Groove excavation protection early warning device

Abstract

The invention relates to the technical field of engineering construction safety, in particular to a trench excavation protection early warning device. Comprising a mounting rack; the hook is connected to the top of the mounting frame; the universal wheels are symmetrically and rotationally connected to the bottom of the mounting frame; the rotating rods are symmetrically and rotationally connected into the mounting frame; the steel wire rope net is wound on the outer side of the rotating rod, and one end of the steel wire rope net is connected with the rotating rod; the U-shaped rods are symmetrically connected to the mounting frame in a sliding mode, and the other ends of the steel wire rope nets are connected with the U-shaped rods. The soil displacement condition of the inner wall of the groove is monitored in real time through the distance sensor in the detection assembly, the controller and the alarm are combined, an audible and visual alarm can be immediately given out when the collapse symptom of the groove wall occurs, workers are reminded to avoid risks, compared with traditional manual visual inspection judgment, the device can sense risks in advance, sudden collapse accidents are effectively avoided, and the working efficiency is improved. And the safety of operation in the groove is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction safety, and in particular to a trench excavation protection and early warning device. Background Art

[0002] In the fields of municipal construction, underground pipeline laying and construction engineering, trench excavation is a basic and high-frequency construction link. The traditional trench excavation process usually adopts the "mechanical rough excavation + manual fine finishing" operation mode, that is, the excavation equipment first excavates the initial trench outline at the preset position, and then the construction personnel enter the bottom of the trench to perform fine finishing and pipeline positioning operations.

[0003] However, with the increasing density of urban underground space development, coupled with complex soil conditions, changes in groundwater levels or improper construction operations, trenches are prone to slope instability during excavation, which in turn leads to trench wall collapse. At this time, if workers are working in the trench, they are very likely to be buried by the collapsed soil due to the suddenness of the collapse and limited evacuation channels, resulting in personal injury and death accidents, and the construction safety risk is extremely high. In the existing technology, rigid structures such as steel sheet piles, channel steel supports or wooden retaining boards are sometimes used to temporarily support the trench side walls. However, the support structure needs to be installed manually after mechanical excavation. Workers entering the initial trench without protection will also be exposed to the risk of collapse. Moreover, the installation efficiency of the support structure is difficult to match the trench excavation progress. Especially in narrow or deep trenches, the layout of the support system often leads to an extension of the construction period, affecting construction efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a trench excavation protection and warning device, which can overcome the shortcomings of the existing trench excavation process, in which workers working in the trench are exposed to the risk of collapse and are very likely to be buried by the collapsed soil, causing serious personal injury or even life-threatening danger, and having low safety.

[0005] The technical solution of the present invention is: a trench excavation protection and early warning device, comprising: a mounting frame; a hook connected to the top of the mounting frame; a universal wheel, symmetrically rotatably connected to the bottom of the mounting frame; a rotating rod, symmetrically rotatably connected to the inside of the mounting frame; a wire rope net, wound around the outside of the rotating rod, and one end of the wire rope net is connected to the rotating rod; a U-shaped rod, symmetrically slidably connected to the mounting frame, and the other end of the wire rope net is connected to the U-shaped rod; a synchronous belt assembly, consisting of two synchronous wheels and a synchronous belt, and the synchronous wheel is connected to the upper end of the rotating rod, and the synchronous belt is wound around the synchronous wheel; a detection assembly, arranged on the mounting frame, for detecting the protrusion of the inner wall of the trench; a centering assembly, arranged on the mounting frame, for centering the trench excavation protection and early warning device.

[0006] In one embodiment, the detection component includes: a controller, installed on the inner wall of the mounting frame; an alarm, symmetrically installed on the inner wall of the mounting frame; a guide column, symmetrically connected to both sides of the mounting frame; a sliding seat, slidably connected to the guide column; a distance sensor, installed on the side of the sliding seat; and a locking mechanism, arranged on the sliding seat, for locking the sliding seat.

[0007] In one embodiment, the locking mechanism includes: a rotating tube, which is arranged between the sliding seats on the upper and lower sides; a screw, which is symmetrically slidably connected to the inside of the rotating tube, and the end of the screw is threadedly connected to the sliding seat; an insertion rod, which is symmetrically slidably connected to the inside of the rotating tube; a connecting spring, which connects the insertion rod and the rotating tube; a fixed tube, which is connected to the sliding seat, and the end of the insertion rod is inserted into the fixed tube.

[0008] In one embodiment, the centering component includes: a connecting seat, symmetrically connected to both sides of the mounting frame; a swing rod, rotatably connected to the connecting seat; a roller, rotatably connected to the end of the swing rod; a torsion spring, connecting the swing rod and the connecting seat; and a folding mechanism, arranged on the mounting frame, for controlling the swing rod to swing and fold.

[0009] In one embodiment, the folding mechanism includes: a driving motor symmetrically mounted on both sides of the mounting frame; a push plate connected to the output shaft of the driving motor, and the push plate is in contact with the swing rod.

[0010] In one embodiment, it also includes: a fixed seat, symmetrically connected to the inner wall of the mounting frame; a baffle, rotatably connected to the fixed seat; a limit plate, connected to the fixed seat, and the limit plate is in contact with the baffle; an arc handle, connected to the side of the baffle; and a sliding sleeve, slidably connected to the arc handle.

[0011] In one embodiment, the present invention further comprises: a first guide rod connected to the inner wall of the mounting frame; a ladder rotatably connected to the first guide rod; and a fixing mechanism provided on the mounting frame for fixing the position of the ladder.

[0012] In one embodiment, the fixing mechanism includes: a second guide rod connected to the inner wall of the mounting frame, a card slot being formed on the outer wall of the second guide rod, and a U-shaped groove being formed on the end of the ladder away from the first guide rod, the U-shaped groove being sleeved on the outer wall of the second guide rod; a spring clip being symmetrically mounted on the inner wall of the U-shaped groove, and the spring clip being engaged with the card slot.

[0013] Beneficial effects: 1. The present invention monitors the soil displacement of the inner wall of the trench in real time through the distance sensor in the detection component. Combined with the controller and the alarm, it can immediately issue an audible and visual alarm when signs of collapse appear on the trench wall, reminding workers to avoid danger. Compared with traditional manual visual judgment, the device can perceive risks in advance, effectively avoid sudden collapse accidents, and significantly improve the safety of operations in the trench.

[0014] 2. The present invention realizes the dynamic retraction and extension of the wire rope net through the linkage design of the wire rope net, the rotating rod and the U-shaped rod, in conjunction with the synchronous belt assembly. When workers move to different sections of the trench to work, the U-shaped rod can slide laterally to adjust its position, driving the wire rope net to synchronously unfold or reel in, always maintaining full coverage of the trench sidewalls. Once a collapse occurs, the wire rope net can effectively prevent earth from invading the working area, and the opening design of the U-shaped rod allows a small amount of soil to pass through, avoiding impact damage caused by complete blockage, and achieving a balance between protection and working space.

[0015] 3. The present invention ensures that the device is always located in the center of the trench through the function of the centering component, avoiding monitoring blind spots caused by deviation. At the same time, the ladder is fixed to the second guide rod through a spring clip and can be quickly released in an emergency to form an escape route. The baffle and the sliding sleeve further close the lateral space of the mounting frame to prevent the collapse of soil, providing workers with double protection and an efficient evacuation path, greatly reducing the risk of casualties in accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 The figure is a schematic diagram of the installation of the rotating rod, wire rope net, U-shaped rod and synchronous belt assembly of the present invention.

[0018] Figure 3 Schematic diagram of the installation of the detection component of the present invention.

[0019] Figure 4 Schematic diagram of the installation of the locking mechanism of the present invention.

[0020] Figure 5 Schematic diagram of the specific structure of the locking mechanism of the present invention.

[0021] Figure 6 For the present invention Figure 5 Magnified view of part A.

[0022] Figure 7 This is a schematic diagram of the installation of the centering component of the present invention.

[0023] Figure 8 It is a schematic diagram of the specific structure of the centering component of the present invention.

[0024] Figure 9 It is a schematic diagram of the installation of the fixing seat, baffle, limit plate and first guide rod of the present invention.

[0025] Figure 10 Schematic diagram of the specific structure of the second guide rod of the present invention.

[0026] Figure 11 It is a schematic diagram of the specific structure of the ladder of the present invention.

[0027] Marked in the figure: 1-mounting frame, 2-hook, 3-universal wheel, 4-rotating rod, 5-wire rope net, 6-U-shaped rod, 7-synchronous belt assembly, 8-controller, 9-alarm, 10-guide column, 11-sliding seat, 12-distance sensor, 13-rotating tube, 14-screw, 15-insertion rod, 16-connecting spring, 17-fixed tube, 18-connecting seat, 19-swinging rod, 20-roller, 21-torsion spring, 22-drive motor, 23-push plate, 24-fixed seat, 25-baffle, 26-limiting plate, 27-arc handle, 28-sleeve, 29-first guide rod, 30-ladder, 31-second guide rod, 3101-slot, 32-U-shaped slot, 33-spring buckle. DETAILED DESCRIPTION

[0028] Example: A trench excavation protection and early warning device, such as Figures 1-8 As shown, it includes a mounting frame 1, a hook 2, a universal wheel 3, a rotating rod 4, a wire rope net 5, a U-shaped rod 6, a synchronous belt assembly 7, a detection assembly and a centering assembly. The top middle of the mounting frame 1 is connected with a hook 2, and the bottom of the mounting frame 1 is symmetrically rotated and installed with a universal wheel 3. The number of the universal wheels 3 is four and they are distributed in a rectangular shape. The front and back sides of the mounting frame 1 are both symmetrically rotated and connected with the rotating rod 4. The number of the rotating rod 4 is four. The outside of the four rotating rods 4 is wrapped with a wire rope net 5, and one end of the wire rope net 5 is fixedly connected to the rotating rod 4. The mounting frame 1 A U-shaped rod 6 is slidably connected to the middle of the front and rear sides, the opening of the U-shaped rod 6 faces downward, and the wire rope nets 5 on the left and right sides of the U-shaped rod 6 are fixedly connected to the U-shaped rod 6. The synchronous belt assembly 7 consists of two synchronous wheels and a synchronous belt. The upper ends of the four rotating rods 4 are connected to synchronous wheels, and a synchronous belt is wound between the two corresponding synchronous wheels on the left and right so that the rotating rods 4 on the left and right sides can rotate synchronously. A detection component for detecting the protrusion of the inner wall of the groove is provided on the mounting frame 1, and a centering component for centering the device is also provided on the mounting frame 1.

[0029] like Figure 3-Figure 6As shown, the detection component includes a controller 8, an alarm 9, a guide column 10, a sliding seat 11, a distance sensor 12 and a locking mechanism. The controller 8 is installed on the upper right part of the rear side of the inner wall of the mounting frame 1. Alarms 9 are installed symmetrically on the upper parts of the front and rear sides of the inner wall of the mounting frame 1. The number of alarms 9 is four. The left and right sides of the mounting frame 1 are symmetrically connected with guide columns 10. The number of guide columns 10 is eight. Each guide column 10 is slidably connected to a sliding seat 11. A distance sensor 12 is installed on the side of the sliding seat 11 away from the mounting frame 1. A locking mechanism for locking the sliding seat 11 is provided on the sliding seat 11; the locking mechanism includes a rotary The movable tube 13, the screw 14, the insertion rod 15, the connecting spring 16 and the fixed tube 17 are provided between the two corresponding sliding seats 11 above and below. The upper and lower sides of the rotating tube 13 are slidably connected with the screw 14. The screw 14 corresponds to the sliding seat 11 one by one. The end of the screw 14 is threadedly connected to the corresponding sliding seat 11, and the end of the screw 14 is in contact with the surface of the guide column 10. The upper and lower sides of the rotating tube 13 are slidably connected with the insertion rod 15. A connecting spring 16 is connected between the insertion rod 15 and the rotating tube 13. Two fixed tubes 17 are connected to each sliding seat 11, and the end of the insertion rod 15 is inserted into one of the fixed tubes 17.

[0030] like Figure 7 and Figure 8 As shown, the centering component includes a connecting seat 18, a swing rod 19, a roller 20, a torsion spring 21 and a folding mechanism. The lower parts of the left and right sides of the mounting frame 1 are symmetrically connected to the connecting seats 18. The four connecting seats 18 are rotatably connected to the swing rods 19. The ends of the swing rods 19 away from the mounting frame 1 are rotatably connected to the rollers 20. The rotating shafts of the swing rods 19 are wound with torsion springs 21. The two ends of the torsion springs 21 are respectively connected to the swing rods 19 and the connecting seat 18. The mounting frame 1 is provided with a folding mechanism for controlling the swing rod 19 to swing and fold; the folding mechanism includes a driving motor 22 and a push plate 23. The lower parts of the left and right sides of the mounting frame 1 are symmetrically installed with driving motors 22. The output shaft of each driving motor 22 is connected to a push plate 23, and the push plate 23 is in contact with the swing rod 19.

[0031] When the device is needed, first use the excavation equipment to dig the initial trench outline at the preset position, then control the driving motor 22 through the controller 8 to drive the push plate 23 to rotate, so that the push plate 23 can push the swing rods 19 on the front and rear sides to swing closer to each other and retract, the torsion spring 21 is deformed, and the swing rod 19 can drive the rollers 20 on the front and rear sides to swing closer to each other and retract, then hang the hook 2 on the hook of the crane, and place the device in the trench by the crane, the universal wheel 3 will contact the inner bottom of the trench, and then control the driving motor 22 through the controller 8 to drive the push plate 23 to push the swing rods 19 on the front and rear sides to swing closer to each other and retract, and then the torsion spring 21 is deformed, and the swing rod 19 can drive the rollers 20 on the front and rear sides to swing closer to each other and retract, and then hang the hook 2 on the hook of the crane, and place the device in the trench by the crane, and the universal wheel 3 will contact the inner bottom of the trench, and then control the driving motor 22 through the controller 8 to drive the push plate 23 to push the swing rod 19 on the front and rear sides to swing closer to each other and retract, and then the torsion spring 21 is deformed, and the swing rod 19 can drive the rollers 20 on the front and rear sides to swing closer to each other and retract, and then hang the hook 2 on the hook of the crane, and place the device in the trench by the crane, and the universal wheel 3 will contact the inner bottom of the trench, and then The plate 23 is reversed, so that the push plate 23 is separated from the swing rod 19. At this time, the torsion spring 21 will return to its original state, driving the swing rods 19 and the rollers 20 on the front and rear sides to swing away from each other, until the rollers 20 on the front and rear sides respectively contact the front and rear sides of the inner wall of the groove. Through the mutual squeezing between the rollers 20 and the groove, the device can automatically adjust its position in the groove to ensure that the device is in the middle position of the groove; then the worker can enter the mounting frame 1, and then hold the rotating tube 13 by hand to control the rotating tube 13 to rotate, and the rotating tube 13 can drive the screw 14 and the insertion rod 15 to rotate. The rod 15 is moved vertically with the other fixed tube 17, and the rod 15 is inserted into the other fixed tube 17 under the action of the connecting spring 16, thereby limiting the rotation tube 13 and preventing the rotation tube 13 from rotating at will. Then, the rotation tube 13 can be moved back and forth according to the distance between the mounting bracket 1 and the inner wall of the groove, and the rotation tube 13 can be rotated. The screw 14, the sliding seat 11 and the distance sensor 12 are driven to move forward and backward to adjust the position of the distance sensor 12. After the position of the distance sensor 12 is adjusted, the rotating tube 13 can be held and controlled to reverse. The rotating tube 13 can drive the screw 14 and the insertion rod 15 to reverse. The screws 14 on the upper and lower sides will move away from each other along the inner wall of the rotating tube 13 to reset, so that the ends of the screws 14 contact the guide column 10. The friction between the screws 14 and the guide column 10 can limit the sliding seat 11 to prevent the sliding seat 11 from moving forward and backward at will.At this time, the worker can perform fine trimming and pipeline positioning operations on the inner side of the mounting frame 1, or pass the tool through the inner side of the U-shaped rod 6 to perform fine trimming on the inner wall of the groove. When fine trimming is required at different positions of the inner wall of the groove, the U-shaped rod 6 can be moved left and right to align the U-shaped rod 6 with the position of the inner wall of the groove that needs fine trimming. Under the cooperation of the rotating rod 4 and the synchronous belt assembly 7, the wire rope nets 5 on the left and right sides of the U-shaped rod 6 will be retracted and extended accordingly (for example: when the U-shaped rod 6 moves to the right, the U-shaped rod 6 will move to the right, and the U-shaped rod 6 will move to the left and right to align with the position of the inner wall of the groove that needs fine trimming). 6 will pull the left wire rope net 5 to move to the right and loosen the right wire rope net 5. At the same time, the U-shaped rod 6 can pull the left rotating rod 4 to rotate through the left wire rope net 5. The left rotating rod 4 can drive the right rotating rod 4 to rotate through the synchronous belt assembly 7, so that the right rotating rod 4 can reel in the right wire rope net 5), ensuring that the left and right wire rope nets 5 are always in a straight state. When the groove inner wall is finely trimmed in the areas on the front and rear sides of the device, the device can be pushed under the action of the universal wheel 3. The device moves to the next area within the trench, facilitating detailed finishing work for the next area. During movement, the rollers 20 also move along the inner wall of the trench. These rollers ensure the device remains centered during movement, preventing excessive horizontal displacement. Distance sensors 12 constantly monitor the inner wall of the trench. Their monitoring range is 3 meters. When a distance sensor 12 detects that the displacement of the trench inner wall exceeds a preset threshold, a collapse risk is identified. The sensor 12 emits a signal, which the controller 8 controls to sound an alarm, warning workers against moving in that direction. If the inner wall of the trench collapses at the mounting frame 1, the wire rope net 5 blocks the soil on both sides of the mounting frame 1, providing a safe working environment for the workers. Only a small amount of soil will pass through the inner side of the U-shaped rod 6 and enter the mounting frame 1, posing no threat to workers.

[0032] like Figure 9 As shown, it also includes a fixed seat 24, a baffle 25, a limit plate 26, an arc handle 27 and a sliding sleeve 28. The front and rear sides of the inner wall of the mounting frame 1 are symmetrically connected with the fixed seat 24, and the four fixed seats 24 are rotatably connected with the baffle 25. The two corresponding front and rear baffles 25 are in contact with each other. The four fixed seats 24 are connected with a limit plate 26, and the limit plate 26 is located on the inner side of the baffle 25, and the limit plate 26 is in contact with the baffle 25. The upper part of the side where the four baffles 25 are close to each other is connected with an arc handle 27, and the two corresponding front and rear arc handles 27 are in contact with each other, and a sliding sleeve 28 is slidably connected between the two corresponding front and rear arc handles 27.

[0033] When the worker needs to enter the mounting frame 1, he can first rotate the baffle 25 to the side away from the mounting frame 1 to open it, so that the baffle 25 is disengaged from the limit plate 26. Then the worker can enter the mounting frame 1 and then rotate the baffle 25 to the side close to the mounting frame 1 to reset it, so that the baffle 25 and the limit plate 26 can contact each other again. The limit plate 26 can limit the baffle 25 to prevent the baffle 25 from continuing to rotate to the side close to the mounting frame 1. Then the sliding sleeve 28 can be slid back and forth so that the ends of the two arc-shaped handles 27 that contact each other are located inside the sliding sleeve 28. Through the cooperation of the sliding sleeve 28 and the arc-shaped handle 27, the baffle 25 can be locked to prevent the baffle 25 from rotating. When a collapse accident occurs on the left and right sides of the mounting frame 1, the baffle 25 can block the soil to prevent soil from entering the mounting frame 1, thereby ensuring the safety of the workers.

[0034] like Figures 9-11 The figure shows that it also includes a first guide rod 29, a ladder 30 and a fixing mechanism. The first guide rod 29 is connected to the upper left portion of the inner wall of the mounting frame 1, and the ladder 30 is rotatably connected to the first guide rod 29. The mounting frame 1 is provided with a fixing mechanism for fixing the position of the ladder 30; the fixing mechanism includes a second guide rod 31 and a spring clip 33, and the second guide rod 31 is connected to the upper right portion of the inner wall of the mounting frame 1. A card slot 3101 is provided on the left side of the second guide rod 31, and a U-shaped groove 32 is provided at the right end of the ladder 30. The U-shaped groove 32 can be sleeved on the outside of the second guide rod 31, and spring clips 33 are symmetrically installed on the left side of the inner wall of the U-shaped groove 32. The spring clip 33 is stuck in the card slot 3101 to fix the ladder 30.

[0035] When the worker needs to enter the installation frame 1, he can directly press the ladder 30 downward on the ground to make the ladder 30 rotate downward with the first guide rod 29 as the rotation center. The ladder 30 can drive the spring clip 33 to rotate downward and disengage from the slot 3101, and the U-shaped slot 32 will also disengage from the second guide rod 31. Then the worker can use the ladder 30 to climb down directly from the ground to the installation frame 1, and then rotate the ladder 30 upward to reset it, so that the U-shaped slot 32 is re-sheathed on the outside of the second guide rod 31, and the spring clip 33 is stuck in the slot 3101, so that the ladder 30 can be fixed to the top of the installation frame 1 without affecting the subsequent work of the workers. When a collapse accident occurs, repeat the above operation to put down the ladder 30, and the worker can use the ladder 30 to climb up directly from the groove to the ground, so that the worker can quickly escape from the danger zone.

Claims

1. A trench excavation protection and warning device, comprising: a mounting frame (1); characterized in that: The invention also includes: a hook (2) connected to the top of the mounting frame (1); a universal wheel (3) symmetrically rotatably connected to the bottom of the mounting frame (1); a rotating rod (4) symmetrically rotatably connected to the inside of the mounting frame (1); a wire rope net (5) wound around the outside of the rotating rod (4), and one end of the wire rope net (5) is connected to the rotating rod (4); a U-shaped rod (6) symmetrically slidably connected to the mounting frame (1), and the other end of the wire rope net (5) is connected to the U-shaped rod (6); a synchronous belt assembly (7) composed of two synchronous wheels and a synchronous belt, and the synchronous wheel is connected to the upper end of the rotating rod (4), and the synchronous belt is wound around the synchronous wheel; a detection assembly provided on the mounting frame (1) for detecting the protrusion of the inner wall of the groove; and a centering assembly provided on the mounting frame (1) for centering the groove excavation protection warning device.

2. A trench excavation protection and warning device according to claim 1, characterized in that: The detection component comprises: a controller (8), mounted on the inner wall of the mounting frame (1); an alarm (9), symmetrically mounted on the inner wall of the mounting frame (1); a guide column (10), symmetrically connected to both sides of the mounting frame (1); a sliding seat (11), slidably connected to the guide column (10); a distance sensor (12), mounted on the side of the sliding seat (11); and a locking mechanism, provided on the sliding seat (11) and used for locking the sliding seat (11).

3. A trench excavation protection and early warning device according to claim 2, characterized in that: The locking mechanism comprises: a rotating tube (13) arranged between the upper and lower sliding seats (11); a screw rod (14) symmetrically slidably connected to the inside of the rotating tube (13), and the end of the screw rod (14) is threadedly connected to the sliding seat (11); an insertion rod (15) symmetrically slidably connected to the inside of the rotating tube (13); a connecting spring (16) connecting the insertion rod (15) and the rotating tube (13); and a fixed tube (17) connected to the sliding seat (11), and the end of the insertion rod (15) is inserted into the fixed tube (17).

4. A trench excavation protection and warning device according to claim 1, characterized in that: The centering component includes: a connecting seat (18) symmetrically connected to both sides of the mounting frame (1); a swing rod (19) rotatably connected to the connecting seat (18); a roller (20) rotatably connected to the end of the swing rod (19); a torsion spring (21) connecting the swing rod (19) and the connecting seat (18); and a retracting mechanism provided on the mounting frame (1) for controlling the swing rod (19) to swing and retract.

5. A trench excavation protection and early warning device according to claim 4, characterized in that: The stowage mechanism comprises: a driving motor (22) symmetrically mounted on both sides of the mounting frame (1); a push plate (23) connected to the output shaft of the driving motor (22), and the push plate (23) is in contact with the swing rod (19).

6. A trench excavation protection and early warning device according to claim 1, characterized in that: The utility model further comprises: a fixing seat (24) symmetrically connected to the inner wall of the mounting frame (1); a baffle (25) rotatably connected to the fixing seat (24); a limiting plate (26) connected to the fixing seat (24), and the limiting plate (26) and the baffle (25) are in contact and fit; an arc handle (27) connected to the side of the baffle (25); and a sliding sleeve (28) slidably connected to the arc handle (27).

7. A trench excavation protection and warning device according to claim 1, characterized in that: It also includes: a first guide rod (29) connected to the inner wall of the mounting frame (1); a ladder (30) rotatably connected to the first guide rod (29); and a fixing mechanism provided on the mounting frame (1) for fixing the position of the ladder (30).

8. A trench excavation protection and warning device according to claim 7, characterized in that: The fixing mechanism comprises: a second guide rod (31) connected to the inner wall of the mounting frame (1); a clamping groove (3101) is formed on the outer wall of the second guide rod (31); and a U-shaped groove (32) is formed on the end of the ladder (30) away from the first guide rod (29); the U-shaped groove (32) is sleeved on the outer wall of the second guide rod (31); and a spring buckle (33) symmetrically mounted on the inner wall of the U-shaped groove (32), and the spring buckle (33) is engaged with the clamping groove (3101).

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