Heading machine main drive sealing structure and heading machine

Abstract

The utility model relates to the technical field of tunnel construction, and provides a main drive sealing structure of a heading machine and the heading machine, which are used for sealing a sealing cavity formed between a first structural member and a second structural member on the heading machine and realizing sealing compensation. The closed cavity is provided with an opening communicated with the sealed cavity; the elastic cushion is connected to the opening of the closed cavity in a sealing manner; the sealing piece is arranged in the sealing cavity and is opposite to the elastic cushion; and in the state that a pressurizing medium is introduced into the closed cavity, the elastic cushion expands to apply pressing force towards the second structural part to the sealing part, so that a sealing gap generated between the sealing part and the second structural part due to abrasion or pressure change of the sealing part is compensated. Based on the compensation principle, the abrasion loss is compensated after the seal is abraded, and the problems that the compression amount is insufficient and the sealing performance is reduced due to abrasion of the main drive seal of the heading machine can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field especially relates to a tunneling machine main drive sealing structure and tunneling machine. BACKGROUND

[0002] The tunnel boring machine has been widely applied to the underground space construction and the tunnel construction field. In the construction process, the main drive system of the tunnel boring machine provides the power for the rotation of the cutter head, and realizes the cutting of the cutter head to the stratum. In order to avoid the contact of the main drive with the dust and impurities in the outside world, it is necessary to set up the main drive sealing system on the main drive, and the main drive sealing system plays a crucial role in the normal operation of the tunnel boring machine equipment, and directly determines the performance of the tunnel boring machine.

[0003] The sealing ring in the main drive sealing system of the tunnel boring machine is installed in the sealing cavity with a certain compression amount and contacts with the sealing runway. During the operation of the equipment, the sealing ring and the sealing runway do the relative rotation and the contact area of the two is rubbed to cause the abrasion, and then the compression amount of the sealing ring is insufficient, the sealing performance is reduced, and then the impurities such as sand, soil and water cannot be blocked to invade the main bearing, the main drive system is damaged, and the risks such as equipment shutdown and increased construction cost are caused.

[0004] Therefore, in view of the problem of insufficient compression amount and reduced sealing performance caused by the abrasion of the sealing ring, the sealing abrasion monitoring is adopted at the present stage, the sealing abrasion condition can be predicted in advance, and the continuous deterioration of the sealing system can be avoided, but a reasonable treatment scheme cannot be given for the treatment after the sealing abrasion, and the existing technology usually needs to replace the sealing ring after the abrasion.

[0005] Therefore, the utility model is based on the compensation principle and designs a main drive sealing structure, the sealing effect of the sealing ring can be maintained without replacement after the abrasion of the sealing ring, so as to overcome the defects of the prior art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a tunneling machine main drive sealing structure and tunneling machine, which compensates the abrasion amount after the sealing abrasion based on the compensation principle, and can solve the problem of insufficient compression amount and reduced sealing performance of the main drive sealing of the tunnel boring machine caused by the abrasion.

[0007] The above technical purpose of the utility model is mainly realized by the following technical scheme.

[0008] On the one hand, the utility model provides a tunneling machine main drive sealing structure for sealing the sealing cavity formed between the first structural member and the second structural member on the tunnel boring machine and realizing the sealing compensation, and the tunneling machine main drive sealing structure comprises:

[0009] The closed cavity is arranged on the first structural member, and the closed cavity has an opening in communication with the sealing cavity.

[0010] an elastic pad sealingly connected to the opening of the closed cavity;

[0011] a sealing member arranged in the sealing cavity and opposite to the elastic pad;

[0012] wherein, in a state that the pressurized medium is introduced into the closed cavity, the elastic pad is inflated to apply a pressing force to the sealing member towards the second structural member, so as to compensate for the sealing gap between the sealing member and the second structural member due to wear or pressure change.

[0013] In a preferred embodiment of the utility model, the first structural member is provided with a medium pipeline in communication with the closed cavity, and the medium pipeline is used for introducing the pressurized medium into the closed cavity.

[0014] In a preferred embodiment of the utility model, the first structural member, the second structural member, the elastic pad and the sealing member are all annular members.

[0015] In a preferred embodiment of the utility model, the first structural member is a grease ring, and the second structural member is a rotating runway.

[0016] In a preferred embodiment of the utility model, the elastic pad is provided with a pressing plate on both sides, and a screw is screwed with the first structural member through the pressing plate and the elastic pad, so as to seal and fix the both sides of the elastic pad on the first structural member.

[0017] In a preferred embodiment of the utility model, one or more sealing members are arranged in the sealing cavity along the axial direction of the heading machine, and the first structural member is provided with one closed cavity corresponding to each sealing member.

[0018] In a preferred embodiment of the utility model, the sealing member is a lip-shaped sealing ring, which comprises a main body part and a sealing lip part connected together, the main body part is installed in the closed cavity through a spacer ring, and the sealing lip part is towards the second structural member and in sealing contact with the second structural member.

[0019] In a preferred embodiment of the utility model, the elastic pad is a rubber pad.

[0020] In a preferred embodiment of the utility model, the pressurized medium is gas or liquid.

[0021] On the other hand, the utility model also provides a heading machine, which has the heading machine main drive sealing structure as described above.

[0022] Compared with the prior art, the technical scheme has the following characteristics and advantages:

[0023] In case of wear or pressure change of the sealing member (sealing lip of the lip-shaped sealing ring), the sealed cavity is filled with pressure medium (such as high-pressure gas), the high-pressure gas makes the elastic pad expand and apply a holding force to the sealing member, the sealing member is pressed against the second structural member (rotary raceway), thereby compensating for the decrease of the sealing performance caused by wear or pressure change, improving the service life of the main drive sealing system, and reducing the replacement frequency of the sealing member. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the drawings:

[0025] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present application in any way. In addition, the shape and scale of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shape and scale of the components in the present application. Those skilled in the art can select various possible shapes and scales to implement the present application according to specific conditions under the guidance of the present application.

[0026] Figure 1 The utility model discloses a main drive sealing structure of heading machine.

[0027] Mark explanation:

[0028] 10, grease ring; 11, rotary raceway; 12, sealing cavity;

[0029] 20, sealed cavity; 21, elastic pad; 22, medium pipeline; 23, pressing plate; 24, screw;

[0030] 30, lip-shaped sealing ring; 31, main body; 32, sealing lip. DETAILED DESCRIPTION

[0031] In order to make the technical scheme in the utility model better understood by the person skilled in the art, the technical scheme in the utility model embodiments will be clearly and completely described below in conjunction with the accompanying drawings of the utility model embodiments. Obviously, the described embodiments are only a 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 the person skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0032] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are made only for purposes of illustration, and are not intended to be limiting.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] Embodiment one:

[0035] The utility model provides a kind of main drive sealing structure of heading machine, for the sealing cavity 12 formed between first structural member and second structural member on heading machine is sealed and realizes sealing compensation, the main drive sealing structure of heading machine includes closed cavity 20, elastic pad 21 and sealing piece.Closed cavity 20 is located on first structural member, closed cavity 20 has the opening being communicated with sealing cavity 12;Elastic pad 21 is sealed and is connected on the opening of closed cavity 20;Sealing piece is arranged in sealing cavity 12 and is opposite with elastic pad 21;Wherein, in the state that pressurized medium is introduced into closed cavity 20, elastic pad 21 expands to sealing piece to apply the pressure of second structural member towards to compensate the sealing gap between sealing piece and second structural member due to abrasion or pressure variation.

[0036] The main drive sealing structure of heading machine, in the case where sealing piece produces abrasion or pressure variation (deformation due to extrusion), pressurized medium (such as high-pressure gas) is filled into closed cavity 20, high-pressure gas makes elastic pad 21 expand and acts a holding force on sealing piece, so that sealing piece is pressed to second structural member, and then the sealing performance caused by abrasion or pressure variation is compensated, the service life of main drive sealing system is improved, and the replacement frequency of sealing piece is reduced.

[0037] The specific structure of each part of the main driving sealing structure of the heading machine and the positional and connecting relationship between the parts will be described in detail below.

[0038] First, the position of the sealing structure is described, that is, the specific structure of the first structural member and the second structural member is described. The sealing structure described in the utility model is used for sealing the main driving. Since the main driving is a rotary part, the sealing structure is a rotary seal. Correspondingly, the first structural member and the second structural member are both annular rotary parts. As shown in Figure 1 The first structural member is a grease ring 10, and the second structural member is a rotating runway 11. The grease ring 10 is sleeved on the outer periphery of the rotating runway 11, and an annular sealing cavity 12 is formed between the grease ring 10 and the rotating runway 11. The sealing structure described in the utility model is used for sealing and sealing compensation of the annular sealing cavity 12. When the heading machine is working, the shield body and the grease ring 10 thereon do not rotate, and the driving disc and the rotating runway 11 rotate under the driving of the main driving.

[0039] Of course, the first structural member and the second structural member are not limited to annular structures (rotary connecting pairs). In other embodiments of the utility model, a sliding connecting pair can be formed between the first structural member and the second structural member, that is, the first structural member and the second structural member are two sliding plates that can slide relative to each other, and a sliding sealing cavity is formed between the two sliding plates. The sealing structure described in the utility model can also be used for sealing and sealing compensation of the sliding sealing cavity.

[0040] The main driving sealing structure of the heading machine described in the utility model has a closed cavity 20. The closed cavity 20 is arranged on the first structural member. In this embodiment, the closed cavity 20 is arranged on the grease ring 10. The closed cavity 20 is arranged on the side (inner side surface) of the grease ring 10 facing the sealing cavity 12, and the closed cavity 20 has an opening communicating with the sealing cavity 12. The closed cavity 20 is an annular chamber arranged along the circumferential direction of the grease ring 10. Correspondingly, the opening of the closed cavity 20 is also an annular opening. The cross-sectional shape of the closed cavity 20 is rectangular.

[0041] The main driving sealing structure of the heading machine described in the utility model also has an elastic pad 21, as shown in Figure 1 The elastic pad 21 is sealingly connected to the opening of the closed cavity 20, which separates the closed cavity 20 and the sealing cavity 12. The elastic pad 21 is an annular pad that seals the entire annular opening, thereby forming a relatively closed chamber in the closed cavity 20. The elastic pad 21 has a certain elasticity and can be elastically deformed under the action of an external force. The elastic pad 21 can be a rubber pad.

[0042] Further, as shown in Figure 1As shown, in order to realize the sealing connection between the elastic pad 21 and the grease ring 10, the two sides of the elastic pad 21 are provided with pressing plates 23, and the screws 24 are screwed with the grease ring 10 after penetrating the pressing plates 23 and the elastic pad 21, so as to seal and fix the two sides of the elastic pad 21 on the grease ring 10. A pressing plate groove is formed on the inner side surface of the grease ring 10, the elastic pad 21 is placed in the pressing plate groove and seals the opening of the closed cavity 20, and the pressing plate 23 is arranged in the pressing plate groove and is fixed by the screw 24. The inner side surface of the fixed pressing plate 23 is flush with the inner side surface of the grease ring 10; meanwhile, the elastic pad 21 between the two pressing plates 23 has a certain excess amount to form a U-shaped protrusion towards the sealing cavity 12, and the bottom of the U-shaped protrusion is flush with the inner side surface of the grease ring 10.

[0043] The tunneling machine main drive sealing structure also has a sealing element, such as Figure 1 As shown, the sealing element is arranged in the sealing cavity 12, and the sealing element is arranged opposite to the closed cavity 20, that is, the sealing element is arranged opposite to the elastic pad 21. In this embodiment, the sealing element is a lip-shaped sealing ring 30, and the lip-shaped sealing ring 30 comprises a main body part 31 and a sealing lip part 32 connected with each other, the main body part 31 is installed in the closed cavity 20 through a partition ring (not shown in the figure), and the sealing lip part 32 faces the rotating runway 11 and is in sealing contact with the rotating runway 11.

[0044] The working process of the tunneling machine main drive sealing structure is as follows:

[0045] When the sealing monitoring system (which can be set according to needs, prior art, not described here) detects that the sealing lip part 32 of the lip-shaped sealing ring 30 is worn, the contact force of the lip-shaped sealing ring 30 with the rotating runway 11 is insufficient, and it cannot effectively block the invasion of slag impurities, at this time, the pressure medium is filled into the closed cavity 20 to make the closed cavity 20 expand, the expansion of the closed cavity 20 makes the elastic pad 21 deform towards the direction of the sealing cavity 12, and then press the main body part 31 of the lip-shaped sealing ring 30, so that the sealing lip part 32 of the lip-shaped sealing ring 30 is more fitted to the rotating runway 11, thereby avoiding the problem of reduced sealing performance caused by wear, and reducing the replacement frequency of the lip-shaped sealing ring 30. The pressure medium can be gas or liquid, such as high-pressure air or high-pressure water.

[0046] The structure and technical effects of the preferred embodiment of the tunneling machine main drive sealing structure will be described in detail below.

[0047] According to one embodiment of the present application, as shown in Figure 1 As shown, the first structure (the grease ring 10) is provided with a medium pipeline 22 connected with the closed cavity 20, and the medium pipeline 22 is used for filling the pressure medium into the closed cavity 20.

[0048] According to one embodiment of the utility model, as shown in Figure 1 In order to improve the sealing effect of the sealing structure, a plurality of sealing elements (lip-shaped sealing rings 30) are arranged in the sealing cavity 12 along the axial direction of the heading machine. Corresponding to each sealing element, a closed cavity 20 is arranged on the first structural element (grease ring 10). That is, each lip-shaped sealing ring 30 is provided with a sealing compensation structure.

[0049] Embodiment two:

[0050] The utility model also provides a kind of heading machine, and the heading machine has the heading machine main drive sealing structure as described in embodiment one. The technical effect of the sealing structure on the heading machine has been described in embodiment one, which will not be repeated here.

[0051] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the utility model. It should be understood that the above description is only a specific embodiment of the utility model and does not limit the scope of protection. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the scope of protection.

Claims

1. A main drive sealing structure for a heading machine, for sealing and compensating a sealing space (12) formed between a first structural part and a second structural part of the heading machine, characterized in that include: A sealed cavity (20) is provided on the first structural member, the sealed cavity (20) having an opening that communicates with the sealed cavity (12); An elastic pad (21) is sealed to the opening of the sealed cavity (20); A sealing element is disposed within the sealing cavity (12) and is positioned opposite to the elastic pad (21); When a pressurized medium is introduced into the sealed cavity (20), the elastic pad (21) expands to apply a pressing force toward the second structural member to the seal, thereby compensating for the sealing gap between the seal and the second structural member caused by wear or compression of the seal.

2. The main drive sealing structure of the tunneling machine according to claim 1, characterized by, The first structural component has a medium pipeline (22) connected to the sealed cavity (20), and the medium pipeline (22) is used to introduce the pressurized medium into the sealed cavity (20).

3. The main drive sealing structure of the tunneling machine according to claim 1, characterized by, The first structural component, the second structural component, the elastic pad (21), and the sealing component are all annular components.

4. The main drive sealing structure of the tunneling machine according to claim 3, characterized in that, The first structural component is a grease ring (10), and the second structural component is a rotating runway (11).

5. The main drive seal structure of the tunneling machine according to claim 1, characterized by, Pressure plates (23) are pressed on both sides of the elastic pad (21), and screws (24) pass through the pressure plates (23) and the elastic pad (21) and are threadedly connected to the first structural member to seal and fix both sides of the elastic pad (21) on the first structural member.

6. The main drive sealing structure of the tunneling machine according to claim 3, characterized by, Along the axial direction of the tunneling machine, one or more of the sealing elements are provided in the sealing cavity (12), and corresponding to each of the sealing elements, the first structural member is provided with a sealed cavity (20).

7. The main drive sealing structure of the tunneling machine according to claim 3, characterized by, The sealing element is a lip-shaped sealing ring (30), which includes a connected main body (31) and a sealing lip (32). The main body (31) is installed in the sealed cavity (20) through a spacer ring, and the sealing lip (32) faces the second structural member and is in sealing contact with the second structural member.

8. A main drive sealing structure for a heading machine according to any one of claims 1 - 7, characterized in that, The elastic pad (21) is a rubber pad.

9. A main drive sealing structure for a heading machine according to any one of claims 1 - 7, characterized in that, The pressurizing medium is a gas or a liquid.

10. A heading machine characterized by The tunneling machine has a main drive sealing structure as described in any one of claims 1-9.

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