Quick-replaceable main drive seal structure of shield machine

[0024] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the following embodiments, that is, all simple equivalent changes and modifications made based on the scope of the patent application of the present invention and the content of the specification are still within the scope of the patent of the present invention.

[0025] Refer to figure 1 , Is a schematic diagram of the installation position of the main drive sealing structure of a shield machine that can be quickly replaced according to the present invention. The sealing structure 100 is installed on the cutter head flange connecting the main drive 101 of the shield machine and the cutter head 102 .

[0026] Refer to figure 2 , 3 , Is a fast-replaceable shield machine main drive sealing structure according to the present invention, which includes a main drive frame 1 and a cutter head flange 2 for fixing the shield machine cutter head. The main drive frame is provided with The main drive mechanism that drives the cutter head of the shield machine to rotate. A sealing grease outlet 3 is formed between the outer end surface of the main drive frame and the inner end surface of the cutter head flange, and an annular seal is provided on the outside of the sealing grease outlet structure. The sealing structure includes an annular welding base plate 11, an annular sealing wear plate 12, an annular seal fixing plate 13, an annular lip seal 14, an annular inner sealing plate 15, an annular outer sealing plate 16, and an annular seal Connecting plate 17, the inner end surface of the welding bottom plate is fixed to the outer end surface of the cutter head flange, the inner end surface of the sealing wear plate is fixed to the outer end surface of the main drive frame, and the lip seal Both ends of the sealing plate are detachably fixed to the inner end surface of the sealing fixing plate through the inner sealing pressing plate and the outer sealing pressing plate; the inner side of the sealing fixing plate is locked and positioned on the outer surface of the welding bottom plate, and the lip The shape seal seals the gap between the inner end surface of the sealing fixing plate and the outer end surface of the sealing wear plate; the inner end surface of the sealing connecting plate abuts against the outer end surfaces of the welding bottom plate and the sealing fixing plate respectively, They are detachably fixedly connected by connecting screws 18 respectively.

[0027] Wherein, the inner sealing pressing plate and the outer sealing pressing plate are respectively detachably fixed to the sealing fixing plate by fixing screws 19, and the two ends of the lip seal are respectively pressed and fixed to the inner end surface of the sealing fixing plate The sealing strip 20 is provided between the inner side surface of the sealing fixing plate and the outer side surface of the welding bottom plate; the inner end surface of the sealing fixing plate is located outside the lip seal to prevent foreign matter from entering the lip shape The sealed protective plate 21; the annular welding bottom plate 11, the sealing wear plate 12, the sealing fixing plate 13, the inner sealing pressing plate 15, the outer sealing pressing plate 16 and the sealing connecting plate 17 are all formed by separate splicing.

[0028] For the installation position of the main drive sealing structure of the shield machine which can be quickly replaced, please refer to figure 2 It can be installed at the front end of the traditional main drive without changing the structural features of the original main drive. It can be easily replaced during construction. The case and replacement of the present invention will be described in detail below.

[0029] When the present invention is installed, firstly, the inner end surface of the welding bottom plate 11 is welded to the outer end surface of the cutter head flange 2, and the sealing wear plate 12 is welded to the outer end surface of the main drive frame 1; then, the lip seal 14 The two ends of the inner sealing plate 15 and the outer sealing plate 16 are respectively pressed on the inner end surface of the sealing fixing plate 13. The inner sealing pressing plate 15 and the outer fixing pressing plate 16 are respectively detachably fixed to the sealing fixing plate 13 by fixing screws 19, In this way, the lip seal is fixed on the sealing fixing plate to form an integrated structure; then, the inner side of the sealing fixing plate is clamped and positioned on the outer side of the welding bottom plate, in order to make a good seal between the two A sealing strip 20 is placed between the two; then, the inner end surface of the sealing connection plate 17 is pressed against the outer end surfaces of the welding bottom plate 11 and the sealing fixing plate 13 respectively, and on the sealing connection plate 17 and the welding bottom plate 11, and the sealing Connecting screws 18 are arranged between the connecting plate 17 and the sealing fixing plate 13 to fix them. At this time, the lip seal 14 is just positioned between the sealing fixing plate 13 and the sealing wear plate 12 and fills the gap between them Seal; The inner end surface of the seal fixing plate 13 is located on the outer side of the lip seal and a protective plate 21 is welded to prevent foreign matter from entering the lip seal 14. So far, the installation of the sealing structure is completed.

[0030] When the present invention is replaced, only the connecting screw 18 on the sealing connecting plate 17 can be removed to remove the sealing fixing plate 13, thereby exposing the lip seal 14, and then removing the seal on one side of the lip seal. The pressure plate can replace the lip seal 1. After the lip seal is replaced, the seal fixing plate 13 and the seal connecting plate 17 are fixed on the welding bottom plate 11 with connecting screws, and the seal replacement is completed.

[0031] In the normal construction of the present invention, the axial force and radial force received are respectively borne by the contact surface between the welding bottom plate and the sealing fixing plate, and the screw only bears a small load; the welding bottom plate and the sealing fixing plate are used between As a static seal, the sealing strip has a simple structure and a good sealing effect; for the convenience of welding and flaw detection, all necessary welds are facing outward; a protective plate is added to the outermost side of the sealing grease outlet direction, which can play a simple labyrinth seal. , And prevent large pieces of muck from damaging the lip seal during the construction process.

[0032] It can be seen that the installation and replacement of the present invention are very convenient, especially when replacing, it does not need to be completely disassembled, only the sealing connecting plate and the sealing fixing plate need to be disassembled to realize the replacement of the lip seal, which greatly shortens the maintenance and replacement. Time, improve the replacement efficiency, and facilitate the operation in a small space. The present invention can be used not only on the new main drive mechanism, but also on the old main drive structure. The old equipment can be upgraded and transformed without changing the main structure of the original equipment. It does not require a large cost. On the basis, the sealing structure of the present invention can be additionally added to the front end to protect the original sealing system. If it is damaged, it is very convenient to replace.