Flexible tensioning type spiral shaft sealing device

Abstract

The invention discloses a flexible tensioning type spiral shaft sealing device, which relates to the technical field of shield tunneling construction, and comprises an optical shaft and a smooth shaft section arranged at the middle section of a spiral shaft, the cylinder body is sleeved outside the polished shaft, and a slag discharging channel is formed between the cylinder body and the polished shaft; the sealing piece is sleeved between the cylinder body and the polished shaft and can be expanded in the radial direction of the cylinder body to seal the slag discharging channel; and the rope can be used for elastically folding and unfolding the sealing piece. According to the invention, the unthreaded shaft section is not welded with a spiral blade, muck is not influenced by a lead angle at the unthreaded shaft section, and the muck can be passively extruded at the unthreaded shaft section to form a soil plug effect, so that a certain water gushing blocking effect is achieved; when necessary, the head end and the tail end of the rope can be tensioned outside the barrel body, the sealing piece is unfolded to seal the slag discharging channel, the purpose of completely blocking gushing water is achieved, the problem that the internal construction environment of the earth pressure balance shield machine is polluted by muck gushing in the water-rich stratum construction of the earth pressure balance shield machine can be effectively solved, the pressure stability of an earth bin is guaranteed, and the service life of the earth pressure balance shield machine is prolonged. And the tunneling safety of equipment is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunneling construction, and in particular to a flexible tensioning spiral shaft 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, for the construction of shaft screw conveyors in water-rich strata, it is necessary to design an anti-surge screw conveyor with an effectively sealed screw shaft. Summary of the invention

[0005] The object of the present invention is to provide a flexible tensioning spiral shaft 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, a flexible tensioning spiral shaft sealing device of the present invention comprises: The optical axis is a smooth shaft section arranged in the middle section of the spiral shaft; A cylinder body is sleeved outside the optical axis, and a slag discharge channel is formed between the cylinder body and the optical axis; A closing member, arranged inside the cylinder, which can be expanded radially along the cylinder to close the slag discharge channel; The rope can elastically retract and expand the closure.

[0007] Furthermore, the closure is double-sided foldable, the cylinder is connected to the front section cylinder through the front flange, and is connected to the rear section cylinder through the rear flange, and the front and rear faces of the closure are respectively pressed at the connection between the front flange and the rear flange under the action of connecting bolts; or, the front and rear faces of the closure are adhered to the inner wall of the cylinder and fixed to the cylinder by bolts; or, the front and rear faces of the closure are embedded in the cylinder and fixed to the cylinder by bolts.

[0008] Alternatively, the closure is folded on both sides, the cylinder is connected to the joint cylinder through a flange, and the front and back faces of the closure are fixed at the same flange connection and are compressed by the action of connecting bolts; alternatively, the front and back faces of the closure are pasted to the same position of the inner wall of the cylinder and fixed by bolts; alternatively, the front and back faces of the closure are embedded in the same position of the cylinder and fixed by bolts.

[0009] Alternatively, the closure is single-sided, the cylinder is connected to the joint cylinder through a flange, and the outside of the closure is fixed at the flange connection and is tightened by the action of the connecting bolts; alternatively, the outside of the closure is adhered to the inner wall of the cylinder and fixed by bolts; alternatively, the outside of the closure is embedded in the cylinder and fixed by bolts.

[0010] Furthermore, when the closure is double-sided folded, the rope is located between the cylinder and the closure, and the head and tail ends cross and then pass through the inside of the cylinder, or, after the head and tail ends of the rope cross, the head end (tail end) passes through the inside of the cylinder, and the tail end (head end) is fixed on the inner wall of the cylinder; when the closure is single-sided, the inner side of the closure has a drawstring, and the head and tail ends of the rope cross, pass through the drawstring and pass through the inside of the cylinder.

[0011] Furthermore, the end of the rope is connected to a tensioning device, such as hydraulic tensioning, winch tensioning, manual tensioning, etc.

[0012] Furthermore, the rope is provided with a self-locking mechanism, which includes a wedge-shaped male head and a wedge-shaped female head. The wedge-shaped male head includes a base, and the lower end of the base is provided with an inverted cone structure surrounded by elastic connecting plates. An entry hole passes through the center of the wedge-shaped male head. The wedge-shaped female head includes a front sleeve and a conical rear sleeve connected to the front sleeve. The wedge-shaped female head is sleeved on the outside of the wedge-shaped male head, the front sleeve is adapted to the base, and the rear sleeve is adapted to the inverted cone structure.

[0013] Furthermore, the closure member is made of a high-strength, wear-resistant, and deformable material, such as a plastic bag, an air bag, etc. The shape of the closure member can be cylindrical, square column, etc.

[0014] Furthermore, the rope is a long strip with soft characteristics and has properties such as high strength and wear resistance, such as fiber rope, woven from fibers such as hemp, palm, polypropylene, polyester, cotton yarn, nylon, etc.; metal rope, made of metals such as steel; chain made of metal, etc.

[0015] The beneficial effects of the present invention are: In the flexible tensioned spiral shaft sealing device of the present invention, the middle section of the spiral shaft without welding spiral blades is selected as the smooth shaft section. The slag in the smooth shaft section is not affected by the spiral lead angle and can be passively squeezed in the smooth shaft section to form a soil plug effect, which plays a certain role in blocking water gushing.

[0016] In the flexible tensioning spiral shaft sealing device of the present invention, the head and tail ends of the tensioned rope can be stretched outside the cylinder, and the sealing piece is continuously expanded to close the slag discharge channel, thereby achieving the purpose of completely blocking the water gushing. This 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.

[0017] In the flexible tensioning spiral shaft sealing device of the present invention, the closure can stop at any position depending on the degree of rope tension, so the degree of rope tension can be adjusted as needed, the size of the slag discharge channel can be dynamically adjusted, and then the size of the slag discharge port can be adjusted according to the soil bin pressure requirement.

[0018] In the flexible tensioning spiral shaft sealing device of the present invention, slag discharge is completed by dynamically adjusting the size of the slag discharge channel, the rear slag discharge port does not need to be closed, and the earth pressure balance shield machine does not need to stop excavation, so that continuous construction can be achieved.

[0019] In the flexible tensioned spiral shaft sealing device of the present invention, the soil bin excavated by the cutter disc is in a pressurized state. After the slag is transported and depressurized by the screw conveyor, it becomes conveyed at normal pressure. Compared with the continuous spiral blades on the spiral shaft, the spaced spiral blades of the present invention can play a role of step-by-step pressure reduction.

[0020] In the flexible tensioning spiral shaft sealing device of the present invention, the rope is provided with a self-locking mechanism, and does not require a rear air source or a hydraulic pump station to continuously provide power. In addition, the components are small in size and are suitable for situations where the internal space of the shield is narrow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main engine slag discharge system structure of the earth pressure balance shield machine; Figure 2 This is a schematic structural diagram of the spiral shaft sealing device of Example 1; Figure 3 This is a schematic diagram of the structure of the plastic bag in Example 1 being sleeved on the outside of the optical axis; Figure 4 This is a schematic diagram of the structure of the steel wire rope tensioning in Example 1; Figure 5 This is a schematic diagram of the structure in which the plastic bag is closely attached to the inner wall of the cylinder in Example 1; Figure 6 This is a schematic structural diagram of the self-locking mechanism of Example 1; Figure 7 This is a schematic structural diagram of a wedge-shaped male head in Example 1; Figure 8 This is a schematic structural diagram of a wedge-shaped female head in Example 1; Fig. 9 This is a structural schematic diagram of Example 1 in which the steel wire rope is gradually tightened and the plastic bag is gradually unfolded; Fig.10 This is a structural schematic diagram of Example 1 in which a plastic bag presses the optical axis and closes the slag discharge channel; Fig.11 This is a structural schematic diagram of Embodiment 2 (the plastic bag is double-sided folded, and the front and back sides of the plastic bag are fixed at the same flange connection); Fig.12 This is a schematic diagram of the structure of Example 3 (the plastic bag is in a single-sided form, and the plastic bag is embedded in the cylinder and fixed to the inner wall of the cylinder by bolts); Fig.13 This is a schematic diagram of the structure of Example 4 (the front and rear faces of the plastic bag are embedded in the cylinder and fixed to the inner wall of the cylinder by bolts); Fig.14 This is a schematic diagram of the structure of Example 5 (the tensioning device adopts a hydraulic press).

[0022] In the figure: 1-soil bin, 2-partition, 3-shield, 4-main drive box, 5-slag, 6-slag inlet, 7-screw shaft, 701-front blade segment, 702-middle bladeless segment (optical axis), 703 rear blade segment, 8-sealing part, 801-front flange, 802-cylinder, 803-rear flange, 804-plastic bag, 805-wire rope, 806-hydraulic press, 9-driving part, 10-slag outlet, 11-slag outlet channel, 12-front section cylinder, 13-rear section cylinder, 14-self-locking mechanism, 141-wedge-shaped male head, 142-wedge-shaped female head, 1411-base, 1412-elastic connecting plate, 1413-entry hole, 1421-front sleeve, 1422-rear sleeve. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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. Example 1

[0026] This embodiment introduces a flexible tensioning spiral shaft sealing device, such as Figure 1As 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, a main drive box 4, slag 5, a slag inlet 6, a screw shaft 7, a sealing part 8, a drive part 9, and a slag outlet 10. The partition 2 of the earth pressure balance shield machine forms a closed soil bin 1 with the tunnel face, balancing the soil pressure in front and playing a role in stabilizing the stratum. The main drive box 4 is installed on the upper part of the partition 2 to drive the cutter shaft to rotate. The shaft screw conveyor is installed at the opening at the lower part of the partition 2 to take slag from the soil bin 1 filled with pressure, and continuously reduce it to normal pressure, and send the slag 5 out of the slag outlet 10 at normal pressure. The shaft screw conveyor includes a screw shaft 7, a sealing part 8, and a drive part 9. The drive part 9 is installed at the tail of the shaft screw conveyor to drive the screw shaft 7 to rotate and take soil from the soil bin 1.

[0027] like Figure 2 As shown, the spiral shaft 7 includes a front blade segment 701, a middle bladeless segment (optical axis) 702, and a rear blade segment 703; the slag 5 can enter from the front blade segment 701, move to the rear under the push of the spiral blades, and form a soil plug in the optical axis segment 702. The middle section of the spiral shaft without welding spiral blades is selected as the optical axis segment. The original slag cut by the cutter head is improved to form fluid plastic slag. In the optical axis segment 702, there is no active transportation of spiral blades, and a large amount of slag will accumulate here, eventually forming a soil plug effect, which plays a certain role in blocking water inrush. The slag is still fluid here, the earth pressure balance shield machine is still excavating, the screw conveyor is still continuously conveying slag, and the front of the optical axis segment 702 is still accumulating slag. The front pressure will squeeze the slag at the rear of the optical axis segment 702 into the next section of spiral blades, and then transport it to the slag outlet. Moreover, the soil bin excavated by the cutter disc is in a pressurized state. After the slag is transported and depressurized by the screw conveyor, it becomes transported at normal pressure. Compared with the continuous spiral blades on the spiral shaft, the intermittent spiral blades in this embodiment can play a role in step-by-step pressure reduction.

[0028] like Figure 2 As shown, the sealing part 8 includes a front flange 801, a cylinder 802, a rear flange 803, a plastic bag 804, and a steel wire rope 805. The cylinder 802 is sleeved on the outside of the optical axis 702, and a slag discharge channel 11 is formed between the cylinder 802 and the optical axis 702. The plastic bag 804 can change the size of the slag discharge channel 11 as the steel wire rope 805 is relaxed or tightened. When the steel wire rope 805 is tightened, the plastic bag 804 completely clings to the smooth optical axis 702, closing the slag discharge channel 11. The slag discharge is completed by dynamically adjusting the size of the slag discharge channel 11, and the rear slag discharge port does not need to be closed, and the earth pressure balance shield machine does not need to stop excavation, so continuous construction can be achieved.

[0029] like Figure 2 As shown, the cylinder 802 is connected to the front cylinder 12 of the shaft screw conveyor through the front flange 801, and is connected to the rear cylinder 13 of the shaft screw conveyor through the rear flange 802.

[0030] like Figure 2-5 As shown, the cylinder 802 adopts an integral structure, and the plastic bag 804 is a double-sided folded form, also an integral structure, cylindrical, close to the inner wall of the cylinder 802, and is compressed by the connecting bolts at the connection between the front flange 801 and the rear flange 802 to form a seal. The steel wire rope 805 is sleeved in the gap between the plastic bag 804 and the cylinder 802, and the head and tail ends are crossed and then passed through the inside of the cylinder 802, and are manually tensioned and self-locked by the self-locking mechanism 14.

[0031] like Figure 6-8 As shown, the self-locking mechanism 14 includes a wedge-shaped male head 141 and a wedge-shaped female head 142. The wedge-shaped male head 141 includes a base 1411. The lower end of the base 1411 is provided with an inverted cone structure surrounded by elastic connecting plates 1412. A penetration hole 1413 is passed through the center of the wedge-shaped male head 141, that is, the center of the base 1411 is connected with the center of the inverted cone structure for the wire rope 805 to pass through. The wedge-shaped female head 142 includes a front sleeve 1421 and a conical rear sleeve 1422 connected to the front sleeve 1421. The wedge-shaped female head 142 is sleeved on the outside of the wedge-shaped male head 141. The front sleeve 1421 is adapted to the base 1411, and the rear sleeve 1422 is adapted to the inverted cone structure. When the wire rope 805 is tensioned to the required length, the wedge-shaped male head 141 will move toward the conical rear sleeve 1422 of the wedge-shaped female head 142 under the friction of the wire rope 805; the conical rear sleeve 1422 will continuously press the inverted conical structure of the wedge-shaped male head 141. Since the inverted conical structure can be elastically deformed, it will continuously shrink inward under the pressure of the wedge-shaped female head 142, thereby continuously pressing the wire rope 805, resulting in greater friction. The greater friction will drive the wedge-shaped male head 141 to continue to move toward the wedge-shaped female head 142, and the wedge-shaped female head 142 will continue to press the inverted conical structure of the wedge-shaped male head 141 to move toward the circular conical rear sleeve, and continue to press the wire rope 805 until the wire rope 805 is locked. The cylinder 802 is provided with a mounting hole, and the self-locking mechanism 14 is placed in the mounting hole to reduce the occupied space outside the cylinder 702.

[0032] To replace the worn plastic bag 804, the spiral shaft needs to be pulled out from the soil bin 1 and the sealing part 8 needs to be removed for replacement.

[0033] In this embodiment, the middle section of the spiral shaft without the spiral blades welded therein is selected as the optical axis section 702. The original slag cut off by the cutter disc is improved to form fluid plastic slag. In the optical axis section 702, there is no active conveying of the spiral blades. A large amount of slag will accumulate here, and eventually form a soil plug effect, which plays a certain role in blocking water inrush. The slag is still fluid here, the earth pressure balance shield machine is still excavating, the screw conveyor is still continuously conveying slag, and the front of the optical axis section 702 is still accumulating slag. The pressure at the front will squeeze the slag at the rear of the optical axis section 702 into the next section of spiral blades, and then transport it to the slag outlet.

[0034] In this embodiment, the plastic bag 804 can change the size of the slag discharge channel 11 as the steel wire rope 805 is relaxed or tightened, and the size of the slag discharge port is adjusted according to the soil bin pressure requirement. The steel wire rope 805 is gradually tightened, the plastic bag 804 is gradually expanded, and the slag discharge channel 11 is gradually reduced until the plastic bag 804 is completely close to the optical axis 702, closing the slag discharge channel 11, achieving the purpose of completely blocking water gushing, which can effectively deal with the problem of gushing of the axial screw conveyor during the construction of the earth pressure balance shield machine in the water-rich stratum.

[0035] In this embodiment, the wire rope 805 is provided with a self-locking mechanism 14, which does not require a rear air source or a hydraulic pump station to continuously provide power, and the size of the components is small, which is suitable for Figure 1 The main drive box 4 shown in the figure occupies a huge space while the space inside the shield is narrow.

[0036] The working process of the flexible tensioning spiral shaft sealing device of this embodiment is as follows: Figure 5 , 9 、10 as shown: S1: The screw shaft 7 is rotated to remove slag under the action of the rear driving part 9; S2: It is detected that the formation is rich in water, the steel wire rope 805 is manually tensioned, the plastic bag 804 is unfolded, and the slag discharge channel 11 is reduced; S3: As the steel wire rope 805 is continuously tightened, the plastic bag 804 is gradually unfolded, and the slag discharge channel 11 is gradually reduced; S4: When the steel wire rope 805 is fully tensioned, the plastic bag 804 presses the optical axis 702 and completely closes the slag discharge channel 11. Example 2

[0037] The difference between this embodiment and embodiment 1 is that the plastic bag 804 is double-sided folded, the cylinder 802 is connected to the cylinder by a flange, the front and back of the plastic bag 804 are fixed at the same flange connection, and are compressed by the action of the connecting bolts, and the wire rope 805 is located between the cylinder 802 and the plastic bag 804, and the head and tail ends are crossed and then pass through the inside of the cylinder 802, see Fig.11 . The rest is the same as Example 1. Example 3

[0038] The difference between this embodiment and embodiment 1 is that the plastic bag 804 is in a single-sided form, the plastic bag 804 is embedded in the cylinder 802 and fixed to the inner wall of the cylinder 802 by bolts, the inner side of the plastic bag 804 has a tie opening, and the head and tail ends of the steel wire rope 805 cross through the tie opening and pass through the inside of the cylinder 802, see Fig.12 . The rest is the same as Example 1. Example 4

[0039] The difference between this embodiment and embodiment 1 is that the front and rear faces of the plastic bag 804 are embedded in the cylinder 802 and fixed to the inner wall of the cylinder 802 by bolts, and the wire rope 805 is located between the cylinder 802 and the plastic bag 804, and the head and tail ends cross and then pass through the inside of the cylinder 802, see Fig.13 . The rest is the same as Example 1. Example 5

[0040] The difference between this embodiment and embodiment 1 is that the tensioning device uses a hydraulic press 806, and the head and tail ends of the wire rope 805 are respectively connected to the hydraulic press 806 for tensioning to ensure that the plastic bag 804 is stably stressed. Fig.14 . The rest is the same as Example 1.

[0041] 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 flexible tensioning spiral shaft sealing device, characterized in that: include: The optical axis is a smooth shaft section arranged in the middle section of the spiral shaft; A cylinder body is sleeved outside the optical axis, and a slag discharge channel is formed between the cylinder body and the optical axis; A closing member, arranged inside the cylinder, which can be expanded radially along the cylinder to close the slag discharge channel; A cord can be used to elastically retract and expand the closure.

2. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The closure is foldable on both sides, the cylinder is connected to the front section cylinder through the front flange, and is connected to the rear section cylinder through the rear flange, and the front and rear faces of the closure are respectively pressed at the connection between the front flange and the rear flange under the action of connecting bolts; or, the front and rear faces of the closure are pasted on the inner wall of the cylinder and fixed to the cylinder through bolts; or, the front and rear faces of the closure are embedded in the cylinder and fixed to the cylinder through bolts; or, the closure is foldable on both sides, the cylinder is connected to the section cylinder through the flange, and the front and rear faces of the closure are fixed at the same flange connection and are pressed under the action of connecting bolts; or, the front and rear faces of the closure are pasted on the same position of the inner wall of the cylinder and fixed by bolts; or, the front and rear faces of the closure are embedded in the same position of the cylinder and fixed by bolts.

3. The flexible tensioning spiral shaft sealing device according to claim 2, characterized in that: The rope is located between the cylinder and the closure, and passes through the cylinder after the head and tail ends cross; or, after the head and tail ends of the rope cross, the head end or the tail end passes through the cylinder, and the tail end or the head end is fixed to the inner wall of the cylinder.

4. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The closure is single-sided, the cylinder is connected to the joint cylinder through a flange, the outside of the closure is fixed at the flange connection and is compressed by the action of the connecting bolts; or, the outside of the closure is adhered to the inner wall of the cylinder and fixed by bolts; or, the outside of the closure is embedded in the cylinder and fixed by bolts.

5. The flexible tensioning spiral shaft sealing device according to claim 4, characterized in that: The inner edge of the closure is provided with a tie opening, and the head and tail ends of the rope cross and pass through the tie opening and pass out from the inside of the cylinder.

6. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The end of the rope is connected with a tensioning device, and the tensioning device adopts a hydraulic press or a winch.

7. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The rope is provided with a self-locking mechanism, which includes a wedge-shaped male head and a wedge-shaped female head. The wedge-shaped male head includes a base, and the lower end of the base is provided with an inverted cone structure surrounded by elastic connecting plates. An entry hole passes through the center of the wedge-shaped male head. The wedge-shaped female head includes a front sleeve and a conical rear sleeve connected to the front sleeve. The wedge-shaped female head is sleeved on the outside of the wedge-shaped male head, the front sleeve is adapted to the base, and the rear sleeve is adapted to the inverted cone structure.

8. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The sealing member is a plastic bag or an air bag.

9. The flexible tensioning spiral shaft sealing device according to claim 1, characterized in that: The rope is a fiber braided rope, or a metal rope, or a chain made of metal.

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