Shield sealing method

Abstract

According to the shield sealing method, a cylinder body, a piston rod, an outer sealing pipe sleeve and a sealing unit are included, the cylinder body is installed at the rear end of the outer sealing pipe sleeve, and the piston rod is installed at the front end of the cylinder body in a telescopic mode; the sealing unit comprises a first sealing piece and a second sealing piece. According to the sealing unit, through combination of the first sealing piece and the second sealing piece, the comprehensive performance is high, and the sealing performance of a shield is further improved; compared with a casting molding mode, the shield sealing method has the advantages that the operation process and processing conditions are simpler, and the shield sealing method is convenient to popularize and use.

Description

Technical Field

[0001] The invention relates to the technical field related to sealing molding, and in particular to a shield sealing method. Background Art

[0002] A shield machine is a tunnel boring machine that uses the shield method. The shield construction method is that the tunnel boring machine builds (lays) the "shield" (referring to the supporting segments) of the tunnel while excavating, which is different from the open construction method. Internationally, the broad shield machine can also be used in rock formations, but it is different from the open (non-shield method) tunnel boring machine. In my country, it is customary to call the tunnel boring machine used in soft soil formations a (narrow sense) shield machine, and the one used in rock formations a (narrow sense) TBM.

[0003] After massive searches, it was found that reference document 1 with Chinese patent publication number CN113290901A discloses a shield seal molding method, including step S1, initial cleaning of the mold; step S2, mold clamping and positioning; step S3, secondary cleaning of the mold; step S4, mold pouring preparation; step S5, mold preheating; step S6, pouring raw material preparation; step S7, pouring; step S8, curing and demolding; step S9, secondary continuous pouring; step S10, secondary vulcanization; step S11, polishing; step S12, quality inspection.

[0004] After massive searches, it was found that reference document 2 with Chinese patent publication number CN210118128U discloses a seal for a shield machine, which relates to the technical field of shield machines. The seal for a shield machine includes a cylinder body, a piston rod is installed inside the cylinder body, a flange is fixed to the outside of the cylinder body, and a sleeve is provided on the outside of the cylinder body near the piston rod, one end of the sleeve is fixedly connected to the flange by bolts, a first rubber ring is fixed inside the sleeve near the outside of the piston rod, and an airbag is installed on the inside of the sleeve near the first rubber ring.

[0005] In summary, the shield seal molding method of the existing reference document 1 is mainly a casting molding method, and the casting molding process is relatively complicated and the processing conditions are relatively harsh;

[0006] In the existing reference document 2, the seal for the shield machine is sealed by a single sealing ring, and the sealing effect is relatively general.

[0007] In view of the above-mentioned defects, the designers actively carried out research and innovation in order to create a shield sealing method to make it more valuable for industrial use. Summary of the invention

[0008] To solve any of the above technical problems, the present invention aims to provide a shield sealing method.

[0009] To achieve the above object, the present invention adopts the following technical solution:

[0010] A shield sealing method comprises a cylinder body, a piston rod, an outer sealing sleeve and a sealing unit, wherein the cylinder body is installed at the rear end of the outer sealing sleeve, and the piston rod is telescopically installed at the front end of the cylinder body;

[0011] The sealing unit includes a first sealing member and a second sealing member;

[0012] The first sealing member includes, from outside to inside, a first sealing outer lip body and a first sealing inner lip body, and an O-ring is installed between the first sealing outer lip body and the first sealing inner lip body;

[0013] The second sealing member comprises a second sealing outer lip body, and a plurality of second sealing inner lip bodies are evenly distributed in sequence from front to back on the inner side of the second sealing outer lip body;

[0014] The shield sealing method comprises the following steps in sequence:

[0015] Step S1, a sealing structure mounting seat is installed in the middle of the inner side of the outer sealing sleeve, a sealing structure mounting groove for mounting a sealing support frame is opened on the inner side of the sealing structure mounting seat, and the sealing support frame is installed in the outer sealing structure mounting groove;

[0016] Step S2, a first sealing groove is provided on both the front and rear sides of the inner side of the sealing support frame, a second sealing groove is provided in the middle part of the inner side of the sealing support frame, a first sealing member is installed in the first sealing groove, and a second sealing member is installed in the second sealing groove;

[0017] Step S3, installing a rear support ring at the inner rear end of the outer sealing sleeve, and installing a front support ring at the inner front end of the outer sealing sleeve;

[0018] Step S4, the cylinder body is installed at the rear end of the outer sealing sleeve through the outer fastening ring, and then the piston rod located at the front end of the cylinder body is installed through the outer sealing sleeve, so that the piston rod passes through the rear support ring, the sealing unit and the front support ring from back to front in sequence.

[0019] As a further improvement of the present invention, in step S3, a rear support pad is installed between the rear support ring and the inner piston rod, and a front support pad is installed between the front support ring and the inner piston rod.

[0020] As a further improvement of the present invention, guide ring grooves are provided on the inner sides of the sealing support frames at both sides of the front and rear of the second sealing groove, and guide rings are installed in the guide ring grooves.

[0021] As a further improvement of the present invention, the first sealing outer lip body is distributed along the front-to-back direction, and the inner side of the first sealing inner lip body is inclined toward the rear end side;

[0022] The first sealing outer lip body contacts the first sealing groove on the outside, and the first sealing inner lip body contacts the piston rod on the inside.

[0023] As a further improvement of the present invention, a V-shaped groove is provided at the rear end between the first sealing outer lip body and the first sealing inner lip body, and an O-ring is installed in the V-shaped groove.

[0024] As a further improvement of the present invention, O-rings are installed on the top and bottom of the rear end of the first sealing inner lip body.

[0025] As a further improvement of the present invention, the second sealing outer lip bodies are distributed along the front-to-back direction, and the inner sides of the plurality of second sealing inner lip bodies are inclined toward the rear end or the front end;

[0026] The second sealing outer lip body contacts the second sealing groove on the outer side, and the second sealing inner lip body contacts the piston rod on the inner side.

[0027] As a further improvement of the present invention, a square groove is provided between two adjacent second sealing inner lips.

[0028] As a further improvement of the present invention, O-rings are installed in the square groove, at the rear end of the rear second sealing inner lip body, and at the front end of the front second sealing inner lip body.

[0029] As a further improvement of the present invention, the inclination angle of the second sealing inner lip body is 30 to 60 degrees.

[0030] By means of the above scheme, the present invention has at least the following advantages:

[0031] The sealing unit of the present invention has strong comprehensive performance through the combination of the first sealing member and the second sealing member, and further improves the sealing performance of the shield;

[0032] Compared with the casting method, the shield sealing method of the present invention has simpler operation process and processing conditions, and is easy to promote and use;

[0033] The first seal of the present invention supports the rear end of the first seal through the O-ring in the V-shaped groove, and supports the front end of the first seal through the other two O-rings, so that the first seal can be well in contact with the inner piston rod, reducing the risk of falling off and increasing the service life;

[0034] The second seal of the present invention contacts the inner piston rod through multiple inner second sealing inner lips to perform multi-stage sealing processing, and the inclined structural setting of the second sealing inner lip can reduce the probability of damage to the second sealing inner lip and increase its service life.

[0035] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 It is a structural schematic diagram of a cylinder body, a piston rod and a sealing structure in a shield sealing method of the present invention;

[0038] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the first seal, the guide ring and the second seal;

[0039] Figure 3 yes Figure 1 A schematic structural diagram of the first sealing member;

[0040] Figure 4 yes Figure 1 A schematic diagram of the structure of the second sealing member;

[0041] Figure 5 It is a schematic diagram of the workflow of the present invention.

[0042] The meanings of the various reference numerals in the figures are as follows.

[0043] Cylinder body 1, piston rod 2, outer sealing sleeve 3, outer fastening ring 4, rear support ring 5, rear support pad 6, sealing structure mounting seat 7, sealing support frame 8, front support ring 9, front support pad 10, first sealing member 11, guide ring 12, second sealing member 13, first sealing groove 14, guide ring groove 15, second sealing groove 16, first sealing outer lip body 17, first sealing inner lip body 18, O-ring 19, second sealing outer lip body 20, second sealing inner lip body 21. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. The components of the embodiment of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiment of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0046] Example

[0047] like Figure 1 to Figure 5 As shown,

[0048] A shield sealing method comprises a cylinder body 1, a piston rod 2, an outer sealing sleeve 3 and a sealing unit, wherein the cylinder body 1 is installed at the rear end of the outer sealing sleeve 3, and the piston rod 2 is telescopically installed at the front end of the cylinder body 1.

[0049] The sealing unit includes a first sealing member 11 and a second sealing member 13 .

[0050] The first sealing member 11 includes a first sealing outer lip body 17 and a first sealing inner lip body 18 in sequence from the outside to the inside, and an O-ring 19 is installed between the first sealing outer lip body 17 and the first sealing inner lip body 18 .

[0051] Guide ring grooves 15 are provided on the inner side of the seal support frame 8 at both the front and rear sides of the second seal groove 16 , and guide rings 12 are installed in the guide ring grooves 15 .

[0052] The first sealing outer lip body 17 is distributed along the front-to-back direction, and the inner side of the first sealing inner lip body 18 is inclined toward the rear end;

[0053] The first sealing outer lip 17 contacts the first sealing groove 14 on the outside, and the first sealing inner lip 18 contacts the piston rod 2 on the inside.

[0054] A V-shaped groove is provided at the rear end between the first sealing outer lip 17 and the first sealing inner lip 18 , and an O-ring 19 is installed in the V-shaped groove.

[0055] O-rings 19 are installed at the top and bottom of the rear end of the first sealing inner lip body 18 .

[0056] The second sealing member 13 comprises a second sealing outer lip body 20 , and a plurality of second sealing inner lip bodies 21 are evenly distributed in sequence from front to back on the inner side of the second sealing outer lip body 20 .

[0057] The second sealing outer lips 20 are distributed along the front-to-back direction, and the inner sides of the plurality of second sealing inner lips 21 are inclined toward the rear end or the front end.

[0058] The second sealing outer lip 20 contacts the outer second sealing groove 16 , and the second sealing inner lip 21 contacts the inner piston rod 2 .

[0059] A square groove is provided between two adjacent second sealing inner lips 21 .

[0060] O-rings 19 are installed in the square groove, at the rear end of the rear second sealing inner lip body 21 and at the front end of the front second sealing inner lip body 21 .

[0061] The inclination angle of the second sealing inner lip body 21 is 30 to 60 degrees.

[0062] The shield sealing method comprises the following steps in sequence:

[0063] Step S1, a sealing structure mounting seat 7 is installed in the middle of the inner side of the outer sealing sleeve 3, a sealing structure mounting groove for mounting a sealing support frame 8 is opened on the inner side of the sealing structure mounting seat 7, and the sealing support frame 8 is installed in the outer sealing structure mounting groove.

[0064] Step S2, a first sealing groove 14 is provided on both the front and rear sides of the inner side of the sealing support frame 8, a second sealing groove 16 is provided in the middle of the inner side of the sealing support frame 8, the first sealing member 11 is installed in the first sealing groove 14, and the second sealing member 13 is installed in the second sealing groove 16.

[0065] Step S3, install the rear support ring 5 at the inner rear end of the outer sealing sleeve 3, and install the front support ring 9 at the inner front end of the outer sealing sleeve 3. In step S3, the rear support pad 6 is installed between the rear support ring 5 and the inner piston rod 2, and the front support pad 10 is installed between the front support ring 9 and the inner piston rod 2.

[0066] Step S4, the cylinder body 1 is installed at the rear end of the outer sealing sleeve 3 through the outer fastening ring 4, and then the piston rod 2 located at the front end of the cylinder body 1 is installed through the outer sealing sleeve 3, so that the piston rod 2 passes through the rear support ring 5, the sealing unit and the front support ring 9 from back to front in sequence.

[0067] The first embodiment of the present invention:

[0068] The shield sealing structure includes a cylinder body 1, a piston rod 2, an outer sealing sleeve 3 and a sealing unit. The cylinder body 1 is installed at the rear end of the outer sealing sleeve 3, and the piston rod 2 is telescopically installed at the front end of the cylinder body 1. The sealing unit includes a first sealing member 11 and a second sealing member 13. The first sealing members 11 at the front and rear sides are adapted to each other, the two guide rings 12 at the front and rear sides are adapted to each other, and a second sealing member 13 in the middle part performs sealing treatment on the middle part.

[0069] 1. The first sealing member 11 includes a first sealing outer lip body 17 and a first sealing inner lip body 18 from the outside to the inside, and an O-ring 19 is installed between the first sealing outer lip body 17 and the first sealing inner lip body 18.

[0070] 1. The first sealing outer lip 17 is arranged along the front-to-back direction, and the inner side of the first sealing inner lip 18 is inclined toward the rear end;

[0071] The first sealing outer lip 17 contacts the first sealing groove 14 on the outside, and the first sealing inner lip 18 contacts the piston rod 2 on the inside.

[0072] 2. A V-shaped groove is provided at the rear end between the first sealing outer lip 17 and the first sealing inner lip 18, and an O-ring 19 is installed in the V-shaped groove.

[0073] 3. O-rings 19 are installed at the top and bottom of the rear end of the first sealing inner lip body 18.

[0074] The first seal supports the rear end of the first seal through the O-ring in the V-groove, and supports the front end of the first seal through the other two O-rings, so that the first seal can be in good contact with the inner piston rod, reducing the risk of falling off and increasing the service life.

[0075] 2. Guide ring grooves 15 are provided on the inner side of the sealing support frame 8 at both sides of the front and rear of the second sealing groove 16 , and guide rings 12 are installed in the guide ring grooves 15 .

[0076] 3. The second sealing member 13 comprises a second sealing outer lip body 20 , and a plurality of second sealing inner lip bodies 21 are evenly distributed in sequence from front to back on the inner side of the second sealing outer lip body 20 .

[0077] 1. The second sealing outer lip bodies 20 are distributed along the front-to-back direction, and the inner sides of the plurality of second sealing inner lip bodies 21 are inclined toward the rear end or the front end;

[0078] The second sealing outer lip 20 contacts the outer second sealing groove 16 , and the second sealing inner lip 21 contacts the inner piston rod 2 .

[0079] 2. A square groove is provided between two adjacent second sealing inner lips 21. In addition, the square groove can also be transformed into a groove body with a similar structure such as a V-shaped groove or a U-shaped groove according to actual conditions. Through the square groove, a certain interval is designed between two adjacent second sealing inner lips 21, so that each second sealing inner lip 21 can play a role of independent sealing without affecting each other. In addition, through the structural setting of multiple uniformly distributed second sealing inner lips 21, when one of the second sealing inner lips 21 is damaged, the other second sealing inner lips 21 can still work normally, ensuring that the sealing function will not fail immediately, thereby extending the service life of the sealing structure.

[0080] 3. O-rings 19 are installed in the square groove, at the rear end of the rear second sealing inner lip body 21, and at the front end of the front second sealing inner lip body 21. The O-rings 19 can provide certain support to the front and rear sides of the plurality of second sealing inner lips 21, thereby reducing the probability of sealing failure of the second sealing inner lips 21, and thus extending the service life of the sealing structure.

[0081] 4. The inclination angle of the second sealing inner lip 21 is 30 to 60 degrees.

[0082] The second embodiment of the present invention:

[0083] The shield sealing method comprises the following steps in sequence:

[0084] Step S1, a sealing structure mounting seat 7 is installed in the middle of the inner side of the outer sealing sleeve 3, a sealing structure mounting groove for mounting a sealing support frame 8 is opened on the inner side of the sealing structure mounting seat 7, and the sealing support frame 8 is installed in the outer sealing structure mounting groove.

[0085] When the sealing support frame 8 is embedded in the sealing structure installation groove, the sealing support frame 8 can be locked in the sealing structure installation groove by a locking mechanism such as bolts.

[0086] Step S2, a first sealing groove 14 is provided on both the front and rear sides of the inner side of the sealing support frame 8, a second sealing groove 16 is provided in the middle of the inner side of the sealing support frame 8, the first sealing member 11 is installed in the first sealing groove 14, and the second sealing member 13 is installed in the second sealing groove 16.

[0087] The steps of forming the first sealing member 11 and the second sealing member 13 in step S2 may also be placed before step S1.

[0088] During the installation of the first sealing member 1 , the first sealing outer lip 17 contacts the first sealing groove 14 on the outside, and the first sealing inner lip 18 contacts the piston rod 2 on the inside.

[0089] During the installation of the second sealing member 13 , the second sealing outer lip 20 contacts the outer second sealing groove 16 , and the second sealing inner lip 21 contacts the inner piston rod 2 .

[0090] Step S3, install the rear support ring 5 at the inner rear end of the outer sealing sleeve 3, and install the front support ring 9 at the inner front end of the outer sealing sleeve 3. The rear support ring 5 and the front support ring 9 can be used to perform external support on the inner piston rod to avoid the piston rod from having too long a stroke, thereby causing the piston rod to deviate or have insufficient pressure bearing capacity.

[0091] Step S4, the cylinder body 1 is installed at the rear end of the outer sealing sleeve 3 through the outer fastening ring 4, and then the piston rod 2 located at the front end of the cylinder body 1 is installed through the outer sealing sleeve 3, so that the piston rod 2 passes through the rear support ring 5, the sealing unit and the front support ring 9 from back to front in sequence.

[0092] Among them, in step S3, a rear support pad 6 is installed between the rear support ring 5 and the inner piston rod 2, and a front support pad 10 is installed between the front support ring 9 and the inner piston rod 2. The rear support pad 6 and the front support pad 10 are both rubber pads with a certain elasticity, etc., which can buffer the rear support ring 5 and the front support ring 9 respectively, so as to prevent the support rings from directly contacting the inner piston rod, thereby causing damage to the outer surface of the inner piston rod.

[0093] In step S3, a guide ring 12 is installed in the guide ring groove 15 to guide the inner piston rod during its movement.

[0094] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0095] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A shield sealing method, comprising a cylinder body (1), a piston rod (2), an outer sealing sleeve (3) and a sealing unit, wherein the cylinder body (1) is installed at the rear end of the outer sealing sleeve (3), and the piston rod (2) is telescopically installed at the front end of the cylinder body (1); Features: The sealing unit comprises a first sealing member (11) and a second sealing member (13); The first sealing member (11) comprises, from outside to inside, a first sealing outer lip body (17) and a first sealing inner lip body (18), and an O-ring (19) is installed between the first sealing outer lip body (17) and the first sealing inner lip body (18); The second sealing member (13) comprises a second sealing outer lip body (20), and a plurality of second sealing inner lip bodies (21) are evenly distributed in sequence from front to back on the inner side of the second sealing outer lip body (20); The shield sealing method comprises the following steps in sequence: Step S1, a sealing structure mounting seat (7) is installed in the middle of the inner side of the outer sealing sleeve (3), a sealing structure mounting groove for mounting a sealing support frame (8) is opened on the inner side of the sealing structure mounting seat (7), and the sealing support frame (8) is installed in the outer sealing structure mounting groove; Step S2, a first sealing groove (14) is provided on both the front and rear sides of the inner side of the sealing support frame (8), a second sealing groove (16) is provided in the middle part of the inner side of the sealing support frame (8), the first sealing member (11) is installed in the first sealing groove (14), and the second sealing member (13) is installed in the second sealing groove (16); Step S3, installing a rear support ring (5) at the inner rear end of the outer sealing sleeve (3), and installing a front support ring (9) at the inner front end of the outer sealing sleeve (3); Step S4, the cylinder body (1) is installed at the rear end of the outer sealing sleeve (3) through the outer fastening ring (4), and then the piston rod (2) located at the front end of the cylinder body (1) is installed and passed through the outer sealing sleeve (3), so that the piston rod (2) passes through the rear support ring (5), the sealing unit and the front support ring (9) in sequence from back to front.

2. A shield sealing method as claimed in claim 1, characterized in that: In step S3, a rear support pad (6) is installed between the rear support ring (5) and the inner piston rod (2), and a front support pad (10) is installed between the front support ring (9) and the inner piston rod (2).

3. A shield sealing method as claimed in claim 1, characterized in that: Guide ring grooves (15) are provided on the inner side of the sealing support frame (8) at both the front and rear sides of the second sealing groove (16), and a guide ring (12) is installed in the guide ring groove (15).

4. A shield sealing method as claimed in claim 1, characterized in that: The first sealing outer lip body (17) is distributed along the front-to-back direction, and the inner side of the first sealing inner lip body (18) is inclined toward the rear end; The first sealing outer lip (17) is in contact with the first sealing groove (14) on the outside, and the first sealing inner lip (18) is in contact with the piston rod (2) on the inside.

5. A shield sealing method as claimed in claim 4, characterized in that: A V-shaped groove is provided at the rear end between the first sealing outer lip body (17) and the first sealing inner lip body (18), and an O-ring (19) is installed in the V-shaped groove.

6. A shield sealing method as claimed in claim 4, characterized in that: O-rings (19) are installed on the top and bottom of the rear end of the first sealing inner lip body (18).

7. A shield sealing method as claimed in claim 1, characterized in that: The second sealing outer lip bodies (20) are distributed along the front-to-back direction, and the inner sides of a plurality of the second sealing inner lip bodies (21) are inclined toward the rear end or the front end; The second sealing outer lip (20) contacts the second sealing groove (16) on the outside, and the second sealing inner lip (21) contacts the piston rod (2) on the inside.

8. A shield sealing method as claimed in claim 7, characterized in that: A square groove is provided between two adjacent second sealing inner lips (21).

9. A shield sealing method as claimed in claim 8, characterized in that: O-rings (19) are installed in the square groove, at the rear end of the rear second sealing inner lip body (21) and at the front end of the front second sealing inner lip body (21).

10. A shield sealing method as claimed in claim 7, characterized in that: The inclination angle of the second sealing inner lip body (21) is 30 to 60 degrees.

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