阅读说明：本技术 一种土压平衡盾构机的螺旋输送机的出渣闸门系统 (Residue discharge gate system of screw conveyer of earth pressure balance shield machine ) 是由 陈顺天 黄春来 陈明才 饶伟 王建中 陈细红 于 2021-09-26 设计创作，主要内容包括：本发明公开了一种土压平衡盾构机的螺旋输送机的出渣闸门系统,包括依次安装在螺旋输送机出渣口的第一道闸门、第二道闸门、出渣导管、第三道闸门和溜渣漏斗。每道闸门包括闸板支撑架、闸板、一对油缸支座和两个液压油缸；闸板支撑架包括支撑架本体、尼龙导向槽和密封组件；闸板包括闸板本体和闸板顶部；一对油缸支座固定在支撑架本体的两边外侧面的中部；两个液压油缸各自安装在一对油缸支座上,两个液压油缸的活塞杆各自通过连接机构连接在闸板顶部的两边；出渣导管的进、出口端之间的夹角为120°～160°；溜渣漏斗的进、出口端之间的夹角为100°～130°。本发明能有效降低渣土的流动速度,避免盾构机在掘进过程中发生喷涌现象。(The invention discloses a slag discharging gate system of a screw conveyer of an earth pressure balance shield machine, which comprises a first gate, a second gate, a slag discharging guide pipe, a third gate and a slag chute hopper which are sequentially arranged at a slag discharging hole of the screw conveyer. Each gate comprises a gate plate supporting frame, a gate plate, a pair of oil cylinder supports and two hydraulic oil cylinders; the flashboard support frame comprises a support frame body, a nylon guide groove and a sealing assembly; the gate plate comprises a gate plate body and a gate plate top; the pair of oil cylinder supports are fixed in the middle of the outer side surfaces of the two sides of the support frame body; the two hydraulic oil cylinders are respectively arranged on the pair of oil cylinder supports, and piston rods of the two hydraulic oil cylinders are respectively connected to two sides of the top of the flashboard through a connecting mechanism; the included angle between the inlet end and the outlet end of the slag discharging conduit is 120-160 degrees; the included angle between the inlet end and the outlet end of the slag sliding funnel is 100-130 degrees. The invention can effectively reduce the flowing speed of the muck and avoid the phenomenon of gushing of the shield tunneling machine in the tunneling process.)

1. A slag discharging gate system of a screw conveyer of an earth pressure balance shield machine comprises a first gate and a second gate which are sequentially arranged at a slag discharging hole of the screw conveyer; the slag discharging gate system is characterized by further comprising a slag discharging guide pipe, a third gate and a slag sliding hopper which are sequentially connected to the outlet end of the second gate;

the first gate, the second gate and the third gate are all the same in structure and size, the opening direction of the first gate is opposite to that of the second gate, and the opening direction of the third gate is the same as that of the second gate;

the slag discharging conduit is arc-shaped, and the included angle between the inlet end and the outlet end is 120-160 degrees;

the first gate, the second gate and the third gate respectively comprise a gate plate support frame, a gate plate, a pair of oil cylinder supports and two hydraulic oil cylinders;

the flashboard support frame comprises a support frame body, a pair of side nylon guide grooves, a bottom nylon guide groove and a sealing assembly; the center of the surface of the support frame body is provided with a rectangular slag discharging gate, the top surface of the support frame body is provided with a gate plate stretching and closing opening communicated with the slag discharging gate, and two side grooves and a bottom groove are correspondingly formed along two side surfaces and the bottom surface of the slag discharging gate one by one; the center of the inlet end surface and the center of the outlet end surface of the support frame body are respectively provided with a flange plate in an integrated protruding mode; the pair of side nylon guide grooves are embedded in the two side grooves of the support frame body in a one-to-one correspondence manner; the bottom nylon guide groove is embedded in the bottom groove of the support frame body; the sealing assembly comprises a packing sealing ring arranged in a flashboard stretching and retracting port of the support frame body and a sealing pressing plate which is arranged on the top surface of the support frame body and presses on the packing sealing ring;

the gate comprises a gate body and a gate top; the width of the top of the gate plate is larger than that of the gate plate body, and two connecting holes are formed in two sides of the top of the gate plate respectively; the width of the flashboard body is matched with the distance between the pair of side nylon guide grooves, the flashboard body is movably arranged between the pair of side nylon guide grooves in the flashboard support frame, and the bottom of the flashboard body is inserted into the bottom nylon guide grooves when the slag discharging gate is completely closed;

the pair of oil cylinder supports are symmetrically fixed in the middle of the outer side surfaces of the two sides of the support frame body;

the two hydraulic oil cylinders are correspondingly arranged on the pair of oil cylinder supports one by one, and the free ends of the piston rods of the two hydraulic oil cylinders are respectively and correspondingly connected into the connecting holes on the two sides of the top of the flashboard through the connecting mechanisms;

the slag chute is L-shaped, the inlet end of the slag chute is connected to the flange plate at the outlet end of the third gate, and the included angle between the inlet end and the outlet end of the slag chute is 100-130 degrees.

2. The slag discharge gate system of the screw conveyer of the earth pressure balance shield machine according to claim 1, wherein a plurality of cleaning inflation holes communicated with the bottom groove are formed in the bottom surface of the support frame body, and a stainless steel ball valve is installed at the outer end of each cleaning inflation hole; the supporting frame is characterized in that first oil injection holes communicated with the side grooves are respectively formed in the outer side faces of two sides of the supporting frame body, two second oil injection holes communicated with the extending and retracting openings of the flashboards are respectively formed in the top surface of the inlet end and the top surface of the outlet end of the supporting frame body, and grease nipples are respectively installed at the outer ends of the first oil injection holes and the second oil injection holes.

3. The slag tapping gate system of the screw conveyer of the earth pressure balance shield machine according to claim 1 or 2, wherein the support frame body is formed by encircling an inlet end plate and an outlet end plate by a plurality of bolts, and the thickness of the inlet end plate is smaller than that of the outlet end plate.

4. The slag tapping gate system of the screw conveyor of the earth pressure balance shield machine according to claim 1, wherein a displacement sensor is installed between a surface of the top of the shutter plate and a top surface of the support frame body; a flashboard closing limit switch is installed on the surface of the top of the support frame body, and a limit baffle is correspondingly installed on the surface of the top of the flashboard; a support rod is arranged on the flashboard support frame, and a flashboard opening limit switch corresponding to the limit baffle is arranged on the support rod.

5. The slag discharging gate system of the screw conveyer of the earth pressure balance shield machine according to claim 1, wherein the oil cylinder support comprises a base and two supports, the back surface of the base is welded in the middle of the outer side surfaces of the two sides of the support frame body, and two threaded blind holes are respectively formed in the two sides of the front surface of the base; the middle part of the surface of the bracket is provided with a through hole, and the side surface of the bracket is provided with two bolt through holes which are in one-to-one correspondence with the two threaded blind holes on one side of the base; the two perforated brackets are symmetrically arranged on the outer surface of the middle part of the hydraulic oil cylinder and are respectively arranged on two sides of the base in a one-to-one correspondence mode through two bolts.

6. The slag tapping gate system of the screw conveyor of the earth pressure balance shield machine according to claim 1, wherein the connection mechanism comprises a joint bearing, a connector, a connecting pin and a stopper piece; the joint bearing is embedded in a connecting hole at the top of the flashboard; the connector is fixed on the free end of a piston rod of the hydraulic oil cylinder, is U-shaped, and is provided with a pin hole coaxially on each of two side walls; the lower part of the connecting pin is provided with a stop groove; the thickness of the stop piece is matched with the width of a stop groove on the connecting pin, and two bolt fixing holes are formed in the surface of the stop piece; a piston rod of the hydraulic oil cylinder is connected with a connecting hole on one side of the top of the flashboard through a connector, a pin hole on the connector is aligned to a joint bearing in the connecting hole, and the connecting pin is inserted into the pin hole on one side wall of the connector and sequentially passes through the joint bearing in the connecting hole and the pin hole on the other side wall of the connector, so that a stop groove is positioned outside the other side wall of the connector; the stop piece is embedded in the stop groove of the connecting pin and is fixed on the other side wall of the connecting head through two bolts.

7. The slag tapping gate system of the screw conveyer of the earth pressure balance shield machine according to claim 1, wherein the inlet end and the outlet end of the slag tapping duct are respectively provided with a flange plate, and the flange plate at the outlet end of the slag tapping duct is connected with the flange plate at the inlet end of the third gate.

8. The slag discharge gate system of the screw conveyer of the earth pressure balance shield tunneling machine according to claim 1, wherein the slag chute comprises a funnel body and an L-shaped slag chute integrally connected to an outlet end of the funnel body, and an included angle between an inlet end and an outlet end of the slag chute is 100-130 °.

Technical Field

The invention relates to a slag discharging gate system of a screw conveyer of an earth pressure balance shield machine.

Background

A hydraulic motor of the shield tunneling machine drives a cutter head to rotate, so that the slag soil cut from the excavated tunnel face enters the bottom of a soil bin from an opening of the cutter head, is conveyed to a slag discharge gate through a screw conveyor and then is discharged onto a belt conveyor, and the belt conveyor discharges the slag soil into a slag hopper car which is stopped on a track and is conveyed to a hole to be lifted to the ground through a slag outlet to be poured into a slag soil pit.

When the earth pressure balance shield machine is constructed, if the earth pressure balance shield machine meets bedrock bulges and full-section unconsolidated rock strata, soft and hard uneven rock transition section fracture water is relatively developed, the water content in an earth bin can be increased, an upper soil layer is very easy to be soaked in water and disturbed to collapse, so that earth overexcavation is caused, high-temperature gushing is caused in cutting of lower hard rock, beating abnormal sound, earth pressure fluctuation and rolling tool eccentric wear occur in the shield propulsion process. A catchment area appears when soft soil and hard rock are jointed, slag soil discharged by the screw conveyor cannot meet the requirement of belt sticky conveying, the carried slag soil causes that the face excavation cannot be controlled, the face instability, soil erosion and earth surface sedimentation easily occur in the tunneling process, the phenomenon that the slag discharging gate of the screw conveyor sprays water and leaks slurry and the like occurs when the shield machine stops tunneling, and extremely adverse influence is brought to the shield construction safety and the production progress. The method is used for analyzing the gushing problem of the screw conveyor, and finds that the main reason is that crack water is relatively developed in a rock-soil transition section, the proportion of uneven over-excavation water and soil is unbalanced when the tunnel face is soaked and collapsed, the cutter head of the upper soft and lower hard shield tunneling machine is subjected to high-temperature cutting to generate air flow, the soil pressure is increased and flows to the slag discharge gate of the screw conveyor to leak, and the circulation cycle is formed to influence the fluctuation change instability of the soil bin pressure. In order to prevent the gushing phenomenon, a shield machine manufacturer usually adopts a method that a soil bin gate is arranged at the front end of a spiral conveyor, and two slag discharge gates are arranged at the rear end of the spiral conveyor. The soil bin gate is divided by two flashboards from left to right, the opening is opened from the middle to two sides, the space occupied by the soil bin gate has the advantages of being small, the flowing of the muck is not smooth, the muck is easy to deposit at the gate, and the muck can be plugged into a gap to clamp the switch of the soil bin gate easily. Screw conveyer gate of slagging tap when meetting the gushing, the silt that gushes is used for on the flashboard of the gate of slagging tap, and the resistance increase that forms the flashboard of slagging tap can't normally be closed, causes easily that the gushing surpasss the side even ground collapses.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a slag tapping gate system of a screw conveyer of a soil pressure balance shield machine, which can effectively reduce the flow speed of muck, ensure that high-pressure muck in the screw conveyer can be timely decompressed, better control the pressure of a soil bin of the shield machine, avoid the occurrence of a gushing phenomenon of the shield machine in the tunneling process and ensure that the shield machine can keep continuous tunneling.

The purpose of the invention is realized as follows: a slag discharging gate system of a screw conveyer of an earth pressure balance shield machine comprises a first gate, a second gate, a slag discharging conduit, a third gate and a slag chute hopper which are sequentially arranged at a slag discharging hole of the screw conveyer; wherein the content of the first and second substances,

the first gate, the second gate and the third gate are all the same in structure and size, the opening direction of the first gate is opposite to that of the second gate, and the opening direction of the third gate is the same as that of the second gate;

the slag discharging conduit is arc-shaped, and the included angle between the inlet end and the outlet end is 120-160 degrees;

the first gate, the second gate and the third gate respectively comprise a gate plate support frame, a gate plate, a pair of oil cylinder supports and two hydraulic oil cylinders;

the flashboard support frame comprises a support frame body, a pair of side nylon guide grooves, a bottom nylon guide groove and a sealing assembly; the center of the surface of the support frame body is provided with a rectangular slag discharging gate, the top surface of the support frame body is provided with a gate plate stretching and closing opening communicated with the slag discharging gate, and two side grooves and a bottom groove are correspondingly formed along two side surfaces and the bottom surface of the slag discharging gate one by one; the center of the inlet end surface and the center of the outlet end surface of the support frame body are respectively provided with a flange plate in an integrated protruding mode; the pair of side nylon guide grooves are embedded in the two side grooves of the support frame body in a one-to-one correspondence manner; the bottom nylon guide groove is embedded in the bottom groove of the support frame body; the sealing assembly comprises a packing sealing ring arranged in a flashboard stretching and retracting port of the support frame body and a sealing pressing plate which is arranged on the top surface of the support frame body and presses on the packing sealing ring;

the gate comprises a gate body and a gate top; the width of the top of the gate plate is larger than that of the gate plate body, and two connecting holes are formed in two sides of the top of the gate plate respectively; the width of the flashboard body is matched with the distance between the pair of side nylon guide grooves, the flashboard body is movably arranged between the pair of side nylon guide grooves in the flashboard support frame, and the bottom of the flashboard body is inserted into the bottom nylon guide grooves when the slag discharging gate is completely closed;

the pair of oil cylinder supports are symmetrically fixed in the middle of the outer side surfaces of the two sides of the support frame body;

the two hydraulic oil cylinders are correspondingly arranged on the pair of oil cylinder supports one by one, and the free ends of the piston rods of the two hydraulic oil cylinders are respectively and correspondingly connected into the connecting holes on the two sides of the top of the flashboard through the connecting mechanisms;

the slag chute is L-shaped, the inlet end of the slag chute is connected to the flange plate at the outlet end of the third gate, and the included angle between the inlet end and the outlet end of the slag chute is 100-130 degrees.

In the slag discharge gate system of the screw conveyor of the earth pressure balance shield machine, a plurality of cleaning inflation holes communicated with the bottom groove are formed in the bottom surface of the support frame body, and a stainless steel ball valve is arranged at the outer end of each cleaning inflation hole; the supporting frame is characterized in that first oil injection holes communicated with the side grooves are respectively formed in the outer side faces of two sides of the supporting frame body, two second oil injection holes communicated with the extending and retracting openings of the flashboards are respectively formed in the top surface of the inlet end and the top surface of the outlet end of the supporting frame body, and grease nipples are respectively installed at the outer ends of the first oil injection holes and the second oil injection holes.

The above-mentioned earth pressure balance shield constructs slag tap gate system of screw conveyer of machine, wherein, the support frame body is embraced by a plurality of bolts by entrance point plate and exit end plate and is formed, and the thickness of entrance point plate is less than the thickness of exit end plate.

In the slag discharge gate system of the screw conveyor of the earth pressure balance shield machine, a displacement sensor is mounted between the surface of the top of the gate plate and the surface of the top of the support frame body; a flashboard closing limit switch is installed on the surface of the top of the support frame body, and a limit baffle is correspondingly installed on the surface of the top of the flashboard; a support rod is arranged on the flashboard support frame, and a flashboard opening limit switch corresponding to the limit baffle is arranged on the support rod.

In the slag discharging gate system of the screw conveyor of the earth pressure balance shield machine, the oil cylinder support comprises a base and two supports, the back surface of the base is welded in the middle of the outer side surfaces of the two sides of the support frame body, and two threaded blind holes are respectively formed in the two sides of the front surface of the base; the middle part of the surface of the bracket is provided with a through hole, and the side surface of the bracket is provided with two bolt through holes which are in one-to-one correspondence with the two threaded blind holes on one side of the base; the two perforated brackets are symmetrically arranged on the outer surface of the middle part of the hydraulic oil cylinder and are respectively arranged on two sides of the base in a one-to-one correspondence mode through two bolts.

In the above slag discharge gate system of the screw conveyor of the earth pressure balance shield machine, the connecting mechanism includes a joint bearing, a connector, a connecting pin and a stop piece; the joint bearing is embedded in a connecting hole at the top of the flashboard; the connector is fixed on the free end of a piston rod of the hydraulic oil cylinder, is U-shaped, and is provided with a pin hole coaxially on each of two side walls; the lower part of the connecting pin is provided with a stop groove; the thickness of the stop piece is matched with the width of a stop groove on the connecting pin, and two bolt fixing holes are formed in the surface of the stop piece; a piston rod of the hydraulic oil cylinder is connected with a connecting hole on one side of the top of the flashboard through a connector, a pin hole on the connector is aligned to a joint bearing in the connecting hole, and the connecting pin is inserted into the pin hole on one side wall of the connector and sequentially passes through the joint bearing in the connecting hole and the pin hole on the other side wall of the connector, so that a stop groove is positioned outside the other side wall of the connector; the stop piece is embedded in the stop groove of the connecting pin and is fixed on the other side wall of the connecting head through two bolts.

The above-mentioned soil pressure balance shield constructs the sluice gate system of slagging tap of screw conveyer of machine, wherein, the entrance point and the exit end of the pipe of slagging tap are equipped with the flange board respectively, and the flange board of the pipe exit end of just slagging tap with the flange board of third gate entrance point is connected.

The slag discharging gate system of the screw conveyer of the earth pressure balance shield machine comprises a funnel body and an L-shaped slag chute integrally connected with the outlet end of the funnel body, wherein an included angle between the inlet end and the outlet end of the slag chute is 100-130 degrees.

The slag discharge gate system of the screw conveyer of the earth pressure balance shield machine has the following characteristics: a first gate, a second gate, a slag discharging conduit, a third gate and a slag sliding hopper are sequentially arranged at a slag outlet of the screw conveyor. After the slag soil is firstly buffered by the first gate and the second gate, the slag soil is decelerated by the buffer of the arc-shaped slag discharging guide pipe, then flows to the third gate, is decelerated by the third gate, then flows to the slag sliding hopper, and finally falls to the belt conveyor after being decelerated by the buffer of the slag sliding hopper. The slag tap gate system of the invention realizes arch-shaped flow of the slag, effectively reduces the flow speed of the slag, enables the high-pressure slag in the screw conveyer to be decompressed in time, better controls the pressure of the soil bin of the shield machine, avoids the gushing phenomenon of the shield machine in the tunneling process and enables the shield machine to keep continuous tunneling.

Drawings

FIG. 1 is a schematic structural view of a slag discharge gate system of a screw conveyor of a shield tunneling machine according to the present invention;

FIG. 2 is a schematic view of the configuration of the tapping conduit in the tapping gate system of the present invention;

FIG. 3 is a front view of each gate in the slag gate system of the present invention;

FIG. 3a is a side view of FIG. 3;

FIG. 3b is a view from A-A in FIG. 3;

FIG. 3c is a view from the B-B direction in FIG. 3;

FIG. 3d is a front view of the support frame body in each gate of the present invention;

FIG. 3e is a view from the direction C-C in FIG. 3 d;

FIG. 3f is a front view of the segments of each gate of the present invention;

FIG. 3g is a front view of the cylinder support in each gate of the present invention;

FIG. 3h is a side view of the cylinder support in each gate of the present invention;

FIG. 3i is a top view of the cylinder support in each gate of the present invention;

FIG. 3j is a front view of a hydraulic ram in each gate of the present invention;

FIG. 3k is a side view of a hydraulic ram in each gate of the present invention;

FIG. 3l is a schematic view showing the structure of a connecting pin in each gate of the present invention;

FIG. 4 is a schematic view of the construction of the chute hopper of the slag gate system of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings.

Referring to fig. 1 to 4, the slag discharging gate system of the screw conveyor of the earth pressure balance shield machine of the present invention includes a first gate 1, a second gate 2, a slag discharging conduit 3, a third gate 4 and a slag chute 5, which are sequentially installed at a slag discharging port of the screw conveyor.

The first gate 1, the second gate 2 and the third gate 4 are the same in structure and size; and the opening direction of the first gate 1 is opposite to the rotation direction of the belt conveyor 6, the opening direction of the second gate 2 is the same as the rotation direction of the belt conveyor 6, and the opening direction of the third gate 4 is the same as the opening direction of the second gate 2.

The slag outlet conduit 3 is arc-shaped, and the included angle alpha between the inlet end and the outlet end is 120-160 degrees; the inlet end and the outlet end of the slag outlet conduit 3 are also respectively provided with a flange plate 30, and the flange plate 30 at the inlet end of the slag outlet conduit 3 is connected with the flange plate 20 at the outlet end of the second gate 2 through bolts.

The first gate 1, the second gate 2 and the third gate 4 respectively comprise a gate plate support frame 40, a gate plate 41, a pair of oil cylinder supports 42 and two hydraulic oil cylinders 43; wherein:

the ram support frame comprises a support frame body 40, a pair of side nylon guide grooves 403, a bottom nylon guide groove 404 and a sealing assembly 405; the support frame body 40 is formed by encircling an inlet end plate 401 and an outlet end plate 402 through a plurality of bolts, and the thickness of the inlet end plate 401 is smaller than that of the outlet end plate 402; a rectangular slag discharging gate 40A is arranged in the center of the surface of the support frame body 40, a gate plate extending and closing opening 40B communicated with the slag discharging gate 40A is arranged on the top surface of the support frame body 40, two side grooves 40C and a bottom groove 40D are arranged along two side surfaces and the bottom surface of the slag discharging gate 40A in a one-to-one correspondence mode, the cross sections of the side grooves 40C and the bottom groove 40D are both U-shaped, and the openings of the side grooves and the bottom groove are both towards the slag discharging gate 40A; a flange plate 40E is integrally protruded at each of the center of the inlet end surface and the center of the outlet end surface of the support frame body 40; the pair of side nylon guide grooves 403 are embedded in the two side grooves 40C of the support frame body 40 in a one-to-one correspondence manner; the bottom nylon guide groove 404 is embedded in the bottom groove 40D of the support frame body 40; the sealing assembly comprises a packing sealing ring 405 arranged in the flashboard stretching-closing port 40B of the support frame body 40 and a sealing pressure plate 406 which is arranged on the top surface of the support frame body 40 and is pressed on the packing sealing ring 405; the bottom surface of the support frame body 40 is provided with four cleaning air charging holes 407 communicated with the bottom groove 40D, and the outer end of each cleaning air charging hole 407 is provided with a stainless steel ball valve 44; two first oil injection holes 408 communicated with the side grooves 40C are respectively formed in the outer side faces of two sides of the support frame body 40, two second oil injection holes 409 communicated with the flashboard stretching-closing port 40B are respectively formed in the top surface of the inlet end and the top surface of the outlet end of the support frame body 40, and grease nipples 45 are respectively installed at the outer ends of the first oil injection holes 408 and the outer ends of the second oil injection holes 409.

The shutter 41 includes a shutter body 41A and a shutter top 41B; the width of the shutter body 41A is adapted to the distance between the pair of side nylon guide grooves 403, so that the shutter body 41A is movably mounted between the pair of side nylon guide grooves 403 inside the shutter support frame; the gate plate top 41B is integrally extended upwards from the gate plate body 41A, the width of the gate plate top 41B is greater than that of the gate plate body 41A, and two connecting holes 410 are respectively formed on two sides of the gate plate top 41B; a displacement sensor 46 is installed between the surface of the shutter top 41B and the top surface of the support frame body 40; a gate closing limit switch 471 is installed on the top surface of the support frame body 40, and a limit baffle 470 is correspondingly installed on the surface of the gate top 41B; a support rod 48 is arranged on the shutter plate support frame, and a shutter plate opening limit switch 472 corresponding to the limit baffle 470 is arranged on the support rod 48; or a proximity switch can be optionally installed to control the shutter limit.

A pair of oil cylinder supports 42 are symmetrically fixed in the middle of the outer side surfaces of the two sides of the support frame body 40; the oil cylinder support 42 comprises a base 421 and two supports 422, one side of the base 421 is welded in the middle of the outer side surfaces of the two sides of the support frame body 40, and two blind threaded holes are respectively formed in the two sides of the other side of the base 421; the middle part of the bracket 422 is provided with a through hole 420 and is embedded with a copper sleeve, the side surface of the bracket 422 is provided with two bolt through holes, and the two bolt through holes correspond to the two threaded blind holes of the base 421 one by one; the two brackets 422 are respectively mounted on both sides of the base 421 by two bolts in a one-to-one correspondence.

Two cylindrical flanges 430 are symmetrically arranged on the outer surface of the middle part of the cylinder body 431 of each hydraulic oil cylinder 43, and the two flanges 430 on the cylinder body 431 of each hydraulic oil cylinder 43 are correspondingly arranged in the through holes 420 on the two brackets 422 of the oil cylinder support 42; the free ends of the piston rods 432 of the two hydraulic cylinders 43 are connected in one-to-one correspondence to the connection holes 410 on both sides of the shutter top portion 41B through connection mechanisms, respectively.

The connecting mechanism comprises a joint bearing, a connecting head 441, a connecting pin 442 and a stop piece 443; the knuckle bearing is embedded in the connecting hole 410 of the top part 41B of the gate plate; the connector 441 is fixed on the free end of the piston rod of the hydraulic oil cylinder 43, the connector 441 is U-shaped, and two side walls of the connector are respectively and coaxially provided with a pin hole 440; the lower portion of the connecting pin 442 is formed with a stopper groove 4420; the thickness of the stopper 443 is adapted to the width of the stopper groove 4420 of the coupling pin 442, and two bolt fixing holes are formed in the surface of the stopper 443; a piston rod 432 of the hydraulic cylinder 43 is connected with the knuckle bearing in the connecting hole 410 of the ram top 41B through the connecting head 441, and a connecting pin 442 is inserted from a pin hole 440 on one side wall of the connecting head 441 and sequentially passes through the knuckle bearing in the connecting hole 410 of the ram top 41B and the pin hole 440 on the other side wall of the connecting head 441, so that a stopper groove 4420 is located outside the other side wall of the connecting head 441; the stopper 443 is fitted into the stopper groove 4420 of the coupling pin 442 and fixed to the other side wall of the coupling head 441 by two bolts.

The slag chute 5 comprises a vertical funnel body 51 and an L-shaped slag chute 52 connected with the funnel body, and an included angle beta between the inlet end and the outlet end of the slag chute 52 is 100-130 degrees; the inlet end of the slag chute 5 is provided with a flange plate 50 and is connected with a flange plate 40E at the outlet end of the third gate 4.

According to the slag discharging gate system of the screw conveyer of the earth pressure balance shield machine, the slag discharging guide pipe 3 and the slag sliding funnel 5 are both made of 16Mn wear-resistant steel plates, so that the abrasion deformation caused by long-term scouring of slag soil on a working surface can be reduced; the slag discharging guide pipe 3 and the slag sliding funnel 5 can guide the slag soil to buffer and decelerate the slag soil; the support frame body 40 and the gate plate 41 in each gate are made of 65Mn wear-resistant steel plates, so that abrasion and deformation caused by long-term scouring of the working surface by the muck can be reduced; the side nylon guide grooves 403 and the bottom nylon guide grooves 404 are both made of MC901 nylon plates, so that the lubricating gate plate 41 is supported, the operation condition is improved, the gate plate sealing is improved, the corrosion and clamping stagnation are reduced, and the water leakage and guniting caused by abrasion and deformation of the gate plate 41 are reduced; the packing seal ring 405 in the flashboard stretching-closing port 40B adopts carbon fiber packing, and has the functions of supporting the abrasion-resistant and lubricating the sealing flashboard 41; the sealing pressure plate 406 is made of a Q235 steel plate, the packing seal ring 405 is tightly locked on the pressure plate 406 through an adjusting bolt, and the frictional resistance and the sealing performance of the flashboard 41 can be adjusted. The first gate 1, the second gate 2 and the third gate 4 adopt hydraulic cylinders 43 to control the opening degree of a slag outlet gate 40A, the pressure of a soil bin of the shield machine is balanced by adjusting the slag outlet amount of the slag outlet gate 40A, and the leakage and the spewing of the screw conveyor are prevented; the connecting pin 442 is made of 40Cr round steel; the diameter of the hydraulic cylinder 43 is 80mm, the stroke is 730mm, the diameter of the piston rod is 45mm, and the pressure is 21 Mpa.

The bottom surface of the gate plate support frame is drilled with a cleaning inflation hole 407 and is provided with a hand-operated stainless steel ball valve 44, and the gate plate support frame can be connected with an air pipe for inflation and pressure maintaining to prevent muck from overflowing or connected with a water pipe for cleaning the gate plate 41 and improving muck; an external displacement sensor 46 and a limit switch are additionally arranged between the support frame body 40 and the flashboard 41, the displacement sensor 46 can detect the moving stroke of the hydraulic oil cylinder 43, and the limit switch can control and protect the hydraulic oil cylinder 43 from overloading; the outer side oil holes of the flashboard stretching-closing port 40B, the side nylon guide groove 403 and the bottom nylon guide groove 404 on the top of the support frame body 40 can lubricate the packing seal ring 405, protect the side nylon guide groove 403 and the bottom nylon guide groove 404, and enable the flashboard 41 to be sealed with the slag discharging gate opening 40A. The first gate 1, the second gate 2 and the third gate 4 are convenient to manufacture, disassemble, assemble and maintain in structure, suitable for being disassembled and replaced in different geologies, reasonable in system layout and stable in operation.

In the slag discharging gate system of the screw conveyer of the earth pressure balance shield machine, the power sources of two hydraulic oil cylinders 43 of the first gate 1, the second gate 2 and the third gate 4 are all driven by the hydraulic source of the shield machine, and a three-position four-way electromagnetic valve is additionally arranged for reversing control. When a gate button is opened, the right position of the three-position four-way electromagnetic valve is electrified and opened, pressure oil enters a rodless cavity of the hydraulic oil cylinder 43, a rod cavity of the hydraulic oil cylinder 43 returns oil through the hydraulic valve bank, a piston rod 432 of the hydraulic oil cylinder 43 begins to extend outwards to open the gate plate 41, the displacement sensor 46 begins to detect the moving stroke of the hydraulic oil cylinder 43, the gate plate 41 extends to the terminal, when the limit baffle 470 touches the gate plate opening limit switch 472, the three-position four-way electromagnetic valve is powered off, and the hydraulic oil cylinder 43 stops acting; when the gate button is closed, the left position of the three-position four-way electromagnetic valve is electrified and opened, pressure oil enters a rod cavity of the hydraulic oil cylinder 43, a rodless cavity of the hydraulic oil cylinder 43 returns oil through the hydraulic valve group, a piston rod 432 of the hydraulic oil cylinder 43 begins to retract inwards to close the gate plate 41, the displacement sensor 46 begins to detect the moving stroke of the hydraulic oil cylinder 43, the gate plate 41 retracts to the terminal, when the limit baffle 470 touches the gate plate closing limit switch 471, the three-position four-way electromagnetic valve is powered off, and the hydraulic oil cylinder 43 stops acting.

When the slag hole of the screw conveyer has severe spewing, the rotating speeds of the cutter head and the screw conveyer are firstly adjusted, the pressure of the soil bin is checked, the temperature of the slag is detected, the shield machine is pushed forward to establish a stable tunnel face, the first gate 1, the second gate 2 and the third gate 4 are closed, the spewing reason of the slag hole of the screw conveyer is analyzed, and relevant measures are conveniently taken to solve the spewing problem.

When the earth pressure balance shield machine excavates and tunnels at the rock-soil transition section, the rotating speed of the cutter head is controlled to be 0.8-1.2 r/min, the rotating speed of the screw conveyor is 1.0-3.0 r/min, the propelling speed is controlled to be 8-10 mm/min, and the pressure in the earth bin is about 2.0 bar. According to the stratum structure and the gushing degree, the tunneling parameters are changed in time, the temperature and the pressure in the soil bin are controlled, the injection amount of foam and air is reduced properly, and the pressure balance and the stability of the soil bin are gradually kept. After the screw conveyer starts to start, the muck is conveyed from the soil bin to the slag discharging gate system through the blades of the screw conveyer, the opening degree of the first gate 1 is controlled to be 10% -20%, the muck flows to the second gate 2 after being buffered by the first gate 1, the opening degree of the second gate 2 is controlled to be 30% -40%, the muck flows to the slag discharging conduit 3 after being buffered by the second gate 2 and flows to the third gate 4 after being buffered and decelerated by the slag discharging conduit 3, the opening degree of the third gate 4 is controlled to be 50% -60%, the muck flows to the belt conveyer 6 after being buffered by the third gate 4 and is buffered and decelerated by the slag chute 5 again. The slag discharging gate system of the invention realizes arch-shaped flow of the slag, effectively reduces the flow speed of the slag and reduces the spewing of the slag discharging gate of the screw conveyor.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.