Tunnel construction site desilting device

Abstract

The invention discloses a dredging device for a tunnel construction site, which belongs to the technical field of tunnel construction and comprises a frame and a sludge hopper fixedly mounted on the frame. The upper end and the lower end of the sludge hopper are open, the opening in the bottom end of the sludge hopper is a sludge inlet, bin doors are connected to the two side walls of the sludge hopper, and the two bin doors are closed when moving downwards to the middle position of the sludge inlet in an arc track. A door driving assembly used for controlling the bin door to be opened or closed is arranged on the sludge hopper; the two side walls of the sludge hopper are connected with grating plates which are matched in a fork-comb mode, and the grating plates are used for screening out impurities in the sludge hopper from sludge when the grating plates rotate upwards with the top ends of the grating plates as centers till the bottom ends of the grating plates incline upwards and are separated; the rack is provided with a plate driving assembly used for providing power for the grating plate. Through cooperation of the grating plate and the bin door, impurities such as gravel in sludge can be synchronously screened out, it is guaranteed that the bin door is effectively closed, and the sludge cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and in particular, relates to a tunnel construction site dredging device. Background Art

[0002] Tunnel construction site dredging is one of the important projects in tunnel construction, which is related to the tunnel's drainage function, traffic safety and long-term stability.

[0003] At present, there are two main methods of dredging at tunnel construction sites: mechanical dredging and hydraulic dredging. Mechanical dredging is suitable for situations where the sludge is thick and covers a large area. It mainly uses a suction truck to suck out the dirt in the pipe. Hydraulic dredging is suitable for situations where the sludge is thin and easy to flush. It uses high-pressure water flow to flush the sludge and then discharges the mud from the tunnel through the drainage system.

[0004] However, in the actual construction process, the silt is often mixed with debris such as gravel generated at the construction site. No matter which of the above mechanical methods is used, it is difficult to effectively separate the silt from the debris such as gravel, which causes difficulties in the subsequent processing procedures. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tunnel construction site dredging device which can screen out impurities such as gravel in the silt.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tunnel construction site dredging device, comprising a frame and a sludge bucket fixedly installed on the frame; The upper and lower ends of the sludge hopper are both open, the bottom end of the sludge hopper is open as a sludge inlet, and the two side walls of the sludge hopper are connected with bin doors, which are closed when they move downward along an arc trajectory to the middle position of the sludge inlet; the sludge hopper is provided with a door drive component for controlling the opening or closing of the bin door; The two side walls of the sludge hopper are connected with grating plates in a fork-comb arrangement, and the grating plates are used to screen out impurities from the sludge in the sludge hopper by rotating upward with the top end as the center until the bottom end is tilted upward and separated; a plate driving assembly for providing power to the grating plates is provided on the frame.

[0007] Furthermore, the door drive assembly includes a door drive cylinder, a door drive connecting rod and a door drive cross arm; the door drive cylinder is installed on the mud bucket, the protruding end of the door drive cylinder is rotatably connected to two door drive connecting rods, the bottom end of the door drive connecting rod is rotatably connected to the door drive cross arm, and the end of the door drive cross arm away from the door drive connecting rod is fixed to the warehouse door.

[0008] Furthermore, a support shaft is provided at the top of the grating plate, a rotating plate is fixedly connected to the end of the support shaft, the grating 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, and channel grooves are provided on both sides of the sludge bucket, and when the grating plate rotates, the connecting shaft displaces in the channel groove.

[0009] Furthermore, longitudinally distributed slide grooves are provided on both sides of the sludge hopper, and the top notch of the channel groove is connected to the outer side wall of the slide groove; when the connecting shaft is at the top of the slide groove, the grille plate is stored inside the sludge hopper; when the support shaft is located at the bottom of the slide groove, the connecting shaft is located at the connection between the channel groove and the slide groove, and the bottom end of the grille plate is located below the side wall of the sludge hopper.

[0010] Furthermore, when the grid plate is in a vertical state, the portion of the grid plate below the support shaft is in close contact with the inner wall surface of the sludge bucket.

[0011] Furthermore, the distance between the bottom end of the grid plate and the center of the support shaft is adapted to the cavity width of the sludge bucket, an inner retreat groove is extended outward from the bottom end of the slide groove, and the length of the inner retreat groove is greater than the outer diameter of the support shaft.

[0012] Furthermore, the plate driving assembly includes a plate driving cylinder, a plate driving connecting rod and a plate driving cross arm; the plate driving cylinder is installed on the frame, the plate driving connecting rod is a "door" shaped structure, the top end of the plate driving connecting rod is fixedly connected to the protruding end of the plate driving cylinder, the bottom of the plate driving connecting rod is provided with a shaft and the inner ends of the two plate driving cross arms are rotatably connected through the shaft, and the outer end of the plate driving cross arm is rotatably connected to the connecting shaft.

[0013] Furthermore, both ends of the two side walls of the sludge hopper are provided with side plates, the channel grooves are provided on the side plates, and a storage area is formed between the side plates, the bin door and the side of the sludge hopper; When the bin door is in an open state, an impurity inlet is formed between the bin door and the top of the side wall of the sludge hopper, for impurities to slide from the grid plate into the storage area; when the bin door moves upward in a circular motion in an open state, an impurity outlet is formed between its bottom and the bottom of the side wall of the sludge hopper, for impurities in the storage area to escape.

[0014] The present invention provides a tunnel construction site silt removal device, which adopts a grating plate and a bin door to cooperate with each other, can realize the simultaneous screening out of impurities such as gravel in the silt, and ensure the effective closure of the bin door, thereby improving the silt cleaning efficiency.

[0015] In addition, the device of the present invention is small in size, flexible in operation, occupies little construction space in the tunnel, and will not affect other construction operations in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 This is a schematic diagram of the tunnel construction site desilting device when the door is opened to the maximum state and impurities are discharged; Figure 2 for Figure 1 A in the enlarged view; Figure 3 It is a structural schematic diagram of the sludge bucket; Figure 4 This is a schematic diagram when the door is opened to the maximum state and the grille plate is rotated to the extreme position; Figure 5 It is a schematic diagram when the door is in a normal open state and the grille plate is in an initial state; Figure 6 This is a schematic diagram of the grid plate being inserted downward into the silt; Figure 7 This is a schematic diagram of the warehouse door in the normal open state and the grille plate rotated to the extreme position.

[0018] In the figure, 1-frame; 2-sludge bucket; 3-sludge inlet; 4-bin door; 4.1-straight plate body; 4.2-arc plate body; 5-door drive assembly; 5.1-door drive cylinder; 5.2-door drive connecting rod; 5.3-door drive cross arm; 6-grating plate; 7-plate drive assembly; 7.1-plate drive cylinder; 7.2-plate drive connecting rod; 7.3-plate drive cross arm; 8-support shaft; 9-turn plate; 10-connecting shaft; 11-channel groove; 12-slide groove; 13-inner retreat groove; 14-side plate; 15-storage area; 16-impurity inlet; 17-impurity outlet. DETAILED DESCRIPTION

[0019] In order to make those skilled in the art better understand the present invention, the present invention is further clearly and completely described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the features in the embodiments and examples of this application can be combined with each other.

[0020] refer to Figures 1 to 7 A typical embodiment of the present invention provides a tunnel construction site desilting device, comprising a frame 1 and a sludge bucket 2 fixedly mounted on the frame 1, wherein the upper and lower ends of the sludge bucket 2 are both open, and the bottom end of the sludge bucket 2 is open as a sludge inlet 3. The inner cavity of the sludge bucket 2 is rectangular, and bin doors 4 are provided on both sides of the sludge bucket 2. When working, the two bin doors 4 move downward along an arc trajectory to the middle position of the sludge inlet 3 and close. The sludge bucket 2 is provided with a door driving component 5 for controlling the opening or closing of the bin doors 4.

[0021] The two side walls of the sludge hopper 2 are connected with a grating plate 6 in a fork-comb arrangement. When the grating plate 6 is rotated upward with its top end as the center to a state in which the bottom end is tilted upward and separated, the impurities in the sludge hopper 2 are screened out from the sludge. In addition, the grating plate 6 is rotated to a state in which the bottom end is tilted upward so that the screened impurities can be detached from the top sides of the sludge hopper 2. A plate driving assembly 7 for providing power to the grating plate 6 is provided on the frame 1.

[0022] According to the tunnel construction site dredging device provided in this embodiment, when working, the equipment can be installed as a whole on the forearm of the excavator through the frame 1, and the bin door 4 is kept in an open state through the door drive assembly 5, so that the silt bucket 2 is inserted into the silt with the silt inlet 3 facing downward. Before closing the bin door 4, the grille plate 6 is driven by the plate drive assembly 7 to move, and the bottom end of the grille plate 6 passes through the inner cavity of the silt bucket 2 from the bottom of the silt bucket 2 to screen out the gravel in the silt.

[0023] In this embodiment, the two grille plates 6 cooperate to lift the gravel near the sludge inlet 3 away from the sludge inlet 3 before the bin door 4 is closed, so as to ensure smoother closing of the bin door 4. In addition, during the discharge of the sludge hopper 2, the sludge and gravel in the sludge hopper 2 can be discharged separately through the grille plates 6, so that the sludge and gravel can be collected separately during the sludge cleaning process.

[0024] At the same time, the rotation direction of the grille plate 6 is from the bottom to the top, so that when the grille plate 6 rotates in the sludge hopper 2, the grille plate 6 will not affect the accumulation of sludge in the sludge hopper 2, and can ensure that the sludge hopper 2 can always accumulate a large amount of sludge to ensure the sludge cleaning efficiency of the sludge hopper 2.

[0025] In a relatively specific embodiment, the door drive assembly 5 includes a door drive cylinder 5.1, a door drive connecting rod 5.2 and a door drive cross arm 5.3. The door drive cylinder 5.1 is installed on the sludge bucket 2. The protruding end of the door drive 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. The 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In a preferred embodiment, longitudinally distributed slide grooves 12 are opened on the front and rear sides of the sludge hopper 2, and the top notch of the channel groove 11 is connected to the outer wall of the slide groove 12. When the connecting shaft 10 is at the top of the slide groove 12, the grille plate 6 is stored in the sludge hopper 2; when the support shaft 8 is located at the bottom of the slide groove 12, the connecting shaft 10 is located at the connection between the channel groove 11 and the slide groove 12, and the bottom end of the grille plate 6 is located below the side wall of the sludge hopper 2. When the grille plate 6 rotates, the circular trajectory of its bottom end covers the circular trajectory of the bottom end of the bin door 4 when the bin door 4 is closed.

[0032] In this embodiment, when the sludge bucket 2 is inserted into the sludge, the grille plate 6 is stored inside the sludge bucket 2, so it does not affect the insertion of the sludge bucket 2 into the sludge. Before the door 4 is closed, the grille plate 6 first moves downward in the sludge bucket 2, and the bottom end of the grille plate 6 extends downward from the sludge inlet 3 to the bottom of the sludge bucket 2.

[0033] During the rotation of the grille plate 6, the bottom of the grille plate 6 will pass over the arc track of the bottom end of the door 4 when the door 4 is closed, so that the gravel blocking the closing track of the door 4 can be cleared in advance, ensuring that the door 4 can be closed more smoothly. In addition, by setting the grille plate 6, when the door 4 cannot be closed normally, the grille plate 6 can be repeatedly moved several times to assist the door 4 in effectively clearing the gravel on its closing track, so as to more effectively ensure the normal closing of the door 4.

[0034] In the initial state, the connecting shaft 10 is located at the top of the slide slot 12. When the grille plate 6 descends, the connecting shaft 10 and the supporting shaft 8 both slide downward in the slide slot 12. When the supporting shaft 8 moves to the bottom of the slide slot 12, the supporting shaft 8 supports the grille plate 6 and is transformed into a fulcrum for the rotation of the grille plate 6. Afterwards, the connecting shaft 10 enters the channel slot 11 and moves in the channel slot 11. At this time, the rotating plate 9 drives the grille plate 6 to rotate through the supporting shaft 8.

[0035] In a relatively specific embodiment, 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. During the descent of the grid plate 6, the outer side of the grid plate 6 is limited by the inner wall of the sludge bucket 2, and the connecting shaft 10 and the support shaft 8 are located in the slide groove 12 to limit the grid plate 6, so that the grid plate 6 can stably move vertically downward.

[0036] Based on the above embodiment, 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 hopper 2, and an inner retreat groove 13 extends 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.

[0037] By setting the inner retreat groove 13, when the support shaft 8 moves to the bottom of the slide groove 12, the support shaft 8 is flush with the inner retreat groove 13 in the height direction. When the grille plate 6 rotates to a nearly horizontal state, the support shaft 8 moves outward in the inner retreat groove 13 to form an outward movement process of the grille plate 6, so that the opposite 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 a horizontal state, and ensuring that the bottom end of the grille plate 6 can cross the horizontal line and rotate to an upward state.

[0038] In a preferred embodiment, the plate drive assembly 7 includes a plate drive cylinder 7.1, a plate drive connecting rod 7.2 and a plate drive cross arm 7.3. The plate drive cylinder 7.1 is installed on the frame 1, the plate drive connecting rod 7.2 is a "door" shaped structure, the top of the plate drive connecting rod 7.2 is fixedly installed on the protruding end of the plate drive cylinder 7.1, and the bottom of the plate drive connecting rod 7.2 is provided with an axis and the inner ends of the two plate drive cross arms 7.3 are rotatably connected through the axis, and the outer end of the plate drive cross arm 7.3 is rotatably connected to the connecting shaft 10.

[0039] In the initial state, when the extended end of the plate driving oil cylinder 7.1 extends downward, the plate driving connecting rod 7.2 moves downward. At this time, since the connecting shaft 10 and the supporting shaft 8 are both located in the slide slot 12, the plate driving cross arm 7.3 maintains a stable state to push the rotating plate 9 downward, and the rotating plate 9 pushes the grille plate 6 to move downward. When the supporting shaft 8 moves to the bottom end of the slide slot 12, the inner end of the plate driving cross arm 7.3 is subjected to pressure during the process of the plate driving connecting rod 7.2 continuing to descend, so that the outer end of the plate driving cross arm 7.3 rotates outward. At this time, the connecting shaft 10 will enter the channel groove 11 from the slide slot 12, and from then on, the grille plate 6 begins to rotate with the supporting shaft 8 as the fulcrum.

[0040] When the grille plates 6 rotate to a nearly horizontal state and the bottom ends of the two grille plates 6 respectively contact the opposite support shafts 8, the grille plates 6 cannot rotate. At this time, the plate driving cross arm 7.3 continues to rotate outward through the outer end to push the grille plates 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 of the inner retreat groove 13 to the outer end.

[0041] Afterwards, as the plate driving connecting rod 7.2 continues to move downward, the grille plate 6 continues to rotate with the supporting shaft 8 as the fulcrum, and the plate driving cross arm 7.3 rotates 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 end of the grille plate 6 separates from the crossed state, and finally presents a state in which the bottom end is tilted upward, and the plate surface of the grille plate 6 forms a channel for the stable falling of gravel.

[0042] A limit spring may be connected between the two plate drive cross arms 7.3 near the inner end of the plate drive cross arm 7.3, and when the rotating plate 9 moves downward in the slide slot 12, the limit spring is kept at a natural length that is not stretched. When the support shaft 8 moves to the bottom end of the slide slot 12, the inner end of the plate drive cross arm 7.3 is pressed downward by the plate drive connecting rod 7.2, and the connecting shaft 10 enters the channel groove 11 from the slide slot 12, and at this time, the limit spring is stretched.

[0043] In another preferred embodiment, side panels 14 are provided at both front and rear ends of both sides of the sludge hopper 2, and the channel groove 11 is provided on the side panels 14. A storage area 15 is formed between the side panels 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 from the grille plate 6 into the storage area 15, and the bottom end of the bin door 4 is in contact with the bottom of the side wall of the sludge hopper 2. When the bin door 4 makes a circular motion upward in an open state, an impurity outlet 17 is formed between its bottom and the bottom of the side wall of the sludge hopper 2 for impurities in the storage area 15 to escape.

[0044] Before the door 4 is closed, the crushed stones in the sludge bucket 2 are screened out by the rotation of the grid plate 6 and then sent to the storage area 15 through the impurity inlet 16 to be effectively collected, so as to prevent the screened crushed stones from falling from the side of the sludge bucket 2 to the vicinity of the sludge inlet 3 again, so as to ensure the stable and effective closing of the door 4. When the door 4 is closed, the crushed stones are still collected in the storage area 15, so that after the sludge is taken out by the sludge bucket 2, the crushed stones and sludge are cleaned out in a zoned collection manner.

[0045] After the bin door 4 is opened to discharge the sludge in the sludge hopper 2 , the impurities in the storage area 15 are discharged from the impurity outlet 17 by opening the bin door 4 to the maximum state.

[0046] Exemplarily, the bin door 4 includes a straight plate body 4.1 and an arc-shaped plate body 4.2 distributed up and down, and the bottoms of the front and rear sides of the sludge hopper 2 are both configured to be arc-shaped structures that match the arc-shaped plate body 4.2. When the bin door 4 is closed, the connection between the straight plate body 4.1 and the arc-shaped plate body 4.2 is flush with the bottom of the outer side of the sludge hopper 2.

[0047] When the door 4 is normally opened, the arrangement of the straight plate body 4 . 1 makes the size of the impurity inlet 16 larger, which is more conducive to collecting the impurities dropped from the grid plate 6 .

[0048] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions 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 as the center until the bottom end is tilted upward and separated; the frame (1) is provided with a plate drive assembly (7) for providing power to the grid plates (6).

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 1 or 2, characterized in that: A support shaft (8) is provided at the top end of the grating plate (6), 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 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 grating plate (6) rotates, the connecting shaft (10) moves in the channel groove (11).

4. The tunnel construction site dredging device according to claim 3, characterized in that: 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).

5. The tunnel construction site dredging device according to claim 4, 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).

6. The tunnel construction site dredging device according to claim 4 or 5, 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).

7. The tunnel construction site dredging device according to claim 6, 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).

8. The tunnel construction site dredging device according to claim 7, 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.

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