Lower cover structure, connecting shaft lubricating cover and finishing mill

Abstract

The lower cover structure comprises a bottom plate, two opposite side plates, an inner baffle and an outer baffle, the bottom plate is provided with an outer end, an inner end and a sunken part, the outer end and the inner end are in the first direction, the sunken part extends between the outer end and the inner end, a first oil return opening is formed in the bottom end of the sunken part, the two opposite side plates are arranged, and the second direction is perpendicular to the first direction; the two side plates are connected to the two opposite sides, in the second direction, of the bottom plate respectively, the inner baffle is connected between the inner end and the two side plates and used for being connected with a gear machine base of a finishing mill transmission system, the outer baffle is connected between the outer end and the two side plates, and the outer baffle is provided with a hole part used for a connecting shaft to penetrate through. The oil pool is formed at the bottom of the lower cover of the connecting shaft lubricating cover, the inclined surface of the concave part is more beneficial to quick oil return, the storage space of the whole oil pool is larger, and even if thin oil with slow oil return stroke forms the oil pool at the bottom of the lower cover, the thin oil cannot leak from the joint surface of the lower cover structure and the gear base.

Description

Technical Field

[0001] The present invention relates to the technical field of finishing mills, in particular to a lower cover structure, a shaft connecting lubrication cover and a finishing mill. Background Art

[0002] The main drive system of the finishing mill consists of a motor, a speed reducer, a gear frame, and a drum gear coupling. After lubricating the drum gear coupling, the thin oil flows out from the tooth ends of the drum gear coupling, into the coupling lubrication cover, and then connects to the oil return line through the oil port at the bottom of the coupling lubrication cover. Finally, it returns to the oil tank, completing the cycle.

[0003] Figure 1 The coupling lubrication cover is shown as consisting of an upper left cover 2, an upper right cover 3, and a lower cover 1. Only two circular holes are left where the drum gear coupling outputs, through which the coupling extends. Currently, when replacing a fine-rolled curved gear coupling, all three lubrication covers must be removed first, as the coupling interferes with the lubrication covers when withdrawn. Due to frequent lubrication cover removal and the location of the bottom row of bolts on the lower cover 1 below the outer side, securing them in a narrow space is difficult, and the seal between the lower cover and the gear base often fails.

[0004] During operation, after the lubricating oil flows back into the lower cover 1, a large area of ​​oil leakage often occurs at the junction of the lower cover 1 and the gear base. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a lower cover structure, a shaft connecting lubrication cover and a finishing mill.

[0006] The present application provides a lower cover structure, including a bottom plate, a side plate, an inner baffle and an outer baffle. The bottom plate is provided with an outer end and an inner end along a first direction and a recessed portion extending between the outer end and the inner end. A first oil return port is provided at the bottom end of the recessed portion. The side plate is provided with two opposite sides, and the second direction is perpendicular to the first direction. The two side plates are respectively connected to the opposite sides of the bottom plate in the second direction. The inner baffle is connected between the inner end and the two side plates. The inner baffle is used to be connected to the gear base of the finishing mill transmission system. The outer baffle is connected between the outer end and the two side plates. The outer baffle is provided with a hole for the connecting shaft of the finishing mill transmission system to pass through.

[0007] In some embodiments, the outer baffle is installed with a first oil baffle, which is a semi-ring structure. The first oil baffle is distributed along the edge of the hole portion. The outer diameter of the first oil baffle is larger than the aperture of the hole portion. The inner diameter of the first oil baffle is smaller than the aperture of the hole portion and smaller than the outer diameter of the connecting shaft passing through the connecting shaft lubrication cover. The first oil baffle is limited to adaptive elastic deformation when colliding with the connecting shaft.

[0008] In some embodiments, the base plate also includes a flat plate portion extending between the outer end and the recessed portion, and the flat plate portion is distributed along the first direction and the second direction; the flat plate portion is connected to at least two second oil baffles, and at least two second oil baffles are distributed at intervals along the first direction, and the second oil baffles are connected to the two side plates. The second oil baffle is formed with a channel for the connecting shaft to pass through on the side away from the flat plate portion, and the second oil baffle is provided with a second oil return port on the side adjacent to the flat plate portion. At least two second oil baffles are used to form an annular labyrinth seal with the oil baffle ring of the upper cover structure of the connecting shaft lubrication cover.

[0009] In some embodiments, the first direction and the second direction are both horizontal directions, and in the longitudinal direction of the recessed portion, the outer end is farther away from the bottom end of the recessed portion than the inner end, and the projection of the recessed portion in the second direction is a trapezoidal structure, and the first oil return port located between the outer end and the inner end is relatively close to the outer end.

[0010] In some embodiments, the lower cover structure further includes a filter plate, which is connected between the two side plates, the filter plate is connected to the recessed portion, and the filter plate is laid between the bottom end and the top end of the recessed portion.

[0011] In some embodiments, the lower cover structure further includes an inner combining panel and an upper combining panel, two inner combining panels are relatively provided, the two inner combining panels are respectively connected to the ends of the two side plates in the first direction, and the inner combining panels are used to be connected to the gear base of the finishing mill transmission system, and two upper combining panels are relatively provided, the two upper combining panels are respectively connected to the ends of the two side plates away from the bottom end, and the upper combining panels are used to be connected to the upper cover structure of the connecting shaft lubrication cover.

[0012] In some embodiments, the inner joining panel is connected to the inner baffle, and both the inner joining panel and the inner baffle are provided with a sealing groove on a side away from the outer baffle, and a sealing ring is installed in the sealing groove.

[0013] In some embodiments, the inner side of the upper combining panel is connected to the side panel and the outer baffle, and the upper combining panel is provided with a third oil return port, the third oil return port is connected to an oil drain pipeline, and the oil drain pipeline is connected to between the two side panels; the lower cover structure also includes a combining surface baffle, two combining surface baffles are arranged opposite to each other, and the combining surface baffles are respectively connected to the two upper combining panels, and the combining surface baffles are distributed along the outer side of the upper combining panel, and the combining surface baffles protrude upward compared to the upper combining panel.

[0014] A shaft connecting lubrication cover comprises the above-mentioned lower cover structure and an upper left cover and an upper right cover as an upper cover structure. The upper left cover and the upper right cover are respectively fixedly connected to two side plates.

[0015] A finishing mill, wherein the drum-shaped gear coupling shaft of the transmission system of the finishing mill is assembled in the above-mentioned coupling shaft lubrication cover, and the drum-shaped gear coupling shaft of the transmission system of the finishing mill is passed through the hole portion.

[0016] The beneficial effects of the present application are as follows: a lower cover structure is provided, including a bottom plate, a side plate, an inner baffle and an outer baffle, which is connected to the gear base of the finishing mill transmission system through the inner baffle, and the connecting shaft passes through the hole of the outer baffle, and the bottom plate is provided with an outer end and an inner end along a first direction and a recessed portion extending between the outer end and the inner end, and a first oil return port is provided at the bottom end of the recessed portion, and the bottom end of the recessed portion is the lowest position of the recessed portion; by forming an oil pool at the bottom of the lower cover of the connecting shaft lubrication cover, the inclined surface of the recessed portion is more conducive to rapid oil return, and the entire oil pool has a larger storage space. Even if the thin oil with a slow oil return process forms an oil pool at the bottom of the lower cover, the thin oil will not be higher than the inner baffle, thereby improving the situation where the thin oil leaks from the joint surface between the lower cover structure and the gear base. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention.

[0018] Figure 1 It is a structural schematic diagram of the shaft lubrication cover in the background technology;

[0019] Figure 2 An overall schematic diagram of a lower cover structure provided in this application;

[0020] Figure 3 A front view of a lower cover structure provided in this application;

[0021] Figure 4 A side view of a lower cover structure provided in this application;

[0022] Figure 5 A top view of a lower cover structure provided in this application;

[0023] Figure 6 This is a schematic diagram of the installation of the first oil baffle of the lower cover structure provided in this application.

[0024] The accompanying drawings are marked: 1-outer baffle, 2-side plate, 3-oil storage diagram, 4-first oil return port, 5-filter plate, 6-bottom plate, 6a-outer end, 6b-inner end, 6c-recessed portion, 6d-flat portion, 7-inner baffle, 8-jointing surface baffle, 9-second oil baffle, 9a-second oil return port, 10-first oil baffle, 11-inner joint panel, 12-upper joint panel, 12a-third oil return port, 13-sealing groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] In addition, this application may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0027] In a continuous hot strip mill production line, the finishing mill's main drive system consists of a motor, reducer, gear frame, and drum gear coupling. The drum gear coupling is lubricated with thin oil. After lubricating the drum gear coupling internally, the oil flows out from the tooth tips of the drum gear coupling, into the coupling lubrication cover, and then connects to the return oil line through the oil port at the bottom of the cover. Finally, it returns to the oil tank, completing the cycle. The thin oil circulation route in the coupling thin oil lubrication station is generally: pump station - intermediate pipeline - coupling lubrication oil inlet point - coupling internal lubrication - coupling lubrication cover - oil return line - oil return filter - and then back to the oil tank.

[0028] Please refer to Figure 1 The coupling lubrication cover in the prior art consists of three parts: an upper left cover 2, an upper right cover 3 and a lower cover 1. The upper left cover 2 and the upper right cover 3 have inspection holes, sight hole covers, etc. The lower cover 1 is provided with an oil return port connected to the return oil pipeline of the coupling thin oil lubrication system. The three covers are fixed to the end face of the gear base by bolts. At the same time, the three covers are connected to each other by bolts to form a semi-enclosed box, leaving only two circular holes at the output position of the drum gear coupling for outputting the coupling.

[0029] The inventor discovered the following during actual work and analysis and reflection on the work.

[0030] Currently, when replacing a fine-rolled curved gear coupling, three lubrication covers must be removed first because they interfere with the lubrication covers when the coupling is withdrawn. Frequent lubrication cover removal, coupled with the tight location of the bottom row of bolts on lower cover 1 below the outer side of the lower cover, prevents proper tightening. Consequently, the seal between the lower cover and the gear frame often fails. This frequent removal of the lubrication covers results in prolonged coupling replacement.

[0031] After the thin oil returns to the lower cover 1, due to its high viscosity and the fact that the oil return point is flush with the bottom of the entire lower cover 1, the oil return rate is slow, often forming an oil pool about 10mm high at the bottom of the lower cover 1. Because the coupling tooth end has multiple bolts, broken or fallen bolts can fall to the bottom of the lower cover 1. The presence of the oil pool not only prevents the timely detection of broken or fallen bolts and the detection of coupling problems, but also causes the thin oil to leak along the interface between the lower cover 1 and the gear base, causing environmental pollution and increasing abnormal thin oil consumption.

[0032] The upper left cover 2 and the upper right cover 3 of the coupling lubrication cover are provided with multiple inspection holes and sight hole covers. Due to daily inspection of the coupling tooth end connection equipment, the inspection holes and sight hole covers need to be opened. Frequent disassembly also leads to frequent oil leakage problems, causing pollution to the environment, and increasing abnormal consumption of thin oil.

[0033] When faced with the problem of large-scale leakage of lubricating oil, the existing technical solution can only frequently replace the seal. Due to the high technical level and difficulty of flat sealing, it is impossible to achieve zero leakage, resulting in large consumption of thin oil and high cost pressure.

[0034] Based on this, the inventor provides a lower cover structure, please refer to Figures 1 to 5 The lower cover structure includes a bottom plate 6, side plates 2, inner baffles 7, and outer baffles 1. The bottom plate 6 has an outer end 6a and an inner end 6b along a first direction, and a recessed portion 6c extending between the outer and inner ends 6a and 6b. The bottom end of the recessed portion 6c is relatively lower than the outer and inner ends 6a and 6b of the bottom plate 6. A first oil return port 4 is formed at the bottom end of the recessed portion 6c.

[0035] There are two side panels 2, the second direction is perpendicular to the first direction, and the two side panels 2 are respectively connected to the opposite sides of the bottom panel 6 in the second direction. The bottom shape of the side panels 2 is adapted to the shape of the bottom panel 6. The first direction is the left-right direction. Figure 5 In the figure shown, the first direction is the left-right direction, and the second direction is the up-down direction. Taking a spatial coordinate system as an example, the first direction, the second direction and the height direction correspond to the x-axis, the y-axis and the z-axis respectively.

[0036] The inner baffle 7 is connected between the inner end 6b and the two side plates 2. It is used to connect to the gear base of the finishing mill's transmission system. The outer baffle 1 is connected between the outer end 6a and the two side plates 2. It has a hole for the connecting shaft. The terms "inside" and "outside" in the inner and outer baffles 7 and 1 refer to the side closer to the gear base as "inside" and the side farther from the gear base as "outside." The inner baffle 7 connects to the gear base of the finishing mill's transmission system, and the connecting shaft passes through the hole in the outer baffle 1.

[0037] A first oil return port 4 is defined at the bottom of recessed portion 6c, which is its lowest point. By forming an oil pool at the bottom of the lower cover of the shaft coupling lubrication hood, the inclined surface of recessed portion 6c facilitates rapid oil return, providing ample storage space. Even if slow-returning thin oil forms a pool at the bottom of the lower cover, it will not rise above inner baffle 7, thereby minimizing oil leakage from the interface between the lower cover structure and the gear base.

[0038] In some embodiments, the outer baffle 1 is equipped with a first oil baffle 10. The first oil baffle 10 is a semi-ring structure. The first oil baffle 10 is distributed along the edge of the hole. The outer diameter of the first oil baffle 10 is larger than the aperture of the hole. The inner diameter of the first oil baffle 10 is smaller than the aperture of the hole and smaller than the outer diameter of the coupling shaft passing through the coupling shaft lubrication cover. The first oil baffle 10 is limited to adaptive elastic deformation when colliding with the coupling shaft. When replacing the drum-shaped tooth coupling shaft, whether removing the coupling shaft or installing the coupling shaft, the coupling shaft does not interfere with the metal part of the lower cover structure during the process. The coupling shaft only contacts the first oil baffle 10 when the swing angle is particularly large. The first oil baffle 10 has a flexible function. While supporting the free swing of the coupling shaft, it will block the oil and gas in the lubrication cover, reducing the oil and gas overflowing from the lubrication cover. At the same time, the drum-shaped tooth coupling shaft can be replaced without removing the lubrication cover, realizing rapid replacement of the coupling shaft, thereby improving the efficiency of coupling shaft replacement.

[0039] When replacing the drum gear coupling, there is no need to remove the lubrication cover, thereby improving the problem of seal failure and oil leakage caused by removing the lower cover when replacing the coupling.

[0040] In some embodiments, the first oil baffle 10 is made of rubber, which is a general term for vulcanized rubber and has the characteristics of not being sticky and not easy to break. The first oil baffle 10 can also be made of other flexible materials. Figure 6 , Figure 6 Shows the installation form of the first oil baffle 10 and the outer baffle 1, combined with reference Figure 2 and Figure 6 By adding a pressure ring, the pressure ring provides an installation base for the bolts. The first oil baffle 10 is located between the pressure ring and the outer baffle 1, and the three are connected and fastened by multiple bolts.

[0041] In some embodiments, please refer to Figures 2 to 5The bottom plate 6 also includes a flat portion 6d extending between the outer end 6a and the recessed portion 6c. The flat portion 6d is arranged along the first direction and the second direction. The flat portion 6d is connected to at least two second oil baffles 9, which are spaced apart along the first direction. The second oil baffles 9 are connected to the two side plates 2. The second oil baffles 9 have a hole formed on the side away from the flat portion 6d for the connecting shaft to pass through. The second oil baffles 9 have a second oil return port 9a formed on the side adjacent to the flat portion 6d. The at least two second oil baffles 9 are used to form an annular labyrinth seal with the oil baffle ring of the upper cover structure of the connecting shaft lubrication cover.

[0042] A labyrinth seal prevents leakage by creating a throttling effect when the sealed medium passes through the gaps within the labyrinth. This application further reduces oil leakage by adding a labyrinth seal before the outer baffle 1 to block the oil spun by the coupling shaft. The drum-shaped gear coupling spun the oil into the oil grooves around the second oil baffle 9. The oil then flows through the second oil return port 9a of the second oil baffle 9 and returns to the oil pool in the recessed portion 6c of the base plate 6.

[0043] In some embodiments, see Figure 3 The first and second directions are both horizontal. In the depth direction of the recessed portion 6c, the outer end 6a is farther from the bottom end of the recessed portion 6c than the inner end 6b. The projection of the recessed portion 6c in the second direction is a trapezoidal structure. The first oil return port 4 is located between the outer end 6a and the inner end 6b. The first oil return port 4 is relatively close to the outer end 6a and relatively far from the inner end 6b. The first oil return port 4 is located at the lowest point of the recessed portion 6c of the bottom plate 6. A flange mounting surface is provided at the first oil return port 4 for connection to the oil return pipeline. In order to facilitate the collection of thin oil, such as Figure 3 As shown, the recessed portion 6c is an inverted trapezoidal structure. The two oblique waist surfaces of the trapezoidal structure are more conducive to the rapid return of the thin oil after the lubrication of the connecting shaft. The entire oil pool has a large storage space. Even if the thin oil returns slowly and forms an oil pool at the bottom, the thin oil will not exceed the inner baffle 7 and leak from the joint surface with the gear base.

[0044] In some embodiments, see Figure 3 The lower cover structure also includes a filter plate 5, which is connected between the two side plates 2 and the recessed portion 6c. The filter plate 5 is positioned between the bottom and top ends of the recessed portion 6c. The filter plate 5 filters larger impurities from the returning thin oil and traps foreign matter such as broken bolts and broken teeth on the filter plate 54, facilitating timely elimination of potential equipment hazards during inspection of the drum gear coupling's tooth end.

[0045] Thin oil can pass through the filter plate 5 normally, while foreign matter such as broken bolts and broken teeth cannot pass through the filter plate 5. The filter holes of the filter plate 5 are designed according to actual needs. For example, a 200-mesh filter plate 5 can be used, which can filter larger foreign matter particles without affecting the oil return speed.

[0046] In some embodiments, please refer to Figures 2 to 5 The lower cover structure also includes an inner joint panel and an upper joint panel 12.

[0047] Two inner combining panels are arranged opposite to each other, and the two inner combining panels are respectively connected to the ends of the two side panels 2 in the first direction. The lower cover structure is connected to the gear base of the finishing mill transmission system through the inner combining panels. The inner combining panels are provided with screw holes, and a detachable connection with the gear base is achieved by bolts.

[0048] Two upper combining panels 12 are provided opposite to each other, and the two upper combining panels 12 are respectively connected to the ends of the two side panels 2 away from the bottom end. The lower cover structure is connected to the upper cover structure of the connecting shaft lubrication cover through the upper combining panel 12. The upper combining panel 12 is provided with screw holes, and a detachable connection with the upper cover structure is achieved by bolts.

[0049] In some embodiments, the inner joint panel is connected to the inner baffle 7, and the inner joint panel and the inner baffle 7 are both connected to the gear base. The inner baffle 7 and the two inner joint panels located on both sides of the inner baffle 7 form a U-shaped structure as a whole. Please refer to Figure 4 Both the inner joining panel and inner baffle 7 have sealing grooves 13 on the side facing away from the outer baffle 1. These grooves are fitted with sealing rings, which provide a sealed connection between the lower housing and the gear base. Even if the oil return rate is slow, causing the accumulated level of the thin oil in the sump to rise above the inner baffle 77, the seals in the sealing grooves 13 and the sealing rings provide a secondary safeguard against oil leakage.

[0050] The inner baffle 7 is designed with bolt holes. During installation, the bolts on the inner baffle 7 need to be installed on the inner side of the lower cover structure. Since the outer baffle 1 has been installed with a flexible first oil baffle 10, there is no need to disassemble the lower cover structure when replacing the drum gear shaft, and there is no need to remove the bolts again during the entire life cycle of the gear base.

[0051] In some embodiments, the upper edge of the inner baffle 7 is at the same height as the flat plate portion 6d of the bottom plate 6, ensuring that a larger oil pool space can be formed. Figure 3 The corresponding oil storage diagram 3 is shown. As long as the liquid level of the thin oil in the oil pool is lower than the bottom end of the outer baffle 1, there will be no oil leakage problem.

[0052] In some embodiments, please refer to Figure 2 and Figure 5The inner side of the upper joint panel 12 connects to both the side panels 2 and the outer baffle 1. Each upper joint panel 12 is provided with a third oil return port 12a, which is connected to an oil drain line that extends between the two side panels 2. The lower cover structure also includes two joint surface baffles, which are arranged opposite each other and connected to the two upper joint panels 12. The joint surface baffles are distributed along the outer side of the upper joint panel 12 and protrude upward relative to the upper joint panel 12.

[0053] The above-mentioned joint surface baffle is welded along the outer shape of the upper joint panel, and the joint surface baffle is sealed at the upper edge of the outer baffle 1 to form a Figure 5 The two L-shaped oil pools shown in the figure have drain holes and drain pipes at the bottom of the oil pool, and the drain pipes are connected to the side plate 2. Even if the inspection holes and sight hole covers of the upper cover structure cause the thin oil to leak, the oil will not leak from the upper side of the outer baffle 1, but will gather and form Figure 5 The L-shaped oil pool shown in the figure flows back to the inner side of the side plate 2 along the oil drain hole and oil drain pipe, and then to the oil pool on the recessed portion 6c of the bottom plate 6 for unified oil return treatment and recirculation back to the oil tank, thereby having the beneficial effect of reducing the consumption of the thin oil product of the coupling. The above method realizes the complete leakage of the coupling lubricating oil.

[0054] The lower cover structure provided above can be connected by welding in multiple places, such as between the side plate 2 and the bottom plate 6 , between the side plate 2 and the second oil baffle 9 , and between the side plate 2 and the inner baffle 7 .

[0055] In summary, the lower cover structure provided by the present application can reduce the number of replacement steps for the drum gear coupling and improve the replacement efficiency of the drum gear coupling; by increasing the bottom inclined surface, the depth of the bottom oil pool and the small oil pool at the joint surface, the coupling thin oil can be returned without leakage, reducing the oil consumption of the coupling thin oil system; by setting the filter plate 5, larger foreign objects mixed in the thin oil that fall due to equipment hazards can be filtered out, making it easier to eliminate equipment hazards in a timely manner.

[0056] The present application also provides a connecting shaft lubrication cover, including the above-mentioned lower cover structure, and the upper left cover and upper right cover as the upper cover structure. The upper left cover and upper right cover are respectively fixedly connected to the two side plates 2. The lower cover structure and the upper left cover and upper right cover together constitute a complete lubrication cover, which collects the lubricating oil after lubrication of the connecting shaft and returns it to the oil tank, so that the lubricating oil working system can operate smoothly.

[0057] The present application also provides a finishing mill, the main transmission system of which comprises a motor, a reducer, a gear frame, and a drum gear coupling. The drum gear coupling is assembled in the aforementioned coupling lubrication cover. The drum gear coupling extends from the gear frame, passes through the aforementioned coupling lubrication cover, and exits through the hole in the outer baffle 1. After the thin oil lubricates the interior of the drum gear coupling, it flows out from the tooth ends of the drum gear coupling, into the coupling lubrication cover, and finally returns to the oil tank through the first oil return port 4 at the bottom of the coupling lubrication cover, completing the cycle.

[0058] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0059] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0060] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A lower cover structure, characterized in that: include: The bottom plate is provided with an outer end and an inner end along a first direction, and a recessed portion extending between the outer end and the inner end, wherein a first oil return port is formed at a bottom end of the recessed portion; Two side panels are provided, and the two side panels are respectively connected to opposite sides of the bottom plate in a second direction perpendicular to the first direction; an inner baffle, connected between the inner end and the two side plates, and used for connecting to the gear stand of the finishing mill transmission system; and The outer baffle is connected between the outer end and the two side plates and is provided with a hole for the connecting shaft of the finishing mill transmission system to pass through.

2. The lower cover structure according to claim 1, characterized in that: The outer baffle is equipped with: The first oil baffle is a semi-ring structure distributed along the edge of the hole portion, with an outer diameter larger than the aperture of the hole portion, an inner diameter smaller than the aperture of the hole portion and smaller than the outer diameter of the connecting shaft passing through the connecting shaft lubrication cover, and is limited to adaptive elastic deformation when colliding with the connecting shaft.

3. The lower cover structure according to claim 2, characterized in that: The bottom plate further includes a flat plate portion extending between the outer end and the recessed portion, wherein the flat plate portion is distributed along the first direction and the second direction; The flat plate portion is connected to at least two second oil baffles, and the at least two second oil baffles are spaced apart along the first direction. The second oil baffles are connected to the two side plates. The second oil baffle is formed with a channel for the connecting shaft to pass through on the side away from the flat plate portion. The second oil baffle is provided with a second oil return port on the side adjacent to the flat plate portion. At least two of the second oil baffles are used to form an annular labyrinth seal with the oil baffle ring of the upper cover structure of the connecting shaft lubrication cover.

4. The lower cover structure according to claim 3, characterized in that: Both the first direction and the second direction are horizontal directions. In the longitudinal direction of the recessed portion, the outer end is farther away from the bottom end of the recessed portion than the inner end. The projection of the recessed portion in the second direction is a trapezoidal structure. The first oil return port located between the outer end and the inner end is relatively close to the outer end.

5. The lower cover structure according to claim 1, wherein: The lower cover structure further includes: The filter plate is connected between the two side plates, connected to the recessed portion, and laid between the bottom end and the top end of the recessed portion.

6. The lower cover structure according to any one of claims 1 to 5, characterized in that: The lower cover structure further includes: Two inner joint panels are provided opposite to each other and are respectively connected to the ends of the two side plates in the first direction, and the inner joint panels are used to connect to the gear base of the finishing mill transmission system; Two upper combining panels are provided opposite to each other and are respectively connected to the ends of the two side panels away from the bottom ends. The upper combining panels are used to be connected to the upper cover structure of the connecting shaft lubrication cover.

7. The lower cover structure according to claim 6, characterized in that: The inner combining panel is connected to the inner baffle. The inner combining panel and the inner baffle are both provided with a sealing groove on a side away from the outer baffle. The sealing groove is provided with a sealing ring.

8. The lower cover structure according to claim 6, wherein: The inner side of the upper combined panel is connected to the side panel and the outer baffle, and the upper combined panel is provided with a third oil return port, the third oil return port is connected to an oil drain pipeline, and the oil drain pipeline is connected to between the two side panels; The lower cover structure also includes a joining surface baffle, which is arranged in two opposite directions. The joining surface baffles are respectively connected to the two upper joining panels. The joining surface baffles are distributed along the outer sides of the upper joining panels and protrude upward compared to the upper joining panels.

9. A shaft lubrication cover, characterized in that: include: The lower cover structure according to any one of claims 1 to 8; as well as The upper left cover and the upper right cover serving as the upper cover structure are respectively fixedly connected to the two side plates.

10. A finishing mill, characterized in that: The drum-shaped gear coupling of the transmission system of the finishing mill is assembled in the coupling lubrication cover according to claim 9, and the drum-shaped gear coupling is passed through the hole.

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