CN219262371U - Novel transition section structure of central rotary joint of earth pressure balance shield machine - Google Patents
Novel transition section structure of central rotary joint of earth pressure balance shield machine Download PDFInfo
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- CN219262371U CN219262371U CN202320175622.2U CN202320175622U CN219262371U CN 219262371 U CN219262371 U CN 219262371U CN 202320175622 U CN202320175622 U CN 202320175622U CN 219262371 U CN219262371 U CN 219262371U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a novel transition section structure of a rotary joint in the center of a soil pressure balance shield machine, which comprises two half-ring pipeline cylinders, a force transmission block, a transition section hollow shaft, a pressing plate, two-wing soil sand seals, a protective cover, an L-shaped seal, a rubber seal gasket, an O-shaped ring, a pressing cover, a front shield soil sand seal seat, two pressing rings and three soil sand seals; the two semi-ring pipeline cylinders, the force transmission block and the transition section hollow shaft form a composite flexible connection which is used as a force transmission mechanism for transmitting rotation torque; the soil and sand sealing system is composed of a pressing plate, two wing type soil and sand seals, a protective cover, an L-shaped seal, a rubber sealing gasket, an O-shaped ring, a pressing cover, a front shield soil and sand sealing seat, two pressing rings and three soil and sand seals. The structure design of the shield machine is unique and ingenious, the adaptability of the transition section structure of the central rotary joint of the earth pressure balance shield machine is greatly improved, the fault risk of the central rotary joint is reduced, the use safety of shield machine equipment is further guaranteed, and meanwhile, the shield machine has good economical efficiency.
Description
Technical Field
The utility model belongs to the technical field of industrial power, and particularly relates to a structural design of a transition section of a central rotary joint of a soil pressure balance shield machine.
Background
The shield tunneling machine is equipment for tunneling construction of an underground tunnel, the cutter head is a part for cutting soil on the shield tunneling machine, the cutter head rotates in the soil to work, a space between the cutter head and a front shield is called a soil bin, the soil bin is filled with sediment and water, and meanwhile, certain water and soil pressure is also applied in the soil bin; the central rotary joint is a channel for conveying soil body improvement substances (such as bentonite, water, foam and the like are injected into the front surface of the cutter head) to the cutter head which rotates at the front end of the shield machine, and is also a channel of a hydraulic control oil way for detecting the abrasion of the cutter (capable of maintaining pressure) by a profiling cutter (telescopic) on the cutter head, so that once the central rotary joint is damaged, the cutter head at the front end of the shield machine cannot work normally, and the whole tunneling construction of a tunnel is seriously influenced.
The central rotary joint comprises a central rotary joint (composed of a stator and a rotor) and a transition section. The central rotary joint transition section is a structure between the cutter head and the central rotary joint, and is composed of a soft connection and a soil and sand sealing system.
At present, in the construction process of the shield machine, the cutter head of the shield machine is always subjected to unbalanced stress, impact and local elastic deformation in all directions, and the normal operation of the central rotary joint is directly influenced through the transmission of the connecting part. Due to the design limitation of the existing central rotary joint transition section structure, and the factors of shield machine manufacturing, installation positioning errors, cutter deformation and the like, the central rotary joint transition section of the shield machine can be damaged to different degrees in operation and has adverse effects on normal construction. In order to get rid of trouble of construction caused by faults of the existing central rotary joint transition section of the shield machine and realize the performance upgrading of the shield machine, the structure of the central rotary joint transition section is urgently required to be adaptively modified.
Disclosure of Invention
The utility model aims at: the novel transition section structure of the central rotary joint is applied to a soil pressure balance shield machine, so that the central rotary joint can safely and stably work, and the construction requirements of various working conditions are adapted and met.
The technical scheme of the utility model is as follows:
the utility model provides a novel changeover portion structure of earth pressure balance shield machine center rotary joint, its characterized in that includes two semi-ring pipeline drum 1, biography power piece 4, changeover portion hollow shaft 5 to and clamp plate 2, two wing formula soil sand seal 3, shield lid 6, L shape seal 7, rubber seal 8, O shape circle 9, gland 10, preceding shield soil sand seal seat 11, twice clamping ring 12, three soil sand seal 13:
wherein, the two semi-ring pipeline cylinders 1, the force transmission block 4 and the transition section hollow shaft 5 form a composite flexible connection which is used as a force transmission mechanism for transmitting rotation torque;
the two-wing soil-sand sealing system comprises a pressing plate 2, two-wing soil-sand seals 3, a protective cover 6, an L-shaped seal 7, a rubber sealing gasket 8, an O-shaped ring 9, a pressing cover 10, a front shield soil-sand sealing seat 11, two pressing rings 12 and three soil-sand seals 13.
The two semi-ring pipeline cylinders 1 are connected with the hydraulic fluid integrated block through the flanges at the front ends of the two semi-ring pipeline cylinders, and the rear ends of the two semi-ring pipeline cylinders are provided with shear grooves which are connected with the force transmission block 4 through screws; the transition section hollow shaft 5 is provided with a force transmission groove, the force transmission block 4 is matched with the force transmission groove, and proper fit clearances are arranged between the force transmission block 4 and the force transmission groove in the directions of the degrees of freedom, so that the jumping influence caused by the cutter head can be digested in the directions of the degrees of freedom.
The soil and sand sealing system comprises a first sealing structure and a second sealing structure, wherein the first sealing structure is used for preventing soil bin sediment and water from entering the two semi-ring pipeline cylinders 1, and the second sealing structure is used for preventing the soil bin sediment and water from entering the shield body of the shield machine.
The first sealing structure comprises a pressing plate 2, two-wing type soil sand seals 3 and lithium grease butter, the pressing plate 2 and the two-wing type soil sand seals 3 are fixed on a transition section hollow shaft 5 by screws, the two-wing type soil sand seals 3 are positioned between the transition section hollow shaft 5 and the two semi-ring pipeline cylinder 1 to play a role in blocking silt and water, and the lithium grease butter is fully coated in the two-wing type soil sand seals 3.
The second seal structure includes protective cover 6, L shape seal 7, rubber seal 8, O shape circle 9, gland 10, front shield soil sand seal seat 11, twice clamping ring 12, three soil sand seal 13, wherein:
the shield cover 6 is fixed on the shield soil sand sealing seat 11 in front of the shield machine by screws, the rubber sealing gasket 8 is arranged at the joint surface of the shield cover 6 and the shield cover 6, the L-shaped sealing 7 is arranged on the shield cover 6, the section of the L-shaped sealing 7 is in an inverted L shape, a circle of intermittent opening is arranged in the inner hole of the L-shaped sealing, when the shield machine is in a non-working state, the L-shaped sealing opening is automatically closed under the action of water and soil pressure, the invasion of sediment and water in the soil bin into a second sealing structure area can be prevented, when the shield machine is in a working and running state, the L-shaped sealing is opened under the pressure of lubricating grease, the lubricating grease can overflow to the soil bin, and the L-shaped sealing has a one-way valve function.
Three soil and sand seals 13 are arranged in the front shield soil and sand seal seat 11, and the section of each soil and sand seal 13 is in a lip shape; the front end of each path of soil and sand seal is provided with the gland 10 or the pressure ring 12, and when the shield machine works, concentrated lubricating grease is injected into the front end of the soil and sand seal 13 through the gland 10 or the pressure ring 12 to form a grease cavity, and the grease cavity and the three paths of soil and sand seals 13 form a partition barrier together for sediment and water in the soil bin.
The gland 10 and the two pressure rings 12 are used for compressing three soil and sand seals 13.
The O-shaped ring 9 at the gland 10 is used for preventing sediment and water in the soil and sand seal oil cavity at the leftmost side of the second sealing structure.
Compared with the prior art, the utility model has the beneficial effects that:
the technical scheme of the utility model is that the soft connection and the soil and sand sealing system are separated, so that the functions of the soft connection and the soil and sand sealing system are fully exerted.
The utility model has unique and ingenious structural design, greatly improves the adaptability of the transition section structure of the central rotary joint of the earth pressure balance shield machine, reduces the fault risk of the central rotary joint, further ensures the use safety of shield machine equipment, and simultaneously reduces the consumption of concentrated lubricating grease of the shield machine due to the L-shaped seal with the one-way valve function, which is created originally, and has good economy. The transition section structure of the central rotary joint has been applied to earth pressure balance shield machines and has received good expected effects.
Drawings
FIG. 1 is a schematic view of a central rotary joint construction employing a transition section structure of the present utility model
FIG. 2 is a cross-sectional view at A-A of FIG. 1, showing the coupled and uncoupled assembly of the two half-ring conduit cylinders 1
FIG. 3 is a cross-sectional view at B-B of FIG. 1, showing the assembly of the composite flexible connection of the two half-loop conduit cylinder 1, the force-transmitting block 4 and the hollow transition piece shaft 5
FIG. 4 is a structural outline of the transition section of the present utility model
FIG. 5 is a detailed view of the first seal structure
FIG. 6 is an enlarged view of a portion of the portion I of FIG. 1, i.e., a detailed view of a second seal structure
FIG. 7 is a closing view of an L-shaped seal opening
FIG. 8 is a view showing the opening of the L-shaped seal
FIG. 9 is a schematic diagram of a transition section of a rotary joint in the technical center of the Mitsubishi shield machine in a comparative example
Numerical marking:
two semi-ring pipeline cylinders 1, a pressing plate 2, two wing type soil and sand seals 3, a force transmission block 4, a transition section hollow shaft 5, a protective cover 6, an L-shaped seal 7, a rubber sealing gasket 8, an O-shaped ring 9, a pressing cover 10, a front shield soil and sand sealing seat 11, two pressing rings 12 and three soil and sand seals 13,
the transition section connecting shaft 14, the O-shaped sealing ring 15, the front shield floating support seat 16, the floating support soil-sand seal 17 and the floating sleeve 18.
Detailed Description
The technical solutions provided in the present application will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present application are preferably implemented, and are not limited to any form of the present application. The technical features or combinations of technical features described in the embodiments of the present application should not be regarded as isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations may also be included within the scope of the preferred embodiments of the present application, and should be understood by those skilled in the art to which the examples of the present application pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not limitative. Thus, other examples of the exemplary embodiments may have different values.
The drawings in the present application are all in a very simplified form and are all to a non-precise scale for the purpose of conveniently and clearly facilitating the description of the embodiments of the present application and are not intended to limit the limitations that the present application may implement. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure disclosed herein without affecting the effects and objectives achieved by the present application. And the same reference numbers appearing in the drawings throughout the application denote the same feature or element, and may be used in different embodiments.
As shown in fig. 1:
the utility model provides a novel changeover portion structure of earth pressure balance shield machine center rotary joint, its characterized in that includes two semi-ring pipeline drum 1, biography power piece 4, changeover portion hollow shaft 5 to and clamp plate 2, two wing formula soil sand seal 3, shield lid 6, L shape seal 7, rubber seal 8, O shape circle 9, gland 10, preceding shield soil sand seal seat 11, twice clamping ring 12, three soil sand seal 13:
wherein, the two semi-ring pipeline cylinders 1, the force transmission block 4 and the transition section hollow shaft 5 form a composite flexible connection which is used as a force transmission mechanism for transmitting rotation torque;
the two-wing soil-sand sealing system comprises a pressing plate 2, two-wing soil-sand seals 3, a protective cover 6, an L-shaped seal 7, a rubber sealing gasket 8, an O-shaped ring 9, a pressing cover 10, a front shield soil-sand sealing seat 11, two pressing rings 12 and three soil-sand seals 13.
Composite flexible connection
The two semi-ring pipeline cylinders 1 are connected with the hydraulic fluid integrated block through the flanges at the front ends of the two semi-ring pipeline cylinders, and the rear ends of the two semi-ring pipeline cylinders are provided with shear grooves which are connected with the force transmission block 4 through screws; the transition section hollow shaft 5 is provided with a force transmission groove, the force transmission block 4 is matched with the force transmission groove (see fig. 3 and 4), and proper fit clearances are arranged between the force transmission block 4 and the force transmission groove in the direction of each degree of freedom, so that the jumping effect brought by the cutter head can be digested in the direction of each degree of freedom.
The two half-ring pipeline cylinders 1 are important force transmission parts, and shear grooves are designed at the joints of the two half-ring pipeline cylinders 1 and the four force transmission blocks 4 to prevent the joint screws from being sheared. Meanwhile, the two-half-ring pipeline cylinder 1 is also a key assembly connector, and the cutter head and the central rotary joint can be conveniently connected and separated by designing the two-half-ring pipeline cylinder 1 (see fig. 2).
The working principle is as follows:
in the rotating process of the cutterhead, the rotating torque is transmitted to the hydraulic fluid integrated block, then the hydraulic fluid integrated block is transmitted to the two half-ring pipeline cylinders 1, and the two half-ring pipeline cylinders 1 transmit the rotating torque to the transition section hollow shaft 5 through the four force transmission blocks 4, so that the central rotary joint rotor is driven to rotate along with the rotation of the cutterhead. The cutter head transmits rotation torque power and is also transmitted to the central rotary joint at the transition section and the rear part under the influence of unbalanced stress and impact and local elastic deformation, the four force transmission blocks 4 and the force transmission grooves on the hollow shaft 5 of the transition section have proper fit clearances in the directions of all degrees of freedom, and the soft connection can digest the jumping influence brought by the cutter head in the directions of all degrees of freedom, so that the rotor of the central rotary joint shown in fig. 1 can stably rotate, and the stator of the central rotary joint can be fixed on the front shield soil and sand sealing seat 11 of the shield machine.
Second, soil sand sealing system
The soil and sand sealing system comprises a first sealing structure and a second sealing structure, wherein the first sealing structure is used for preventing sediment and water in a soil bin from entering the two semi-ring pipeline cylinder 1, and the second sealing structure is used for preventing sediment and water from entering the shield body of the shield machine.
Referring to fig. 5, the first sealing structure comprises a pressing plate 2, a two-wing type soil-sand seal 3 and lithium grease butter, the pressing plate 2 and the two-wing type soil-sand seal 3 are fixed on a transition section hollow shaft 5 by screws, the two-wing type soil-sand seal 3 is positioned between the transition section hollow shaft 5 and the two-half-ring pipeline cylinder 1 to play a role in blocking silt and water, and the lithium grease butter is fully coated in the two-wing type soil-sand seal 3.
See fig. 6, the second sealing structure includes a protecting cover 6, an L-shaped seal 7, a rubber sealing gasket 8, an O-ring 9, a gland 10, a front shield soil and sand sealing seat 11, two pressing rings 12, and three soil and sand seals 13, wherein:
the protection cover 6 is fixed on the shield soil sand sealing seat 11 in front of the shield machine by screws, the rubber sealing gasket 8 is arranged at the joint surface of the two, so that sediment and water in a soil bin can be prevented from entering the protection cover 6, the L-shaped sealing 7 is installed on the protection cover 6, the section of the L-shaped sealing 7 is in an inverted L shape, a circle of intermittent opening is formed in an inner hole close to the L-shaped sealing (see fig. 7 and 8), when the shield machine is in a non-working state, the L-shaped sealing opening is automatically closed under the action of water and soil pressure, sediment and water in the soil bin can be prevented from invading a second sealing structure area, and when the shield machine is in a working and running state, the L-shaped sealing is opened under the pressure of lubricating grease, the lubricating grease can overflow to the soil bin, and the L-shaped sealing has a one-way valve function.
Three soil and sand seals 13 are arranged in the front shield soil and sand seal seat 11, and the section of each soil and sand seal 13 is in a lip shape; the front end of each path of soil and sand seal is provided with the gland 10 or the pressure ring 12, and when the shield machine works, concentrated lubricating grease is injected into the front end of the soil and sand seal 13 through the gland 10 or the pressure ring 12 to form a grease cavity, and the grease cavity and the three paths of soil and sand seals 13 form a partition barrier together for sediment and water in the soil bin.
The gland 10 and the two pressure rings 12 are used for compressing three soil and sand seals 13.
The O-shaped ring 9 at the gland 10 is used for preventing sediment and water in the soil and sand seal oil cavity at the leftmost side of the second sealing structure.
Comparative example:
the shield machine is applied to Japanese Mitsubishi and Dan Chuandao shield machines for subway tunnel construction in the Shanghai region of China in the early year and domestic shield machines which are designed and produced by adopting the Japanese shield machine technology later, and has higher coaxiality requirements on the central axis of the center rotary joint and the central axis of the cutter head; however, as the construction conditions of the subway tunnel are developed to deeper soil layers, more complicated geology and environment and more difficult construction conditions are developed, the inadaptability of the structure of the cutter head of the shield tunneling machine and the transition section of the center rotary joint is highlighted.
FIG. 9 is a schematic diagram of a transition section of a central rotary joint of a domestic shield machine designed by adopting the Mitsubishi shield machine technology in Japan. The cause of the damage to the transition section of the central knuckle is described as follows:
the cutter head of the shield machine rotates to work in the tunneling process of the shield machine; the hydraulic fluid integrated block is connected with the cutterhead and is positioned at the center of the rear end of the cutterhead of the shield tunneling machine; the front flange of the transition section connecting shaft 14 is connected with the hydraulic fluid integrated block through screws, and the rear end of the transition section connecting shaft is connected with the central rotary joint rotary body; the shield floating support seat 16 of the shield machine is non-rotating; the floating sleeve 18 is sleeved on the transition section connecting shaft 14, and three floating support soil and sand seals 17 are arranged on the floating sleeve 18 and used for preventing sediment and water in a soil bin from entering the shield body; the center rotary joint rotating body passively rotates along with the rotation of the cutterhead and is positioned in the center rotary joint shell; the central swivel joint shell is not rotated and can only swing slightly and is positioned in the shield body.
The cutter head and center rotary joint transition section structure of the Japanese Mitsubishi shield tunneling machine technology of FIG. 9 has the following working principle: in the rotating process of the cutterhead, the rotating torque is transmitted to the hydraulic fluid integrated block, then, the hydraulic fluid integrated block is transmitted to the transition section connecting shaft 14 and the central rotary joint rotating body, the central rotary joint rotating body rotates along with the rotation of the cutterhead, the cutterhead is also transmitted to the central rotary joint under the influence of unbalanced stress, impact and local elastic deformation when the cutterhead transmits the rotating torque power, the floating sleeve 18 has a maximum radial floating gap of 20mm in the shield machine front shield floating support seat 16, the structure is simply called floating support, the floating support is a soft connection, and the jumping influence brought by the cutterhead is digested through the radial gap between the floating sleeve 6 and the front shield floating support seat 16.
On the surface, the floating support can cope with radial runout < = ±10mm of the central rotary joint caused by the cutter head, in fact, the design of the floating support structure has great limitation, the cutter head drives the central rotary joint rotating body to rotate and simultaneously drives the transition section connecting shaft 14, the central rotary joint rotating body and the central rotary joint shell of the central rotary joint to swing, instead of simple radial runout, the swing can be dealt with by providing proper fit clearances in the directions of various degrees of freedom, the biggest problem of the floating support is that only radial floating can be realized, three floating support soil and sand seals are arranged between the floating sleeve 18 and the transition section connecting shaft 14, and proper fit clearances cannot be provided in the directions of various degrees of freedom, and the limitation of the design of the floating support structure is that the soil and sand seals are designed in the structure of soft connection, so that the functions and functions of the soft connection are limited; because of the design limitation of the floating support, the allowable runout value is only +/-3 mm, and the actual measurement shows that the maximum runout of the central rotary joint can only reach +/-7 mm, and once the runout exceeds the runout value, the transition section of the central rotary joint is damaged, so that the current construction requirement cannot be met.
Comparative analysis and effect verification:
the technical scheme of the utility model can completely overcome the limitation of the traditional shield tunneling machine in the comparative example. The technical scheme of the utility model is that the soft connection and the soil and sand sealing system are separated, so that the functions of the soft connection and the soil and sand sealing system are fully exerted.
The utility model has unique and ingenious structural design, greatly improves the adaptability of the transition section structure of the central rotary joint of the earth pressure balance shield machine, reduces the fault risk of the central rotary joint, further ensures the use safety of shield machine equipment, and simultaneously reduces the consumption of concentrated lubricating grease of the shield machine due to the L-shaped seal with the one-way valve function, thereby having good economy. The transition section structure of the central rotary joint has been applied to earth pressure balance shield machines and has received good expected effects.
The above description is merely illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any alterations or modifications of the above disclosed technology by those of ordinary skill in the art should be considered equivalent and valid embodiments, which fall within the scope of the present application.
Claims (5)
1. The utility model provides a novel changeover portion structure of earth pressure balance shield machine center rotary joint, its characterized in that includes two semi-ring pipeline drum (1), biography power piece (4), changeover portion hollow shaft (5), and clamp plate (2), two wing formula soil sand seals (3), protective cover (6), L shape seal (7), rubber seal pad (8), O shape circle (9), gland (10), preceding shield soil sand seal seat (11), twice clamping ring (12), three soil sand seals (13):
the two semi-ring pipeline cylinders (1), the force transmission block (4) and the transition section hollow shaft (5) form a composite flexible connection which is used as a force transmission mechanism for transmitting rotation torque;
the device comprises a pressing plate (2), two wing type soil and sand seals (3), a protective cover (6), an L-shaped seal (7), a rubber sealing gasket (8), an O-shaped ring (9), a pressing cover (10), a front shield soil and sand sealing seat (11), two pressing rings (12) and three soil and sand seals (13) to form a soil and sand sealing system.
2. The novel transition section structure of the central rotary joint of the earth pressure balance shield machine according to claim 1, wherein the two half-ring pipeline cylinders (1) are connected with the hydraulic fluid integrated block through the front end flange thereof by screws, and the rear end thereof is provided with a shearing-resistant slot which is connected with the force transmission block (4) by screws; the transition section hollow shaft (5) is provided with a force transmission groove, the force transmission block (4) is matched with the force transmission groove, and proper fit clearances are arranged between the force transmission block (4) and the force transmission groove in the directions of the degrees of freedom, so that the jumping influence caused by the cutter disc can be digested in the directions of the degrees of freedom.
3. The novel transition section structure of the central rotary joint of the earth pressure balance shield machine according to claim 1, wherein the earth and sand sealing system comprises a first sealing structure and a second sealing structure, the first sealing structure is used for preventing earth bin sediment and water from entering the two semi-ring pipeline cylinders (1), and the second sealing structure is used for preventing earth bin sediment and water from entering the shield body of the shield machine.
4. The novel transition section structure of the earth pressure balance shield machine center rotary joint according to claim 3, wherein the first sealing structure comprises a pressing plate (2), two-wing type earth sand seals (3) and lithium-based grease, the pressing plate (2) and the two-wing type earth sand seals (3) are fixed on a transition section hollow shaft (5) by screws, the two-wing type earth sand seals (3) are located between the transition section hollow shaft (5) and the two semi-ring pipeline cylinders (1) to play a role in blocking silt and water, and the lithium-based grease is coated in the two-wing type earth sand seals (3).
5. The novel transition section structure of the earth pressure balance shield machine center rotary joint according to claim 3, wherein the second sealing structure comprises a protective cover (6), an L-shaped sealing structure (7), a rubber sealing gasket (8), an O-ring (9), a gland (10), a front shield earth and sand sealing seat (11), two pressing rings (12) and three earth and sand seals (13), wherein:
the protective cover (6) is fixed on a shield soil and sand sealing seat (11) in front of the shield machine by using screws, the rubber sealing gasket (8) is arranged at the joint surface of the protective cover and the shield machine, so that sediment and water in a soil bin can be prevented from entering the protective cover (6), the L-shaped seal (7) is arranged on the protective cover (6), the cross section of the L-shaped seal is in an inverted L shape, a circle of intermittent opening is formed in the L-shaped seal near inner hole, the L-shaped seal opening is automatically closed under the action of water and soil pressure when the shield machine is in a non-working state, the sediment and water in the soil bin can be prevented from entering a second sealing structure area, the L-shaped seal is opened under the pressure of lubricating grease when the shield machine is in a working state, the lubricating grease can overflow to the soil bin, and the L-shaped seal has a one-way valve function;
three soil and sand seals (13) are arranged in the front shield soil and sand seal seat (11), and the section of each soil and sand seal (13) is in a lip shape; the front end of each path of soil-sand seal is provided with the gland (10) or the pressure ring (12), when the shield machine works, concentrated lubricating grease is injected into the front end of the soil-sand seal (13) through the gland (10) or the pressure ring (12) to form a grease cavity, and the grease cavity and the three paths of soil-sand seals (13) form a partition barrier together for sediment and water in the soil bin;
the gland (10) and the two pressing rings (12) are used for pressing three soil and sand seals (13);
an O-shaped ring (9) at the gland (10) is used for preventing sediment and water in the soil and sand in the first soil and sand sealed grease cavity at the leftmost side of the second sealing structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320175622.2U CN219262371U (en) | 2023-02-07 | 2023-02-07 | Novel transition section structure of central rotary joint of earth pressure balance shield machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320175622.2U CN219262371U (en) | 2023-02-07 | 2023-02-07 | Novel transition section structure of central rotary joint of earth pressure balance shield machine |
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| CN202320175622.2U Active CN219262371U (en) | 2023-02-07 | 2023-02-07 | Novel transition section structure of central rotary joint of earth pressure balance shield machine |
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