Sealing device of belt type spiral conveyer

Abstract

The invention discloses a sealing device of a belt-type spiral conveyer, which belongs to the technical field of shield tunneling construction, and comprises a spiral blade and a barrel body sleeved outside the spiral blade, a slag discharging channel is formed in a gap between the barrel body and the spiral blade, and the sealing device also comprises a filling part which is provided with a deformation cavity and is arranged on the surface of the spiral blade; the pressure conveying device comprises a rotor and a stator, the rotor is arranged at the tail end of the spiral blade, a center shaft forming the spiral blade rotates along with the spiral blade, and the stator, the rotor and the spiral blade are sequentially connected and internally provided with a pressure conveying channel to pressurize the filling piece and seal the slag discharging channel; the pressure source is connected with the stator. The filling pieces on the surfaces of the spiral blades are pressurized and expanded, the slag discharging channel can be completely closed, the problem that the internal construction environment of the shield tunneling machine is polluted due to muck gushing in water-rich stratum construction of the earth pressure balance shield tunneling machine can be effectively solved, the pressure stability of the earth bin is guaranteed, and then the tunneling safety of equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunneling construction, and in particular to a belt screw conveyor sealing device. Background Art

[0002] The earth pressure balance shield machine uses an axial or belt screw conveyor to take slag from the bottom of the pressurized soil bin and transfer it to the belt conveyor. However, when the earth pressure balance shield machine passes through water-rich strata, the poor improvement of the slag soil leads to a decrease in water-stopping properties, and a large amount of muddy water and slag gushes out from the slag outlet of the screw conveyor. The slag gushing not only pollutes the internal construction environment of the earth pressure balance shield machine, but also may cause a large-scale decrease in the soil bin pressure, resulting in ground subsidence.

[0003] In the prior art, on the one hand, the technologies of slag improvement, double gates, telescopic function of screw conveyor, pressure-maintaining pump, etc. are widely used, but the effect is not good when dealing with gushing; on the other hand, the technologies of extending the slag discharge path such as double screw conveyor, U-shaped sealed screw machine groove, anti-gushing barrel, etc. are used on a small scale. By adding new devices, the intensity of the gushing can be slowed down or reduced, but the effect is limited for gushing with large water pressure. For example, the patent CN204783040U anti-gushing double screw conveyor, the first-stage screw machine and the second-stage screw machine are connected in series to increase the pitch of the screw shaft, but a new first-stage screw machine needs to be added, the structure is complex, and the anti-gushing effect is limited when facing deep buried water-rich strata. Patent CN110541716B U-shaped sealed screw machine anti-gushing system and anti-gushing method that can separate slag and water, adds a sealing box at the slag outlet, and changes the slag discharge from the large-diameter barrel section to the small-diameter mud and water pipeline, which reduces the slag particle size. Patent CN212173542U is a vacuum water-analysis type anti-gushing screw conveyor and shield machine with a new vacuum cylinder section. When encountering water-rich strata, the vacuum water-analysis mechanism only diverts part of the water, and the slag will block the water-analysis holes, the diversion is limited, and most of the mixed slag and water will still be ejected from the rear slag outlet. Patent CN221196160U is an elastic pressure-stabilizing regulating valve and screw machine anti-gushing system. Although an elastic pressure-stabilizing regulating valve is proposed, the elastic pressure-stabilizing regulating valve is set on the mud pipeline, which solves the emergency drainage problem after the screw conveyor gushes. The mud pipeline and the rear slag outlet are respectively at the tail of the screw conveyor and are independent of each other. The gate of the rear slag outlet must be closed when draining water. At this time, the earth pressure balance shield machine stops excavating, and the screw conveyor stops rotating and discharging slag, affecting construction.

[0004] Therefore, it is necessary to design an effectively sealed anti-surge screw conveyor for the construction of belt screw conveyors in water-rich strata. Summary of the invention

[0005] The object of the present invention is to provide a belt screw conveyor sealing device, which can effectively deal with the problem of slag gushing during the construction of an earth pressure balance shield machine in a water-rich stratum.

[0006] In order to achieve the above object, the present invention proposes a belt screw conveyor sealing device, comprising a spiral blade and a cylinder sleeved outside the spiral blade, wherein the gap between the cylinder and the spiral blade forms a slag discharge channel, and further comprising: A filling member having a deformation cavity and arranged on the surface of the spiral blade; The pressure conveying device comprises a rotor and a stator. The rotor is arranged at the end of the spiral blade. The central axis of the spiral blade rotates with the spiral blade. The stator, rotor and spiral blade are connected in sequence and have a pressure conveying channel inside to pressurize the filling member and close the slag discharge channel. A pressure source is connected to the stator.

[0007] Furthermore, the spiral blades with no less than two pitches are arranged with filling pieces.

[0008] Furthermore, the side and center of the spiral blade are both provided with fillers. For example, the side fillers can be provided separately for each spiral blade, so that the inside of the spiral blade is connected and each filler is pressurized separately, or a plurality of spiral blades can be provided with an integral filler, so that the filler can be pressurized by arranging holes inside a spiral blade.

[0009] Furthermore, both the slag facing surface and the slag back surface of the spiral blade side are arranged with filling pieces.

[0010] Furthermore, the filling piece is made of a material with high strength, good wear resistance and the ability to deform, and expands under pressure, such as an airbag, a plastic bag, etc.

[0011] Furthermore, the filling member may be arranged on the surface of the spiral blade in the form of being embedded in the spiral blade, sleeved on the spiral blade, or adhered to the surface of the spiral blade.

[0012] Furthermore, the periphery of the filling member is embedded in the spiral blade, and the filling member is pressed on the spiral blade by a pressing member to form a closed pressure chamber. The pressing member is such as a pressing block, a pressing strip, etc. Preferably, the pressing member is a pressing block, which is embedded in the spiral blade and fixed on the spiral blade by bolts.

[0013] Furthermore, the filling piece and the pressing block interact with each other in a hook shape.

[0014] Furthermore, the pressure source may be a device for conveying gas or a device for conveying liquid. The pressure may be air pressure, water pressure, etc.

[0015] The beneficial effects of the present invention are: In the belt screw conveyor sealing device of the present invention, the filling piece arranged on the side of the spiral blade can expand under the action of pressure to close the side slag discharge channel; the filling piece arranged in the center of the spiral blade can expand under the action of pressure to close the center slag discharge channel; the sealing system composed of the side filling piece and the center filling piece can completely close the slag discharge channel, which can not only effectively deal with the problem of slag gushing and polluting the internal construction environment of the earth pressure balance shield machine during construction in water-rich strata, but also ensure the stability of the soil bin pressure, thereby ensuring the safety of equipment excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main engine slag discharge system structure of the earth pressure balance shield machine; Figure 2 It is a schematic diagram of the sealing device of the belt screw conveyor of the present invention; Figure 3 A schematic diagram of the structure of a single spiral blade provided with a plastic bag according to the present invention; Figure 4 is a cross-sectional view of a single spiral blade of the present invention; Figure 5 It is a structural schematic diagram of the pressure delivery device of the present invention; Figure 6 It is a front view of the side slag discharge channel and the central slag discharge channel of the present invention after the plastic bag is inflated and closed; Figure 7 It is a top view of the side slag discharge channel and the central slag discharge channel of the present invention when the plastic bag is inflated and closed.

[0017] In the figure: 1-soil bin, 2-partition, 3-shield, 4-slag, 5-slag inlet, 6-spiral blade, 7-sealing part, 8-driving part, 9-slag outlet, 10-rubber bag, 101-side rubber bag, 102-center rubber bag, 11-pressing block, 12-back slag surface, 13-front slag surface, 14-pressure conveying device, 141-rotor, 142-stator, 1411-first pressure transmission channel, 601-second pressure transmission channel, 1421-air hole, 15-cylinder, 16-slag discharge channel. DETAILED DESCRIPTION

[0018] The following further describes the structures involved in the present invention or the technical terms used in these descriptions. These descriptions are only used as examples to illustrate how the methods of the present invention are implemented, and cannot constitute any limitation to the present invention.

[0019] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "lateral", "longitudinal", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, unless otherwise clearly specified and limited, "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] This embodiment introduces a belt screw conveyor sealing device, such as Figure 1 As shown, the main slag discharge system of the earth pressure balance shield machine includes a soil bin 1, a partition 2, a shield body 3, slag 4, a slag inlet 5, a spiral blade 6, a sealing part 7, a driving part 8, a slag outlet 9, and a cylinder 15. The partition 2 and the tunnel face form a closed soil bin 1 to balance the soil pressure in front and stabilize the stratum. The belt screw conveyor is installed at the opening at the bottom of the partition 2, takes slag from the pressurized soil bin 1, and continuously reduces it to normal pressure, and sends the slag 4 out of the slag outlet 9 at normal pressure. The belt screw conveyor includes a spiral blade 6, a sealing part 7, and a driving part 8. The driving part 8 is installed at the tail of the belt screw conveyor to drive the spiral blade 6 to rotate and take soil from the soil bin 1.

[0022] like Figure 2 As shown, the belt screw conveyor does not contain a central shaft, but only has a spiral blade 6. The gap between the cylinder 15 and the spiral blade 6 located inside the cylinder 15 forms a slag discharge channel 16. The sealing part 7 is modified for the spiral blade 6 with two pitches, and a plastic bag 10 is embedded on its surface, including a side plastic bag 101 and a center plastic bag 102. The side plastic bag 101 is attached to the side of the spiral blade 6, and the center plastic bag 102 is attached to the inner side of the rotation center of the spiral blade 6. The front and rear two plastic bags 10 expand after being pressurized and squeeze each other, which has a better sealing effect on the slag discharge channel.

[0023] like Figure 2 As shown, the back slag surface 12 and the front slag surface 13 of the spiral blade 6 are both arranged with plastic bags 10, that is, the sides of the spiral blades 6 of two pitches are continuously covered with side plastic bags 101 along the axial direction, forming an effective closure of the side slag discharge channel.

[0024] like Figure 3-5 As shown, the plastic bag 10 has a cavity inside, which is expanded by filling gas through the pressure conveying device 14. The pressure conveying device 14 includes a rotor 141 and a stator 142. The rotor 141 is arranged at the end of the spiral blade 6, that is, the end close to the slag outlet 9. The rotor 141 constitutes the central axis of the spiral blade 6 and rotates with the spiral blade 6. The stator 142 is stationary and arranged outside the rotor 141. The rotor 141 has a first pressure transmission channel 1411, the spiral blade 6 has a second pressure transmission channel 601, and the stator 142 has an air hole 1421. The air hole 1421, the first pressure transmission channel 1411, and the second pressure transmission channel 601 are connected in sequence. The pressure source is connected to the air hole 1421 inside the stator 142 to inflate the plastic bag 10 to make it expand.

[0025] like Figure 4 As shown, the periphery of the plastic bag 10 is embedded in the spiral blade 6, and is connected to the second pressure delivery channel 601 inside the spiral blade 6. A pressing block 11 is provided to press the plastic bag 10, and the pressing block 11 is embedded in the spiral blade and fixed to the spiral blade 6 by bolts. Under the action of the pressing block 11, the plastic bag 10 is closely attached to the spiral blade 6, ensuring that it will not be separated from the action of the pressing block 11 under the internal pressure condition. In order to further compress the plastic bag 10, the plastic bag 10 and the pressing block 11 interact with each other in a hook shape.

[0026] In the belt screw conveyor sealing device of the present invention, the side plastic bag 101 embedded in the side of the spiral blade 6 is squeezed with the side plastic bag 101 of the previous spiral blade 6 under continuous inflation to close the side slag discharge channel; the central plastic bag 102 embedded in the rotating center of the spiral blade 6 expands and squeezes with the central plastic bag 102 of the previous spiral blade 6 to close the central slag discharge channel. The sealing system composed of the side plastic bag 101 and the central plastic bag 102 can completely close the slag discharge channel 16, which can not only effectively deal with the problem of slag gushing and polluting the internal construction environment of the shield machine during the construction of the earth pressure balance shield machine in water-rich strata, but also ensure the stability of the soil bin pressure, thereby ensuring the safety of equipment excavation.

[0027] Under normal formation conditions, the pressure source is not started, and the plastic bag 10 is tightly attached to the surface of the spiral blade 6 under the action of the pressure block 11; when it is detected that the formation is rich in water, the pressure source is started, the side plastic bag 101 and the center plastic bag 102 are pressurized and expanded to fill the slag discharge channel 16, effectively coping with the gushing problem of the belt screw conveyor in water-rich formations, especially water-rich sand and gravel formations.

[0028] The working process of the belt screw conveyor sealing device of the present invention is as follows: Figure 6 , Figure 7 As shown: S1: The spiral blade 6 is rotated to remove slag under the action of the rear driving part 8; S2: It is detected that the stratum is rich in water, and the inside of the plastic bag 10 is inflated and continues to expand; S3: The side plastic bag 101 continues to expand and adheres closely to the side plastic bag 101 of the spiral blade 6 of the previous pitch, closing the side slag discharge channel; S4: The central plastic bag 102 continues to expand and adheres closely to the central plastic bag 102 of the spiral blade 6 of the previous pitch, closing the central slag discharge channel.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A belt screw conveyor sealing device, comprising a spiral blade and a cylinder sleeved outside the spiral blade, wherein the gap between the cylinder and the spiral blade forms a slag discharge channel, characterized in that: Also includes: A filling member having a deformation cavity and arranged on the surface of the spiral blade; The pressure conveying device comprises a rotor and a stator. The rotor is arranged at the end of the spiral blade. The central axis of the spiral blade rotates with the spiral blade. The stator, rotor and spiral blade are connected in sequence and have a pressure conveying channel inside to pressurize the filling member and close the slag discharge channel. A pressure source is connected to the stator.

2. The belt screw conveyor sealing device according to claim 1, characterized in that: The spiral blades with no less than two pitches are all arranged with filling pieces.

3. The belt screw conveyor sealing device according to claim 1, characterized in that: The side and center parts of the spiral blades are both arranged with filling pieces.

4. The belt screw conveyor sealing device according to claim 3, characterized in that: The slag facing surface and the slag back surface of the spiral blade side are both arranged with filling pieces.

5. The belt screw conveyor sealing device according to claim 1, characterized in that: The filling piece is arranged on the surface of the spiral blade in the following forms: the filling piece is embedded in the spiral blade, or is sleeved on the spiral blade, or is adhered to the surface of the spiral blade.

6. The belt screw conveyor sealing device according to claim 5, characterized in that: The periphery of the filling piece is embedded in the spiral blade, and the filling piece is pressed on the spiral blade by a pressing piece to form a closed pressure chamber.

7. The belt screw conveyor sealing device according to claim 6, characterized in that: The pressing piece is a pressing block, which is embedded in the spiral blade and fixed on the spiral blade by bolts.

8. The belt screw conveyor sealing device according to claim 7, characterized in that: The filling piece and the pressing block interact with each other in a hook shape.

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