阅读说明：本技术 隧道掘进机主驱动橡胶-磁流体耦合密封装置及安装方法 (Tunnel boring machine main drive rubber-magnetic fluid coupling sealing device and mounting method ) 是由 霍军周 张海东 于 2020-04-30 设计创作，主要内容包括：本发明属于隧道掘进机工程技术领域,公开了一种隧道掘进机主驱动橡胶-磁流体耦合密封装置及安装方法。该装置包括掘进机转接法兰、掘进机支撑环及耦合式密封。掘进机支撑环外壁设有耐磨环。耦合式密封包括永磁体、金属极靴、磁性橡胶极齿、隔环及压环,永磁体安装于金属极靴中间,磁性橡胶极齿固定于金属极靴下方,并与掘进机支撑环接触,磁性橡胶极齿下方中间的对应掘进机支撑环及耐磨环位置设有磁流体注入孔和压力变送器,磁流体围绕于所述磁性橡胶极齿周围,共同实现旋转密封。本发明在具有密封磨损自补偿和磁流体泄漏自补偿功能的基础上,兼具零泄漏和排它性的优势,密封性能良好。(The invention belongs to the technical field of engineering of tunnel boring machines, and discloses a main drive rubber-magnetic fluid coupling sealing device of a tunnel boring machine and an installation method. The device comprises a heading machine adapter flange, a heading machine support ring and a coupling seal. And a wear-resistant ring is arranged on the outer wall of the support ring of the heading machine. The coupling seal comprises a permanent magnet, a metal pole shoe, a magnetic rubber pole tooth, a spacer ring and a pressing ring, the permanent magnet is arranged in the middle of the metal pole shoe, the magnetic rubber pole tooth is fixed below the metal pole shoe and is in contact with a support ring of the heading machine, a magnetic fluid injection hole and a pressure transmitter are arranged in the middle of the lower side of the magnetic rubber pole tooth and correspond to the support ring of the heading machine and the wear-resisting ring, and magnetic fluid surrounds the magnetic rubber pole tooth to jointly realize rotary seal. The invention has the advantages of zero leakage and exclusivity on the basis of having the functions of self-compensation of seal abrasion and self-compensation of magnetic fluid leakage, and has good sealing performance.)

1. A main drive rubber-magnetic fluid coupling sealing device of a tunnel boring machine is characterized by comprising a boring machine adapter flange (1), a boring machine support ring (2) and a coupling seal (3);

the outer wall of the support ring (2) of the development machine is provided with a wear-resistant ring (21);

the coupling seal (3) comprises a permanent magnet (31), a metal pole shoe (32), magnetic rubber pole teeth (33), a spacer ring (34) and a pressure ring (35); the permanent magnet (31) is arranged in the middle of the metal pole shoe (32), and the magnetic rubber pole teeth (33) are fixed below the metal pole shoe (32) and are in contact with the support ring (2) of the heading machine; magnetic fluid injection holes (36) and pressure transmitters (37) are respectively arranged at positions corresponding to the support ring (2) and the wear-resistant ring (21) of the heading machine in the middle below the magnetic rubber pole teeth (33), and magnetic fluid (38) surrounds the magnetic rubber pole teeth (33) to jointly realize rotary sealing; a groove (321) is formed in the outer side of the metal pole shoe (32), an O-shaped seal (322) is arranged in the groove (321), and static seal between the metal pole shoe (32) and the adapter flange (1) of the heading machine is realized; the permanent magnet (31), the metal pole shoe (32), the magnetic rubber pole tooth (33), the heading machine support ring (2) and the wear-resisting ring (21) form a closed magnetic circuit, so that the magnetic fluid (38) is ensured to be distributed around the magnetic rubber pole tooth (33), and if the magnetic rubber pole tooth (33) is worn, the magnetic fluid (38) can supplement gaps in time; the coupling seal (3) can detect the leakage condition of the magnetic fluid (38) according to the data collected by the pressure transmitter (37), and actively and additionally inject the magnetic fluid (38) into the magnetic fluid injection hole (36).

2. The tunneling machine main drive rubber-magnetic fluid coupling sealing device according to claim 1, wherein the magnetic rubber pole teeth (33) are of a double-D-shaped sealing structure, are made of rubber materials as main bodies, and are added with magnetic solid powder and a small amount of compounding ingredients.

3. The tunnelling machine main drive rubber-magnetic fluid coupling seal device according to claim 1 or 2, wherein the permanent magnet (31) is a rare earth permanent magnet.

4. The tunneling machine main drive rubber-magnetic fluid coupling sealing device according to claim 1 or 2, characterized in that the spacer ring (34) is mainly made of rubber material and is embedded with a metal framework.

5. The tunneling machine main drive rubber-magnetic fluid coupling sealing device according to claim 3, wherein the spacer ring (34) is mainly made of rubber material and is embedded with a metal framework.

6. A mounting method of a tunnel boring machine main drive rubber-magnetofluid coupling sealing device is characterized by comprising the following operation steps:

(1) cleaning a main drive seal installation cavity of the heading machine to ensure cleanness and no impurities;

(2) installing a right spacer ring (34) and installing the spacer ring to a preset position along the inner wall of the adapter flange (1) of the development machine;

(3) installing a right metal pole shoe (32) and a magnetic rubber pole tooth (33), ensuring that the metal pole shoe (32) is tightly attached to a right spacer ring (34), an O-shaped seal (322) on the outer side of the metal pole shoe (32) is tightly attached to the inner wall of the adapter flange (1) of the heading machine, and a double D-shaped seal on the inner side of the magnetic rubber pole tooth (33) is tightly attached to the outer wall of the wear-resisting ring (21);

(4) a permanent magnet (31) is arranged to ensure that the permanent magnet is tightly attached to the right metal pole shoe (32);

(5) installing a left metal pole shoe (32) and a magnetic rubber pole tooth (33) to ensure that the metal pole shoe (32) is tightly attached to the permanent magnet (31), an O-shaped seal (322) on the outer side of the metal pole shoe (32) is tightly attached to the inner wall of the adapter flange (1) of the heading machine, and a double D-shaped seal on the inner side of the magnetic rubber pole tooth (33) is tightly attached to the outer wall of the wear-resisting ring (21);

(6) a left spacer ring (34) is arranged to ensure that the left metal pole shoe (32) is tightly attached;

(7) installing a pressing ring (35) to a preset position, pressing a left spacer ring (34) tightly, and fixing the coupling sealing device 3;

(8) according to the data collected by the pressure transmitter (37), injecting magnetic fluid (38) into the magnetic fluid injection hole (36) until reaching a predetermined pressure.

Technical Field

The invention belongs to the technical field of engineering of tunnel boring machines, and particularly relates to a main drive rubber-magnetic fluid coupling sealing device of a tunnel boring machine and an installation method.

Background

With the continuous development of urban infrastructure at home and abroad, the tunnel boring machine plays a role in lifting the foot as important equipment for projects such as subway, electric power, water conservancy, mountain crossing, river crossing, submarine tunnel excavation and the like. The main drive is one of the core components of the heading machine, provides torque for the excavation of a cutter head, and bears all thrust of a propulsion system, and a sealing system of the main drive is the key for ensuring the normal work of the main drive. At present, a main driving seal mainly adopts a structural form of combining a labyrinth seal and a plurality of lip seals, and grease is continuously injected to isolate external pollutants and realize a lubricating function. In actual engineering, the influence of impact vibration, severe environment, lip seal following performance and the like often causes external silt to enter a sealing area, so that the lip seal is worn and failed at an accelerated speed, even major accidents such as main drive damage and the like occur, and great challenge is brought to smooth construction. Therefore, it is necessary to design a sealing device with good reliability, long service life and small maintenance.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the main drive rubber-magnetic fluid coupling sealing device for the tunnel boring machine, which effectively improves the sealing performance, prolongs the service life, avoids the damage of the main drive caused by the sealing failure and ensures the normal work of the tunnel boring machine.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a tunnel boring machine main drive rubber-magnetofluid coupling sealing device comprises a boring machine adapter flange 1, a boring machine support ring 2 and a coupling seal 3;

the outer wall of the support ring 2 of the development machine is provided with a wear-resisting ring 21;

the coupling seal 3 comprises a permanent magnet 31, a metal pole shoe 32, magnetic rubber pole teeth 33, a spacer ring 34 and a pressure ring 35; the permanent magnet 31 is arranged in the middle of the metal pole shoe 32, and the magnetic rubber pole teeth 33 are fixed below the metal pole shoe 32 and are in contact with the support ring 2 of the heading machine; magnetic fluid injection holes 36 and a pressure transmitter 37 are respectively arranged at the positions corresponding to the support ring 2 and the wear-resistant ring 21 of the heading machine in the middle below the magnetic rubber pole teeth 33, and magnetic fluid 38 surrounds the magnetic rubber pole teeth 33 to jointly realize rotary sealing; a groove 321 is formed in the outer side of the metal pole shoe 32, and an O-shaped seal 322 is arranged in the groove 321, so that static seal between the metal pole shoe 32 and the adapter flange 1 of the heading machine is realized; the permanent magnet 31, the metal pole shoe 32, the magnetic rubber pole teeth 33, the heading machine support ring 2 and the wear-resisting ring 21 form a closed magnetic circuit, so that the magnetic fluid 38 is ensured to be distributed around the magnetic rubber pole teeth 33, and if the magnetic rubber pole teeth 33 are worn, the magnetic fluid 38 can timely supplement gaps. The coupling seal 3 can detect the leakage condition of the magnetic fluid 38 according to the data collected by the pressure transmitter 37, and actively and additionally inject the magnetic fluid 38 into the magnetic fluid injection hole 36.

The magnetic rubber pole teeth 33 are of a double-D-shaped sealing structure.

The magnetic rubber pole teeth 33 are made of rubber materials as main bodies and magnetic solid powder and a small amount of compounding ingredients are added.

The permanent magnet 31 is a rare earth permanent magnet.

The spacer ring 34 is made of rubber material and is embedded with a metal framework.

A mounting method of a tunnel boring machine main drive rubber-magnetofluid coupling sealing device comprises the following operation steps:

(1) cleaning a main drive seal installation cavity of the heading machine to ensure cleanness and no impurities;

(2) installing a right spacer ring 34, and installing the right spacer ring to a preset position along the inner wall of the adapter flange 1 of the development machine;

(3) installing a right metal pole shoe 32 and a magnetic rubber pole tooth 33 to ensure that the metal pole shoe 32 is tightly attached to a right spacer ring 34, an O-shaped seal 322 on the outer side of the metal pole shoe 32 is tightly attached to the inner wall of the adapter flange 1 of the heading machine, and double D-shaped seals on the inner side of the magnetic rubber pole tooth 33 are tightly attached to the outer wall of the wear-resistant ring 21;

(4) a permanent magnet 31 is arranged to ensure that the permanent magnet is tightly attached to the right metal pole shoe 32;

(5) installing a left metal pole shoe 32 and a magnetic rubber pole tooth 33 to ensure that the metal pole shoe 32 is tightly attached to the permanent magnet 31, wherein an O-shaped seal 322 on the outer side of the metal pole shoe 32 is tightly attached to the inner wall of the adapter flange 1 of the heading machine, and a double D-shaped seal on the inner side of the magnetic rubber pole tooth 33 is tightly attached to the outer wall of the wear-resistant ring 21;

(6) a left spacer ring 34 is arranged to ensure that the left metal pole shoe 32 is tightly attached;

(7) installing a pressing ring 35 to a preset position, pressing the left spacer ring 34 tightly, and fixing the coupling sealing device 3;

(8) based on the data collected by the pressure transmitter 37, the magnetic fluid 38 is injected into the magnetic fluid injection hole 36 until a predetermined pressure is reached.

Preferably, in the steps (2) to (6), the installation depth is measured by a vernier caliper in each step, and the next step is performed after the preset depth is reached.

The invention has the beneficial effects that: compared with the prior art, the main drive rubber-magnetic fluid coupling sealing device and the installation method of the tunnel boring machine provided by the invention have the following advantages:

(1) the sealing device forms a closed magnetic circuit together by the permanent magnet 31, the metal pole shoe 32, the magnetic rubber pole tooth 33, the heading machine support ring 2 and the wear-resisting ring 21, the magnetic fluid 38 is distributed around the magnetic rubber pole tooth 33 due to self liquid fluidity and magnetic action, when the double D-shaped seal of the magnetic rubber pole tooth 33 is worn and generates a gap with the wear-resisting ring 21, the magnetic fluid 38 automatically fills the gap, the abrasion loss is supplemented in time, and the abrasion self-compensation function is realized.

(2) The sealing device can detect the leakage condition of the magnetic fluid 38 according to the data collected by the pressure transmitter 37, actively supplement the magnetic fluid 38 and realize the leakage self-compensation function.

(3) The sealing device effectively removes external pollutants such as silt and the like through a rubber-magnetic fluid coupling sealing mode, prevents gear oil from leaking, has the advantages of zero leakage, exclusivity, reliability, stability and the like, and ensures good sealing performance in the tunnel construction process.

(4) The sealing device does not need to use sealing grease, the problem that a large amount of sealing grease is consumed in the working process of the existing main driving sealing system of the tunnel boring machine is solved, and the construction cost is greatly reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a partially enlarged and closed magnetic circuit diagram of fig. 1.

In the figure: 1 a heading machine adapter flange, 2 a heading machine support ring, 21 a wear-resistant ring, 3 a coupling seal, 31 a permanent magnet, 32 a metal pole shoe, 321 grooves, 322O-shaped seals, 33 magnetic rubber pole teeth, 34 a spacer ring, 35 a pressure ring, 36 a magnetic fluid injection hole, 37 a pressure transmitter and 38 a magnetic fluid.

Detailed Description

The invention is described in further detail below with reference to the figures and examples.

Referring to fig. 1 and 2, the main driving rubber-magnetic fluid coupling sealing device for the tunnel boring machine comprises a boring machine adapter flange 1, a boring machine support ring 2 and a coupling seal 3. And a wear-resisting ring 21 is arranged on the outer wall of the support ring of the heading machine. The coupling seal 3 comprises a permanent magnet 31, a metal pole shoe 32, magnetic rubber pole teeth 33, a spacer ring 34 and a pressing ring 35, the permanent magnet 31 is installed in the middle of the metal pole shoe 32, the magnetic rubber pole teeth 33 are fixed below the metal pole shoe 32 and are in contact with the support ring 2 of the heading machine, injection holes 36 and a pressure transmitter 37 are arranged in the positions, corresponding to the support ring 2 of the heading machine and the wear-resisting ring 21, of the middle of the lower portion of the magnetic rubber pole teeth 33, and the magnetic fluid 38 surrounds the magnetic rubber pole teeth 33 due to self liquid fluidity and magnetic action to jointly realize rotary seal. In order to prevent external silt from penetrating through the contact surface between the metal pole shoe 32 and the heading machine adapter flange 1 and further polluting gear oil, a groove 321 is formed in the outer side of the metal pole shoe 32, and an O-shaped seal 322 is arranged in the groove 321, so that static sealing between the metal pole shoe 32 and the heading machine adapter flange 1 is realized.

Preferably, referring to fig. 2, the permanent magnet 31, the metal pole shoe 32, the magnetic rubber tooth 33 and the support ring 2 of the heading machine form a closed magnetic circuit, so that the magnetic fluid 38 is distributed around the magnetic rubber tooth 33, and if the magnetic rubber tooth 33 is worn, the magnetic fluid 38 can timely supplement gaps.

Preferably, the coupled seal 3 can detect the leakage of the magnetic fluid 38 according to the data collected by the pressure transmitter 37, and actively supplement the magnetic fluid 38 into the magnetic fluid injection hole 36 until the pressure reaches a predetermined value.

Preferably, the magnetic rubber pole teeth 33 are double D-shaped sealing structures.

Preferably, the magnetic rubber pole teeth 33 are made of rubber materials as main bodies, and magnetic solid powder and a small amount of compounding ingredients are added.

Preferably, the permanent magnet 31 is a rare earth permanent magnet.

Preferably, the spacer ring 34 is made of rubber material and embedded with a metal framework.

The invention also provides an installation method of the tunnel boring machine main drive rubber-magnetic fluid coupling sealing device, which comprises the following specific operation steps:

(1) cleaning a main drive seal installation cavity of the heading machine, wherein the main drive seal installation cavity comprises the inner wall of a heading machine adapter flange 1 and the outer wall of a wear-resisting ring 21, so that cleanness and no impurities are ensured;

(2) installing a right spacer ring 34, and installing the right spacer ring to a preset position along the inner wall of the adapter flange 1 of the development machine;

(3) installing a right metal pole shoe 32 and a magnetic rubber pole tooth 33 to ensure that the metal pole shoe 32 is tightly attached to a right spacer ring 34, an O-shaped seal 322 on the outer side of the metal pole shoe 32 is tightly attached to the inner wall of the adapter flange 1 of the heading machine, and double D-shaped seals on the inner side of the magnetic rubber pole tooth 33 are tightly attached to the outer wall of the wear-resistant ring 21;

(4) a permanent magnet 31 is arranged to ensure that the permanent magnet is tightly attached to the right metal pole shoe 32;

(5) installing a left metal pole shoe 32 and a magnetic rubber pole tooth 33 to ensure that the metal pole shoe 32 is tightly attached to the permanent magnet 31, wherein an O-shaped seal 322 on the outer side of the metal pole shoe 32 is tightly attached to the inner wall of the adapter flange 1 of the heading machine, and a double D-shaped seal on the inner side of the magnetic rubber pole tooth 33 is tightly attached to the outer wall of the wear-resistant ring 21;

(6) a left spacer ring 34 is arranged to ensure that the left metal pole shoe 32 is tightly attached;

(7) installing a pressing ring 35 to a preset position, connecting the pressing ring 35 with the adapter flange 1 of the heading machine through a bolt, pressing the left spacer ring 34 by the pressing ring 35, and fixing the coupling sealing device 3;

(8) based on the data collected by the pressure transmitter 37, the magnetic fluid 38 is injected into the magnetic fluid injection hole 36 until a predetermined pressure is reached.

Preferably, in the steps (2) to (6), the installation depth is measured by a vernier caliper in each step, and the next step is performed after the preset depth is reached.

The working principle of the invention is as follows: the magnetic rubber pole teeth 33 are matched with the wear-resistant ring 21 to play a role in rotary sealing, the permanent magnet 31, the metal pole shoe 32, the magnetic rubber pole teeth 33, the support ring 2 of the heading machine and the wear-resistant ring 21 jointly form a closed magnetic circuit, and at the moment, the magnetic fluid 38 is uniformly distributed on the inner side of the magnetic rubber pole teeth 33 due to the liquid fluidity and the magnetic effect of the magnetic fluid, so that a rubber-magnetic fluid coupling sealing mode is formed, and the rotary sealing strength is further improved. When the magnetic rubber pole teeth 33 are worn to generate a contact surface gap, closing the magnetic circuit can prompt the magnetic fluid 38 to supplement the gap in time and achieve a new balance state; when the leakage of the magnetic fluid 38 per se is detected through data of the pressure transmitter 37, the magnetic fluid 38 can be actively and additionally injected into the magnetic fluid injection hole 36, and the sealing performance is good.

The sealing device provided by the invention avoids the problems of sand entering a gear box or oil leakage of a gear and large consumption of sealing grease and the like caused by the abrasion failure of the traditional lip seal due to a severe construction environment, improves the defect of sealing failure caused by the sensitivity of the common magnetic fluid seal to a liquid medium, combines the advantages of the two, has the characteristics of low sealing cost, abrasion self-compensation, leakage self-compensation, good sealing performance, low maintenance frequency and the like, meets the construction requirements of the tunneling machine, and can be widely popularized and applied to various tunneling machines.

While the foregoing disclosure has set forth numerous specific details for a thorough understanding of the invention, the invention may be embodied in other specific forms than those described herein, and it will be apparent to those skilled in the art that the invention is not limited to the specific embodiments disclosed above.