Tunnel excavation intelligent platform with automatic protection device based on plc control

Abstract

The application relates to the technical field of tunnel bench technology, and discloses a tunnel excavation intelligent bench with automatic protection device based on PLC control, which comprises a supporting rod, the surface of the supporting rod is sequentially fixedly provided with a top layer plate, an intermediate plate and a bottom layer plate from top to bottom, two elliptic rods are arranged between the top layer plate and the intermediate plate, the top layer plate and the intermediate plate are fixedly connected through the elliptic rods, a PLC control box is fixedly installed on the outer surface of the supporting rod, and a protection ladder is fixedly installed on the surface of the supporting rod and below the intermediate plate and the bottom layer plate. The protection escape hole, the elliptic rod and the handrail rod and other structures are matched, so that when the tunnel excavation bench is used and a local collapse accident occurs in the tunnel, the staff only needs to open the steel plate covering the protection escape hole and hold the handrail rod, can slide to the tunnel ground from the high layer of the excavation bench by using the handrail rod, and the escape speed of the staff is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel excavation technology, specifically to a PLC-controlled intelligent tunnel excavation platform with automatic protection devices. Background Technology

[0002] Tunnels are structures built underground, underwater, or within mountains to carry railways or highways for motor vehicles. During tunnel construction, a construction platform is required. This platform serves as the work platform for tunnel excavation and initial support. The length, width, and height of the platform are calculated based on the tunnel's excavation dimensions to ensure the quality and safety of mountain tunnel excavation and initial support. Modern construction platforms are equipped with intelligent mobility, featuring tracked wheels at the bottom and a PLC control box for movement.

[0003] Traditional intelligent tunnel excavation platforms mainly have the following disadvantages:

[0004] (1) Poor safety. In the event of a partial tunnel collapse, the PLC controller of a traditional intelligent tunnel excavation platform cannot immediately cut off the power to the platform. This greatly increases the probability of damaged wires coming into contact with the platform, thus amplifying the leakage phenomenon.

[0005] (2) Inability to cope with tunnel emergencies. In the event of a partial tunnel collapse, the construction workers on the traditional intelligent tunnel excavation platform can only climb down to the ground via ladders, which greatly increases the difficulty of their escape. If there are multiple people working on the platform, a stampede is very likely to occur.

[0006] In summary, it is necessary to design an intelligent tunnel excavation platform with automatic protection devices based on PLC control. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a PLC-controlled intelligent tunnel excavation platform with automatic protection devices, thus solving the problems mentioned in the background section.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the present invention provides the following technical solution: a PLC-controlled intelligent tunnel excavation platform with an automatic protection device, comprising a support rod. A top plate, a middle plate, and a bottom plate are fixedly mounted on the surface of the support rod from top to bottom. Two elliptical rods are arranged between the top plate and the middle plate, and the top plate and the middle plate are fixedly connected by the elliptical rods. A PLC control box is fixedly mounted on the outer surface of the support rod. Protective ladders are fixedly mounted on the surface of the support rod below the middle plate and the bottom plate. A protective escape hole is opened on the surface of the middle plate between the two elliptical rods. A handrail is movably arranged between the two elliptical rods. A connecting block is provided inside each of the two elliptical rods. Smooth rods are provided on both sides of the bottom end of each connecting block. A movable block is fitted onto the surface of each of the two smooth rods. A first groove is opened inside the movable block, and a through-hole is opened at the center of the surface of the movable block. The first groove has a crossbar movably mounted in the middle area. An inner sleeve is fitted inside the first groove and onto the surfaces of two smooth rods. An outer sleeve is movably mounted on the surface of the inner sleeve. Multiple metal balls are positioned inside the first groove, at the top of the inner sleeve and the bottom of the outer sleeve, and these metal balls contact the smooth rods. Fixed vertical rods are threaded through the left and right sides of the inner sleeve, with both ends of the fixed vertical rods fixedly connected to the inner surface of the movable block. Two movable gears are rotatably mounted on the surfaces of the two fixed vertical rods. Second meshing teeth are formed on the outer surface of the inner sleeve and the inner surface of the outer sleeve, and the outer sleeve and inner sleeve are movably connected via these second meshing teeth. The end of the crossbar is fixedly connected to the surface of the outer sleeve. First springs are positioned at the bottom of both sides of the crossbar, and these first springs press the crossbar upwards. The end of the handrail is inserted into the first groove through a through-slot and fixedly connected to the crossbar.

[0011] Preferably, the top end of the elliptical rod is provided with a top layer block, the top end of the connecting block is provided with two third tension springs, the top ends of the two third tension springs are fixedly connected to the top layer block, and the bottom end of the connecting block is provided with two first tension springs, the bottom ends of the two first tension springs are fixedly connected to the movable block.

[0012] Preferably, a second groove is provided on one side of the inner side of the connecting block, and a first gear is rotatably provided inside the second groove and on both the left and right sides of the connecting block. A first transmission disc is sleeved on the outer shaft of the first gear, and a second gear is provided at the center of the second groove.

[0013] Preferably, the second gear includes a left gear and a right gear, and a second transmission disc is sleeved on the outer shaft of the second gear. A chain is sleeved on the surface of the first transmission disc and the second transmission disc, and the first gear on the left side and the left gear on the right side are rotatably connected by the chain.

[0014] Preferably, two third grooves and one fourth groove are opened on the other side of the interior of the connecting block. The other end of the shaft of the first gear passes through the interior of the third groove and is fitted with a rotating disk. A curved rod is movably arranged inside the third groove. The outer end of the curved rod is in the shape of a barb and is connected to the rotating disk. A third spring is arranged below the outer end of the curved rod.

[0015] Preferably, both smooth rods have a long rod movably installed inside them. The top of the long rod is fitted with a second spring and a top cap. The top of the top cap has a pointed tip. The middle area of ​​the curved rod has a protruding plate. Below the protruding plate is a connecting frame. The hook at the tip of the pointed tip is connected to the connecting frame.

[0016] Preferably, the bottom ends of the two long rods extend to the bottom of the smooth rod and are fitted with bottom caps. A connecting rod is provided between the two bottom caps. First meshing teeth are provided on the inner surfaces of the left and right sides of the elliptical rod, and the first gear on its connecting block meshes with the first meshing teeth.

[0017] Preferably, the other end of the shaft of the right gear extends into the fourth groove and is fitted with an ear block. Friction blocks are provided on both the left and right sides of the ear block, and rectangular blocks are provided on the inner surfaces of the two friction blocks. Movable grooves are provided on the upper and lower sides of the two rectangular blocks.

[0018] Preferably, a limiting post is provided on both the left and right surfaces of the ear block, and the limiting post is stuck inside the movable groove. The friction block and the ear block are movably connected by a rectangular block, and two fourth tension springs are provided between the two friction blocks.

[0019] Preferably, a limiting block and a limiting ring are respectively provided on the inner surfaces of the upper and lower ends of the elliptical rod, and a second tension spring is provided at the top of the left and right sides of the outer sleeve, with the top of the second tension spring being fixedly connected to the inner surface of the movable block.

[0020] (III) Beneficial Effects

[0021] This invention provides a PLC-controlled intelligent tunnel excavation platform with automatic protection devices, which has the following advantages:

[0022] (1) By setting up protective escape holes, elliptical rods and handrails, the present invention enables workers to slide from the top of the excavation platform to the tunnel floor when a partial collapse occurs in the tunnel. This greatly improves the escape speed of the workers.

[0023] (2) The present invention, through the combination of a movable block, a handrail, a first tension spring, an outer sleeve, an inner sleeve, and a metal ball, so that after the worker grabs the handrail and pulls the crossbar down, the outer sleeve will move down and squeeze the metal ball below, and the inner sleeve will move up and squeeze the metal ball above under the action of the movable gear. In this way, the metal balls on the upper and lower sides will squeeze the smooth bar accordingly. At this time, when the operator grabs the handrail and slides down, there will be a certain resistance, thereby preventing the operator from falling directly to the ground.

[0024] (3) By setting up a connecting block, a first gear, a smooth rod, a rotating disk and a friction block, the present invention enables the connecting block to continue moving downward together with the smooth rod and the movable block when the handrail descends to the middle layer. At this time, the first gears on the left and right sides of the connecting block will contact the first meshing teeth on the inner surface of the elliptical rod. In this way, the first gear can actively decelerate and rotate through the action of the internal friction block to reduce the speed of the connecting block when it moves downward.

[0025] (4) By setting up structures such as PLC control box and protective ladder, when a collapse occurs in the tunnel, the module inside the PLC control box will disconnect the power supply to the entire platform after detecting a violent vibration, thereby reducing the probability of exposed wires coming into contact with the platform after it is squeezed and deformed. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the elliptical rod structure of the present invention;

[0028] Figure 3 This is a top sectional view of the elliptical rod of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the active block of the present invention;

[0030] Figure 5 This is a partial cross-sectional view of the active block of the present invention;

[0031] Figure 6 For the present invention Figure 5 Enlarged view of region A in the middle;

[0032] Figure 7 This is a cross-sectional view of the elliptical rod of the present invention;

[0033] Figure 8 This is a cross-sectional view of the second groove region inside the connecting block of the present invention;

[0034] Figure 9 This is a cross-sectional view of the third and fourth groove regions inside the connecting block of the present invention;

[0035] Figure 10 This is a top sectional view of the connecting block structure of the present invention.

[0036] In the diagram: 1. Support rod; 2. Bottom plate; 3. Middle plate; 4. Top plate; 5. Elliptical rod; 6. Safety ladder; 7. PLC control box; 8. Handrail; 9. Safety escape hole; 10. Smooth rod; 11. Movable block; 12. First tension spring; 13. Through slot; 14. Metal ball; 15. Fixed vertical rod; 16. Top plate block; 17. Outer sleeve; 18. Second tension spring; 19. Inner sleeve; 20. First slot; 21. First spring; 22. Crossbar; 23. Movable gear; 24. First gear; 25. First meshing tooth; 26. Connecting block; 27. Third tension spring; 28. Second... 29. Engaging teeth; 30. Limiting block; 31. Limiting ring; 32. Connecting rod; 33. Bottom cap; 34. First transmission disc; 35. Chain; 36. Second gear; 37. Second groove; 38. Rotating disc; 39. Protruding plate; 40. Bending rod; 41. Third groove; 42. Friction block; 43. Movable groove; 44. Ear block; 45. Sharp corner head; 46. Fourth tension spring; 47. Fourth groove; 48. Rectangular block; 49. Long rod; 50. Second spring; 51. Top cap; 52. Third spring; 53. Connecting frame; 3501. Left gear; 3502. Right gear. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1-10 As shown, the present invention provides a technical solution: a PLC-controlled intelligent tunnel excavation platform with an automatic protection device, including a support rod 1. The support rod 1 is made of metal and has a strong load-bearing capacity.

[0039] The support rod 1 is fixedly mounted with a top plate 4, a middle plate 3, and a bottom plate 2 from top to bottom. The bottom plate 2, the middle plate 3, and the top plate 4 are all welded to the support rod 1. Two elliptical rods 5 are set between the top plate 4 and the middle plate 3, and the top plate 4 and the middle plate 3 are fixedly connected by the elliptical rods 5. A PLC control box 7 is fixedly mounted on the outer surface of the support rod 1. A protective ladder 6 is fixedly mounted on the surface of the support rod 1 and below the middle plate 3 and the bottom plate 2. A protective escape hole 9 is opened on the surface of the middle plate 3 between the two elliptical rods 5. A handrail 8 is movably set between the two elliptical rods 5. The PLC control box 7 has a vibration detection module inside. When there is a local collapse in the tunnel, the PLC control box 7 will sense the vibration and cut off the power supply on the platform.

[0040] Both elliptical rods 5 have connecting blocks 26 inside. Smooth rods 10 are provided on both sides of the bottom end of each connecting block 26. Movable blocks 11 are fitted onto the surfaces of the two smooth rods 10, allowing them to move up and down. A first groove 20 is formed inside each movable block 11, and a through groove 13 is formed at the center of its surface. A crossbar 22 is movably installed in the middle area of ​​the first groove 20. Inner sleeves 19 are fitted inside the first groove 20 and onto the surfaces of both smooth rods 10. An outer sleeve 17 is movably fitted onto the surface of the inner sleeve 19. The first groove 20 is located between the top of the inner sleeve 19 and the outer sleeve 17. Multiple metal balls 14 are provided at the bottom of each sleeve. The metal balls 14 are in contact with the smooth rod 10. When the outer sleeve 17 moves downward, the inner sleeve 19 moves upward, and its end will squeeze the metal balls 14. In this way, the metal balls 14 will squeeze the smooth rod 10, thereby increasing the resistance of the movable block 11 on the smooth rod 10. Fixed vertical rods 15 are provided through the left and right sides of the inner side of the outer sleeve 17. The fixed vertical rods 15 are through the inner side of the outer sleeve 17, that is, the outer sleeve 17 can only move up and down and cannot rotate. Both ends of the fixed vertical rods 15 are fixedly connected to the inner surface of the movable block 11. The surfaces of the two fixed vertical rods 15 are rotatably set. There are two movable gears 23. The outer surface of the inner sleeve 19 and the inner surface of the outer sleeve 17 are both provided with second meshing teeth 28. The outer sleeve 17 and the inner sleeve 19 are movably connected through the second meshing teeth 28. If the outer sleeve 17 moves upward, the inner sleeve 19 will move downward. The end of the crossbar 22 is fixedly connected to the surface of the outer sleeve 17. The bottom ends of both sides of the crossbar 22 are provided with first springs 21, which press the crossbar 22 upward. The end of the handrail 8 is inserted into the first groove 20 through the through groove 13 and fixedly connected to the crossbar 22. Limiting blocks 29 are respectively provided on the inner surfaces of the upper and lower ends of the elliptical rod 5. The limiting ring 30 and the top of the left and right sides of the outer sleeve 17 are provided with a second tension spring 18. The top of the second tension spring 18 is fixedly connected to the inner surface of the movable block 11. The working principle of this part of the structure is that when the operator grabs the handrail 8, the handrail 8 will drive the crossbar 22 to move downward. The two ends of the crossbar 22 are connected to the outer sleeve 17. The outer sleeve 17 squeezes the metal ball 14 downward, thereby slowing down the downward speed of the movable block 11. Similarly, during the downward movement of the outer sleeve 17, it will drive the inner sleeve 19 to move upward under the action of the movable gear 23. The inner sleeve 19 will squeeze the metal ball 14 above.

[0041] The top of the elliptical rod 5 is provided with a top layer block 16, and the top of the connecting block 26 is provided with two third tension springs 27. The tops of the two third tension springs 27 are fixedly connected to the top layer block 16, and the third tension springs 27 provide an upward pulling force to the connecting block 26. In this way, when the connecting block 26 descends to the lowest point of the elliptical rod 5, it can return to its original position under the action of the third tension springs 27. The bottom of the connecting block 26 is provided with two first tension springs 12, and the bottoms of the two first tension springs 12 are fixedly connected to the movable block 11. The first tension springs 12 provide an upward pulling force to the movable block 11. That is, when the movable block 11 descends to the lowest point of the smooth rod 10, the first tension springs 12 can pull the movable block 11 back to its original position. A second groove 36 is opened on one side of the interior of the connecting block 26. The interior of the second groove 36 is located... A first gear 24 is rotatably mounted on both the left and right sides of the connecting block 26. A first transmission disc 33 is sleeved on the outer shaft of the first gear 24. A second gear 35 is located at the center of the second groove 36. The second gear 35 includes a left gear 3501 and a right gear 3502. A second transmission disc 37 is sleeved on the outer shaft of the second gear 35. A chain 34 is sleeved on the surface of the first transmission disc 33 and the second transmission disc 37. The first gear 24 on the left side is rotatably connected to the left gear 3501, and the first gear 24 on the right side is rotatably connected to the right gear 3502 through the chain 34. When the first gear 24 rotates, the chain 34 drives the second gear 35 to rotate. Similarly, the second gear 35 also restrains the first gear 24 from rotating. After being slowed down, the first gear 24 is also slowed down accordingly. Two third grooves 41 and one fourth groove 47 are opened on the other side of the connecting block 26. The other end of the shaft of the first gear 24 passes through the interior of the third groove 41 and is fitted with a rotating disk 38. A bent rod 40 is movably installed inside the third groove 41. The outer end of the bent rod 40 is in the shape of a barb and is connected to the rotating disk 38. Multiple teeth are evenly arranged on the surface of the rotating disk 38. The teeth on the left rotating disk 38 rotate clockwise, while the teeth on the right rotating disk 38 rotate counterclockwise. A third spring 52 is installed below the outer end of the bent rod 40. The third spring 52 compresses the end of the bent rod 40, thus ensuring that the barb at the end of the bent rod 40 is always in contact with the rotating disk. The teeth on the disc 38 are engaged. Long rods 49 are movably mounted inside both smooth rods 10. A second spring 50 and a top cap 51 are fitted at the top of each long rod 49. A pointed tip 45 is provided at the top of the top cap 51. A protruding plate 39 is provided in the middle area of ​​the curved rod 40. A connecting frame 53 is provided below the protruding plate 39. The hook at the top of the pointed tip 45 engages with the connecting frame 53. When the long rod 49 moves down, it can pull the curved rod 40, causing the barb at the end of the curved rod 40 to separate from the barb at the end of the rotating disc 38. The bottom ends of the two long rods 49 extend below the smooth rod 10 and are fitted with bottom caps 32. A connecting rod 31 is provided between the two bottom caps 32. First engagement teeth 25 are provided on the inner surfaces of both sides of the elliptical rod 5.The first gear 24 on the connecting block 26 meshes with the first meshing tooth 25. When the connecting block 26 moves up and down inside the elliptical rod 5, if the rotation speed of the first gear 24 is limited, the speed at which the connecting block 26 moves up and down inside the elliptical rod 5 will also decrease. The other end of the shaft of the right gear 3502 passes through the fourth groove 47 and is fitted with an ear block 44. Friction blocks 42 are provided on both the left and right sides of the ear block 44. Rectangular blocks 48 are provided on the inner surface of the two friction blocks 42. The upper and lower surfaces of the two rectangular blocks 48 are... Both sides are provided with movable grooves 43, and the left and right sides of the ear block 44 are provided with limiting posts, which are stuck inside the movable grooves 43. The friction block 42 and the ear block 44 are movably connected by a rectangular block 48. Two fourth tension springs 46 are provided between the two friction blocks 42. The working principle of this part of the structure is as follows: when the movable block 11 slides down the smooth rod 10 to the lowest point, the movable block 11 will first contact the bottom cap 32 and the connecting rod 31, and pull the bottom cap 32 down a certain distance. As the bottom cap 32 moves down, The long rod 49 connected to the bottom cap 32 will be pulled down, causing the outer end of the bent rod 40 to be pulled down, thus separating the barb on the bent rod 40 from the rotating disk 38. Once the barb on the bent rod 40 is separated from the rotating disk 38, the left rotating disk 38 can rotate clockwise, and the right rotating disk 38 can rotate counterclockwise. The first gear 24 connected to the rotating disk 38 is also released accordingly, that is, the first gear 24 can rotate freely. During the downward movement of the connecting block 26, the left first gear 24 can rotate clockwise, and the right first gear 24 can rotate counterclockwise. During the downward movement of the connecting block 26, the first gear 24 rotates at high speed and drives the second gear 35 to rotate at high speed through the chain 34. At this time, the ear block 44 coaxially connected to the right gear 3502 and the friction blocks 42 on both sides will also rotate at high speed. That is, the friction blocks 42 will contact the inner wall of the fourth groove 47 under the action of centrifugal force, thereby increasing its rotational resistance. In this way, the friction blocks 42 restrain and ultimately restrain the speed at which the connecting block 26 slides down inside the elliptical rod 5.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PLC-controlled intelligent tunnel excavation platform with automatic protection devices, comprising a support rod (1), characterized in that: The support rod (1) is fixedly mounted with a top plate (4), a middle plate (3) and a bottom plate (2) from top to bottom. Two elliptical rods (5) are provided between the top plate (4) and the middle plate (3). The top plate (4) and the middle plate (3) are fixedly connected by the elliptical rods (5). A PLC control box (7) is fixedly mounted on the outer surface of the support rod (1). Protective ladders (6) are fixedly mounted on the surface of the support rod (1) and below the middle plate (3) and the bottom plate (2). A protective escape hole (9) is opened on the surface of the middle plate (3) between the two elliptical rods (5). A handrail (8) is movably arranged between the two elliptical rods (5). A connecting block (26) is provided inside each of the two elliptical rods (5). Smooth rods (10) are provided on both sides of the bottom end of the connecting block (26). Movable blocks (11) are fitted on the surfaces of the two smooth rods (10). A first groove (20) is opened inside the movable block (11). A through groove (13) is opened at the center of the surface of the movable block (11). A crossbar (22) is movably arranged in the middle area of ​​the first groove (20). A handrail (22) is fitted inside the first groove (20) and on the surfaces of the two smooth rods (10). An inner sleeve (19) is provided, and an outer sleeve (17) is movably fitted onto the surface of the inner sleeve (19). Multiple metal balls (14) are provided inside the first groove (20) at the top of the inner sleeve (19) and the bottom of the outer sleeve (17). These metal balls (14) contact a smooth rod (10). Fixed vertical rods (15) are provided through the left and right sides of the interior of the outer sleeve (17). Both ends of the fixed vertical rods (15) are fixedly connected to the inner surface of the movable block (11). Two movable gears (23) are rotatably provided on the surfaces of the two fixed vertical rods (15). The inner sleeve (19)... The outer surface of 9) and the inner surface of the outer sleeve (17) are provided with second meshing teeth (28) that mesh with the movable gear (23). The outer sleeve (17) and the inner sleeve (19) are movably connected through the movable gear (23) and the second meshing teeth (28). The end of the crossbar (22) is fixedly connected to the surface of the outer sleeve (17). The bottom ends of both sides of the crossbar (22) are provided with first springs (21), which press the crossbar (22) upward. The end of the handrail (8) is inserted into the first groove (20) through the through groove (13) and fixedly connected to the crossbar (22).

2. The intelligent tunnel excavation platform with automatic protection device based on PLC control according to claim 1, characterized in that: The top of the elliptical rod (5) is provided with a top layer block (16), and the top of the connecting block (26) is provided with two third tension springs (27). The tops of the two third tension springs (27) are fixedly connected to the top layer block (16). The bottom of the connecting block (26) is provided with two first tension springs (12). The bottoms of the two first tension springs (12) are fixedly connected to the movable block (11).

3. The intelligent tunnel excavation platform with automatic protection device based on PLC control according to claim 2, characterized in that: The connecting block (26) has a second groove (36) on one side inside. The second groove (36) is rotatably provided on both the left and right sides of the connecting block (26). The first transmission disc (33) is sleeved on the outer shaft of the first gear (24). The second gear (35) is provided at the center of the second groove (36).

4. The intelligent tunnel excavation platform with automatic protection device based on PLC control according to claim 3, characterized in that: The second gear (35) includes a left gear (3501) and a right gear (3502). A second transmission disc (37) is sleeved on the outer shaft of the second gear (35). A chain (34) is sleeved on the surface of the first transmission disc (33) and the second transmission disc (37). The first gear (24) on the left side is rotatably connected to the left gear (3501), and the first gear (24) on the right side is rotatably connected to the right gear (3502) through the chain (34).

5. A PLC-controlled intelligent tunnel excavation platform with automatic protection device as described in claim 4, characterized in that: Two third grooves (41) and a fourth groove (47) are opened on the other side of the interior of the connecting block (26). The other end of the shaft of the first gear (24) passes through the interior of the third groove (41) and is fitted with a rotating disk (38). A bent rod (40) is movably arranged inside the third groove (41). The outer end of the bent rod (40) is in the shape of a barb and is connected to the rotating disk (38). A third spring (52) is arranged below the outer end of the bent rod (40).

6. The intelligent tunnel excavation platform with automatic protection device based on PLC control according to claim 5, characterized in that: Both of the smooth rods (10) have a long rod (49) movably installed inside. The top of the long rod (49) is fitted with a second spring (50) and a top cap (51). The top of the top cap (51) is provided with a pointed head (45). The middle area of ​​the curved rod (40) is provided with a protruding plate (39). A connecting frame (53) is provided below the protruding plate (39). The hook at the top of the pointed head (45) is connected to the connecting frame (53).

7. A PLC-controlled intelligent tunnel excavation platform with automatic protection device as described in claim 6, characterized in that: The bottom ends of the two long rods (49) extend to the bottom of the smooth rod (10) and are fitted with bottom caps (32). A connecting rod (31) is provided between the two bottom caps (32). First meshing teeth (25) are provided on the inner surfaces of the left and right sides of the elliptical rod (5). The first gear (24) on its connecting block (26) meshes with the first meshing teeth (25).

8. A PLC-controlled intelligent tunnel excavation platform with automatic protection device according to claim 7, characterized in that: The other end of the shaft of the right gear (3502) passes through the fourth groove (47) and is fitted with an ear block (44). Friction blocks (42) are provided on both the left and right sides of the ear block (44). Rectangular blocks (48) are provided on the inner surface of the two friction blocks (42). Movable grooves (43) are provided on the upper and lower sides of the two rectangular blocks (48).

9. A PLC-controlled intelligent tunnel excavation platform with automatic protection device as described in claim 8, characterized in that: Limiting posts are provided on both the left and right sides of the ear block (44), and the limiting posts are locked inside the movable groove (43). The friction block (42) and the ear block (44) are movably connected by a rectangular block (48). Two fourth tension springs (46) are provided between the two friction blocks (42).

10. A PLC-controlled intelligent tunnel excavation platform with automatic protection device according to claim 1, characterized in that: Limiting blocks (29) and limiting rings (30) are respectively provided on the inner surfaces of the upper and lower ends of the elliptical rod (5). Second tension springs (18) are provided at the top ends of the left and right sides of the outer sleeve (17), and the top ends of the second tension springs (18) are fixedly connected to the inner surface of the movable block (11).

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