Shield cutter eccentric driving device based on gear transmission

Abstract

The invention provides a shield cutter eccentric driving device based on gear transmission, which comprises a shield body structure, a cutter is arranged in front of the shield body structure, an eccentric driving mechanism is arranged in the shield body structure, and a central revolving body is arranged at the central position of the cutter and the shield body structure in a penetrating manner; the eccentric driving mechanism comprises a box body arranged on the outer side of the central rotary body, a central duplicate gear is arranged on the outer side of the central rotary body in the box body in a sleeving manner, the central duplicate gear comprises a first gear and a second gear which are coaxially and integrally arranged, and the first gear is arranged towards the direction of the cutter head and is meshed with an eccentric driving gear set; the second gear is arranged in a direction deviating from the cutter head and is in transmission connection with a plurality of driving assemblies; and a plurality of twisting legs are fixedly arranged between the cutter head and the eccentric driving gear set. The eccentric driving mechanism fixedly connected with the cutterhead is arranged in the shield body structure, the eccentric driving gear set is driven by the driving assembly, the cutterhead is eccentrically driven to rotate through the gears, and the transmission efficiency, the bearing capacity and the service life are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction equipment technology, and in particular to an eccentric drive device for a shield cutterhead based on gear transmission. Background Technology

[0002] In the design of shield tunneling cutterhead drive systems, gear transmission has become the mainstream transmission technology due to its high compatibility with the core requirements of shield cutterheads, such as high load, high stability, compact space, and long-term reliable operation. Currently, eccentric drives mainly employ universal joints and eccentric turntables, unlike concentric drives which use gear transmission. These transmission methods all have certain drawbacks (universal joint transmissions have low load capacity and poor precision, while eccentric turntable transmissions suffer from high contact stress, low efficiency, and short lifespan; other transmission methods also have certain defects), and none can replace the core position of gear transmission in shield tunneling cutterhead drive systems. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] To achieve the above objectives, the present invention proposes an eccentric drive device for a shield cutterhead based on gear transmission, comprising a shield structure, a cutterhead disposed in front of the shield structure, an eccentric drive mechanism disposed inside the shield structure, and a central rotating body passing through the center of the cutterhead and the shield structure. The eccentric drive mechanism includes a housing disposed outside the central rotating body. A central double gear is sleeved inside the housing outside the central rotating body. The central double gear includes a first gear and a second gear that are coaxially and integrally disposed. The first gear is disposed towards the cutter head and meshes with an eccentric drive gear set. The second gear is disposed away from the cutter head and is connected to multiple drive components. Multiple torsion legs are fixedly arranged between the cutter head and the eccentric drive gear set.

[0005] This invention provides an eccentric drive mechanism that is fixedly connected to the cutterhead within the shield structure. The drive assembly drives the eccentric drive gear set, thereby enabling the eccentric drive of the cutterhead to rotate, which ensures transmission efficiency, load-bearing capacity, and service life.

[0006] Optionally, the eccentric drive gear set includes a third gear meshing with the first gear, and the third gear is meshed with an internal and external gear on the side away from the first gear. A gear ring meshes with the outer side of the internal and external gears, and the gear ring is fixedly connected to the housing. The internal and external gears are integrally provided with a drive flange facing the cutter head, and multiple torsion legs are fixedly connected between the drive flange and the cutter head.

[0007] Furthermore, the drive assembly includes a drive motor, a reducer, and a power gear; The reducer is fixedly installed on the side of the housing away from the cutter disc, and the output end of the reducer passes through the side wall of the housing to the inside of the housing and is fixedly connected to the power gear. The power gear is meshed with the second gear; The drive motor is located on the side of the reducer away from the housing, and the output end of the drive motor is connected to the input end of the reducer.

[0008] Furthermore, the housing is provided with an eccentric ring for providing axial tunneling support force for the gear set. The eccentric ring is disposed between the first gear and the second gear, and the eccentric ring is rotatably engaged with the housing, the third gear, and the internal and external gears.

[0009] Furthermore, the eccentric ring is provided with a first receiving groove facing away from the cutter head, the eccentric ring is provided with a second receiving groove facing the position of the internal and external gears, and the eccentric ring is provided with a third receiving groove facing the position of the third gear. A first bearing is provided between the first receiving groove and the inner wall of the box body on the side away from the cutter head; A second bearing is provided between the second receiving groove and the internal and external gears; The third gear is integrally extended toward the third receiving groove and has a supporting protrusion, and a third bearing is provided between the third receiving groove and the supporting protrusion.

[0010] Furthermore, the housing is provided with a first isolation plate and a second isolation plate facing the cutter head; The first isolation plate is correspondingly disposed between the drive flange and the central rotating body, and the first isolation plate is slidably and rotatably disposed between the drive flange and the central rotating body; The second isolation plate is disposed between the drive flange and the side wall of the housing, and the second isolation plate is slidably and rotatably disposed between the drive flange and the side wall of the housing.

[0011] Furthermore, a first seal is provided between the first isolation plate and the drive flange; a second seal is provided between the second isolation plate and the drive flange; and a third seal is provided between the second isolation plate and the side wall of the housing.

[0012] Furthermore, once the central rotating body is connected to the cutter head modifier channel through the housing, the offset distance between the cutter head modifier channel and the axis of the central rotating body is the radius of the cutter head's revolution.

[0013] Furthermore, the number of teeth of each gear and gear ring satisfies the following relationship: ; in, This represents the number of teeth on the gear ring. This represents the number of teeth on the external gear of an internal gear system. This refers to the number of teeth on the internal gear of an internal gear system. This represents the number of teeth on the third gear. This represents the number of teeth on the first gear.

[0014] Furthermore, multiple drive components are centrally symmetrically distributed on the side wall of the housing opposite to the direction of the cutter head.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall internal structure of a shield cutterhead eccentric drive device based on gear transmission according to the present invention. Figure 2 This is a schematic diagram of the internal gear structure of the eccentric drive mechanism of a shield cutterhead eccentric drive device based on gear transmission according to the present invention. Figure 3 This is a front view schematic diagram of the internal gear structure of the eccentric drive mechanism of a shield cutterhead eccentric drive device based on gear transmission according to the present invention. Figure 4 This is a schematic diagram of the structure of the housing facing the cutterhead side wall of an eccentric drive mechanism of a shield cutterhead eccentric drive device based on gear transmission according to the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Shield body structure; 2. Cutterhead; 3. Eccentric drive mechanism; 31. Housing; 311. First isolation plate; 312. Second isolation plate; 313. First seal; 314. Second seal; 315. Third seal; 32. Central double gear; 321. First gear; 322. Second gear; 33. Eccentric drive gear set; 331. Third gear; 332. Internal and external gears; 333. Gear ring; 334. Drive flange; 34. Drive assembly; 341. Drive motor; 342. Reducer; 343. Power gear; 4. Central rotating body; 5. Torsion leg; 6. Eccentric ring; 61. First bearing; 62. Second bearing; 63. Third bearing; 64. First receiving groove; 65. Second receiving groove; 66. Third receiving groove; 67. Support protrusion; 7. Cutterhead improver channel. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying 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.

[0019] This invention proposes an eccentric drive device for the shield cutterhead 2 based on gear transmission, as described below. Figures 1 to 4 Please provide a detailed explanation.

[0020] An eccentric drive device for a shield cutterhead 2 based on gear transmission includes a shield structure 1, a cutterhead 2 is arranged in front of the shield structure 1, an eccentric drive mechanism 3 is arranged inside the shield structure 1, and a central rotating body 4 is arranged through the center of the cutterhead 2 and the shield structure 1. The eccentric drive mechanism 3 includes a housing 31 disposed outside the central rotating body 4. A central double gear 32 is sleeved inside the housing 31 outside the central rotating body 4. The central double gear 32 includes a first gear 321 and a second gear 322 that are coaxially and integrally disposed. The first gear 321 is disposed towards the cutter head 2 and meshes with an eccentric drive gear set 33. The second gear 322 is disposed away from the cutter head 2 and is connected to multiple drive components 34. Multiple torsion legs 5 are fixedly installed between the cutter head 2 and the eccentric drive gear set 33.

[0021] The present invention provides an eccentric drive mechanism 3 fixedly connected to the cutterhead 2 in the shield structure 1. The drive assembly 34 drives the eccentric drive gear set 33, thereby achieving the rotation of the eccentric drive cutterhead 2 through the gears, which ensures transmission efficiency, load-bearing capacity and service life.

[0022] Specifically, during operation, the drive assembly 34 drives the second gear 322 of the central double gear 32 to rotate, thereby driving the overall rotation of the central double gear 32. After the central double gear 32 rotates, the first gear 321 drives the eccentric drive gear set 33 to rotate, and the eccentric drive gear set 33 drives the cutter head 2 to rotate through the torsion leg 5.

[0023] In some embodiments, the eccentric drive gear set 33 includes a third gear 331 that meshes with the first gear 321. The third gear 331 is meshed with an internal and external gear 332 on the side away from the first gear 321. A gear ring 333 meshes with the outer side of the internal and external gear 332. The gear ring 333 is fixedly connected to the housing 31. The internal and external gears 332 are integrally provided with a drive flange 334 facing the cutter head 2, and multiple torsion legs 5 are fixedly connected between the drive flange 334 and the cutter head 2.

[0024] Specifically, the third gear 331 enables transmission between the first gear 321 and the internal and external gears 332. Due to the arrangement of the third gear 331, when the internal and external gears 332 move to the meshing position with the third gear 331, the distance between the internal and external gears 332 on the side opposite to the third gear 331 and the central rotating body 4 is less than the diameter of the third gear 331, resulting in an eccentric state for the internal and external gears 332. The internal and external gears 332 drive the torsion leg 5 to rotate eccentrically via the drive flange 334, thereby eccentrically driving the cutter head 2. This allows the cutter head 2 to achieve both revolution and rotation, thus fulfilling the eccentric drive function of the cutter head 2.

[0025] In some embodiments, the drive assembly 34 includes a drive motor 341, a reducer 342, and a power gear 343; The reducer 342 is fixedly installed on the side of the housing 31 away from the cutter head 2. The output end of the reducer 342 passes through the side wall of the housing 31 and is fixedly connected to the power gear 343 inside the housing 31. The power gear 343 is meshed with the second gear 322; The drive motor 341 is located on the side of the reducer 342 away from the housing 31, and the output end of the drive motor 341 is connected to the input end of the reducer 342.

[0026] When driven, the drive motor 341 drives the drive gear to rotate through the reducer 342. The drive gear transmits power to the second gear 322, which in turn drives the central double gear 32 to rotate. The first gear 321 rotates synchronously, transmitting power to the third gear 331. The rotation of the third gear 331 then transmits power to the internal and external gears 332. The rotation of the internal and external gears 332 transmits power to the cutter head 2 through the torsion leg 5, thus providing power for the eccentric drive of the cutter head 2.

[0027] In some embodiments, an eccentric ring 6 is provided inside the housing 31 to provide axial tunneling support force for the gear set. The eccentric ring 6 is disposed between the first gear 321 and the second gear 322, and the eccentric ring 6 is rotatably engaged with the housing 31, the third gear 331, and the internal and external gears 332. By providing the eccentric ring 6, which is rotatably engaged with the housing 31, the third gear 331, and the internal and external gears 332, axial tunneling support force can be provided for the gear set inside the housing 31.

[0028] In some embodiments, the eccentric ring 6 is provided with a first receiving groove facing away from the cutter head 2, the eccentric ring 6 is provided with a second receiving groove facing the internal and external gears 332, and the eccentric ring 6 is provided with a third receiving groove facing the third gear 331. A first bearing 61 is provided between the first receiving groove and the inner wall of the box 31 on the side away from the cutter head 2; A second bearing 62 is provided between the second receiving groove and the internal and external gears 332; The third gear 331 extends integrally toward the third receiving groove and is provided with a support protrusion. A third bearing 63 is provided between the third receiving groove and the support protrusion.

[0029] Specifically, the outer ring of the first bearing 61 is detachably and fixedly connected to the side wall of the housing 31 on the side away from the cutter head 2, and the inner ring of the first bearing 61 is detachably connected to the eccentric ring 6. The outer ring of the second bearing 62 is detachably and fixedly connected to the eccentric ring 6, and the inner ring of the second bearing 62 is detachably and fixedly connected to the internal and external gears 332. The third bearing 63 is sleeved on the outside of the support protrusion. Since the support protrusion extends into the third receiving operation, the third bearing 63 will not detach from the support protrusion in the third receiving groove. Therefore, only the outer ring of the third bearing 63 is detachably and fixedly connected to the eccentric ring 6. All of the above-mentioned detachable fixed connection methods are detachable fixed connections using bolts.

[0030] Among them, the first bearing 61, the second bearing 62 and the third bearing 63 can simultaneously achieve axial and radial constraints. Since the eccentric ring 6 rotates around the center of revolution, and since the part of the eccentric ring 6 connected to the second bearing 62 is concentric with the internal and external gears 332, the revolution of the internal and external gears 332 can be achieved through the first bearing 61. The second bearing 62 can make the internal and external gears 332 revolve around the axis while rotating itself, thereby providing axial support force for the internal and external gears 332; the axial support force is transmitted to the cutter head 2 through the internal and external gears 332, the drive flange 334, and the torsion leg 5. Since the center of the first gear 321, the outermost edge of the internal and external gears 332, and the center of revolution are always collinear during the operation of the gear set, a third bearing 63 is provided. The axis of the third bearing 63 is set on the line connecting the second bearing 62, which is furthest from the center of revolution, and the center of revolution. The third bearing 63 is concentric with the first gear 321, thereby realizing the revolution and rotation of the third gear 331.

[0031] In some embodiments, the housing 31 is provided with a first isolation plate 311 and a second isolation plate 312 facing the cutter head 2; The first isolation plate 311 is correspondingly disposed between the drive flange 334 and the central rotating body 4, and the first isolation plate 311 can slide and rotate between the drive flange 334 and the central rotating body 4. The second isolation plate 312 is disposed between the drive flange 334 and the side wall of the housing 31, and the second isolation plate 312 can slide and rotate between the drive flange 334 and the side wall of the housing 31.

[0032] The first isolation plate 311 and the second isolation plate 312 can isolate the excavation chamber from the space behind the shield body in order to maintain the set pressure.

[0033] In some embodiments, a first seal 313 is provided between the first isolation plate 311 and the drive flange 334; a second seal 314 is provided between the second isolation plate 312 and the drive flange 334; and a third seal 315 is provided between the second isolation plate 312 and the side wall of the housing 31. The first seal 313, the second seal 314, and the third seal 315 can completely seal the housing 31 towards the cutter head 2, preventing debris in the soil chamber from entering the housing 31 and affecting the internal gears and bearings. In some embodiments, once the central rotating body 4 is connected to the cutter head 2 modifier channel through the housing 31, the offset distance between the cutter head 2 modifier channel and the axis of the central rotating body 4 is the radius of revolution of the cutter head 2.

[0034] In some embodiments, to achieve correct meshing of the gears in the eccentric drive device and realize the preset function, the number of teeth of each gear and the gear ring 333 satisfies the following relationship: ; in, This represents the number of teeth on gear ring 333. The number of teeth on the external gear of the internal and external gear 332; The number of teeth on the internal gear of the internal gear 332; The number of teeth on the third gear 331; This represents the number of teeth on the first gear 321.

[0035] In some embodiments, a plurality of drive components 34 are centrally symmetrically distributed on the side wall of the housing 31 away from the cutter head 2.

[0036] 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," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A shield tunnel cutterhead eccentric drive device based on gear transmission, characterized in that, It includes a shield structure, a cutterhead is provided at the front of the shield structure, an eccentric drive mechanism is provided inside the shield structure, and a central rotating body is provided through the cutterhead at the center position of the shield structure; The eccentric drive mechanism includes a housing disposed outside the central rotating body. A central double gear is sleeved inside the housing outside the central rotating body. The central double gear includes a first gear and a second gear that are coaxially and integrally disposed. The first gear is disposed towards the cutter head and meshes with an eccentric drive gear set. The second gear is disposed away from the cutter head and is connected to multiple drive components. Multiple torsion legs are fixedly arranged between the cutter head and the eccentric drive gear set.

2. The shield cutterhead eccentric drive device based on gear transmission as described in claim 1, characterized in that, The eccentric drive gear set includes a third gear that meshes with the first gear. The third gear is connected to an internal and external gear on the side away from the first gear. A gear ring meshes with the outer side of the internal and external gears. The gear ring is fixedly connected to the housing. The internal and external gears are integrally provided with a drive flange facing the cutter head, and multiple torsion legs are fixedly connected between the drive flange and the cutter head.

3. The shield cutterhead eccentric drive device based on gear transmission as described in claim 2, characterized in that, The drive assembly includes a drive motor, a reducer, and a power gear; The reducer is fixedly installed on the side of the housing away from the cutter disc, and the output end of the reducer passes through the side wall of the housing to the inside of the housing and is fixedly connected to the power gear. The power gear is meshed with the second gear; The drive motor is located on the side of the reducer away from the housing, and the output end of the drive motor is connected to the input end of the reducer.

4. The shield cutterhead eccentric drive device based on gear transmission as described in claim 1, characterized in that, The housing is provided with an eccentric ring for providing axial tunneling support force for the gear set. The eccentric ring is disposed between the first gear and the second gear, and the eccentric ring is rotatably engaged with the housing, the third gear, and the internal and external gears.

5. The shield cutterhead eccentric drive device based on gear transmission as described in claim 4, characterized in that, The eccentric ring is provided with a first receiving groove facing away from the cutter head, the eccentric ring is provided with a second receiving groove facing the position of the internal and external gears, and the eccentric ring is provided with a third receiving groove facing the position of the third gear. A first bearing is provided between the first receiving groove and the inner wall of the box body on the side away from the cutter head; A second bearing is provided between the second receiving groove and the internal and external gears; The third gear is integrally extended toward the third receiving groove and has a supporting protrusion, and a third bearing is provided between the third receiving groove and the supporting protrusion.

6. The shield cutterhead eccentric drive device based on gear transmission as described in claim 2, characterized in that, The housing is provided with a first isolation plate and a second isolation plate facing the cutter head; The first isolation plate is correspondingly disposed between the drive flange and the central rotating body, and the first isolation plate is slidably and rotatably disposed between the drive flange and the central rotating body; The second isolation plate is disposed between the drive flange and the side wall of the housing, and the second isolation plate is slidably and rotatably disposed between the drive flange and the side wall of the housing.

7. The shield cutterhead eccentric drive device based on gear transmission as described in claim 6, characterized in that, A first seal is provided between the first isolation plate and the drive flange; a second seal is provided between the second isolation plate and the drive flange; and a third seal is provided between the second isolation plate and the side wall of the housing.

8. The shield cutterhead eccentric drive device based on gear transmission as described in claim 1, characterized in that, Once the central rotating body is connected to the cutter head modifier channel through the housing, the offset distance between the cutter head modifier channel and the axis of the central rotating body is the radius of the cutter head's revolution.

9. The shield cutterhead eccentric drive device based on gear transmission as described in claim 3, characterized in that, The number of teeth of each gear and gear ring satisfies the following relationship: ； in, This represents the number of teeth on the gear ring. This represents the number of teeth on the external gear of an internal gear system. This refers to the number of teeth on the internal gear of an internal gear system. This represents the number of teeth on the third gear. This represents the number of teeth on the first gear.

10. The shield cutterhead eccentric drive device based on gear transmission as described in claim 1, characterized in that, Multiple drive components are centrally symmetrically distributed on the side wall of the housing opposite to the cutter head.

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