Retractable and extendable air pipe device, rear corollary equipment and heading machine

Abstract

The utility model provides a retractable and extendable air pipe device, rear corollary equipment and a heading machine, and belongs to the technical field of heading equipment. The retractable and extendable air pipe device comprises a flexible air pipe, a front-end hard air pipe and a rear-end hard air pipe and further comprises a retractable hard air pipe connected with the flexible air pipe, the retractable hard air pipe is connected to the front side or the rear side of the flexible air pipe, one of the front-end hard air pipe and the rear-end hard air pipe is nested with the retractable hard air pipe and is in sliding fit with the retractable hard air pipe, and the other one of the front-end hard air pipe and the rear-end hard air pipe is connected with the flexible air pipe. The telescopic hard air pipe is in sliding fit with the rear-end hard air pipe or the front-end hard air pipe, so that the air pipe device is extended and shortened, the telescopic hard air pipe is matched with the stretching of the dragging oil cylinder to adapt to the movement of the front trailer and the rear trailer, the stroke of the dragging oil cylinder does not need to be adapted through a longer soft air pipe like the prior art, and the operation is simple and convenient. The flexible air pipe can be as short as possible as long as the basic turning function of the trailer can be met, so that the wind resistance can be reduced, and the ventilation effect is not influenced.

Description

Technical Field

[0001] The utility model relates to a retractable and extendable air duct device, rear supporting equipment and a tunneling machine, belonging to the technical field of tunneling equipment. Background Art

[0002] During the excavation process of TBM, the towing cylinder stroke between the rear supporting trailer is long, and it needs to adapt to the turning of the trailer, so a soft air duct is required. In most cases, all connections are made with soft air ducts. Figure 1 The invention is an air duct device in the prior art, comprising a front trailer 20 and a rear trailer 60 arranged front and back, the front trailer 20 and the rear trailer 60 are connected by a towing cylinder 40, a front-end hard air duct 10 is fixed on the front trailer 20, a rear-end hard air duct 50 is fixed on the rear trailer 60, and the front-end hard air duct 10 and the rear-end hard air duct 50 are connected by a soft air duct 30. When in use, when the towing cylinder 40 is extended, the front trailer 20 moves forward, the front end of the soft air duct 30 moves with the front trailer 20, and the soft air duct 30 as a whole changes towards a gradually straightened posture; when the towing cylinder 40 is retracted, the rear trailer 60 moves forward, and the middle soft air duct 30 changes with the shape and becomes a U-shaped bend. In this way, when fresh air or dirty air passes through, the soft air duct 30 cannot become a straighter shape, which will cause a certain degree of blockage, thereby causing excessive wind resistance and affecting the ventilation effect. Meanwhile, the flexible air duct 30 is relatively long, and is prone to wear and tear with the trailer structure during the process of deformation as the trailer moves, thus causing damage. Utility Model Content

[0003] The purpose of the utility model is to provide a retractable and extendable air duct device to solve the problem that the existing air duct device uses a longer soft air duct to connect between the front hard air duct and the rear hard air duct to adapt to the stroke of the towing cylinder, which causes the soft air duct to be U-shaped when the towing cylinder is recovered, thereby causing excessive wind resistance and affecting the ventilation effect; the purpose of the utility model is also to provide a rear supporting equipment and a tunneling machine to solve the above-mentioned problem.

[0004] In order to achieve the above-mentioned purpose, the retractable and extendable air duct device in the utility model adopts the following technical solutions:

[0005] A retractable and extendable air duct device comprises a soft air duct, a front-end hard air duct for fixing on a front trailer, and a rear-end hard air duct for fixing on a rear trailer. The retractable and extendable air duct device also comprises a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, one of the front-end hard air duct and the rear-end hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct.

[0006] The beneficial effect of the above technical solution is that the utility model proposes an improved retractable and extendable air duct device, the improvement is that the air duct device also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, and one of the front hard air duct and the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct. In this way, when the telescopic hard air duct is connected to the rear side of the soft air duct, the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the front hard air duct is connected to the soft air duct. When the towing cylinder is extended, the front trailer moves forward, so that the front hard air duct The tube slides forward relative to the rear end hard air duct through the soft air duct with the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, driving the rear end hard air duct to slide forward relative to the telescopic hard air duct. When the telescopic hard air duct is connected to the front side of the soft air duct, the rear end hard air duct is connected to the soft air duct, and the front end hard air duct and the telescopic hard air duct are nested and slidably matched. When the towing cylinder is extended, the front trailer moves forward, driving the front end hard air duct to slide forward relative to the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, causing the rear end hard air duct to slide forward relative to the front end hard air duct through the soft air duct with the telescopic hard air duct.

[0007] In the above two technical solutions, the extension and shortening of the air duct device is achieved through the sliding cooperation between the telescopic hard air duct and the rear end hard air duct or the telescopic hard air duct and the front end hard air duct, thereby cooperating with the extension and retraction of the towing cylinder to adapt to the movement of the front trailer and the rear trailer. There is no need to use a longer soft air duct to adapt to the stroke of the towing cylinder as in the prior art. Therefore, the soft air duct in the utility model can be set shorter as long as it can meet the basic function of the trailer turning, thereby reducing wind resistance and ensuring that the ventilation effect is not affected.

[0008] Furthermore, the rear end rigid air duct is nested and slidably matched with the telescopic rigid air duct, the front end rigid air duct is connected to the soft air duct, the front and rear ends of the soft air duct are respectively provided with a front flange and a rear flange, and a flexible connector is fixedly connected between the front flange and the rear flange.

[0009] Furthermore, the flexible connecting member is a chain.

[0010] Furthermore, the telescopic rigid air duct is inserted into the interior of the rear end rigid air duct, and a sealing member that seals with the outer peripheral surface of the telescopic rigid air duct is provided at the front end of the rear end rigid air duct.

[0011] Furthermore, a first front end flange is provided at the front end of the rear end rigid air duct, a sealing flange is connected to the first front end flange, and the sealing member is a sealing ring clamped and fixed between the first front end flange and the sealing flange.

[0012] Furthermore, the front end hard air duct has a rear extension section for extending rearwardly of the front trailer, the rear end hard air duct has a front extension section for extending forwardly of the rear trailer, and the soft air duct and the telescopic hard air duct are connected between the rear extension section and the front extension section.

[0013] Furthermore, air duct brackets for fixing to the corresponding trailer are respectively provided on the front end rigid air duct and the rear end rigid air duct.

[0014] Furthermore, a rear end flange is provided at the rear end of the front rigid air duct, and the rear end flange is connected to the front flange of the tube; a second front end flange is provided at the front end of the telescopic rigid air duct, and the second front end flange is connected to the rear flange of the tube.

[0015] In order to achieve the above purpose, the following technical solutions are adopted in the rear supporting equipment of the utility model:

[0016] A rear supporting equipment includes a front trailer and a rear trailer arranged front and back, and also includes an air duct device installed on the front trailer and the rear trailer, the air duct device includes a soft air duct, a front-end hard air duct fixed on the front trailer, and a rear-end hard air duct fixed on the rear trailer, the air duct device also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, one of the front-end hard air duct and the rear-end hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct.

[0017] The beneficial effect of the above technical solution is that the utility model proposes an improved rear supporting equipment, the improvement is that the air duct device of the rear supporting equipment also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, and one of the front hard air duct and the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct. In this way, when the telescopic hard air duct is connected to the rear side of the soft air duct, the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the front hard air duct is connected to the soft air duct. When the towing cylinder is extended, the front trailer moves forward, so that the front hard air duct The air duct slides forward relative to the rear end hard air duct through the soft air duct with the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, driving the rear end hard air duct to slide forward relative to the telescopic hard air duct. When the telescopic hard air duct is connected to the front side of the soft air duct, the rear end hard air duct is connected to the soft air duct, and the front end hard air duct and the telescopic hard air duct are nested and slidably matched. When the towing cylinder is extended, the front trailer moves forward, driving the front end hard air duct to slide forward relative to the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, causing the rear end hard air duct to slide forward relative to the front end hard air duct through the soft air duct with the telescopic hard air duct.

[0018] In the above two technical solutions, the extension and shortening of the air duct device is achieved through the sliding cooperation between the telescopic hard air duct and the rear end hard air duct or the telescopic hard air duct and the front end hard air duct, thereby cooperating with the extension and retraction of the towing cylinder to adapt to the movement of the front trailer and the rear trailer. There is no need to use a longer soft air duct to adapt to the stroke of the towing cylinder as in the prior art. Therefore, the soft air duct in the utility model can be set shorter as long as it can meet the basic function of the trailer turning, thereby reducing wind resistance and ensuring that the ventilation effect is not affected.

[0019] Furthermore, the rear end rigid air duct is nested and slidably matched with the telescopic rigid air duct, the front end rigid air duct is connected to the soft air duct, the front and rear ends of the soft air duct are respectively provided with a front flange and a rear flange, and a flexible connector is fixedly connected between the front flange and the rear flange.

[0020] Furthermore, the flexible connecting member is a chain.

[0021] Furthermore, the telescopic rigid air duct is inserted into the interior of the rear end rigid air duct, and a sealing member which seals with the outer peripheral surface of the telescopic rigid air duct is provided at the front end of the rear end rigid air duct.

[0022] Furthermore, a first front end flange is provided at the front end of the rear end rigid air duct, a sealing flange is connected to the first front end flange, and the sealing member is a sealing ring clamped and fixed between the first front end flange and the sealing flange.

[0023] Furthermore, the front end hard air duct has a rear extension section for extending rearwardly of the front trailer, the rear end hard air duct has a front extension section for extending forwardly of the rear trailer, and the soft air duct and the telescopic hard air duct are connected between the rear extension section and the front extension section.

[0024] Furthermore, air duct brackets for fixing to the corresponding trailer are respectively provided on the front end rigid air duct and the rear end rigid air duct.

[0025] Furthermore, a rear end flange is provided at the rear end of the front rigid air duct, and the rear end flange is connected to the front flange of the tube; a second front end flange is provided at the front end of the telescopic rigid air duct, and the second front end flange is connected to the rear flange of the tube.

[0026] In order to achieve the above-mentioned purpose, the tunnel boring machine in the utility model adopts the following technical solutions:

[0027] A tunnel boring machine includes a main machine and rear supporting equipment, the rear supporting equipment includes a front trailer and a rear trailer arranged front and back, and also includes an air duct device installed on the front trailer and the rear trailer, the air duct device includes a soft air duct, a front-end hard air duct fixed on the front trailer, and a rear-end hard air duct fixed on the rear trailer, the air duct device also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, one of the front-end hard air duct and the rear-end hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct.

[0028] The beneficial effect of the above technical solution is that the utility model proposes an improved tunneling machine, the improvement is that the air duct device of the rear supporting equipment also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front side or the rear side of the soft air duct, and one of the front hard air duct and the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct. In this way, when the telescopic hard air duct is connected to the rear side of the soft air duct, the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the front hard air duct is connected to the soft air duct. When the towing cylinder is extended, the front trailer moves forward, so that the front hard air duct The tube slides forward relative to the rear end hard air duct through the soft air duct with the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, driving the rear end hard air duct to slide forward relative to the telescopic hard air duct. When the telescopic hard air duct is connected to the front side of the soft air duct, the rear end hard air duct is connected to the soft air duct, and the front end hard air duct and the telescopic hard air duct are nested and slidably matched. When the towing cylinder is extended, the front trailer moves forward, driving the front end hard air duct to slide forward relative to the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, causing the rear end hard air duct to slide forward relative to the front end hard air duct through the soft air duct with the telescopic hard air duct.

[0029] In the above two technical solutions, the extension and shortening of the air duct device is achieved through the sliding cooperation between the telescopic hard air duct and the rear end hard air duct or the telescopic hard air duct and the front end hard air duct, thereby cooperating with the extension and retraction of the towing cylinder to adapt to the movement of the front trailer and the rear trailer. There is no need to use a longer soft air duct to adapt to the stroke of the towing cylinder as in the prior art. Therefore, the soft air duct in the utility model can be set shorter as long as it can meet the basic function of the trailer turning, thereby reducing wind resistance and ensuring that the ventilation effect is not affected.

[0030] Furthermore, the rear end rigid air duct is nested and slidably matched with the telescopic rigid air duct, the front end rigid air duct is connected to the soft air duct, the front and rear ends of the soft air duct are respectively provided with a front flange and a rear flange, and a flexible connector is fixedly connected between the front flange and the rear flange.

[0031] Furthermore, the flexible connecting member is a chain.

[0032] Furthermore, the telescopic rigid air duct is inserted into the interior of the rear end rigid air duct, and a sealing member which seals with the outer peripheral surface of the telescopic rigid air duct is provided at the front end of the rear end rigid air duct.

[0033] Furthermore, a first front end flange is provided at the front end of the rear end rigid air duct, a sealing flange is connected to the first front end flange, and the sealing member is a sealing ring clamped and fixed between the first front end flange and the sealing flange.

[0034] Furthermore, the front end hard air duct has a rear extension section for extending rearwardly of the front trailer, the rear end hard air duct has a front extension section for extending forwardly of the rear trailer, and the soft air duct and the telescopic hard air duct are connected between the rear extension section and the front extension section.

[0035] Furthermore, air duct brackets for fixing to the corresponding trailer are respectively provided on the front end rigid air duct and the rear end rigid air duct.

[0036] Furthermore, a rear end flange is provided at the rear end of the front rigid air duct, and the rear end flange is connected to the front flange of the tube; a second front end flange is provided at the front end of the telescopic rigid air duct, and the second front end flange is connected to the rear flange of the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a usage state diagram of the air duct device in the prior art;

[0038] Figure 2 This is a diagram showing the use state of the retractable and extendable air duct device in the utility model;

[0039] Figure 3 It is a process diagram of the retractable and extendable air duct device in the utility model when the towing cylinder is not extended, after extension and after recovery;

[0040] Figure 4 It is a schematic diagram of the cooperation between the telescopic hard air duct and the rear hard air duct of the retractable and extendable air duct device in the utility model;

[0041] Figure 1 Middle: 10, front hard air duct; 20, front trailer; 30, soft air duct; 40, towing cylinder; 50, rear hard air duct; 60, rear trailer;

[0042] Figure 2~Figure 4 Middle: 1. Front end hard air duct; 2. Front trailer; 3. Soft air duct; 4. Towing cylinder; 5. Rear end hard air duct; 5-1. First front end flange; 5-2. Sealing flange; 5-3. Sealing ring; 6. Rear trailer; 7. Air duct bracket; 8. Chain; 9. Telescopic hard air duct. DETAILED DESCRIPTION

[0043] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0044] The retractable and extendable air duct device of the utility model comprises a telescopic hard air duct connected to the soft air duct. When in use, the telescopic hard air duct and the front hard air duct or the rear hard air duct slide with each other to adapt to the stroke of the towing cylinder, thereby eliminating the need for a very long soft air duct. The soft air duct can be set as short as possible as long as it can meet the basic function of the trailer turning, thereby reducing wind resistance and ensuring that the ventilation effect is not affected.

[0045] Embodiment 1 of the retractable and extendable air duct device of the present invention:

[0046] like Figure 2 and Figure 3 As shown, the retractable and extendable air duct device includes a front-end hard air duct 1, a soft air duct 3, a telescopic hard air duct 9, and a rear-end hard air duct 5, wherein the front-end hard air duct 1 is used to be fixed on the front trailer 2 of the rear supporting equipment, and the rear-end hard air duct 5 is used to be fixed on the rear trailer 6 of the rear supporting equipment. Specifically, the front-end hard air duct 1 and the rear-end hard air duct 5 are respectively provided with air duct brackets 7 for fixing on the corresponding trailers.

[0047] In the present invention, the telescopic rigid air duct 9 is connected to the flexible air duct 3 and is connected to the rear side of the flexible air duct 3, the front rigid air duct 1 is connected to the flexible air duct 3, and the rear rigid air duct 5 is nested and slidably matched with the telescopic rigid air duct 9, that is, the flexible air duct 3 and the telescopic rigid air duct 9 are connected between the front rigid air duct 1 and the rear rigid air duct 5. In addition, the front rigid air duct 1 has a rear extension section for extending the front trailer 2 backward, and the rear rigid air duct 5 has a front extension section for extending the rear trailer 6 forward, and the flexible air duct 3 and the telescopic rigid air duct 9 are connected between the rear extension section and the front extension section, so that the flexible air duct 3 can be set as short as possible under the premise of meeting the basic function of the trailer turning.

[0048] Furthermore, a rear end flange is provided at the rear end of the front rigid air duct 1, and a front flange and a rear flange are provided at the front and rear ends of the flexible air duct 3, respectively. The rear flange of the front rigid air duct 1 is connected to the front flange of the flexible air duct 3, which facilitates the connection between the front rigid air duct 1 and the flexible air duct 3. A second front flange is provided at the front end of the telescopic rigid air duct 9, which is connected to the rear flange, which facilitates the connection between the flexible air duct 3 and the telescopic rigid air duct 9.

[0049] Furthermore, a flexible connector is fixedly connected between the front flange and the rear flange, so that when the front trailer 2 drives the front hard air duct 1 to move forward, the soft air duct 3 can conveniently pull the telescopic hard air duct 9 forward through the flexible connector to avoid deformation of the soft air duct 3, and the flexible connector will not affect the turning of the trailer. As an embodiment, the flexible connector is a chain 8, and a plurality of chains 8 are arranged along the circumference to ensure uniform force. In other embodiments, a pull rope can also be used as the flexible connector.

[0050] In this embodiment, the telescopic rigid air duct 9 is inserted into the rear rigid air duct 5. To ensure smooth sliding of the telescopic rigid air duct 9, there is a gap between the two. To ensure the sealing between the two and avoid air leakage affecting the ventilation effect, a sealing member that seals with the outer peripheral surface of the telescopic rigid air duct 5 is provided at the front end of the rear rigid air duct 5. Figure 4As shown, the front end of the rear rigid air duct 5 is provided with a first front flange 5-1, and the first front flange 5-1 is connected with a matching sealing flange 5-2, and the sealing member is a sealing ring 5-3 sandwiched and fixed between the first front flange 5-1 and the sealing flange 5-2, and the sealing ring 5-3 blocks the gap between the telescopic rigid air duct 9 and the rear rigid air duct 5 to prevent air leakage. In order to ensure a better sealing effect, two sealing rings 5-3 are provided in this embodiment.

[0051] like Figure 2 As shown, during the excavation process of the TBM, the towing cylinder 4 of the rear supporting equipment needs to extend and retract to adapt to different excavation conditions. Therefore, when the distance between the hard air ducts between the two trailers becomes larger or smaller, the retractable and extendable air duct device of the utility model can retract and extend according to the distance between the hard air ducts on the trailers, thereby ensuring the smoothness of the ventilation duct. The movement of the air duct is synchronized with the movement of the towing cylinder 4, and there is an adaptive process, which effectively avoids the wear of the soft air duct 3. The specific process of retraction and extension is as follows:

[0052] Air duct extension process: During the process of the equipment moving forward, when the rear supporting equipment has just completed a step and the drag cylinder 4 has not extended, the state is as follows Figure 3 As shown in (a); when the towing cylinder 4 is extended, the front trailer 2 moves forward, driving the front hard air duct 1 fixed thereon to move forward, the front hard air duct 1 is connected to the soft air duct 3 by a flange, the soft air duct 3 is connected to the telescopic hard air duct 9 by a flange, and at the same time, a chain 8 is fixedly connected between the front flange and the rear flange of the soft air duct 3, so that the front hard air duct 1, the soft air duct 3, and the telescopic hard air duct 9 are formed into a temporary whole. At this time, under the tension of the chain 8, the front hard air duct 1 drives the telescopic hard air duct 9 to move forward through the soft air duct 3, and there is a certain gap between the telescopic hard air duct 9 and the rear hard air duct 5, and it extends out from the inside of the rear hard air duct 5, as shown in FIG. Figure 3 As shown in (b), the moving distance d is the distance that the pulling cylinder 4 extends.

[0053] Air duct retraction process: During the forward excavation of the equipment, when the towing cylinder 4 is retracted, the rear trailer 6 moves forward. Since there is a certain gap between the telescopic rigid air duct 9 and the rear rigid air duct 5, when the rear rigid air duct 5 moves forward, it is equivalent to the telescopic rigid air duct 9 being retracted backward into the rear rigid air duct 5. Figure 3 As shown in (c), the moving distance is the distance that the pulling cylinder 4 is recovered.

[0054] Therefore, during the extension of the air duct device, the stretching hard air duct 9 is pulled forward by the tensioning action of the chain 8 to achieve the extension action; during the contraction of the air duct, the rear hard air duct 5 is moved forward to achieve the contraction action. During the entire extension and contraction process of the air duct device, the soft air duct 3 does not change much, and the soft air duct 3 is short enough to avoid wear of the soft air duct 3 during the contraction and extension process.

[0055] In summary, this embodiment realizes the extension and shortening of the air duct device through the sliding cooperation between the telescopic hard air duct 9 and the rear end hard air duct 5, thereby cooperating with the extension and retraction of the towing cylinder 4 to adapt to the movement of the front trailer 2 and the rear trailer 6. There is no need to use a longer soft air duct to adapt to the stroke of the towing cylinder as in the prior art. Therefore, the soft air duct in the utility model can be set shorter as long as it can meet the basic function of the trailer turning, thereby reducing wind resistance and ensuring that the ventilation effect is not affected.

[0056] In other embodiments of the retractable and extendable air duct device, when a front flange and a rear flange are respectively provided at the front and rear ends of the soft air duct, a rear end flange may not be provided at the rear end of the front rigid air duct, and the rear end of the front rigid air duct is directly welded or bonded to the front flange. Of course, the front end of the telescopic rigid air duct may not be provided with a second front flange, and the front end of the telescopic rigid air duct is directly welded or bonded to the rear flange.

[0057] In other embodiments of the retractable and extendable air duct device, the front-end rigid air duct and the rear-end rigid air duct may also be directly welded and fixed on the corresponding trailer, thereby eliminating the air duct bracket.

[0058] In other embodiments of the retractable and extendable air duct device, only the front end rigid air duct may have a rear extension section extending rearwardly of the front trailer, while the front end of the rear end rigid air duct is aligned with the front end of the rear trailer; in other embodiments, only the rear end rigid air duct may have a front extension section extending forwardly of the rear trailer, while the rear end of the front end rigid air duct is aligned with the rear end of the front trailer.

[0059] In other embodiments of the retractable and extendable air duct device, the number of the sealing rings may be only one, or three.

[0060] In other embodiments of the retractable and extendable air duct device, the first front end flange may not be set at the front end of the rear end rigid air duct, and the sealing flange is no longer connected. When the wall thickness of the rear end rigid air duct is sufficient, an annular mounting groove can be directly processed on the inner wall of the rear end rigid air duct. In this case, the seal is a sealing ring installed in the annular mounting groove.

[0061] In other embodiments of the retractable and extendable air duct device, the nested matching relationship between the telescopic rigid air duct and the rear end rigid air duct can be that the telescopic rigid air duct is sleeved on the outside of the rear end rigid air duct, and at this time, a seal that seals with the inner wall of the telescopic rigid air duct can be provided on the periphery of the rear end rigid air duct.

[0062] In other embodiments of the retractable and extendable air duct device, no matter whether the retractable rigid air duct is inserted into the interior of the rear end rigid air duct or is sleeved on the exterior of the rear end rigid air duct, no seal may be provided between the two. Instead, the fitting gap between the two may be made small enough by controlling the dimensional accuracy.

[0063] In other embodiments of the retractable and extendable air duct device, the structure of the soft air duct may not include a flexible connector. In this case, a soft air duct with sufficient strength can be selected to utilize the strength of the soft air duct itself to pull the retractable hard air duct to move.

[0064] Embodiment 2 of the retractable and extendable air duct device in the utility model: The difference between this embodiment and embodiment 1 is that the telescopic hard air duct is connected to the front side of the soft air duct, at this time, the front hard air duct and the telescopic hard air duct are nested and slidably matched, and the rear hard air duct is connected to the soft air duct. When the towing cylinder is extended, the front trailer moves forward, driving the front hard air duct to slide forward relative to the telescopic hard air duct. When the towing cylinder is recovered, the rear trailer moves forward, so that the rear hard air duct slides forward relative to the front hard air duct with the telescopic hard air duct through the soft air duct. This embodiment realizes the extension and shortening of the air duct device through the sliding cooperation between the telescopic hard air duct and the front hard air duct, thereby cooperating with the extension and contraction of the towing cylinder and adapting to the movement of the front trailer and the rear trailer, and the effect is the same as that of embodiment 1. At the same time, the structure of the soft air duct, the cooperation mode between the front hard air duct and the telescopic hard air duct, and the connection mode between the soft air duct and the telescopic hard air duct and the rear hard air duct in this embodiment are all the same as those in embodiment 1.

[0065] An embodiment of the rear supporting equipment in the utility model is as follows: the rear supporting equipment includes a front trailer and a rear trailer arranged front and rear, and also includes an air duct device installed on the front trailer and the rear trailer, wherein the specific structure of the air duct device is the same as the retractable and extendable air duct device in the above embodiment, and will not be repeated here.

[0066] An embodiment of a tunnel boring machine in the utility model is as follows: the tunnel boring machine includes a main machine and rear supporting equipment, the rear supporting equipment includes a front trailer and a rear trailer arranged front and rear, and also includes an air duct device installed on the front trailer and the rear trailer, wherein the specific structure of the air duct device is the same as the retractable and extendable air duct device in the above-mentioned embodiment, and will not be repeated here.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retractable and extendable air duct device, comprising a soft air duct, a front-end hard air duct for fixing on a front trailer, and a rear-end hard air duct for fixing on a rear trailer, characterized in that: The retractable and extendable air duct device also includes a telescopic hard air duct connected to the soft air duct, the telescopic hard air duct is connected to the front or rear side of the soft air duct, one of the front hard air duct and the rear hard air duct is nested and slidably matched with the telescopic hard air duct, and the other is connected to the soft air duct.

2. The retractable and extendable air duct device according to claim 1, characterized in that: The rear end rigid air duct is nested and slidably matched with the telescopic rigid air duct, the front end rigid air duct is connected with the soft air duct, the front and rear ends of the soft air duct are respectively provided with a front flange and a rear flange, and a flexible connector is fixedly connected between the front flange and the rear flange.

3. The retractable and extendable air duct device according to claim 2, characterized in that: The flexible connection is a chain.

4. The retractable and extendable air duct device according to claim 2 or 3, characterized in that: The telescopic rigid air duct is inserted into the interior of the rear-end rigid air duct, and a sealing member which is sealed and matched with the outer peripheral surface of the telescopic rigid air duct is arranged at the front end of the rear-end rigid air duct.

5. The retractable and extendable air duct device according to claim 4, characterized in that: A first front end flange is arranged at the front end of the rear end rigid air duct, a sealing flange is connected to the first front end flange, and the sealing member is a sealing ring clamped and fixed between the first front end flange and the sealing flange.

6. The retractable and extendable air duct device according to any one of claims 1 to 3, characterized in that: The front end hard air duct has a rear extension section for extending the front trailer backward, the rear end hard air duct has a front extension section for extending the rear trailer forward, and the soft air duct and the telescopic hard air duct are connected between the rear extension section and the front extension section.

7. The retractable and extendable air duct device according to any one of claims 1 to 3, characterized in that: The front-end rigid air duct and the rear-end rigid air duct are respectively provided with air duct brackets for fixing on the corresponding trailer.

8. The retractable and extendable air duct device according to claim 2 or 3, characterized in that: The rear end of the front rigid air duct is provided with a rear end flange, which is connected to the front flange of the duct; the front end of the telescopic rigid air duct is provided with a second front end flange, which is connected to the rear flange of the duct.

9. A rear supporting equipment, comprising a front trailer and a rear trailer arranged in front and behind, and also comprising an air duct device installed on the front trailer and the rear trailer, characterized in that: The air duct device is a retractable and extendable air duct device as described in any one of claims 1 to 8.

10. A tunnel boring machine, comprising a main machine and rear supporting equipment, wherein the rear supporting equipment comprises a front trailer and a rear trailer arranged in front and behind, and also comprises an air duct device installed on the front trailer and the rear trailer, characterized in that: The air duct device is a retractable and extendable air duct device as described in any one of claims 1 to 8.

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