Grouting bearing package device for shield machine with automatic compensation function

Abstract

The present invention discloses a shield machine grouting bearing package device with automatic compensation function, including a bearing installation shell, a bearing, a spring installation plate, a spring, a positioning pin, a static ring, a dynamic ring and a rotating shaft, wherein the bearing is assembled in the inner hole of the bearing installation shell; one end of the rotating shaft is inserted into the bearing and fixed to the inner ring of the bearing; the static ring and the dynamic ring are relatively sealed and arranged between the hole wall of the inner hole of the bearing installation shell and the rotating shaft, the spring installation plate is fixed on the bearing installation shell, and the two ends of the spring are respectively fixed to the spring installation plate and the side surface of the static ring away from the dynamic ring through the positioning pin. In the case of failure of the sealing of the outer sealing ring of the dynamic ring of the bearing package device, the end faces of the static ring and the dynamic ring play the main sealing role, and the static ring is driven by the spring to fine-tune to continuously compensate for the wear between the dynamic ring and the static ring, so that the static ring is always tightly attached to the end face of the dynamic ring, thereby ensuring a good sealing effect and realizing the automatic compensation function.

Description

Technical Field

[0001] The invention belongs to the technical field of shield machine equipment, and specifically relates to a bearing package device, and in particular to a shield machine grouting bearing package device with an automatic compensation function. Background Art

[0002] The shield machine grouting bearing package is used in the shield machine grouting system, and its main functions are as follows: 1) Support the grouting stirring shaft. The grouting bearing package is installed at both ends of the grouting box. The stirring shaft is installed on the bearing in the bearing package through cooperation. The stirring shaft starts to rotate through the drive of the grouting stirring motor, thereby ensuring that the slurry in the grouting box does not solidify; 2) Sealing performance. During the rotation of the stirring shaft, the slurry in the box will flow out due to the eccentricity at both ends of the stirring shaft or the bending of the stirring shaft. A sealing ring is installed in the bearing package. When the stirring shaft is eccentric or slightly bent, the compression of the sealing ring can compensate for the gap caused by eccentricity or bending, thereby ensuring the sealing performance of the grouting box.

[0003] The existing grouting bearing package has the following structure: 1) 1 bearing and several sealing rings are installed in the bearing package; 2) 2 bearings and several sealing rings are installed in the bearing package. The above structure has the following defects: 1) The stirring shaft will inevitably produce eccentricity and bending during the rotation process. Installing 1 bearing in the bearing package will cause the stirring shaft support stiffness to be insufficient. After long-term operation, the stirring shaft eccentricity is too large. After the seal is worn, it cannot compensate for the gap caused by the excessive eccentricity of the stirring shaft, resulting in leakage of slurry from the bearing package; 2) 2 bearing supports will cause the stirring shaft to have 4 support points at both ends of the box. When the stirring shaft rotates, the eccentricity of the bearing packages at both ends will cause the stirring shaft to be "stirred". Long-term operation will cause eccentric wear of the sealing ring, disintegration of the bearing, jamming of the stirring shaft, leakage of slurry from the bearing package, etc. If the bearing package leaks slurry, it will seriously pollute the tunnel and make it difficult to clean the tunnel later; when the bearing package leaks slurry seriously, it will cause a large amount of slurry to flow out, and it will not be able to ensure the filling of the annular gap of the shield segment, causing major dangers such as surface settlement, and at the same time causing problems such as slow construction progress and increased construction costs. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a shield machine grouting bearing package device with automatic compensation function, which can effectively compensate for the wear of the sealing ring, and can also adaptively adjust the eccentricity and bending of the agitator shaft, thereby achieving the purpose of increasing the service life of the bearing package and enhancing the operating stability and sealing of the bearing package.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a shield machine grouting bearing package device with automatic compensation function, including a bearing mounting shell, a bearing, a spring mounting plate, a spring, a positioning pin, a static ring, a dynamic ring and a rotating shaft, the bearing mounting shell has an inner hole with one end open, the bearing is assembled in the inner hole, and the outer ring of the bearing is fixed to the hole wall of the inner hole; one end of the rotating shaft is inserted into the bearing and fixed to the inner ring of the bearing; the static ring and the dynamic ring are relatively sealed and arranged between the hole wall of the inner hole of the bearing mounting shell and the rotating shaft, the The inner ring of the dynamic ring is sealed and fixedly connected to the rotating shaft, and the outer ring of the dynamic ring is provided with a first sealing ring that is sealed and connected to the hole wall of the inner hole of the bearing mounting housing; the outer ring of the static ring is provided with a second sealing ring that is sealed and connected to the hole wall of the inner hole of the bearing mounting housing, and the inner ring of the static ring is provided with a third sealing ring that is sealed and connected to the outer side surface of the rotating shaft; the spring mounting plate is fixed to the bearing mounting housing and is located outside a side surface of the static ring away from the dynamic ring, and the two ends of the spring are respectively fixed to the spring mounting plate and a side surface of the static ring away from the dynamic ring by locating pins.

[0006] As a further improvement of the present invention, the radius of the inner hole of the bearing mounting housing increases in a stepped shape from the inside to the outside, and the bearing is installed at the second step position of the inner hole. A pressure cover with an L-shaped cross-section is fixed on the side walls of the second step and the third step of the inner hole, and the inner end of the pressure cover is pressed and fixed on the side of the outer ring of the bearing.

[0007] As a further improvement of the present invention, the spring mounting plate and the gland are fixed to the gland by the same bolt.

[0008] As a further improvement of the present invention, the positioning pin and the spring mounting plate are assembled through interference fit, and the spring is positioned by a protruding portion of the positioning pin.

[0009] As a further improvement of the present invention, a grease injection hole is provided on the bearing mounting housing.

[0010] As a further improvement of the present invention, the inner ring of the moving ring is sealed and fixedly connected to the rotating shaft via a flat key and an O-ring.

[0011] The beneficial effects of the present invention are as follows: the shield machine grouting bearing package device with automatic compensation function has the function of automatically compensating for sealing ring wear. It can adapt to eccentricity or bending when the stirring shaft is eccentric or bent, and can compensate for it when the gap is too large, thereby ensuring the sealing performance of the bearing package, improving its service life, and enhancing its operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 for Figure 1 Schematic diagram of the partially enlarged structure.

[0014] Combined with the accompanying drawings, the following description is given:

[0015] 1——bearing mounting housing; 2——bearing;

[0016] 3——pressure cover; 4——spring mounting plate;

[0017] 5——spring; 6——locating pin;

[0018] 7——static ring; 8——dynamic ring;

[0019] 9——rotating shaft; 71——second sealing ring;

[0020] 72——the third sealing ring; 81——the first sealing ring;

[0021] 82——Flat key; 83——O-ring. DETAILED DESCRIPTION

[0022] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the following embodiments, that is, any simple equivalent changes and modifications made within the scope of the present invention's patent application and the contents of the specification are still within the scope of the present invention's patent.

[0023] A shield machine grouting bearing package device with automatic compensation function includes a bearing mounting housing 1, a bearing 2, a pressure cover 3, a spring mounting plate 4, a spring 5, a positioning pin 6, a static ring 7, a dynamic ring 8, a rotating shaft 9, etc.

[0024] The bearing mounting housing 1 is a housing for mounting the spherical roller bearing 2. The inner hole of the bearing mounting housing 1 and the outer ring of the bearing 2 are assembled through a matching relationship. A grease hole is processed on the bearing mounting housing 1, and grease can be injected into the inner cavity of the housing through an automatic grease injection pump to facilitate lubrication of the bearing 2 and other parts in the bearing mounting housing 1.

[0025] In order to facilitate installation, the inner hole radius of the bearing installation housing 1 increases in a stepped shape from the inside to the outside, and the bearing is installed at the second step position of the inner hole. A gland 3 with an L-shaped cross section is fixed on the side walls of the second and third steps of the inner hole, and the inner end of the gland is pressed and fixed on the side of the outer ring of the bearing 2. That is, the gland 3 is used to press the end face of the outer ring of the bearing 2 to prevent the outer ring from rotating when the bearing is working, and the gland 3 is connected to the bearing installation housing 1 by bolts.

[0026] The spring mounting plate 4 is used to install the positioning pin 6 and the spring 5. The positioning pin 6 and the spring mounting plate 4 are assembled by interference fit. The spring 5 is positioned by the protruding part of the positioning pin 6. The spring 5 mainly provides the clamping force between the static ring 7 and the dynamic ring 8.

[0027] The stationary ring 7 and the dynamic ring 8 are relatively sealed and arranged between the hole wall of the inner hole of the bearing mounting housing 1 and the rotating shaft 9. The inner ring of the dynamic ring is sealed and fixedly connected to the rotating shaft. The outer ring of the dynamic ring is provided with a first sealing ring 81 which is sealed and connected to the hole wall of the inner hole of the bearing mounting housing 1; the outer ring of the stationary ring is provided with a second sealing ring 71 which is sealed and connected to the hole wall of the inner hole of the bearing mounting housing 1, and the inner ring of the stationary ring is provided with a third sealing ring 72 which is sealed and connected to the outer side surface of the rotating shaft.

[0028] The stationary ring 7 is divided into two parts, one part is a metal main structure, and the other part is a rubber structure, namely, a second sealing ring 71 and a third sealing ring 72 which are bonded to the inner ring and the outer ring of the metal structure by a special bonding process. When the bearing package is working, the stationary ring 7 does not rotate with the rotating shaft 9.

[0029] The moving ring 8 is divided into two parts, one part is a metal main structure, and the other part is a rubber structure, that is, a first sealing ring 81 bonded to the outer ring of the metal main body through a special bonding process; when the bearing package is working, the moving ring 8 rotates with the rotating shaft 9, and a flat key 82 and an O-ring 83 are installed between the moving ring 8 and the rotating shaft 9. The flat key transmits the rotational motion, and the O-ring acts as a seal to prevent the slurry in the slurry box from entering the bearing package through the gap between the moving ring 8 and the rotating shaft 9.

[0030] One end of the rotating shaft 9 is matched with the inner hole of the bearing 2, and the other end is connected with the stirring shaft in the grouting box. When the bearing package is working, the rotating shaft 9, the inner ring of the bearing 2, and the moving ring 8 all rotate accordingly.

[0031] The contact area between the end faces of the static ring 7 and the dynamic ring 8 is a sealing surface. When the rubber sealing ring of the dynamic ring 8 fails, the sealing surface can still play a sealing role, thereby effectively preventing the slurry from entering the shell cavity and damaging the bearing, causing the grouting mixing system to fail and shut down.

[0032] Before the bearing package device works, the cavity is filled with grease through the grease hole on the bearing mounting housing 1. When the bearing package works, the grease is continuously injected into the cavity. At the same time, the rotating shaft 9, the inner ring of the bearing 2, and the moving ring 8 rotate when the bearing package works, and the other structural parts do not rotate.

[0033] At the beginning of the operation of the bearing package, the first sealing ring 81 bonded to the outer ring of the dynamic ring 8 plays a major sealing role. At this time, the sealing mainly relies on the pre-compression of the first sealing ring 81. At the same time, due to the eccentricity of the bearing packages at both ends of the agitator shaft and the bending of the agitator shaft due to the assembly accuracy, the axis of the rotating shaft 9 and the axis of the bearing mounting housing 1 are not coincident, and the axis of the dynamic ring 8 will also deviate from the axis of the bearing mounting housing 1. At this time, the static ring 7 will fit tightly with the end face of the dynamic ring 8 under the pre-pressure of the spring 5, thereby ensuring the sealing performance of the static ring 7 and the dynamic ring 8 end face seals. When the lubricating grease is continuously injected into the cavity, part of the grease will continuously enter the housing through the sealing surface of the static ring 7, the sealing surface of the static ring 7 and the dynamic ring 8, and the sealing surface of the dynamic ring 8, thereby effectively preventing the slurry from entering the bearing package.

[0034] In the case that the outer ring seal of the dynamic ring 8 fails, the sealing surfaces of the static ring 7 and the dynamic ring 8 end faces play the main sealing role. As the bearing package runs, the contact end faces of the static ring 7 and the dynamic ring 8 will gradually wear out. However, under the action of the spring 5, the static ring 7 will continuously compensate for the wear and fit tightly to the end face of the dynamic ring 8, thereby achieving a better sealing effect.

[0035] It can be seen that the shield machine grouting bearing package device with automatic compensation function is provided with a static ring and a dynamic ring, and the static ring is connected to the bearing mounting housing through a spring and a spring mounting plate. In the case of failure of the seal of the dynamic ring outer sealing ring, the end faces of the static ring and the dynamic ring play a major sealing role, and the static ring is driven by the spring to fine-tune to continuously compensate for the wear between the dynamic ring and the static ring, so that the static ring is always tightly attached to the end face of the dynamic ring, thereby ensuring a good sealing effect and realizing the automatic compensation function.

Claims

1. A shield machine grouting bearing package device with automatic compensation function, characterized in that: The invention comprises a bearing mounting shell (1), a bearing (2), a spring mounting plate (4), a spring (5), a positioning pin (6), a stationary ring (7), a dynamic ring (8) and a rotating shaft (9); the bearing mounting shell (1) has an inner hole with an opening at one end, the bearing is assembled in the inner hole, and the outer ring of the bearing is fixed to the hole wall of the inner hole; the bearing mounting shell is also processed with a lubricating grease hole so that the inner cavity of the shell can be greased by an automatic grease injection pump; one end of the rotating shaft (9) is inserted into the bearing (2) and fixed to the inner ring of the bearing (2), and the other end is connected to the stirring shaft in the grouting box; the stationary ring (7) and the dynamic ring (8) are relatively sealed and arranged between the hole wall of the inner hole of the bearing mounting shell (1) and the rotating shaft (9); the dynamic ring The inner ring of the moving ring is sealed and fixedly connected to the rotating shaft, the outer ring of the moving ring is provided with a first sealing ring (81) which is sealed and connected to the hole wall of the inner hole of the bearing mounting housing (1); the outer ring of the stationary ring is provided with a second sealing ring (71) which is sealed and connected to the hole wall of the inner hole of the bearing mounting housing (1), and the inner ring of the stationary ring is provided with a third sealing ring (72) which is sealed and connected to the outer side surface of the rotating shaft; the spring mounting plate is fixed to the bearing mounting housing (1) and is located outside a side surface of the stationary ring away from the moving ring, the two ends of the spring are respectively fixed to the spring mounting plate and a side surface of the stationary ring away from the moving ring by locating pins, and the inner ring of the moving ring is sealed and fixedly connected to the rotating shaft by a flat key (82) and an O-ring (83); In the initial stage of operation of the bearing package, the first sealing ring (81) bonded to the outer ring of the moving ring (8) plays the main sealing role. At this time, the sealing is mainly based on the pre-compression of the first sealing ring (81). At the same time, due to the assembly accuracy of the bearing packages at both ends of the stirring shaft, eccentricity and bending of the stirring shaft are inevitably generated, causing the axis of the rotating shaft (9) to not coincide with the axis of the bearing installation housing (1), and the axis of the moving ring (8) will also deviate from the axis of the bearing installation housing (1). At this time, the static ring (7) will fit tightly with the end face of the moving ring (8) under the action of the pre-pressure of the spring (5), thereby ensuring the sealing performance of the static ring (7) and the dynamic ring (8) end face seals. When the lubricating grease is continuously injected into the inner cavity of the housing, part of the grease will continuously enter the grouting box through the sealing surface of the stationary ring (7), the sealing surface between the stationary ring (7) and the moving ring (8), and the sealing surface of the moving ring (8), thereby effectively preventing the slurry from entering the bearing package; when the first sealing ring (81) on the outer ring of the moving ring (8) fails, the sealing surface of the end face of the stationary ring (7) and the moving ring (8) plays a major sealing role. As the bearing package runs, the contact end faces of the stationary ring (7) and the moving ring (8) gradually wear out, but the stationary ring (7) will continuously compensate for the wear under the action of the spring (5) and fit tightly to the end face of the moving ring (8).

2. The shield machine grouting bearing package device with automatic compensation function according to claim 1 is characterized in that: The radius of the inner hole of the bearing mounting housing (1) increases in a stepped shape from the inside to the outside, and the bearing is mounted at the second step position of the inner hole. A pressure cover (3) with an L-shaped cross section is fixed on the side walls of the second step and the third step of the inner hole, and the inner end of the pressure cover is pressed and fixed on the side surface of the outer ring of the bearing (2).

3. The shield machine grouting bearing package device with automatic compensation function according to claim 2 is characterized in that: The spring mounting plate and the gland are fixed to the gland (3) by the same bolt.

4. The shield machine grouting bearing package device with automatic compensation function according to claim 2 is characterized in that: The positioning pin and the spring mounting plate are assembled through interference fit, and the spring is positioned by the protruding part of the positioning pin.

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