Pipe jacking machine slewing bearing sealing structure

Abstract

The utility model discloses a kind of rotary support sealing structure of pipe jacking machine, it is related to sealing technical field, including rotary shell and bottom plate, the top end of the bottom plate is fixedly connected with conical ring, the bottom end of the rotary shell is fixedly connected with sealing circular table, in the utility model, the conical ring of bottom plate top end and rotary shell bottom end sharp taper structure adaptive fit, can further close with the clearance reduction between sealing circular table and bottom plate, reduce leakage risk from rotary connection place source;Sealing circular table increases the area of fit with bottom plate, prolongs sealing path;Sealing ring in the surface ring groove of sealing circular table and bottom plate, when generating elastic deformation in the location platform and L-shaped buckle closure, form elastic sealing barrier, triple sealing design superposition, substantially improve the sealing reliability of rotary support in rotating process, completely solve the leakage problem caused by the traditional structure easily due to clearance becomes larger or fit not tight, ensure pipe jacking machine operation stability.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing structure for the slewing bearing of a pipe jacking machine. Background Technology

[0002] A pipe jacking machine is a specialized piece of equipment for trenchless underground construction. Its core function is to drive concrete pipes, steel pipes, etc., along a pre-set path into the ground without damaging surface roads, buildings, or pipelines, completing pipeline laying or tunnel excavation. It is widely used in urban water supply and drainage, gas, power and communication networks, and underground passage construction. A pipe jacking machine consists of three main systems: a jacking system that provides propulsion, a tunneling system that cuts and breaks up the soil, and a guidance and control system that ensures construction accuracy. The guidance and control system includes a slewing bearing mechanism for free guidance within a 360-degree range.

[0003] However, in existing technologies, the slewing bearing mechanism is a key component for achieving directional adjustment. It receives commands from the control system and uses hydraulic oil to drive flexible steering, providing stable power support for the tunneling head to adjust its trajectory in real time. This directly affects the path accuracy and project quality of pipe jacking construction. However, during operation, the hydraulic oil continuously acts on the rotating components to output steering force. This causes the rotating joints of the slewing bearing mechanism to be under constant dynamic friction and pressure changes, making them highly susceptible to hydraulic oil leakage due to wear of the sealing surface, increased clearance, or failure of the sealing structure. Utility Model Content

[0004] The purpose of this utility model is to solve the problems existing in the prior art and to propose a sealing structure for the slewing bearing of a pipe jacking machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a slewing bearing sealing structure for a pipe jacking machine, comprising a slewing shell and a base plate, wherein a conical ring is fixedly connected to the top of the base plate, and a sealing frustum is fixedly connected to the bottom of the slewing shell; the top of the conical ring is provided with a pointed cone shape, and the bottom of the slewing shell is provided with a conical notch; the outer surface of the conical ring and the inner surface of the slewing shell have the same conical slope; a positioning platform is provided at the edge of the sealing frustum; and an L-shaped buckle is fixedly connected to the edge of the base plate; the positioning platform and the L-shaped buckle are movably connected.

[0006] Preferably, the number of positioning platforms is three, and the three positioning platforms are distributed at equal intervals along the edge of the sealing frustum, and the thickness of the positioning platforms is arranged in descending order.

[0007] Preferably, the positioning platform is a trapezoidal structure with low ends and high middle, and the L-shaped buckle slides along the end slope of the positioning platform to the middle to form a fastening.

[0008] Preferably, both the sealing frustum and the base plate have annular grooves on their surfaces, and a sealing ring is provided inside the annular groove.

[0009] Preferably, the outer diameter of the base plate is larger than the inner diameter of the sealing frustum.

[0010] Preferably, a limiting ring is fixedly connected to the upper surface of the base plate, and the inner diameter of the limiting ring is equal to the outer diameter of the sealing frustum.

[0011] Preferably, the thickness of the limiting ring is less than the thickness of the positioning platform.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the conical ring at the top of the base plate fits snugly against the pointed cone structure at the bottom of the slewing shell, allowing it to move closer together as the gap between the sealing frustum and the base plate decreases, thus reducing the risk of leakage at the source of the rotational connection. The sealing frustum increases the contact area with the base plate, extending the sealing path. The sealing rings in the annular grooves on the surface of the sealing frustum and the base plate undergo elastic deformation when the positioning platform and the L-shaped buckle are engaged, forming an elastic sealing barrier. The triple sealing design significantly improves the sealing reliability of the slewing bearing during rotation, completely solving the leakage problem caused by the increased gap or loose fit in traditional structures, and ensuring the operational stability of the pipe jacking machine.

[0013] 2. In this utility model, by setting three equally spaced positioning platforms with varying thicknesses, when engaged with the L-shaped buckle, only the base plate needs to be rotated to achieve engagement or disengagement, making the operation simple and efficient. The limiting ring on the base plate is thinner than the positioning platform, which not only stabilizes and limits the sealing frustum during engagement and prevents it from disengaging, but also ensures that the sealing frustum can be smoothly disengaged when needed, facilitating later maintenance and repair. At the same time, positioning platforms of different thicknesses can provide different pre-tightening forces to the sealing frustum and the base plate as needed, which can adapt to the sealing requirements of the pipe jacking machine under different operating intensities and media environments, enhance the adaptability of the structure to complex working conditions, and improve the overall equipment's flexibility and service life. Attached Figure Description

[0014] Figure 1 This utility model provides a three-dimensional structural diagram of a sealing structure for the slewing bearing of a pipe jacking machine; Figure 2 This utility model provides a partial structural breakdown diagram of the sealing structure of the slewing bearing of a pipe jacking machine; Figure 3 A front plan view of the sealing structure of the slewing bearing of a pipe jacking machine is provided for this utility model; Figure 4 This utility model provides an internal sectional view of the sealing structure of the slewing bearing of a pipe jacking machine.

[0015] Legend: 1. Rotary shell; 2. Sealing frustum; 3. Base plate; 4. Positioning platform; 5. L-shaped buckle; 6. Limiting ring; 7. Ring groove; 8. Sealing ring; 9. Conical ring. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Example 1: As Figure 1 - Figure 4 As shown, this utility model provides a sealing structure for a slewing bearing of a pipe jacking machine, including a slewing shell 1 and a base plate 3. A conical ring 9 is fixedly connected to the top of the base plate 3, and a sealing frustum 2 is fixedly connected to the bottom of the slewing shell 1. The top of the conical ring 9 is provided with a pointed cone shape, and the bottom of the slewing shell 1 is provided with a conical notch. The outer surface of the conical ring 9 and the inner surface of the slewing shell 1 have the same conical slope. A positioning platform 4 is provided at the edge of the sealing frustum 2, and an L-shaped buckle 5 is fixedly connected to the edge of the base plate 3. The positioning platform 4 and the L-shaped buckle 5 are movably connected.

[0019] The specific settings and functions of this embodiment are described below. The slewing shell 1 and the base plate 3 constitute the main structure of the slewing bearing. The slewing shell 1 and the base plate 3 rotate relative to each other, and leakage is prone to occur at the rotation points. Therefore, a sealing design needs to be added at the rotation connection points. A pointed cone adapted to the shape of the conical ring 9 is set at the bottom end of the slewing shell 1. After the slewing shell 1 is fastened onto the base plate 3, the conical ring 9 and the slewing shell 1 fit and align with each other. The smaller the gap between the sealing frustum 2 and the base plate 3, the closer the bottom end of the conical ring 9 and the slewing shell 1 are, and the better the sealing effect is.

[0020] Meanwhile, a sealing frustum 2 is set at the bottom of the rotating shell 1 to increase the contact area between the sealing frustum 2 and the base plate 3, thereby improving the sealing degree between the rotating shell 1 and the base plate 3 and further preventing leakage. A positioning platform 4 is set at the edge of the sealing frustum 2. The sealing frustum 2 and the base plate 3 are firmly locked by the cooperation between the L-shaped buckle 5 and the positioning platform 4. Both ends of the positioning platform 4 are inclined. By rotating the base plate 3 on the bottom surface of the sealing frustum 2, the L-shaped buckle 5 at the top of the base plate 3 can be rotated, so that the L-shaped buckle 5 is moved from the outside of the positioning platform 4 to the middle of the positioning platform 4, thus achieving the effect of sealing and preventing detachment.

[0021] Example 2: Figure 2and Figure 4 As shown, there are three positioning platforms 4, which are evenly spaced along the edge of the sealing frustum 2. The thickness of the positioning platforms 4 decreases sequentially. The positioning platforms 4 are trapezoidal structures with lower ends and a higher middle. The L-shaped buckle 5 slides along the inclined surface of the end of the positioning platform 4 to the middle to form a fastening. Both the sealing frustum 2 and the base plate 3 have annular grooves 7 on their surfaces, and sealing rings 8 are installed inside the annular grooves 7.

[0022] The outer diameter of the base plate 3 is larger than the inner diameter of the sealing frustum 2. A limiting ring 6 is fixedly connected to the upper surface of the base plate 3, and the inner diameter of the limiting ring 6 is equal to the outer diameter of the sealing frustum 2. The thickness of the limiting ring 6 is less than the thickness of the positioning platform 4.

[0023] The overall effect of this embodiment is that by opening annular grooves 7 at corresponding positions on the sealing frustum 2 and the base plate 3, and adding a sealing ring 8 between the two sets of annular grooves 7, a seal is achieved between the sealing frustum 2 and the base plate 3. The sealing ring 8 is supported by elastic materials such as rubber. After the positioning platform 4 and the L-shaped buckle 5 are fastened together, the sealing ring 8 undergoes elastic deformation, thereby providing a sealing effect. A limiting ring 6 is set on the upper surface of the base plate 3. The limiting ring 6 limits the alignment of the sealing frustum 2 and the base plate 3. When the positioning platform 4 and the L-shaped buckle 5 are fastened together, the limiting ring 6 can prevent the sealing frustum 2 from detaching from the base plate 3. When separation is required, the positioning platform 4 and the L-shaped buckle 5 are staggered. Since the thickness of the positioning platform 4 exceeds the height of the limiting ring 6, the sealing frustum 2 can be smoothly detached from the base plate 3 after the positioning platform 4 and the L-shaped buckle 5 are staggered. Moreover, multiple sets of positioning platforms 4 are arranged in arithmetic order according to thickness, which can provide different sizes of preload force to the sealing frustum 2 and the base plate 3 as needed.

[0024] The device's operation and working principle are as follows: The rotating shell 1 and the base plate 3 form a main body that can rotate relative to each other. The conical ring 9 at the top of the base plate 3 fits and aligns with the conical structure at the bottom of the rotating shell 1, reducing the gap and enhancing the sealing performance. The sealing frustum 2 increases the contact area with the base plate 3. The positioning platform 4 on its edge cooperates with the L-shaped buckle 5 on the edge of the base plate 3. Rotating the base plate 3 allows the L-shaped buckle 5 to slide along the inclined surface at the end of the positioning platform 4 to the middle for engagement, achieving sealing and preventing detachment. At the same time, the sealing ring 8 in the annular groove 7 on the surface of the sealing frustum 2 and the base plate 3 undergoes elastic deformation to strengthen the seal. The limiting ring 6 on the base plate 3 limits the sealing frustum 2. Its thickness is less than that of the positioning platform 4, ensuring that it does not detach when engaged and can be easily separated when misaligned. Furthermore, positioning platforms 4 of different thicknesses can provide different pre-tightening forces.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A sealing structure for a slewing bearing of a pipe jacking machine, comprising a slewing shell (1) and a base plate (3), characterized in that: A conical ring (9) is fixedly connected to the top of the base plate (3), and a sealing frustum (2) is fixedly connected to the bottom of the rotary shell (1). The top of the conical ring (9) is provided with a pointed cone shape, and the bottom of the rotary shell (1) is provided with a conical notch. The outer side of the conical ring (9) and the inner side of the rotary shell (1) have the same conical slope. A positioning platform (4) is provided at the edge of the sealing frustum (2), and an L-shaped buckle (5) is fixedly connected to the edge of the base plate (3). The positioning platform (4) and the L-shaped buckle (5) are movably connected.

2. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 1, characterized in that: The number of positioning platforms (4) is three. The three positioning platforms (4) are distributed at equal intervals along the edge of the sealing frustum (2). The thickness of the positioning platforms (4) is arranged in order from large to small.

3. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 1, characterized in that: The positioning platform (4) is a trapezoidal structure with low ends and high middle. The L-shaped buckle (5) slides along the end slope of the positioning platform (4) to the middle to form a buckle.

4. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 1, characterized in that: Both the sealing frustum (2) and the base plate (3) have annular grooves (7) on their surfaces, and a sealing ring (8) is provided inside the annular grooves (7).

5. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 1, characterized in that: The outer diameter of the base plate (3) is larger than the inner diameter of the sealing frustum (2).

6. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 1, characterized in that: A limiting ring (6) is fixedly connected to the upper surface of the base plate (3), and the inner diameter of the limiting ring (6) is equal to the outer diameter of the sealing frustum (2).

7. The sealing structure of the slewing bearing of a pipe jacking machine according to claim 6, characterized in that: The thickness of the limiting ring (6) is less than the thickness of the positioning stage (4).

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