CN111577298A - Prevent gushing water and gush safe shield structure machine screw conveyer of sand - Google Patents

Abstract

The invention provides a safety unearthing shield machine screw conveyor capable of preventing water inrush and sand inrush. The spiral conveyor comprises a cylinder body, a spiral stirring shaft, a slag discharging gate and a slag discharging control device arranged at the gate opening, wherein the slag discharging control device comprises a connecting plate, a slag discharging sleeve, an impeller valve and an impeller valve driving device which are arranged in the slag discharging sleeve, a slag through hole is formed in the connecting plate, a slag inlet and a slag outlet are formed in the slag discharging sleeve, the slag inlet of the slag discharging sleeve is in sealed butt joint with the slag through hole in the connecting plate, and the slag inlet is arranged on the outer side of the gate opening of the slag discharging gate through the connecting plate; the impeller valve divides the inner cavity of the slag discharging sleeve into at least two slag discharging cavities and drives the slag discharging cavities to rotate through the impeller valve driving device. The invention has simple structure, convenient use and good sealing effect, can effectively control the soil output and solves the problem of gushing during the construction of the screw conveyor in the geological formation environment of a water-rich sand layer and a pressure-bearing water sand layer.

Description

Prevent gushing water and gush safe shield structure machine screw conveyer of sand

Technical Field

The invention belongs to the field of shield construction, and particularly relates to a water burst and sand burst preventing screw conveyor of a safe unearthing shield machine.

Background

In recent years, shield construction is the most safe construction method with further development and utilization of underground space. For the water-rich sand zone, a slurry shield is usually selected, but due to geological changes of the whole standard zone, construction site limitation and the like, an earth pressure balance shield sometimes has to be adopted. When the shield machine is normally propelled, the muck peeled off from the tunnel face enters the screw conveyor through the soil inlet of the screw conveyor and is discharged into the muck of the muck battery car through the belt conveyor.

The screw conveyer is used as a passage for transporting the slag soil in the excavation cabin of the earth pressure balance shield, and plays a main role in maintaining the balance of the excavation cabin, the stability of the tunnel face and the tunneling safety. The gate of the screw conveyor is a main component for ensuring the sealing of the screw conveyor, when the water amount in a soil layer is large, the gate is not well sealed or cannot be closed in time, a gushing accident can occur, the ground surface subsides slightly, the ground surface collapses seriously, and the safety risk is high. Present screw conveyer gate can generally be divided into single gate and two kinds of gate, and single gate simple structure, occupation space's big, run from opposite directions about the double gate, and occupation space is little, and relative speed is very fast, and the opening is opened to both sides by the centre, and its advantage is obvious, but blocks easily and dies, and the dregs that pass through from the gate opening part can deposit in gate department, and the dregs can block gate and door frame gap. So two kinds of screw conveyer gates of current are meetting when gushing water, gushing sand, and the silt that gushes is used for on the flashboard of gate, make the resistance increase that the flashboard was closed, just can't normally close, easily cause gushing the side of surpassing, even ground collapses. Another common method is to modify the primary screw conveyor into a secondary screw conveyor, but the cost is high, and if a water-rich stratum is encountered, the sealing effect is not good once water gushing and sand gushing occur.

In order to prevent the shield machine screw conveyor from having a gushing phenomenon, a plurality of patents are provided for improving the soil outlet of the screw conveyor, for example, the utility model patent of patent No. CN201620724889.2 is an opening and closing device for the soil outlet gate of the shield machine screw conveyor, the invention patent of patent No. CN201910321395.8 is a winch type automatic closing shield machine screw conveyor gate and a using method thereof, the prior art such as the screw conveyor gate obliquely arranged by the utility model patent No. CN2017217812975 is improved for the screw conveyor gate of the screw conveyor, the improvement needs to improve the originally applied structure of the screw conveyor, the existing screw conveyor equipment needs to be updated, the cost is higher, and the integral structure is more complex. For another example, patent No. CN20112052118521 discloses a safety device for a gate of a screw conveyor, which specifically includes that a connecting pipe is installed at the rear end of the gate of the screw conveyor, and a manual gate is installed on the connecting pipe, when a large amount of pressure water surges, the soil discharging gate of the screw conveyor is manually closed, and the manual gate is inconvenient to use and cannot control the soil discharging amount; patent number CN201911095616.0 discloses a shield constructs screw conveyer with prevent device of gushing specifically includes screw conveyer and band conveyer, still includes the device of gushing of preventing and control circuit, the device of gushing of preventing has a tubulose main part, opens and shuts the gate and pneumatic control system, and the device of gushing of preventing of this patent structure is complicated, and is bulky, and occupation space is great, and is not too suitable for the narrow region in space, also can't control out soil volume moreover. In the shield construction process, the soil discharge flow of the screw conveyor is usually required to be set according to different requirements of a tunneling stratum, and the problems of ground settlement, gushing and the like are easily caused by improper soil discharge flow control of the screw conveyor, so that the shield construction safety is seriously threatened.

Disclosure of Invention

The invention provides a safe unearthed shield machine screw conveyor for preventing water inrush and sand inrush, which is characterized in that an unearthed control device is additionally arranged at a gate opening to control the speed of slag discharge and release the pressure in the screw conveyor, so that the problem of spewing of the traditional screw conveyor in the shield construction process of a water-rich sand layer and a pressure-bearing water sand layer is solved.

In order to achieve the purpose, the invention provides a safe soil discharging shield machine screw conveyor capable of preventing water gushing and sand gushing, which comprises a screw conveyor cylinder, a driving device, a screw stirring shaft arranged in the screw conveyor cylinder and a slag discharging gate arranged on the screw conveyor cylinder, and is characterized in that: the slag tapping control device comprises a connecting plate, a slag tapping sleeve, an impeller valve and an impeller valve driving device, wherein the impeller valve and the impeller valve driving device are arranged in the slag tapping sleeve; the impeller valve comprises a central rotating shaft, at least two rotating baffles distributed along the circumferential direction of the central rotating shaft and impellers arranged at two ends of the at least two rotating baffles, the impeller valve is horizontally arranged in the slag discharging sleeve and divides the inner cavity of the slag discharging sleeve into at least two slag discharging cavities, and the outer edge of each impeller and the edge of each rotating baffle are in sealing contact with the inner wall of the slag discharging sleeve; the impeller valve driving device is arranged on a driving device mounting seat on one side of the slag discharging sleeve, an output shaft of the impeller valve driving device is connected with a central rotating shaft of the impeller valve, and the impeller valve is driven to rotate in the slag discharging sleeve to control the slag discharging amount.

The further technical scheme of the invention is as follows: impeller valve drive arrangement is hydraulic motor to supporting hydraulic control system that is equipped with, hydraulic control system adopts open hydraulic control system, including oil tank, hydraulic pressure plunger pump and electromagnetic directional valve, the hydraulic pressure plunger pump is axial variable plunger pump, by a four-pole motor drive to control through the proportional valve, the electromagnetic directional valve is the two way control valve, and the input of hydraulic pressure plunger pump links to each other with the oil tank, and the output passes through the electromagnetic directional valve and links to each other with hydraulic motor's hydro-cylinder input, and hydraulic motor's hydro-cylinder oil pipe returns the oil tank through the electromagnetic directional valve.

The invention has the following excellent technical scheme: the length of the impeller valve is equal to that of an inner cavity of the slag discharging sleeve, the outer diameter of the impeller is equal to that of the inner diameter of the slag discharging sleeve, and a first sealing ring is arranged on the contact surface of the outer edges of the two impellers and the inner wall of the slag discharging sleeve; rotating barrier is square baffle, and its thickness is 5 ~ 8cm, and one of them long limit is fixed in central pivot, and another long limit contacts with the telescopic inner wall of slagging tap to be equipped with the sealing strip at the contact surface, the sealing strip embedding is seted up in the sealing strip draw-in groove on rotating barrier.

The invention has the following excellent technical scheme: the connecting plate is a square plate body with the shape and the size same as those of a gate opening of the slag discharging gate, a plurality of threaded connecting holes are formed in the plate body, the area of each slag through hole is 1/3-2/5 of the area of the gate opening, the size of each slag through hole is the same as that of a slag inlet of the sleeve, and a second sealing ring is arranged on the butt joint surface of each slag through hole of the connecting plate and the slag discharging gate; and a slag material outlet with the area larger than that of the gate opening of 1/2 is also formed in the plate body, and the slag material outlet and the sleeve slag hole are aligned to the slag belt conveyor.

The invention has the following excellent technical scheme: impeller valve includes four rotating baffle, and four rotating baffle distribute along the circumferencial direction of central pivot equidistant to combine to separate into four the same, just cross-section fan-shaped chamber of slagging tap of the telescopic inner chamber of slagging tap with the impeller at both ends, the bore that the sleeve advances slag notch and sleeve slag notch all is less than the cross-section arc length in every chamber of slagging tap.

The invention has the following excellent technical scheme: bearing holes are respectively formed in the driving device mounting seat and the sealing end covers, rolling bearings are correspondingly mounted on the driving device mounting seat and the sealing end covers, the two ends of the central rotating shaft respectively extend out of the slag discharging sleeve to be rotatably connected with the rolling bearings on the corresponding sides, the connecting parts are sealed through the bearing covers, and the shaft end penetrating through the driving device mounting seat is connected with an output shaft of the impeller valve driving device.

The further technical scheme of the invention is as follows: the impeller of impeller valve both ends and the sleeve both ends enclosed construction of slagging tap are equipped with lubricated chamber between, are equipped with first lubricated oil circuit in central pivot, are equipped with the second lubricated oil circuit of intercommunication lubricated chamber and first lubricated oil circuit in the position that every rotating barrier closes on the impeller, and first lubricated oil circuit runs through central pivot to be equipped with the shutoff head respectively at both ends.

The invention has the following excellent technical scheme: and the first sealing ring and the sealing strip are both polyurethane sealing strips.

The invention has the following excellent technical scheme: and a circle of sealing ring clamping groove is arranged at the outer edge of a slag through hole at the connecting surface of the connecting plate and the slag discharging gate, and the second sealing ring is a polyurethane sealing strip and is embedded into the groove.

The invention has the following excellent technical scheme: the first lubricating oil path is arranged on the central axis of the central rotating shaft, the diameter of the first lubricating oil path is 1-1.3 cm, and the diameter of the second lubricating oil path is 0.6-0.9 cm; the oil tank adopts an oil tank with a hydraulic system of the shield machine.

The invention has the beneficial effects that:

(1) according to the invention, the problem of gushing of the traditional screw conveyor in the shield construction process of a water-rich sand layer and a pressure-bearing water sand layer is solved by adding the soil discharging control device at the gate opening of the screw conveyor and controlling the soil discharging amount;

(2) the unearthing control device can be directly installed at a gate opening of the spiral conveyor through bolts, the gate opening structure of the spiral conveyor is not affected, the existing spiral conveyor is not required to be improved, the unearthing control device can be directly installed and disassembled according to needs, the use is convenient and simple, the unearthing control device can be independently taken down for maintenance, cleaning or replacement even if a fault occurs, the replacement of a whole machine is not needed, and the production cost is reduced;

(3) the unearthing control device adopts the structure of the impeller valve, is controlled by a hydraulic control system, controls the rotation speed of the impeller valve and the slag discharging speed by controlling an electric signal, can release the pressure in the screw conveyor by the rotation of the blades no matter the rotation speed of the impeller valve, greatly solves the problem of gushing, and avoids the problem of ground collapse;

(4) the soil discharging device comprises an impeller valve and an outer sleeve, wherein the impeller valve is tightly matched with the outer sleeve, so that the normal rotation of the impeller valve can be ensured, and the sealing effect between the impeller valve and the wall of the sleeve can also be ensured;

the invention has simple structure, convenient use, good sealing effect, effective control of soil output, high construction continuous efficiency, low cost, high economy, convenient assembly and disassembly of the device, and strong popularization, solves the problem of gushing during the construction of the screw conveyor in the geological layer environment of the water-rich sand layer and the pressure-bearing water sand layer, and improves the construction safety.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the slag tapping control device according to the present invention;

FIG. 3 is a bottom view of the slag tapping control device of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 2;

FIG. 5 is a cross-sectional view B-B of FIG. 2;

FIG. 6 is a hydraulic control diagram of the impeller valve drive of the present invention;

FIG. 7 is a schematic view of the construction of the connection plate of the present invention;

FIG. 8 is a schematic view of the tapping sleeve according to the present invention;

FIG. 9 is a longitudinal cross-sectional view of the tapping sleeve according to the present invention;

FIG. 10 is a schematic view of the impeller valve of the present invention;

FIG. 11 is a longitudinal cross-sectional view of the impeller valve of the present invention;

FIG. 12 is a cross-sectional view E-E of FIG. 11;

FIG. 13 is a schematic view of the structure of the driving device mounting base of the present invention;

FIG. 14 is a schematic structural view of a seal end cap according to the present invention;

FIG. 15 is a cross-sectional view of the drive mount;

fig. 16 is a cross-sectional view of a sealed end cap.

In the figure: 1-screw conveyer cylinder, 2-driving device, 3-screw stirring shaft, 4-slag tap gate, 5-slag tap control device, 50-connecting plate, 5000-slag through hole, 5001-screw thread connecting hole, 5002-slag tap hole, 5003-seal ring clamping groove, 51-slag tap sleeve, 52-vane wheel valve, 5200-central rotating shaft, 5201-rotating baffle, 5202-vane wheel, 5203-lubricating cavity, 5204-first lubricating oil circuit, 5205-two lubricating oil circuits, 5206-sealing head, 53-vane wheel valve driving device, 54-sealing end cover, 55-driving device mounting seat, 56-sleeve slag inlet, 57-sleeve slag tap hole, 58-sealing strip, 5800-sealing strip clamping groove, 59-first sealing ring, 510-second sealing ring, 511-oil tank, 512-hydraulic plunger pump, 513-electromagnetic directional valve, 514-hydraulic plunger pump, 515-quadrupole motor, 516-proportional valve, 517-rolling bearing, 518 bearing cap.

Detailed Description

The invention is further illustrated by the following figures and examples. Fig. 1 to 16 are drawings of embodiments, which are drawn in a simplified manner only for the purpose of clearly and concisely illustrating embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The embodiment provides a shield constructs quick-witted screw conveyer that unearths of safety of gushing water and gushing sand, as shown in fig. 1, including screw conveyer barrel 1, drive arrangement 2, arrange screw stirring shaft 3 in screw conveyer barrel 1 in and arrange the gate 4 of slagging tap on screw conveyer barrel 1 in, be equipped with the stirring leaf on screw stirring shaft 3, carry the muck to the muck export from the muck import of screw conveyer barrel 1 through drive arrangement 2 drive, and be equipped with the gate 4 of slagging tap in the muck export, control through the gate 4 of slagging tap and slag tap, send the muck to the band conveyer on, and export it through the band conveyer. The screw conveyor of the invention also comprises a slag control device 5 arranged outside the slag gate 4. As shown in fig. 2 to 4, the slag tapping control device 5 includes a connecting plate 50, a slag tapping sleeve 51, an impeller valve 52 and an impeller valve driving device 53, the impeller valve 52 and the impeller valve driving device 53 are disposed in the slag tapping sleeve 51, a slag through hole 5000 is disposed on the connecting plate 50, a sleeve slag inlet 56 and a sleeve slag outlet 57 are symmetrically disposed on a cylinder of the slag tapping sleeve 51, the slag tapping sleeve 51 is mounted on the connecting plate 50, the slag inlet is in sealed butt joint with the slag through hole 5000 on the connecting plate 50, as shown in fig. 1, the slag tapping control device 5 is mounted on the outer side of the slag tapping gate 4 through the connecting plate 50, and the slag through hole 5000 is in sealed butt joint with the slag outlet of the slag tapping gate 4. As shown in fig. 5, the impeller valve 52 is horizontally arranged in the slag discharging sleeve 51, and divides the inner cavity of the slag discharging sleeve 51 into four slag discharging cavities 5100, and the outer edge of the impeller valve 52 is in sealing contact with the inner wall of the slag discharging sleeve 51; the impeller valve driving device 53 is installed at one side of the slag discharging sleeve 51, and an output shaft thereof is connected with the central rotating shaft 5200 of the impeller valve 52 to drive the impeller valve 52 to rotate in the slag discharging sleeve 51 to control the slag discharging amount.

The embodiment provides a shield constructs quick-witted screw conveyer safely unearthed of water burst sand gushing prevention, impeller valve drive arrangement 53 is hydraulic motor to the supporting hydraulic control system that is equipped with, as shown in fig. 6, hydraulic control system adopts open hydraulic control system, through external signal of telecommunication, including oil tank 511, hydraulic pressure plunger pump 512 and solenoid directional valve 513, hydraulic pressure plunger pump 514 is axial variable plunger pump, is driven by a 55KW quadrupole motor 515, and driving speed 1470r/min, and quadrupole motor 515 passes through auxiliary parts such as type cover, shaft coupling and is connected with the control end of hydraulic pressure plunger pump 514, and hydraulic pressure plunger pump 514 controls through proportional valve 516, and the operating voltage 24V of proportional valve 516, control circuit 200mA-600 mA. The electromagnetic directional valve 513 is a two-way control valve for performing two-way rotation switching, the input end of the hydraulic plunger pump 512 is connected with the oil tank 511, the output end of the hydraulic plunger pump is connected with the input end of the oil cylinder of the hydraulic motor through the electromagnetic directional valve 513, and the oil outlet pipe of the oil cylinder of the hydraulic motor returns to the oil tank 511 through the electromagnetic directional valve 513. The oil tank 5011 adopts an oil tank with a hydraulic system of the shield tunneling machine. An open type hydraulic plunger pump in the hydraulic control system is driven by a quadrupole motor 515, an S port of the hydraulic plunger pump 512 sucks oil from a shield machine oil tank 5011, the oil is discharged from an A port and enters an oil inlet A port of an impeller valve driving device 53 (a hydraulic motor) to drive the hydraulic motor to rotate, and low-pressure oil of the hydraulic motor returns to the shield machine oil tank 5011 through a B port. The electric control hydraulic system drives the hydraulic motor to drive the impeller valve 52 to rotate, and the flow of the hydraulic valve bank is controlled by adjusting the current according to the requirement so as to control the rotating speed of the impeller valve 52. The faster the impeller valve 52 rotates, the more efficient the tapping system, which can be controlled as required.

The embodiment provides a slag control device 5, its connecting plate 50 concrete structure is shown in fig. 7, adopts the square plate body that the shape size is the same with the shape of the gate 4 of slagging tap, has seted up a plurality of threaded connection holes 5001 on the plate body, can make things convenient for bolted connection to screw conveyer's the gate 4 department of slagging tap, the area of slag charge through-hole 5000 is about 1/3 of gate area, and advances the shape size of slag hole 56 the same with the sleeve, is equipped with round sealing washer draw-in groove 5003 at the outer fringe of slag charge through-hole 5000 of face to imbed the second sealing washer 510 that the polyurethane sealing strip was made in sealing washer draw-in groove 5003, when connecting plate 50 is connected with screw conveyer's the gate 4 of slagging tap, can seal through second sealing washer 510. Still set up the slag charge discharge port 5002 that the area is greater than 1/2 gate mouth area on the connecting plate, when the tunnelling is smooth and easy, can directly open the gate mouth completely without dismantling slag output controlling means 5, can directly pass through the ejection of compact of slag charge discharge port 5002 directly discharges the dregs to dregs belt conveyor on, can practice thrift slag output controlling means 5's dismouting time.

The slag tapping sleeve 51 of the slag tapping control device 5 provided by the embodiment is of a circular cylindrical structure as shown in fig. 8 and 9, flange connection discs are respectively arranged at two ends of the slag tapping sleeve 51, as shown in fig. 13 and 14, bolt connection holes are also arranged on the driving device mounting seat 55 and the sealing end cover 54, the driving device mounting seat 55 can be in sealing connection with the flange connection disc at one end of the slag tapping sleeve 51, and the sealing end cover 54 can be in sealing connection with the flange connection disc at the other end of the slag tapping sleeve 51. As shown in fig. 15 and 16, bearing holes are respectively opened on the driving device mounting seat 55 and the sealing end cover 59, as shown in fig. 4, a rolling bearing 517 is correspondingly installed in the bearing hole on each side, two ends of the central rotating shaft 5200 of the impeller valve 52 respectively extend out of the slag discharging sleeve 51 to be rotatably connected with the rolling bearing 517 on the corresponding side, and are sealed by the bearing cover 518 at the joint, and the joints are sealed by the bearing seals, so that the sealing effect is ensured. One end of a central rotating shaft 5200 of the impeller valve 52 is a driving end, the central rotating shaft is installed with a hydraulic motor through a key groove and a spline of the shaft, an end cover of the hydraulic motor is installed, the other end of the central rotating shaft is a driven end, and the central rotating shaft is connected with the sealing end cover 54 in a sealing mode through a bearing cover 518 and a bearing sealing piece. In the embodiment, the inner ring of the slag discharging sleeve 51 is manufactured according to the external dimension of the impeller valve 52, the impeller valve 52 is arranged inside the slag discharging sleeve 51 to achieve clearance fit, and the impeller valve 52 is connected with the slag discharging sleeve 51 in a sealing mode to achieve sealing effect. The top of the slag discharging sleeve 51 is connected with the earth outlet of the screw machine, the opening and closing of the screw slag discharging gate 4 are not affected, and a polyurethane sealing strip is additionally arranged at the position of the connecting plate of the screw machine, so that slurry is prevented from leaking outside.

The impeller valve 52 of the slag tapping control device 5 provided by the embodiment comprises a central rotating shaft 5200, four rotating baffles 5201 distributed along the circumferential direction of the central rotating shaft 520 and impellers 5202 arranged at two ends of the four rotating baffles 5201, as shown in fig. 10 to 12, wherein the impeller valve 52 is made of a Q345 steel material, the length of the impeller valve is equal to the length of an inner cavity of a slag tapping sleeve 51, the outer diameter of the impeller 5202 is equal to the inner diameter of the slag tapping sleeve 51, and a first sealing ring 59 is arranged on the contact surface of the outer edges of the two impellers 5202 and the inner wall of the slag tapping sleeve 51. Four rotating baffles 5201 are distributed at equal intervals along the circumferential direction of a central rotating shaft 5200, an included angle of 90 degrees is formed between two adjacent rotating baffles 5201, the four rotating baffles 5201 are combined with impellers 5202 at two ends to divide the inner cavity of the slag discharging sleeve 51 into four slag discharging cavities 5100 which have the same size and fan-shaped cross sections, the calibers of the sleeve slag inlet 56 and the sleeve slag outlet 57 are both smaller than the cross-section arc length of each slag discharging cavity 5100, and therefore, the slag soil can be ensured to enter each slag discharging cavity 5100. The rotary baffle 5201 is a square baffle, and is integrated with the central rotating shaft 5200, and the thickness is about 6cm, and the length is 82cm, and one long side is fixed on the central rotating shaft 5200, and the other long side is contacted with the inner wall of the slag discharging sleeve 51, and a sealing strip 58 is arranged on the contact surface, and the sealing strip 58 is embedded into a sealing strip clamping groove 5800 arranged on the rotary baffle 5201. The first sealing ring 59 and the sealing strip 58 are both made of polyurethane sealing strips.

In order to make the impeller valve 52 rotate smoothly in the slag discharging sleeve 51, in the embodiment, the outer sides of the impellers 5202 at both ends of the impeller valve 52 are provided with grooves, as shown in fig. 4 and fig. 12, after the impeller valve 52 is installed in the slag discharging sleeve 51, the grooves at both end surfaces respectively form a lubricating cavity 5203 with a closed structure at both ends of the slag discharging sleeve 51, a first lubricating oil passage 5204 with a diameter of 1.2cm is arranged on the central axis of the central rotating shaft 5200, a second lubricating oil passage 5205 for communicating the lubricating cavity 5203 with the first lubricating oil passage 5204 is arranged at the position of each rotary baffle 5201 close to the impeller 5202, the first lubricating oil passage 5204 penetrates through the central rotating shaft 5200, and a blocking plug 6 is respectively arranged at both ends, and the blocking plugs 5206 are connected by screw threads, so that lubricating oil can be conveniently injected into the lubricating. The diameter of the second lubricating oil path 5205 is 0.8cm, and the included angle between the second lubricating oil path on each rotary baffle 5201 and the central rotating shaft 5200 is 60 °. The impeller valve in the embodiment has a total length of about 1.5 m, the cavity and the impeller sealing part have a length of about 1 m, and the left and right sides extend out of the shaft by about 50 cm.

When the invention is used, the slag control device 5 can be arranged on the slag hole of the screw conveyer according to the requirement, the mounting is convenient to dismount through bolts, the normal opening and closing of the slag gate 4 can not be influenced after the mounting, after the slag control device 5 is mounted, the opening degree of the slag gate 4 is adjusted, the slag hole is smaller than or equal to the slag through hole 5000 on the connecting plate of the slag control device 5, the material can be normally discharged, the slag is conveyed to the discharging gate 4 through the screw stirring shaft 3 and then directly enters each slag cavity 5100 of the slag control device 5 for discharging the slag, the rotating speed of the impeller valve 52 of the slag control device 5 can be controlled according to the discharging speed of the slag of the screw conveyer, thereby the discharging speed is controlled, the pressure in the screw conveyer can be released through the rotation of the blades no matter the rotating speed of the impeller valve, the problem of gushing is solved greatly, and the problem of ground collapse is avoided. The screw conveyor is mainly used for soil layers with high water content, such as water-rich sand layers, pressure-bearing water sand layers and the like, and achieves the purpose of preventing gushing, when the tunneling is smooth and does not need to prevent gushing, the slag control device 5 does not need to be disassembled, the gate opening is directly and completely opened, the slag is directly discharged through the slag discharge port 5002 on the connecting plate 50, the slag is directly discharged onto the slag belt conveyor, and the disassembling and assembling time of the slag control device 5 can be saved.

The invention can control the rotation speed of the impeller valve and the slag discharge speed by controlling the electric signal, release the pressure in the screw machine by the rotation of the impeller blade, greatly solve the problem of gushing, avoid the problem of ground collapse, and has the advantages of reliable safety, high construction continuous efficiency, low cost, high economy, convenient assembly and disassembly of the device and strong popularization.

In summary, the present invention is described as an embodiment, but the present invention is not limited to the above embodiment, and any similar or identical means may be used to achieve the technical effects of the present invention, and all such means should fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a prevent gushing water and gush safe shield structure machine screw conveyer that unearths of sand, includes screw conveyer barrel (1), drive arrangement (2), arranges spiral (mixing) shaft (3) in screw conveyer barrel (1) in and arranges slag tap gate (4) on screw conveyer barrel (1) in, its characterized in that: a slag tapping control device (5) is arranged at a gate port of the slag tapping gate (4), the slag tapping control device (5) comprises a connecting plate (50), a slag tapping sleeve (51), an impeller valve (52) and an impeller valve driving device (53) which are arranged in the slag tapping sleeve (51), a slag through hole (5000) is arranged on the connecting plate (50), the slag discharging sleeve (51) is of a circular cylinder structure, wherein one end is provided with a driving device mounting seat (55), the other end is provided with a sealing end cover (54), a sleeve slag inlet (56) and a sleeve slag outlet (57) are respectively arranged on the cylinder body of the slag discharging sleeve (51), the slag discharging sleeve (51) is arranged on the connecting plate (50), the slag inlet is in sealed butt joint with a slag through hole (5000) on the connecting plate (50), and is arranged outside the gate opening of the slag discharging gate (4) through a connecting plate (50), the slag through hole (5000) is in sealed butt joint with a slag outlet of the slag discharging gate (4); the impeller valve (52) comprises a central rotating shaft (5200), at least two rotating baffles (5201) distributed along the circumferential direction of the central rotating shaft (5200) and impellers (5202) arranged at two ends of the at least two rotating baffles (5201), the impeller valve (52) is horizontally arranged in the slag discharging sleeve (51) and divides the inner cavity of the slag discharging sleeve (51) into at least two slag discharging cavities (5100), and the outer edge of the impeller (5202) and the edge of each rotating baffle (5201) are in sealing contact with the inner wall of the slag discharging sleeve (51); the impeller valve driving device (53) is arranged on a driving device mounting seat (55) on one side of the slag discharging sleeve (51), an output shaft of the impeller valve driving device is connected with a central rotating shaft (5200) of the impeller valve (52), and the impeller valve (52) is driven to rotate in the slag discharging sleeve (51) to control the slag discharging amount.

2. The screw conveyor of the shield tunneling machine for preventing water inrush and sand inrush of the claim 1 is characterized in that: impeller valve drive arrangement (53) are hydraulic motor to supporting hydraulic control system that is equipped with, hydraulic control system adopts open hydraulic control system, including oil tank (511), hydraulic pressure plunger pump (512) and solenoid directional valve (513), hydraulic pressure plunger pump (514) are the axial variable plunger pump, by a four pole motor (515) drive to control through proportional valve (516), solenoid directional valve (513) are the two-way control valve, and the input of hydraulic pressure plunger pump (512) links to each other with oil tank (511), and the output passes through solenoid directional valve (513) and links to each other with hydraulic motor's hydro-cylinder input, and hydraulic motor's hydro-cylinder goes out oil pipe and returns oil tank (511) through solenoid directional valve (513).

3. The screw conveyor of the safe earth-moving shield machine for preventing water and sand gushing according to the claim 1 or 2, characterized in that: the length of the impeller valve (52) is equal to the length of an inner cavity of the slag discharging sleeve (51), the outer diameter of the impeller (5202) is equal to the inner diameter of the slag discharging sleeve (51), and a first sealing ring (59) is arranged on the contact surface of the outer edges of the two impellers (5202) and the inner wall of the slag discharging sleeve (51); rotating baffle (5201) is square baffle, and its thickness is 5 ~ 8cm, and one of them long limit is fixed on central pivot (5200), and the contact of the inner wall of another long limit and slag discharge sleeve (51) to be equipped with sealing strip (58) at the contact surface, in sealing strip draw-in groove (5800) of establishing on rotating baffle (5201) are embedded in sealing strip (58).

4. The screw conveyor of the safe earth-moving shield machine for preventing water and sand gushing according to the claim 1 or 2, characterized in that: the connecting plate (50) is a square plate body with the shape and size identical to that of a gate opening of the slag discharging gate (4), a plurality of threaded connecting holes (5001) are formed in the plate body, the area of the slag through hole (5000) is 1/3-2/5 of the area of the gate opening, the slag through hole is identical to that of the sleeve slag inlet (56), and a second sealing ring (510) is arranged on the butt joint face of the slag through hole (5000) of the connecting plate (50) and the slag discharging gate (4); the plate body is also provided with a slag discharge port (5002) with the area larger than that of the gate opening 1/2, and the slag discharge port (5002) and the sleeve slag outlet (57) are aligned to the slag belt conveyor.

5. The screw conveyor of the safe earth-moving shield machine for preventing water and sand gushing according to the claim 1 or 2, characterized in that: the impeller valve (52) comprises four rotary baffles (5201), the four rotary baffles (5201) are distributed at equal intervals along the circumferential direction of a central rotating shaft (5200), and are combined with impellers (5202) at two ends to divide an inner cavity of the slag discharging sleeve (51) into four slag discharging cavities (5100) which have the same size and fan-shaped cross sections, and the calibers of the slag inlet (56) and the slag outlet (57) of the sleeve are smaller than the arc length of the cross section of each slag discharging cavity (5100).

6. The screw conveyor of the safe earth-moving shield machine for preventing water and sand gushing according to the claim 1 or 2, characterized in that: bearing holes are respectively formed in the driving device mounting seat (55) and the sealing end cover (59), rolling bearings (517) are correspondingly mounted, two ends of the central rotating shaft (5200) respectively extend out of the slag discharging sleeve (51) to be rotatably connected with the rolling bearings (517) on the corresponding sides, the joint is sealed through the bearing cover (518), and the shaft end penetrating through the driving device mounting seat (55) is connected with an output shaft of the impeller valve driving device (53).

7. The screw conveyor of the shield tunneling machine for preventing water inrush and sand inrush of the claim 2 is characterized in that: a lubricating cavity (5203) is arranged between the impeller (5202) at the two ends of the impeller valve (52) and the sealing structure at the two ends of the slag discharging sleeve (51), a first lubricating oil way (5204) is arranged in the central rotating shaft (5200), a second lubricating oil way (5205) communicated with the lubricating cavity (5203) and the first lubricating oil way (5204) is arranged at the position of each rotary baffle plate (5201) close to the impeller (5202), the first lubricating oil way (5204) penetrates through the central rotating shaft (5200), and blocking heads (5206) are respectively arranged at the two ends.

8. The safety earth-moving shield machine screw conveyor capable of preventing water and sand gushing according to claim 3, is characterized in that: the first sealing ring (59) and the sealing strip (58) are both made of polyurethane sealing strips.

9. The safety shield tunneling machine screw conveyor capable of preventing water and sand gushing is characterized in that: the outer edge of a slag through hole (5000) at the connecting surface of the connecting plate (50) and the slag discharging gate (4) is provided with a circle of sealing ring clamping groove (5003), and the second sealing ring (510) is embedded into the groove by adopting a polyurethane sealing strip.

10. The screw conveyor of the shield tunneling machine for preventing water inrush and sand inrush of claim 7, characterized in that: the first lubricating oil way (5204) is arranged on the central axis of the central rotating shaft (5200), the diameter of the first lubricating oil way is 1-1.3 cm, and the diameter of the second lubricating oil way (5205) is 0.6-0.9 cm; the oil tank (5011) adopts an oil tank with a hydraulic system of the shield tunneling machine.

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