Combined sealing structure and sealing installation method

Abstract

The invention relates to a combined sealing structure and a sealing installation method.The combined sealing structure comprises a cylinder body, a piston rod, an outer sealing pipe sleeve and a sealing unit, 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 structure, a second sealing structure and a third sealing structure. Through the combination of the first sealing structure, the second sealing structure and the third sealing structure, the comprehensive performance is high, and the sealing performance of the shield is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to sealing molding, and in particular to a combined sealing structure and a sealing installation 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 seals used in the shield machine are sealed by a single sealing ring, and the sealing effect is relatively general.

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

[0008] In order to solve any of the above technical problems, the object of the present invention is to provide a combined sealing structure and a sealing installation method.

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

[0010] One of the purposes of the present invention:

[0011] A combined sealing structure 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;

[0012] The sealing unit includes a first sealing structure, a second sealing structure and a third sealing structure;

[0013] The first sealing structure includes a first sealing outer lip body and a first sealing inner lip body in sequence from the outside to the inside. A plurality of first sealing inner lip bodies are evenly distributed along the front-to-back direction on the inner side of the first sealing outer lip body, and the plurality of first sealing inner lip bodies are all tilted toward the front end or the rear end. A first sealing support end is provided at the top and the bottom of the first sealing outer lip body, and a first sealing O-ring is installed between the first sealing support end and the inner first sealing inner lip body.

[0014] The second sealing structure includes a second sealing body, which includes a second sealing outer lip body and a second sealing inner lip body in sequence from outside to inside at the front end or the rear end of the second sealing body, the second sealing outer lip body is inclined toward the outside, the second sealing inner lip body is inclined toward the inside, a second sealing outer lip body protrusion is arranged on the inside of the second sealing outer lip body, a second sealing inner lip body protrusion matched with the second sealing outer lip body protrusion is arranged on the outside of the second sealing inner lip body, and the second sealing outer lip body protrusion is in contact with the second sealing inner lip body protrusion;

[0015] The third sealing structure includes a third sealing inner lip body and a third sealing outer lip body from the inside to the outside, the third sealing outer lip body is inclined toward the outside, and a second sealing O-ring is installed between the third sealing inner lip body and the third sealing outer lip body;

[0016] A guide ring is arranged between the first sealing structure and the second sealing structure, and between the second sealing structure and the third sealing structure.

[0017] As a further improvement of the present invention, a lubrication unit is installed in the cylinder body at the front end of the sealing unit, and the lubrication unit includes an injection groove, an injection channel and impregnating cotton from the outside to the inside. The injection groove is installed on the outer sealing sleeve, and an injection channel extending into the cylinder body is installed on the inner side of the injection groove, and impregnating cotton is installed on the inner side of the injection channel.

[0018] As a further improvement of the present invention, a plug is installed on the outer side of the injection groove, and the injection channel is installed in the cylinder body through a clamping ring.

[0019] As a further improvement of the present invention, support rings are installed at the front end and the rear end of the inner side of the outer sealing sleeve.

[0020] As a further improvement of the present invention, the sealing unit also includes a sealing structure mounting seat and a sealing support frame. The sealing structure mounting seat is installed in the middle part of the inner side of the outer sealing sleeve. A sealing structure mounting groove for installing the sealing support frame is opened on the inner side of the sealing structure mounting seat. The sealing support frame is installed in the outer sealing structure mounting groove. A first sealing groove for installing a first sealing structure, a guide groove for installing a guide ring, a second sealing groove for installing a second sealing structure, and a third sealing groove for installing a third sealing structure are opened on the inner side of the sealing support frame.

[0021] As a further improvement of the present invention, a first sealing inner core is installed on the inner side of the first sealing outer lip body, and a first sealing outer lip body raised contact end is arranged on the outer side of the top and bottom of the first sealing outer lip body, and a first sealing inner lip body raised contact end is arranged on the inner side of the top or bottom of the first sealing inner lip body, and both the first sealing outer lip body raised contact end and the first sealing inner lip body raised contact end are serrated raised structures.

[0022] As a further improvement of the present invention, a second sealing inner lip body raised contact end is provided on the inner side of the second sealing body, and the second sealing inner lip body raised contact end is a sawtooth-shaped raised structure.

[0023] As a further improvement of the present invention, a third sealing groove is opened on the top or bottom side of the third sealing inner lip body, a third sealing friction block is installed in the third sealing groove, and a third sealing inner lip body raised contact end is arranged on the inner side of the third sealing inner lip body, and the third sealing inner lip body raised contact end is a serrated raised structure.

[0024] As a further improvement of the present invention, a third sealing O-ring is installed on the outer top of the third sealing outer lip body, and a fourth sealing O-ring is installed on the outer bottom of the third sealing outer lip body.

[0025] The second purpose of the present invention is:

[0026] A combined seal installation method comprises the following steps in sequence:

[0027] 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;

[0028] Step S2, a first sealing groove is formed at the rear end of the inner side of the sealing support frame, a second sealing groove is formed at the middle part of the inner side of the sealing support frame, a third sealing groove is formed at the front end of the inner side of the sealing support frame, a guide groove is formed between the first sealing groove and the second sealing groove, and between the second sealing groove and the third sealing groove, the first sealing structure is installed in the first sealing groove, the guide ring is installed in the guide groove, the second sealing structure is installed in the second sealing groove, and the third sealing structure is installed in the third sealing groove;

[0029] Step S3, supporting rings are installed at the front end and the rear end of the inner side of the outer sealing sleeve;

[0030] 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 end support ring, the sealing unit and the front end support ring from back to front in sequence.

[0031] By means of the above scheme, the present invention has at least the following advantages:

[0032] The present invention has a strong comprehensive performance through the combination of the first sealing structure, the second sealing structure and the third sealing structure, and further improves the sealing performance of the shield.

[0033] The present invention can inject lubricating oil into the surface of the piston rod in the cylinder body through the structural setting of the lubrication unit, thereby maintaining the piston rod, making the connection between the piston rod and the cylinder body more lubricated and reducing friction.

[0034] 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.

[0035] The first sealing structure of the present invention performs multi-stage sealing processing by contacting the inner piston rod with multiple inner second sealing inner lips, and the inclined structural setting of the second sealing inner lips can reduce the probability of damage to the second sealing inner lips and increase the service life.

[0036] The second sealing structure of the present invention can improve the structural strength between the second sealing outer lip body and the second sealing inner lip body by means of the second sealing outer lip body protrusion and the second sealing inner lip body protrusion contacting each other between the second sealing outer lip body and the second sealing inner lip body.

[0037] The third sealing structure of the present invention supports the sealing lip body through the O-ring between the third sealing inner lip body and the third sealing outer lip body, and then the two O-rings on the third sealing outer lip body can make good contact with the sealing groove on one side, thereby reducing the risk of falling off and increasing the service life.

[0038] 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

[0039] 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.

[0040] Figure 1 It is a structural schematic diagram of a combined sealing structure of the present invention;

[0041] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the first sealing structure, the guide ring, the second sealing structure and the third sealing structure;

[0042] Figure 3 yes Figure 1 A schematic structural diagram of the first sealing structure;

[0043] Figure 4 yes Figure 1 A schematic structural diagram of the second sealing structure;

[0044] Figure 5 yes Figure 1 A schematic diagram of the structure of the third sealing structure;

[0045] Figure 6 It is a schematic diagram of the working process of a combined sealing installation method of the present invention.

[0046] The meanings of the various reference numerals in the figures are as follows.

[0047] Cylinder body 1, piston rod 2, outer sealing sleeve 3, support ring 4, injection groove 5, plug 6, clamping ring 7, injection channel 8, impregnated cotton 9, sealing structure mounting seat 10, sealing support frame 11, first sealing structure 12, guide ring 13, second sealing structure 14, third sealing structure 15, first sealing groove 16, guide groove 17, second sealing groove 18, third sealing groove 19;

[0048] A first sealing outer lip 20, a first sealing inner core 21, a first sealing inner lip 22, a first sealing support end 23, a first sealing O-ring 24, a first sealing outer lip raised contact end 25, and a first sealing inner lip raised contact end 26;

[0049] A second sealing body 27, a second sealing outer lip 28, a second sealing inner lip 29, a second sealing outer lip protrusion 30, a second sealing inner lip protrusion 31, and a second sealing inner lip protrusion contact end 32;

[0050] The third sealing inner lip 33 , the third sealing outer lip 34 , the second sealing O-ring 35 , the third sealing groove 36 , the third sealing friction block 37 , the third sealing O-ring 38 , the fourth sealing O-ring 39 , and the raised contact end 40 of the third sealing inner lip. DETAILED DESCRIPTION

[0051] 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.

[0052] 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 invention claimed for protection, 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.

[0053] Example

[0054] like Figure 1 to Figure 6 As shown,

[0055] A combined sealing structure 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;

[0056] The sealing unit includes a first sealing structure 12, a second sealing structure 14 and a third sealing structure 15;

[0057] The first sealing structure 12 includes a first sealing outer lip body 20 and a first sealing inner lip body 22 from the outside to the inside. A plurality of first sealing inner lip bodies 22 are evenly distributed along the front-to-back direction on the inner side of the first sealing outer lip body 20, and the plurality of first sealing inner lip bodies 22 are all tilted toward the front end or the rear end. A first sealing support end 23 is provided at the top and the bottom of the first sealing outer lip body 20, and a first sealing O-ring 24 is installed between the first sealing support end 23 and the inner first sealing inner lip body 22.

[0058] The second sealing structure 14 includes a second sealing body 27, which includes a second sealing outer lip 28 and a second sealing inner lip 29 in sequence from outside to inside at the front end or rear end of the second sealing body 27, the second sealing outer lip 28 is inclined toward the outside, the second sealing inner lip 29 is inclined toward the inside, a second sealing outer lip protrusion 30 is arranged on the inner side of the second sealing outer lip 28, a second sealing inner lip protrusion 31 matched with the second sealing outer lip protrusion 30 is arranged on the outer side of the second sealing inner lip 29, and the second sealing outer lip protrusion 30 is in contact with the second sealing inner lip protrusion 31;

[0059] The third sealing structure 15 includes a third sealing inner lip body 33 and a third sealing outer lip body 34 from the inside to the outside. The third sealing outer lip body 34 is inclined toward the outside. A second sealing O-ring 35 is installed between the third sealing inner lip body 33 and the third sealing outer lip body 34.

[0060] A guide ring 13 is provided between the first sealing structure 12 and the second sealing structure 14 , and between the second sealing structure 14 and the third sealing structure 15 .

[0061] Preferably, a lubrication unit is installed in the cylinder body 1 at the front end of the sealing unit, and the lubrication unit includes an injection groove 5, an injection channel 8 and impregnated cotton 9 from the outside to the inside. The injection groove 5 is installed on the outer sealing sleeve 3, and the injection channel 8 extending into the cylinder body 1 is installed on the inner side of the injection groove 5, and the impregnated cotton 9 is installed on the inner side of the injection channel 8.

[0062] Preferably, a plug 6 is installed on the outer side of the injection groove 5 , and the injection channel 8 is installed in the cylinder body 1 through a clamping ring 7 .

[0063] Preferably, support rings 4 are installed at both the front end and the rear end of the inner side of the outer sealing sleeve 3 .

[0064] Preferably, the sealing unit also includes a sealing structure mounting seat 10 and a sealing support frame 11. The sealing structure mounting seat 10 is installed in the middle part of the inner side of the outer sealing sleeve 3. A sealing structure mounting groove for installing the sealing support frame 11 is opened on the inner side of the sealing structure mounting seat 10. The sealing support frame 11 is installed in the outer sealing structure mounting groove. A first sealing groove 16 for installing the first sealing structure 12, a guide groove 17 for installing the guide ring 13, a second sealing groove 18 for installing the second sealing structure 14, and a third sealing groove 19 for installing the third sealing structure 15 are opened on the inner side of the sealing support frame 11.

[0065] Preferably, a first sealing inner core 21 is installed on the inner side of the first sealing outer lip body 20, a first sealing outer lip body raised contact end 25 is provided on the outer side of the top and bottom of the first sealing outer lip body 20, and a first sealing inner lip body raised contact end 26 is provided on the inner side of the top or bottom of the first sealing inner lip body 22, and both the first sealing outer lip body raised contact end 25 and the first sealing inner lip body raised contact end 26 are serrated raised structures.

[0066] Preferably, a second sealing inner lip body raised contact end 32 is provided on the inner side of the second sealing body 27 , and the second sealing inner lip body raised contact end 32 is a sawtooth-shaped raised structure.

[0067] Preferably, a third sealing groove 36 is opened on the top or bottom side of the third sealing inner lip body 33, a third sealing friction block 37 is installed in the third sealing groove 36, and a third sealing inner lip body raised contact end 40 is arranged on the inner side of the third sealing inner lip body 33, and the third sealing inner lip body raised contact end 40 is a serrated raised structure.

[0068] Preferably, a third sealing O-ring 38 is installed on the outer top of the third sealing outer lip body 34 , and a fourth sealing O-ring 39 is installed on the outer bottom of the third sealing outer lip body 34 .

[0069] A combined seal installation method comprises the following steps in sequence:

[0070] Step S1, a sealing structure mounting seat 10 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 11 is opened on the inner side of the sealing structure mounting seat 10, and the sealing support frame 11 is installed in the outer sealing structure mounting groove;

[0071] Step S2, a first sealing groove 16 is formed at the rear end of the inner side of the sealing support frame 11, a second sealing groove 18 is formed at the middle part of the inner side of the sealing support frame 11, a third sealing groove 19 is formed at the front end of the inner side of the sealing support frame 11, a guide groove 17 is formed between the first sealing groove 16 and the second sealing groove 18 and between the second sealing groove 18 and the third sealing groove 19, the first sealing structure 12 is installed in the first sealing groove 16, the guide ring 13 is installed in the guide groove 17, the second sealing structure 14 is installed in the second sealing groove 18, and the third sealing structure 15 is installed in the third sealing groove 19;

[0072] Step S3, supporting rings 5 ​​are installed at the front and rear ends of the inner sides of the outer sealing sleeve 3;

[0073] Step S4, the cylinder body 1 is installed at the rear end of the outer sealing sleeve 3 through the outer fastening ring, 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 end support ring 5, the sealing unit and the front end support ring 5 in sequence from back to front.

[0074] The first embodiment of the present invention:

[0075] A combined sealing structure comprises 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.

[0076] 1. The sealing unit comprises a first sealing structure 12, a second sealing structure 14 and a third sealing structure 15. The three sealing structures are adapted to each other, and the two front and rear guide rings 4 are adapted to each other.

[0077] 1) The first sealing structure 12 includes a first sealing outer lip body 20 and a first sealing inner lip body 22 from the outside to the inside. A plurality of first sealing inner lip bodies 22 are evenly distributed along the front-to-back direction on the inner side of the first sealing outer lip body 20, and the plurality of first sealing inner lip bodies 22 are all inclined toward the front end or the rear end. A first sealing support end 23 is provided at the top and bottom of the first sealing outer lip body 20, and a first sealing O-ring 24 is installed between the first sealing support end 23 and the inner first sealing inner lip body 22.

[0078] A first sealing inner core 21 is installed on the inner side of the first sealing outer lip body 20, and a first sealing outer lip body raised contact end 25 is provided on the outer side of the top and bottom of the first sealing outer lip body 20, and a first sealing inner lip body raised contact end 26 is provided on the inner side of the top or bottom of the first sealing inner lip body 22. Both the first sealing outer lip body raised contact end 25 and the first sealing inner lip body raised contact end 26 are serrated raised structures, which can increase the friction between the raised contact end and the sealing end surface to prevent falling off.

[0079] The multiple second sealing inner lips on the inner side are in contact with the inner piston rod to perform multi-stage sealing processing, and the inclined structural setting of the second sealing inner lips can reduce the probability of damage to the second sealing inner lips and increase the service life.

[0080] 2) The second sealing structure 14 includes a second sealing body 27, which includes a second sealing outer lip body 28 and a second sealing inner lip body 29 in sequence from the outside to the inside at the front end or the rear end of the second sealing body 27. The second sealing outer lip body 28 is inclined toward the outside, and the second sealing inner lip body 29 is inclined toward the inside. A second sealing outer lip body protrusion 30 is arranged on the inner side of the second sealing outer lip body 28, and a second sealing inner lip body protrusion 31 matched with the above-mentioned second sealing outer lip body protrusion 30 is arranged on the outer side of the second sealing inner lip body 29. The second sealing outer lip body protrusion 30 is in contact with the second sealing inner lip body protrusion 31.

[0081] A second sealing inner lip raised contact end 32 is provided on the inner side of the second sealing body 27. The second sealing inner lip raised contact end 32 is a sawtooth raised structure, which can increase the friction between the raised contact end and the sealing end surface to prevent falling off.

[0082] 3) The third sealing structure 15 includes a third sealing inner lip 33 and a third sealing outer lip 34 from the inside to the outside. The third sealing outer lip 34 is inclined toward the outside, and a second sealing O-ring 35 is installed between the third sealing inner lip 33 and the third sealing outer lip 34.

[0083] A third sealing groove 36 is opened on one side of the top or bottom of the third sealing inner lip body 33, and a third sealing friction block 37 is installed in the third sealing groove 36. A third sealing inner lip body raised contact end 40 is arranged on the inner side of the third sealing inner lip body 33. The third sealing inner lip body raised contact end 40 is a serrated raised structure, which can increase the friction between the raised contact end and the sealing end face to prevent falling off.

[0084] A third sealing O-ring 38 is installed on the outer top of the third sealing outer lip body 34 , and a fourth sealing O-ring 39 is installed on the outer bottom of the third sealing outer lip body 34 .

[0085] 2. A guide ring 13 is provided between the first sealing structure 12 and the second sealing structure 14, and between the second sealing structure 14 and the third sealing structure 15. The guide ring 13 is installed in the guide ring groove 17 to guide the inner piston rod during its movement.

[0086] 3. A lubrication unit is installed in the cylinder body 1 at the front end of the sealing unit. The lubrication unit includes an injection groove 5, an injection channel 8 and impregnated cotton 9 from the outside to the inside. The injection groove 5 is installed on the outer sealing sleeve 3. An injection channel 8 extending into the cylinder body 1 is installed on the inner side of the injection groove 5. Impregnated cotton 9 is installed on the inner side of the injection channel 8. A plug 6 is installed on the outer side of the injection groove 5. The injection channel 8 is installed in the cylinder body 1 through a clamping ring 7. The clamping ring 7 is installed on the outer sealing sleeve 3 in the cylinder body 1. The injection channel 8 is installed in the clamping ring 7. Impregnated cotton 9 is installed on the inner side of the injection channel 8. The impregnated cotton 9 is in contact with the inner piston rod.

[0087] Open the plug 6 and inject lubricating oil into the injection groove 5. The lubricating oil flows along the lubricating oil injection channel 8 to the impregnated cotton 9, so that the impregnated cotton 9 is accompanied by lubricating oil. During the extension and retraction of the piston rod, the lubricating oil on the impregnated cotton 9 is coated on the piston rod body, which reduces the friction during the extension and retraction process and improves the maintenance effect on the entire drive cylinder.

[0088] 4. Support rings 4 are installed at the front end and the rear end of the inner side of the outer sealing sleeve 3. In addition, support pads are installed between the support ring 4 and the inner piston rod. The support pads are rubber pads with a certain elasticity, etc., which can buffer the support ring 4 respectively to prevent the support ring from directly contacting the inner piston rod and causing damage to the outer surface of the inner piston rod.

[0089] 5. The sealing unit also includes a sealing structure mounting seat 10 and a sealing support frame 11. The sealing structure mounting seat 10 is installed in the middle of the inner side of the outer sealing sleeve 3. A sealing structure mounting groove for installing the sealing support frame 11 is opened on the inner side of the sealing structure mounting seat 10. The sealing support frame 11 is installed in the outer sealing structure mounting groove. A first sealing groove 16 for installing the first sealing structure 12, a guide groove 17 for installing the guide ring 13, a second sealing groove 18 for installing the second sealing structure 14, and a third sealing groove 19 for installing the third sealing structure 15 are opened on the inner side of the sealing support frame 11.

[0090] Through the installation structure of the sealing structure mounting seat 10 and the sealing support frame 11, as well as the sealing structure mounting groove for installing the sealing support frame 11, the installation and disassembly of the overall sealing unit and multiple sealing structures are more convenient, which is convenient for overall and individual use.

[0091] The second embodiment of the present invention:

[0092] A combined seal installation method comprises the following steps in sequence:

[0093] Step S1, a sealing structure mounting seat 10 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 11 is opened on the inner side of the sealing structure mounting seat 10, and the sealing support frame 11 is installed in the outer sealing structure mounting groove. After the sealing support frame is embedded in the sealing structure mounting groove, the sealing support frame can be locked in the sealing structure mounting groove by a locking mechanism such as bolts.

[0094] Step S2, a first sealing groove 16 is provided at the rear end of the inner side of the sealing support frame 11, a second sealing groove 18 is provided at the middle part of the inner side of the sealing support frame 11, a third sealing groove 19 is provided at the front end of the inner side of the sealing support frame 11, a guide groove 17 is provided between the first sealing groove 16 and the second sealing groove 18, and between the second sealing groove 18 and the third sealing groove 19, the first sealing structure 12 is installed in the first sealing groove 16, the guide ring 13 is installed in the guide groove 17, the second sealing structure 14 is installed in the second sealing groove 18, and the third sealing structure 15 is installed in the third sealing groove 19. The installation of the sealing structure in this step can also be placed before step S1 depending on the specific situation.

[0095] Step S3, support rings 5 ​​are installed at the front and rear ends of the inner side of the outer sealing sleeve 3. The support rings 5 ​​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.

[0096] Step S4, the cylinder body 1 is installed at the rear end of the outer sealing sleeve 3 through the outer fastening ring, 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 end support ring 5, the sealing unit and the front end support ring 5 in sequence from back to front.

[0097] The present invention has a strong comprehensive performance through the combination of the first sealing structure, the second sealing structure and the third sealing structure, and further improves the sealing performance of the shield.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 combined sealing structure, comprising a cylinder body (1), a piston rod (2), an outer sealing sleeve (3) and a sealing unit, wherein the cylinder body (1) is mounted at the rear end of the outer sealing sleeve (3), and the piston rod (2) is telescopically mounted at the front end of the cylinder body (1); Features: The sealing unit comprises a first sealing structure (12), a second sealing structure (14) and a third sealing structure (15); The first sealing structure (12) comprises, from outside to inside, a first sealing outer lip body (20) and a first sealing inner lip body (22), a plurality of first sealing inner lip bodies (22) are evenly distributed along the front-to-back direction on the inner side of the first sealing outer lip body (20), and the plurality of first sealing inner lip bodies (22) are all tilted toward the front end or the rear end, a first sealing support end (23) is provided at the top and the bottom of the first sealing outer lip body (20), and a first sealing O-ring (24) is installed between the first sealing support end (23) and the inner first sealing inner lip body (22); The second sealing structure (14) comprises a second sealing body (27), and the front end or rear end of the second sealing body (27) comprises a second sealing outer lip body (28) and a second sealing inner lip body (29) in sequence from the outside to the inside, the second sealing outer lip body (28) is inclined toward the outside, and the second sealing inner lip body (29) is inclined toward the inside, a second sealing outer lip body protrusion (30) is arranged on the inner side of the second sealing outer lip body (28), and a second sealing inner lip body protrusion (31) matched with the second sealing outer lip body protrusion (30) is arranged on the outer side of the second sealing inner lip body (29), and the second sealing outer lip body protrusion (30) is in contact with the second sealing inner lip body protrusion (31); The third sealing structure (15) comprises, from the inside to the outside, a third sealing inner lip body (33) and a third sealing outer lip body (34), wherein the third sealing outer lip body (34) is inclined toward the outside, and a second sealing O-ring (35) is installed between the third sealing inner lip body (33) and the third sealing outer lip body (34); A guide ring (13) is provided between the first sealing structure (12) and the second sealing structure (14), and between the second sealing structure (14) and the third sealing structure (15).

2. A combined sealing structure according to claim 1, characterized in that: A lubrication unit is installed in the cylinder body (1) at the front end of the sealing unit, and the lubrication unit comprises an injection groove (5), an injection channel (8) and impregnated cotton (9) in sequence from the outside to the inside. The injection groove (5) is installed on the outer sealing sleeve (3), an injection channel (8) extending into the cylinder body (1) is installed on the inner side of the injection groove (5), and impregnated cotton (9) is installed on the inner side of the injection channel (8).

3. A combined sealing structure according to claim 2, characterized in that: A plug (6) is installed on the outside of the injection groove (5), and the injection channel (8) is installed in the cylinder body (1) through a clamping ring (7).

4. A combined sealing structure according to claim 1, characterized in that: Support rings (4) are installed at the front end and the rear end of the inner side of the outer sealing sleeve (3).

5. A combined sealing structure according to claim 1, characterized in that: The sealing unit further comprises a sealing structure mounting seat (10) and a sealing support frame (11); the sealing structure mounting seat (10) is mounted on the inner middle part of the outer sealing sleeve (3); a sealing structure mounting groove for mounting the sealing support frame (11) is provided on the inner side of the sealing structure mounting seat (10); the sealing support frame (11) is mounted in the outer sealing structure mounting groove; a first sealing groove (16) for mounting a first sealing structure (12), a guide groove (17) for mounting a guide ring (13), a second sealing groove (18) for mounting a second sealing structure (14), and a third sealing groove (19) for mounting a third sealing structure (15) are provided on the inner side of the sealing support frame (11).

6. A combined sealing structure according to claim 1, characterized in that: A first sealing inner core (21) is installed on the inner side of the first sealing outer lip body (20), and a first sealing outer lip body raised contact end (25) is provided on the outer side of the top and bottom of the first sealing outer lip body (20), and a first sealing inner lip body raised contact end (26) is provided on the inner side of the first sealing inner lip body (22) at the top or bottom. The first sealing outer lip body raised contact end (25) and the first sealing inner lip body raised contact end (26) are both serrated raised structures.

7. A combined sealing structure according to claim 1, characterized in that: A second sealing inner lip body raised contact end (32) is provided on the inner side of the second sealing body (27), and the second sealing inner lip body raised contact end (32) is a sawtooth-shaped raised structure.

8. A combined sealing structure according to claim 1, characterized in that: A third sealing groove (36) is provided on one side of the top or bottom of the third sealing inner lip body (33), a third sealing friction block (37) is installed in the third sealing groove (36), and a third sealing inner lip body raised contact end (40) is provided on the inner side of the third sealing inner lip body (33), and the third sealing inner lip body raised contact end (40) is a sawtooth-shaped raised structure.

9. A combined sealing structure according to claim 1, characterized in that: A third sealing O-ring (38) is installed on the outer top of the third sealing outer lip body (34), and a fourth sealing O-ring (39) is installed on the outer bottom of the third sealing outer lip body (34).

10. A combined seal installation method according to any one of claims 1 to 9, characterized in that: The following steps are included in sequence: Step S1, a sealing structure mounting seat (10) 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 (11) is opened on the inner side of the sealing structure mounting seat (10), and the sealing support frame (11) is installed in the outer sealing structure mounting groove; Step S2, a first sealing groove (16) is provided at the rear end of the inner side of the sealing support frame (11), a second sealing groove (18) is provided at the middle part of the inner side of the sealing support frame (11), a third sealing groove (19) is provided at the front end of the inner side of the sealing support frame (11), a guide groove (17) is provided between the first sealing groove (16) and the second sealing groove (18) and between the second sealing groove (18) and the third sealing groove (19), the first sealing structure (12) is installed in the first sealing groove (16), the guide ring (13) is installed in the guide groove (17), the second sealing structure (14) is installed in the second sealing groove (18), and the third sealing structure (15) is installed in the third sealing groove (19); Step S3, supporting rings (5) are installed at the front and rear ends of the inner sides 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, 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 support ring (5) at the rear end, the sealing unit and the support ring (5) at the front end in sequence from back to front.

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