Multi-stage subdivision sealing device and mounting method thereof

Abstract

The invention discloses a multi-stage subdivision sealing device and a mounting method thereof, and relates to the technical field of sealing maintenance between a box body and a shaft of a crusher and other mechanical equipment, the multi-stage subdivision sealing device comprises an inner gland, and the inner gland is coaxially spliced to form a first-stage sealing layer; the central glands are coaxially spliced to form a secondary sealing layer; the outer glands are coaxially spliced to form a three-stage sealing layer; the first-stage sealing layer is fixed to the rotating shaft box body, the first-stage sealing layer, the second-stage sealing layer and the third-stage sealing layer are coaxially arranged, and the rotating shaft is rotationally arranged on the axis of the first-stage sealing layer, the axis of the second-stage sealing layer and the axis of the third-stage sealing layer. The problems that according to an existing crusher, sliding friction is conducted between a box body and a shaft for a long time, the powder leakage phenomenon is frequently generated, and a bearing is inconvenient to replace are solved.

Description

Technical Field

[0001] The invention relates to the technical field of seal maintenance between a box and a shaft of a crusher and other mechanical equipment, and in particular to a multi-stage split seal device and an installation method thereof. Background Art

[0002] A closed circular mechanical seal is used between the crushing roller shaft and the crusher body of the secondary crusher, and an internal skeleton oil seal is used for sealing inside the ring. Due to the long-term sliding friction between the body and the shaft, there is no oil lubrication on the surface of the oil seal. The long-term friction has a short service life, and powder leakage often occurs. The oil seal needs to be replaced frequently, which affects civilized production on site and is prone to fire hazards and other safety hazards.

[0003] Oil seal replacement requires the removal of the bearing, which cannot be used again once removed, making replacement difficult and costly. Replacing the drive end requires the displacement of the reducer, coupler and other devices, and re-alignment of the above devices is required when reinstalling them, which is time-consuming and difficult. Summary of the invention

[0004] In view of the problems that the box and the shaft of the above-mentioned existing crusher have long-term sliding friction, powder leakage often occurs, and the bearing is inconvenient to replace, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a multi-stage split sealing device and its installation method, which effectively solves the problems of easy damage of seals under sliding friction between the casing of large mechanical equipment and the rotating shaft, and the difficulty and high replacement cost of the sealing device.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-stage split sealing device, which includes an inner pressure cover, which is coaxially spliced ​​to form a primary sealing layer; a center pressure cover, which is coaxially spliced ​​to form a secondary sealing layer; an outer pressure cover, which is coaxially spliced ​​to form a tertiary sealing layer; the primary sealing layer is fixed to a rotating shaft housing, the primary sealing layer, the secondary sealing layer and the tertiary sealing layer are coaxially arranged, and the rotating shaft is rotatably arranged on the axis of the primary sealing layer, the secondary sealing layer and the tertiary sealing layer.

[0007] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: the two groups of inner pressure covers in the first-level sealing layer are centrally symmetrically arranged; the two end portions of the inner pressure covers are the first connecting end and the second connecting end, and the outer side wall of the first connecting end is provided with a first groove.

[0008] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: a first countersunk groove is symmetrically opened on the side wall of the first groove close to the end of the first connecting end; a first bolt groove is symmetrically opened on the end of the second connecting end, and the first countersunk grooves in one group of inner pressure covers are fixed to the first bolt grooves in another group of inner pressure covers by countersunk bolts; and a plurality of groups of first threaded holes are also equidistantly fixed on the two groups of inner pressure covers in the first-level sealing layer.

[0009] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: the two groups of center glands in the secondary sealing layer are centrally symmetrically arranged; a separating ring is coaxially fixed to the inner wall of the center gland, and the separating ring divides the inner cavity of the center gland into a first shaft sealing space and a second shaft sealing space, and the inner diameter of the first shaft sealing space is larger than the inner diameter of the second shaft sealing space.

[0010] As a preferred solution of the multi-stage split sealing device of the present invention, a first graphite packing and a second graphite packing are respectively fixed in the first shaft sealing space and the second shaft sealing space.

[0011] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: the two end portions of the center pressure cover are the third connecting end and the fourth connecting end; the outer wall of the third connecting end is provided with a second groove, and the side wall of the second groove close to the end portion of the third connecting end is symmetrically provided with a second countersunk groove; the end portion of the fourth connecting end is symmetrically provided with a second bolt groove, and the second countersunk groove in one group of inner center pressure covers is fixed to the second bolt groove in another group of center pressure covers by countersunk bolts.

[0012] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: a plurality of groups of second threaded holes are equidistantly provided on the two groups of center pressure covers in the secondary sealing layer, and third countersunk grooves are equidistantly provided between the second threaded holes, and the third countersunk grooves correspond to the positions of the first threaded holes and are fixed by countersunk bolts.

[0013] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: the two groups of external pressure covers in the three-stage sealing layer are symmetrically arranged in the center, the two end portions of the external pressure covers are the fifth connecting end and the sixth connecting end, and the outer side wall of the fifth connecting end is provided with a third groove; the side wall of the third groove close to the end portion of the fifth connecting end is symmetrically provided with a fourth countersunk groove; the end portion of the sixth connecting end is symmetrically provided with a third bolt groove, and the fourth countersunk groove in one group of external pressure covers is fixed to the third bolt groove in the other group of external pressure covers by countersunk bolts.

[0014] As a preferred solution of the multi-stage split sealing device of the present invention, wherein: a plurality of groups of fifth countersunk grooves are equidistantly provided on the two groups of outer pressure covers in the three-stage sealing layer, the fifth countersunk grooves correspond to the positions of the second threaded holes and are fixed by countersunk bolts; the inner pressure cover connection, the center pressure cover connection and the outer pressure cover connection are all staggered.

[0015] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for installing a multi-stage split sealing device, which is suitable for the above-mentioned multi-stage split sealing device, comprising splicing and fixing two inner pressure covers from both sides of the rotating shaft to form a primary sealing layer, and then welding them at the opening of the rotating shaft housing; after the secondary sealing layer is fixed in the splicing manner of the primary sealing layer, the second graphite packing is placed in the second shaft sealing space, and the secondary sealing layer is coaxially installed on the primary sealing layer by bolts, and then the first graphite packing is installed in the first shaft sealing space; the tertiary sealing layer is installed on the secondary sealing layer in the same way, and finally the installation is completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The multi-stage sealing device can perform sealing at multiple levels to prevent shutdown and maintenance due to damage to one seal. At the same time, it strengthens the sealing degree, effectively controls powder leakage from the box, and improves the reliability and stability of the equipment as a whole.

[0018] 2. The split sealing device is easy to maintain. There is no need to disassemble the shaft end device. The packing can be replaced by removing the bolts on the sealing device. The operation is simple and the maintenance time cost is low.

[0019] 3. Replacing seals does not require destroying the bearings, and the maintenance cost is low.

[0020] 4. The use of graphite packing is more advantageous in the sliding friction and wear of rotating mechanical equipment without lubricating oil, which greatly improves the service life of the seal and reduces the frequency of replacement.

[0021] 5. The device has low material requirements, low processing difficulty and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a schematic diagram of the overall structure of the multi-stage split sealing device of the present invention.

[0024] Figure 2It is a schematic diagram of the structure of the first-level sealing layer of the multi-stage split sealing device of the present invention.

[0025] Figure 3 It is a schematic diagram of the secondary sealing layer structure of the multi-stage split sealing device of the present invention.

[0026] Figure 4 It is a cross-sectional view of the secondary sealing layer of the multi-stage split sealing device of the present invention.

[0027] Figure 5 It is a schematic diagram of the three-stage sealing layer structure of the multi-stage split sealing device of the present invention.

[0028] Figure 6 It is an exploded view of the multi-stage split sealing device of the present invention.

[0029] Figure 7 It is a schematic diagram of the installation of the multi-stage split sealing device of the present invention. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0034] Example 1

[0035] Reference Figure 1 to Figure 7, which is the first embodiment of the present invention, provides a multi-stage split sealing device, which includes an inner gland 100, which is coaxially spliced ​​to form a primary sealing layer A; a central gland 200, which is coaxially spliced ​​to form a secondary sealing layer B; an outer gland 300, which is coaxially spliced ​​to form a tertiary sealing layer C;

[0036] The primary sealing layer A is fixed to the shaft housing, the primary sealing layer A, the secondary sealing layer B and the tertiary sealing layer C are coaxially arranged, and the shaft is rotatably arranged on the axes of the primary sealing layer A, the secondary sealing layer B and the tertiary sealing layer C.

[0037] The inner pressure cover 100 , the center pressure cover 200 and the outer pressure cover 300 are preferably made of steel, and a circular ring shape can be formed by turning the steel plate.

[0038] Furthermore, the inner pressure cover 100, the center pressure cover 200 and the outer pressure cover 300 are respectively spliced ​​and combined in pairs to form a primary sealing layer A, a secondary sealing layer B and a tertiary sealing layer C, thereby realizing three-layer sealing to protect the crusher shaft and the interior of the box.

[0039] Example 2

[0040] Reference Figure 1 to Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the two groups of inner pressure covers 100 in the primary sealing layer A are centrally symmetrically arranged; the two end portions of the inner pressure cover 100 are the first connecting end 101 and the second connecting end 102, and the outer side wall of the first connecting end 101 is provided with a first groove 101a.

[0041] The inner gland 100 is a semicircular ring structure, the first connection end 101 and the second connection end 102 are the end portions of the inner gland 100 on both sides, and the two sets of inner glands 100 are centrally symmetrically connected end to end.

[0042] A first countersunk groove 101a-1 is symmetrically provided on the side wall of the first groove 101a near the end of the first connecting end 101; a first bolt groove 102a is symmetrically provided at the end of the second connecting end 102, and the first countersunk groove 101a-1 in one group of inner pressure covers 100 is fixed to the first bolt groove 102a in another group of inner pressure covers 100 by countersunk bolts; a plurality of groups of first threaded holes W1 are also equidistantly fixed on the two groups of inner pressure covers 100 in the primary sealing layer A, and in the present embodiment, preferably six groups of first threaded holes W1 are equidistantly provided.

[0043] The two groups of central glands 200 in the secondary sealing layer B are centrally symmetrically arranged; a separator ring 201 is coaxially fixed to the inner wall of the central gland 200, and the separator ring 201 divides the inner cavity of the central gland 200 into a first shaft sealing space K1 and a second shaft sealing space K2, and the inner diameter of the first shaft sealing space K1 is larger than the inner diameter of the second shaft sealing space K2.

[0044] The central gland 200 is also a semicircular ring structure, and the first shaft sealing space K1 and the second shaft sealing space K2 are in contact with the inner gland 100 and the outer gland 300 respectively.

[0045] A first graphite packing K11 and a second graphite packing K21 are fixed in the first shaft sealing space K1 and the second shaft sealing space K2 respectively.

[0046] In this embodiment, the first graphite packing K11 and the second graphite packing K21 are both strip-shaped graphite packings, preferably G-200 type, which can be cut to the required length and placed in the first shaft sealing space K1 and the second shaft sealing space K2.

[0047] The two ends of the center pressure cover 200 are the third connection end 202 and the fourth connection end 203; the outer wall of the third connection end 202 is provided with a second groove 202a, and the side wall of the second groove 202a close to the end of the third connection end 202 is symmetrically provided with a second countersunk groove 202a-1.

[0048] The end of the fourth connection end 203 is symmetrically provided with a second bolt groove 203a, and the second countersunk groove 202a-1 in one group of inner center glands 200 is fixed to the second bolt groove 203a in another group of center glands 200 by countersunk bolts.

[0049] A plurality of groups of second threaded holes W2 are equidistantly provided on the two groups of center glands 200 in the secondary sealing layer B. Third countersunk grooves 204 are equidistantly provided between the second threaded holes W2. The third countersunk grooves 204 correspond to the positions of the first threaded holes W1 and are fixed by countersunk bolts.

[0050] Preferably, the second threaded holes W2 and the third countersunk grooves 204 are each provided with 6 groups, for a total of 12 groups, which are cross-arranged.

[0051] The two groups of outer pressure covers 300 in the third-level sealing layer C are centrally symmetrically arranged, and the two ends of the outer pressure cover 300 are the fifth connecting end 301 and the sixth connecting end 302. The outer side wall of the fifth connecting end 301 is provided with a third groove 301a, wherein the outer pressure cover 300 is also a semicircular ring structure.

[0052] A fourth countersunk groove 301a-1 is symmetrically provided on the side wall of the third groove 301a near the end of the fifth connecting end 301; a third bolt groove 302a is symmetrically provided at the end of the sixth connecting end 302, and the fourth countersunk groove 301a-1 in one group of outer pressure covers 300 and the third bolt groove 302a in another group of outer pressure covers 300 are fixed by countersunk bolts.

[0053] Several groups of fifth countersunk grooves 303 are equidistantly provided on the two groups of outer pressure covers 300 in the third-level sealing layer C. The fifth countersunk grooves 303 correspond to the positions of the second threaded holes W2 and are fixed by countersunk bolts. The connection points of the inner pressure cover 100, the center pressure cover 200 and the outer pressure cover 300 are all staggered.

[0054] Furthermore, since there is no intersection at the dividing points of the primary sealing layer A, the secondary sealing layer B and the tertiary sealing layer C, powder leakage at the intersections can be effectively prevented, and then leakage from the dividing gaps.

[0055] It should be noted that the inner diameter of the inner gland 100 is larger than the inner diameter of the outer gland 300, so as to facilitate the installation and placement of the innermost graphite packing.

[0056] During use, before the inner gland 100 is fixed on the crusher housing, a layer of graphite packing can be sleeved on the crusher shaft, which is the first layer of sealing, and the subsequent second graphite packing K21 is the second layer of sealing, and the outermost first graphite packing K11 is the third layer of sealing.

[0057] When the shaft rotates, the two adjacent sealing layers fit tightly together, and the sealing filling of the graphite packing can effectively reduce the wear of the shaft. The rest of the structure is the same as that of the first embodiment.

[0058] Example 3

[0059] Reference Figure 1 to Figure 7 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that it provides a method for installing a multi-stage split sealing device, which is applicable to the multi-stage split sealing device in the above embodiment, and includes the following steps:

[0060] Two inner glands 100 are spliced ​​and fixed from both sides of the shaft to form a primary sealing layer A, and then welded to the opening of the shaft housing.

[0061] Specifically, before installing the inner gland 100 , at least one circle of graphite packing may be disposed outside the rotating shaft as required.

[0062] Furthermore, the two inner glands 100 are spliced ​​together from both sides of the rotating shaft, and the inner glands 100 are fixedly connected end to end by countersunk bolts to form an annular primary sealing layer A, and then the primary sealing layer A is integrally welded and fixed to the crusher housing.

[0063] It should be noted that during the installation process, it is necessary to ensure that the axis of the primary sealing layer A coincides with the axis of the rotating shaft.

[0064] After the secondary sealing layer B is fixed in the same way as the primary sealing layer A, the second graphite packing K21 is placed in the second shaft sealing space K2, and then the secondary sealing layer B is coaxially installed on the primary sealing layer A by bolts, and then the first graphite packing K11 is installed in the first shaft sealing space K1.

[0065] Specifically, after the primary sealing layer A is fixed, the two central glands 200 are spliced ​​and fixed to each other from both sides of the shaft in the same manner as the primary sealing layer A to form an annular secondary sealing layer B. At this time, the second shaft sealing space K2 is formed.

[0066] Furthermore, the second graphite packing K21 is inserted into the second shaft sealing space K2 and fixed, and the third countersunk groove 204 is aligned with the first threaded hole W1 and fixed with a countersunk bolt. At this time, the countersunk bolt will be completely embedded in the third countersunk groove 204, and the second graphite packing K21 is completely pressed in the second shaft sealing space K2.

[0067] Furthermore, the first graphite packing K11 can be placed into the first shaft sealing space K1 by referring to the installation method of the second graphite packing K21 to ensure that it will not fall off, and then preparations for the installation of the third-level sealing layer C can be made.

[0068] Use the same method to install the tertiary sealing layer C onto the secondary sealing layer B and finally complete the installation.

[0069] Specifically, similarly, the two outer pressure covers 300 are clamped outside the rotating shaft from the left and right sides and fastened with countersunk bolts to form a three-level sealing layer C. Finally, the fifth countersunk groove 303 is aligned with the second threaded hole W2, and the final installation and fixation are completed with countersunk bolts. At this time, the overall installation of the device is completed.

[0070] The sealing device is designed in multiple stages. There is a sealing step between each stage and the next stage. The gap between the steps is filled with sealing elements to achieve multiple sealing and make the sealing tighter. In addition, each layer of sealing ring is split for easy maintenance.

[0071] Furthermore, the split cuts of each sealing layer are on the upper part of the sealing ring, which can reduce powder leakage, and the split cuts of the sealing ring form a certain angle with the radius line, so that the sides of the two halves of the split sealing ring can be tapped and fastened with bolts.

[0072] Furthermore, every two layers of sealing rings are fastened with countersunk bolts, and the nut hole of the outer sealing ring is a cone, so the countersunk can be completely embedded to facilitate the installation of the next level of sealing ring. There is no intersection on the split surface of each two adjacent layers of sealing rings to prevent powder leakage at the intersection. Finally, graphite packing is used for sealing filling to reduce the wear rate of the seal.

[0073] The remaining structure is the same as that of Example 2.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multi-stage split sealing device, characterized in that: include, An inner gland (100), wherein the inner gland (100) is coaxially spliced ​​to form a primary sealing layer (A); A central gland (200), wherein the central gland (200) is coaxially spliced ​​to form a secondary sealing layer (B); An external gland (300), wherein the external gland (300) is coaxially spliced ​​to form a three-level sealing layer (C); The primary sealing layer (A) is fixed to the shaft housing, the primary sealing layer (A), the secondary sealing layer (B) and the tertiary sealing layer (C) are coaxially arranged, and the shaft is rotatably arranged on the axes of the primary sealing layer (A), the secondary sealing layer (B) and the tertiary sealing layer (C).

2. The multi-stage split sealing device according to claim 1, characterized in that: The two groups of inner glands (100) in the primary sealing layer (A) are centrally symmetrically arranged; The two end portions of the inner pressure cover (100) are a first connecting end (101) and a second connecting end (102), and a first groove (101a) is formed on an outer side wall of the first connecting end (101).

3. The multi-stage split sealing device according to claim 2, characterized in that: A first countersunk groove (101a-1) is symmetrically provided on the side wall of the first groove (101a) close to the end of the first connecting end (101); The second connection end (102) is symmetrically provided with a first bolt groove (102a), and the first countersunk groove (101a-1) in one group of inner glands (100) and the first bolt groove (102a) in another group of inner glands (100) are fixed by countersunk bolts; A plurality of groups of first threaded holes (W1) are also equidistantly fixed on the two groups of inner glands (100) in the primary sealing layer (A).

4. The multi-stage split sealing device according to claim 3, characterized in that: The two sets of central glands (200) in the secondary sealing layer (B) are centrally symmetrically arranged; A separation ring (201) is coaxially fixed on the inner wall of the central gland (200), and the separation ring (201) separates the inner cavity of the central gland (200) into a first shaft sealing space (K1) and a second shaft sealing space (K2), and the inner diameter of the first shaft sealing space (K1) is greater than the inner diameter of the second shaft sealing space (K2).

5. The multi-stage split sealing device according to claim 4, characterized in that: A first graphite packing (K11) and a second graphite packing (K21) are respectively fixed in the first shaft sealing space (K1) and the second shaft sealing space (K2).

6. The multi-stage split sealing device according to claim 4 or 5, characterized in that: The two end portions of the central gland (200) are a third connecting end (202) and a fourth connecting end (203); A second groove (202a) is provided on the outer side wall of the third connecting end (202), and a second countersunk groove (202a-1) is symmetrically provided on the side wall of the second groove (202a) close to the end of the third connecting end (202); The fourth connection end (203) is symmetrically provided with a second bolt groove (203a), and the second countersunk groove (202a-1) in one group of inner center glands (200) and the second bolt groove (203a) in another group of center glands (200) are fixed by countersunk bolts.

7. The multi-stage split sealing device according to claim 6, characterized in that: A plurality of groups of second threaded holes (W2) are equidistantly provided on the two groups of central glands (200) in the secondary sealing layer (B), and third countersunk grooves (204) are equidistantly provided between the second threaded holes (W2). The third countersunk grooves (204) correspond to the positions of the first threaded holes (W1) and are fixed by countersunk bolts.

8. The multi-stage split sealing device according to claim 7, characterized in that: The two groups of outer glands (300) in the third-level sealing layer (C) are centrally symmetrically arranged, the two ends of the outer gland (300) are a fifth connecting end (301) and a sixth connecting end (302), and the outer side wall of the fifth connecting end (301) is provided with a third groove (301a); A fourth countersunk groove (301a-1) is symmetrically provided on the side wall of the third groove (301a) close to the end of the fifth connecting end (301); The end of the sixth connection end (302) is symmetrically provided with a third bolt groove (302a), and the fourth countersunk groove (301a-1) in one group of outer pressure covers (300) and the third bolt groove (302a) in another group of outer pressure covers (300) are fixed by countersunk bolts.

9. The multi-stage split sealing device according to claim 7 or 8, characterized in that: A plurality of fifth countersunk grooves (303) are equidistantly provided on the two groups of outer glands (300) in the third-level sealing layer (C); the fifth countersunk grooves (303) correspond to the positions of the second threaded holes (W2) and are fixed by countersunk bolts; The inner gland (100) connection, the center gland (200) connection and the outer gland (300) connection are all staggered.

10. A method for installing a multi-stage split sealing device, characterized in that: A multi-stage split sealing device suitable for use in any one of claims 5 to 9, comprising: Two inner glands (100) are spliced ​​and fixed from both sides of the shaft to form a primary sealing layer (A), and then welded to the opening of the shaft housing; After the secondary sealing layer (B) is fixed in the same way as the primary sealing layer (A), the second graphite packing (K21) is placed in the second shaft sealing space (K2), and then the secondary sealing layer (B) is coaxially installed on the primary sealing layer (A) by bolts, and then the first graphite packing (K11) is installed in the first shaft sealing space (K1); Use the same method to install the tertiary sealing layer (C) onto the secondary sealing layer (B) to complete the installation.

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