2, and the length of the full-thread stud 2 is adapted to the total length of the three bearing strips in the lower bushing 5.

[0028] Compared with the prior art, the present invention has the following main advantages:

[0029] 1. This invention combines the thermal expansion characteristics of polymer strip materials and the processing characteristics of strips to determine the cold assembly process of integral splicing water-lubricated bearings. This can prevent misalignment of integral splicing strips of large water-lubricated bearings during cold assembly and effectively ensure the splicing quality between strips after cold assembly.

[0030] 2. This invention, taking into account the distribution characteristics of the water grooves in water-lubricated bearings, designs a water groove guiding fixture for cold assembly of water-lubricated bearings, which helps to ensure the circumferential positioning of bearing slats during cold assembly.

[0031] 3. The present invention incorporates fully threaded studs and locking nuts during installation, and uses a designed cold-installation guide fixture to position the slats, ensuring the alignment of the slat water trough during the cold installation process. Attached Figure Description

[0032] Figure 1 This is a process flow diagram of the cold assembly process for large water-lubricated bearing slats in an embodiment of the present invention;

[0033] Figure 2 This is an assembly diagram of the spliced ​​bearing strips and bushings in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the spliced ​​bearing strip structure in an embodiment of the present invention;

[0035] Figure 4This is a schematic diagram of the upper tile positioning fixtures (6 in total) in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the lower tile positioning fixtures (6 in total) in an embodiment of the present invention.

[0037] In the diagram: 1. Front bearing slat assembly; 2. Middle bearing slat assembly; 3. Rear bearing slat assembly; 4. Upper bearing bushing; 5. Lower bearing bushing; 6. End slats; 7. Middle slats; 8. Slat water groove; 9. Upper bearing bushing positioning fixture; 10. Lower bearing bushing positioning fixture; 11. Screw guide hole one; 12. Screw guide hole two. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0039] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0040] Example 1: This example provides a cold assembly process for large water-lubricated bearing slats, used to achieve integral splicing of slats for large ship water-lubricated bearings.

[0041] like Figure 1 As shown, the main process flow is as follows:

[0042] S1, Slat pre-assembly: According to the preset arrangement order, the processed slats are sequentially installed into the upper half bushing and the lower half bushing of the bearing.

[0043] S2, Alignment of water channels in multi-segment bearing slats: Visually inspect the alignment of the water channels in the three axial bearing slats. If they are not aligned, adjust the circumferential arrangement of the slats until the water channels in the three bearing slats are visually free of any deviation.

[0044] S3, End strip interference detection: The interference of the end strip relative to the stop copper strip is detected by end face comparison, and the size of the end strip is adjusted according to the detection results;

[0045] S4, Sequentially number the slats: Number and mark each slat according to its axial and circumferential order;

[0046] S5, Slab pre-cooling: According to the slab numbering sequence, put all the slabs into liquid nitrogen and freeze for 90 minutes, then take them out one by one;

[0047] S6, Assembly of upper bushing strips of bearing: Multiple upper bushing positioning fixtures are used in conjunction with corresponding threaded studs to assemble and position the inner strips of the upper bushing of the bearing.

[0048] S7, Assembly of the lower bushing strip of the bearing: Multiple lower bushing positioning tools are used in conjunction with corresponding full-thread studs to assemble and position the inner strip of the lower bushing of the bearing.

[0049] S8, Slat hammering: After the slats are assembled, a pressure iron is added to the corresponding positioning fixture. As the slats return to room temperature, they are continuously hammered with a nylon hammer to guide them to expand evenly to release thermal stress and ensure that the slats are pressed tightly together.

[0050] like Figures 2-5 As shown, in step S1, the upper bearing bush 4 and the lower bearing bush 5 are each provided with three bearing slat groups along the axial direction, namely the front bearing slat group 1, the middle bearing slat group 2 and the rear bearing slat group 3; each bearing slat group consists of two end slats 6 and multiple middle slats 7. The end slats 6 are installed at a position flush with the corresponding stop copper strip, and the multiple middle slats 7 are installed between the two end slats 6 in the corresponding bearing bush, and a slat groove 8 is formed between adjacent slats.

[0051] Furthermore, in step S3, the interference fit detection of the end strip specifically includes:

[0052] S31. Compare the height difference between the stop copper strip and the end face of the inner end plate of the bushing to determine the interference fit of the end plate relative to the bearing half bushing.

[0053] S32, when the interference is greater than the preset maximum value of the interference range, the corresponding end strip wedge surface size is trimmed;

[0054] S33, when the interference is less than the preset minimum interference range, the corresponding end strip is reprocessed.

[0055] Furthermore, in step S4, the bearing bush strips are numbered sequentially according to the rear section, middle section, and front section. Then, the strips in the upper and lower bearing bushes are numbered sequentially according to the left end strip, middle strip, and right end strip.

[0056] Furthermore, in step S5, the order in which the slats are placed into liquid nitrogen is the reverse of the assembly order of the slats in subsequent steps.

[0057] Furthermore, in step S6, each section of bearing slats in the upper bushing 4 is circumferentially positioned using two parallel upper bushing positioning fixtures 9. The guide teeth of the upper bushing positioning fixtures 9 are adapted to the slat water grooves in the upper bushing 4. The upper bushing positioning fixtures 9 are provided with a screw guide hole 11 for passing through the full-thread stud. The length of the full-thread stud is adapted to the total length of the three sections of bearing slats in the upper bushing 4.

[0058] Furthermore, in step S7, each section of bearing slats in the lower bearing bush 5 is circumferentially positioned using two parallel lower bearing positioning fixtures 10. The guide teeth of the lower bearing positioning fixtures 10 are adapted to the slat water grooves in the lower bearing bush 5. The lower bearing positioning fixtures 10 are provided with a screw guide hole 2 12 for passing through the full-thread stud 2. The length of the full-thread stud 2 is adapted to the total length of the three sections of bearing slats in the lower bearing bush 5.

[0059] Example 2: This example provides a cold-fitting process for large water-lubricated bearing slats, which also includes the following features:

[0060] 1. Pre-assembly of slats

[0061] According to the preset arrangement order, the slats are pre-installed in the upper and lower bushings of the water-lubricated bearing. During pre-installation, the interference fit of the last slat (end slat) a in both the upper and lower halves is checked by comparing the end faces to ensure that the interference fit is within the preset range. If the interference fit is too large, the wedge surface of the slat is trimmed; if the interference fit is too small, the end slat a is re-machined.

[0062] In addition, before the end strip a is installed, the alignment of the three axial strip water channels is checked by visual inspection. If there is obvious misalignment of the water channels, the order of the strips in the circumferential direction is adjusted until the water channels of the three strips are visually inspected without obvious deviation.

[0063] After pre-assembly, each strip is numbered to determine its axial and circumferential order.

[0064] 2. Refrigeration installation

[0065] 1) Cold assembly of the upper part of the water-lubricated bearing

[0066] The upper part of the water-lubricated bearing bushing is placed horizontally on the support block with the opening facing upwards. To prevent the bushing from rotating, a stop block is installed on the support block.

[0067] The slats are pre-placed in liquid nitrogen in sequence, with the order being: rear axial slats, middle axial slats, and front axial slats, considering the subsequent installation order. After all slats are placed in liquid nitrogen and frozen for 90 minutes, they are removed one by one and then arranged in the pre-installed order, starting from the bottom stop of the upper bushing, to form a cylindrical slat assembly. During the arrangement process, positioning guide plates are used to guide the position of the water tank, ensuring proper alignment.

[0068] Each row of slats is circumferentially positioned using two upper tile positioning fixtures, with a total of three rows and six upper tile positioning fixtures. The shape and angle of the guide teeth of the positioning fixtures match the size and distribution of the slat water channel. Using a full-threaded stud of the same length as the total length of the three rows of slats, passing through the screw guide hole of the positioning fixture, and using nuts to sequentially tighten the six positioning fixtures along the axis, the slats are positioned circumferentially and axially, preventing misalignment of multiple rows of slats axially.

[0069] After assembly, a weight is added to the positioning fixture. As the slats return to room temperature, they are continuously struck with a nylon hammer. The weight of the nylon hammer and the weight guides the slats to expand.

[0070] 2) Cold assembly of the lower half of the water-lubricated bearing

[0071] Referring to the cold mounting method for the upper part of a water-lubricated bearing, the lower part of the water-lubricated bearing is cold mounted using 6 lower bearing positioning fixtures.

[0072] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0073] In summary:

[0074] 1. This invention combines the thermal expansion characteristics of polymer strip materials and the processing characteristics of strips to determine the cold assembly process of integral splicing water-lubricated bearings. This can prevent misalignment of integral splicing strips of large water-lubricated bearings during cold assembly and effectively ensure the splicing quality between strips after cold assembly.

[0075] 2. This invention, taking into account the distribution characteristics of the water grooves in water-lubricated bearings, designs a water groove guiding fixture for cold assembly of water-lubricated bearings, which helps to ensure the circumferential positioning of bearing slats during cold assembly.

[0076] 3. The present invention incorporates fully threaded studs and locking nuts during installation, and uses a designed cold-installation guide fixture to position the slats, ensuring the alignment of the slat water trough during the cold installation process.

[0077] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cold-fitting process for large water-lubricated bearing slats, characterized in that, Includes the following steps: S1, Slat pre-assembly: According to the preset arrangement order, the processed slats are sequentially installed into the upper half bushing and the lower half bushing of the bearing. S2, Alignment of water channels in multi-segment bearing slats: Visually inspect the alignment of the water channels in the three axial bearing slats. If they are not aligned, adjust the circumferential arrangement of the slats until the water channels in the three bearing slats are visually free of any deviation. S3, End strip interference detection: The interference of the end strip relative to the bearing bushing is detected by end face comparison, and the size of the end strip is adjusted according to the detection results; S4, Sequentially number the slats: Number and mark each slat according to its axial and circumferential order; S5, Slat pre-cooling: According to the slat numbering sequence, put all the slats into liquid nitrogen and freeze for 90 minutes, then take them out one by one; S6, Assembly of upper bushing strips of bearing: Multiple upper bushing positioning fixtures are used in conjunction with corresponding threaded studs to assemble and position the inner strips of the upper bushing of the bearing. S7, Assembly of the lower bushing strip of the bearing: Multiple lower bushing positioning tools are used in conjunction with corresponding full-thread studs to assemble and position the inner strip of the lower bushing of the bearing. S8, Slat hammering: After the slats are assembled, a pressure iron is added to the corresponding positioning fixture, and while the slats are returning to room temperature, the slats are continuously hammered with a nylon hammer to guide the slats to expand evenly and press them together.

2. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S1, the upper half bushing (4) and the lower half bushing (5) of the bearing are provided with three sections of bearing strips along the axial direction, namely the front section bearing strip group (1), the middle section bearing strip group (2) and the rear section bearing strip group (3).

3. The cold-fitting process for large water-lubricated bearing slats according to claim 2, characterized in that, Each bearing slat assembly consists of two end slats (6) and multiple middle slats (7). The end slats (6) are installed at a position flush with the end face of the corresponding bearing half bushing. The multiple middle slats (7) are installed between the two end slats (6) inside the corresponding bearing half bushing, and a slat water groove (8) is formed between adjacent slats.

4. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S3, the interference fit detection of the end strip specifically includes: S31. Compare the height difference between the bearing half bushing and the end face of the inner end plate of the bushing to determine the interference fit of the end plate relative to the bearing half bushing. S32, when the interference is greater than the preset maximum value of the interference range, the corresponding end strip wedge surface size is trimmed; S33, when the interference is less than the preset minimum interference range, the corresponding end strip is reprocessed.

5. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S4, the bearing bush strips are numbered sequentially according to the rear section, middle section, and front section. Then, the strips in the upper and lower bearing bushes are numbered sequentially according to the left end strip, middle strip, and right end strip.

6. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S5, the order in which the slats are placed into liquid nitrogen is the reverse of the assembly order of the slats in subsequent steps.

7. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S6, each section of bearing slats in the upper bushing (4) of the bearing is circumferentially positioned by two parallel upper bushing positioning fixtures (9). The guide teeth size and distribution of the upper bushing positioning fixtures (9) are adapted to the slat water grooves in the upper bushing (4) of the bearing.

8. The cold-fitting process for large water-lubricated bearing slats according to claim 7, characterized in that, The upper bearing positioning fixture (9) is provided with a screw guide hole (11) for passing through the full-thread stud. The length of the full-thread stud is adapted to the total length of the three bearing strips in the upper bushing (4).

9. The cold-fitting process for large water-lubricated bearing slats according to claim 1, characterized in that... In step S7, each section of bearing slats in the lower half bushing (5) is circumferentially positioned using two parallel lower bushing positioning fixtures (10). The guide teeth size and distribution of the lower bushing positioning fixtures (10) are adapted to the slat water grooves in the lower half bushing (5).

10. A cold-fitting process for large water-lubricated bearing slats according to claim 9, characterized in that, The lower bearing positioning fixture (10) has a screw guide hole (12) for passing through the full-thread stud. The length of the full-thread stud is adapted to the total length of the three bearing strips in the lower bushing (5).

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