Anti-gushing device of screw conveyer

Abstract

The utility model relates to the technical field of shield tunneling machines, in particular to an anti-gushing device of a screw conveyer, the screw conveyer is provided with a conveying pipe and a screw conveying shaft, and a pressure relief mechanism is arranged on the pipe wall of one end, close to a feeding port, of the conveying pipe and is correspondingly connected with a conveying pump so as to discharge water gushing into the conveying pipe out of the screw conveyer; the cooling mechanism is arranged in the middle of the conveying pipe and used for cooling and condensing sludge in the conveying pipe. The pressure relief mechanism is arranged, internal pressure relief can be carried out when the spiral conveyor is not used for conveying sludge, the internal pressure intensity is prevented from being too large, meanwhile, the cooling mechanism is adopted for cooling internal sludge, a waterproof curtain wall is formed, water is prevented from permeating to the discharging opening, and therefore the gushing phenomenon is reduced to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield machines, and in particular relates to a screw conveyor anti-surge device. Background Art

[0002] Existing shield machines generally discharge slag through screw conveyors. When the screw conveyors are not discharging slag, groundwater in water-rich strata will slowly penetrate into the tail of the screw conveyors. When the gate of the screw conveyor discharge port is opened for the next excavation construction, the slag and accumulated water in the screw conveyors will gush out instantly under the action of water pressure. It is necessary to manually clean the slag accumulated on the belt and the slag splashed on the segments, and wait for the water pressure to decrease before excavation construction can be carried out, which seriously affects the construction environment and construction progress. In addition, the gushing water may also cause shutdown accidents caused by sudden damage to the running equipment, greatly increasing the probability of potential accidents.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art. The utility model provides a screw conveyor anti-surge device.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A screw conveyor anti-surge device, comprising:

[0007] A screw conveyor, wherein the screw conveyor has a conveying pipe and a screw conveying shaft;

[0008] A pressure relief mechanism, which is arranged on the pipe wall of the conveying pipe near the feed inlet and is correspondingly connected to a conveying pump to discharge the water flowing into the conveying pipe out of the screw conveyor;

[0009] A cooling mechanism, which is arranged in the middle of the conveying pipe and is used to cool and condense the sludge inside the conveying pipe;

[0010] The conveying pipe includes a first tube body and a second tube body connected by a sleeve, the pressure relief mechanism and the cooling mechanism are respectively arranged at both ends of the first tube body, a tapered sleeve is provided in the inner cavity of one end of the second tube body close to the sleeve, and a spiral blade with a reduced outer diameter is provided on the spiral conveying shaft at the tapered sleeve part.

[0011] Preferably, the pressure relief mechanism comprises:

[0012] A plurality of pressure relief holes are evenly distributed along the axial direction of the delivery pipe;

[0013] A liquid collecting cover, the liquid collecting cover is correspondingly buckled on the outer wall of the delivery pipe to connect the plurality of pressure relief holes;

[0014] The first end of the delivery pump is correspondingly connected to the liquid collecting cover through a connecting pipe, and the second end of the delivery pump extends to the liquid collecting tank through the connecting pipe.

[0015] Preferably, the delivery pump is a bidirectional delivery pump, and the second end of the delivery pump is correspondingly connected to the bentonite solution production equipment through a three-way solenoid valve.

[0016] Preferably, the spiral conveying shaft comprises two sections adapted to the conveying pipe, and the two sections of the spiral conveying shaft are connected in a detachable manner.

[0017] Preferably, a driving motor is provided at one end of the second tube body away from the first tube body, and the driving motor is correspondingly connected to the spiral conveying shaft.

[0018] Preferably, a square shell is provided at one end of the second tube body away from the feed port, a discharge port is provided at the side of the square shell, and a gate valve is provided at the discharge port.

[0019] Preferably, the cooling mechanism, screw conveyor and pressure relief mechanism are connected to controllers accordingly.

[0020] Beneficial effect: A pressure relief mechanism is provided to relieve internal pressure when the screw conveyor is not used to transport the sludge, thereby avoiding excessive internal pressure. At the same time, a cooling mechanism is used to cool the internal slurry to form a water-proof curtain wall to prevent water from penetrating to the discharge port, thereby minimizing the occurrence of gushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0022] Figure 1 This is a schematic diagram of the structure of the anti-spurting device in the specific embodiment provided by the utility model;

[0023] Figure 2 This is a schematic diagram of the assembly of the spiral conveying shaft in the specific embodiment provided by the utility model.

[0024] In the figure: 1. conveying pipe; 2. gate valve; 3. driving motor; 4. cooling chamber; 5. liquid nitrogen tank; 6. conveying pump; 7. controller; 8. three-way solenoid valve; 9. bentonite solution production equipment; 10. liquid collecting cover; 11. spiral conveying shaft; 12. casing; 13. conical sleeve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0026] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0028] like Figure 1-2 As shown, a screw conveyor anti-surge device includes a screw conveyor, a pressure relief mechanism and a cooling mechanism, wherein the screw conveyor has a conveying pipe 1 and a screw conveying shaft 11, the conveying pipe 1 is a metal pipe, used for mud and slag transmission, and a screw conveying shaft 11 is arranged in the conveying pipe 1, and the screw conveying shaft 11 uses external spiral blades to drive the mud and slag to move during rotation.

[0029] The pressure relief mechanism is arranged on the pipe wall of the conveying pipe 1 near one end of the feed port, and is correspondingly connected to a conveying pump 6. The pressure relief mechanism is started when the screw conveyor is not transporting sludge. Specifically, when water flows into the conveying pipe 1, the pressure relief mechanism directly discharges the water flowing into the conveying pipe 1 out of the screw conveyor, thereby avoiding the problem of gushing at the discharge port. Furthermore, in order to further achieve blocking, a cooling mechanism is also arranged in the middle of the conveying pipe 1. The cooling mechanism can be a liquid nitrogen cooling mechanism, which can cool and condense the sludge inside the conveying pipe 1, thereby preventing water from penetrating into the discharge port when not in use.

[0030] In an optional embodiment, the cooling mechanism includes a liquid nitrogen tank 5, an electromagnetic control valve and a cooling chamber 4. The cooling chamber 4 is an annular metal cavity that is sleeved on the outer wall of the conveying pipe 1. Since the conveying pipe 1 is made of metal, it can conduct heat inward to cool the internal sludge, thereby forming a seal. On the one hand, water cannot continue to penetrate, and on the other hand, the penetrated water is discharged through the pressure relief mechanism to avoid excessive pressure inside the screw conveyor.

[0031] In an optional embodiment, the pressure relief mechanism includes a pressure relief hole and a liquid collecting cover 10. There may be multiple pressure relief holes, and the multiple pressure relief holes are evenly distributed in a row along the axial direction of the delivery pipe 1. The liquid collecting cover 10 is a strip cover, which is correspondingly snapped on the outer wall of the delivery pipe 1 and sealed with the delivery pipe 1 by welding, so that the multiple pressure relief holes are connected, and the infiltrated water is discharged to the liquid collecting cover 10 through the pressure relief holes. The first end of the delivery pump 6 is correspondingly connected to the liquid collecting cover 10 through a connecting pipe, and the second end of the delivery pump 6 extends to the liquid collecting tank through a connecting pipe, so that the water in the liquid collecting cover 10 is discharged and collected in time to avoid damage to the equipment and the environment.

[0032] In this embodiment, a filter screen corresponding to the pressure relief hole can be provided on the outer wall of the delivery pipe 1 , and a pressure sensor is provided in the liquid collecting cover 10 to detect the internal pressure in time, thereby starting the delivery pump 6 .

[0033] Furthermore, the delivery pump 6 is a bidirectional delivery pump, which can realize bidirectional liquid delivery from the first end to the second end and from the second end to the first end. The second end of the delivery pump 6 is connected to the bentonite solution production equipment 9 through the three-way solenoid valve 8. The delivery pump 6 cooperates with the switching of the three-way solenoid valve 8 to start the delivery pump 6 to supply the bentonite solution when the mud is being transported. When the mud is not being transported, the delivery pump 6 is used to control the internal pressure of the screw conveyor.

[0034] In order to improve the sealing effect after cooling and condensation, a conical sleeve 13 is arranged in the second tube body, and the larger end of the conical sleeve 13 points to the direction of the sludge, so as to increase the pressure required for the movement of the sludge after cooling and condensation. The specific conveying pipe 1 includes a first tube body and a second tube body connected by a sleeve 12. The first tube body and the second tube body are threadedly assembled at both ends of the sleeve 12. The pressure relief mechanism and the cooling mechanism are respectively arranged at both ends of the first tube body. The conical sleeve 13 is located in the inner cavity of one end of the second tube body close to the sleeve 12, and can be fixed to the second tube body by welding or bolting. In order not to affect the normal transmission of the spiral conveying shaft 11, the spiral conveying shaft 11 is provided with a spiral blade with a reduced outer diameter at the portion of the conical sleeve 13, or the corresponding portion of the conical sleeve 13 is not provided with a spiral blade. The taper of the conical sleeve 13 is 3-10 degrees.

[0035] In an optional embodiment, the spiral conveying shaft 11 includes two sections adapted to the conveying pipe 1, and the lengths of the two sections of the spiral conveying shaft 11 are adapted to the lengths of the first tube body and the second tube body, respectively, so that the spiral conveying shaft 11 can be assembled smoothly, and the two sections of the spiral conveying shaft 11 are connected in a detachable manner by a pin, a coupling, etc.

[0036] Generally speaking, when the screw conveying shaft 11 is started after the cooling mechanism is closed, the screw conveying shaft 11 can drive the solidified sludge to continue to move forward through the axial transmission force of its own rotation. However, in order to reduce the resistance that needs to be overcome in this process, a heating element is provided on the outer wall of the conveying pipe 1 corresponding to the position of the conical sleeve 13. The heating element can be an electric heating sleeve or an electric heating plate. The electric heating is used to quickly dissolve the sludge and pass through the conical sleeve 13.

[0037] In an optional embodiment, a drive motor 3 is provided at one end of the conveying pipe 1 corresponding to the discharge port. The drive motor 3 is used to provide power to the screw conveying shaft 11. The drive motor 3 is a speed-regulating motor, and its main shaft is correspondingly connected to the screw conveying shaft 11.

[0038] A square shell is provided at one end of the conveying pipe 1 away from the feed port, a discharge port is provided on the side of the square shell, and a gate valve 2 is provided at the discharge port, so that the discharge port of the conveying pipe 1 can be controlled. The gate valve 2 is a conventional valve body and is not subject to too many restrictions.

[0039] The cooling mechanism, screw conveyor and pressure relief mechanism are connected to the controller 7 respectively. The controller 7 can be a single chip microcomputer or a plc. The intelligent control is performed by electrically connecting the heating element, the three-way solenoid valve 8, the drive motor 3 and the pressure sensor to improve the intelligence of the equipment.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A screw conveyor anti-surge device, characterized in that: include: A screw conveyor, wherein the screw conveyor has a conveying pipe and a screw conveying shaft; A pressure relief mechanism, which is arranged on the pipe wall of the conveying pipe near the feed inlet and is correspondingly connected to a conveying pump to discharge the water flowing into the conveying pipe out of the screw conveyor; A cooling mechanism, which is arranged in the middle of the conveying pipe and is used to cool and condense the sludge inside the conveying pipe; The conveying pipe includes a first tube body and a second tube body connected by a sleeve, the pressure relief mechanism and the cooling mechanism are respectively arranged at both ends of the first tube body, a tapered sleeve is provided in the inner cavity of one end of the second tube body close to the sleeve, and a spiral blade with a reduced outer diameter is provided on the spiral conveying shaft at the tapered sleeve part.

2. The anti-surge device for a screw conveyor according to claim 1, characterized in that: The pressure relief mechanism comprises: A plurality of pressure relief holes are evenly distributed along the axial direction of the delivery pipe; A liquid collecting cover, the liquid collecting cover is correspondingly buckled on the outer wall of the delivery pipe to connect the plurality of pressure relief holes; The first end of the delivery pump is correspondingly connected to the liquid collecting cover through a connecting pipe, and the second end of the delivery pump extends to the liquid collecting tank through the connecting pipe.

3. The anti-surge device for a screw conveyor according to claim 2, characterized in that: The delivery pump is a bidirectional delivery pump, and the second end of the delivery pump is correspondingly connected to the bentonite solution production equipment through a three-way solenoid valve.

4. The anti-surge device for a screw conveyor according to claim 1, characterized in that: The spiral conveying shaft comprises two sections adapted to the conveying pipe, and the two sections of the spiral conveying shaft are connected in a detachable manner.

5. The anti-surge device for a screw conveyor according to claim 1, characterized in that: A driving motor is disposed at one end of the second tube body away from the first tube body, and the driving motor is correspondingly connected to the spiral conveying shaft.

6. The anti-surge device for a screw conveyor according to claim 1, characterized in that: A square shell is provided at one end of the second tube body away from the feed port, a discharge port is provided at the side of the square shell, and a gate valve is provided at the discharge port.

7. The anti-surge device for a screw conveyor according to claim 1, characterized in that: The cooling mechanism, the screw conveyor and the pressure relief mechanism are connected to the controller accordingly.

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