A slag gate system for a screw conveyor of an earth pressure balance shield machine

Abstract

The invention discloses a slag gate system for a screw conveyor of an earth pressure balance shield machine, comprising a first gate, a second gate, a slag discharge conduit, a third gate and a slag hopper which are sequentially installed at the slag discharge port of the screw conveyor. Each gate comprises a gate support frame, a gate, a pair of oil cylinder supports and two hydraulic oil cylinders; the gate support frame comprises a support frame body, a nylon guide groove and a sealing assembly; the gate comprises a gate body and a gate top; a pair of oil cylinder supports are fixed to the middle of the outer side surfaces on both sides of the support frame body; the two hydraulic oil cylinders are respectively installed on a pair of oil cylinder supports, and the piston rods of the two hydraulic oil cylinders are respectively connected to both sides of the gate top through a connecting mechanism; the angle between the inlet and outlet ends of the slag discharge conduit is 120° to 160°; the angle between the inlet and outlet ends of the slag hopper is 100° to 130°. The invention can effectively reduce the flow velocity of slag and avoid the occurrence of gushing phenomenon during the excavation process of the shield machine.

Description

Technical Field

[0001] The invention relates to a slag discharge gate system of a screw conveyor of an earth pressure balance shield machine. Background Art

[0002] The hydraulic motor of the shield machine drives the cutterhead to rotate, and the debris cut from the excavation face enters the cutterhead opening and falls to the bottom of the soil bin, and is transported to the slag discharge gate by a screw conveyor, and then discharged onto the belt conveyor. The belt conveyor unloads the debris into the dump truck parked on the track, and transports it to the slag outlet outside the tunnel, where it is hoisted to the ground and poured into the debris pit.

[0003] During construction, if the earth pressure balance shield machine encounters bedrock protrusions and weathered rock layers in the entire section, and the soft and hard rock transition section has more developed fissure water, the water content in the soil bin will increase, and the upper soil layer is easily disturbed and collapsed by water immersion, resulting in over-excavation of earthwork, high-temperature gushing of hard rock cutting below, and abnormal noises, soil pressure fluctuations and eccentric wear of rollers during shield advancement. In the water catchment area where soft soil and hard rock meet, the slag discharged by the screw conveyor cannot meet the requirements of belt sticky transportation, and the slag carried out makes the excavation of the face uncontrollable. The excavation process is prone to face instability, soil erosion and surface settlement. When the shield machine stops excavating, the slag gate of the screw conveyor sprays water and leaks slurry, which has an extremely adverse impact on the safety of shield construction and production progress. The analysis of the screw conveyor gushing problem found that the main reasons were the relatively developed fissure water in the rock-soil transition section, the uneven proportion of soil and water in the face soaking collapse and over-excavation, the high-temperature cutting of the upper soft and lower hard shield machine cutter head to generate airflow, the increased soil pressure flowed to the slag gate of the screw conveyor, and the formation of a cycle that affected the fluctuation and instability of the soil bin pressure. In order to prevent the gushing phenomenon, the shield machine manufacturers usually adopt the method of setting a soil bin gate at the front end of the screw conveyor and installing two slag gates at the rear end. The soil bin gate is opened from the left and right by two gates, and the opening opens from the middle to both sides. The advantage is that the space occupied is small, but the slag flow is not smooth and is easy to deposit at the gate, and it will be stuck in the gap and easily jam the soil bin gate switch. When the slag gate of the screw conveyor encounters gushing, the gushing sediment acts on the gate of the slag gate, forming an increased resistance of the slag gate and cannot be closed normally, which is easy to cause gushing and even ground collapse. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a slag gate system for the screw conveyor of an earth pressure balance shield machine, which can effectively reduce the flow speed of the slag, so that the high-pressure slag in the screw conveyor can be depressurized in time, better control the earth bin pressure of the shield machine, avoid gushing during the excavation of the shield machine, and enable the shield machine to maintain continuous excavation.

[0005] The object of the present invention is achieved as follows: A slag gate system for a screw conveyor of an earth pressure balance shield machine comprises a first gate and a second gate, a slag discharge conduit, a third gate and a slag hopper which are sequentially installed at a slag discharge port of the screw conveyor; wherein,

[0006] The first gate, the second gate and the third gate have the same structure and size, and 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;

[0007] The slag discharge conduit is arc-shaped and the angle between the inlet end and the outlet end is 120° to 160°;

[0008] The first gate, the second gate and the third gate each include a gate support frame, a gate, a pair of cylinder supports and two hydraulic cylinders;

[0009] The gate support frame includes a support frame body, a pair of side nylon guide grooves, a bottom nylon guide groove and a sealing assembly; a rectangular slag gate is opened in the center of the surface of the support frame body, and a gate extension and retraction opening connected to the slag gate is opened on the top surface of the support frame body, and two side grooves and a bottom groove are opened along the two side surfaces and bottom surfaces of the slag gate in a one-to-one correspondence; a flange plate is integrally convexly provided at the center of the inlet end surface and the center of the outlet end surface of the support frame body; a pair of side nylon guide grooves are embedded in the two side grooves of the support frame body in a one-to-one correspondence; the bottom nylon guide groove is embedded in the bottom groove of the support frame body; the sealing assembly includes a packing sealing ring arranged in the gate extension and retraction opening of the support frame body and a sealing pressure plate installed on the top surface of the support frame body and pressed on the packing sealing ring;

[0010] The gate plate includes a gate plate body and a gate plate top; the width of the gate plate top is greater than the width of the gate plate body, and a connecting hole is respectively provided on both sides of the gate plate top; the width of the gate plate body is adapted to the spacing of a pair of side nylon guide grooves, and the gate plate body is movably mounted between the pair of side nylon guide grooves inside the gate plate support frame, and the bottom of the gate plate body is inserted into the bottom nylon guide groove when the slag discharge gate is fully closed;

[0011] A pair of oil cylinder supports are symmetrically fixed at the middle of the outer sides of both sides of the support frame body;

[0012] Two hydraulic cylinders are mounted on a pair of cylinder supports in a one-to-one correspondence, and the free ends of the piston rods of the two hydraulic cylinders are connected to the connecting holes on both sides of the top of the gate plate in a one-to-one correspondence through connecting mechanisms;

[0013] The slag hopper is L-shaped and its inlet end is connected to the flange plate at the outlet end of the third gate. The angle between the inlet end and the outlet end of the slag hopper is 100° to 130°.

[0014] The above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, wherein a plurality of cleaning and inflation holes connected to the bottom groove are opened on the bottom surface of the support frame body, and a stainless steel ball valve is installed at the outer end of each cleaning and inflation hole; a first oil filling hole connected to the side groove is opened on each of the outer sides of the two sides of the support frame body, and two second oil filling holes connected to the gate extension and retraction port are opened on the top surface of the inlet end and the top surface of the outlet end of the support frame body, and grease nipples are installed at the outer ends of the first oil filling hole and the second oil filling hole.

[0015] In the above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, the support frame body is formed by an inlet end plate and an outlet end plate embraced by multiple bolts, and the thickness of the inlet end plate is smaller than the thickness of the outlet end plate.

[0016] The above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, wherein a displacement sensor is installed between the surface of the top of the gate and the top surface of the support frame body; a gate closing limit switch is installed on the top surface of the support frame body, and a limit baffle is correspondingly installed on the surface of the top of the gate; a support rod is installed on the gate support frame, and a gate opening limit switch corresponding to the limit baffle is installed on the support rod.

[0017] The above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, wherein the cylinder support includes a base and two brackets, the back of the base is welded to the middle of the outer side surfaces on both sides of the support frame body, and two threaded blind holes are respectively opened on the two sides of the front of the base; a through hole is opened in the middle of the surface of the bracket, and two bolt through holes corresponding to the two threaded blind holes on one side of the base are opened on the side of the bracket; the two perforated brackets are symmetrically installed on the outer surface of the middle part of the hydraulic cylinder, and are respectively installed on both sides of the base by two bolts in a one-to-one correspondence.

[0018] The above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, wherein the connecting mechanism includes a joint bearing, a connecting head, a connecting pin and a stopper; the joint bearing is embedded in the connecting hole at the top of the gate plate; the connecting head is fixed to the free end of the piston rod of the hydraulic cylinder, the connecting head is U-shaped and a pin hole is coaxially opened on each of the two side walls; a stopper groove is opened at the lower part of the connecting pin; the thickness of the stopper groove is adapted to the width of the stopper groove on the connecting pin, and two bolt fixing holes are opened on the surface of the stopper groove; the piston rod of the hydraulic cylinder is connected to the connecting hole on one side of the top of the gate plate through the connecting head, and the pin hole on the connecting head is aligned with the joint bearing in the connecting hole, the connecting pin is inserted from the pin hole of one side wall of the connecting head, and passes through the joint bearing in the connecting hole and the pin hole of the other side wall of the connecting head in turn, so that the stopper groove is located outside the other side wall of the connecting head; the stopper groove is embedded in the stopper groove of the connecting pin and is fixed to the other side wall of the connecting head by two bolts.

[0019] In the above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, the inlet and outlet ends of the slag discharge conduit are respectively provided with flange plates, and the flange plate at the outlet end of the slag discharge conduit is connected to the flange plate at the inlet end of the third gate.

[0020] The above-mentioned slag gate system of the screw conveyor of the earth pressure balance shield machine, wherein the slag hopper includes a funnel body and an L-shaped slag chute integrally connected to the outlet end of the funnel body, and the angle between the inlet end and the outlet end of the slag hopper is 100° to 130°.

[0021] The slag gate system of the screw conveyor of the earth pressure balance shield machine of the present invention has the following characteristics: the first gate, the second gate, the slag discharge conduit, the third gate and the slag hopper are sequentially installed at the slag discharge port of the screw conveyor. The slag first passes through the buffering of the first gate and the second gate, then passes through the buffering and deceleration of the arc-shaped slag discharge conduit, and then flows to the third gate, and then flows to the slag hopper after being decelerated by the third gate, and finally falls on the belt conveyor after being buffered and decelerated by the slag hopper. The slag gate system of the present invention enables the slag to flow in a "bow" shape, effectively reducing the flow speed of the slag, so that the high-pressure slag in the screw conveyor can be depressurized in time, better controlling the soil bin pressure of the shield machine, avoiding the gushing phenomenon of the shield machine during the excavation process, and enabling the shield machine to maintain continuous excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a slag gate system of a screw conveyor of a shield machine of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the slag discharge conduit in the slag discharge gate system of the present invention;

[0024] Figure 3 It is a front view of each gate in the slag gate system of the present invention;

[0025] Figure 3a yes Figure 3 Side view in;

[0026] Figure 3b yes Figure 3 AA view in the figure;

[0027] Figure 3c yes Figure 3 BB view in the figure;

[0028] Figure 3d It is a front view of the support frame body in each gate of the present invention;

[0029] Figure 3e yes Figure 3d CC view in the figure;

[0030] Figure 3f is a front view of the gate in each gate of the present invention;

[0031] Figure 3g It is a front view of the oil cylinder support in each gate of the present invention;

[0032] Figure 3h is a side view of the oil cylinder support in each gate of the present invention;

[0033] Figure 3i is a top view of the oil cylinder support in each gate of the present invention;

[0034] Figure 3j It is a front view of the hydraulic cylinder in each gate of the present invention;

[0035] Figure 3k is a side view of the hydraulic cylinder in each gate of the present invention;

[0036] Figure 3l It is a schematic diagram of the structure of the connecting pins in each gate of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the slag hopper in the slag discharge gate system of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] See also Figures 1 to 4The slag gate system of the screw conveyor of the earth pressure balance shield machine of the present invention comprises a first gate 1, a second gate 2, a slag discharge conduit 3, a third gate 4 and a slag hopper 5 which are sequentially installed at the slag discharge port of the screw conveyor.

[0040] The structures and dimensions of the first gate 1, the second gate 2 and the third gate 4 are the same; 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.

[0041] The slag discharge conduit 3 is arc-shaped and the angle α between the inlet and outlet ends is 120°~160°; the inlet and outlet ends of the slag discharge conduit 3 are also respectively provided with flange plates 30, and the flange plate 30 at the inlet end of the slag discharge conduit 3 is connected to the flange plate 20 at the outlet end of the second gate 2 by bolts.

[0042] The first gate 1, the second gate 2 and the third gate 4 each include a gate support frame 40, a gate 41, a pair of cylinder supports 42 and two hydraulic cylinders 43; wherein:

[0043] The gate support frame includes 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 an inlet end plate 401 and an outlet end plate 402 being embraced by a plurality of bolts, and the thickness of the inlet end plate 401 is less than the thickness of the outlet end plate 402; a rectangular slag gate 40A is provided in the center of the surface of the support frame body 40, a gate extension opening 40B connected to the slag gate 40A is provided on the top surface of the support frame body 40, and two side grooves 40C and a bottom groove 40D are provided along the two side surfaces and the bottom surface of the slag gate 40A in a one-to-one correspondence, and the cross-sections of the side grooves 40C and the cross-sections of the bottom grooves 40D are both U-shaped and the openings are both facing the slag gate 40A; a flange plate 40E is respectively provided in the center of the inlet end surface and the center of the outlet end surface of the support frame body 40; a pair of side nylon guide grooves 403 are provided in a one-to-one correspondence. Correspondingly embedded in the two side grooves 40C of the support frame body 40; the bottom nylon guide groove 404 is embedded in the bottom groove 40D of the support frame body 40; the sealing assembly includes a packing seal 405 arranged in the gate extension and retraction port 40B of the support frame body 40 and a sealing pressure plate 406 installed on the top surface of the support frame body 40 and pressed on the packing seal 405; four cleaning and inflation holes 407 connected to the bottom groove 40D are opened on the bottom surface of the support frame body 40, and a stainless steel ball valve 44 is installed at the outer end of each cleaning and inflation hole 407; a first oil filling hole 408 connected to the side groove 40C is respectively opened on the outer sides of both sides of the support frame body 40, and two second oil filling holes 409 connected to the gate extension and retraction port 40B are respectively opened on the top surface of the inlet end and the top surface of the outlet end of the support frame body 40, and a grease nipple 45 is installed on the outer end of the first oil filling hole 408 and the outer end of the second oil filling hole 409.

[0044] The gate 41 includes a gate body 41A and a gate top 41B; the width of the gate body 41A is adapted to the spacing between a pair of side nylon guide grooves 403, so that the gate body 41A can be movably installed between a pair of side nylon guide grooves 403 inside the gate support frame; the gate top 41B is obtained by extending the gate body 41A upward as a whole, and the width of the gate top 41B is greater than the width of the gate body 41A, and a connecting hole 410 is opened on each side of the gate top 41B; a displacement sensor 46 is installed between the surface of the gate 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 installed on the gate support frame, and a gate opening limit switch 472 corresponding to the limit baffle 470 is installed on the support rod 48; or a proximity switch can be installed to control the gate limit.

[0045] A pair of cylinder supports 42 are symmetrically fixed on the middle of the outer side surfaces on both sides of the support frame body 40; the cylinder support 42 includes a base 421 and two brackets 422, one side of the base 421 is welded to the middle of the outer side surfaces on both sides of the support frame body 40, and two threaded blind holes are respectively provided on both sides of the other side of the base 421; a through hole 420 is provided in the middle of the bracket 422 and a copper sleeve is embedded therein, and two bolt through holes are provided on the side of the bracket 422, and the two bolt through holes correspond one-to-one to the two threaded blind holes of the base 421; the two brackets 422 are respectively installed on both sides of the base 421 by two bolts.

[0046] Two cylindrical flanges 430 are symmetrically arranged on the middle outer surface of the cylinder body 431 of each hydraulic cylinder 43, and the two flanges 430 on the cylinder body 431 of each hydraulic cylinder 43 are installed one-to-one in the through holes 420 on the two brackets 422 of the cylinder support 42; the free ends of the piston rods 432 of the two hydraulic cylinders 43 are respectively connected one-to-one to the connecting holes 410 on both sides of the gate top 41B through a connecting mechanism.

[0047] The connecting mechanism includes a joint bearing, a connecting head 441, a connecting pin 442 and a stopper 443; the joint bearing is embedded in the connecting hole 410 at the top 41B of the gate plate; the connecting head 441 is fixed to the free end of the piston rod of the hydraulic cylinder 43, the connecting head 441 is U-shaped and has a pin hole 440 coaxially provided on each of the two side walls; a stopper groove 4420 is provided at the lower part of the connecting pin 442; the thickness of the stopper 443 is adapted to the width of the stopper groove 4420 on the connecting pin 442, and two bolt fixing holes are provided on the surface of the stopper 443; the hydraulic cylinder The piston rod 432 of 43 is connected to the joint bearing in the connecting hole 410 of the gate top 41B through the connecting head 441, and the connecting pin 442 is inserted into the pin hole 440 on one side wall of the connecting head 441, and passes through the joint bearing in the connecting hole 410 of the gate top 41B and the pin hole 440 on the other side wall of the connecting head 441 in sequence, so that the retaining groove 4420 is located outside the other side wall of the connecting head 441; the retaining plate 443 is embedded in the retaining groove 4420 of the connecting pin 442 and is fixed to the other side wall of the connecting head 441 by two bolts.

[0048] The slag hopper 5 includes an upright funnel body 51 and an L-shaped slag chute 52 connected to the funnel body, and the angle β between the inlet end and the outlet end of the slag chute 52 is 100°~130°; the inlet end of the slag hopper 5 is provided with a flange plate 50 and is connected to the flange plate 40E at the outlet end of the third gate 4.

[0049] The slag gate system of the screw conveyor of the earth pressure balance shield machine of the present invention, the slag discharge conduit 3 and the slag chute 5 are made of 16Mn wear-resistant steel plate, which can reduce the wear and deformation of the slag soil due to long-term scouring of the working surface; the slag discharge conduit 3 and the slag chute 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 plate, which can reduce the wear and deformation of the slag soil due to long-term scouring of the working surface; the side nylon guide groove 403 and the bottom nylon guide groove 404 They are all made of MC901 nylon plate, which plays a role in supporting and lubricating the gate plate 41 to improve the operating conditions, improve the gate plate sealing, reduce rust and seizure, and reduce the wear and deformation of the gate plate 41 to cause leakage and spraying; the packing seal 405 in the gate plate extension and retraction port 40B is made of carbon fiber packing, which has the function of supporting the wear-resistant and lubricating sealing gate plate 41; the sealing pressure plate 406 is made of Q235 steel plate, and the friction resistance and sealing performance of the gate plate 41 can be adjusted by adjusting the bolts to lock the pressure plate 406 with the packing seal 405. The first gate 1, the second gate 2 and the third gate 4 all use hydraulic cylinders 43 to control the opening degree of the slag discharge gate 40A. By adjusting the amount of slag discharge from the slag discharge gate 40A, the soil bin pressure of the shield machine is balanced to prevent leakage and gushing of the screw conveyor; the connecting pin 442 is made of 40Cr round steel; the cylinder diameter of the hydraulic cylinder 43 = 80mm, the stroke = 730mm, the diameter of the piston rod = 45mm, and the pressure = 21Mpa.

[0050] The bottom surface of the gate support frame is drilled and tapped for cleaning and inflation holes 407 and a hand-operated stainless steel ball valve 44 is installed, which can be connected to an air pipe for inflation and pressure maintenance to prevent the overflow of slag, or connected to a water pipe for cleaning the gate 41 and improving the slag; an external displacement sensor 46 and a limit switch are added between the support frame body 40 and the gate 41. The displacement sensor 46 can detect the movement stroke of the hydraulic cylinder 43, and the limit switch can control and protect the hydraulic cylinder 43 from overload; the outer oil filling holes of the gate extension and retraction opening 40B, the side nylon guide groove 403 and the bottom nylon guide groove 404 at the top of the support frame body 40 can lubricate the packing seal 405, protect the side nylon guide groove 403 and the bottom nylon guide groove 404, and make the gate 41 and the slag gate 40A sealed. The structures of the first gate 1, the second gate 2 and the third gate 4 are convenient for production, disassembly and maintenance, suitable for disassembly and replacement in different geological conditions, and the system layout is reasonable and runs smoothly.

[0051] In the slag gate system of the screw conveyor of the earth pressure balance shield machine of the present invention, the power sources of the two hydraulic 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 solenoid valve is installed for switching control. When the gate button is opened, the right position of the three-position four-way solenoid valve is energized and opened, and the pressure oil enters the rodless chamber of the hydraulic cylinder 43, and the rod chamber of the hydraulic cylinder 43 returns oil through the hydraulic valve group, and the piston rod 432 of the hydraulic cylinder 43 begins to extend outward to open the gate plate 41, and the displacement sensor 46 begins to detect the movement stroke of the hydraulic cylinder 43. When the gate plate 41 extends to the terminal so that the limit baffle 470 touches the gate plate opening limit switch 472, the three-position four-way solenoid valve is powered off, and the hydraulic cylinder 43 stops moving; When the gate button is closed, the left position of the three-position four-way solenoid valve is energized and opened, and the pressure oil enters the rod chamber of the hydraulic cylinder 43. The rodless chamber of the hydraulic cylinder 43 returns oil through the hydraulic valve group, and the piston rod 432 of the hydraulic cylinder 43 begins to retract inward to close the gate 41. The displacement sensor 46 begins to detect the movement stroke of the hydraulic cylinder 43. When the gate 41 retracts to the terminal so that the limit baffle 470 touches the gate closing limit switch 471, the three-position four-way solenoid valve is de-energized and the hydraulic cylinder 43 stops moving.

[0052] When serious gushing occurs at the slag outlet of the screw conveyor, first adjust the rotation speed of the cutter head and the screw conveyor, check the soil bin pressure and the slag temperature, push the shield machine forward to establish a stable heading, close the first gate 1, the second gate 2 and the third gate 4, analyze the cause of the gushing at the slag outlet of the screw conveyor, and take relevant measures to solve the gushing problem.

[0053] When the earth pressure balance shield machine starts excavation in the rock-soil transition section, the speed of the cutterhead is controlled at 0.8-1.2r / min, the speed of the screw conveyor is 1.0-3.0r / min, the propulsion speed is controlled at 8-10mm / min, and the pressure inside the soil bin is about 2.0bar. According to the stratum structure and the degree of gushing, the excavation parameters are changed in time, the temperature and pressure in the soil bin are controlled, the amount of foam and air injection is appropriately reduced, and the pressure balance and stability of the soil bin are gradually maintained. When the screw conveyor starts to start, the slag is transported from the soil bin to the slag gate system through the blades of the screw conveyor. First, the opening of the first gate 1 is controlled to be 10% to 20%. After the slag passes through the buffer of the first gate 1, it flows to the second gate 2. The opening of the second gate 2 is controlled to be 30% to 40%. After the buffer of the second gate 2, the slag flows to the slag conduit 3, and after the buffering and deceleration of the slag conduit 3, it flows to the third gate 4. The opening of the third gate 4 is controlled to be 50% to 60%. After the buffer of the third gate 4, the slag passes through the slag funnel 5 again for buffering and deceleration, and finally flows to the belt conveyor 6. The slag gate system of the present invention enables the slag to realize a "bow" flow, effectively reduces the flow speed of the slag, and reduces the gushing of the slag gate of the screw conveyor.

[0054] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A slag gate system for a screw conveyor of an earth pressure balance shield machine, comprising a first gate and a second gate sequentially installed at a slag outlet of the screw conveyor; characterized in that: The slag gate system also includes a slag discharge conduit, a third gate and a slag hopper connected in sequence to the outlet end of the second gate; The first gate, the second gate and the third gate have the same structure and size, and 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 discharge conduit is arc-shaped and the angle between the inlet end and the outlet end is 120° to 160°; The first gate, the second gate and the third gate each include a gate support frame, a gate, a pair of cylinder supports and two hydraulic cylinders; The gate support frame includes a support frame body, a pair of side nylon guide grooves, a bottom nylon guide groove and a sealing assembly; a rectangular slag gate is opened in the center of the surface of the support frame body, and a gate extension and retraction opening connected to the slag gate is opened on the top surface of the support frame body, and two side grooves and a bottom groove are opened along the two side surfaces and bottom surfaces of the slag gate in a one-to-one correspondence; a flange plate is integrally convexly provided at the center of the inlet end surface and the center of the outlet end surface of the support frame body; a pair of side nylon guide grooves are embedded in the two side grooves of the support frame body in a one-to-one correspondence; the bottom nylon guide groove is embedded in the bottom groove of the support frame body; the sealing assembly includes a packing sealing ring arranged in the gate extension and retraction opening of the support frame body and a sealing pressure plate installed on the top surface of the support frame body and pressed on the packing sealing ring; The gate plate includes a gate plate body and a gate plate top; the width of the gate plate top is greater than the width of the gate plate body, and a connecting hole is respectively provided on both sides of the gate plate top; the width of the gate plate body is adapted to the spacing of a pair of side nylon guide grooves, and the gate plate body is movably mounted between the pair of side nylon guide grooves inside the gate plate support frame, and the bottom of the gate plate body is inserted into the bottom nylon guide groove when the slag discharge gate is fully closed; A pair of oil cylinder supports are symmetrically fixed at the middle of the outer sides of both sides of the support frame body; Two hydraulic cylinders are mounted on a pair of cylinder supports in a one-to-one correspondence, and the free ends of the piston rods of the two hydraulic cylinders are connected to the connecting holes on both sides of the top of the gate plate in a one-to-one correspondence through connecting mechanisms; The slag funnel is L-shaped and its inlet end is connected to the flange plate at the outlet end of the third gate, and the angle between the inlet end and the outlet end of the slag funnel is 100° to 130°; The oil cylinder support comprises a base and two brackets, the back of the base is welded to the middle of the outer side surfaces of both sides of the support frame body, and two threaded blind holes are respectively provided on the two sides of the front of the base; a through hole is provided in the middle of the surface of the bracket, and two bolt through holes corresponding to the two threaded blind holes on one side of the base are provided on the side of the bracket; the two perforated brackets are symmetrically installed on the outer surface of the middle part of the hydraulic oil cylinder, and are respectively installed on the two sides of the base by two bolts corresponding to each other; The connecting mechanism includes a joint bearing, a connecting head, a connecting pin and a stop plate; the joint bearing is embedded in the connecting hole at the top of the gate plate; the connecting head is fixed on the free end of the piston rod of the hydraulic cylinder, the connecting head is U-shaped and a pin hole is coaxially opened on each of the two side walls; a stop groove is opened at the lower part of the connecting pin; the thickness of the stop plate is adapted to the width of the stop groove on the connecting pin, and two bolt fixing holes are opened on the surface of the stop plate; the piston rod of the hydraulic cylinder is connected to the connecting hole on one side of the top of the gate plate through the connecting head, and the pin hole on the connecting head is aligned with the joint bearing in the connecting hole, the connecting pin is inserted from the pin hole of one side wall of the connecting head, and passes through the joint bearing in the connecting hole and the pin hole of the other side wall of the connecting head in turn, so that the stop groove is located outside the other side wall of the connecting head; the stop plate is embedded in the stop groove of the connecting pin and is fixed to the other side wall of the connecting head by two bolts.

2. The slag gate system of the screw conveyor of the earth pressure balance shield machine according to claim 1, characterized in that: A plurality of cleaning and air-filling holes connected to the bottom groove are provided on the bottom surface of the support frame body, and a stainless steel ball valve is installed at the outer end of each cleaning and air-filling hole; a first oil filling hole connected to the side groove is provided on each of the outer sides of the two sides of the support frame body, and two second oil filling holes connected to the gate extension and retraction port are provided on each of the top surfaces of the inlet end and the outlet end of the support frame body, and grease nipples are installed at the outer ends of the first oil filling hole and the second oil filling hole.

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

4. The slag gate system of the screw conveyor of the earth pressure balance shield machine according to claim 1, characterized in that: A displacement sensor is installed between the surface of the top of the gate and the top surface of the support frame body; a gate closing limit switch is installed on the top surface of the support frame body, and a limit baffle is installed correspondingly on the surface of the top of the gate; a support rod is installed on the gate support frame, and a gate opening limit switch corresponding to the limit baffle is installed on the support rod.

5. The slag gate system of the screw conveyor of the earth pressure balance shield machine according to claim 1, characterized in that: The inlet end and the outlet end of the slag discharge conduit are respectively provided with flange plates, and the flange plate at the outlet end of the slag discharge conduit is connected to the flange plate at the inlet end of the third gate.

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