Landslide early warning extensometer with strong anti-interference performance

Abstract

The invention relates to the technical field of geological monitoring and early warning, in particular to a landslide early-warning extensometer with high anti-interference performance, and provides the following scheme aiming at the problems of poor anti-interference capability and poor stability of an early-warning extensometer in the prior art: the landslide early-warning extensometer comprises a first mounting frame, a second mounting frame, a third mounting frame and a fourth mounting frame, an extensometer body is mounted on the top surface of the top plate, and the extensometer body comprises a case mounted on the top surface of the top plate and a loudspeaker mounted on the top of the case; the second mounting frame comprises a connecting plate and a plurality of second inserting rods fixed to the bottom face of the connecting plate, and one end of the steel ruler stretching out of the machine box is fixed to the connecting plate through a first fixing plate. According to the device, the extensometer can be well protected, the protective cover can be opened in time when the size of a crack exceeds a safety value, and meanwhile, the second mounting frame can be gradually reinforced when the crack is enlarged.

Description

Technical Field

[0001] The invention relates to the field of geological monitoring and early warning, and in particular to a landslide early warning extensometer with strong anti-interference performance. Background Art

[0002] At present, landslide early warning extensometers are often used in the process of monitoring slope geological disasters. The main working principle of the landslide early warning extensometer is to monitor the changes in slope cracks. The extensometer is installed on one side of the slope cracks, and then a fixed frame is installed on the other side of the cracks. Then the steel ruler in the extensometer is set to a safe length, and then one end of the steel ruler is fixed on the fixed frame. When the size of the crack increases, the steel ruler will be lengthened. When it exceeds the safe length set by the steel ruler, it means that the length of the crack exceeds the safety value. Then the speaker of the extensometer will sound an alarm to remind.

[0003] Most of the existing landslide early warning extensometers are installed on the slopes in the open air and have poor anti-interference ability. Long-term exposure to wind, sun and rain will cause certain damage to the extensometers, resulting in their malfunction. Moreover, as the cracks in the slopes increase, the soil will become loose, which can easily cause the mounting frame used to install the extensometer to become loose, thereby affecting the monitoring results. Therefore, this scheme proposes a landslide early warning extensometer with strong anti-interference performance. Summary of the invention

[0004] The invention provides a landslide early warning extensometer with strong anti-interference performance, which solves the problems of poor anti-interference ability and lack of stability of the early warning extensometer in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A landslide early warning extensometer with strong anti-interference performance, comprising:

[0007] A first mounting frame, comprising a top plate and a plurality of first plugging rods fixed to the bottom surface of the top plate, a telescope body being mounted on the top surface of the top plate, the telescope body comprising a chassis mounted on the top surface of the top plate and a speaker mounted on the top of the chassis;

[0008] The second mounting frame comprises a connecting plate and a plurality of second plug rods fixed to the bottom surface of the connecting plate, one end of the steel ruler stretched out from the chassis is fixed to the connecting plate through the first fixing plate, a second mounting plate is fixed between the plurality of second plug rods, a third screw rod arranged along the length direction of the second plug rod is threadedly connected to the second mounting plate, a fixing sleeve movable along its axial direction is movably sleeved on the outer periphery of the third screw rod, and the bottom of the fixing sleeve is rotatably connected to the top surface of the second mounting plate, a first rope wheel is sleeved on the outer periphery of the fixing sleeve, a first pull rope is wound around the outer periphery of the first rope wheel, and the other end of the first pull rope is fixedly connected to the top plate through the second fixing plate;

[0009] The protection mechanism includes a protection cover arranged outside the machine telescopic instrument and a locking piece installed on the top surface of the top plate, one side of the protection cover is connected to the top surface of the top plate through a reset piece, a wire groove for the steel ruler to pass through is provided on the side of the protection cover facing the reset piece, and the side of the protection cover is engaged with the locking piece;

[0010] The adjusting mechanism is installed between the first mounting frame and the second mounting frame and is used for unlocking the locking piece to open the protective cover when the stretched length of the steel ruler exceeds a set value.

[0011] Through the above technical solution, not only can the extensometer be well protected, but the protective cover can also be opened in time when the crack size exceeds the safety value, and the second mounting frame can be gradually reinforced as the crack increases.

[0012] As a further improvement of the above scheme, the reset member includes two fixed blocks fixed on the top surface of the top plate and a rotating shaft arranged between the two fixed blocks, mounting holes are opened on the opposite sides of the two fixed blocks, both ends of the rotating shaft extend into the two mounting holes respectively and are rotatably connected thereto, a torsion spring is installed between one end of the rotating shaft located in the mounting hole and the mounting hole, and the rotating shaft is fixed to the bottom of one side of the protective cover.

[0013] Through the above technical solution, the protective cover can be automatically opened after the locking member contacts and locks.

[0014] As a further improvement of the above scheme, the locking member includes an adjustment plate slidably connected to the top surface of the top plate and a plurality of clips installed on the outer wall of the adjustment plate on one side close to the protective cover, and a plurality of storage grooves for installing the clips are opened on the outer wall of the adjustment plate on one side close to the protective cover, and the clips include an elastic column movably arranged in the storage groove and a spring fixed at one end of the elastic column, the other end of the spring is fixed on the inner wall of the storage groove, the other end of the elastic column is a right-angled triangle structure and extends to the outside of the storage groove, and the inclined surface of the elastic column is arranged upward, and a clip hole matching the elastic column is opened on the outer wall of the protective cover on the side where the wire groove is opened.

[0015] Through the above technical solution, the closed protective cover can be conveniently locked.

[0016] As a further improvement of the above scheme, the adjusting mechanism includes a fixed shaft rotatably connected to the top plate, a second rope pulley fixed to the top of the fixed shaft, a second screw rod installed on the bottom surface of the top plate and a movable plate threadedly sleeved on the outer periphery of the second screw rod, the top surface of the top plate is provided with a connecting groove arranged along the length direction of the second screw rod, the top of the movable plate passes through the connecting groove and is fixedly connected to the bottom surface of the adjusting plate, one end of the second screw rod is transmission-connected to the bottom of the fixed shaft, a second pull rope is wound around the outer periphery of the second rope pulley, and the other end of the second pull rope is fixed to the first fixed plate.

[0017] Through the above technical solution, when the size of the crack exceeds the safety value, the lifting mechanism can be automatically driven to release the lock of the locking piece, thereby opening the protective cover.

[0018] As a further improvement of the above solution, the two long sides of the movable plate are respectively abutted against the two long sides of the connecting groove, and the length of the adjusting plate is greater than the width of the connecting groove.

[0019] The above technical solution can prevent the movable plate from shaking when moving in the connecting groove.

[0020] As a further improvement of the above solution, a reinforcement mechanism is installed on the bottom surface of the top plate, and the reinforcement mechanism is transmission-connected to the second screw rod via a transmission shaft.

[0021] Through the above technical solution, the first mounting frame can be automatically reinforced while the second screw rod rotates.

[0022] As a further improvement of the above scheme, the reinforcement mechanism includes a first mounting plate fixed between multiple first insertion rods, a first screw threadedly connected to the first mounting plate, and a fixed cylinder rotatably connected to the bottom surface of the top plate, the top of the first screw extends into the fixed cylinder, and a limiting block is fixed on the outer periphery of one end of the first screw located in the fixed cylinder, a limiting groove arranged along its axial direction is opened on the inner wall of the fixed cylinder, one end of the limiting block extends into the limiting groove and is slidably connected to the limiting groove, and one end of the transmission shaft is transmission-connected to the fixed cylinder.

[0023] Through the above technical solution, the first screw rod can be driven to descend while rotating by the rotation of the transmission shaft.

[0024] As a further improvement of the above solution, a sliding groove is provided on the outer periphery of the third screw rod along its axial direction, a sliding block is fixed on the inner wall of the fixed sleeve, and one end of the sliding block extends into the sliding groove and is slidably connected thereto.

[0025] The above technical solution ensures that the third screw can move downward while rotating.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Through the cooperation among the first mounting frame, the second mounting frame, the second mounting plate, the third screw, the fixing sleeve, the first rope pulley and the first pull rope, the third screw can be driven to rotate while the distance between the first mounting frame and the second mounting frame increases, so that the third screw descends while rotating, and the third screw is inserted deep into the soil, so that the second fixing frame can be more stable, thereby ensuring the normal operation of the telescopic instrument and solving the problem of its poor stability.

[0028] 2. Through the cooperation between the protective mechanism and the adjusting mechanism, the protective cover can be automatically opened when the steel ruler is stretched beyond the limit value, so that the alarm sound emitted by the speaker will not be covered. Under normal circumstances, the protective cover is in a closed state, which can protect the telescope from wind and rain, help ensure that it can work normally for a long time, and solve the problem of its poor anti-interference ability.

[0029] 3. Through the cooperation between the reinforcement mechanism and the adjustment mechanism, the first screw rod can be driven to be inserted deep into the soil when the distance between the first fixing frame and the second fixing frame increases, thereby effectively ensuring the stability of the first mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front cross-sectional view of the present invention;

[0031] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0032] Figure 3 It is a schematic diagram of the structure when the protective cover is closed;

[0033] Figure 4 This is a schematic diagram of the structure when the protective cover is opened;

[0034] Figure 5 It is a schematic diagram of the structure of the fixed cylinder and the first screw.

[0035] Description of main symbols:

[0036] 1. Top plate; 2. First plug rod; 3. Protective cover; 4. Rotating shaft; 5. Chassis; 6. Speaker; 7. Steel ruler; 8. First pull rope; 9. Second pull rope; 10. First mounting plate; 11. First screw rod; 12. Fixed cylinder; 13. Transmission shaft; 14. Second screw rod; 15. First fixed plate; 16. Connecting plate; 17. Slide groove; 18. Second plug rod; 19. Second mounting plate; 20. Fixed sleeve; 21. First rope pulley; 22. Second fixed plate; 23. Connecting groove; 24. Adjusting plate; 25. Receiving groove; 26. Elastic column; 27. Moving plate; 28. Fixed shaft; 29. ​​Second rope pulley; 30. Wire groove; 31. Fixed block; 32. Clamp hole; 33. Limiting groove; 34. Limiting block; 35. Third screw rod. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0038] Embodiment 1:

[0039] Please combine Figure 1 , a landslide early warning expansion instrument with strong anti-interference performance in this embodiment includes:

[0040] The first mounting frame includes a top plate 1 and a plurality of first plug rods 2 fixed on the bottom surface of the top plate 1. The top surface of the top plate 1 is provided with a telescope body. The telescope body includes a chassis 5 installed on the top surface of the top plate 1 and a speaker 6 installed on the top of the chassis 5. A steel ruler 7 is provided on the chassis 5. By setting a safe length of the steel ruler 7, when the stretching length of the steel ruler 7 exceeds the set value, the speaker 6 starts to alarm, indicating that the width of the crack on the landslide exceeds the safe value.

[0041] The second mounting frame includes a connecting plate 16 and a plurality of second plug rods 18 fixed to the bottom surface of the connecting plate 16. One end of the steel ruler 7 stretched out of the chassis 5 is fixed to the connecting plate 16 through the first fixing plate 15. A plurality of fixing rings are fixed to the first fixing plate 15. When installing the extensometer, the first mounting frame and the second mounting frame are respectively installed on both sides of the gap on the slope, and then one end of the steel ruler 7 is tied to a fixing ring on the connecting plate 16. When the gap becomes larger, the steel ruler 7 will stretch out from the inside of the chassis 5. When the stretching length of the steel ruler 7 exceeds the set value, the speaker 6 starts to alarm.

[0042] A second mounting plate 19 is fixed between the plurality of second plug rods 18, a third screw rod 35 arranged along the length direction of the second plug rod 18 is threadedly connected to the second mounting plate 19, a fixed sleeve 20 movable along its axial direction is movably sleeved on the outer periphery of the third screw rod 35, and the bottom of the fixed sleeve 20 is rotatably connected to the top surface of the second mounting plate 19, a first rope wheel 21 is sleeved on the outer periphery of the fixed sleeve 20, a first pull rope 8 is wound around the outer periphery of the first rope wheel 21, and the other end of the first pull rope 8 is fixedly connected to the top plate 1 through the second fixed plate 22, a slide groove 17 arranged along its axial direction is opened on the outer periphery of the third screw rod 35, a slider is fixed on the inner wall of the fixed sleeve 20, one end of the slider extends into the slide groove 17 and slides therewith, when When the crack in the slope becomes larger, the distance between the first mounting frame and the second mounting frame becomes larger. At this time, the first pull rope 8 is unfolded from the first rope wheel 21 under the action of tension, thereby driving the first rope wheel 21 to rotate. The rotation of the first rope wheel 21 drives the fixing sleeve 20 to rotate at the same time. The rotation of the fixing sleeve 20 drives the third screw 35 to rotate, and the third screw 35 is threadedly connected to the second mounting plate 19, so that the third screw 35 moves downward while rotating, and can be inserted deep into the soil, so that the second mounting frame is more firmly fixed on the slope when the crack in the slope becomes larger, effectively avoiding the loosening of the second mounting frame due to changes in the soil layer caused by the enlargement of the crack, thereby ensuring that the telescopic instrument can work normally.

[0043] The protective mechanism comprises a protective cover 3 arranged on the outside of the machine telescopic instrument and a locking piece installed on the top surface of the top plate 1. One side of the protective cover 3 is connected to the top surface of the top plate 1 through a reset piece. A wire groove 30 for the steel ruler 7 to pass through is provided on the side of the protective cover 3 facing the reset piece, and this side of the protective cover 3 is clamped with the locking piece. The reset piece comprises two fixed blocks 31 fixed on the top surface of the top plate 1 and a rotating shaft 4 arranged between the two fixed blocks 31. Mounting holes are provided on the opposite sides of the two fixed blocks 31. Both ends of the rotating shaft 4 extend into the two mounting holes respectively and are rotatably connected thereto. A torsion spring is installed between one end of the rotating shaft 4 located in the mounting hole and the mounting hole. The rotating shaft 4 is fixed to the bottom of one side of the protective cover 3. The locking piece comprises an adjusting plate 24 slidably connected to the top surface of the top plate 1 and a plurality of clamping pieces installed on the outer wall of the adjusting plate 24 on one side close to the protective cover 3. A plurality of clamping pieces for mounting are provided on the outer wall of the adjusting plate 24 on one side close to the protective cover 3. The receiving slot 25 of the connecting piece, the card connector includes an elastic column 26 movably arranged in the receiving slot 25 and a spring fixed at one end of the elastic column 26, the other end of the spring is fixed on the inner wall of the receiving slot 25, the other end of the elastic column 26 is a right-angled triangle structure and extends to the outside of the receiving slot 25, and the inclined surface of the elastic column 26 is arranged upward, and a card hole 32 that matches the elastic column 26 is provided on the outer wall of one side of the protective cover 3 with the wire groove 30. When the protective cover 3 is closed, it can protect the telescope and prevent it from being exposed to wind, sun and rain, thereby effectively extending its service life. When the protective cover 3 is closed, the torsion spring is in a compressed state, one end of the elastic column 26 is carded in the card hole 32, and the spring is also in a compressed state. When the elastic column 26 withdraws from the card hole 32, the protective cover 3 will automatically pop open under the action of the torsion spring, so that the alarm sound emitted by the speaker 6 will not be covered by the protective cover 3.

[0044] The adjusting mechanism is installed between the first mounting frame and the second mounting frame, and is used to unlock the locking piece to open the protective cover 3 when the stretching length of the steel ruler 7 exceeds the set value. The adjusting mechanism includes a fixed shaft 28 rotatably connected to the top plate 1, a second rope pulley 29 fixed to the top of the fixed shaft 28, a second screw rod 14 installed on the bottom surface of the top plate 1, and a movable plate 27 threadedly sleeved on the outer periphery of the second screw rod 14. The top surface of the top plate 1 is provided with a connecting groove 23 arranged along the length direction of the second screw rod 14. The top of the movable plate 27 passes through the connecting groove 23 and is fixedly connected to the bottom surface of the adjusting plate 24. The long sides of the two sides of the movable plate 27 are respectively abutted against the long sides of the two sides of the connecting groove 23. The length of the adjusting plate 24 is greater than the width of the connecting groove 23. A first driven bevel gear is fixed to one end of the second screw rod 14, and a first active bevel gear meshing with the first driven bevel gear is fixed to the bottom of the fixed shaft 28. A second pull rope 9 is wound around the outer periphery of the second rope pulley 29, and the other end of the second pull rope 9 is fixed at the first On the fixing plate 15, a fixing ring is also fixed on the first fixing plate 15 for fixing the second pull rope 9. When the distance between the first mounting frame and the second mounting frame becomes larger, the second pull rope 9 is pulled. When the second pull rope 9 is pulled, the second pull rope 9 drives the second rope wheel 29 to rotate. After the second rope wheel 29 rotates, it drives the second screw 14 to rotate. After the second screw 14 rotates, it can drive the movable plate 27 to move to the side away from the protective cover 3. When the movable plate 27 moves, it drives the adjustment plate 24 to move synchronously. Since the spring has a deformation process, the elastic column 26 of the adjustment plate 24 will not immediately follow its synchronous movement after the adjustment plate 24 moves, but moves with the movement of the adjustment plate 24 after the spring completely recovers its deformation. Therefore, when the size of the crack does not exceed the safety value, the elastic column 26 will not withdraw from the card hole 32, so that the protective cover 3 will not be opened when the size of the crack does not reach the set value.

[0045] The implementation principle of this embodiment is as follows: when installing the extensometer, the first mounting frame and the second mounting frame are respectively mounted on both sides of the gap on the slope, and then the safety length of the steel ruler 7 is set, and then one end of the steel ruler 7 is tied to a fixing ring on the connection 16, and then the protective cover 3 is closed and locked with a locking piece;

[0046] When the gap becomes larger, the steel ruler 7 will stretch outward from the inside of the chassis 5, and the distance between the first mounting bracket and the second mounting bracket will also increase accordingly. When the stretching length of the steel ruler 7 exceeds the set value, the speaker 6 starts to alarm;

[0047] When the distance between the first mounting frame and the second mounting frame increases, the first pull rope 8 is unrolled from the first rope wheel 21 under the action of the tension, thereby driving the first rope wheel 21 to rotate. The rotation of the first rope wheel 21 drives the fixing sleeve 20 to rotate. The rotation of the fixing sleeve 20 drives the third screw rod 35 to rotate. The third screw rod 35 is threadedly connected to the second mounting plate 19, so that the third screw rod 35 moves downward while rotating, and can be inserted into the depth of the soil, so that the second mounting frame is more firmly fixed on the slope when the cracks in the slope become larger.

[0048] At the same time, the second pull rope 9 will also drive the second rope wheel 29 to rotate. After the second rope wheel 29 rotates, it will drive the second screw 14 to rotate. After the second screw 14 rotates, it can drive the movable plate 27 to move to the side away from the protective cover 3. When the end of the elastic column 26 located in the card hole 32 is completely withdrawn to the outside of the card hole, the protective cover 3 will be bounced open under the action of the torsion spring.

[0049] Embodiment 2:

[0050] Combination Figure 1 , Figure 2 and Figure 5 The present embodiment is further improved on the basis of the embodiment 1 in that: a reinforcing mechanism is installed on the bottom surface of the top plate 1, and the reinforcing mechanism is connected to the second screw rod 14 through the transmission shaft 13. The reinforcing mechanism includes a first mounting plate 10 fixed between the plurality of first insertion rods 2, a first screw rod 11 threadedly connected to the first mounting plate 10, and a fixing cylinder 12 rotatably connected to the bottom surface of the top plate 1. The top of the first screw rod 11 extends into the fixing cylinder 12, and a limiting block 34 is fixed on the outer periphery of one end of the first screw rod 11 located in the fixing cylinder 12. The inner periphery of the fixing cylinder 12 is fixed with a limiting block 34. A limiting groove 33 is provided on the wall along its axial direction, one end of the limiting block 34 extends into the limiting groove 33 and is slidably connected thereto, the transmission shaft 13 is mounted on the bottom surface of the top plate 1, and one end of the transmission shaft 13 is fixedly connected to the other end of the second screw 14, a second active bevel gear is fixed to the other end of the transmission shaft 13, a second driven bevel gear meshing with the first active bevel gear is sleeved on the outer periphery of the fixed cylinder 12, and the fixed cylinder 12 will drive the first screw 11 to rotate synchronously when rotating, and the first screw 11 will drop relative to the first mounting plate 10 after rotating.

[0051] The implementation principle of this embodiment is: when the second screw rod 14 rotates, it will drive the transmission shaft 13 to rotate synchronously, and when the transmission shaft 13 rotates, it will drive the fixed cylinder 12 to rotate. When the fixed cylinder 12 rotates, it drives the second screw rod 14 to rotate. While the second screw rod 14 rotates, it will descend relative to the first mounting plate 10. Therefore, when the cracks in the slope become larger, the second screw rod 14 will be inserted deeper into the soil, so that the first mounting frame can be more firmly fixed on the slope.

[0052] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A landslide early warning extensometer with strong anti-interference performance, characterized in that: include: A first mounting frame, comprising a top plate and a plurality of first plugging rods fixed to the bottom surface of the top plate, a telescope body being mounted on the top surface of the top plate, the telescope body comprising a chassis mounted on the top surface of the top plate and a speaker mounted on the top of the chassis; The second mounting frame comprises a connecting plate and a plurality of second plug rods fixed to the bottom surface of the connecting plate, one end of the steel ruler stretched out from the chassis is fixed to the connecting plate through the first fixing plate, a second mounting plate is fixed between the plurality of second plug rods, a third screw rod arranged along the length direction of the second plug rod is threadedly connected to the second mounting plate, a fixing sleeve movable along its axial direction is movably sleeved on the outer periphery of the third screw rod, and the bottom of the fixing sleeve is rotatably connected to the top surface of the second mounting plate, a first rope wheel is sleeved on the outer periphery of the fixing sleeve, a first pull rope is wound around the outer periphery of the first rope wheel, and the other end of the first pull rope is fixedly connected to the top plate through the second fixing plate; The protection mechanism includes a protection cover arranged outside the machine telescopic instrument and a locking piece installed on the top surface of the top plate, one side of the protection cover is connected to the top surface of the top plate through a reset piece, a wire groove for the steel ruler to pass through is provided on the side of the protection cover facing the reset piece, and the side of the protection cover is engaged with the locking piece; The adjusting mechanism is installed between the first mounting frame and the second mounting frame and is used for unlocking the locking piece to open the protective cover when the stretched length of the steel ruler exceeds a set value.

2. A landslide early warning extensometer with strong anti-interference performance according to claim 1, characterized in that: The reset member includes two fixed blocks fixed on the top surface of the top plate and a rotating shaft arranged between the two fixed blocks. Mounting holes are opened on the opposite sides of the two fixed blocks. Both ends of the rotating shaft extend into the two mounting holes respectively and are rotatably connected thereto. A torsion spring is installed between one end of the rotating shaft located in the mounting hole and the mounting hole. The rotating shaft is fixed to the bottom of one side of the protective cover.

3. The landslide early warning extensometer with strong anti-interference performance according to claim 1 is characterized in that: The locking member includes an adjustment plate slidably connected to the top surface of the top plate and a plurality of clips installed on the outer wall of the adjustment plate on one side close to the protective cover. A plurality of receiving grooves for installing the clips are provided on the outer wall of the adjustment plate on one side close to the protective cover. The clips include an elastic column movably arranged in the receiving groove and a spring fixed to one end of the elastic column, the other end of the spring is fixed to the inner wall of the receiving groove, the other end of the elastic column is a right-angled triangle structure and extends to the outside of the receiving groove, and the inclined surface of the elastic column is arranged upward, and a clip hole matching the elastic column is provided on the outer wall of the protective cover on the side where the wire groove is provided.

4. The landslide early warning extensometer with strong anti-interference performance according to claim 1, characterized in that: The adjusting mechanism includes a fixed shaft rotatably connected to a top plate, a second rope pulley fixed to the top of the fixed shaft, a second screw rod installed on the bottom surface of the top plate, and a movable plate threadedly sleeved on the outer periphery of the second screw rod, the top surface of the top plate is provided with a connecting groove arranged along the length direction of the second screw rod, the top of the movable plate passes through the connecting groove and is fixedly connected to the bottom surface of the adjusting plate, one end of the second screw rod is transmission-connected to the bottom of the fixed shaft, a second pull rope is wound around the outer periphery of the second rope pulley, and the other end of the second pull rope is fixed to the first fixed plate.

5. The landslide early warning extensometer with strong anti-interference performance according to claim 4, characterized in that: The two long sides of the movable plate are respectively in contact with the two long sides of the connecting groove, and the length of the adjusting plate is greater than the width of the connecting groove.

6. The landslide early warning extensometer with strong anti-interference performance according to claim 4, characterized in that: A reinforcement mechanism is installed on the bottom surface of the top plate, and the reinforcement mechanism is transmission-connected to the second screw rod through a transmission shaft.

7. The landslide early warning extensometer with strong anti-interference performance according to claim 8, characterized in that: The reinforcement mechanism includes a first mounting plate fixed between multiple first insertion rods, a first screw threadedly connected to the first mounting plate, and a fixed cylinder rotatably connected to the bottom surface of the top plate, the top of the first screw extends into the fixed cylinder, the outer periphery of one end of the first screw located in the fixed cylinder is fixed with a limiting block, the inner wall of the fixed cylinder is provided with a limiting groove arranged along its axial direction, one end of the limiting block extends into the limiting groove and is slidably connected thereto, and one end of the transmission shaft is transmission-connected to the fixed cylinder.

8. The landslide early warning extensometer with strong anti-interference performance according to claim 1, characterized in that: The outer periphery of the third screw rod is provided with a sliding groove arranged along the axial direction thereof, and a sliding block is fixed on the inner wall of the fixed sleeve, and one end of the sliding block extends into the sliding groove and is slidably connected therewith.

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