A mainframe sinking shaft boring machine milling assembly

Abstract

The application provides a host sinking type shaft tunneling machine milling assembly, which comprises a driving assembly, a supporting assembly, a sealing assembly, a milling roller, a cutting tooth and a shovel tooth; the left and right ends of the milling roller are provided with mounting grooves, a plurality of groups of the cutting tooth and the shovel tooth are symmetrically and staggeredly distributed on the outer side of the milling roller; two groups of the same driving assembly, the supporting assembly and the sealing assembly are symmetrically mounted in the mounting grooves at the left and right ends of the milling roller, wherein the driving assembly is arranged at the inner bottom side of the mounting groove, the supporting assembly is arranged between the driving assembly and the mounting groove around the driving assembly, and the sealing assembly is arranged in the gap between the driving assembly and the supporting assembly. The cutting tooth and the shovel tooth of the application are both provided with tungsten carbide cutting heads, the milling roller is designed in a waist drum type, the milling head is driven by variable displacement double motors, the pulling tool changing technology is adopted, the tool can be quickly changed, and the combined sealing assembly can adapt to the complex muddy water environment.

Description

Technical Field

[0001] This invention relates to a milling assembly for a main unit sinking vertical shaft tunneling machine, belonging to the field of engineering machinery technology. Background Technology

[0002] With the construction of underground parking garages, the main type of submerged shaft excavation equipment has emerged. Submerged shaft excavation equipment consists of two main components: shaft excavation equipment and settling equipment. The shaft excavation equipment is hoisted inside the launching shaft structure and is firmly attached to the shaft wall by three robotic arms. A rotating milling assembly is mounted on one of the telescopic arms, equipped with cutting cutters and cutting tools. The milling assembly excavates the soil at the bottom of the shaft, and its telescopic nature allows it to perform upward, downward, and rotational movements to complete the excavation of the entire shaft cross-section.

[0003] The milling assembly is a crucial core component of the entire tunneling equipment, primarily consisting of a high-torque motor, support bearings, milling drum, cutting cutters, cutting tools, and a combined sealing assembly. Currently, existing milling assemblies in China can only be used for excavation operations on roads or in mining tunnels, and cannot operate in deep-water environments, especially in muddy conditions at depths of hundreds of meters. Furthermore, existing milling assemblies suffer from low cutting efficiency and severe tool wear when cutting hard rock formations. In underwater operations, the tools corrode severely after a period of use, making disassembly and tool replacement extremely difficult. Since milling assemblies typically operate in muddy water at depths of around 100 meters, the watertightness requirements for the drive system are extremely high. If the seals are breached by muddy water, the entire drive system will be damaged. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the operation of existing shaft tunneling equipment, and to propose a main unit sinking type shaft tunneling machine milling assembly that can meet the requirements of operation in complex muddy water environment at a depth of 100 meters, while also meeting the cutting shape requirements of cylindrical shafts.

[0005] The technical solution of the present invention: a milling assembly for a main unit sinking vertical shaft tunneling machine, the structure of which includes a drive assembly, a support assembly, a sealing assembly, a milling drum, cutting teeth, and a shovel; the milling drum is a waist drum shape with a wall thickness of 140mm, and mounting grooves are provided at both ends of the left and right sides, and several sets of cutting teeth and shovels are symmetrically and alternately distributed on the outer side of the milling drum; two identical sets of drive assemblies, support assemblies, and sealing assemblies are symmetrically installed in the mounting grooves at both ends of the milling drum, wherein the drive assembly is located inside the bottom side of the mounting groove, the support assembly is located around the drive assembly between the drive assembly and the mounting groove, and the sealing assembly is located in the gap between the drive assembly and the support assembly.

[0006] Furthermore, the drive assembly includes a high-torque half-motor, a connecting splined shaft, an axial retaining ring, a motor mounting flange, a connecting flange, and a cylindrical roller bearing; wherein the high-torque half-motor is mounted on one end of the connecting splined shaft via the motor mounting flange, the motor mounting flange is located at the bottom of the high-torque half-motor, the connecting splined shaft passes through the central through hole of the motor mounting flange and connects to the power unit of the high-torque half-motor, and the cylindrical roller bearing is located in the gap between the connecting splined shaft and the motor mounting flange; the other end of the connecting splined shaft is mounted on the bottom center of the mounting groove of the milling drum via the connecting flange, and the axial retaining ring is mounted at the junction of the connecting splined shaft and the high-torque half-motor.

[0007] Furthermore, the support assembly includes a bearing locating ring, a support shaft assembly, and a full complement cylindrical roller bearing; wherein the support shaft assembly is arranged around the outside of the high-torque half motor, and its inner bottom is connected to the motor mounting flange by screws; the full complement cylindrical roller bearing is located between the outside of the support shaft assembly and the side wall of the mounting groove of the milling drum, the bearing locating ring is tightly attached to the full complement cylindrical roller bearing, and is installed at the bottom of the support shaft assembly by screws.

[0008] Furthermore, the sealing assembly includes a sand sealing retaining ring, a sand seal, a sealing mounting base, and a sand sealing gland; wherein the sealing mounting base is installed on the top of the milling drum mounting groove by screws and is arranged around the outside of the support shaft assembly; the sand seal is located in the gap between the sealing mounting base and the support shaft assembly; the sand sealing retaining ring is located at the bottom of the sand seal; and the sand sealing gland is located at the top of the sand seal.

[0009] Furthermore, both the cutting blade and the scraper are made of tungsten carbide cutting tips, and a laser-coated area is provided at the junction with the cutting tips.

[0010] Compared with the prior art, the advantages of the present invention are as follows:

[0011] 1) Both the cutting cutter and the scraper use tungsten carbide cutting heads, and there is a laser-coated area at the junction with the cutting head to form a full circle of wear-resistant material, which effectively extends the service life of the cutting head and enhances the milling capability;

[0012] 2) The milling drum adopts a 140mm thick waist drum-shaped welded structure, which increases the strength of the drum by more than 60% compared with the cast drum. At the same time, the welding performance between the tool holder and the drum is better than that of the cast structure, and the tool is more stable on the drum and is not easy to fall off.

[0013] 3) The pull-out tool changing technology uses hydraulic calipers to clamp the annular groove at the front of the cutting tool head, and uses the pulling force of the hydraulic push rod to pull the tool out of the tool holder. This tool changing technology is more than twice as efficient as the traditional knock-out tool changing technology.

[0014] 4) During tunneling, the maximum milling width reaches 1.6 meters, the maximum milling depth reaches 220 mm, and the feed speed at the maximum cutting depth reaches 2.6 m / min. It can handle soft soil layers and also rock formations with a strength of 80~120 MPa.

[0015] 5) The combined sealing components can adapt to complex muddy and water environments, withstand pressure greater than 1.5 MPa, and have a linear velocity greater than 4 m / s;

[0016] 6) The milling head is driven by a variable displacement dual motor, with the drive unit output speed reaching 0~85rpm and the maximum output torque reaching 82kN.m. Because it uses a variable displacement motor, the speed range of 0~85rpm can be achieved by adjusting the motor displacement. The speed range is more than 1.5 times wider than that of ordinary milling heads, which can meet the needs of excavation in various strata. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the milling assembly of the main unit of the sinking vertical shaft tunneling machine of the present invention.

[0018] Appendix Figure 2 This is a cross-sectional view of the milling assembly of the main unit of the sinking vertical shaft tunneling machine of the present invention.

[0019] Appendix Figure 3 It is attached Figure 2 A magnified view of part I in the middle.

[0020] Appendix Figure 4 This is a schematic diagram of the structure of a shovel and a cutting tooth.

[0021] In the diagram, 1 is a high-torque half motor, 2 is a connecting spline shaft, 3 is an axial retaining ring, 4 is a motor mounting flange, 5 is a connecting flange, 6 is a milling drum, 7 is a cutting cutter, 8 is a scraper, 9 is a bearing positioning ring, 10 is a support shaft assembly, 11 is a sand seal retaining ring, 12 is a sand seal, 13 is a seal mounting seat, 14 is a sand seal gland, B1 is a cylindrical roller bearing, and B2 is a full complement cylindrical roller bearing. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first" and "second," indicating order, are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] like Figures 1-2The milling assembly of the main unit sinking shaft tunneling machine shown includes a drive assembly, a support assembly, a sealing assembly, a milling drum 6, cutting teeth 7, and shovels 8. The milling drum 6 is a waist drum shape with a wall thickness of 140mm and mounting grooves at both ends. Several sets of cutting teeth 7 and shovels 8 are symmetrically and alternately distributed on the outer side of the milling drum 6. Two identical drive assemblies, support assemblies, and sealing assemblies are symmetrically installed in the mounting grooves at both ends of the milling drum 6. The drive assembly is located inside the bottom side of the mounting groove, the support assembly is located around the drive assembly between the drive assembly and the mounting groove, and the sealing assembly is located in the gap between the drive assembly and the support assembly.

[0027] The drive assembly includes a high-torque half-motor 1, a connecting splined shaft 2, an axial retaining ring 3, a motor mounting flange 4, a connecting flange 5, and a cylindrical roller bearing B1. The high-torque half-motor 1 is mounted on one end of the connecting splined shaft 2 via the motor mounting flange 4. Specifically, the motor mounting flange 4 is located at the bottom of the high-torque half-motor 1, and the connecting splined shaft 2 passes through the central through-hole of the motor mounting flange 4 to connect with the power unit of the high-torque half-motor 1. The cylindrical roller bearing B1 is located in the gap between the connecting splined shaft 2 and the motor mounting flange 4, allowing the connecting splined shaft 2 to rotate within the central through-hole of the motor mounting flange 4. The other end of the connecting splined shaft 2 is mounted on the bottom center of the mounting groove of the milling drum 6 via the connecting flange 5, and the axial retaining ring 3 is installed at the junction of the connecting splined shaft 2 and the high-torque half-motor 1.

[0028] The support assembly includes a bearing locating ring 9, a support shaft assembly 10, and a full complement cylindrical roller bearing B2; wherein the support shaft assembly 10 is arranged around the outside of the high torque half motor 1, and its inner bottom is connected to the motor mounting flange 4 by screws; the full complement cylindrical roller bearing B2 is located between the outside of the support shaft assembly 10 and the side wall of the mounting groove of the milling drum 6, and the bearing locating ring 9 is tightly attached to the full complement cylindrical roller bearing B2 and is installed at the bottom of the support shaft assembly 10 by screws.

[0029] The sealing assembly includes a sand sealing retainer ring 11, a sand seal 12, a sealing mounting base 13, and a sand sealing gland 14; wherein the sealing mounting base 13 is installed on the top of the milling drum 6 mounting groove by screws and is arranged around the outside of the support shaft assembly 10, the sand seal 12 is disposed in the gap between the sealing mounting base 13 and the support shaft assembly 10, the sand sealing retainer ring 11 is disposed at the bottom of the sand seal 12, and the sand sealing gland 14 is disposed at the top of the sand seal 12.

[0030] Figure 3This is a schematic diagram of a high-temperature hydrolytic polyurethane combined sealing system. To meet the watertightness requirements of the drive system in a muddy environment at a depth of 100 meters, a multi-stage polyurethane combined sealing system is used. In the diagram, chamber CV1 is filled with HBW high-viscosity grease supplied by a grease pump. The grease injection pressure is higher than the external muddy water pressure, ensuring the grease flows to the external muddy water medium. Chamber CV2 is filled with EP1 grease supplied by a grease pump. The injection pressure is higher than that of chamber CV1, thus forcing the grease out from the first sealing lip for lubrication and seal support. Chamber CV3 is a test chamber. Compressed air mixed with No. 68 hydraulic oil is injected into this chamber periodically for flushing. If the flushing gas carries out muddy water-like media, it indicates that the first two seals are damaged. The machine should be stopped immediately for inspection and seal replacement to prevent further damage to the drive system.

[0031] like Figure 4 As shown, both the cutting tooth 7 and the scraper 8 use tungsten carbide cutting heads, and a laser-coated area is provided at the junction with the cutting head to form a full circle of wear-resistant material. The cutting tooth head has an annular groove at the front.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A milling assembly for a main unit sinking vertical shaft tunneling machine, comprising a drive assembly, a support assembly, a sealing assembly, a milling drum (6), a cutting cutter (7), and a shovel (8); characterized in that: The milling drum (6) is waist-shaped with a wall thickness of 140mm. It has mounting grooves at both ends. Several sets of cutting teeth (7) and scrapers (8) are symmetrically and alternately distributed on the outer side of the milling drum (6). Two sets of identical drive components, support components and sealing components are symmetrically installed in the mounting grooves at both ends of the milling drum (6). The drive components are located inside the bottom side of the mounting groove, the support components are located around the drive components between the drive components and the mounting groove, and the sealing components are located in the gap between the drive components and the support components. The drive assembly includes a high-torque half motor (1), a connecting spline shaft (2), an axial retaining ring (3), a motor mounting flange (4), a connecting flange (5), and a cylindrical roller bearing (B1); wherein the high-torque half motor (1) is mounted on one end of the connecting spline shaft (2) through the motor mounting flange (4), the motor mounting flange (4) is located at the bottom of the high-torque half motor (1), the connecting spline shaft (2) passes through the central through hole of the motor mounting flange (4) and is connected to the power unit of the high-torque half motor (1), and the cylindrical roller bearing (B1) is located in the gap between the connecting spline shaft (2) and the motor mounting flange (4); the other end of the connecting spline shaft (2) is mounted on the bottom center of the mounting groove of the milling drum (6) through the connecting flange (5), and the axial retaining ring (3) is mounted at the junction of the connecting spline shaft (2) and the high-torque half motor (1); The sealing assembly includes a sand sealing retainer ring (11), a sand seal (12), a sealing mounting seat (13), and a sand sealing gland (14); wherein the sealing mounting seat (13) is installed on the top of the milling drum (6) mounting groove by screws and is arranged around the outside of the support shaft assembly (10); the sand seal (12) is located in the gap between the sealing mounting seat (13) and the support shaft assembly (10); the sand sealing retainer ring (11) is located at the bottom of the sand seal (12); and the sand sealing gland (14) is located at the top of the sand seal (12).

2. The milling assembly of a main unit sinking vertical shaft tunneling machine according to claim 1, characterized in that: The support assembly includes a bearing locating ring (9), a support shaft assembly (10), and a full complement cylindrical roller bearing (B2); wherein the support shaft assembly (10) is arranged around the outside of the high torque half motor (1), and its inner bottom is connected to the motor mounting flange (4) by screws; the full complement cylindrical roller bearing (B2) is located between the outside of the support shaft assembly (10) and the side wall of the mounting groove of the milling drum (6), the bearing locating ring (9) is close to the full complement cylindrical roller bearing (B2), and is installed at the bottom of the support shaft assembly (10) by screws.

3. The milling assembly of a main unit sinking vertical shaft tunneling machine according to claim 1, characterized in that: Both the cutting tooth cutter (7) and the scraper (8) are made of tungsten carbide cutting heads, and a laser-coated area is provided at the junction with the cutting head.

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