Steel rope deformation monitoring device
By designing a steel rope deformation monitoring device including a cover and a distance measuring device, the problem that traditional equipment cannot effectively monitor the deformation of steel strands is solved, and high-precision deformation measurement and device stability are achieved.
Patent Information
- Application Number
- CN202411510419.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-07-15
- Filing Date
- 2024-10-28
- Publication Date
- 2025-03-07
AI Technical Summary
Traditional stress tension testing equipment cannot effectively monitor the deformation of steel strands, and the measurement accuracy is not high, it is susceptible to external interference, and the equipment is easily damaged.
A steel rope deformation monitoring device is designed, including a steel rope, a hollow cylindrical shell and a distance measuring device. The cover consists of an inner shell and an outer shell, which can move left and right to side. The distance measuring device is installed between the inner shell and the outer shell, and the steel strand is deformed and amplified by gear set transmission for easy measurement.
It improves the accuracy of measurement, avoids damage to the distance measuring instrument, and is easy to install, is not limited by the cable/stranded wire structure, and has high distance measuring accuracy.
Smart Images
Figure CN119573586A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of stress tensioning tests, and in particular to a steel rope deformation monitoring device. Background Art
[0002] Steel cables and steel strands are widely used prestressed components. They are widely used in the design and construction of building projects and can well meet the requirements of different scenarios. In order to ensure the application effect of steel strands, it is necessary to conduct a comprehensive analysis of their mechanical properties and take targeted treatment measures based on the analysis results. However, since the surface of steel cables and steel strands is uneven and cannot be polished smooth, traditional strain gauges and vibrating wire strain gauges cannot be installed and fitted. At the same time, the measurement accuracy of traditional displacement meters is at the mm level, which is difficult to meet the monitoring accuracy requirements.
[0003] In traditional tension force measurement, the elongation of the strand is determined by detecting the difference between the extension of the jack piston and the retraction of the tool clip. This is time-consuming and labor-intensive, and the test results are not accurate. At the same time, the distance measuring instrument is exposed to the outside and is easily disturbed by external factors (such as wind) and easily damaged. Summary of the invention
[0004] The object of the present invention is to provide a steel rope deformation monitoring device to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel rope deformation monitoring device, characterized in that it includes a steel rope, a hollow cylindrical cover shell, and a distance measuring device. The cover shell includes an outer shell located on the left, an inner shell on the right, a first cover, a second cover, a first fixing ring, and a second fixing ring. The first cover, the second cover, the first fixing ring, and the second fixing ring are all annular and have the same inner diameter. The inner shell and the outer shell are both double-layer cylindrical structures. The center lines of the inner cylinder of the inner shell, the outer cylinder of the inner shell, the inner cylinder of the outer shell, the outer cylinder of the outer shell, the first cover, the second cover, the first fixing ring, and the second fixing ring are on the same straight line. The inner shell and the outer shell are sleeved. The inner shell and the outer shell are assembled together, from the inside to the outside, they are the inner layer of the inner shell, the inner layer of the outer shell, the outer layer of the inner shell, and the outer layer of the outer shell. The inner layer and the outer layer of the inner shell are both fixedly connected to the left side of the first cover, the first fixing ring is fixedly connected to the right side of the first cover, the inner layer and the outer layer of the outer shell are both fixedly connected to the right side of the second cover, and the second fixing ring is fixedly connected to the left side of the second cover. The cover shell is mounted on the steel rope through the first fixing ring and the second fixing ring. The first fixing ring and the second fixing ring are fixedly connected to the steel rope. The inner shell and the outer shell can be displaced left and right relative to each other. A distance measuring device for measuring the degree of mutual displacement between the inner shell and the outer shell is installed in the outer shell, and the other part is installed in the inner shell.
[0006] Preferably: the outer ring at the left end of the outer layer of the inner shell is provided with a first annular limiting pin, the height of the first limiting pin is smaller than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell, the inner ring at the right end of the outer layer of the outer shell is provided with a second annular limiting pin, the height of the second limiting pin is slightly smaller than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell, and the sum of the heights of the first limiting pin and the second limiting pin is greater than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell.
[0007] Preferably: the inner shell inner layer, the inner shell outer layer, the first cover, the first fixing ring, the outer shell inner layer, the outer shell outer layer, the second cover and the second fixing ring are all composed of an upper half and a lower half, and the upper half and the lower half are mirror-symmetrical.
[0008] Preferably: a vertical columnar limit pin is fixedly installed on the outer side of the left end of the top surface of the upper half of the inner layer of the inner shell, and an L-shaped groove is provided on the upper half of the inner layer of the outer shell, the L-shaped groove includes a transverse groove arranged on the top surface and an arc-shaped groove at the left end of the transverse groove along the upper outer shell inner layer downward to the bottom surface of the upper half of the inner layer of the outer shell, the transverse groove and the arc-shaped groove are connected, and the width of the transverse groove is greater than the width of the limit pin.
[0009] Preferably: the front and rear sides of the upper half of the outer layer of the inner shell are symmetrically provided with first upper protrusions near the bottom surface, the first upper protrusions are provided with a through hole, the front and rear sides of the lower half of the outer layer of the inner shell are symmetrically provided with first lower protrusions corresponding to the first upper protrusions near the top surface, the first lower protrusions are provided with a through hole, and the through hole on the first upper protrusions corresponds to the through hole on the first lower protrusions, the front and rear sides of the upper half of the outer layer of the outer shell are symmetrically provided with second upper protrusions near the bottom surface, the second upper protrusions are provided with a through hole, the front and rear sides of the lower half of the outer layer of the outer shell are symmetrically provided with second lower protrusions corresponding to the second upper protrusions near the top surface, the second lower protrusions are provided with a through hole, and the through hole on the second upper protrusions corresponds to the through hole on the second lower protrusions.
[0010] Preferably, the distance measuring device is a laser distance measuring device, which includes a laser distance measuring device and a reflective strip. The laser distance measuring device is installed on the second cover, and the reflective strip is installed on the first cover. The positions of the laser distance measuring device and the reflective strip correspond to each other.
[0011] Preferably: the distance measuring device is a gear set distance measuring device, the gear set distance measuring device includes a rack, a third gear, a second gear, a first shaft, a base, a second shaft, a first gear, a counting gear, and a laser counter. The rack is horizontally installed above the inner layer of the outer shell by being fixedly connected to the inner layer of the outer shell or the second cover. The first shaft is connected to the outer layer of the inner shell in a manner that can rotate around its own axis and is vertically installed below the outer layer of the inner shell. The first shaft is sequentially provided with a second gear and a third gear that rotate synchronously with the first shaft from top to bottom, and the third gear is meshed with the rack. The base is located below the outer layer of the inner shell and is fixedly connected to the outer layer of the inner shell. The second shaft is connected to the base in a manner that can rotate around its own axis and is horizontally installed. The second shaft is sequentially provided with a counting gear and a first gear that rotate synchronously with the second shaft from left to right. The first gear and the second gear are both bevel gears and mesh with each other. The laser counter is installed on the second cover corresponding to the counting gear.
[0012] Beneficial effects: 1. This structure sets the distance measuring device in the inner shell and the outer shell that can be displaced with each other, which improves the accuracy of measurement and avoids damage to the distance measuring instrument; 2. The deformation of the steel strand is amplified by the gear group transmission, which is convenient for measurement and has high distance measurement accuracy; 3. This structure is easy to install and is not limited by the steel cable / steel strand structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Attached Figure 1 Schematic diagram of the monitoring device front view.
[0014] Attached Figure 2 Schematic diagram of the monitoring device from the right.
[0015] Attached Figure 3 Schematic diagram of the inner shell and outer shell assembly structure.
[0016] Attached Figure 4 Schematic diagram of the three-dimensional structure of the inner shell and outer shell assembly.
[0017] Attached Figure 5 Schematic diagram of the three-dimensional structure of the upper part of the shell.
[0018] Attached Figure 6 Schematic diagram of the three-dimensional structure of the upper part of the inner shell.
[0019] Attached Figure 7 Schematic diagram of the laser counter and gear assembly structure.
[0020] Attached Figure 8 Schematic diagram of the structure of the laser ranging device.
[0021] Attached Fig. 9 Schematic diagram of the front view of the gear set distance measuring device.
[0022] Attached Fig.10 Schematic diagram of the gear set distance measuring device from top view.
[0023] Attached Fig.11 Schematic diagram of the gear set.
[0024] Attached Fig.12 Schematic diagram of the monitoring device cross-section.
[0025] The names of the reference numerals are as follows: 1. cable terminal; 2. terminal socket; 3. second fixing ring; 4. cable protection cover; 5. inner layer of outer shell; 6. first limit pin; 7. outer layer of outer shell; 8. limit pin; 9. second limit pin; 10. inner layer of inner shell; 11. fixing plate; 12. outer layer of inner shell; 13. first fixing ring; 14. laser counter; 15. counting gear; 16. laser rangefinder; 17. reflective strip; 18. rack; 19. first gear; 20. base; 21. first shaft; 22. second gear; 23. third gear; 24. second shaft; 25. L-shaped groove. DETAILED DESCRIPTION
[0026] A steel rope deformation monitoring device comprises a steel rope, a cover shell and a monitoring device.
[0027] The steel rope can be a steel strand or a steel cable.
[0028] The housing includes an outer shell on the left, an inner shell on the right, a first cover, a second cover, a first fixing ring 13, and a second fixing ring 3. Both the inner shell and the outer shell are double-layer cylindrical structures, and the inner shell and the outer shell are made of light and strong materials. The first cover, the second cover, the first fixing ring 13, and the second fixing ring 3 are all annular and have the same inner diameter. The inner shell includes an inner cylinder of the inner shell and an outer cylinder of the inner shell, and the outer shell includes an inner cylinder of the outer shell and an outer cylinder of the outer shell. The center lines of the inner cylinder of the inner shell, the outer cylinder of the inner shell, the inner cylinder of the outer shell, the outer cylinder of the outer shell, the first cover, the second cover, the first fixing ring 13, and the second fixing ring 3 are on the same straight line. The inner shell and the outer shell are fitted together, and from the inside to the outside, they are the inner layer 10 of the inner shell, the inner layer 5 of the outer shell, the outer layer 12 of the inner shell, and the outer layer 7 of the outer shell. The inner shell inner layer 10 and the outer shell outer layer 12 are both fixedly connected to the left side of the first cover, the first fixing ring 13 is fixedly connected to the right side of the first cover, the outer shell inner layer 5 and the outer shell outer layer 7 are both fixedly connected to the right side of the second cover, the second fixing ring 3 is fixedly connected to the left side of the second cover, the cover is sleeved on the steel rope through the first fixing ring 13 and the second fixing ring 3, and the first fixing ring 13 and the second fixing ring 3 are fixedly connected to the steel rope. The inner shell and the outer shell can be displaced left and right relative to each other.
[0029] The inner diameter of the first fixing ring 13 is slightly larger than the diameter of the steel strand, and the outer ring of the left end of the inner shell outer layer 12 is provided with an annular first limiting leg 6, which is fixedly connected to the upper inner shell outer layer and can also be integrally formed, and the height of the first limiting leg 6 is slightly smaller than the radius difference between the inner diameter of the outer shell outer layer 7 and the outer diameter of the inner shell outer layer 12. The inner shell inner layer 10, the inner shell outer layer 12, the first cover, and the first fixing ring 13 are all composed of an upper half and a lower half, and the upper half and the lower half are mirror-symmetrical.
[0030] Vertical columnar limiting pins 8 are fixedly installed on the outer side of the left end of the top surface of the upper half of the inner shell inner layer 10 and the outer side of the left end of the bottom surface of the lower half.
[0031] The front and rear sides of the upper half of the inner shell outer layer 12 are symmetrically provided with first upper protrusions near the bottom surface, and the first upper protrusions are provided with through holes. The front and rear sides of the lower half of the inner shell outer layer 12 are symmetrically provided with first lower protrusions corresponding to the first upper protrusions near the top surface, and the first lower protrusions are provided with through holes. The through holes on the first upper protrusions correspond to the through holes on the first lower protrusions. During installation, the upper inner shell outer layer and the lower inner shell outer layer are symmetrically placed in mirror images, and bolts are passed through the through holes in the first upper protrusions and the first lower protrusions to fix the upper and lower inner shells.
[0032] The outer shell inner layer 5, the outer shell outer layer 7, the second sealing cover and the second fixing ring 3 are all composed of an upper half and a lower half, and the upper half and the lower half are mirror-symmetrical.
[0033] The inner circle of the right end of the outer shell layer 7 is provided with an annular second limiting leg 9, which is fixedly connected to the outer shell layer 7 and can also be integrally formed. The height of the second limiting leg 9 is slightly smaller than the radius difference between the inner diameter of the outer shell layer 7 and the outer diameter of the inner shell outer layer 12. The sum of the heights of the first limiting leg 6 and the second limiting leg 9 is greater than the radius difference between the inner diameter of the outer shell layer 7 and the outer diameter of the inner shell outer layer 12. The first limiting leg 6 and the second limiting leg 9 can prevent the inner shell and the outer shell from being separated from each other on the left and right sides, so that the outer shell and the inner shell become a whole.
[0034] The upper and lower parts of the shell inner layer 5 are both provided with L-shaped grooves, and the L-shaped grooves on the upper and lower parts are symmetrically arranged. The L-shaped groove on the upper part of the shell inner layer 5 includes a transverse groove arranged on the top surface and an arc-shaped groove at the left end of the transverse groove along the upper shell inner layer downward to the bottom surface of the upper part of the shell inner layer 5, and the transverse groove and the arc-shaped groove are connected. The width of the transverse groove is greater than the width of the limit pin 8.
[0035] The front and rear sides of the upper half of the outer layer 7 of the outer shell are symmetrically provided with second upper protrusions near the bottom surface, and the second upper protrusions are provided with through holes. The front and rear sides of the lower half of the outer layer 7 of the outer shell are symmetrically provided with second lower protrusions corresponding to the second upper protrusions near the top surface, and the second lower protrusions are provided with through holes. The through holes on the second upper protrusions correspond to the through holes on the second lower protrusions. When installing, the upper inner shell outer layer and the lower inner shell outer layer are symmetrically placed in mirror images, and bolts are passed through the through holes in the second upper protrusions and the second lower protrusions to fix the upper and lower shells.
[0036] During installation, first, the limiting pin 8 on the upper part of the inner layer 10 of the inner shell is vertically inserted into the arc groove of the upper part of the inner layer 5 of the outer shell, and the limiting pin 8 is entered into the left end of the transverse groove along the arc groove, and then the limiting pin 8 is moved to the right along the transverse groove to drive the upper part of the inner shell to be inserted into the upper part of the outer shell. The lower part of the inner shell can be inserted into the lower part of the outer shell by the same method. Epoxy resin is applied to the first fixing ring 13 and the second fixing ring 3, so that the upper and lower parts of the cover shell are attached to the steel strand through the first fixing ring 13 and the second fixing ring 3 and fixedly connected to the steel strand, and the limiting pin 8 is not in contact with the transverse groove, and then the first upper protrusion and the first lower protrusion are fixedly connected by bolts, so that the upper and lower parts of the inner shell are fixedly connected, and the second upper protrusion and the second lower protrusion are fixedly connected by bolts, so that the upper and lower parts of the outer shell are fixedly connected.
[0037] The distance measuring device is installed in the space between the inner shell outer layer 12 and the outer shell inner layer 5.
[0038] In the first embodiment of the distance measuring device, the distance measuring device is a laser distance measuring device, which includes a terminal socket 2, a cable 1, a laser distance measuring device 16, and a reflective strip 17. The laser distance measuring device 16 is installed on the second cover, and a cable protective cover 4 is also installed on the left side of the second cover. The terminal socket 2 is installed on the cable protective cover 4. The terminal socket 2, the cable 1, and the laser distance measuring device 16 are electrically connected in sequence. The reflective strip 17 is installed on the first cover. The positions of the laser distance measuring device 16 and the reflective strip 17 correspond to each other. The length of the stretched steel strand is determined by measuring the distance between the laser distance measuring device 16 and the reflective strip 17. In this embodiment, a set of laser distance measuring devices can be installed in the upper half and the lower half of the housing.
[0039] In the second embodiment of the distance measuring device, the distance measuring device is a gear set distance measuring device, which includes a rack 18, a third gear 23, a second gear 22, a first shaft 21, a base 20, a second shaft 24, a first gear 19, a counting gear 15, and a laser counter 14. The rack 18 is horizontally installed above the inner layer 5 of the outer shell by being fixedly connected to the inner layer 5 of the outer shell or the second cover. The first shaft 21 is connected to the outer layer 12 of the inner shell in a manner that it can rotate around its own axis and is vertically installed below the outer layer 12 of the inner shell. The first shaft 21 is sequentially sleeved from top to bottom. A second gear 22 and a third gear 23 are provided which rotate synchronously with the first shaft, the third gear 23 is meshed with the rack 18, the base 20 is located below the outer layer 12 of the inner shell and is fixedly connected to the outer layer 12 of the inner shell, the second shaft 24 is connected to the base 20 in a manner that it can rotate around its own axis and is installed horizontally, the second shaft 24 is sequentially provided with a counting gear 15 and a first gear 19 which rotate synchronously with the second shaft 24 from left to right, the first gear 19 and the second gear 22 are both bevel gears and meshed with each other, and the laser counter 14 is installed on the second cover corresponding to the counting gear 15. When the inner shell and the outer shell are relatively displaced along the length direction of the steel strand (i.e. the steel strand is deformed), the outer shell will drive the rack 18 to move. Since the rack 18 and the third gear 23 are meshed with each other, the third gear 23 and the second gear 22 rotate coaxially, the second gear 22 and the first gear 19 are meshed with each other, and the first gear 19 and the counting gear 15 rotate coaxially. When the steel strand is elongated, the inner shell and the outer shell are relatively displaced along the length direction of the steel strand, so that the third gear 23 rotates along the rack 18, and in turn drives the second gear 22, the first gear 19, and the counting gear 15 to rotate, and the number of teeth rotated of the counting gear 15 is recorded by the laser counter 14.
[0040] In this embodiment, the total length of the rack 18 is 500mm, and each tooth pitch is 0.1mm. When the inner shell and the outer shell are mutually displaced (that is, when the steel strand is deformed), and the displaced distance is 1 tooth pitch, with a gauge length of 500mm, the steel strand produces a strain of 0.0002 (tooth pitch divided by gauge length); the third gear 23 has a total of 30 teeth, and the rotation angle of each tooth is 12°. Each tooth pitch is 0.1mm. The third gear 23 is meshed with the rack 18, that is, the number of teeth rotated by the third gear 23 is consistent with the number of teeth moved by the rack 18. When the rack 18 moves one tooth pitch, the third gear 23 rotates 1 tooth (that is, the third gear 23 rotates 12°); the second gear 22 has a total of 150 teeth, and the rotation angle of each tooth is 2.4°. Each tooth pitch is 0.3mm. The third gear 23 rotates coaxially with the second gear 22, and the rotation angles of the two gears are consistent. The third gear 23 rotates 1 tooth (i.e. the third gear 23 rotates 12°), and the second gear 22 also rotates 12° (i.e. it rotates 5 teeth). The first gear 19 has a total of 30 teeth, each tooth rotates at an angle of 12°, and each tooth pitch is 0.3mm. The first gear 19 and the second gear 22 are meshed with each other, i.e. the number of teeth rotated by the first gear 19 is consistent with the number of teeth rotated by the second gear 22. When the second gear 22 rotates 5 teeth (i.e. the second gear 22 rotates 12°), the first gear 19 also rotates 5 teeth (i.e. it rotates 60°). The counting gear 13 rotates at an angle of 2.4° per tooth, and each tooth pitch is 0.5mm (the laser counter can recognize the count). The counting gear 13 rotates coaxially with the gear 19, and the two gears rotate at the same angle. When the gear 19 rotates 5 teeth (i.e. the gear 19 rotates 60°), the counting gear 13 also rotates 60°. Whenever the steel strand experiences a strain of 0.0002, the laser counter counts and identifies that the counting gear 13 rotates 25 teeth, and the strain corresponding to a single count (minimum reading unit) is 0.000008 (the strain corresponding to one tooth movement of the rack 15 divided by the number of teeth of the counting gear 13 when the rack 15 moves one tooth). This can meet general strain monitoring requirements.
Claims
1. A steel rope deformation monitoring device, characterized in that: The invention comprises a steel rope, a cover shell, and a distance measuring device. The cover shell comprises an outer shell on the left, an inner shell on the right, a first cover, a second cover, a first fixing ring, and a second fixing ring. The first cover, the second cover, the first fixing ring, and the second fixing ring are all annular and have the same inner diameter. The inner shell and the outer shell are both double-layer cylindrical structures. The center lines of the inner cylinder of the inner shell, the outer cylinder of the inner shell, the inner cylinder of the outer shell, the outer cylinder of the outer shell, the first cover, the second cover, the first fixing ring, and the second fixing ring are on the same straight line. The inner shell and the outer shell are sheathed together, and from the inside to the outside, they are the inner layer of the inner shell, the inner layer of the outer shell, and the inner layer of the outer shell. , inner shell outer layer, outer shell outer layer, the inner shell inner layer, the inner shell outer layer are both fixedly connected to the left side of the first cover, the first fixed ring is fixedly connected to the right side of the first cover, the outer shell inner layer, the outer shell outer layer are both fixedly connected to the right side of the second cover, the second fixed ring is fixedly connected to the left side of the second cover, the cover shell is mounted on the steel rope through the first fixed ring and the second fixed ring, the first fixed ring and the second fixed ring are fixedly connected to the steel rope, the inner shell and the outer shell can be displaced left and right relative to each other, and a distance measuring device for measuring the degree of mutual displacement between the inner shell and the outer shell is installed in the outer shell, and the other is installed in the inner shell.
2. The monitoring device according to claim 1, characterized in that: The outer ring at the left end of the outer layer of the inner shell is provided with a first annular limiting foot, and the height of the first limiting foot is smaller than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell. The inner ring at the right end of the outer layer of the outer shell is provided with a second annular limiting foot, and the height of the second limiting foot is slightly smaller than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell. The sum of the heights of the first limiting foot and the second limiting foot is greater than the radius difference between the inner diameter of the outer layer of the outer shell and the outer diameter of the inner shell.
3. The monitoring device according to claim 1, characterized in that: The inner shell inner layer, the inner shell outer layer, the first cover, the first fixing ring, the outer shell inner layer, the outer shell outer layer, the second cover and the second fixing ring are all composed of an upper half and a lower half, and the upper half and the lower half are mirror-symmetrical.
4. The monitoring device according to claim 3, characterized in that: A vertical columnar limit pin is fixedly installed on the outer side of the left end of the top surface of the upper half of the inner layer of the inner shell, and an L-shaped groove is provided on the upper half of the inner layer of the outer shell. The L-shaped groove includes a transverse groove arranged on the top surface and an arc-shaped groove at the left end of the transverse groove along the upper outer shell inner layer downward to the bottom surface of the upper half of the inner layer of the outer shell, the transverse groove and the arc-shaped groove are connected, and the width of the transverse groove is greater than the width of the limit pin.
5. The monitoring device according to claim 3, characterized in that: The front and rear sides of the upper half of the outer layer of the inner shell are symmetrically provided with first upper protrusions near the bottom surface, and the first upper protrusions are provided with a through hole. The front and rear sides of the lower half of the outer layer of the inner shell are symmetrically provided with first lower protrusions corresponding to the first upper protrusions near the top surface, and the first lower protrusions are provided with a through hole, and the through hole on the first upper protrusions corresponds to the through hole on the first lower protrusions. The front and rear sides of the upper half of the outer layer of the outer shell are symmetrically provided with second upper protrusions near the bottom surface, and the second upper protrusions are provided with a through hole. The front and rear sides of the lower half of the outer layer of the outer shell are symmetrically provided with second lower protrusions corresponding to the second upper protrusions near the top surface, and the second lower protrusions are provided with a through hole, and the through hole on the second upper protrusions corresponds to the through hole on the second lower protrusions.
6. The monitoring device according to claim 1, characterized in that: The distance measuring device is a laser distance measuring device, which includes a laser distance measuring device and a reflective strip. The laser distance measuring device is installed on the second cover, and the reflective strip is installed on the first cover. The positions of the laser distance measuring device and the reflective strip correspond to each other.
7. The monitoring device according to claim 1, characterized in that: The distance measuring device is a gear set distance measuring device, which includes a rack, a third gear, a second gear, a first shaft, a base, a second shaft, a first gear, a counting gear, and a laser counter. The rack is horizontally installed above the inner layer of the outer shell by being fixedly connected to the inner layer of the outer shell or the second cover. The first shaft is connected to the outer layer of the inner shell in a manner that can rotate around its own axis and is vertically installed below the outer layer of the inner shell. The first shaft is sequentially provided with a second gear and a third gear that rotate synchronously with the first shaft from top to bottom, and the third gear is meshed with the rack. The base is located below the outer layer of the inner shell and is fixedly connected to the outer layer of the inner shell. The second shaft is connected to the base in a manner that can rotate around its own axis and is horizontally installed. The second shaft is sequentially provided with a counting gear and a first gear that rotate synchronously with the second shaft from left to right. The first gear and the second gear are both bevel gears and mesh with each other. The laser counter is installed on the second cover corresponding to the counting gear.