Slag stone screening system and shield tunneling machine comprising same

Abstract

The utility model provides a slag stone screening system and a shield tunneling machine comprising the same, and belongs to the technical field of special mechanical equipment for tunnel construction. The slag stone screening system comprises a quarrying box as well as a screening assembly and a driving assembly which are arranged in the quarrying box; the fixed end of the driving assembly is fixedly connected with the quarrying box, and the driving end of the driving assembly is connected with the screening assembly; the quarrying box comprises a lower box body assembly and an upper box body assembly which are connected with each other, and the screening assembly is arranged between the lower box body assembly and the upper box body assembly; the lower box body assembly comprises a lower frame and a supporting plate arranged in a cavity of the lower frame, the cavity of the lower frame is divided into a slag slurry cavity and a slag storage cavity through the supporting plate, and a grating plate used for screening slag stone is further arranged in the slag storage cavity. According to the stone quarrying device, the screening assembly is adopted for conducting primary screening on stone slag, and then the stone slag subjected to primary screening is subjected to secondary screening through the grating plate in the stone quarrying box; and by arranging a multi-stage screening structure, large-particle-size slag stones in the slurry are rapidly filtered and screened, and the risk of pump blockage is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of special mechanical equipment for tunnel construction, and particularly relates to a slag and stone screening system and a shield machine comprising the system. Background Art

[0002] In recent years, with the rapid economic development and the accelerated urbanization process, a large number of tunnel projects such as municipal pipelines, energy transmission, and transportation tracks have been planned and constructed. Slurry balance shield machines have been widely used in the construction of the above tunnels due to their many advantages such as safety, reliability, greenness and efficiency.

[0003] The slurry circulation system is an integral component of the slurry shield machine. To prevent large-diameter debris from getting stuck in the pump and blocking the rear pipes, preventing the slurry pump from shutting down and ensuring the normal operation of the circulation system, a quarrying box is usually installed before the P2.1 pump to filter out large debris larger than the maximum pass size of the slurry pump. Therefore, a properly designed quarrying box is one of the key factors in ensuring normal slag discharge from the circulation system and efficient shield construction.

[0004] According to the technical novelty search, the existing technologies are mainly divided into the following categories:

[0005] (1) Self-weight drop rock box: This rock box has a certain volume of box below the main slurry discharge pipe. The slurry inlet and outlet are both located at the upper part of the box. A grille is provided at the connection between the rear part of the box and the pipeline to limit the entry of large-diameter rocks into the subsequent pipeline. This structural form causes the rock box to be filled with rocks and slurry of various diameters after the circulation system has been running for a short time, resulting in a low collection rate of large-diameter rocks during subsequent operation of the circulation system. The rock box often becomes blocked, affecting the construction progress. Representative patents: "CN201821616756.9" and "CN202323456205.4"

[0006] (2) Vertical grid-type quarrying box: This quarrying box is arranged on the slurry discharge pipe, with the slurry inlet and outlet at both ends of the box body, and the grid is arranged vertically in the middle of the box body. The slurry flow rate drives the stones and debris through the grid. However, small-sized stones are blocked in front of the grid, and the quarrying box area in front of the grid has a large blind spot, causing the area in front of the grid to be blocked or even blocked by stones and clay of various diameters, which not only affects the normal operation of the mud-water circulation system, but also reduces the efficiency of box opening and cleaning. Representative patent "CN201621469031.2";

[0007] (3) Horizontal grid-type quarrying box: The quarrying box grid is arranged horizontally, with the slurry inlet at the top and the slurry outlet at the bottom. The inner shell of the grid is equipped with a stirring device. The passing rate of this quarrying box is slightly higher than that of the vertical grid-type quarrying box, but there are still blind spots where small-diameter debris and rocks are accumulated. There are also multiple stones overlapping and blocking the grid, resulting in a reduction in the flow area of ​​the grid. When the blockage is serious, the box has to be opened for cleaning, affecting the continuous operation and normal operation of the mud and water circulation system. Representative patent "CN201710629857.3";

[0008] (4) Drum screening quarrying box: This quarrying box adopts a horizontally arranged drum screen, with the slurry inlet at one end of the drum screen and the slurry outlet at the bottom of the drum screen. The quarrying box continuously rotates the drum screen to filter out small-sized slag and mud, and can screen out large-sized slag. However, there is still a risk of clogging of the screening holes, resulting in a reduction in the flow area of ​​the screening holes. When the clogging is serious, not only is the driving performance of the screening barrel strictly required, but the box has to be opened and cleaned frequently. The screening and slag removal efficiency is low, affecting the normal operation of the shield. The representative patent is "CN201821615058.7".

[0009] Therefore, how to propose a slag screening device that can quickly screen slag and avoid problems such as traditional grille clogging and low slag cleaning efficiency is a topic that technical personnel in this field need to focus on. Utility Model Content

[0010] In view of the deficiencies in the prior art, the utility model proposes a slag screening system and a shield machine comprising the system, aiming to solve the problems of easy clogging of the screening barrel and low slag cleaning efficiency in the prior art.

[0011] The utility model provides a slag and stone screening system, which comprises a quarrying box and a screening assembly and a driving assembly arranged in the quarrying box;

[0012] The fixed end of the driving assembly is fixedly connected to the quarrying box, and the driving end of the driving assembly is connected to the screening assembly;

[0013] The quarrying box comprises a lower box assembly and an upper box assembly which are connected to each other, and the screening assembly is arranged between the lower box assembly and the upper box assembly;

[0014] The lower box assembly includes a lower frame and a support plate arranged in the cavity of the lower frame. The cavity of the lower frame is divided into a slurry cavity and a slag storage cavity by the support plate. A grid plate for screening slag and stone is also provided in the slag storage cavity.

[0015] Optionally, the grid plate is arranged at an angle, and the slag storage chamber is divided into an upper cavity and a lower cavity by the grid plate.

[0016] Optionally, a through opening communicating with each other is provided between the lower cavity and the slurry cavity.

[0017] Optionally, a main slurry discharge pipe for rapid slurry discharge is further provided on the lower frame, and the main slurry discharge pipe is communicated with the lower cavity in the slag storage cavity.

[0018] Optionally, a main slag cleaning pipe is further provided on the lower frame, and the main slag cleaning pipe is communicated with the upper cavity in the slurry storage chamber and is used for clearing slag and stone in the lower frame.

[0019] Optionally, a lower inspection door is provided on the lower frame for facilitating inspection and cleaning of the slurry chamber, and the lower inspection door is movably mounted on the lower frame.

[0020] Optionally, the upper box assembly includes an upper frame, the upper frame includes an upper top plate and a first side panel, a second side panel, a third side panel and a fourth side panel, one end of each of which is connected to the upper top plate, the first side panel and the second side panel are symmetrically arranged along the length direction center axis of the upper frame, the third side panel is arranged at an angle less than 90 degrees to the width direction center axis of the upper frame, and the fourth side panel is arranged parallel to the width direction center axis of the upper frame.

[0021] Optionally, an upper mounting seat is provided on the lower end surface of the upper frame, and the upper mounting seat is cooperatively connected with a lower mounting seat provided on the lower frame;

[0022] A buffer plate is further provided between the third side plate and the upper mounting seat. The buffer plate is detachably connected to the third side plate and the upper mounting plate, and an angle between the buffer plate and the upper mounting plate is greater than 90 degrees and less than 180 degrees.

[0023] Optionally, an upper inspection door for inspecting and cleaning the upper part of the quarrying box is provided on the fourth side panel;

[0024] An observation port and a pressure relief assembly are also provided on the first side panel. The pressure relief assembly includes a pressure gauge and a pressure relief valve group. The observation port is used for the operator to view the situation inside the quarrying box; the pressure relief assembly is used to unload the pressure inside the quarrying box.

[0025] Optionally, the screening assembly includes a transmission main shaft, a transmission slave shaft, a driving gear, a driven gear, a transmission chain and a transmission roller assembly;

[0026] The transmission main shaft is fixedly connected to the driving assembly, and the transmission main shaft and the transmission slave shaft are rotatably connected by respective clamping structures;

[0027] The driving gear comprises a plurality of pieces spaced apart from each other on the transmission main shaft, and the driven gear comprises a plurality of pieces spaced apart from each other on the transmission slave shaft. A single driving gear and a single driven gear are connected to each other via a transmission chain, thereby forming a sprocket transmission structure.

[0028] A plurality of transmission roller assemblies spaced apart from each other are provided between two adjacent transmission chains, and the spacing between the two adjacent transmission roller assemblies is adjusted.

[0029] Optionally, the screening assembly further includes a tensioning assembly for adjusting the tension of the transmission chain.

[0030] Optionally, an independent storage box may be detachably connected to the main slag cleaning pipe, and the independent storage box is used to collect and store slag and rocks discharged through the main slag cleaning pipe.

[0031] The utility model also provides a shield machine, comprising a shield main machine, a slag transport unit and the slag and rock screening system as described above;

[0032] The slag screening system is detachably connected to the slag discharge port at the tail of the screw machine in the shield main machine, and the slag screening system is fixedly connected to the trolley in the shield main machine for screening and storing slag;

[0033] The slag transport unit is connected to the sheet feeder in the shield main machine, and the slag transport unit includes a slag discharge pipe detachably connected to the slag screening system for discharging the slag.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The slag and rock screening system involved in the utility model adopts a screening component to perform primary screening on the slag and rock, and then performs secondary screening on the slag and rock after the primary screening through the grid plate in the quarrying box; by setting up a multi-stage screening structure, it can achieve rapid filtering and screening of large-particle slag and rock in the mud, avoiding the risk of pump blockage.

[0036] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the overall structure of a shield machine in one embodiment of the present utility model;

[0039] Figure 2 yes Figure 1 Schematic diagram of the middle AA section;

[0040] Figure 3 yes Figure 1 Schematic diagram of the structure of the medium slag stone screening system (for clarity, the upper box is removed halfway);

[0041] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle and lower box components;

[0042] Figure 5 yes Figure 3 Schematic diagram of the structure of the middle and upper box assembly;

[0043] Figure 6 yes Figure 3 Schematic diagram of the structure of the middle screening component;

[0044] Figure 7 yes Figure 1 Schematic diagram of the structure after the medium slag stone screening system and independent storage box are connected to each other.

[0045] in:

[0046] 1. Shield machine, 1.1. Screw machine, 1.2. Circulation unit, 1.3. Sheet feeder;

[0047] 2. Slag screening system, 2.1. Lower box assembly, 2.1.1. Lower frame, 2.1.2. Support plate, 2.1.3. Grid plate, 2.1.4. Main slurry discharge pipe, 2.1.5. Main slag cleaning pipe, 2.1.6. Flushing pipe, 2.1.7. Slurry collection pipe, 2.1.8. Lower bearing seat, 2.1.9. Drive seat, 2.1.10. Lower inspection door, 2.1.11. Lower mounting seat, 2.1.12. Independent storage box, 2.2. Upper box assembly, 2.2.1, upper frame, 2.2.2, pulp inlet, 2.2.3, connecting seat, 2.2.4, upper mounting seat, 2.2.5, upper bearing seat, 2.2.6, upper inspection door, 2.2.7, observation port, 2.2.8, pressure relief assembly, 2.3, screening assembly, 2.3.1, transmission main shaft, 2.3.2, transmission slave shaft, 2.3.3, driving gear, 2.3.4, driven gear, 2.3.5, transmission chain, 2.3.6, transmission roller assembly;

[0048] 3. Slag transport unit. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present invention more clear and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all simplified and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the implementation of the present invention; the "several" mentioned in the present invention are not limited to the specific quantities in the examples in the drawings; the directions or positional relationships indicated by "front", "middle", "back", "left", "right", "up", "down", "top", "bottom", "middle", etc. mentioned in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor can they be understood as limitations on the present invention.

[0050] Example:

[0051] See also Figure 1 and Figure 2 As shown, the present invention provides a shield machine, which includes a shield main machine 1 and a slag screening system 2 and a slag transport unit 3 connected to the shield main machine 1.

[0052] The shield main machine 1 includes a shield body, a screw machine 1.1, a tail gate, a circulation unit 1.2 and a sheet feeder 1.3; the shield main machine is arranged in the tunnel, the front end of the screw machine 1.1 is connected to the excavation chamber in the shield main machine 1, and the rear end of the screw machine 1.1 is provided with a slag discharge port, the end of the slag discharge port is connected to one end of the tail gate, and the other end of the tail gate is bolted with a soft connection structure, and the soft connection structure is connected to the slag screening system 2; the circulation unit 1.2 is arranged on the shield main machine, and the circulation unit 1.2 includes a slurry feeding mechanism and a slurry discharge mechanism, the front end of the slurry feeding mechanism is connected to the excavation chamber, the rear end of the slurry feeding mechanism is connected to the slurry feeding pump, the slurry discharge mechanism is connected to the main slurry discharge pump and is provided with a main discharge valve, and the slurry is discharged to the outside of the tunnel by driving the main slurry discharge pump and controlling the main discharge valve; the sheet feeder 1.3 is arranged at the lower part of the shield main machine, and the feeder moves forward with the shield main machine for storage and transportation of pipe segments.

[0053] The slag screening system 2 is detachably connected to the slag discharge port at the tail of the screw machine 1.1, and the slag screening system 2 is fixedly connected to the trolley in the shield main machine 1 for screening and storing large-size slag.

[0054] The slag transport unit 3 is connected to the sheet feeder 1.3, and includes a slag discharge pipe detachably connected to the slag screening system for discharging large-size slag. Specifically, the specific structure of the slag transport unit 3 refers to the prior art.

[0055] In addition to the above structure, the slag transport unit 3 can also be set at the bottom of the tunnel according to demand.

[0056] Furthermore, the slag transport unit 3 is slidably connected to the upper track of the sheet feeder 1.3, and the slag transport unit 3 includes a slag transport trolley and a main slag discharge pipe and an auxiliary slag discharge pipe arranged on the slag transport trolley. The main slag discharge pipe is detachably connected to the main slag cleaning valve (connected when in use), and the slag in the slag storage chamber is discharged into the transport unit (trolley); the auxiliary slag discharge pipe can be detachably connected to the auxiliary slag cleaning valve (connected when in use), and the slag in the slurry chamber is discharged into the transport unit (trolley); the slag transport unit 3 can quickly clean the slurry and slag in the quarrying box and transport them outside the tunnel.

[0057] See also Figures 3 to 6 As shown, the slag screening system 2 includes a quarrying box and a screening assembly 2.3 and a driving assembly arranged in the quarrying box; the fixed end of the driving assembly is fixedly connected to the quarrying box, and the driving end of the driving assembly is connected to the screening assembly 2.3.

[0058] Preferably, the quarrying box comprises a lower box assembly 2.1 and an upper box assembly 2.2 connected to each other;

[0059] The lower box assembly 2.1 includes a lower frame 2.1.1, which is configured as a sealed frame structure with only the upper end face open. A support plate 2.1.2 is fixedly installed in the cavity of the lower frame 2.1.1. The cavity of the lower frame 2.1.1 is divided into a slurry cavity and a slag storage cavity by the support plate 2.1.2.

[0060] Further preferably, at least one through opening for connecting the slurry chamber and the slag storage chamber is provided on the support plate 2.1.2, so that the primary screening slurry can pass through.

[0061] Further preferably, an inclined grid plate 2.1.3 is provided in the slag storage chamber; specifically, one end of the grid plate 2.1.3 is fixedly connected to the upper part of the inner wall of the slag storage chamber, and the other end of the grid plate 2.1.3 is fixedly connected to the inner bottom end surface of the slag storage chamber, so that the slag storage chamber is divided into an upper cavity and a lower cavity by the grid plate 2.1.3.

[0062] Further preferably, a main drain pipe 2.1.4 for rapid slurry discharge is provided on the lower frame 2.1.1. This main drain pipe 2.1.4 is interconnected with the lower chamber of the slag storage chamber and is load-matched to the main drain pump in the circulation unit 1.2. Even more preferably, a main drain valve is provided on this main drain pipe 2.1.4 to facilitate rapid control of the connection or disconnection of this main drain pipe 2.1.4. Specifically, this main drain valve is preferably a hydraulic knife gate valve.

[0063] Further preferably, a main slag cleaning pipe 2.1.5 is provided on the lower frame 2.1.1, and the main slag cleaning pipe 2.1.5 is interconnected with the upper cavity in the slurry storage chamber, and is used to discharge the slag after the secondary screening by the grid plate 2.1.3. Further preferably, a main slag cleaning valve is provided on the main slag cleaning pipe 2.1.5, and the main slag cleaning valve is used to quickly control the connection or disconnection of the main slag cleaning pipe 2.1.5; specifically, the main slag cleaning valve is preferably configured as a hydraulic valve. Further preferably, see Figure 7 As shown, an independent storage box 2.1.12 is detachably connected to the main slag cleaning pipe 2.1.5. The independent storage box 2.1.12 is used to collect and store the slag discharged through the main slag cleaning pipe 2.1.5. When the space in the independent storage box 2.1.12 is full, the slag can be cleaned separately by removing the independent storage box 2.1.12 without interrupting the circulation unit. The frequency of slag cleaning can be greatly reduced, so that the shield machine can operate more efficiently.

[0064] Specifically, the independent storage box 2.1.12 includes a storage frame, a box door, an observation window, a pressure relief module, and a slag discharge valve;

[0065] The storage rack is designed as a box structure, and a slag drop port is provided on one side thereof (left and right, close to the quarrying box side), and the slag drop port is inclined, and its angle matches the main slag cleaning port, and is bolted and fixedly connected to the main slag cleaning valve;

[0066] The bottom of the storage rack is provided with a slag discharge port, the end of which is fixedly connected to the slag discharge valve;

[0067] A box door is provided on one side of the storage rack (in the front-to-back direction, away from the excavation direction) to facilitate inspection and cleaning of the slag storage box;

[0068] An observation window is also provided on one side of the storage rack (on the same side as the box door) to observe the condition inside the box in real time;

[0069] A pressure relief module is provided on the other side of the storage rack (in the left and right directions, away from the quarrying box side), which can unload the pressure in the storage box to a normal pressure state;

[0070] As described above, when it is observed that the slag storage volume in the storage box reaches the set volume Q2, the main slag cleaning valve needs to be closed, the pressure relief module needs to be opened to release the pressure to normal pressure, the slag transport unit (slag pouring pipe) is bolted and connected to the slag discharge valve and the slag discharge valve is opened to clean and transport the slag to the outside of the tunnel.

[0071] Further preferably, a flushing pipe 2.1.6 is provided on the lower frame 2.1.1. One end of the flushing pipe 2.1.6 is connected to the auxiliary slurry discharge pipeline in the shield main unit 1. The flushing pipe 2.1.6 is interconnected with the slurry chamber, and is used to flush and discharge the residual slurry in the slurry chamber. This can also achieve rapid auxiliary slurry discharge when the shield machine is excavating soft strata (such as those without gravel, sand, or soil). Further preferably, a flushing valve is provided on the flushing pipe 2.1.6 to facilitate rapid control of the connection and disconnection of the flushing pipe 2.1.6. Specifically, the flushing valve is preferably configured as a hydraulic knife gate valve.

[0072] Further preferably, a slurry pipe 2.1.7 is provided on the lower frame 2.1.1. One end of the slurry pipe 2.1.7 is connected to the slurry chamber, and the other end is connected to a flushing pump in the circulation system, which is used to draw slurry from the slurry chamber to assist in flushing the cutterhead or excavation chamber at the front of the shield machine. Further preferably, a slurry valve is provided on the slurry pipe 2.1.7 to facilitate rapid control of the connection or disconnection of the slurry pipe 2.1.7. Specifically, the slurry valve is preferably configured as a manual knife gate valve.

[0073] Further preferably, a lower bearing seat 2.1.8 for connecting to the screening assembly 2.3 and a drive seat 2.1.9 for connecting to the drive assembly are also provided on the lower frame 2.1.1, and the lower bearing seat 2.1.8 and the drive seat 2.1.9 are both arranged on one side of the slurry chamber. Specifically, the lower bearing seat 2.1.8 is provided with two groups arranged on the upper end surface of the lower frame 2.1.1 in a bilaterally symmetrical manner, and the spacing between the two groups of lower bearing seats 2.1.8 is slightly smaller than the front-to-back length of the slurry chamber. Further preferably, the lower bearing seats 2.1.8 are all semicircular in shape, and the openings are facing upward (their upper end surfaces are flush with the upper end surfaces of the lower mounting seats) to facilitate bearing installation and sealing; the drive seats 2.1.9 are divided into two groups and are correspondingly arranged on the other side of the lower frame 2.1.1 (in this case, they are arranged on the same side as the slurry outlet) to facilitate installation of the drive assembly.

[0074] Further preferably, a lower inspection door 2.1.10 is provided on the lower frame 2.1.1 for facilitating inspection and cleaning of the slurry chamber, and the lower inspection door 2.1.10 is movably mounted on the lower frame 2.1.1.

[0075] Further preferably, a secondary slag-cleaning pipe is provided on the lower frame 2.1.1. The secondary slag-cleaning pipe is interconnected with the slag slurry chamber and is disposed at the bottom of the slag slurry chamber. The other end of the secondary slag-cleaning pipe is connected to the secondary slag-discharging pipe in the slag transport unit 3, and is used to discharge the slag slurry, sludge, or small-sized slag and stone in the slag slurry chamber into the slag transport unit 3. Further preferably, a secondary slag-cleaning valve is provided on the secondary slag-cleaning pipe to facilitate rapid connection and disconnection of the secondary slag-cleaning pipe; specifically, the secondary slag-cleaning valve is preferably configured as a hydraulic knife gate valve.

[0076] Further preferably, the lower frame 2.1.1 is detachably connected to a main slag dumping pipe 3.1 in the slag transport unit 3, and the main slag dumping pipe 3.1 is used to dump the large-particle slag sieved by the grid plate 2.1.3 into the slag transport unit 3.

[0077] The upper box assembly 2.2 includes an upper frame 2.2.1, and the upper frame 2.2.1 includes an upper top plate and a first side plate, a second side plate, a third side plate and a fourth side plate, one end of which is connected to the upper top plate. The first side plate and the second side plate are symmetrically arranged along the longitudinal center axis of the upper frame 2.2.1, the third side plate is arranged at an angle less than 90 degrees to the width center axis of the upper frame 2.2.1, and the fourth side plate is arranged parallel to the width center axis of the upper frame 2.2.1. Further preferably, an upper mounting seat 2.2.4 is provided on the lower end face of the upper frame 2.2.1, and the upper mounting seat 2.2.4 is cooperated and connected with the lower mounting seat 2.1.11 provided on the lower frame 2.1.1; a buffer plate is also provided between the third side plate and the upper mounting seat 2.2.4, and the buffer plate is detachably connected to the third side plate and the upper mounting plate, and the angle between the buffer plate and the upper mounting plate is greater than 90 degrees and less than 180 degrees, which is used to buffer and divert large-particle slag to prevent large-particle slag from directly impacting and damaging the screening component 2.3.

[0078] Further preferably, a slurry inlet 2.2.2 is provided on the third side panel and a connecting seat 2.2.3 is provided on the periphery of the slurry inlet 2.2.2. The connecting seat 2.2.3 is bolted to the soft connection connected to the rear gate of the screw machine 1.1, so that the slurry inlet 2.2.2 is correspondingly arranged and detachably connected to the slag outlet at the tail of the screw machine 1.1.

[0079] Further preferably, an upper bearing seat 2.2.5 for connecting to the screening assembly 2.3 is also provided on the upper mounting seat 2.2.4, and the upper bearing seat 2.2.5 and the lower bearing seat 2.1.8 are arranged in a one-to-one correspondence; and the upper bearing seat 2.2.5 is also arranged as a semicircular structure with the opening facing downward, and the upper bearing seat 2.2.5 and the lower bearing seat 2.1.8 cooperate with each other to form a clamping structure for clamping and sealing the screening assembly 2.3.

[0080] Further preferably, an upper inspection door 2.2.6 for inspecting and cleaning the upper part of the quarrying box is further provided on the fourth side panel.

[0081] Further preferably, an observation port 2.2.7 and a pressure relief assembly 2.2.8 are provided on the first side panel. The pressure relief assembly 2.2.8 includes a pressure gauge and a pressure relief valve assembly. The observation port 2.2.7 allows an operator to view the conditions inside the quarrying box. The pressure relief assembly 2.2.8 is used to relieve pressure inside the quarrying box. Specifically, when the quarrying box needs to be inspected or cleaned, the pressure must be relieved by means of the pressure relief assembly 2.2.8. Only after the pressure reaches the set value, i.e., normal pressure, can subsequent operations be carried out.

[0082] The screening assembly 2.3 is configured as a sprocket transmission structure; specifically, the screening assembly 2.3 includes a transmission main shaft 2.3.1, a transmission slave shaft 2.3.2, a driving gear 2.3.3, a driven gear 2.3.4, a transmission chain 2.3.5 and a transmission roller assembly 2.3.6; the transmission main shaft 2.3.1 is fixedly connected to the drive assembly, and the transmission main shaft 2.3.1 and the transmission slave shaft 2.3.2 are rotatably connected by a clamping structure; the driving gear 2.3.3 is provided with a plurality of mutually spaced gears on the transmission main shaft 2.3.1. The driven gear 2.3.4 comprises a plurality of spaced-apart driven gears 2.3.3 and 2.3.4, which are arranged on the transmission shaft 2.3.2. A single driving gear 2.3.3 and a single driven gear 2.3.4 are connected to each other via a transmission chain 2.3.5, thereby forming a sprocket transmission structure. A plurality of spaced-apart transmission roller assemblies 2.3.6 are provided between two adjacent transmission chains 2.3.5. The spacing between two adjacent transmission roller assemblies 2.3.6 can be adjusted to adjust the screening spacing, thereby controlling the screening of slag stones of different sizes.

[0083] Further preferably, the spacing between two adjacent driving gears 2.3.3 is preferably set to be greater than or equal to 2 times the pitch of the transmission chain 2.3.5.

[0084] Further preferably, the screening assembly 2.3 further comprises a tensioning assembly for adjusting the tension of the transmission chain 2.3.5. Specifically, the arrangement of the tensioning assembly may refer to the prior art.

[0085] The drive component is preferably configured as an electric motor.

[0086] As a further embodiment of the present invention, the specific process of using the above-mentioned shield machine to screen the slag during the shield tunneling process is as follows:

[0087] 1. Slag screening

[0088] S1.1. Based on detailed geological survey data, the shield machine will rotate and start the slag screening system. When the shield machine is about to advance into a rock-soil composite stratum containing large-sized pebbles, boulders, etc., the screw machine will operate normally, and the slag screening system must be started in advance to screen the slag.

[0089] S1.2. The shield machine control system controls the drive assembly to start (the number of groups to be started depends on the working conditions. In this case, one group is started as an example). The drive assembly drives the screening assembly to start operation.

[0090] S1.3. At this time, the slag in the excavation bin is discharged into the quarry through the screw conveyor. After primary screening by the screening component, most of the small-sized slag and mud are filtered out and fall into the slurry cavity. The remaining slurry, sand and gravel are transported to the grid plate by the short rollers on the screening unit.

[0091] S1.4. The slurry, sand and gravel that reach the grid plate are screened and filtered through the upper diameter holes of the grid plate for the second time and fall into the bottom of the slag storage chamber, leaving only large-sized slag and gravel temporarily in the upper part of the slag storage chamber;

[0092] S1.5. The slurry (mud, small-sized sand and gravel, etc.) filtered in the slurry chamber first flows through the through port to the bottom of the slurry storage chamber, and is discharged from the main slurry discharge port together with the slurry that has been screened twice at the bottom of the slurry storage chamber, and finally transported to a designated location outside the tunnel;

[0093] 2. Slag Cleaning

[0094] S2.1. When the volume of slag in the slag storage chamber reaches the set value, the shield machine needs to be stopped to clean the quarrying box, and the upper segments of the feeder need to be assembled in advance to reserve a channel for the slag transport unit. At this time, the main discharge valve, main slag cleaning valve, flushing valve, slurry valve, and auxiliary slag cleaning valve need to be closed;

[0095] S2.2. Turn off the drive assembly, stop the quarrying box, and open the pressure relief assembly to relieve the pressure in the quarrying box until the pressure inside the quarrying box reaches the set value (normal pressure). Then check the sealing condition of each valve group to ensure that it is sealed and leak-free.

[0096] S2.3. Transport the slag transport unit (via the transport equipment on the shield machine) to the sheet feeder and move it to the set position below the quarrying box. Simultaneously, connect the main slag discharge pipe and the auxiliary slag discharge pipe to the main slag cleaning valve and the auxiliary slag cleaning valve respectively. Then open the main slag cleaning valve and the auxiliary slag cleaning valve to discharge the slag in the quarrying box into the transport unit.

[0097] S2.4. After the cleaning is completed, close the main and auxiliary slag cleaning valves, remove the main and auxiliary slag dumping pipes, return the dumping unit to the hoisting area and be transported to the set position, and then transport the slag out of the tunnel, completing the slag cleaning and transportation;

[0098] S2.5. Open the corresponding valve groups, drive components, etc., the quarrying box operates normally, the shield machine excavates normally, and enters the next cycle operation.

[0099] Furthermore, before step S2.2, a flushing pipeline may be connected to the flushing valve to perform high-pressure flushing and cleaning of the quarrying box according to the bottom condition of the quarrying box to avoid slag accumulation at the bottom of the box;

[0100] Furthermore, for the slag cleaning, the inspection door can be opened according to the actual working conditions to clean the bottom of the quarrying box, the grid plate, etc., and to inspect the interior of the quarrying box (such as the screening unit, etc.);

[0101] Furthermore, this case uses a slag dump pipe to transport slag and a slag transport unit (such as a dump truck) to transport the slag out of the tunnel, which can achieve green and efficient slag removal.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A slag screening system, characterized in that: The slag and stone screening system (2) comprises a quarrying box, a screening assembly (2.3) and a driving assembly arranged in the quarrying box; The fixed end of the driving assembly is fixedly connected to the quarrying box, and the driving end of the driving assembly is connected to the screening assembly (2.3); The quarrying box comprises a lower box assembly (2.1) and an upper box assembly (2.2) which are connected to each other, and the screening assembly (2.3) is arranged between the lower box assembly (2.1) and the upper box assembly (2.2); The lower box assembly (2.1) comprises a lower frame (2.1.1) and a support plate ( 2.1.2), the cavity of the lower frame (2.1.1) is divided into a slurry cavity and a slag storage cavity by a support plate (2.1.2), and a grid plate (2.1.3) for screening slag and stone is also provided in the slag storage cavity.

2. The slag screening system according to claim 1, characterized in that: The grid plate (2.1.3) is arranged to be inclined, and the slag storage cavity is divided into an upper cavity and a lower cavity by the grid plate (2.1.3); A through port communicating with each other is provided between the lower cavity and the slurry cavity.

3. The slag and rock screening system according to claim 2, characterized in that: A main slurry discharge pipe (2.1.4) for rapid slurry discharge is also provided on the lower frame (2.1.1), and the main slurry discharge pipe (2.1.4) is communicated with the lower cavity in the slag storage cavity; A main slag cleaning pipe (2.1.5) is also provided on the lower frame (2.1.1). The main slag cleaning pipe (2.1.5) is communicated with the upper cavity in the slurry storage cavity and is used to remove slag and stone in the lower frame (2.1.1); A lower inspection door (2.1.10) is also provided on the lower frame (2.1.1) for facilitating inspection and cleaning of the slurry cavity. The lower inspection door (2.1.10) is movably mounted on the lower frame (2.1.1).

4. The slag and rock screening system according to any one of claims 1 to 3, characterized in that: The upper box assembly (2.2) includes an upper frame (2.2.1), and the upper frame (2.2.1) includes an upper top plate and a first side plate, a second side plate, a third side plate and a fourth side plate, one end of each of which is connected to the upper top plate. The first side plate and the second side plate are symmetrically arranged along the longitudinal center axis of the upper frame (2.2.1), the third side plate is arranged at an angle less than 90 degrees to the width center axis of the upper frame (2.2.1), and the fourth side plate is arranged parallel to the width center axis of the upper frame (2.2.1).

5. The slag and rock screening system according to claim 4, characterized in that: An upper mounting seat (2.2.4) is provided on the lower end surface of the upper frame (2.2.1), and the upper mounting seat (2.2.4) is connected to a lower mounting seat (2.1.11) provided on the lower frame (2.1.1) in a cooperative manner. A buffer plate is provided between the third side plate and the upper mounting seat (2.2.4). The buffer plate is detachably connected to the third side plate and the upper mounting plate, and an angle between the buffer plate and the upper mounting plate is greater than 90 degrees and less than 180 degrees.

6. The slag and rock screening system according to claim 5, characterized in that: An upper inspection door (2.2.6) for inspecting and cleaning the upper part of the quarrying box is also provided on the fourth side panel; An observation port (2.2.7) and a pressure relief assembly (2.2.8) are also provided on the first side panel. The pressure relief assembly (2.2.8) includes a pressure gauge and a pressure relief valve group. The observation port (2.2.7) is used for an operator to view the situation inside the quarrying box; the pressure relief assembly (2.2.8) is used to unload the pressure inside the quarrying box.

7. The slag and rock screening system according to claim 5 or 6, characterized in that: The screening assembly (2.3) includes a transmission main shaft (2.3.1), a transmission slave shaft (2.3.2), a driving gear (2.3.3), a driven gear (2.3.4), a transmission chain (2.3.5) and a transmission roller assembly (2.3.6); The transmission main shaft (2.3.1) is fixedly connected to the drive assembly, and the transmission main shaft (2.3.1) and the transmission slave shaft (2.3.2) are rotatably connected by respective clamping structures; The driving gear (2.3.3) is provided with a plurality of pieces spaced apart from each other on the transmission main shaft (2.3.1); the driven gear (2.3.4) is provided with a plurality of pieces spaced apart from each other on the transmission slave shaft (2.3.2); a single driving gear (2.3.3) and a single driven gear (2.3.4) are connected to each other via a transmission chain (2.3.5), thereby forming a sprocket transmission structure; A plurality of transmission roller assemblies (2.3.6) spaced apart from each other are provided between two adjacent transmission chains (2.3.5), and the spacing between the two adjacent transmission roller assemblies (2.3.6) is adjusted.

8. The slag and rock screening system according to claim 7, characterized in that: The screening assembly (2.3) also includes a tensioning assembly for adjusting the tension of the transmission chain (2.3.5).

9. The slag and rock screening system according to claim 8, characterized in that: An independent storage box (2.1.12) is detachably connected to the main slag cleaning pipe (2.1.5), and the independent storage box (2.1.12) is used to collect and store slag discharged through the main slag cleaning pipe (2.1.5).

10. A shield machine, characterized in that: It comprises a shield machine (1), a slag transport unit (3), and the slag screening system (2) according to claim 9; The slag screening system (2) is detachably connected to the slag discharge port at the tail of the screw machine (1.1) in the shield main machine (1), and the slag screening system (2) and the trolley in the shield main machine (1) are fixedly connected to each other for screening and storing slag; The slag transport unit (3) is connected to the sheet feeder (1.3) in the shield main machine (1), and the slag transport unit (3) includes a slag discharge pipe detachably connected to the slag screening system, which is used for discharging slag.

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