Tunnel construction site silt cleaning device

Abstract

The present invention discloses a silt cleaning device for a tunnel construction site, belonging to the technical field of tunnel construction. The device includes a frame and a silt hopper fixedly installed on the frame; both the upper and lower ends of the silt hopper are open. The bottom opening of the silt hopper is the silt inlet. Two bin doors are connected to the two side walls of the silt hopper, and the two bin doors are closed when they move downward along an arc trajectory to the middle position of the silt inlet; a door driving assembly for controlling the opening or closing of the bin doors is arranged on the silt hopper; grid plates in a fork-comb cooperation are connected to the two side walls of the silt hopper. The grid plates are used to screen out impurities in the silt hopper from the silt when they rotate upward with their top ends as the center to a state where the bottom ends are upwardly inclined and separated; a plate driving assembly for providing power to the grid plates is arranged on the frame. The present invention adopts the cooperation of the grid plates and the bin doors, which can realize the synchronous screening out of impurities such as gravel in the silt and ensure the effective closing of the bin doors, improving the silt cleaning efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and more specifically, relates to a silt cleaning device for tunnel construction sites. Background Art

[0002] Silt cleaning at tunnel construction sites is one of the important projects in tunnel construction, which is related to the drainage function, traffic safety, and long-term stability of the tunnel.

[0003] Currently, there are mainly two methods for silt cleaning at tunnel construction sites: mechanical silt cleaning and hydraulic silt cleaning. Mechanical silt cleaning is suitable for situations where the silt is thick and the area is large, mainly using a sewage suction truck to suck out the dirt in the pipeline. Hydraulic silt cleaning is suitable for situations where the silt is thin and easy to wash away, using high-pressure water flow to wash the silt and then discharging the mud out of the tunnel through the drainage system.

[0004] However, in the actual construction process, the silt often contains debris such as crushed stones generated at the construction site. No matter which of the above mechanical methods is used, it is very difficult to effectively separate the silt from the debris such as crushed stones, causing difficulties in subsequent treatment processes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a silt cleaning device for tunnel construction sites that can screen out impurities such as crushed stones in the silt.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a silt cleaning device for tunnel construction sites, including a frame and a silt hopper fixedly installed on the frame;

[0007] Both the upper and lower ends of the silt hopper are open. The open bottom end of the silt hopper is the silt inlet. Two hatch doors are connected to the two side walls of the silt hopper, and the two hatch doors close when they move downward along an arc trajectory to the middle position of the silt inlet; a door driving assembly for controlling the opening or closing of the hatch doors is provided on the silt hopper.

[0008] Grating plates that are in a fork-comb cooperation are connected to the two side walls of the silt hopper. When the grating plates rotate upward with their top ends as the center until the bottom ends are tilted upward and separated, the impurities in the silt hopper are screened out from the silt; a plate driving assembly for providing power to the grating plates is provided on the frame.

[0009] Further, the door driving assembly includes a door driving oil cylinder, door driving connecting rods, and a door driving cross arm; the door driving oil cylinder is installed on the silt hopper, the extending end of the door driving oil cylinder is rotatably connected to two door driving connecting rods, the bottom ends of the door driving connecting rods are rotatably connected to the door driving cross arm, and the end of the door driving cross arm away from the door driving connecting rods is fixedly connected to the hatch door.

[0010] Further, a support shaft is provided at the top of the grille plate. A rotating plate is fixedly connected to the end of the support shaft. The grille plate rotates around the support shaft. A connecting shaft is provided at the top of the rotating plate. The connecting shaft is connected to the plate driving assembly. Channel grooves are formed on both sides of the sludge hopper. When the grille plate rotates, the connecting shaft displaces within the channel grooves.

[0011] Further, longitudinal chutes are formed on both sides of the sludge hopper. The top slot opening of the channel groove communicates with the outer side wall of the chute. When the connecting shaft is at the top of the chute, the grille plate is in a state of being received inside the sludge hopper. When the support shaft is at the bottom of the chute, the connecting shaft is at the connection of the channel groove and the chute, and the bottom end of the grille plate is located below the side wall of the sludge hopper.

[0012] Further, when the grille plate is in a vertical state, the part of the grille plate below the support shaft closely adheres to the inner wall surface of the sludge hopper.

[0013] Further, the distance between the bottom end of the grille plate and the center of the support shaft is adapted to the cavity width of the sludge hopper. An inner retraction groove extends outward from the bottom end of the chute, and the length of the inner retraction groove is greater than the outer diameter of the support shaft.

[0014] Further, the plate driving assembly includes a plate driving oil cylinder, a plate driving connecting rod, and a plate driving cross arm. The plate driving oil cylinder is installed on the frame. The plate driving connecting rod is in a "door" shape structure. The top end of the plate driving connecting rod is fixedly connected to the extending end of the plate driving oil cylinder. A shaft is provided at the bottom of the plate driving connecting rod, and the inner ends of two plate driving cross arms are rotationally connected through the shaft. The outer ends of the plate driving cross arms are rotationally connected to the connecting shaft.

[0015] Further, side plates are provided at both ends of the side walls of the sludge hopper. The channel grooves are formed on the side plates. A hoarding area is formed between the side plates, the bin door, and the side surface of the sludge hopper.

[0016] When the bin door is in an open state, an impurity inlet is formed between the top of the side wall of the sludge hopper for impurities on the grille plate to slide into the hoarding area. When the bin door makes a circular motion upward in an open state, an impurity outlet is formed between the bottom of the bin door and the bottom of the side wall of the sludge hopper for the impurities in the hoarding area to break away.

[0017] A sludge cleaning device provided by the present invention uses a grille plate and a bin door in cooperation, can synchronously screen out impurities such as gravel in the sludge, ensure the effective closing of the bin door, and improve the sludge cleaning efficiency.

[0018] In addition, the device of the present invention is small in volume, flexible in operation, occupies little construction space in the tunnel, and will not affect other construction operations in the tunnel. Description of the Drawings

[0019] The accompanying drawings herein are used to provide further illustration of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention.

[0020] Figure 1 It is a schematic diagram of the dredging device at the construction site of the tunnel when the bin door is opened to the maximum state and impurities are discharged externally;

[0021] Figure 2 is Figure 1 the enlarged view of part A in

[0022] Figure 3 It is a schematic diagram of the structure of the silt hopper;

[0023] Figure 4 It is a schematic diagram when the bin door is opened to the maximum state and the grille plate rotates to the limit position;

[0024] Figure 5 It is a schematic diagram when the bin door is in the normal open state and the grille plate is in the initial state;

[0025] Figure 6 It is a schematic diagram when the grille plate is inserted downward into the silt;

[0026] Figure 7 It is a schematic diagram when the bin door is in the normal open state and the grille plate rotates to the limit position.

[0027] In the figure, 1 - frame; 2 - silt hopper; 3 - silt inlet; 4 - bin door; 4.1 - straight plate body; 4.2 - arc plate body; 5 - door drive assembly; 5.1 - door drive oil cylinder; 5.2 - door drive connecting rod; 5.3 - door drive cross arm; 6 - grille plate; 7 - plate drive assembly; 7.1 - plate drive oil cylinder; 7.2 - plate drive connecting rod; 7.3 - plate drive cross arm; 8 - support shaft; 9 - rotating plate; 10 - connecting shaft; 11 - channel groove; 12 - chute; 13 - inner retracting groove; 14 - side plate; 15 - accumulation area; 16 - impurity inlet; 17 - impurity outlet. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention will be further clearly and completely described below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, without conflict, the implementation manners and features in the embodiments in this application can be combined with each other.

[0029] Refer to Figures 1 to 7, A typical embodiment of the present invention provides a silt cleaning device for a tunnel construction site, which includes a frame 1 and a silt hopper 2 fixedly installed on the frame 1. Both the upper and lower ends of the silt hopper 2 are open, and the bottom opening of the silt hopper 2 is a silt inlet 3. The inner cavity of the silt hopper 2 is rectangular, and there are bin doors 4 provided on both sides of the silt hopper 2. During operation, when the two bin doors 4 move downward along an arc trajectory to the middle position of the silt inlet 3, they close. A door driving assembly 5 is provided on the silt hopper 2 for controlling the opening or closing of the bin doors 4.

[0030] Grid plates 6 that are in a fork-comb cooperation are connected to both side walls of the silt hopper 2. When the grid plates 6 rotate upward around their top ends to a state where their bottom ends are tilted upward and separated, impurities in the silt hopper 2 are screened out from the silt. In addition, when the grid plates 6 rotate to a state where their bottom ends are tilted upward, the screened-out impurities can be separated from both sides at the top of the silt hopper 2. A plate driving assembly 7 for providing power to the grid plates 6 is provided on the frame 1.

[0031] According to the silt cleaning device for a tunnel construction site provided by this embodiment, during operation, the device as a whole can be installed on the small arm of an excavator through the frame 1. The bin doors 4 are kept in an open state through the door driving assembly 5, so that the silt hopper 2 is inserted into the silt with the silt inlet 3 facing downward. Before closing the bin doors 4, the grid plates 6 are driven to act through the plate driving assembly 7. When the bottom ends of the grid plates 6 pass through the inner cavity of the silt hopper 2 from the bottom of the silt hopper 2, the gravel in the silt is screened out from the silt.

[0032] In this embodiment, the two grid plates 6 cooperate to lift the gravel near the silt inlet 3 away from the silt inlet 3 before the bin doors 4 are closed, so as to ensure that the bin doors 4 are closed more smoothly. In addition, during the discharging process of the silt hopper 2, the silt and gravel in the silt hopper 2 can be discharged separately through the grid plates 6, realizing the separate collection of silt and gravel during the silt cleaning process.

[0033] At the same time, the rotation direction of the grid plates 6 is from the bottom end upward, so that during the rotation of the grid plates 6 in the silt hopper 2, the grid plates 6 will not affect the accumulation of silt in the silt hopper 2, and can ensure that the silt hopper 2 can always accumulate a large amount of silt to ensure the silt cleaning efficiency of the silt hopper 2.

[0034] In a relatively specific embodiment, the door driving assembly 5 includes a door driving oil cylinder 5.1, door driving connecting rods 5.2, and a door driving cross arm 5.3. The door driving oil cylinder 5.1 is installed on the silt hopper 2. The extending end of the door driving oil cylinder 5.1 is rotatably connected to two door driving connecting rods 5.2. The bottom ends of the door driving connecting rods 5.2 are rotatably connected to the door driving cross arm 5.3. The end of the door driving cross arm 5.3 away from the door driving connecting rods 5.2 is fixedly connected to the bin door 4.

[0035] The above-mentioned door drive assembly 5 is provided one on each side of the sludge bucket 2. The two door drive cross arms 5.3 in each door drive assembly 5 are connected to the two bin doors 4 at the same time. The two sets of door drive cross arms 5.3 are cross-distributed on both sides of the sludge bucket 2. When the extended end of the door drive cylinder 5.1 extends downward, the door drive cross arm 5.3 is driven to rotate through the door drive connecting rod 5.2, and the door drive cross arm 5.3 drives the two bin doors 4 to make a circular motion downward, so that the bin doors 4 are closed.

[0036] After the bin door 4 is closed, the sludge in the sludge bucket 2 will not fall out of the sludge bucket 2 during the subsequent lifting process of the sludge bucket 2, thereby improving the sludge cleaning efficiency. When the extended end of the door driving cylinder 5.1 moves upward, the bin door 4 is opened through the door driving connecting rod 5.2 and the door driving cross arm 5.3.

[0037] In a relatively specific embodiment, a support shaft 8 is provided at the top of the grating plate 6, and a rotating plate 9 is fixedly connected to the end of the support shaft 8. The grating plate 6 rotates around the support shaft 8. A connecting shaft 10 is provided at the top of the rotating plate 9. The connecting shaft 10 is connected to the plate driving assembly 7, and channel grooves 11 are provided on both sides of the sludge bucket 2. When the grating plate 6 rotates, the connecting shaft 10 displaces in the channel groove 11.

[0038] The support shaft 8 serves as the rotation center and rotation fulcrum of the grille plate 6. The plate driving assembly 7 pushes the connecting shaft 10, so that the connecting shaft 10 drives the grille plate 6 to rotate through the rotating plate 9. During the rotation of the grille plate 6, the connecting shaft 10 moves in the channel groove 11. At the same time, the rotating plate 9 serves as the lever arm when the plate driving assembly 7 drives the grille plate 6 to rotate, thereby achieving the purpose of labor saving, improving the stability and efficiency of the rotation of the grille plate 6, and also helping to improve the efficiency of the grille plate 6 in lifting the gravel in the silt.

[0039] In this embodiment, when the grid plate 6 rotates to an inclined state with the inner end facing upward, the crushed stones on the grid plate 6 that are screened out by the grid plate 6 will fall downward along the inclined direction of the grid plate 6, so that the screened out crushed stones can smoothly escape from the sludge bucket 2 and the grid plate 6. In addition, through the arrangement of the grid plate 6, the stones on the grid plate 6 can be effectively limited and guided, which can prevent the crushed stones from deviating in the front-back direction and improve the discharge efficiency of the crushed stones.

[0040] In a preferred embodiment, longitudinal chutes 12 are provided on the front and rear sides of the sludge hopper 2. The top slot of the channel slot 11 communicates with the outer side wall of the chute 12. When the connecting shaft 10 is at the top of the chute 12, the grille plate 6 is in a state of being received inside the sludge hopper 2; when the support shaft 8 is at the bottom of the chute 12, the connecting shaft 10 is at the connection between the channel slot 11 and the chute 12, and the bottom end of the grille plate 6 is below the side wall of the sludge hopper 2. When the grille plate 6 rotates, the circumferential trajectory of its bottom end covers the circumferential trajectory of the bottom end of the hatch door 4 when the hatch door 4 is closed.

[0041] In this embodiment, during the process of inserting the sludge hopper 2 into the sludge, the grille plate 6 is in a state of being received inside the sludge hopper 2, so it will not affect the insertion of the sludge hopper 2 into the sludge. Before the hatch door 4 is closed, the grille plate 6 first moves downward inside the sludge hopper 2, and the bottom end of the grille plate 6 extends downward from the sludge inlet 3 to below the sludge hopper 2.

[0042] During the rotation of the grille plate 6, the bottom of the grille plate 6 will cross the arc trajectory of the bottom end of the hatch door 4 when the hatch door 4 is closed, so as to be able to clean the gravel blocking the closing trajectory of the hatch door 4 in advance, ensuring that the hatch door 4 can be closed more smoothly. In addition, by arranging the grille plate 6, when the hatch door 4 cannot be closed normally, through several repeated actions of the grille plate 6, it can assist the hatch door 4 to effectively clean the gravel on its closing trajectory, so as to more effectively ensure the normal closing of the hatch door 4.

[0043] In the initial state, the connecting shaft 10 is at the top of the chute 12. During the downward movement of the grille plate 6, both the connecting shaft 10 and the support shaft 8 slide downward in the chute 12. When the support shaft 8 moves to the bottom of the chute 12, the support shaft 8 supports the grille plate 6 and becomes the fulcrum for the rotation of the grille plate 6. Then, the connecting shaft 10 enters the channel slot 11 and displaces in the channel slot 11. At this time, the rotating plate 9 drives the grille plate 6 to rotate through the support shaft 8.

[0044] In a relatively specific embodiment, when the grille plate 6 is in a vertical state, the part of the grille plate 6 below the support shaft 8 closely adheres to the inner wall surface of the sludge hopper 2. During the downward movement of the grille plate 6, the outer side of the grille plate 6 is limited by the inner side wall of the sludge hopper 2, and the connecting shaft 10 and the support shaft 8 in the chute 12 limit the grille plate 6, so that the grille plate 6 can stably move vertically downward.

[0045] On the basis of the above embodiment, the distance between the bottom end of the grille plate 6 and the center of the support shaft 8 is adapted to the cavity width of the sludge hopper 2. The bottom end of the chute 12 extends outward with an inner relief groove 13, and the length of the inner relief groove 13 is greater than the outer diameter of the support shaft 8.

[0046] By setting the inner relief groove 13, when the support shaft 8 moves to the bottom of the chute 12, the support shaft 8 is flush with the inner relief groove 13 in the height direction. When the grille plate 6 rotates to a nearly horizontal state, the support shaft 8 forms an outward displacement process of the grille plate 6 by moving outward in the inner relief groove 13, so that the relative ends of the two grille plates 6 can move away from each other at this time, thereby preventing the two grille plates 6 from blocking each other when rotating to the horizontal state, and ensuring that the bottom end of the grille plate 6 can cross the horizontal line and rotate to the upward state.

[0047] In a preferred embodiment, the plate driving assembly 7 includes a plate driving oil cylinder 7.1, a plate driving connecting rod 7.2 and a plate driving cross arm 7.3. The plate driving oil cylinder 7.1 is installed on the frame 1. The plate driving connecting rod 7.2 has a "door" - shaped structure. The top end of the plate driving connecting rod 7.2 is fixedly installed on the extending end of the plate driving oil cylinder 7.1. A shaft is provided at the bottom of the plate driving connecting rod 7.2 and the inner ends of the two plate driving cross arms 7.3 are rotatably connected through the shaft. The outer ends of the plate driving cross arms 7.3 are rotatably connected to the connecting shaft 10.

[0048] In the initial state, when the extending end of the plate driving oil cylinder 7.1 extends downward, the plate driving connecting rod 7.2 moves downward. At this time, since both the connecting shaft 10 and the support shaft 8 are located in the chute 12, the plate driving cross arm 7.3 keeps a stable state and pushes the rotating plate 9 downward, and the rotating plate 9 then pushes the grille plate 6 downward. When the support shaft 8 moves to the bottom end of the chute 12, during the process that the plate driving connecting rod 7.2 continues to descend, the inner end of the plate driving cross arm 7.3 is under pressure, so that the outer end of the plate driving cross arm 7.3 rotates outward. At this time, the connecting shaft 10 enters the channel groove 11 from the chute 12. Since then, the grille plate 6 starts to rotate with the support shaft 8 as the fulcrum.

[0049] When the grille plate 6 rotates to a nearly horizontal state and the bottom ends of the two grille plates 6 respectively contact the opposite support shaft 8, the grille plate 6 cannot rotate. At this time, the plate driving cross arm 7.3 rotates outward through the outer end to push the grille plate 6 to move outward, so that the two grille plates 6 move away from each other. During this process, the support shaft 8 moves from the inner end to the outer end of the inner relief groove 13.

[0050] After that, as the plate driving connecting rod 7.2 continues to move downward, the grille plate 6 continues to rotate with the support shaft 8 as the fulcrum. The plate driving cross arm 7.3 rotates itself while pushing the grille plate 6 to rotate. Until the connecting shaft 10 moves to the bottom end of the channel groove 11, the bottom ends of the grille plates 6 are separated from the crossed state and finally show a state with the bottom end inclined upward, and a channel for the stable falling of crushed stones is formed on the plate surface of the grille plate 6.

[0051] Near the inner end of the plate driving cross arm 7.3, a limiting spring can be connected between the two plate driving cross arms 7.3. When the rotating plate 9 moves downward in the chute 12, the limiting spring remains at its natural length without being stretched. When the support shaft 8 moves to the bottom end of the chute 12, the inner end of the plate driving cross arm 7.3 is subjected to the downward pressure of the plate driving connecting rod 7.2, and the connecting shaft 10 enters the channel groove 11 from the chute 12. At this time, the limiting spring is stretched.

[0052] In another preferred embodiment, side plates 14 are provided at the front and rear ends of both sides of the sludge hopper 2. The channel groove 11 is provided on the side plates 14. A storage area 15 is formed between the side plates 14, the hatch door 4, and the side surface of the sludge hopper 2. When the hatch door 4 is in the open state, an impurity inlet 16 is formed between the top of the side wall of the sludge hopper 2 for impurities to slide from the grille plate 6 into the storage area 15, and the bottom end of the hatch door 4 is in contact with the bottom of the side wall of the sludge hopper 2. When the hatch door 4 moves upward in a circular motion in the open state, an impurity outlet 17 is formed between its bottom and the bottom of the side wall of the sludge hopper 2 for the impurities in the storage area 15 to escape.

[0053] Before the hatch door 4 is closed, the gravel in the sludge hopper 2 is screened out by the rotation of the grille plate 6 and then sent into the storage area 15 through the impurity inlet 16 for effective collection, preventing the screened gravel from falling back to the vicinity of the sludge inlet 3 from the side of the sludge hopper 2 to ensure the stable and effective closing of the hatch door 4. When the hatch door 4 is closed, the gravel is still collected in the storage area 15, so that after the sludge is lifted out by the sludge hopper 2, the gravel and the sludge can be cleaned out in a separated collection manner.

[0054] After the sludge in the sludge hopper 2 is discharged by opening the hatch door 4, by opening the hatch door 4 to the maximum state, the impurities in the storage area 15 are discharged from the impurity outlet 17.

[0055] Exemplarily, the hatch door 4 includes a straight plate body 4.1 and an arc plate body 4.2 arranged vertically. The bottoms of the front and rear side surfaces of the sludge hopper 2 are both provided with arc structures adapted to the arc plate body 4.2. When the hatch door 4 is closed, the connection between the straight plate body 4.1 and the arc plate body 4.2 is flush with the bottom of the outer side surface of the sludge hopper 2.

[0056] When the hatch door 4 is normally opened, the setting of the straight plate body 4.1 makes the size of the impurity inlet 16 larger, which is more conducive to collecting the impurities falling from the grille plate 6.

[0057] The scope of protection required by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention can have various deformations and modifications. Any modification, improvement, and equivalent replacement made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel construction site dredging device, characterized in that: It comprises a frame (1) and a sludge bucket (2) fixedly mounted on the frame (1); The upper and lower ends of the sludge hopper (2) are both open, the bottom end of the sludge hopper (2) is open to form a sludge inlet (3), and the two side walls of the sludge hopper (2) are connected to bin doors (4), and the two bin doors (4) are closed when they move downward along an arc trajectory to the middle position of the sludge inlet (3); the sludge hopper (2) is provided with a door driving assembly (5) for controlling the opening or closing of the bin doors (4); The two side walls of the sludge bucket (2) are connected to grid plates (6) in a fork-comb arrangement, and the grid plates (6) are used to screen out impurities from the sludge in the sludge bucket (2) by rotating upward with the top end thereof as the center until the bottom end thereof is tilted upward and separated; the frame (1) is provided with a plate drive assembly (7) for providing power to the grid plates (6); A support shaft (8) is provided at the top end of the grid plate (6), a rotating plate (9) is fixedly connected to the end of the support shaft (8), the grid plate (6) rotates around the support shaft (8), a connecting shaft (10) is provided at the top end of the rotating plate (9), the connecting shaft (10) is connected to the plate driving assembly (7), and channel grooves (11) are provided on both sides of the sludge bucket (2), and when the grid plate (6) rotates, the connecting shaft (10) moves in the channel groove (11); The sludge hopper (2) is provided with longitudinally distributed chutes (12) on both sides, and the top notch of the channel groove (11) is connected to the outer wall of the chutes (12); when the connecting shaft (10) is at the top of the chutes (12), the grille plate (6) is stored inside the sludge hopper (2); when the supporting shaft (8) is located at the bottom of the chutes (12), the connecting shaft (10) is located at the connection between the channel groove (11) and the chutes (12), and the bottom end of the grille plate (6) is located below the side wall of the sludge hopper (2).

2. The tunnel construction site dredging device according to claim 1, characterized in that: The door drive assembly (5) comprises a door drive oil cylinder (5.1), a door drive connecting rod (5.2) and a door drive cross arm (5.3); the door drive oil cylinder (5.1) is mounted on the sludge bucket (2); the extended end of the door drive oil cylinder (5.1) is rotatably connected to two door drive connecting rods (5.2); the bottom end of the door drive connecting rod (5.2) is rotatably connected to the door drive cross arm (5.3); and one end of the door drive cross arm (5.3) away from the door drive connecting rod (5.2) is fixedly connected to the warehouse door (4).

3. The tunnel construction site dredging device according to claim 2, characterized in that: When the grid plate (6) is in a vertical state, the portion of the grid plate (6) below the support shaft (8) is in close contact with the inner wall surface of the sludge bucket (2).

4. The tunnel construction site dredging device according to claim 2 or 3, characterized in that: The distance between the bottom end of the grid plate (6) and the center of the support shaft (8) is adapted to the cavity width of the sludge bucket (2), and an inner retreat groove (13) is extended outward from the bottom end of the slide groove (12), and the length of the inner retreat groove (13) is greater than the outer diameter of the support shaft (8).

5. The tunnel construction site dredging device according to claim 4, characterized in that: The plate drive assembly (7) comprises a plate drive oil cylinder (7.1), a plate drive connecting rod (7.2) and a plate drive cross arm (7.3); the plate drive oil cylinder (7.1) is mounted on the frame (1); the plate drive connecting rod (7.2) is a "door"-shaped structure; the top end of the plate drive connecting rod (7.2) is fixedly connected to the protruding end of the plate drive oil cylinder (7.1); a shaft is provided at the bottom of the plate drive connecting rod (7.2) and is rotatably connected to the inner ends of the two plate drive cross arms (7.3) via the shaft; and the outer end of the plate drive cross arm (7.3) is rotatably connected to the connecting shaft (10).

6. The tunnel construction site dredging device according to claim 5, characterized in that: Both ends of the two side walls of the sludge hopper (2) are provided with side plates (14), the channel groove (11) is arranged on the side plates (14), and a storage area (15) is formed between the side plates (14), the bin door (4) and the side of the sludge hopper (2); When the bin door (4) is in an open state, an impurity inlet (16) is formed between the bin door (4) and the top of the side wall of the sludge hopper (2) for impurities to slide off the grid plate (6) and enter the storage area (15); when the bin door (4) moves upward in a circular motion in an open state, an impurity outlet (17) is formed between the bottom of the bin door (4) and the bottom of the side wall of the sludge hopper (2) for impurities in the storage area (15) to escape.

Images