Screw conveyor for shield machine and shield machine

Abstract

The invention discloses a screw conveyor for a shield machine and a shield machine, which solves the problem in the prior art that it is difficult for the screw conveyor of the shield machine to transport thin slag, and has the beneficial effect of effectively preventing the thin slag from flowing down and avoiding the cleaning of the thin slag. The specific scheme is as follows: A screw conveyor for a shield machine comprises a screw rod arranged obliquely upward, the feeding end of the screw rod is located at the bottom behind the cutter disc of the shield machine, a barrel is arranged circumferentially on the screw, a first sleeve is arranged at the discharging end of the screw rod, a second sleeve is arranged at the feeding end of the screw rod, the barrel rod is fixedly connected to the screw rod and the barrel rod can realize rotation and linear movement relative to the first sleeve and the second sleeve, the first sleeve is provided with a slag discharge port, and there is a set distance between the top of the first sleeve and the assembled pipe segments in the tunnel.

Description

Technical Field

[0001] The invention relates to the field of tunnel construction, in particular to a screw conveyor for a shield machine and a shield machine. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the main construction method for subway section tunnels is shield method. The shield machine uses a screw conveyor to transport the excavated soil from the face to the belt conveyor, which is then transported to the muck truck and then hoisted to the ground. If the ground water content is low and the muck improvement effect is good, the muck in the plastic state can be smoothly transported through the screw conveyor and belt conveyor.

[0004] However, in some areas of China, the soil moisture content is high and it is difficult to improve the excavated rock and soil, resulting in the screw conveyor and belt conveyor transporting highly fluid thin slag (or even only groundwater). The inventor found that the existing shield machine screw conveyor has a low slag outlet and the belt conveyor has a large downward inclination angle, so the thin slag cannot be transported upward through the belt conveyor, causing the thin slag to flow below the slag outlet, flooding the segment assembly area and affecting the segment assembly operation; at the same time, it is necessary to clean up the thin slag flowing to the slag outlet, which consumes huge manpower and material resources and greatly affects the construction period of the subway. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a screw conveyor for a shield machine, which can improve the slag outlet position of the screw conveyor and reduce the downward inclination angle of the belt conveyor, thereby preventing the thin slag from flowing down and reducing or even avoiding the slag cleaning work.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A screw conveyor for a shield machine comprises a screw arranged upwardly and inclined, wherein the feeding end of the screw is located at the bottom behind the cutter head of the shield machine, a barrel is arranged circumferentially on the screw, a first sleeve is arranged on the barrel at the feeding end of the screw, and a second sleeve is arranged on the barrel at the feeding end of the screw, the barrel is fixedly connected to the screw and the barrel can realize rotation and linear movement relative to the first sleeve and the second sleeve, the first sleeve is provided with a slag outlet, and a set distance is provided between the top of the first sleeve and the assembled pipe segments in the tunnel.

[0008] In the above-mentioned screw conveyor, the screw is located in the barrel, and the barrel drives the screw to rotate and move linearly together. The closed barrel is conducive to the transportation of thin slag. In order for the thin slag to fall smoothly into the belt conveyor, through the arrangement of the first sleeve and the second sleeve, while ensuring the telescopic movement of the screw, there is no need to arrange the mechanism for driving the screw to rotate and telescopic movement at the end of the barrel, which effectively raises the slag outlet height of the screw conveyor, which is conducive to the thin slag being sent out at a higher place, avoiding leakage of the thin slag at the screw discharge end, affecting the assembly of the pipe segments.

[0009] As described above, in a screw conveyor for a shield machine, the second sleeve is arranged behind the shield soil bin door in front of the shield machine, and the second sleeve is fixedly connected to the shield machine, the second sleeve is arranged around the cylinder body, the length of the second sleeve is smaller than the length of the cylinder body, the first sleeve and the second sleeve are arranged opposite to each other, and the second sleeve is fixedly connected to the shield machine, which is conducive to the screw to transport the thin slag from the shield soil bin in front of the shield machine and avoid leakage of the thin slag from the front end of the cylinder body.

[0010] In the screw conveyor for a shield machine as described above, in order to prevent leakage of thin slag from the connection between the first sleeve, the second sleeve and the cylinder, one end of the first sleeve is arranged to wrap around the end of the cylinder, a bearing is arranged between the cylinder and the first sleeve, and the cylinder and the first sleeve are sealed and connected.

[0011] In the screw conveyor for a shield machine as described above, a bearing is arranged between the cylinder and the second sleeve and the cylinder and the second sleeve are sealed and connected, thereby ensuring the rotation of the cylinder relative to the second sleeve and preventing the leakage of slag from the connection between the two;

[0012] In order to allow the screw to penetrate deeply into the soil bin, the feeding end of the screw can exceed the starting end of the second sleeve;

[0013] The length of the cylinder is greater than the length of the first sleeve and greater than the length of the second sleeve, and the length of the cylinder is 6-10 times the length of the first sleeve, which fully ensures the length of the cylinder.

[0014] In the screw conveyor for a shield machine as described above, the vertical distance between the top of the first sleeve and the pipe segment laid in the tunnel is between 5 cm and 10 cm, and the height of the slag outlet is raised to the maximum extent possible while ensuring construction safety;

[0015] In some embodiments, the discharge end of the screw is flush with one end of the barrel;

[0016] In order to raise the slag outlet as high as possible and avoid the belt conveyor being set too tilted, the slag outlet is arranged on the lower side of the first sleeve or the end face away from the cylinder body.

[0017] As described above, in a screw conveyor for a shield machine, the cylinder is connected to a rotating mechanism and a linear drive mechanism respectively; the rotating mechanism is a clamp-type drive mechanism, whereby the cylinder drives the screw to rotate relative to the first sleeve and the second sleeve, and the linear drive mechanism can drive the cylinder to achieve linear movement, driving the cylinder and the screw to penetrate into the front shield soil bin of the shield machine.

[0018] Taking into account the structural arrangement in the shield machine, the rotating mechanism and the linear driving mechanism are both located between the cutter head of the shield machine and the segment assembling machine, and the rotating mechanism and the linear driving mechanism are both fixed by the shield machine.

[0019] In a second aspect, the present invention further provides a shield machine, including the screw conveyor for the shield machine.

[0020] A shield machine as described above includes a belt conveyor, wherein the starting end of the belt conveyor is located below the slag outlet. After the height of the slag outlet is raised, the starting height of the corresponding belt conveyor is also raised, further ensuring that the thin slag can be effectively delivered by the belt conveyor.

[0021] In the shield machine as described above, in order to match the height of the slag outlet of the screw conveyor, the belt conveyor is arranged horizontally, or the starting section of the belt conveyor is arranged inclined upward.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) The present invention provides a first sleeve at the discharge end of the screw conveyor and a slag outlet at the first sleeve, so that the height of the slag outlet is greatly increased, thereby greatly reducing the downward inclination angle of the belt conveyor (even making the belt conveyor horizontal), preventing the thin slag from flowing down, effectively avoiding the influence of the thin slag accumulation on the assembly of the pipe segments, greatly reducing or even avoiding the workload of slag removal, and correspondingly reducing the excavation time of each ring of the shield machine and shortening the construction period.

[0024] 2) The present invention arranges a second sleeve at the feeding end of the screw conveyor, and the first sleeve and the second sleeve are both reliably connected to the barrel, which can effectively ensure that the barrel drives the screw to rotate and linearly telescopically move relative to the first sleeve and the second sleeve, ensure that the feeding end of the screw can penetrate into the front shield soil bin, and ensure that the thin slag can be effectively transported by the screw conveyor; and the arrangement of the second sleeve can also prevent the thin slag from leaking at the feeding end of the screw conveyor.

[0025] 3) In the present invention, the cylinder is connected to the first sleeve and the second sleeve through bearings, and the two are sealed, which effectively ensures the reliability of the connection between the cylinder and the first sleeve and the second sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 A layout diagram of a screw conveyor for a shield machine in one or more embodiments of the present invention;

[0028] Figure 2 For the present invention Figure 1 Middle AA section;

[0029] Figure 3 For the present invention Figure 1 Middle BB section.

[0030] In the figure, 1 is the cutter disc; 2 is the shield shell; 3 is the shield tail brush; 4 is the second sleeve; 5 is the pipe segment; 6 is the clamp type drive; 7 is the pipe segment assembly machine; 8 is the screw; 9 is the barrel; 10 is the slag outlet; 11 is the belt conveyor; and 12 is the first sleeve. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0033] As introduced in the background technology, there is a leakage problem in the prior art when the shield machine screw conveyor transports thin slag. In order to solve the above technical problem, the present invention proposes a shield machine screw conveyor and a shield machine.

[0034] Embodiment 1

[0035] In a typical embodiment of the present invention, reference is made to Figure 1As shown, a screw conveyor for a shield machine includes a screw 8 arranged obliquely upward, the feeding end of the screw 8 is located at the bottom behind the shield machine cutter head 1, a barrel 9 is arranged circumferentially on the screw 8, the barrel 9 is fixedly connected to the screw 8 and the barrel can drive the screw 8 to rotate, a first sleeve 4 is arranged at the discharge end of the screw, the barrel 9 can realize rotation and linear movement relative to the first sleeve 4, the first sleeve 4 is provided with a slag outlet 10, and there is a set distance between the top of the first sleeve 4 and the pipe segment laid in the tunnel.

[0036] Specifically, the first sleeve 4 is supported by the shield shell 2 of the shield machine. Since the first sleeve 4 is arranged at a set distance from the shield machine, a support frame is arranged inside the shield shell 2 to support and fix the first sleeve 4 so that during the rotation of the cylinder body 9, the first sleeve 4 maintains its position unchanged, thereby allowing the thin slag to flow out smoothly from the slag outlet 10 of the first sleeve.

[0037] In order to ensure the height of the slag outlet, there is a set distance between the top of the first sleeve 4 and the pipe segment laid in the tunnel, and the vertical distance is between 5cm-10cm. Therefore, the first sleeve is set as high as possible, and accordingly, the length of the screw is as long as possible.

[0038] In some examples, in order to make full use of the space and raise the slag outlet, the discharge end of the screw needs to be close to the slag outlet 10, and the distance between the discharge end of the screw and the slag outlet is less than 50 mm, so that after the thin slag flows out from the discharge end of the screw, it continues to flow out of the slag outlet along the first sleeve; and the angle between the screw 8 and the bottom plane of the shield shell of the shield machine is between 25°-40°.

[0039] Among them, in some examples, the discharge end of the screw 8 is flush with one end of the barrel. Of course, the discharge end of the screw 8 can also be slightly shorter than or slightly beyond the corresponding end of the barrel 9. The length of the first sleeve is 1 / 10-1 / 6 of the length of the barrel, and the slag outlet is located at a position close to the first sleeve away from the barrel 9, on the lower side of the first sleeve or on the end face away from the barrel, thereby not only ensuring the setting length of the screw, but also fully ensuring that the slag outlet 10 is located at a higher position.

[0040] Furthermore, the cylinder 9 is provided with a second sleeve 12 at the other end away from the first sleeve 4. The second sleeve 12 is arranged behind the shield soil bin door of the shield machine and is fixedly connected to the shield machine. Figure 3 As shown, the second sleeve 12 is arranged around the cylinder 9, and the cylinder 9 can rotate and move relative to the second sleeve 12, the first sleeve 4 and the second sleeve 12 are arranged relatively, and the second sleeve 12 is fixedly connected to the shield machine. The arrangement of the second sleeve is conducive to the screw 8 to transport the thin slag from the front shield soil bin of the shield machine, avoiding the thin slag from leaking from the front end of the cylinder.

[0041] Considering that the second sleeve 12 is located at the bottom end of the barrel 9, in order to avoid leakage of the screw conveyor at the feeding end of the screw 8, an ear can be set at the starting end of the second sleeve 12, and the ear is inclined relative to the second sleeve 12. The ear of the second sleeve 12 is fixedly connected to the shield shell 2 of the shield machine, thereby ensuring the stability and reliability of the second sleeve setting, and further ensuring the sealing at the starting end of the second sleeve, ensuring that the thin slag enters the barrel 9 through the second sleeve 12.

[0042] Regarding the second sleeve, its purpose is to allow the diluted slag to smoothly enter the cylinder body and move upward. The length of the second sleeve can be smaller than the length of the first sleeve.

[0043] In order to realize that the barrel 9 drives the screw 8 to be connected with the rotating mechanism, the rotating mechanism is a clamp-type driving mechanism, whereby the barrel 9 drives the screw 8 to rotate relative to the first sleeve 4 and the second sleeve 12 .

[0044] Specifically, in this embodiment, the clamp-type drive mechanism includes a drive motor (not shown in the figure), which is fixed by the shield shell 2 of the shield machine. The drive motor is connected to the transmission mechanism, and the transmission mechanism includes a first gear connected to the drive motor and a second gear circumferentially mounted on the cylinder 9. The first gear and the second gear are meshed with each other, so that the drive motor drives the rotation of the cylinder and the screw through the two meshing gears, thereby realizing the upward transportation of thin slag or other soil slag materials.

[0045] Of course, it can be understood that in other examples, the transmission mechanism may also be other types of transmission mechanisms.

[0046] Furthermore, the barrel is connected to a linear drive mechanism. In this embodiment, the linear drive mechanism includes a linear drive motor or a hydraulic cylinder, which is supported by the shield machine, and a drive rod of the linear drive motor or the hydraulic cylinder is fixedly connected to the barrel. The linear drive mechanism can drive the barrel and the screw to achieve linear motion relative to the first sleeve and the second sleeve, thereby driving the screw to penetrate into the front shield soil bin of the shield machine, which is conducive to the rapid upward movement of the sludge at the feeding end of the screw.

[0047] Specifically, in order to realize the rotation of the cylinder 9 relative to the first cylinder 4 and the second cylinder 12, a bearing is arranged between the cylinder 9 and the first cylinder 4 and the second cylinder 12 to ensure the rotation of the cylinder 9;

[0048] In order to prevent the leakage of the thin slag from the connection between the first sleeve 4, the second sleeve 12 and the cylinder 9, refer to Figure 2 As shown, one end of the first sleeve 4 is arranged around one end of the cylinder 9, and the cylinder and the first sleeve are sealed and connected.

[0049] Correspondingly, the cylinder 9 and the second sleeve 12 are also sealed and connected;

[0050] Specifically, in some examples, three lip bearing seals are used between the cylinder 9 and the first sleeve 4 and the second sleeve 12 respectively. The three lip bearing seals meet the sealing requirements, can effectively prevent debris from flowing out of the gaps, and can also ensure that the cylinder can rotate relative to the first sleeve and the second sleeve.

[0051] In addition, it should be noted that, under the action of the linear drive mechanism, the feeding end of the screw 8 can penetrate into the front shield soil bin of the shield machine, so that the feeding end of the screw 8 exceeds the starting end of the second sleeve 12, which is conducive to the upward transportation of thin slag or soil slag. The starting end of the second sleeve 12 is fixedly connected to the shield machine, and the second sleeve is inclined upward and fixedly connected to the shield machine, which can effectively close the front shield soil bin of the shield machine and prevent leakage of thin slag at the soil bin.

[0052] In the screw conveyor provided in this embodiment, the screw 8 is located in the barrel 9, and the barrel 9 drives the screw to rotate together. The closed barrel is conducive to the transportation of thin slag. In order for the thin slag to fall smoothly into the belt conveyor, the setting of the first sleeve effectively raises the height of the slag outlet of the screw conveyor, which can relatively raise the height of the feeding end of the belt conveyor, and the setting of the second sleeve is also conducive to the closed discharge end of the barrel, avoiding leakage of thin slag at the screw feeding end; of course, the first sleeve is also conducive to the closure of the discharge end, so that the thin slag can only be discharged from the slag outlet.

[0053] Embodiment 2

[0054] This embodiment provides a shield machine, including the screw conveyor for the shield machine described in the first embodiment.

[0055] The shield machine further comprises a belt conveyor 11 . The starting end of the belt conveyor 11 is located below the slag outlet 10 of the first sleeve.

[0056] Among them, in order to match the height of the slag outlet of the screw conveyor, the belt conveyor 11 is arranged horizontally, so that the horizontal belt conveyor directly conveys the thin slag or soil slag, effectively ensuring that the thin slag is conveyed out, avoiding the workload caused by the leakage of the thin slag;

[0057] Alternatively, in other examples, the starting section of the belt conveyor 11 is tilted upward, and all parts of the belt conveyor except the starting section are horizontally or tilted downward. The specific setting can be made according to actual conditions without mandatory restrictions. In some examples, the angle of the starting section of the belt conveyor relative to the horizontal plane is 0-10°. Although it is tilted, this inclination angle is not the traditional 60-80°. Considering that the thin slag is transported from the screw conveyor at a set speed, even if it is transporting thin slag, it is feasible and will not cause a large amount of thin slag to fail to be transported and flow back.

[0058] Furthermore, a segment assembler 7 for assembling segments for the tunnel is provided in the shield machine. The segment assembler 7 can be specifically installed through the shield shell 2. Considering the installation of various structures in the shield equipment, the rotating mechanism and the linear driving mechanism of the cylinder are located between the segment assembler and the cutter head of the shield machine, which will not affect the setting of the segment assembler and ensure the smooth assembly of the segments.

[0059] It can be understood that a shield tail brush 3 is provided at the other end of the shield machine relative to the cutterhead, and the shield tail brush 3 can contact the assembled pipe segments.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A screw conveyor for a shield machine, characterized in that: It includes a screw rod that is arranged obliquely upward, the feeding end of the screw rod is located at the bottom behind the shield machine cutter head, a barrel is arranged circumferentially on the screw rod, a first sleeve is arranged on the barrel rod at the feeding end of the screw rod, a second sleeve is arranged on the barrel rod at the feeding end of the screw rod, the barrel rod is fixedly connected to the screw rod and the barrel rod can realize rotation and linear movement relative to the first sleeve and the second sleeve, the first sleeve has a slag outlet, and there is a set distance between the top of the first sleeve and the assembled pipe segment in the tunnel, and the vertical distance is between 5cm and 10cm; The second sleeve is arranged behind the front shield door of the shield machine, and the second sleeve is fixedly connected to the shield machine. The second sleeve is arranged around the cylinder, and the cylinder and the second sleeve are also sealed. One end of the first sleeve is arranged around the end of the cylinder, a bearing is arranged between the cylinder and the first sleeve, and the cylinder and the first sleeve are sealed and connected; The cylinder is connected to the rotating mechanism and the linear driving mechanism respectively, so that the cylinder drives the screw to realize rotational motion and linear telescopic motion. The rotating mechanism and the linear driving mechanism are both located between the cutter head of the shield machine and the segment assembly machine. The linear driving mechanism can drive the cylinder to realize linear movement, and drive the cylinder and the screw to penetrate into the front shield soil bin of the shield machine.

2. A screw conveyor for a shield machine according to claim 1, characterized in that: The length of the cylinder is greater than the length of the first sleeve and greater than the length of the second sleeve.

3. The screw conveyor for a shield machine according to claim 1, characterized in that: The vertical distance between the top of the first sleeve and the pipe segment laid in the tunnel is between 5cm and 10cm; The discharge end of the screw is flush with one end of the barrel; The slag outlet is arranged at the lower side of the first sleeve or at the end surface away from the cylinder body.

4. A shield machine, characterized in that: A screw conveyor for a shield machine comprising any one of claims 1 to 3; It also includes a belt conveyor, the starting end of the belt conveyor is located below the slag outlet, and the belt conveyor is horizontally arranged, or the starting section of the belt conveyor is inclined upward.

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