Sealing device for hinging mechanism of shield tunneling machine and using method of sealing device

Abstract

The invention relates to the technical field of shield tunneling machines, in particular to a sealing device for a shield tunneling machine hinging mechanism and a using method thereof.The sealing device comprises a ring sleeve and a movable ring, and the ring sleeve comprises a first ring sleeve and a second ring sleeve which are symmetrically arranged at intervals and connected with a middle shield; the movable ring comprises a first movable ring body and a second movable ring body which are matched with the first ring sleeve and the second ring sleeve respectively and connected with the front shield, cavities are formed in the ring sleeves and the movable ring bodies, and a movable pressing block is installed at the bottom of the interval between the first movable ring body and the second movable ring body in an up-down sliding mode. And a connected oil path is arranged at the top of a gap between the first ring sleeve and the second ring sleeve in the middle shield. The sealing oil film can be timely filled while being consumed, regular supplementing or checking at any time is not needed, and therefore the sealing effect is prevented from being reduced, the service life of a sealing piece is prolonged, supplementing of sealing lubricating oil is facilitated, operation is simplified, and time and labor are saved.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a sealing device for a hinge mechanism of a shield machine and a use method thereof. Background Art

[0002] As an efficient and safe underground tunnel boring equipment, shield machines are widely used in infrastructure construction such as urban subways, water conservancy projects, and cross-river tunnels. During the excavation process, shield machines need to pass through complex and changeable geological conditions and withstand huge stratum pressure and water and soil pressure.

[0003] As one of the key components of the shield machine, the articulated mechanism connects the front shield and the middle shield of the shield machine. Its main function is to allow a certain angle of deflection between the two to adapt to complex geological conditions and changes in the excavation direction. During the excavation of the shield machine, since a certain pressure needs to be maintained in the soil bin to resist the water and soil pressure of the excavation face, all channels connected to the soil bin must be blocked to prevent the loss of pressure in the soil bin, thereby ensuring the stability of the excavation face. Therefore, an articulated sealing ring is designed at the articulated position to ensure a relative balance of pressure in the soil bin; when the shield machine turns, the shield body will have a certain angle at the articulated position through the extension or retraction of the articulated cylinder, so that the gap in one part of the articulated position will increase, and the gap in the other part will decrease. Through the elastic compression of the articulated seal, it can be ensured that when the gap decreases or increases, the sealing ring can effectively fill the gap, thereby ensuring the external sealing performance of the shield body; at the same time, through the angle deflection of the shield body, the shield machine can smoothly achieve turning excavation.

[0004] However, while the articulated mechanism can achieve flexible deflection, it also faces severe sealing challenges. Due to the relative movement of the articulated parts, traditional static sealing methods are difficult to meet its sealing requirements. Once the seal fails, external media such as mud, water, and mortar will invade the shield machine, causing serious consequences such as equipment damage, construction safety hazards, and environmental pollution.

[0005] To solve the above problems, in the prior art, a hinged sealing device is provided between the middle shield and the front shield, that is, an arc-shaped ring sleeve and a sealing ring that fit each other, plus an oil film seal and a balance between the internal pressure and the external pressure, which is sufficient to solve the above technical problems.

[0006] However, as the use time increases, the excavation and steering activities proceed, and under the influence of internal pressure, the oil film between the seals will be consumed faster; because the oil film and the oil stock are in a closed environment, their specific conditions cannot be observed, and it is easy to cause the seal lubricant to not be replenished after the oil film is consumed, which not only reduces the sealing effect, but also rapidly consumes the service life of the seal. In addition, when the sealing device uses air pressure seals, it is difficult to directly replenish the seal lubricant, and a whole set of complex steps or devices are required, which is time-consuming and labor-intensive. Summary of the invention

[0007] The present invention provides a sealing device for a hinge mechanism of a shield machine and a use method thereof to solve the problems raised in the above background technology.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A sealing device for a shield machine hinge mechanism comprises a ring sleeve and a movable ring arranged between a front shield and a middle shield, wherein the connecting surface between the ring sleeve and the movable ring is an arc surface, the ring sleeve comprises a first ring sleeve and a second ring sleeve which are symmetrically arranged at intervals and connected to the middle shield, the movable ring comprises a first movable ring and a second movable ring which are respectively adapted to the first ring sleeve and the second ring sleeve and connected to the front shield, a cavity for accommodating sealing lubricating oil is formed in the ring sleeve and the movable ring, a movable pressure block is installed at the bottom of the interval between the first movable ring and the second movable ring in the front shield for sliding up and down, and an oil path connected is arranged at the top of the interval between the first ring sleeve and the second ring sleeve in the middle shield for conveying the sealing lubricating oil into the cavity.

[0010] As a preferred solution of the present invention, the oil circuit includes an oil pipe arranged in the middle shield, one end of the oil pipe is connected to the oil tank through an oil pump, and the other end of the oil pipe extends to the cavity and is provided with an oil outlet.

[0011] As a preferred solution of the present invention, a one-way valve is also provided in the oil pipe.

[0012] As a preferred solution of the present invention, a cylinder is installed at the bottom of the movable pressing block in the front shield, and the output end of the cylinder is connected to the bottom of the movable pressing block.

[0013] As a preferred solution of the present invention, installation grooves are respectively arranged in the bottom arc surfaces of the first ring sleeve and the second ring sleeve, and sealing rings respectively adapted to the first movable ring and the second movable ring are arranged in the installation grooves.

[0014] As a preferred solution of the present invention, a rubber seal is installed on one side of the movable ring on the front shield, and the top of the rubber seal is used to fit tightly with the middle shield.

[0015] As a preferred solution of the present invention, an emergency sealing airbag is provided at the bottom of the rubber seal, and the lower end of the emergency sealing airbag is connected to the air tank through an air nozzle connected thereto, for inflating the emergency sealing airbag.

[0016] As a preferred solution of the present invention, a sealing baffle ring with a top close to the middle shield is provided on one side of the front shield; and a sealing baffle ring with a bottom close to the front shield is provided on one side of the middle shield.

[0017] As a preferred solution of the present invention, a method for using the sealing device comprises the following steps:

[0018] S1, initial installation of the sealing device, fixing the first ring sleeve, the second ring sleeve, the first movable ring and the second movable ring on the front shield and the middle shield according to the set positions;

[0019] S2, filling of sealing lubricating oil, starting the oil circuit, inputting the sealing lubricating oil into the cavity of the ring sleeve and the movable ring to fill the entire cavity;

[0020] S3, the operation of the sealing device, controls the movable pressure block to squeeze the sealing lubricating oil in the cavity upward, cooperates with the movement of the hinge mechanism to replenish the oil film between the ring sleeve and the movable ring in time, and at the same time increases the pressure in the cavity by squeezing;

[0021] S4. Inspection and maintenance of the sealing device. With the long-term use of the device, the sealing lubricating oil in the cavity is continuously consumed. When it is detected that replenishment is needed, the movable pressure block is controlled to slide downward, and the oil circuit is started again to input the sealing lubricating oil into the cavity, filling the space in the cavity again, and completing the replacement of the sealing lubricating oil.

[0022] The beneficial effects of the present invention are:

[0023] 1. Through the cooperation of the segmented ring sleeve and the movable ring, a cavity that can accommodate the sealing lubricating oil can be separated therein. During the operation of the shield machine and the articulated mechanism, the sealing oil film will be consumed and filled in time at the same time, without the need for regular replenishment or inspection at any time, thereby avoiding the reduction of the sealing effect and increasing the service life of the seal.

[0024] 2. Through the cooperation of the ring sleeve, the cavity in the movable ring and the movable pressure block, the pneumatic seal can be replaced, and at the same time, the replenishment of the sealing lubricating oil is further facilitated, the operation is simplified, and time and labor are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view structural schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0027] The text labels in the figure are as follows: 1. middle shield; 2. front shield; 3. oil tank; 4. oil pump; 5. first connecting piece; 6. oil cylinder; 7. second connecting piece; 8. oil pipe; 9. one-way valve; 10. oil outlet; 11. first ring sleeve; 12. first movable ring; 13. second ring sleeve; 14. second movable ring; 15. sealing ring; 16. cylinder; 17. movable pressure block; 18. rubber seal; 19. emergency sealing airbag; 20. air nozzle; 21. air tank; 22. sealing retaining ring. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0029] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0030] like Figure 1 , Figure 2 As shown, a sealing device for a shield machine hinge mechanism comprises a ring sleeve and a movable ring arranged between a front shield 2 and a middle shield 1, wherein a second connecting member 7 is arranged at the lower end of the front shield 2, and a first connecting member 5 is arranged at the lower end of the middle shield 1, wherein the first connecting member 5 and the second connecting member 7 are connected via an oil cylinder 6, wherein the mounting end of the oil cylinder 6 is hinged to the first connecting member 5, and the output end of the oil cylinder 6 is hinged to the second connecting member 7, and the relative movement, i.e., the deflection, between the front shield 2 and the middle shield 1 is controlled by extending and retracting the output end of the oil cylinder 6 at different positions; the connecting surface between the ring sleeve and the movable ring is an arc surface, i.e., the movable ring slides along the arc surface in the ring sleeve, The ring sleeve includes a first ring sleeve 11 and a second ring sleeve 13 which are symmetrically spaced and connected to the middle shield 1. The movable ring includes a first movable ring 12 and a second movable ring 14 which are respectively adapted to the first ring sleeve 11 and the second ring sleeve 13 and connected to the front shield 2. A cavity for accommodating sealing lubricating oil is formed in the ring sleeve and the movable ring. A movable pressing block 17 is installed at the bottom of the interval between the first movable ring 12 and the second movable ring 14 in the front shield 2 for sliding up and down. An oil passage connected to the top of the interval between the first ring sleeve 11 and the second ring sleeve 13 is provided in the middle shield 1 for conveying the sealing lubricating oil to the cavity.

[0031] like Figure 1 As shown, further, the oil circuit includes an oil pipe 8 arranged in the middle shield 1, one end of the oil pipe 8 is connected to the oil tank 3 through the oil pump 4, and the other end of the oil pipe 8 extends to the cavity and is provided with an oil outlet 10.

[0032] like Figure 1As shown, further, a one-way valve 9 is also provided in the oil pipe 8.

[0033] Specifically, start the oil pump 4 to extract the sealing lubricating oil stored in the oil tank 3, and input the sealing lubricating oil from the oil outlet 10 into the cavity through the oil pipe 8; at the same time, as the movable pressure block 17 applies pressure to the cavity, the one-way valve 9 in the oil pipe 8 can effectively prevent the sealing lubricating oil in the cavity from flowing back.

[0034] like Figure 2 As shown, further, a cylinder 16 is installed at the bottom of the movable pressing block 17 in the front shield 2, and the output end of the cylinder 16 is connected to the bottom of the movable pressing block 17. The sliding of the movable pressing block 17 connected thereto is controlled by the extension and contraction of the output end of the cylinder 16.

[0035] like Figure 2 As shown, further, the first ring sleeve 11 and the second ring sleeve 13 are provided with installation grooves at intervals in the bottom arc surface, and the installation grooves are provided with sealing rings 15 respectively adapted to the first movable ring 12 and the second movable ring 14. The sealing rings 15 arranged at intervals in the ring sleeves further improve the sealing effect of the device.

[0036] like Figure 2 As shown, further, a rubber seal 18 is installed on one side of the movable ring on the front shield 2 , and the top of the rubber seal 18 is used to fit tightly with the middle shield 1 .

[0037] like Figure 2 As shown, further, an emergency sealing airbag 19 is provided at the bottom of the rubber seal 18 , and the lower end of the emergency sealing airbag 19 is connected to a gas tank 21 through an air nozzle 20 communicated therewith, for inflating the emergency sealing airbag 19 .

[0038] Specifically, under normal conditions, the rubber seal 18 blocks the gap caused by the relative movement between the front shield 2 and the middle shield 1, further improving the sealing effect of the device; under emergency conditions, emergency sealing is required, and the switch of the gas tank 21 is started at this time, and the gas is inflated into the emergency sealing airbag 19 through the gas nozzle 20, so that the emergency sealing airbag 19 expands to block all the gaps to complete the emergency sealing.

[0039] like Figure 2 As shown, further, a sealing retaining ring 22 is provided on one side of the front shield 2, the top of which is close to the middle shield 1; and a sealing retaining ring 22 is provided on one side of the middle shield 1, the bottom of which is close to the front shield 2. The provision of the sealing retaining ring 22 enables the device to directly block larger common stones and mud blocks, further improving the sealing effect of the device.

[0040] like Figure 1 , Figure 2As shown, further, a method for using the sealing device comprises the following steps:

[0041] S1, initial installation of the sealing device, fixing the first ring sleeve 11, the second ring sleeve 13, the first movable ring 12 and the second movable ring 14 on the front shield 2 and the middle shield 1 according to the set positions;

[0042] S2, filling of sealing lubricating oil, starting the oil circuit, inputting the sealing lubricating oil into the cavity of the ring sleeve and the movable ring to fill the entire cavity;

[0043] S3, the operation of the sealing device, controlling the movable pressure block 17 to squeeze the sealing lubricating oil in the cavity upward, cooperating with the activity of the hinge mechanism to replenish the oil film between the ring sleeve and the movable ring in time, and at the same time increasing the pressure in the cavity by squeezing;

[0044] S4. Inspection and maintenance of the sealing device. With the long-term use of the device, the sealing lubricating oil in the cavity is continuously consumed. When it is detected that it needs to be replenished, the movable pressing block 17 is controlled to slide downward, and the oil circuit is started again to input the sealing lubricating oil into the cavity, filling the space in the cavity again, and completing the replacement of the sealing lubricating oil.

[0045] Working principle: When using this device, first perform the initial installation and debugging of the sealing device, and fix the first ring sleeve 11, the second ring sleeve 13, the first movable ring 12 and the second movable ring 14 on the front shield 2 and the middle shield 1 according to the set position. The ring sleeves and movable rings are combined in pairs, and the sealing rings 15 are installed inside; the installation height of the rubber seals on both sides of the front shield 2 is adjusted so that the top can be close to the upper middle shield 1 when the shield machine is in a straight state. Then control the movable pressure block 17 to drop to the lowest position, start the oil pump 4, extract the sealing lubricating oil stored in the oil tank 3, and input the sealing lubricating oil from the oil outlet 10 into the cavity through the oil pipe 8 to fill the entire cavity. At this time, the preparation work of the sealing device has been completed. During the operation of the shield machine and the articulated mechanism, the cylinder 16 is started so that its output end controls the movable pressure block 17 to apply pressure upward to squeeze the sealing lubricant in the cavity, and the consumed oil film is replenished between the ring sleeve and the movable ring in time in coordination with the activities of other moving mechanisms. At the same time, the pressure in the cavity is increased by squeezing to form a pressure sealing environment. With the long-term use of the device, the sealing lubricant in the cavity is continuously consumed, that is, the movable pressure block 17 maintains the pressure on the cavity and rises to the highest point. In this embodiment, a sensor is set in the cylinder 16. When it is detected that the output of the cylinder 16 is extended to the longest, it indicates that the sealing lubricant in the cavity needs to be replenished. Then the movable pressure block 17 is controlled to slide downward, and the oil pump 4 is started again to input the sealing lubricant into the cavity, and the space in the cavity is filled again to complete the replacement of the sealing lubricant.

[0046] During the above-mentioned whole process, the device is different from the movable seal of a single ring sleeve and a movable ring through the cooperation setting between the first ring sleeve 11 and the first movable ring 12, and the second ring sleeve 13 and the second movable ring 14. The segmented type not only shares the movable pressure of the supporting connection, but also forms a double-stage sealing effect, which can further improve the sealing effect of the device; at the same time, through the cooperation of the segmented ring sleeve and the movable ring, a cavity that can accommodate the sealing lubricating oil can be separated therein. During the operation of the shield machine and the articulated mechanism, the sealing oil film will be consumed and filled in time, without the need for regular replenishment or inspection at any time, thereby avoiding the reduction of the sealing effect and increasing the service life of the seal; through the cooperation of the ring sleeve and the cavity in the movable ring and the movable pressure block, the pneumatic seal can be replaced, and at the same time, the replenishment of the sealing lubricating oil is further facilitated, the operation is simplified, and time and effort are saved.

[0047] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0048] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A sealing device for a shield machine hinge mechanism, comprising a ring sleeve and a movable ring arranged between a front shield (2) and a middle shield (1), characterized in that: The connecting surface between the ring sleeve and the movable ring is an arc surface. The ring sleeve comprises a first ring sleeve (11) and a second ring sleeve (13) which are symmetrically arranged at intervals and connected to the middle shield (1). The movable ring comprises a first movable ring (12) and a second movable ring (14) which are respectively adapted to the first ring sleeve (11) and the second ring sleeve (13) and connected to the front shield (2). A cavity for accommodating sealing lubricating oil is formed in the ring sleeve and the movable ring. A movable pressing block (17) is installed at the bottom of the interval between the first movable ring (12) and the second movable ring (14) in the front shield (2) so as to slide up and down. An oil passage connected to the middle shield (1) is arranged at the top of the interval between the first ring sleeve (11) and the second ring sleeve (13) in the middle shield (1) so as to transport the sealing lubricating oil to the cavity.

2. A sealing device for a shield machine hinge mechanism according to claim 1, characterized in that: The oil circuit comprises an oil pipe (8) arranged in the middle shield (1), one end of the oil pipe (8) is connected to the oil tank (3) through an oil pump (4), and the other end of the oil pipe (8) extends to the cavity and is provided with an oil outlet (10).

3. A sealing device for a shield machine hinge mechanism according to claim 2, characterized in that: A one-way valve (9) is also provided in the oil pipe (8).

4. The sealing device for a shield machine hinge mechanism according to claim 1, characterized in that: A cylinder (16) is installed at the bottom of the movable pressing block (17) in the front shield (2), and the output end of the cylinder (16) is connected to the bottom of the movable pressing block (17).

5. The sealing device for a shield machine hinge mechanism according to claim 1, characterized in that: Installation grooves are arranged at intervals in the bottom arc surfaces of the first ring sleeve (11) and the second ring sleeve (13), and sealing rings (15) are arranged in the installation grooves and are respectively adapted to the first movable ring (12) and the second movable ring (14).

6. A sealing device for a shield machine hinge mechanism according to claim 1, characterized in that: A rubber seal (18) is installed on one side of the movable ring on the front shield (2), and the top of the rubber seal (18) is used to fit tightly with the middle shield (1).

7. A sealing device for a shield machine hinge mechanism according to claim 6, characterized in that: An emergency sealing airbag (19) is arranged at the bottom of the rubber seal (18), and the lower end of the emergency sealing airbag (19) is connected to a gas tank (21) via an air nozzle (20) communicating therewith, so as to inflate the emergency sealing airbag (19).

8. The sealing device for a shield machine hinge mechanism according to claim 1, characterized in that: A sealing baffle ring (22) is provided on one side of the front shield (2) and its top is closely attached to the middle shield (1); and a sealing baffle ring (22) is provided on one side of the middle shield (1) and its bottom is closely attached to the front shield (2).

9. A method for using the sealing device according to any one of claims 1 to 8, characterized in that: The steps include: S1, initial installation of the sealing device, fixing the first ring sleeve (11), the second ring sleeve (13), the first movable ring (12) and the second movable ring (14) on the front shield (2) and the middle shield (1) according to the set positions; S2, filling of sealing lubricating oil, starting the oil circuit, inputting the sealing lubricating oil into the cavity of the ring sleeve and the movable ring to fill the entire cavity; S3, the operation of the sealing device, controlling the movable pressure block (17) to squeeze the sealing lubricating oil in the cavity upward, cooperating with the movement of the hinge mechanism to replenish the oil film between the ring sleeve and the movable ring in time, and at the same time increasing the pressure in the cavity by squeezing; S4. Inspection and maintenance of the sealing device. With the long-term use of the device, the sealing lubricating oil in the cavity is continuously consumed. When it is detected that it needs to be replenished, the movable pressing block (17) is controlled to slide downward, and the oil circuit is started again to input the sealing lubricating oil into the cavity, so that the space in the cavity is filled again, and the replacement of the sealing lubricating oil is completed.

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