Oil retainer fastening device for bearing box and disassembly and installation method of bearing box upper cover

Abstract

The present invention discloses an oil baffle fastening device for a bearing box and a method for disassembling and installing an upper cover of a bearing box, comprising a detachable top fixing device, an axial oil return groove and a ball lifting screw arranged on the middle dividing surface of a lower bearing box; the detachable top fixing device fixes the upper cover of the bearing box to the upper oil seal. The joint surfaces where the upper cover of the bearing box and the lower bearing box meet are respectively installed with ball lifting screws, and the balls of the ball lifting screws are located in the axial oil return groove on the lower bearing box and can move along it; the upper cover of the bearing box and the middle dividing surface of the lower bearing box are connected and fixed by two groups of fastening screws. The present invention changes the process sequence of disassembling the bearing box by changing the traditional connection method between the oil seal in the bearing box and the upper cover of the bearing box, and completes the inspection and disassembly of the bearing box and its components without disassembling the auxiliary process pipeline, thereby avoiding the damage of components such as flange fasteners and gaskets caused by repeated disassembly of the auxiliary process pipeline, saving spare parts costs and labor costs.

Description

Technical Field

[0001] The invention belongs to the field of mechanical manufacturing in the petrochemical industry, and in particular relates to an oil baffle fastening device for a bearing box and a method for disassembling and installing an upper cover of a bearing box. Background Art

[0002] In the centrifugal compressor in the field of petrochemical industry machinery manufacturing, the bearing box is locked on the end face of the casing 1 by bolts, and the upper oil seal 5 in the bearing box is fastened to the bearing box cover 7 by two slotted large cylindrical head screws 6 set on both sides. The structural principle is shown in Figure 1-Figure 3 . During routine maintenance of compressor bearing components or dry gas seals, the lower bearing box 4 is fixed to the housing 1 as a rotor support component, and the bearing box upper cover 7 needs to be disassembled before the maintenance work inside the bearing box can be completed. When disassembling this structure, all (one or more) auxiliary process pipelines 2 arranged above the bearing box are usually removed first, and the auxiliary process pipelines 2 are blocked as necessary before the bearing box upper cover 7 can be lifted vertically for disassembly; after the maintenance work is completed, the bearing box upper cover 7 is lifted vertically on the bearing box, and the removed auxiliary process pipeline 2 can be installed after the reinstallation is completed and the connectors are tightened. If there are special requirements for the auxiliary process pipeline, the auxiliary process pipeline must also be cleaned accordingly.

[0003] In the above method, the work of disassembling and assembling auxiliary process pipelines accounts for almost half of the disassembly and assembly workload. Repeated disassembly and assembly of auxiliary process pipelines often causes damage to components such as fasteners and seals on the pipelines, which becomes a considerable cost for maintenance work. Secondly, during the disassembly and assembly process, if some auxiliary process pipelines have special process media, the system needs to isolate and replace the process media during disassembly, and also needs to replace the gas in the auxiliary process pipelines during restoration; in addition, the disassembly process may cause pollution to the auxiliary process pipelines. If the auxiliary process pipelines require purification treatment such as degreasing, the workload and cost will be greater. Summary of the invention

[0004] In view of the problems of pollution of auxiliary process system pipelines, heavy workload and high cost of component damage during daily inspection and disassembly of the bearing box cover of the bearings and dry gas seals due to the structural design of the above-mentioned compressor, one object of the present invention is to provide an oil baffle fastening device for the bearing box.

[0005] An oil baffle fastening device for a bearing box, comprising a detachable top fixing device, two axial oil return grooves arranged on the middle dividing surface of the lower bearing box and at least four ball lifting screws; wherein the detachable top fixing device fixes the top of the bearing box upper cover to the upper oil seal, and the two end surfaces where the bearing box upper cover and the lower bearing box meet are respectively installed with at least two ball lifting screws, the balls of the ball lifting screws are located in the axial oil return grooves and can move along them, and when the ball lifting screws are lifted, they can drive the bearing box upper cover to move upward and separate from the lower bearing box, and when the ball lifting screws are loosened, the bearing box upper cover and the middle dividing surface of the lower bearing box fit together; the bearing box upper cover and the middle dividing surface of the lower bearing box are connected and fixed by two sets of fastening screws.

[0006] Furthermore, the structure of the removable top fixing device includes a threaded hole arranged on the top of the upper oil seal, a positioning screw, a threaded through hole arranged on the top of the bearing box upper cover, and a concave screw plug; wherein, the center of the threaded through hole on the top of the bearing box upper cover corresponds to the center of the threaded hole of the upper oil seal in upper and lower directions; the positioning screw passes through the threaded through hole of the bearing box upper cover and is screwed into the threaded hole of the upper oil seal, the concave screw plug is fixed on the threaded through hole and the upper end of the positioning screw extends into the concave hole of the concave screw plug, thereby realizing relative fixation of the bearing box upper cover and the upper oil seal.

[0007] Furthermore, two ball lifting screws are respectively installed on the center dividing surfaces on both sides where the upper cover of the bearing box and the lower bearing box are connected.

[0008] Furthermore, the outer edge of the upper oil seal is embedded in an oil seal positioning groove provided on the inner wall of the bearing box upper cover to achieve axial positioning of the upper oil seal.

[0009] Furthermore, the diameter of the positioning screw is smaller than the thickness of the upper oil sealing sheet, and the thickness of the upper oil sealing sheet is ≥6 mm.

[0010] Furthermore, the positioning screw is higher than the top of the threaded through hole on the upper cover of the bearing box, and the height value is 15 mm.

[0011] Furthermore, a combined gasket is provided between the concave screw plug and the upper cover of the bearing box.

[0012] Furthermore, a lifting ring is installed on the top of the bearing box upper cover.

[0013] Another object of the present invention is to provide a method for disassembling a bearing box upper cover using the bearing box oil retainer fastening device of the present invention, comprising the following steps:

[0014] Step 1: Remove the concave screw plug on the top of the bearing box cover, use a wrench to clamp the upper end of the positioning screw and rotate it until it is removed from the upper oil seal;

[0015] Step 2, remove the fastening screws on the middle surface of the bearing box, and use the ball lifting screws to lift the upper cover of the bearing box;

[0016] Step 3: After the upper oil seal falls due to gravity and separates from the oil seal positioning groove, move the bearing box upper cover away from the casing 1, and slide the ball lifting screw in the axial oil return groove until the lifting ring reaches the vertical lifting position to avoid interference from auxiliary process pipelines, and use a lifting machinery to lift the bearing box upper cover to complete the removal operation.

[0017] Another object of the present invention is to provide a method for installing a bearing box upper cover using the bearing box oil retainer fastening device of the present invention, comprising the following steps:

[0018] Step 1, completely fit the middle surface of the upper oil seal piece with the middle surface of the lower oil seal piece;

[0019] Step 2: Pre-screw all ball lifting screws to make them in a lifted state, use a lifting device to place the upper cover of the bearing box on the lower bearing box, make the balls of all the lifting screws located in the axial oil return grooves on the lower bearing box, and apply sealant on the inner end surface of the upper cover of the bearing box;

[0020] Step 3, using the ball lifting screw as a supporting sliding point, axially move the upper cover of the bearing box along the axial oil return groove until the middle dividing surfaces of the upper cover of the bearing box and the lower bearing box correspond to each other in the upper and lower directions;

[0021] Step 4: Use the positioning screw as a guide to make the upper oil seal completely fit with the oil seal positioning groove inside the bearing box upper cover, and apply sealant on the middle surface of the lower bearing box on both sides of the axial oil return groove;

[0022] Step 5: Loosen all ball lifting screws to make the center planes of the upper cover of the bearing box and the lower bearing box fit together;

[0023] Step 6, tighten the fastening screws on the center dividing surfaces on both sides of the center axis of the bearing box;

[0024] Step 7, confirm that the positioning screw is installed and tightened in place; place the combined gasket;

[0025] Step 8, make the upper end of the positioning screw be located in the inner hole of the concave screw plug, install the concave screw plug in the threaded through hole at the top of the bearing box upper cover and tighten it to complete the installation operation.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention changes the connection mode between the oil seal and the upper cover of the bearing box in the traditional bearing box, thereby changing the process sequence of disassembly and assembly of the bearing box, and realizing the maintenance of the bearing box and its internal components without disassembling the pipeline of the auxiliary process system of the centrifugal compressor, thereby avoiding damage to components such as pipeline flange fasteners and gaskets caused by repeated disassembly and assembly of the compressor auxiliary connection system pipeline, and saving the cost of process gas line spare parts. At the same time, it avoids contamination during pipeline disassembly, and avoids the cleaning and cleaning before replacement and reinstallation for some special medium gas pipelines. It greatly shortens the disassembly and installation cycle of the bearing box, improves the efficiency of on-site maintenance, and is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following detailed description, but do not constitute a limitation of the present disclosure.

[0029] Figure 1 It is a schematic diagram of the assembly of the upper cover and the upper oil seal of the bearing box in a traditional centrifugal compressor;

[0030] Figure 2 The schematic diagram of the installation of the oil seal is shown in Figure 1, where (a) is Figure 1 Schematic diagram of the installation of the oil seal shown in the AA direction; (b) is a partial enlarged view of (a).

[0031] Figure 3 It is a structural schematic diagram of the oil retainer fastening device for the bearing box of the present invention;

[0032] Figure 4 for Figure 3 A partial enlarged view of the right part;

[0033] Figure 5 It is a schematic diagram (top view) of setting the axial oil return groove on the center plane of the lower bearing box;

[0034] Figure 6 Schematic diagram of the installation of the ball lifting screw, where (a) shows the loosened state of the ball lifting screw and (b) shows the lifted state of the ball lifting screw.

[0035] Figure 7 This is a schematic diagram of installing a concave screw plug on the top of the bearing box cover;

[0036] Figure 8 It is a structural schematic diagram of the positioning screw body;

[0037] Fig. 9 Schematic diagram of the bearing box cover installation process.

[0038] The meaning of each number in the figure is as follows: 1. Compressor casing; 2. Auxiliary process pipeline; 3. Bearing; 4. Lower bearing box; 5. Upper oil seal; 6. Slotted large cylindrical head screw; 7. Bearing box cover; 8. Lifting ring; 9. Connecting flange; 10. Half coupling; 11. Ball lifting screw; 12. Concave wire plug; 13. Positioning screw; 14. Lower oil seal; 15. Center split surface fastening screw; 16. Oil seal positioning groove; 17. Gasket; 18. Axial oil return groove; 19. Combined gasket.

[0039] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0040] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0041] like Figure 3 , Figure 4 and Figure 5 As shown, the oil baffle fastening device for the bearing box provided by the present invention comprises a detachable top fixing device, two axial oil return grooves 18 arranged on the middle dividing surface of the lower bearing box 4, and at least four ball lifting screws 11; wherein, the detachable top fixing device fixes the top of the bearing box upper cover 7 with the top of the upper oil seal 5, and at least two ball lifting screws 11 are respectively installed on the two side joint surfaces where the bearing box upper cover 7 and the lower bearing box 4 are connected, and the balls of the ball lifting screws 11 are located in the axial oil return grooves 18 and can move along them. When the ball lifting screws 11 are lifted, they can drive the bearing box upper cover 7 to move upward and separate from the lower bearing box 4. When the ball lifting screws 11 are completely loosened, the bearing box upper cover 7 and the middle dividing surface of the lower bearing box 4 are completely fitted; the bearing box upper cover 7 and the middle dividing surface of the lower bearing box 4 are connected and fixed by two sets of fastening screws 15. wherein, the ball lifting screw 11 comprises a lifting screw and a ball arranged at the lower end of the lifting screw. The ball lifting screw can be a common lifting screw (in this embodiment, a standard DIN 561-1995 hexagonal head long cylindrical end set screw is used), and a steel ball that can roll freely is embedded in the lower end. This structure is similar to the ball structure of a ballpoint pen core. When the ball lifting screw 11 is used, its lifting surface has a larger force surface than the traditional lifting screw. The contact area is increased by the transition structure of the ball, the positive pressure is reduced, and the plane damage caused by surface rotation and extrusion during lifting is reduced.

[0042] In the above technical solution, the process sequence of disassembling and assembling the bearing box is changed by changing the traditional connection method between the upper oil seal and the upper cover 7 of the bearing box. Specifically, a detachable top fixing device is provided on the upper cover 7 of the bearing box, and two axial oil return grooves 18 are provided on the middle plane of the lower bearing box 4. The ball lifting screw 11 that can move in the axial oil return groove and can drive the upper cover 7 of the bearing box to move upward avoids the difficulty in processing and disassembling the slotted large cylindrical head screw 6 of the traditional installation structure, so that the operator can conveniently and quickly disassemble and assemble the upper cover 7 of the bearing box between it and the upper oil seal 5 at the top of the upper cover 7 of the bearing box, and can use the ball lifting screw 11 to lift it up, and then move it axially away from the compressor housing 1 relative to the lower bearing box 4 to remove it. After the maintenance of the inside of the bearing box is completed, it can also be conveniently reversed for installation. The bearing box and its internal components can be inspected and repaired without disassembling the auxiliary process pipeline 2 of the centrifugal compressor, thereby avoiding damage to components such as pipeline flange fasteners and gaskets caused by repeated disassembly and assembly of the auxiliary process pipeline of the compressor, and saving the cost of process gas line spare parts. Second, contamination during the disassembly of the auxiliary process pipeline 2 is avoided, and the cleaning and cleaning before replacement and reinstallation are avoided for some special medium gas pipelines. Third, the disassembly and installation cycle of the bearing box is greatly shortened, the efficiency of on-site maintenance is improved, and it is convenient and fast. Fourth, the axial relative movement of the bearing box upper cover 7 on the lower bearing box 4 can be easily completed without being completely fitted with the lower bearing box 4, thereby avoiding affecting the sealant applied on the middle dividing surface. Fifth, during relative movement, there is only rolling friction between the support point (ball) and the axial oil return groove, which will not have an adverse effect on the structure of the middle dividing surface.

[0043] Specifically, Figure 3 As shown, the structure of the detachable top fixing device includes a threaded hole set at the top of the upper oil seal 5, a positioning screw 13, a threaded through hole set at the top of the bearing box upper cover 7, and a concave screw plug 12. Among them, the center of the threaded through hole at the top of the bearing box upper cover 7 corresponds to the center of the threaded hole of the upper oil seal 5 in the upper and lower directions; the positioning screw 13 passes through the threaded through hole of the bearing box upper cover 7 and is screwed into the threaded hole of the upper oil seal 5, and the concave screw plug 12 is fixed on the threaded through hole and the upper end of the positioning screw 13 extends into the middle hole of the concave screw plug 12, so as to achieve relative fixation of the bearing box upper cover 7 and the upper oil seal 5. The positioning screw 13 and the concave screw plug 12 jointly realize the radial positioning of the upper oil seal 5, making it more stable.

[0044] Preferably, two ball lifting screws 11 are respectively installed on the two joint surfaces where the bearing box upper cover 7 and the lower bearing box 4 meet, so as to save costs to the greatest extent while ensuring the lifting function of the bearing box upper cover 7.

[0045] Preferably, the outer edge of the upper oil seal 5 is embedded in the oil seal positioning groove 16 provided on the inner wall of the bearing box upper cover 7 to achieve axial positioning of the upper oil seal 5 and make it more stable.

[0046] Preferably, the diameter of the positioning screw 13 is smaller than the thickness of the upper oil seal 5. The diameter of the positioning screw 13 is preferably 1 / 2 of the thickness of the oil seal. The thickness of the upper oil seal 5 is ≥ 6 mm.

[0047] Preferably, the positioning screw 13 is higher than the top of the threaded through hole on the bearing box upper cover 7. The design of being higher than the top is for easy disassembly). Figure 8 h1-5mm (5mm is subtracted here to leave a gap to prevent interference), the height value is preferably 15mm, such as Figure 8 As shown, the positioning screw 13 is partially threaded, one section of which is a cylindrical rod (section L2) and the other section is a threaded section (section L-L2), and the length of the threaded section is greater than 10 mm, preferably 15 mm.

[0048] Preferably, a combined gasket 19 is provided between the concave screw plug 12 and the bearing box upper cover 7. The combined gasket is a composite of rubber material and metal material, the metal part bears the supporting force, and the rubber part plays a sealing role. The combined gasket is used here to ensure the combined position of the components and seal the medium in the bearing box to prevent leakage.

[0049] Preferably, a lifting ring 8 is installed on the top of the bearing box upper cover 7, and the lifting ring 8 is located on the half of the bearing box upper cover 7 away from the compressor casing. It is used to complete the lifting work of the bearing box upper cover 7 when the lifting ring 8 is located in a vertical lifting position during the process of disassembling the bearing box upper cover 7.

[0050] The present invention provides a method for disassembling a bearing box upper cover using the above-mentioned bearing box oil baffle fastening device, comprising the following steps:

[0051] Step 1, remove the concave screw plug 12 on the top of the bearing box upper cover 7, use a wrench to clamp the upper end of the positioning screw 13 and rotate it until it is removed from the upper oil seal 5;

[0052] Step 2, remove the fastening screws 15 on the middle surface of the bearing box, and use the ball lifting screws 11 to lift the upper cover 7 of the bearing box;

[0053] Step 3, wait for the upper oil seal 5 to fall due to gravity and separate from the oil seal positioning groove 16, move the bearing box upper cover 7 away from the casing 1, and slide the ball lifting screw 11 in the axial oil return groove 18 until the position of the lifting ring 8 reaches the vertical lifting position, and use a lifting machinery to lift it to complete the disassembly operation of the bearing box upper cover 7.

[0054] A method for installing a bearing box upper cover using the above-mentioned bearing box oil retainer fastening device comprises the following steps:

[0055] Step 1, completely fit the middle surface of the upper oil sealing sheet 5 with the middle surface of the lower oil sealing sheet 14;

[0056] Step 2, pre-screw all ball lifting screws 11 to make them in a lifting state, use lifting equipment to place the bearing box upper cover 7 on the lower bearing box 4, make the balls of all lifting screws 11 located in the axial oil return groove 18, and apply sealant (i.e., sealant) on the inner end surface of the bearing box upper cover 7 (i.e., the contact end surface with the housing 1);

[0057] Step 3, using the ball lifting screw 11 as a support point, axially move the bearing box upper cover 7 along the axial oil return groove 18, in a rolling friction manner during the movement, until the middle dividing surfaces of the bearing box upper cover 7 and the lower bearing box 4 are aligned vertically;

[0058] Step 4, using the positioning screw 13 as a guide, make the upper oil seal 5 completely fit with the oil seal positioning groove 16 inside the bearing box upper cover, and apply sealant on the middle surface of the lower bearing box 4 on both sides of the axial oil return groove 18;

[0059] Step 5, loosen all ball lifting screws 11 to make the center dividing surfaces of the bearing box upper cover 7 and the lower bearing box 4 fit together;

[0060] Step 6, tighten the fastening screws 15 on the center dividing surfaces on both sides of the center axis of the bearing box;

[0061] Step 7, confirm that the positioning screw 13 is installed and tightened in place; place the combined gasket 19;

[0062] Step 8, make the upper end of the positioning screw 13 be located in the inner hole of the concave screw plug 12, install the concave screw plug 12 in the top threaded through hole of the bearing box upper cover 7 and tighten it to complete the installation operation.

[0063] The device and method of the present invention have been put into practice in a natural gas purification plant. The original lifting screw was changed into a lifting screw with a ball bearing with a ball head, and the axial oil return groove originally designed and processed was used as a guide. At the same time, the structure was modified as mentioned above. In the single single-side bearing box bearing adjustment operation, 2.5 hours of additional disassembly and assembly of auxiliary process pipelines were saved on site, 8 DN25 metal winding pads were saved, and 2 manpower were saved. It can be seen that the present invention can realize the maintenance of the bearing box and its internal components without disassembling the auxiliary process system pipeline of the centrifugal compressor, thereby avoiding the damage of components such as pipeline flange connection bolts and gaskets caused by repeated disassembly and assembly of the compressor auxiliary connection system pipeline, and saving the cost of process gas path spare parts. At the same time, pollution during pipeline disassembly is avoided, and cleaning and cleaning before replacement and reinstallation are avoided for some special medium gas pipelines. And the disassembly and installation cycle of the bearing box is greatly shortened, the efficiency of on-site maintenance is improved, and it is convenient and fast.

Claims

1. An oil retainer fastening device for a bearing box, characterized in that: It comprises a detachable top fixing device, two axial oil return grooves arranged on the middle surface of the lower bearing box and at least four ball lifting screws; wherein the detachable top fixing device fixes the upper cover of the bearing box with the upper oil seal, and at least two ball lifting screws are respectively installed on the two side end surfaces where the upper cover of the bearing box and the lower bearing box meet, and the balls of the ball lifting screws are located in the axial oil return grooves and can move along them, and when the ball lifting screws are lifted, they can drive the upper cover of the bearing box to move upward and separate from the lower bearing box, and when the ball lifting screws are loosened, the upper cover of the bearing box fits with the middle surface of the lower bearing box under the action of gravity; the upper cover of the bearing box and the middle surface of the lower bearing box are connected and fixed by two sets of fastening screws; The structure of the detachable top fixing device includes a threaded hole arranged at the top of the upper oil seal, a positioning screw, a threaded through hole arranged at the top of the bearing box upper cover, and a concave screw plug; wherein the center of the threaded through hole at the top of the bearing box upper cover corresponds to the center of the threaded hole of the upper oil seal in the upper and lower directions; the positioning screw passes through the threaded through hole at the top of the bearing box upper cover and is screwed into the threaded hole of the upper oil seal, the concave screw plug is fixed on the threaded through hole and the upper end of the positioning screw extends into the concave hole of the concave screw plug, so as to realize the relative fixation of the bearing box upper cover and the upper oil seal; The outer edge of the upper oil seal is embedded in the oil seal positioning groove provided on the inner wall of the upper cover of the bearing box to achieve axial positioning of the upper oil seal; A combined gasket is provided between the concave thread plug and the threaded through hole at the top of the bearing box upper cover; A lifting ring is installed on the top of the bearing box upper cover.

2. The oil retainer fastening device for a bearing box according to claim 1, characterized in that: Two ball lifting screws are respectively installed on the end surfaces on both sides where the upper cover of the bearing box and the lower bearing box are connected.

3. The oil retainer fastening device for a bearing box according to claim 1, characterized in that: The diameter of the positioning screw is smaller than the thickness of the upper oil sealing sheet, and the thickness of the upper oil sealing sheet is ≥6mm.

4. The oil retainer fastening device for a bearing box according to claim 1, characterized in that: The positioning screw is higher than the top of the threaded through hole on the upper cover of the bearing box, and the height value is 15mm.

5. A method for disassembling a bearing box upper cover using the bearing box oil baffle fastening device according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Remove the concave screw plug on the top of the bearing box cover, use a wrench to clamp the upper end of the positioning screw and rotate it until it is removed from the upper oil seal; Step 2, remove the fastening screws on the middle surface of the bearing box, and use the ball lifting screws to lift the upper cover of the bearing box; Step 3: After the upper oil seal falls due to gravity and separates from the oil seal positioning groove, move the upper cover of the bearing box away from the compressor casing, and move the ball lifting screw in the axial oil return groove until the lifting ring reaches the vertical lifting position to avoid interference with auxiliary process pipelines, and use a lifting machinery to lift the upper cover of the bearing box to complete the removal of the upper cover of the bearing box.

6. A method for installing a bearing box upper cover using the oil retainer fastening device for a bearing box according to any one of claims 1 to 4, characterized in that: The steps include: Step 1, completely fit the middle surface of the upper oil seal piece with the middle surface of the lower oil seal piece; Step 2: Pre-screw all ball lifting screws to make them in a lifted state, use a lifting device to place the upper cover of the bearing box on the lower bearing box, make the balls of all ball lifting screws located in the axial oil return grooves, and apply sealant on the inner end surface of the upper cover of the bearing box; Step 3, using the ball lifting screw as a support moving point, axially move the bearing box upper cover along the axial oil return groove until the middle dividing surfaces of the bearing box upper cover and the lower bearing box correspond to each other in the upper and lower directions; Step 4: Use the positioning screw as a guide to make the upper oil seal completely fit with the oil seal positioning groove inside the bearing box upper cover, and apply sealant on the middle surface of the lower bearing box on both sides of the axial oil return groove; Step 5: Loosen all ball lifting screws to make the center planes of the upper cover of the bearing box and the lower bearing box fit together; Step 6, tighten the fastening screws on the center dividing surfaces on both sides of the center axis of the bearing box; Step 7, confirm that the positioning screw is installed and tightened in place; place the combined gasket; Step 8, make the upper end of the positioning screw be located in the inner hole of the concave screw plug, install the concave screw plug in the top threaded through hole of the bearing box upper cover and tighten it to complete the installation operation.

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