A tunneling machine internal spray seal structure

Abstract

The utility model provides a kind of tunneling machine inner spray sealing structure, including the bushing being installed on main shaft, the side wall on bushing is connected with dynamic ring by limiting part away from main shaft, and water distribution tray is installed in dynamic ring;The position of water distribution tray close to dynamic ring is provided with mounting cavity, first static ring and second static ring are installed in mounting cavity, spring is arranged between the end face of first static ring and second static ring opposite, and the end face of first static ring and second static ring away from spring is pasted with the inside end face of dynamic ring;This structure is formed by static ring and dynamic ring end face sealing structure, and by spring continuous pre-tightening, so that sealing surface is always closely pasted, only spring pressure is generated to the surface of dynamic ring and static ring when high-pressure water flows in, and the friction is small, wear is less, and the service life of sealing system is greatly extended;When high-pressure water flows in, pressure is generated to the friction part of dynamic ring and static ring, can effectively prevent water from leaking from sealing contact surface, and the higher the pressure, the better the sealing.

Description

Technical Field

[0001] This utility model belongs to the field of tunneling machine sealing technology, specifically to a spray sealing structure inside a tunneling machine. Background Technology

[0002] Coal mine roadheaders are mainly used for tunneling coal mine roadways. The cutting head is a key component for crushing coal and rock. Power is transmitted from the motor of the cutting unit to the reducer via a coupling. The reducer then reduces speed and increases torque before transmitting power to the cutting head via the main shaft of the cantilever section. The cutting teeth are specialized crushing tools mounted on the cutting head. Rotating the cutting head drives the cutting teeth to cut and crush the coal and rock. When crushing coal and rock, the cutting head needs to use multiple sprays of water mist from inside the cutting head to cool the cutting teeth, eliminate sparks, and reduce dust generated during cutting at the working face. Without a well-functioning and reliable internal spray system, sparks can easily be generated when the cutting teeth rub against the coal wall during cutting, especially in high-gas coal mines, posing a significant safety hazard. When cutting rock tunnels, the friction between the cutting teeth and the rock easily generates high temperatures, especially in longitudinal shaft tunneling machines. The cutting head is conical with a structure that is larger at the rear and smaller at the front. The external spray at the rear cannot effectively reach the surface of the cutting teeth to cool them. Therefore, the high temperature generated by friction causes the cutting teeth to fail and be damaged quickly, reducing cutting efficiency and slowing the advance rate. Due to the limitations of the cantilever section structure of the tunneling machine's cutting section, the water seal of the internal spray of the tunneling machine mainly uses concentric rotating Glyd rings. Although a small amount of graphite is added inside the seal to achieve a self-lubricating effect, and sometimes lubricant is added between multiple rings to extend the service life of the Glyd ring, the lubricant is relatively small. Coupled with the corrosive effect of high-pressure water, the sealing surface cannot form an effective lubricating film to protect the long-term stable operation of the Glyd ring. Therefore, the service life of the internal spray using Glyd ring water seals is very short, which does not reach the normal service life of the tunneling machine's cutting section. Moreover, after the water seal is damaged, high-pressure water can easily enter the reducer or cantilever section of the cutting section, causing damage to large components. Utility Model Content

[0003] To address the problems of existing tunneling machines using Gladley ring water seals for internal spray sealing, which have a very short service life and cause damage to large components due to high-pressure water entering the reducer or cantilever section of the cutting part after the water seal is damaged, this utility model provides an internal spray sealing structure for tunneling machines.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model proposes an internal spray sealing structure for a tunneling machine, including a bushing installed on the main shaft. A moving ring is connected to the side wall of the bushing away from the main shaft by a limiting member, and a water distribution plate is installed inside the moving ring. The water distribution plate has an installation cavity near the moving ring. A first stationary ring and a second stationary ring are installed in the installation cavity. A spring is provided between the opposite end faces of the first stationary ring and the second stationary ring. The end faces of the first stationary ring and the second stationary ring away from the spring are in contact with the inner end face of the moving ring. The water distribution plate is provided with a water inlet channel. One end of the water inlet channel is connected to a water inlet on the cantilever section housing, and the other end of the water inlet channel is connected to a water passage hole on the second stationary ring in the mounting cavity. The water passage hole is connected to a water outlet on the water distribution plate, and the water outlet is connected to the inner cavity of the moving ring. The inner cavity of the moving ring is connected to a water guide hole on the bushing, and the water guide hole is connected to a water delivery hole on the main shaft.

[0005] Preferably, a first sealing groove is provided on the inner wall of the bushing on both sides of the water guide hole, and a bushing O-ring is installed in the first sealing groove.

[0006] Preferably, a second sealing groove is provided on the outer wall of the bushing corresponding to the position of the moving ring, and an O-ring of the moving ring is installed in the second sealing groove.

[0007] Preferably, the mounting cavity is provided with an annular platform, and the mounting cavity is divided into a first mounting cavity and a second mounting cavity. The first mounting cavity is used to install the first stationary ring, and the second mounting cavity is used to install the second stationary ring.

[0008] Preferably, a third sealing groove is provided on the inner wall of the second stationary ring on both sides of the water passage hole, and an O-ring of the stationary ring is installed in the third sealing groove.

[0009] Preferably, a fourth sealing groove is provided on the outer wall of the second stationary ring on both sides of the water passage hole, and an outer O-ring of the stationary ring is installed in the fourth sealing groove.

[0010] Preferably, a first positioning groove is provided on the inner wall of the bushing near one end, and a first fastening screw is installed on the main shaft within the first positioning groove.

[0011] Preferably, a second positioning groove is provided on the outer wall of the bushing near one end, and a first fastening screw is installed on the main shaft within the second positioning groove.

[0012] Preferably, the limiting member is an elastic retaining ring.

[0013] Preferably, the moving ring is a ceramic ring; the first stationary ring and the second stationary ring are graphite rings.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes an internal spray sealing structure for a tunneling machine. This structure forms an end-face seal through a stationary ring and a rotating ring. Continuous pre-tensioning by a spring ensures a tight seal between the sealing surfaces. Compared to traditional Glyd ring line contact seals, this structure offers a larger contact area and more uniform pressure distribution. Furthermore, when no high-pressure water flows in, only the spring pressure exerts a small pressure on the surfaces of the rotating and stationary rings, resulting in low friction and minimal wear, significantly extending the service life of the sealing system. When high-pressure water flows in, it exerts pressure on the friction surfaces of the rotating and stationary rings, effectively preventing water leakage from the sealing contact surface; higher pressure results in better sealing. The rotating ring is rigidly connected to the bushing via a limiting component. When rotating synchronously with the main shaft, the contact surface experiences uniform force, reducing localized excessive wear and decreasing the frequency of seal replacement.

[0015] Furthermore, in this structure, the water inlet channel of the water distribution plate, the water passage of the second stationary ring, the inner cavity of the moving ring, and the water guide hole on the bushing form a continuous and smooth water delivery path between the main shaft and the cantilever section shell. The water path and the sealing structure are coordinated and adapted to avoid mutual interference, reduce water flow resistance, ensure the stable delivery of high-pressure water to the main shaft water delivery hole, ensure the spray pressure and atomization effect of the internal spray system, and improve the dust suppression efficiency and environmental quality of tunneling operations.

[0016] Furthermore, in this structure, the bushing provides a stable installation reference for the rotating ring, the limiting component precisely restricts the axial displacement of the rotating ring, and the spring can adapt to the slight jumps during the rotation of the main shaft. The combination of rigid positioning and elastic compensation makes the sealing structure adaptable to complex working conditions such as high-speed rotation and vibration of the tunneling machine, thereby improving operational reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a spray sealing structure inside a tunneling machine proposed in this utility model; In the attached diagram: 1. Water distribution plate; 2. First stationary ring; 3. Spring; 4. Second stationary ring; 5. Outer O-ring of stationary ring; 6. Inner O-ring of stationary ring; 7. Bushing; 8. Moving ring; 9. O-ring of moving ring; 10. Limiting element; 11. Bushing O-ring; 12. First set screw; 13. Cutting head; 14. Main shaft; 15. Cantilever section housing. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] This utility model proposes an internal spray sealing structure for a tunneling machine, such as... Figure 1As shown, the assembly includes a bushing 7 mounted on the outer wall of the main shaft 14. A movable ring 8 is connected to the side wall of the bushing 7 away from the main shaft 14 via a limiting member 10. The limiting member 10 is fixed to the outer end of the movable ring 8, stably fixing the movable ring 8 to the outer wall of the bushing 7. The limiting member 10 makes the movable ring 8 and the bushing 7 rigidly connected, so that when the bushing 7 rotates synchronously with the main shaft 14, the contact surface between the movable ring 8 and the bushing 7 is subjected to uniform force, reducing local excessive wear. A water distribution plate 1 is installed inside the movable ring 8. The combination of the bushing 7, the movable ring 8 and the water distribution plate 1 forms a water distribution system and an initial seal between the main shaft 14 and the cantilever section housing 15. Structure: A mounting cavity is provided inside the water distribution plate 1 near the rotating ring 8. The mounting cavity is opened along the axial direction of the main shaft 14. A first stationary ring 2 and a second stationary ring 4 are installed in the mounting cavity. A spring 3 is provided between the opposite end faces of the first stationary ring 2 and the second stationary ring 4. The spring 3 provides a preload force for the first stationary ring 2 and the second stationary ring 4 to fix them to the rotating ring 8, and compensates for the wear of the contact surfaces of the first stationary ring 2 and the second stationary ring 4 with the rotating ring 8 in real time, ensuring that the sealing surfaces are always tightly fitted and avoiding gaps due to wear. The end faces of the first stationary ring 2 and the second stationary ring 4 away from the spring 3 are in contact with the inner end face of the rotating ring 8. The water distribution plate 1 is equipped with... The cutting head 13 is equipped with a water inlet channel. One end of the water inlet channel is connected to a water inlet on the cantilever section housing 15, and the other end is connected to a water passage hole on the second stationary ring 4 inside the mounting cavity. The water passage hole is connected to a water outlet on the water distribution plate 1, and the water outlet is connected to the inner cavity of the moving ring 8. The inner cavity of the moving ring 8 is connected to a water guide hole on the bushing 7, and the water guide hole is connected to a water delivery hole on the main shaft 14. The water to be sprayed from the cutting head 13 is input through the water inlet on the cantilever section housing 15, enters the water passage hole on the second stationary ring 4 through the water inlet channel, and then enters the inner cavity of the moving ring 8, flowing into the water. The water flows through the guide hole on bushing 7, then into the water inlet on main shaft 14, and finally into the spray channel on cutting head 13. The water is sprayed onto cutting head 13. The water inlet channel of cutting head 13 connects to the water inlet of cantilever section housing 15 at one end through the water inlet channel in water distribution plate 1, and to the water outlet through the water passage of second stationary ring 4 at the other end. The water then flows through the inner cavity of moving ring 8, the guide hole of bushing 7, and finally to the water inlet of main shaft 14, forming a continuous, seamless water supply path. This structure uses the first stationary ring 2, second stationary ring 4, and moving ring 8 to form an end-face seal, increasing the sealing contact surface and extending the high-pressure water penetration path. When no high-pressure water flows in, only the pressure of spring 3 exerts a small pressure on the surfaces of moving and stationary rings, resulting in low friction and less wear, significantly extending the service life of the sealing system. When high-pressure water flows in, it exerts pressure on the friction part of moving and stationary rings, effectively preventing water leakage from the sealing contact surface; the higher the pressure, the better the sealing performance.

[0025] like Figure 1As shown, the inner wall of the bushing 7 has first sealing grooves on both sides of the water guide hole. A bushing O-ring 11 is installed in each of the first sealing grooves. The bushing O-ring 11 seals the bushing 7 and the main shaft 14 at the two sides of the water guide hole, improving the sealing performance between the bushing 7 and the main shaft 14 and preventing leakage at the connection between the bushing 7 and the main shaft 14 during water supply to the cutting head 13. A first positioning groove is provided on the inner wall of the bushing 7 near one end. A first fastening screw 12 is installed on the main shaft 14 within the first positioning groove. The first positioning groove and the first fastening screw 12... The engagement of the fastening screw 12 ensures that the bushing 7 rotates synchronously during the rotation of the main shaft 14. A second sealing groove is provided on the outer wall of the bushing 7 corresponding to the position of the rotating ring 8. A rotating ring O-ring 9 is installed in the second sealing groove. The rotating ring O-ring 9 seals the connection between the bushing 7 and the rotating ring 8, improving the sealing performance of the connection between the bushing 7 and the rotating ring 8. A second positioning groove is provided on the outer wall of the bushing 7 near one end. A first fastening screw 12 is also installed on the main shaft 14 in the second positioning groove. The first fastening screw 12 enables the bushing 7 and the rotating ring 8 to rotate synchronously.

[0026] like Figure 1 As shown, an annular platform is provided inside the mounting cavity, which is divided into a first mounting cavity and a second mounting cavity. The first mounting cavity houses the first stationary ring 2, and the second mounting cavity houses the second stationary ring 4. The first and second mounting cavities provide dedicated mounting space and radial positioning reference for the first stationary ring 2 and the second stationary ring 4, respectively. This effectively prevents radial offset, tilting, or mutual interference of the first stationary ring 2 and the second stationary ring 4 during assembly, ensuring that the axes of the first stationary ring 2 and the second stationary ring 4 are highly aligned with the axis of the main shaft 14, guaranteeing the flatness and uniformity of the sealing surface contact, and improving sealing reliability.

[0027] like Figure 1 As shown, a third sealing groove is provided on both sides of the water passage hole on the inner wall of the second stationary ring 4, and an inner O-ring 6 of the stationary ring is installed in the third sealing groove; a fourth sealing groove is provided on both sides of the water passage hole on the outer wall of the second stationary ring 4, and an outer O-ring 5 of the stationary ring is installed in the fourth sealing groove. The connection between the second stationary ring 4 and the second mounting cavity is sealed by the inner O-ring 6 and the outer O-ring 5 of the stationary ring, thereby further improving the sealing performance of this structure.

[0028] In this embodiment, the limiting member 10 is an elastic retaining ring. Two elastic retaining rings are provided. One elastic retaining ring is installed on the outer wall of the bushing 7 near its left end face and fits against the left end face of the moving ring 8. The other elastic retaining ring is installed on the outer wall of the bushing 7 near its right end face and fits against the right end face of the moving ring 8. The moving ring 8 is fixed to the bushing 7 by the two elastic retaining rings, preventing the moving ring 8 from detaching from the bushing 7 during the rotation of the roller by the main shaft 14, which would affect the normal water delivery of the sealing structure.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A spray sealing structure for an internal tunneling machine, characterized in that, Includes a bushing (7) mounted on the main shaft (14), and a moving ring (8) connected to the side wall of the bushing (7) away from the main shaft (14) by a limiting member (10), and a water distribution plate (1) is installed inside the moving ring (8); The water distribution plate (1) is provided with an installation cavity near the moving ring (8). A first stationary ring (2) and a second stationary ring (4) are installed in the installation cavity. A spring (3) is provided between the opposite end faces of the first stationary ring (2) and the second stationary ring (4). The end faces of the first stationary ring (2) and the second stationary ring (4) away from the spring (3) are in contact with the inner end face of the moving ring (8). The water distribution plate (1) is provided with a water inlet channel. One end of the water inlet channel is connected to the water inlet on the cantilever section housing (15). The other end of the water inlet channel is connected to the water passage hole on the second stationary ring (4) in the mounting cavity. The water passage hole is connected to the water outlet on the water distribution plate (1). The water outlet is connected to the inner cavity of the moving ring (8). The inner cavity of the moving ring (8) is connected to the water guide hole on the bushing (7). The water guide hole is connected to the water delivery hole on the main shaft (14).

2. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, The inner wall of the bushing (7) is provided with first sealing grooves on both sides of the water guide hole, and bushing O-rings (11) are installed in the first sealing grooves.

3. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, A second sealing groove is provided on the outer wall of the bushing (7) at the position corresponding to the moving ring (8), and a moving ring O-ring (9) is installed in the second sealing groove.

4. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, An annular platform is provided in the mounting cavity, and the mounting cavity is divided into a first mounting cavity and a second mounting cavity. The first stationary ring (2) is installed in the first mounting cavity, and the second stationary ring (4) is installed in the second mounting cavity.

5. The spray sealing structure inside a tunneling machine according to claim 4, characterized in that, The inner wall of the second stationary ring (4) is provided with a third sealing groove on both sides of the water passage hole, and an O-ring (6) is installed in the third sealing groove.

6. The spray sealing structure inside a tunneling machine according to claim 4, characterized in that, The second stationary ring (4) has a fourth sealing groove on the outer wall located on both sides of the water passage hole, and an outer O-ring (5) of the stationary ring is installed in the fourth sealing groove.

7. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, A first positioning groove is provided on the inner wall of the bushing (7) near one end, and a first fastening screw (12) is installed on the main shaft (14) in the first positioning groove.

8. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, A second positioning groove is provided on the outer wall of the bushing (7) near one end, and a first fastening screw (12) is installed on the main shaft (14) in the second positioning groove.

9. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, The limiting member (10) is an elastic retaining ring.

10. The spray sealing structure inside a tunneling machine according to claim 1, characterized in that, The moving ring (8) is a ceramic ring; the first stationary ring (2) and the second stationary ring (4) are graphite rings.

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