Shield tunneling machine hob with high sealing performance

Abstract

The utility model relates to the technical field of shield tunneling machine parts, in particular to a shield tunneling machine hobbing cutter with high sealing performance, which comprises a cutter shaft and a locking mechanism, a sealing lubrication mechanism is arranged on the surface of the cutter shaft, a cutter hub is arranged on the surface of the sealing lubrication mechanism, a cutter ring is in interference connection with the surface of the cutter hub, and the locking mechanism is arranged on the cutter ring. A threaded groove is formed in the end, facing the cutter ring, of the cutter hub, and an insertion hole communicated with the threaded groove is formed in the end, facing the cutter ring, of the cutter ring. The locking mechanism can tightly lock the cutter ring on the surface of the cutter hub and prevent the cutter ring from sliding on the surface of the cutter hub, meanwhile, the polished rod bolt can prevent the cutter ring from rotating through the inserting hole, a limiting structure does not need to be independently arranged between the cutter hub and the cutter ring, and the manufacturing cost of the cutter hub and the cutter ring is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shield machine spare part technical field, and particularly to a shield machine cutter with high sealing performance. BACKGROUND

[0002] The shield machine cutter is a key component for cutting rock and soil when the shield machine is excavating underground, and is particularly suitable for hard rock strata. The principle of rock breaking by the cutter is to rely on the impact crushing and shearing crushing effect generated by the cutter rolling to achieve the purpose of breaking rock.

[0003] At present, a shield machine cutter (authorized publication number CN220599810U) is disclosed in a Chinese patent, which comprises a cutter body, a boss and an expansion ring are arranged on the outer ring of the cutter body, a cutter ring is arranged on the outer ring of the expansion ring, the cutter ring is attached to the boss, a guide groove is formed on the outer ring of the cutter ring to form two cutting edges; a retaining ring is further arranged on the outer ring of the cutter body, one side of the retaining ring is attached to the cutter ring; a first anti-channeling piece is arranged between the expansion ring and the cutter ring, a second anti-channeling piece is arranged between the retaining ring and the cutter ring and between the boss and the cutter ring, and a plurality of counterbores are formed on the retaining ring.

[0004] Since the above-mentioned device adopts a side retaining ring to lock the cutter ring, however, the side retaining ring is fixed on the corresponding position of the cutter body through bolts parallel to the cutter ring, which requires that the manufacturing specifications of the cutter ring and the retaining ring are approximately zero tolerance. However, in actual production, considering the thermal expansion and contraction and wear of the material, high-precision machining will increase the cost, and the installation and maintenance will also be more complex, which increases the use cost of the shield machine cutter and has low practicability.

[0005] Therefore, a shield machine cutter with high sealing performance is proposed to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a shield machine cutter with high sealing performance to solve the above-mentioned problems and improve the problems of the shield machine cutter with high sealing performance.

[0007] The utility model realizes the above-mentioned purposes through the following technical scheme, a shield machine cutter with high sealing performance, comprising: a cutter shaft and a locking mechanism, the surface of the cutter shaft is provided with a sealing and lubricating mechanism, the surface of the sealing and lubricating mechanism is provided with a cutter hub, the surface of the cutter hub is connected with a cutter ring in interference, one end of the cutter hub towards the cutter ring is provided with a threaded groove, and one end of the cutter ring towards the cutter ring is provided with a plug hole in communication with the threaded groove.

[0008] The locking mechanism comprises a retaining ring sleeved on the surface of the cutter hub, a counterbore in communication with the insertion hole is formed at one end of the retaining ring away from the cutter ring, and a plain rod bolt is inserted into the counterbore.

[0009] Preferably, the threaded grooves, insertion holes, counterbores and plain rod bolts are used in pairs and the number of each is ten, and the threaded grooves, insertion holes, counterbores and plain rod bolts are annularly distributed around the axis of the cutter shaft.

[0010] Preferably, ten installation cavities in communication with the adjacent counterbores are formed in the retaining ring, a positioning groove is formed in the head of the plain rod bolt, and the locking mechanism further comprises ten anti-loosening assemblies, each of which comprises an anti-extraction block inserted into the positioning groove, one end of the anti-extraction block away from the positioning groove penetrates into the installation cavity and is in sliding connection with the installation cavity, and a spring always in a compressed state is arranged between the anti-extraction block and the installation cavity.

[0011] Preferably, the cross-sectional shape of the anti-extraction block is a right trapezoid, and the inclined surface of the anti-extraction block is away from the insertion hole.

[0012] Preferably, the positioning groove is square-shaped, and the vertical inner wall of the positioning groove is in close contact with the vertical surface of the anti-extraction block.

[0013] Preferably, one end of the anti-extraction block away from the positioning groove is fixedly connected with a limiting plate in sliding connection with the installation cavity, and the cross-sectional shape of the contact part of the limiting plate with the installation cavity is rectangular.

[0014] Preferably, the cross-sectional shape of the installation cavity is convex, and the opening inner diameter of the installation cavity is smaller than the diameter of the limiting plate.

[0015] The utility model discloses the beneficial effects are:

[0016] 1. The locking mechanism can not only tightly lock the cutter ring on the surface of the cutter hub and prevent the cutter ring from sliding on the surface of the cutter hub, but also prevent the cutter ring from rotating by the insertion hole of the plain rod bolt, so that the limiting structure between the cutter hub and the cutter ring is not needed, and the manufacturing cost of the cutter hub and the cutter ring is effectively reduced.

[0017] 2. The sealing and lubricating mechanism adopts a main-vice double-sealing structure design, which can significantly improve the sealing pressure bearing capacity, and the sealing assembly adopting the modular design can be quickly replaced, effectively shortening the required time for maintenance and replacement.

[0018] 3. The anti-loosening assembly can stably lock the polished rod bolt installed in place in the counterbore, so that the cutter ring runs more stably, and when the worker needs to disassemble the polished rod bolt, the worker only needs to use a socket wrench matched with the polished rod bolt, and then nest the socket wrench in the head of the polished rod bolt, the socket wrench contacts the inclined surface of the anti-extraction block during the process of following the head of the polished rod bolt and actively extrudes the anti-extraction block out of the positioning groove, at this time the polished rod bolt loses the block, and the worker can normally disassemble the polished rod bolt. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the overall structure in the utility model;

[0020] Figure 2 It is a sectional view schematic view of the overall structure in the utility model;

[0021] Figure 3 It is Figure 2 It is an enlarged view of A in the utility model;

[0022] Figure 4 It is an explosion schematic view of the overall structure in the utility model.

[0023] In the figure: 100, cutter shaft; 200, sealing and lubricating mechanism; 300, cutter hub; 310, threaded groove; 400, cutter ring; 410, insertion hole; 500, locking mechanism; 510, check ring; 511, counterbore; 512, installation cavity; 520, polished rod bolt; 521, positioning groove; 530, anti-loosening assembly; 531, anti-extraction block; 532, spring; 533, limiting plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] In specific implementation: such as Figures 1-4As shown, a shield tunneling machine cutter with high sealing performance comprises a cutter shaft 100 and a locking mechanism 500, the surface of the cutter shaft 100 is provided with a sealing and lubricating mechanism 200, the surface of the sealing and lubricating mechanism 200 is provided with a cutter hub 300, the surface of the cutter hub 300 is connected with a cutter ring 400 in interference fit, one end of the cutter hub 300 towards the cutter ring 400 is provided with a threaded groove 310, and one end of the cutter ring 400 towards the cutter ring 400 is provided with a plug hole 410 in communication with the threaded groove 310. It should be noted that the structure of the cutter shaft 100 is not changed, and therefore the mounting mode of the cutter shaft 100 and the corresponding part of the shield tunneling machine is the same as the existing mode, which will not be described here.

[0026] The inside of the cutter hub 300 is provided with a bearing mounting chamber, the sealing and lubricating mechanism 200 comprises a bearing set and a sealing assembly, the bearing set is composed of two sets of conical roller bearings mounted back to back, and the sealing assembly comprises a main sealing ring, a secondary sealing ring and an isolation ring. The main sealing ring adopts a stepped metal skeleton rubber composite structure, the metal skeleton is bolted to the cutter hub 300, and the rubber lip forms a 45° contact angle with the cutter shaft 100; the secondary sealing ring is a V-shaped ring made of PTFE and is installed inside the main sealing ring; the isolation ring is a stainless steel ring and is fixed to the shoulder of the cutter shaft 100 by a snap spring, and forms a 0.1mm gap with the secondary sealing ring. The design of the main and secondary sealing structure can increase the sealing pressure bearing capacity to 6MPa, which is 300% higher than the traditional lip seal.

[0027] The main sealing ring metal skeleton is made of 40Cr alloy steel and is quenched and tempered, with a hardness of HRC28-32; the rubber material is hydrogenated nitrile rubber (HNBR), with a Shore hardness of 80±5; the secondary sealing ring is made of PTFE filled with 25% glass fiber, and the wear resistance of the PTFE secondary sealing ring is more than 5 times that of ordinary rubber, with a service life of at least 2000 hours under normal use; the isolation ring is made of 06Cr19Ni10 stainless steel.

[0028] Working process and main principle: during operation, the rubber lip of the main sealing ring is tightly attached to the cutter shaft 100 under the action of oil pressure, forming the first dynamic seal; the secondary sealing ring compensates for the axial displacement through elastic deformation, and forms a non-contact labyrinth seal with the isolation ring; when the main sealing ring fails, the secondary sealing ring can independently prevent contaminants from entering the bearing cavity.

[0029] Operation steps and matters needing attention:

[0030] S1: press-fit the bearing set into the inner cavity of the cutter hub 300, and inject lubricating grease to 80% of the volume;

[0031] S2: install the isolation ring (fixed by a snap spring) and the secondary sealing ring (note that the opening direction is towards the bearing side) in sequence;

[0032] S3: Fasten the main sealing ring metal skeleton to the end face of the cutter hub 300 with M8 internal hexagonal screws, and tighten the torque to 12 N·m;

[0033] S4: Before installing the cutter ring 400, it needs to be cooled to -50℃ with liquid nitrogen to ensure the interference amount.

[0034] Replaceable component: The secondary sealing ring can be replaced by a three-segment split ring made of polyether ether ketone (PEEK).

[0035] Other scheme: The optimized scheme uses a double-metal bellows mechanical seal instead of a rubber sealing assembly. One end of the bellows is welded to the cutter hub 300, and the other end forms an end face seal with a silicon carbide dynamic ring and a hard alloy static ring on the cutter shaft 100. It is suitable for ultra-high pressure (ultra-high pressure requires more than 10 MPa) working conditions. The modular design of the sealing assembly can realize quick replacement, and the maintenance time is shortened by 70%.

[0036] As shown in Figure 2 , Figure 3 and Figure 4 , the locking mechanism 500 includes a check ring 510 fitted on the surface of the cutter hub 300. One end of the check ring 510, which faces away from the cutter ring 400, is provided with a counterbore 511 that communicates with the insertion hole 410. A light rod bolt 520 is inserted into the counterbore 511. The rod portion of the light rod bolt 520 successively penetrates the counterbore 511, the insertion hole 410, and is threadedly connected with the threaded groove 310. The threaded groove 310, the insertion hole 410, the counterbore 511, and the light rod bolt 520 are used in combination and the number of each is ten. The threaded groove 310, the insertion hole 410, the counterbore 511, and the light rod bolt 520 are distributed in a ring shape around the axis of the cutter shaft 100.

[0037] As shown in Figure 3 and Figure 4 , the inside of the check ring 510 is provided with ten installation cavities 512 that respectively communicate with adjacent counterbores 511. The head portion of the light rod bolt 520 is provided with a positioning groove 521. The locking mechanism 500 further includes ten anti-loosening assemblies 530. The anti-loosening assembly 530 includes an anti-escape block 531 that is inserted into the positioning groove 521. One end of the anti-escape block 531, which faces away from the positioning groove 521, penetrates into the installation cavity 512 and is slidably connected with the installation cavity 512. A spring 532 that is always in a compressed state is arranged between the anti-escape block 531 and the installation cavity 512. The cross-sectional shape of the anti-escape block 531 is a right trapezoidal shape, and the inclined surface of the anti-escape block 531 faces away from the insertion hole 410. The positioning groove 521 is square in shape, and the vertical inner wall of the positioning groove 521 is in close contact with the vertical surface of the anti-escape block 531. One end of the anti-escape block 531, which faces away from the positioning groove 521, is fixedly connected with a limiting plate 533 that is slidably connected with the installation cavity 512. The cross-sectional shape of the contact part of the limiting plate 533 with the installation cavity 512 is rectangular. The cross-sectional shape of the installation cavity 512 is convex, and the opening inner diameter of the installation cavity 512 is smaller than the diameter of the limiting plate 533.

[0038] In the process that the staff adjusts the head of the polished rod bolt 520 to the inside of the counterbore 511, the head of the polished rod bolt 520 will be in advance with the inclined surface of the anti-extraction block 531, and in the process that the head of the polished rod bolt 520 is subsequently deepened into the counterbore 511, the head of the polished rod bolt 520 will extrude the anti-extraction block 531 to the inside of the mounting cavity 512, and when the polished rod bolt 520 is installed in place in the counterbore 511, the anti-extraction block 531 is just aligned with the positioning groove 521 at this time, and the spring 532 will push the anti-extraction block 531 out of the mounting cavity 512 and be clamped together with the positioning groove 521 at this time, and in the subsequent operation of the tunneling machine cutter, the blocking ring 510 prevents the polished rod bolt 520 from loosening through the mounting cavity 512, the anti-extraction block 531 and the positioning groove 521, so that the cutter ring 400 runs more stably.

[0039] When the staff needs to disassemble the polished rod bolt 520, the staff only needs to select a socket wrench matched with the polished rod bolt 520, and then nest the socket wrench in the head of the polished rod bolt 520, and the socket wrench contacts the inclined surface of the anti-extraction block 531 and actively extrudes the anti-extraction block 531 out of the positioning groove 521 in the process of following the head of the polished rod bolt 520, at this time the polished rod bolt 520 loses the block, and the staff can normally disassemble the polished rod bolt 520.

[0040] In use, in the process that the cutter ring 400 is in interference connection with the cutter hub 300, the staff needs to align the threaded groove 310 and the insertion hole 410 together, then the blocking ring 510 is sleeved on the surface of the cutter hub 300 and is attached together with the cutter ring 400, and the counterbore 511 is aligned with the insertion hole 410, then the polished rod bolt 520 is sequentially penetrated through the counterbore 511, the insertion hole 410 and is in threaded connection with the threaded groove 310, until the polished rod bolt 520 drives the blocking ring 510 and the cutter ring 400 to be closely attached through the counterbore 511. Compared with the existing cutter ring 400 locking structure, the locking mechanism 500 not only can tightly lock the cutter ring 400 on the surface of the cutter hub 300, prevent the cutter ring 400 from sliding on the surface of the cutter hub 300, but also can prevent the cutter ring 400 from rotating through the insertion hole 410, without separately opening a limiting structure between the cutter hub 300 and the cutter ring 400, effectively reducing the manufacturing cost of the cutter hub 300 and the cutter ring 400.

[0041] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A shield tunneling machine cutter having high sealing performance, characterized by, The utility model relates to a kind of locking mechanism of cutter hub, including: the cutter shaft (100), the surface of the cutter shaft (100) is equipped with sealing lubricating mechanism (200), the surface of the sealing lubricating mechanism (200) is equipped with cutter hub (300), the surface of the cutter hub (300) is connected with cutter ring (400) by interference;Wherein, the one end of the cutter hub (300) towards cutter ring (400) is provided with threaded groove (310), the one end of the cutter ring (400) towards cutter ring (400) is provided with insertion hole (410) with threaded groove (310) intercommunication; Locking mechanism (500), the locking mechanism (500) includes the stop ring (510) of being set on the surface of cutter hub (300), the one end of the stop ring (510) away from cutter ring (400) is provided with counterbore (511) with insertion hole (410) intercommunication, the inside of the counterbore (511) is inserted with light rod bolt (520), the stem of the light rod bolt (520) is sequentially penetrated counterbore (511), insertion hole (410) and is connected with threaded groove (310) by screw thread. The threaded groove (310), insertion hole (410), counterbore (511) and light rod bolt (520) are matched and used, and the number is ten, the threaded groove (310), insertion hole (410), counterbore (511) and light rod bolt (520) are annularly distributed around the axial line of cutter shaft (100). The inside of the stop ring (510) is provided with ten installation cavities (512) respectively with adjacent counterbore (511) intercommunication, the head of the light rod bolt (520) is provided with positioning groove (521), the locking mechanism (500) further includes ten anti-loosening assemblies (530), the anti-loosening assembly (530) includes anti-drop block (531) inserted in positioning groove (521), the one end of the anti-drop block (531) away from positioning groove (521) is penetrated into installation cavity (512) and is connected with installation cavity (512) slidingly, spring (532) that is always in compressed state is arranged between the anti-drop block (531) and installation cavity (512).

2. The TBM cutter head with high sealing performance according to claim 1, characterized in that: The section shape of the anti-drop block (531) is right trapezoidal shape, and the inclined surface of the anti-drop block (531) is away from the insertion hole (410).

3. The TBM cutter head with high sealing performance according to claim 2, characterized in that: The positioning groove (521) is square, and the vertical inner wall of the positioning groove (521) is attached to the vertical surface of the anti-drop block (531).

4. The TBM cutter head with high sealing performance according to claim 3, characterized in that: The one end of the anti-drop block (531) away from the positioning groove (521) is fixedly connected with the limiting plate (533) slidingly connected with the installation cavity (512), and the section shape of the contact part of the limiting plate (533) and the installation cavity (512) is rectangular.

5. The TBM cutter head with high sealing performance according to claim 4, characterized in that: The section shape of the installation cavity (512) is convex, and the opening inner diameter of the installation cavity (512) is less than the diameter of the limiting plate (533).

6. The TBM cutter head with high sealing performance according to claim 3, characterized in that: ​ 7. The TBM cutter head with high sealing performance according to claim 6, characterized in that: ​

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