A high-torque reducer for mining cars

Abstract

This utility model discloses a high-torque reducer for mining cars, belonging to the field of mining equipment transmission technology. Its key technical features include an upper housing and a lower housing. A high-torque gear transmission assembly is installed inside both the upper and lower housings. A sealing assembly is installed between the upper and lower housings. This application solves the gap problem at the joint surface of the upper and lower housings from two dimensions: "source-level anti-loosening + active gap filling." The annular groove at the top of the lower housing provides precise installation positioning for the nitrile rubber gasket, ensuring tight contact between the gasket and the bottom of the upper housing. Initial assembly forms a reliable basic seal, blocking the initial channels for grease leakage and dust intrusion. Simultaneously, the anti-loosening bolt structure effectively suppresses loosening of the upper and lower housings caused by mining car vibration, maintaining continuous pressure from the upper housing on the nitrile rubber gasket and preventing the nitrile rubber gasket from rebounding due to insufficient pre-tightening force, thus preventing gaps.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology for mining equipment, and in particular to a high-torque reducer for mining cars. Background Technology

[0002] Mining cars are responsible for transporting ore and slag in mining operations. They need to operate continuously under heavy loads (20-50t per car), strong vibrations (10-50Hz vibration frequency), and high dust conditions. As the core of the transmission, the stability of the reducer's housing connection directly affects the equipment's lifespan and the mine's production efficiency.

[0003] However, existing high-torque reducers for mining cars generally adopt a bolted combination structure of "upper housing + lower housing," which is fixed by circumferential high-strength bolts and sealed at the joint surface with rubber gaskets. But in the actual working conditions of continuous strong vibration in mining cars, there are obvious structural defects: vibration will cause the friction between the bolt threads to decrease, causing the bolt preload to gradually decrease and loosen. Insufficient preload will cause the rubber gasket to rebound elastically, resulting in gaps at the joint surface of the upper and lower housings, which will lead to a series of problems. On the one hand, the grease in the housing leaks from the gaps, causing insufficient gear lubrication and aggravating gear wear. On the other hand, dust in the mining environment enters through the gaps and mixes with the residual grease to form "abrasives," further damaging gears, bearings and other components. This not only shortens the service life of core components, but also requires frequent shutdowns for grease replenishment, and may even cause gear jamming due to sudden lubrication failure, affecting the continuity of mine transportation.

[0004] Therefore, a high-torque reducer for mining trucks is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a high-torque reducer for mining cars, which solves the problem that existing high-torque reducers for mining cars generally adopt a bolted combination structure of "upper shell + lower shell", which is fixed by circumferential high-strength bolts and sealed with rubber gaskets. However, in the actual working conditions of continuous strong vibration in mining cars, there are obvious structural defects: vibration will cause the friction between the bolt threads to decrease, causing the bolt preload to gradually decrease and loosen. Insufficient preload will cause the rubber gasket to rebound elastically, resulting in gaps at the joint surface of the upper and lower shells, which will lead to a series of problems. On the one hand, the grease in the shell will leak from the gaps, resulting in insufficient gear lubrication and aggravating gear wear. On the other hand, dust in the mining environment will enter through the gaps and mix with the residual grease to form "abrasive", further damaging gears, bearings and other components. This not only shortens the service life of core components, but also requires frequent shutdowns for grease replenishment, and may even cause gear jamming due to sudden lubrication failure, affecting the continuity of mining transportation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-torque reducer for mining cars, comprising an upper housing and a lower housing, wherein a high-torque gear transmission assembly is provided inside the upper housing and the lower housing, a sealing assembly is provided between the upper housing and the lower housing, and a base structure is provided at the bottom of the lower housing;

[0007] The sealing assembly includes an annular groove on the top of the lower housing, with a nitrile rubber gasket embedded inside the annular groove. The top of the nitrile rubber gasket contacts the bottom of the upper housing. An annular glue reservoir is formed on the top of the nitrile rubber gasket, and the annular glue reservoir is filled with oil-swellable sealant. An anti-loosening bolt structure is provided between the upper and lower housings.

[0008] Preferably, the anti-loosening bolt structure includes a lower through hole, which is circumferentially and evenly opened on the top of the lower housing, and an upper through hole is circumferentially and evenly opened on the top of the upper housing, with a positioning nut welded to the bottom of the lower through hole.

[0009] Preferably, a fastening bolt is provided inside the upper through hole, and the bottom of the fastening bolt is threadedly connected to the positioning nut through the inside of the lower through hole.

[0010] Preferably, a serrated anti-loosening washer is fitted on the outside of the fastening bolt, and the serrated anti-loosening washer is located at the top of the upper through hole.

[0011] Preferably, the base structure includes a base plate welded to the bottom of the lower housing, and mounting blocks are welded to the front and rear sides of both sides of the base plate.

[0012] Preferably, the top of the mounting block has a waist-shaped mounting hole, and a shock-absorbing rubber sleeve is bonded inside the waist-shaped mounting hole. A connecting bolt is provided inside the shock-absorbing rubber sleeve.

[0013] Preferably, the oil-swellable sealant has an expansion rate of 200%, and the nitrile rubber gasket has a thickness of 5 mm.

[0014] Preferably, the serrated anti-loosening washer is made of 65Mn spring steel with a thickness of 2mm, and the serration height on the upper and lower sides is 0.3-0.5mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This application solves the gap problem at the joint surface of the upper and lower shells from two dimensions: "source-based anti-loosening + active gap filling" by setting a sealing component. The annular groove at the top of the lower shell provides precise installation positioning for the nitrile rubber gasket, ensuring that the gasket is in close contact with the bottom of the upper shell. The initial assembly forms a reliable basic seal, blocking the initial channel for grease leakage and dust intrusion. At the same time, the anti-loosening bolt structure can effectively suppress the loosening of the upper and lower shells caused by the vibration of the mine car, maintain the continuous pressure of the upper shell on the nitrile rubber gasket, and prevent the nitrile rubber gasket from rebounding due to insufficient pre-tightening force and forming gaps. Even if the vibration causes a very small gap, the grease in the lower shell will seep into the annular rubber storage groove at the top of the nitrile rubber gasket, triggering the expansion of the oil-swellable sealant, automatically filling the gap and forming a "secondary sealing barrier". This not only prevents grease leakage to ensure the lubrication needs of the internal high-torque gear transmission components, but also blocks the intrusion of external dust to avoid the formation of "abrasive" that damages gears and bearings, ultimately solving the problems of accelerated component wear and shortened lifespan in the prior art.

[0017] 2. By setting up a base structure, this application can provide a stable installation foundation for the upper and lower housings of the reducer and the high-torque gear transmission components, reduce the transmission of vibration during mine car operation to the connection between the upper and lower housings, reduce the decay rate of various bolt preloads, and, together with sealing components and anti-loosening bolt structures, further ensure the connection stability between the upper and lower housings, reduce the risk of downtime for grease replenishment and gear jamming due to equipment failure, and ensure the continuity of mine transportation. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the high-torque reducer for mining cars according to this utility model.

[0019] Figure 2 This is a structural diagram of the upper and lower shells of this utility model;

[0020] Figure 3 This is a structural diagram of the sealing assembly of this utility model;

[0021] Figure 4 This is a structural diagram of the anti-loosening bolted structure of this utility model;

[0022] Figure 5 This is a structural diagram of the base structure of this utility model.

[0023] In the diagram, 1. Lower housing; 2. Upper housing; 3. High-torque gear transmission assembly; 4. Sealing assembly; 41. Annular groove; 42. Nitrile rubber gasket; 43. Annular rubber reservoir; 44. Oil-swellable sealant; 45. Anti-loosening bolt structure; 451. Lower through hole; 452. Upper through hole; 453. Positioning nut; 454. Fastening bolt; 455. Serrated anti-loosening washer; 5. Base structure; 51. Base plate; 52. Mounting block; 53. Waist-shaped mounting hole; 54. Shock-absorbing rubber sleeve; 55. Connecting bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 The present invention provides the following technical solution:

[0026] A high-torque reducer for mining cars includes an upper housing 2 and a lower housing 1. A high-torque gear transmission assembly 3 is provided inside the upper housing 2 and the lower housing 1. A sealing assembly 4 is provided between the upper housing 2 and the lower housing 1. A base structure 5 is provided at the bottom of the lower housing 1.

[0027] The sealing assembly 4 includes an annular groove 41 opened at the top of the lower housing 1, a nitrile rubber sealing gasket 42 embedded inside the annular groove 41, the top of the nitrile rubber sealing gasket 42 contacting the bottom of the upper housing 2, an annular glue storage groove 43 opened at the top of the nitrile rubber sealing gasket 42, the annular glue storage groove 43 being filled with oil-swellable sealant 44, and an anti-loosening bolt structure 45 being provided between the upper housing 2 and the lower housing 1.

[0028] In this embodiment, by setting up an upper housing 2, a lower housing 1, a high-torque gear transmission assembly 3, a sealing assembly 4, and a base structure 5, stable operation of the mine car reducer under heavy load and strong vibration environment is achieved. During assembly, the nitrile rubber sealing gasket 42 is first embedded into the annular groove 41 at the top of the lower housing 1 to ensure that the nitrile rubber sealing gasket 42 is accurately positioned and its top surface is flat. After the upper housing 2 is closed, the nitrile rubber sealing gasket 42 and the bottom of the upper housing 2 are tightly fitted to form an initial sealing surface. The upper housing 2 and the lower housing 1 are fastened by the anti-loosening bolt structure 45, so that the nitrile rubber sealing gasket 42 is subjected to continuous pressure, further strengthening the basic sealing effect and blocking the path of lubricant leakage and dust intrusion. When the mine car generates continuous vibration during operation, the anti-loosening bolt structure 45 can effectively resist the loosening tendency caused by vibration. Maintaining the pressure of the upper housing 2 and lower housing 1 on the nitrile rubber gasket 42 reduces gaps caused by preload decay. If vibration causes minor gaps, the grease in the lower housing 1 will naturally seep into the annular rubber reservoir 43 at the top of the nitrile rubber gasket 42. After contacting the oil-expanding sealant 44, it will expand and quickly fill the gap to form a secondary seal, preventing continuous grease leakage and dust intrusion. The base structure 5 provides stable support for the entire reducer, reduces the transmission intensity of mine car vibration to the connection between the lower housing 1 and the upper housing 2, indirectly reduces the load on the anti-loosening bolt structure 45, and forms a synergistic protection with the sealing assembly 4, ensuring that the internal high-torque gear transmission assembly 3 is always in a good lubrication environment, reducing failures caused by wear, and ensuring the continuous and stable operation of the reducer.

[0029] Specifically, such as Figure 4 As shown, the anti-loosening bolt structure 45 includes a lower through hole 451, which is evenly opened in the circumferential direction on the top of the lower housing 1. An upper through hole 452 is evenly opened in the circumferential direction on the top of the upper housing 2. A positioning nut 453 is welded to the bottom of the lower through hole 451.

[0030] Specifically, such as Figure 4 As shown, a fastening bolt 454 is provided inside the upper through hole 452, and the bottom of the fastening bolt 454 is threadedly connected to the positioning nut 453 through the inside of the lower through hole 451.

[0031] Specifically, such as Figure 4 As shown, a serrated anti-loosening washer 455 is fitted on the outside of the fastening bolt 454, and the serrated anti-loosening washer 455 is located at the top of the upper through hole 452.

[0032] In this embodiment: by setting the anti-loosening bolt connection structure 45, during assembly, the fastening bolt 454 is first passed through the upper through hole 452 of the upper housing 2, and then through the lower through hole 451 of the lower housing 1, and threadedly connected to the positioning nut 453 welded to the bottom of the lower through hole 451. The welding and fixing of the positioning nut 453 to the lower housing 1 avoids the problem of the traditional nut rotating with vibration, and provides a stable force base for the bolt. During the tightening of the fastening bolt 454, the serrated anti-loosening washer 455 on the outside of the fastening bolt 454 is pressed tight. At the top of the upper perforation 452, the lower side serrations engage with the surface of the upper housing 2, and the upper side serrations engage with the bottom surface of the head of the fastening bolt 454, forming a two-way mechanical lock. This prevents the fastening bolt 454 from rotating due to vibration. Even if the mine car continues to vibrate, causing fluctuations in the friction of the threaded pair, the rigid fixing of the positioning nut 453 and the engagement of the serrated anti-loosening washer 455 can still maintain the preload of the fastening bolt 454, ensuring the continuous pressure of the upper housing 2 on the nitrile rubber sealing gasket 42, thus structurally reducing the generation of gaps at the joint surface.

[0033] Specifically, such as Figure 5 As shown, the base structure 5 includes a base plate 51 welded to the bottom of the lower housing 1, and mounting blocks 52 are welded to the front and rear sides of both sides of the base plate 51.

[0034] Specifically, such as Figure 5 As shown, the top of the mounting block 52 has a waist-shaped mounting hole 53, and a shock-absorbing rubber sleeve 54 is bonded inside the waist-shaped mounting hole 53. A connecting bolt 55 is provided inside the shock-absorbing rubber sleeve 54.

[0035] In this embodiment: by setting a base structure 5, the bottom plate 51 welded to the bottom of the lower housing 1 and the mounting blocks 52 on both sides front and rear form an overall support frame. The waist-shaped mounting hole 53 on the top of the mounting block 52 provides installation and adjustment space for the reducer to adapt to the installation error of the mine car frame. The shock-absorbing rubber sleeve 54 bonded in the waist-shaped mounting hole 53 wraps the connecting bolt 55. When the mine car vibrates during operation, the shock-absorbing rubber sleeve 54 absorbs the vibration energy through its own elastic deformation, reducing the vibration intensity transmitted from the frame to the lower housing 1 through the connecting bolt 55. At the same time, the waist-shaped mounting hole 53 allows the bottom plate 51 to adapt to the vibration within a small range, avoiding stress concentration caused by rigid connection, indirectly reducing the vibration load borne by the anti-loosening bolt structure 45. Together with the sealing component 4 and the anti-loosening bolt structure 45, a synergistic shock absorption system is formed, further ensuring the connection stability between the lower housing 1 and the upper housing 2.

[0036] Specifically, such as Figure 3 As shown, the oil-swellable sealant 44 has an expansion rate of 200%, and the nitrile rubber gasket 42 has a thickness of 5 mm.

[0037] Specifically, such as Figure 4As shown, the 455 serrated anti-loosening washer is made of 65Mn spring steel with a thickness of 2mm, and the serration height on the upper and lower sides is 0.3-0.5mm.

[0038] In this embodiment: the 5mm thick nitrile rubber sealing gasket 42 has sufficient elasticity and can be moderately compressed under the pre-tightening force of the anti-loosening bolt structure 45 to ensure the tight fit of the initial sealing surface. When vibration causes a small gap, the oil-expanding sealant 44 (expansion rate 200%) in the annular glue reservoir 43 expands rapidly after encountering grease, and its expansion is sufficient to fill the gap and form a secondary seal. At the same time, the 2mm thick 65Mn serrated anti-loosening washer 455 has both elasticity and rigidity. It can produce a small deformation with the pre-tightening force of the fastening bolt 454 to compensate for the vibration gap, and can also provide a lasting anti-loosening force through serrated engagement. It works with the positioning nut 453 to maintain the compression state of the nitrile rubber sealing gasket 42. The three parameters work together to achieve progressive protection of "pre-tightening to ensure sealing - vibration to prevent loosening - gap self-filling", ensuring that the joint surface of the upper shell 2 and the lower shell 1 always maintains the sealing integrity under heavy load and strong vibration environment, and ensuring the reliable operation of the internal high torque gear transmission assembly 3.

[0039] Working Principle: During the installation and use of the high-torque reducer for mining cars, the equipment is first assembled: A 5mm thick nitrile rubber gasket 42 is embedded into the annular groove 41 at the top of the lower housing 1. The annular groove 41 precisely limits the nitrile rubber gasket 42, ensuring its top surface is flat. After closing the upper housing 2, the nitrile rubber gasket 42 fits tightly against the bottom of the upper housing 2, initially blocking grease leakage and dust intrusion. Next, the anti-loosening bolt structure 45 is installed. The fastening bolt 454 is passed sequentially through the upper through hole 452 of the upper housing 2 and the lower through hole 451 of the lower housing 1, and threadedly connected to the positioning nut 453 welded to the bottom of the lower through hole 451. The welding and fixing of the positioning nut 453 prevents the traditional nut from rotating with vibration, providing stability for the fastening bolt 454. A fixed load-bearing foundation is established. Simultaneously, a 2mm thick 65Mn spring steel serrated anti-loosening washer 455 is placed on the outside of the fastening bolt 454. When the fastening bolt 454 is tightened, the serrated anti-loosening washer 455 is pressed against the top of the upper through hole 452. The lower serrations engage with the surface of the upper housing 2, and the upper serrations engage with the bottom surface of the head of the fastening bolt 454, forming a two-way mechanical lock to prevent the fastening bolt 454 from rotating due to vibration. Finally, the base structure 5 is installed: the base plate 51 welded to the bottom of the lower housing 1 and the mounting blocks 52 on both sides form a support frame. The connecting bolt 55 is passed through the shock-absorbing rubber sleeve 54 in the waist-shaped mounting hole 53 at the top of the mounting block 52 and fixed to the mine car frame. The waist-shaped mounting hole 53 can accommodate frame installation errors, and the shock-absorbing rubber sleeve 54 covers... The connecting bolt 55 is wrapped to prepare for subsequent vibration reduction. When the mine car starts running, the various structures enter a coordinated working state: when the high-torque gear transmission assembly 3 transmits power in the cavity enclosed by the upper shell 2 and the lower shell 1, the base structure 5 takes the lead in functioning. The vibration generated by the mine car's movement is transmitted to the connecting bolt 55 through the frame. The vibration-damping rubber sleeve 54 absorbs vibration energy through elastic deformation, reducing the intensity of vibration transmission to the upper shell 2 and the lower shell 1. At the same time, the waist-shaped mounting hole 53 allows the base plate 51 to move slightly with vibration, avoiding stress concentration caused by rigid connection, and indirectly reducing the vibration load of the anti-loosening bolt structure 45. Even if some vibration is still transmitted to the connection between the upper shell 2 and the lower shell 1, the positioning nut 453 and the serrated anti-loosening washer 45 of the anti-loosening bolt structure 45 can still function. 5. Coordinated resistance to loosening of fastening bolts 454, maintaining continuous pressure of the upper housing 2 on the nitrile rubber gasket 42, preventing the nitrile rubber gasket 42 from rebounding due to pre-tightening force attenuation. If the vibration intensity is large, causing a small gap to appear at the joint surface of the upper housing 2 and the lower housing 1, the grease in the lower housing 1 will naturally seep into the annular rubber storage groove 43 at the top of the gasket, and come into contact with the oil-swellable sealant 44 (expansion rate 200%) filled in the groove. The oil-swellable sealant 44 expands rapidly and fills the gap, forming a secondary sealing barrier, completely blocking grease leakage and dust intrusion, ensuring that the high torque gear transmission assembly 3 is always in a sufficiently lubricated environment without abrasive interference, reducing component wear failures, and ultimately achieving long-term stable operation of the reducer under heavy load and strong vibration conditions.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-torque reducer for mining cars, comprising an upper housing (2) and a lower housing (1), characterized in that: The upper housing (2) and the lower housing (1) are provided with a high torque gear transmission assembly (3), a sealing assembly (4) is provided between the upper housing (2) and the lower housing (1), and a base structure (5) is provided at the bottom of the lower housing (1). The sealing assembly (4) includes an annular groove (41) opened at the top of the lower housing (1), and a nitrile rubber gasket (42) is embedded inside the annular groove (41). The top of the nitrile rubber gasket (42) contacts the bottom of the upper housing (2). An annular glue storage groove (43) is opened at the top of the nitrile rubber gasket (42). The annular glue storage groove (43) is filled with oil-swellable sealant (44). An anti-loosening bolt structure (45) is provided between the upper housing (2) and the lower housing (1).

2. The high-torque reducer for mining cars according to claim 1, characterized in that: The anti-loosening bolt structure (45) includes a lower through hole (451), which is evenly opened in the circumferential direction on the top of the lower housing (1). The upper housing (2) is evenly opened in the circumferential direction on the top. A positioning nut (453) is welded to the bottom of the lower through hole (451).

3. A high-torque reducer for mining cars according to claim 2, characterized in that: The upper through hole (452) is provided with a fastening bolt (454), and the bottom of the fastening bolt (454) is threadedly connected to the positioning nut (453) through the lower through hole (451).

4. A high-torque reducer for mining cars according to claim 3, characterized in that: A serrated anti-loosening washer (455) is fitted on the outside of the fastening bolt (454), and the serrated anti-loosening washer (455) is located at the top of the upper through hole (452).

5. A high-torque reducer for mining cars according to claim 1, characterized in that: The base structure (5) includes a base plate (51) welded to the bottom of the lower housing (1), and mounting blocks (52) are welded to the front and rear sides of both sides of the base plate (51).

6. A high-torque reducer for mining cars according to claim 5, characterized in that: The top of the mounting block (52) is provided with a waist-shaped mounting hole (53), and a shock-absorbing rubber sleeve (54) is bonded inside the waist-shaped mounting hole (53). A connecting bolt (55) is provided inside the shock-absorbing rubber sleeve (54).

7. A high-torque reducer for mining cars according to claim 1, characterized in that: The thickness of the nitrile rubber sealing gasket (42) is 5 mm.

8. A high-torque reducer for mining cars according to claim 4, characterized in that: The serrated anti-loosening washer (455) is made of 65Mn spring steel with a thickness of 2mm.

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