A repairing device for damaged oil seal of speed reducer shaft head

Abstract

The utility model relates to the repair of the damaged oil seal of the shaft head of a speed reducer, and the repair device has a circular ring end cover with a boss, which is made of two half circular ring end covers cut from high-strength metal. The size of the half circular ring end covers is determined according to the model of the speed reducer, and the precision is controlled within ±0.1 mm. The boss is pressed against the inner side of the ring in the form of a land, and the end face of the boss is finely ground. The half circular ring end covers have bolt holes at specific positions. The bolts are made of high-strength alloy steel, and the nuts are screwed with the bolts. The nuts are welded with the bolt nuts of the bearing end cover of the speed reducer on the oiling side of the shaft head, and the oil seal is clamped by the bolts and nuts. The repair method is as follows: first, process the circular ring end cover according to the model, drill holes, and disconnect, and pretreat each component; then, butt-weld the half circular ring end cover around the shaft head, align the welded nuts, screw in the bolts, and tighten the nuts, and symmetrically tighten the backup caps to press the oil seal against the oil seal, and strictly control the size and torque during the process. The utility model also relates to the selection of the material of the oil seal, the protective treatment of the oil seal, and the regular inspection of the oil seal, so as to ensure the sealing and the stable operation of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer repair technology, and more specifically, to a repair device for damaged oil seals on the shaft end of a speed reducer. Background Technology

[0002] Speed ​​reducers are widely used in many industries. They reduce speed and increase torque through specific gear meshing methods, and are an important component of mechanical transmission systems. However, in actual operation, speed reducers often face the problem of shaft leakage due to seal damage, with oil seal aging being one of the more common causes.

[0003] When oil leakage occurs at the shaft end due to a damaged oil seal, the traditional solution is mainly to replace the skeleton oil seal or the reducer. Replacing the skeleton oil seal is extremely cumbersome, requiring the sequential removal of the motor's anchor bolts, the removal of the motor, the removal of the reducer's anchor bolts, the removal of the reducer, and the disassembly of the low-speed coupling before the old oil seal can be removed. Then, a new oil seal is installed, and the coupling, reducer, and motor are reinstalled, requiring precise alignment. This series of steps not only consumes a significant amount of time and manpower but also necessitates stopping equipment operation, severely impacting production continuity, leading to a substantial decrease in production efficiency, and increasing the labor intensity of employees. Replacing the reducer requires suitable spare parts, and the replacement process is even more complex and costly, creating a significant economic burden. Therefore, there is an urgent need for an efficient, simple, and low-cost repair method to solve the oil leakage problem caused by a damaged reducer shaft end oil seal. Summary of the Invention

[0004] In response to the aforementioned technical problems, a repair device for damaged oil seals on reducer shafts is provided. This device effectively overcomes the numerous drawbacks of replacing oil seals or reducers in existing technologies, achieving the goals of rapid repair, cost reduction, reduced labor intensity, and improved equipment operational stability and work efficiency.

[0005] The technical means adopted in this utility model are as follows:

[0006] A repair device for damaged oil seals on the shaft end of a speed reducer includes an annular end cap with a boss. The annular end cap is machined, forming two symmetrical semi-circular end caps after being cut along the centerline. The entire annular end cap is made of high-strength metal material, possessing excellent wear resistance and corrosion resistance to ensure structural stability during long-term use. Its outer diameter, inner diameter, width, thickness, and the width and thickness of the boss are determined according to the specific speed reducer model, and its dimensional accuracy is controlled within ±0.1mm to ensure precise fit with the speed reducer. The inner side of the cover is provided with a boss, the end face of which is aligned with the oil packing seal material on the low-speed end of the reducer's skeleton oil seal end face. The end face of the boss is a finely ground plane with a surface roughness of no more than Ra0.8μm. When the bolts are tightened, it can evenly apply a clamping force to the oil packing seal material, achieving a reliable seal. At the same time, the design height of the boss can ensure sufficient preload when clamping the oil packing, and can adapt to certain shaft vibrations and offsets during equipment operation while maintaining the sealing effect. The semi-circular end cover has bolt holes evenly distributed at specific positions, and the inner wall of the bolt holes is... The threads are machined to a precision of 6H, and their position corresponds to the bolt position on the bearing end cover of the low-speed end coupling of the reducer. The bolt hole diameter tolerance is ±0.05mm to ensure smooth installation and precise positioning of the bolts. The annular end cover with a boss has bolts inserted into the bolt holes. The bolts are made of high-strength alloy steel with a strength grade of not less than 8.8. Nuts are provided on the bolts and screwed onto the nuts. The nuts and bolts have a good thread fit to ensure stability during tightening. The number and position of these bolts correspond to the oil seepage side of the reducer end. The number and position of the bolts on the cover are the same. Weld the nuts to the bolts and nuts of the reducer bearing end cover on the oil leakage side of the shaft head. The welding adopts a double-sided welding process. The weld height is not less than 0.8 times the thickness of the nut to ensure the welding strength. Then, use the spare nut to tighten the ring end cover with the boss, clamp the oil pan root that is blocked at the oil leakage point of the reducer shaft head and seal the oil leakage part. During the tightening process, the tightening torque of the nut can be adjusted to keep the pressure of the boss on the oil pan root within a suitable range, to prevent the oil pan root from being damaged by excessive pressure or the seal from failing due to insufficient pressure.

[0007] A method for repairing a damaged oil seal on a reducer shaft, using the aforementioned repair device, with the following specific steps:

[0008] A circular end cap with a boss is machined, the dimensions of which are determined according to the model of the reducer. Holes are drilled as required, and then it is cut into two semi-circular end caps from the center line. During the machining process, each dimension is strictly measured and inspected to ensure that it meets the design requirements.

[0009] Weld nuts to the bolt caps on the low-speed end coupling end cover of the on-site reducer. Before welding, clean and grind the surface of the bolt caps to ensure welding quality.

[0010] Use a suitable diameter oil packing to plug the oil leak at the low-speed end of the reducer shaft. The oil packing material is selected from high temperature resistant, wear resistant and good flexibility fiber material. During the filling process, ensure that the oil packing is evenly distributed without gaps or wrinkles.

[0011] Prepare bolts and nuts, and screw the nuts onto the bolts. Adjust the screwing depth as needed to facilitate subsequent installation operations.

[0012] Two machined semi-circular end caps with protrusions are inserted and joined around the leakage side shaft of the reducer shaft. The end faces of the two semi-circular rings are aligned and then welded. The welding process is argon arc welding, and the welding current is controlled between 80-120A, so that the two semi-circular rings become a complete circular end cap with protrusions. After welding, the weld is subjected to non-destructive testing to ensure that the welding quality is defect-free.

[0013] Align the machined hole of the welded and formed annular end cap with the nut welded on the bearing end cap of the low-speed end coupling of the reducer, screw in the bolt with the spare nut, and tighten it into the bolt nut welded to the oil-leaking side of the reducer end cap. Use a torque wrench to control the tightening torque during the screwing process. The torque range is 50-80 N·m.

[0014] Tighten the bolt caps symmetrically to ensure that the welded ring is in close contact with the oil pack at the oil leak point on the low-speed end of the reducer shaft. Press and compact the oil pack to seal the leak. Observe the deformation of the oil pack during the tightening process to ensure a good sealing effect.

[0015] The diameter of the oil packing is selected based on the width of the low-speed end skeleton oil seal of the on-site reducer, with the error controlled within ±0.5mm.

[0016] The thickness of the boss must be greater than the thickness of the nut welded to the end cover of the coupling at the low speed end of the reducer, and the difference must be no less than 2mm, so as to ensure that the boss is not affected by the nut when tightening the oil packing.

[0017] A method for repairing a damaged oil seal on a gearbox shaft includes the following steps:

[0018] Based on the dimensions of the oil seepage area at the reducer shaft head, a suitable annular end cap with a boss is determined. This annular end cap has the same outer diameter, inner diameter, and width as the end cap at the oil seepage area, as well as a boss of a specific size. The end face of the boss is used to press the oil packing sealant. After the annular end cap is processed, it undergoes aging treatment to eliminate processing stress and improve structural stability.

[0019] Bolt holes 13 are machined at specific positions on the annular end cap, corresponding to the bolt positions on the end cap at the oil seepage area. The bolt holes are machined using CNC machining technology to ensure that the positional accuracy is within ±0.05mm.

[0020] The circular end cap is cut from the center line into two semi-circular end caps. The cut surfaces at the break are polished to ensure flatness after the joint is made.

[0021] Weld nuts to the bolt caps on the end cover of the coupling at the low speed end of the reducer, and then perform rust prevention treatment on the nuts after welding.

[0022] Fill the oil packing into the oil seepage area of ​​the shaft head. Before filling, clean and polish the oil seepage area of ​​the shaft head to remove oil and impurities and ensure the fit of the oil packing with the shaft head and end cap.

[0023] Two semi-circular end caps are joined around the shaft head and welded into a complete circular end cap, so that the boss end face presses on the oil pan root. During the welding process, appropriate welding sequence and welding parameters are adopted to prevent welding deformation.

[0024] The circular end cap is fixed to the oil leakage area by bolts inserted into the bolt holes and spare nuts. Tightening the spare nuts causes the boss to press against the oil packing to achieve a seal. After the equipment has been running for a period of time, the sealing effect is checked. If necessary, the tightening torque of the bolts can be adjusted appropriately.

[0025] The size of the boss on the annular end cap is designed according to the required clamping force and sealing requirements of the oil packing. This ensures that sufficient clamping force is provided when the bolts are tightened so that the oil packing fits tightly against the shaft head and the end cap, preventing oil leakage. Furthermore, the boss is designed with a slightly tapered shape, which can better adapt to the deformation of the oil packing during the clamping process and improve the sealing effect.

[0026] After the repair is completed, the repaired area is protected by applying anti-rust paint and protective grease to prevent rust and corrosion and extend the service life of the repair device.

[0027] During use, regularly check the tightness and sealing effect of the repair device. If problems such as loose bolts or aging oil packing are found, deal with them in time to ensure the long-term stable operation of the equipment.

[0028] This utility model has the following advantages:

[0029] High-efficiency repair and cost reduction

[0030] It can quickly and effectively seal oil leaks at the reducer shaft head, avoiding the complex operations of traditional oil seal or reducer replacement. This significantly shortens maintenance time, reduces equipment downtime, thereby improving production efficiency and reducing the huge economic losses caused by downtime. At the same time, it eliminates the need to purchase new reducers or a large number of spare oil seals, significantly reducing spare parts costs.

[0031] Reduce labor intensity

[0032] Compared with traditional repair methods, this utility model simplifies the maintenance process, reduces a large number of tedious disassembly and installation steps, reduces the labor intensity of employees, improves work comfort, and is beneficial to the physical and mental health of employees.

[0033] Reliable sealing performance and stable equipment operation

[0034] The annular end cap with a boss ensures a good seal by precisely pressing the boss against the oil packing and by ensuring tight fit between all components. This effectively prevents lubricating oil leakage, ensures normal lubrication of the internal transmission components of the reducer, reduces wear, extends the service life of the reducer, and improves the operational stability and reliability of the equipment.

[0035] Wide adaptability

[0036] By precisely designing the dimensions of the repair device corresponding to different models of reducers, this utility model has wide adaptability and can be applied to various models and specifications of reducers, providing a convenient solution for different users. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of this utility model before assembly.

[0039] Figure 2 This is a schematic diagram of the post-assembly finishing structure of this utility model.

[0040] Figure 3 This is a three-dimensional structural diagram of the semi-circular ring end cap of this utility model.

[0041] In the diagram: 1. Circular end cap; 11. Semi-circular end cap; 12. Boss; 13. Bolt hole; 2. Bolt; 21. Nut; 3. Oil packing. Detailed Implementation

[0042] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0046] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a repair device for damaged oil seals on the shaft end of a speed reducer, comprising:

[0050] Circular end cap with boss

[0051] The core component of this invention is a circular end cap 1 with a boss, meticulously manufactured using machining processes, possessing high precision and excellent structural strength. The circular end cap 1 is made of high-strength metal materials, such as high-quality alloy steel, which exhibits excellent wear resistance and corrosion resistance, enabling long-term stable use in harsh working environments. Its outer diameter, inner diameter, width, thickness, and the width and thickness of the boss 12 are all precisely designed according to the specific reducer model to ensure perfect compatibility. For example, for a reducer of model ZSY560-40-1, the end cap's outer diameter is set to 486mm, inner diameter to 286mm, width to 100mm, and thickness to 10mm; the boss 12 has a width of 20mm and a thickness of 13mm. Dimensional accuracy is controlled within ±0.1mm to ensure accuracy and tightness during installation.

[0052] The flange design of the boss 12 on the inner side of the end cap 1 is a key design feature. The end face of the boss 12 is finely ground, with a surface roughness of no more than Ra0.8μm, resulting in an extremely smooth and flat surface. During bolt tightening, this end face can uniformly apply pressure to the oil packing sealant, thereby achieving a reliable sealing effect. The design height of the boss 12 is precisely calculated to provide sufficient preload to the oil packing during initial installation to ensure a good seal, while also effectively accommodating potential vibrations and misalignments of the shaft head during equipment operation, maintaining a stable sealing state at all times.

[0053] Semi-circular end cap and bolt holes

[0054] The circular end cap 1, when broken along its centerline, forms two symmetrical semi-circular end caps 11. This design facilitates installation on the reducer shaft end. Bolt holes 13 are evenly distributed at specific locations on the semi-circular end caps 11. The inner walls of the bolt holes 13 are precision-threaded with a thread accuracy of 6H grade to ensure a good fit with the bolts 2. The positions of the bolt holes 13 are exactly the same as the bolt positions on the bearing end cap of the reducer's low-speed coupling, and the hole diameter tolerance is controlled within ±0.05mm, ensuring that the bolts 2 can be accurately inserted and precisely positioned.

[0055] Bolt and nut assembly

[0056] Bolt 2 is made of high-strength alloy steel with a strength grade of not less than 8.8, possessing high strength and good fatigue resistance. Bolt 2 is equipped with a nut 21, which has a precise threaded fit with bolt 2, ensuring stability during tightening and preventing loosening or stripping. During installation, first screw the nut 21 to the nut position, then insert bolt 2 into the bolt hole 13 of the annular end cap 1.

[0057] Repair methods and steps

[0058] 1. Preparation of repair equipment

[0059] First, based on the actual dimensions of the oil seepage area on the reducer shaft, a suitable annular end cap 1 with a boss was determined. During the machining of the annular end cap 1, the design dimensions were strictly followed, and each dimension was precisely measured and inspected after machining to ensure compliance. Then, bolt holes 13 were machined on the annular end cap 1, corresponding to the bolt positions on the end cap at the oil seepage area. CNC machining was used to ensure the positional accuracy of the bolt holes 13 was within ±0.05mm. After machining, the annular end cap 1 was cut from the centerline into two semi-circular end caps 11. The cut surfaces at the break point required fine grinding to ensure the flatness of the two semi-circular rings after joining, facilitating subsequent welding operations.

[0060] 2. On-site component handling

[0061] The bolt caps on the low-speed end coupling cover of the reducer were cleaned and polished to remove oil, rust, and other impurities. Nuts 21 were then welded to the bolt caps. Double-sided welding was used, with the weld height no less than 0.8 times the nut thickness to ensure weld strength. After welding, nut 21 was treated with rust prevention to prevent rust from affecting subsequent use. Simultaneously, the oil seepage area on the shaft head was thoroughly cleaned and polished to remove oil, impurities, and uneven surfaces, creating favorable conditions for the filling of the oil packing 3.

[0062] 3. Oil packing filling and end cap installation

[0063] Select an oil packing 3 of appropriate diameter based on the width of the low-speed end oil seal of the reducer, with an error controlled within ±0.5mm. The material should be a high-temperature resistant, wear-resistant, and highly flexible fiber material. Evenly fill the oil leakage area of ​​the shaft head with the oil packing 3, ensuring no gaps or wrinkles to allow it to fully perform its sealing function. Then, insert and align two machined semi-circular end caps 11 with bosses around the leakage side of the reducer shaft head, using argon arc welding with a welding current controlled between 80-120A. After welding, perform non-destructive testing on the weld, such as ultrasonic testing or radiographic testing, to ensure the weld quality is defect-free.

[0064] 4. End cap fixing and sealing adjustment

[0065] Align the machined hole 13 of the welded annular end cap 1 with the nut 21 welded to the bearing end cap of the low-speed end coupling of the reducer. Screw in the bolt 2 with a spare nut, using a torque wrench to control the tightening torque, within the range of 50-80 N·m. Tighten the bolt 2 into the bolt nut welded to the oil-leaking side of the reducer end cap. Finally, symmetrically tighten the spare nuts of the bolt 2 to ensure that the welded annular ring is in close contact with the oil packing 3 pressed into the oil-leaking area of ​​the low-speed end shaft of the reducer, pressing it firmly. During the tightening process, closely observe the deformation of the oil packing 3 to ensure a good sealing effect. Simultaneously, after the repair is completed, protect the repaired area by applying anti-rust paint and protective grease to prevent rust and corrosion, extending the service life of the repair device. During equipment operation, regularly check the tightness and sealing effect of the repair device. If problems such as loose bolt 2 or aging oil packing 3 are found, address them promptly to ensure long-term stable operation of the equipment.

[0066] Example 1 Figure 1 and Figure 2 As shown

[0067] Implementation steps using ZSY560-40-1 reducer as an example

[0068] For a reducer of model ZSY560-40-1 with an input speed of 1500 rpm, power of 280 KW, and weight of 5100 Kg, and a low-speed end shaft diameter of 280 mm, with 6 bolts evenly arranged, the circular end cover 1 with bosses is first machined according to the above design dimensions. High-precision CNC machining equipment is used to ensure the accuracy of the end cover's outer diameter (486 mm), inner diameter (286 mm), width (100 mm), thickness (10 mm), and boss 12's width (20 mm) and thickness (13 mm). On the 100 mm wide surface of the circular end cover 1, six ∮14 mm bolt holes 13 are evenly machined using a CNC drilling machine, ensuring that the positions of the bolt holes 13 precisely correspond to the bolt positions on the bearing end cover of the low-speed end coupling of the reducer, with the hole diameter tolerance controlled within ±0.05 mm. After processing, the circular end cap 1 is cut into two symmetrical semi-circular end caps 11 from the center line using wire cutting technology, and the cut surfaces at the break are finely polished to make the flatness of the mating surfaces within 0.1mm.

[0069] Clean and grind the six bolt caps on the low-speed end coupling end cover of the reducer to remove surface oil, rust, and other impurities. Then, use welding equipment to double-sided weld nuts 21, which have a diameter of ∮12mm. During welding, control the welding current between 100-120A to ensure that the weld height is not less than 0.8 times the nut thickness. After welding, perform rust prevention treatment on nuts 21, such as spraying rust-preventive paint or applying rust-preventive grease.

[0070] Based on the width of the low-speed end skeleton oil seal of the reducer on site, a 13mm diameter oil packing root 3 was selected. The material is a high-temperature resistant, wear-resistant, and flexible fiber material. The oil packing root 3 was carefully filled into the oil leakage area of ​​the shaft head. During the filling process, a special tool was used to compact it to ensure that the oil packing root 3 was evenly distributed without gaps or wrinkles. The filling depth was determined according to the actual situation, but it was necessary to ensure that the oil packing root 3 could fully contact the end face of the boss 12.

[0071] Prepare six ∮12mm high-strength alloy steel bolts 2, with a strength grade of 8.8, and matching nuts 21. Screw the nuts 21 onto the bolts 2, to a depth of approximately 1 / 3 of the bolt length, to facilitate subsequent installation operations.

[0072] Two machined semi-circular end caps 11 with protrusions are inserted and joined around the leakage side of the reducer shaft. A special clamp is used to secure the two semi-circular end caps 11, ensuring the end faces are aligned. Then, argon arc welding is performed. During welding, the welding current is controlled between 80-100A, and the welding speed is moderate to ensure a uniform, full weld free of defects such as porosity and cracks. After welding, an ultrasonic flaw detector is used to perform non-destructive testing on the weld to ensure the welding quality meets requirements.

[0073] Align the six machined holes 13 of the welded annular end cap 1 with the nuts 21 welded to the bearing end cap of the low-speed coupling of the reducer, and screw in the ∮12mm bolts 2 with spare caps. Use a torque wrench to tighten the bolts 2 into the welded nuts with a torque range of 50-80 N·m. During the tightening process, pay attention to maintaining even force on the bolts 2 to avoid individual bolts being overtightened or loosened.

[0074] Finally, tighten the bolts 2 symmetrically with their nuts to ensure the welded ring is in tight contact with the oil packing 3 pressed into the oil leak area of ​​the low-speed end shaft of the reducer, compressing it firmly. During tightening, observe the deformation of the oil packing 3 to ensure a good seal. Use a feeler gauge to check the gap between the ring end cap 1 and the reducer end cap; it should be uniform and the gap value should not exceed 0.2mm. After tightening, protect the repaired area by first applying a layer of anti-rust paint, and after the anti-rust paint dries, apply protective grease to prevent rust and corrosion.

[0075] Implementation and adjustment of different models of reducers

[0076] For different models of speed reducers, the repair device needs to be adjusted according to their specific dimensions when implementing the repair method of this utility model. The main adjustments include the outer diameter and inner diameter of the annular end cap 1, the size of the boss 12, the size and number of bolt holes 13, and the diameter of the oil packing 3. When determining these dimensions, parameters such as the shaft diameter, end cap size, and bolt distribution of the speed reducer should be considered to ensure a perfect fit between the repair device and the speed reducer. For example, for speed reducers with larger shaft diameters, the inner diameter of the annular end cap 1 should be increased accordingly; for speed reducers with different bolt distributions, the position and number of bolt holes 13 should be adjusted. Simultaneously, during the manufacturing of the repair device and the implementation of the repair process, the adjusted dimensions should be strictly followed to ensure the accuracy and effectiveness of each step, thereby achieving good repair results and ensuring stable equipment operation. In practical applications, continuous accumulation of repair experience with different models of speed reducers will further optimize the repair process and device design, improving the versatility and practicality of this utility model.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A repair device for damaged oil seals on the shaft end of a speed reducer, characterized in that, The device includes a circular end cap (1) with a boss, which is machined by cutting. After being cut from the center line, it forms two symmetrical semi-circular end caps (11). The circular end cap (1) is made of high-strength metal material. Its outer diameter, inner diameter, width, thickness, and the width and thickness of the boss (12) are determined according to the specific reducer model. The end cap (1) has a boss (12) on the inner side. The end face of the boss (12) is aligned with the oil packing (3) sealing material of the oil seal end face of the low-speed end skeleton of the reducer. The end face of the boss (12) is a finely ground plane, which can evenly apply the clamping force to the oil packing sealing material when the bolt is tightened. At the same time, the design height of the boss (12) can ensure that sufficient preload is provided when clamping the oil packing (3). The semi-circular end cap (11) is evenly machined with bolt holes (13). The inner wall of the bolt holes (13) is threaded. Its position is connected to the low-speed end coupling of the reducer. The bolts on the bearing end cover are in the same position; the annular end cover (1) with the boss has a bolt (2) inserted into the bolt hole (13). The bolt (2) is made of high-strength alloy steel. The bolt (2) is equipped with a nut (21) and screwed to the nut. The nut (21) and the bolt (2) are threaded together. The number and position of the bolt (2) are the same as the number and position of the bolts on the oil seepage side of the reducer end cover. The nut (21) is welded to the bolt nut on the oil seepage side of the reducer bearing end cover. The welding adopts a double-sided welding process. The weld height is not less than 0.8 times the thickness of the nut to ensure the welding strength. Then, the annular end cover (1) with the boss is tightened with the spare nut (21) of the bolt (2). The oil pack root (3) blocking the oil seepage at the reducer shaft head is clamped to seal the oil seepage part. During the tightening process, the tightening torque of the nut (21) can be adjusted to make the boss (12) press against the oil pack root.

2. The repair device for damaged oil seal of reducer shaft as described in claim 1, characterized in that: The oil packing (3) is made of high temperature resistant, wear resistant and good flexibility fiber material, and is divided into fine fiber oil packing and coarse fiber oil packing. During the filling process, fine fiber is filled first, and then coarse fiber is stacked on the outside of fine fiber to ensure no gaps and wrinkles.

3. The repair device for damaged oil seal of a reducer shaft according to claim 2, characterized in that, The thickness of the boss (12) should be greater than the thickness of the nut (21) welded to the end cover of the coupling at the low speed end of the reducer, and the difference should not be less than 2mm, so as to ensure that the boss (12) is not affected by the nut (21) when the oil packing root (3) is tightened.

4. The repair device for damaged oil seal of reducer shaft as described in claim 3, characterized in that, The size of the boss (12) of the circular end cap (1) is designed according to the required clamping force and sealing requirements of the oil packing (3), and the shape of the boss (12) is designed to be tapered, so that it can better adapt to the deformation of the oil packing (3) during the clamping process.

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