A noise monitoring device for construction areas

Abstract

This invention relates to the field of construction technology, specifically to a noise monitoring device for construction sites. The device includes a support structure and a placement device mounted on top of the support structure. The placement device houses a noise monitor, and wind speed and direction sensors are respectively mounted on the top of its left and right ends. An environmental monitoring information display screen is mounted on the outer wall of the placement device. When rainy weather occurs, the drive motor of this noise monitoring device starts, rotating a second worm gear via a rotating shaft. This worm gear, in turn, alters the internal structure of the transmission assembly, thereby changing the position of the movable frame housing the noise monitor. The movable plate of the rod, rotating along with the rotating shaft, moves a rain shield above the noise monitor, protecting the internal electronic components from rain damage.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a noise monitoring device for building construction areas. Background Technology

[0002] A noise monitoring device for construction sites is used to monitor noise levels generated during construction, providing scientific data for noise pollution control. It typically consists of sensors, a data acquisition unit, and a display, enabling real-time monitoring of noise levels in the construction area and transmitting the data to a control center for analysis and processing. This device can effectively reduce noise pollution during construction, improve the construction environment, and protect the health of surrounding residents and workers.

[0003] However, to improve the accuracy and reliability of monitoring data and enable coverage of the entire construction area, allowing for the measurement of noise levels at different locations and directions, workers need to use wrenches and bolts to install the noise monitoring device on the support rod. This prolongs the time the noise monitoring device is in use and hinders subsequent maintenance. Furthermore, noise monitoring devices are typically placed in open areas of the construction site. During heavy summer rains, the large amount of rainwater dilutes sound in the air, shortening the sound travel distance and preventing the noise monitoring device from functioning properly. Additionally, excessive rainwater may damage the internal electronic components of the monitoring instrument, causing it to malfunction.

[0004] In view of this, we propose a noise monitoring device for construction areas.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a noise monitoring device for construction areas to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A noise monitoring device for a construction site includes a support device and a placement device disposed on top of the support device. The placement device is equipped with a noise monitoring instrument inside, and wind speed and wind direction sensors are respectively disposed on the top of the left and right ends of the placement device. An environmental monitoring information display screen is disposed on the outer wall of the placement device.

[0009] The support device includes a support rod, a connecting cylinder disposed at the top of the support rod, and a limiting part disposed inside the connecting cylinder;

[0010] The limiting part includes a torsion shaft, a first worm wheel disposed on the outer wall of the torsion shaft near the center position, a bidirectional lead screw disposed above the first worm wheel, a first worm disposed at the center position on the outer wall of the bidirectional lead screw and rotating with the first worm wheel, a rotating disk disposed above the bidirectional lead screw, a plurality of bent rods disposed on the outer wall of the rotating disk, and a movable insert plate disposed at the outer end of the bent rods and changing its own position as it moves.

[0011] The placement device includes a docking ring, a placement box disposed on the top of the docking ring, and a rainproof part disposed inside the placement box;

[0012] The rain-shielding part includes a rotating shaft, a second worm gear disposed at the end of the rotating shaft and rotating therewith, a second worm disposed above the second worm gear and rotating therewith, a transmission assembly disposed above the rotating shaft, a movable frame disposed above the transmission assembly for providing a fixed platform for the noise monitoring instrument, and two sets of movable components disposed opposite to each other above the movable frame.

[0013] The transmission assembly includes a transmission rod, arc-shaped gears disposed at the front and rear ends of the transmission rod, a connecting plate disposed on the inner side of the arc-shaped gears, and a connecting rod disposed at the top of the connecting plate.

[0014] The movable component includes two parallel rod-shaped movable plates, a box-shaped movable plate parallel to the outside of the rod-shaped movable plates, and rainproof baffles located at the top of the rod-shaped movable plates and the box-shaped movable plates.

[0015] In the technical solution of the present invention, the bottom of the support rod is integrally formed with a square plate for increasing the bottom contact area. The connecting cylinder is welded and fixed to the support rod. The inside of the connecting cylinder is provided with a groove for placing the limiting part. A rotating hole is provided at the center of the top surface of the connecting cylinder for providing a rotation range for the rotating disk. Several regularly distributed moving grooves are provided on the outside of the rotating hole on the top surface of the connecting cylinder. Connecting grooves communicating with the groove inside the cylinder are provided on the bottom groove walls of two symmetrically distributed moving grooves. Several cylinder wall through grooves communicating with the moving grooves are provided on the outer wall of the connecting cylinder.

[0016] In the technical solution of the present invention, the left and right ends of the torsion shaft are respectively rotatably connected to the outer side walls of the left and right ends of the connecting cylinder. Both ends of the torsion shaft are provided with internal hexagonal holes for matching internal hexagonal wrenches. The first worm gear is fixedly connected to the outer side wall of the torsion shaft by a locking pin. The front and rear ends of the bidirectional lead screw are respectively rotatably connected to the inner side walls of the front and rear ends of the connecting cylinder. The first worm gear is welded and fixed to the outer side wall of the bidirectional lead screw at a position near the middle.

[0017] In the technical solution of the present invention, the movable insert plate is slidably connected to the inside of the movable groove, wherein the bottom of the two movable insert plates is integrally formed with an arc-shaped protrusion threaded to a bidirectional lead screw, the transverse cross section of the bent rod is L-shaped, and the two ends of the bent rod are rotatably connected to the top surface of the movable insert plate and the outer side wall of the rotating disk, respectively.

[0018] In the technical solution of the present invention, a circular plate integrally formed at the center of the bottom surface of the rotating disk is rotatably connected to the inside of the rotating hole. Several pressure springs are welded and fixed on the outer side walls of the other two movable insert plates, and the other end of each pressure spring is welded and fixed on the inner side wall of the movable groove.

[0019] In the technical solution of the present invention, the transverse cross-section of the docking ring is circular, the internal dimensions of the docking ring are adapted to the external dimensions of the connecting cylinder near the top, and a plurality of insertion slots are provided on the outer side wall of the docking ring, the same number as the number of the movable insert plates and corresponding to each other in position.

[0020] In the technical solution of the present invention, the placement box includes a fixed box body welded and fixed to the top surface of the docking ring body, and a monitoring host box fixedly connected to the outer side walls of the left and right ends of the fixed box body by screws. The fixed box body has a placement groove communicating with the top surface. The fixed box body has extension grooves at the corners of the groove walls at the left and right ends of the placement groove, which provide a moving range for the movable plate of the rod body and the movable plate of the box body. The environmental monitoring information display screen is fixedly connected to the outer side wall of the fixed box body by screws.

[0021] In the technical solution of the present invention, one end of the rotating shaft is coaxially connected to a drive motor, the drive motor is fixedly connected to the bottom wall of the placement groove by bolts, the second worm gear is fixedly connected to the outer wall of the rotating shaft by a snap pin, and the second worm is snapped and fixed to the outer wall of the transmission rod.

[0022] In the technical solution of the present invention, the front and rear ends of the transmission rod are rotatably connected to the inner side walls of the front and rear ends of the placement groove, respectively. The arc gear and the connecting plate are both fixedly connected to the outer side wall of the transmission rod by a locking pin. The two sets of arc gears arranged opposite to each other mesh with each other. The upper and lower ends of the connecting rod are rotatably connected to the top end of the connecting plate and the outer side wall of the moving frame, respectively.

[0023] In the technical solution of the present invention, the bottom end of the movable plate of the rod is snapped and fixed to the outer side wall of the transmission rod, the top end of the movable plate of the rod is rotatably connected to the outer side wall of the rain shield, the bottom end of the movable plate of the box is rotatably connected to the inner side wall of the placement slot, the top end of the movable plate of the box is rotatably connected to the outer side wall of the rain shield, and the two rain shields on the left and right provide placement areas for the wind speed sensor and the wind direction sensor, respectively.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This noise monitoring device for construction areas uses a torsion shaft in the torsion limiting part. As the torsion shaft rotates, the first worm gear drives the first worm to rotate, which in turn drives the double-sided lead screw to rotate. The movable insert plates threaded to both ends of the double-sided lead screw move towards each other, causing the position of the bending rod to change, which in turn drives the rotating disk to rotate. This causes the other two movable insert plates, which are connected to the rotating disk via the bending rod, to move together, allowing the docking ring to quickly separate from the connecting cylinder. This enables the quick assembly and disassembly of the placement device and the support device, thereby shortening the time it takes for the entire device to be put into use and facilitating subsequent inspection and maintenance by the staff.

[0026] 2. When rainy weather arrives, the drive motor starts, which drives the second worm gear to rotate via the rotating shaft. This, in turn, causes a change in the internal structure of the transmission assembly via the second worm, thereby changing the position of the movable frame on which the noise monitor is installed. The movable plate of the rod, which rotates along with the rotating shaft, moves the rain shield above the noise monitor, thus protecting the electronic components inside the noise monitor from damage by rainwater. Attached Figure Description

[0027] Figure 1 This is one of the overall structural schematic diagrams of the invention;

[0028] Figure 2 This is the second schematic diagram of the overall structure of the invention;

[0029] Figure 3 This is a schematic diagram of the support device in the invention;

[0030] Figure 4 This is a schematic diagram of the connecting cylinder in the invention;

[0031] Figure 5 This is a schematic diagram of the fixing part in the invention;

[0032] Figure 6 This is a partial structural diagram of the fixing part in the invention;

[0033] Figure 7 This is a structural breakdown diagram of the placement device in the invention;

[0034] Figure 8 This is a schematic diagram of the structure of the docking ring in the invention;

[0035] Figure 9 This is a schematic diagram of the structure for placing the box in the invention;

[0036] Figure 10 This is a schematic diagram of the rain-shielding part in the invention;

[0037] Figure 11 This is a partial structural diagram of the rain-shielding part in the invention;

[0038] Figure 12 This is a schematic diagram of the transmission component in the invention;

[0039] Figure 13 This is a schematic diagram of the structure of the active component in the invention;

[0040] Figure 14 This is a schematic diagram of the noise monitoring device in the invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Support device; 10. Support rod; 11. Connecting cylinder; 110. Inner groove of cylinder; 111. Rotating hole; 112. Moving groove; 113. Connecting groove; 114. Through groove of cylinder wall; 12. Limiting part; 120. Torsion shaft; 121. First worm gear; 122. Double-acting lead screw; 123. First worm; 124. Moving insert plate; 125. Bending rod; 126. Rotating disk; 127. Pressure spring;

[0043] 2. Placement device; 20. Docking ring; 201. Insertion slot; 21. Placement box; 210. Fixed box; 2101. Placement groove; 2102. Extension groove; 211. Monitoring main unit box; 22. Rain shelter; 220. Drive motor; 221. Rotating shaft; 222. Second worm gear; 223. Second worm; 224. Transmission assembly; 2240. Transmission rod; 2241. Arc gear; 2242. Connecting plate; 2243. Connecting rod; 225. Moving frame; 226. Movable assembly; 2260. Rod movable plate; 2261. Box movable plate; 2262. Rain shelter baffle;

[0044] 3. Noise monitoring instrument;

[0045] 4. Wind speed sensor;

[0046] 5. Wind direction sensor;

[0047] 6. Environmental monitoring information display screen. Detailed Implementation

[0048] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] Please see Figures 1-14 As shown, this embodiment provides a technical solution:

[0050] A noise monitoring device for a construction site includes a support device 1 and a placement device 2 set on top of the support device 1. The placement device 2 is equipped with a noise monitoring instrument 3 inside. The top of the left and right ends of the placement device 2 is equipped with a wind speed sensor 4 and a wind direction sensor 5, respectively. An environmental monitoring information display screen 6 is provided on the outer wall of the placement device 2.

[0051] In this embodiment, as Figures 1-6 As shown, the support device 1 includes a support rod 10, a connecting cylinder 11 disposed at the top of the support rod 10, and a limiting part 12 disposed inside the connecting cylinder 11.

[0052] Furthermore, the bottom of the support rod 10 is integrally formed with a square plate to increase the bottom contact area. The connecting cylinder 11 is welded and fixed to the support rod 10. The inside of the connecting cylinder 11 is provided with an inner groove 110 for placing the limiting part 12. The center of the top surface of the connecting cylinder 11 is provided with a rotating hole 111 for providing a rotation range for the rotating disk 126. The top surface of the connecting cylinder 11 is provided with several regularly distributed moving grooves 112 outside the rotating hole 111. The bottom groove wall of two symmetrically distributed moving grooves 112 is provided with a connecting groove 113 that communicates with the inner groove 110. The outer wall of the connecting cylinder 11 is provided with several cylinder wall through grooves 114 that communicate with the moving grooves 112.

[0053] Furthermore, the support rod 10 is used to raise the height of the connecting cylinder 11, the movable groove 112 on the connecting cylinder 11 is used to provide a moving range for the movable insert 124 in the limiting part 12, the connecting groove 113 is used to provide a moving range for the arc-shaped protrusions at the bottom of two of the movable inserts 124, and the cylinder wall through groove 114 is used to provide a moving range for the ends of the movable inserts 124.

[0054] In this embodiment, as Figures 5-6 As shown, the limiting part 12 includes a torsion shaft 120, a first worm gear 121 disposed on the outer wall of the torsion shaft 120 near the center position, a bidirectional lead screw 122 disposed above the first worm gear 121, a first worm 123 disposed at the center position of the outer wall of the bidirectional lead screw 122 and rotating with the first worm gear 121, a rotating disk 126 disposed above the bidirectional lead screw 122, a plurality of bent rods 125 disposed on the outer wall of the rotating disk 126, and a movable insert plate 124 disposed at the outer end position of the bent rods 125 and changing its own position as it moves;

[0055] Specifically, the left and right ends of the torsion shaft 120 are rotatably connected to the outer side walls of the left and right ends of the connecting cylinder 11, respectively. Both ends of the torsion shaft 120 are provided with internal hexagonal holes for matching internal hexagonal wrenches. The first worm gear 121 is fixedly connected to the outer side wall of the torsion shaft 120 by a locking pin. The front and rear ends of the double-acting screw 122 are rotatably connected to the inner side walls of the front and rear ends of the connecting cylinder 11, respectively. The first worm 123 is welded and fixed to the outer side wall of the double-acting screw 122 near the middle.

[0056] Furthermore, the movable insert plate 124 is slidably connected to the inside of the movable groove 112. The bottom of the two movable insert plates 124 is integrally formed with an arc-shaped protrusion threaded to the bidirectional lead screw 122. The transverse cross section of the bent rod 125 is L-shaped, and the two ends of the bent rod 125 are rotatably connected to the top surface of the movable insert plate 124 and the outer wall of the rotating disk 126, respectively.

[0057] Furthermore, a circular plate is integrally formed at the center of the bottom surface of the rotating disk 126 and is rotatably connected to the inside of the rotating hole 111. Several pressure springs 127 are welded and fixed on the outer walls of the other two movable insert plates 124, and the other ends of the pressure springs 127 are welded and fixed on the inner wall of the movable groove 112.

[0058] Furthermore, after the torsion shaft 120 in the limiting part 12 is torsioned, the first worm gear 121, which rotates with the torsion shaft 120, drives the first worm 123 to rotate, which in turn drives the bidirectional lead screw 122 to rotate. The movable insert plates 124 threaded to both ends of the bidirectional lead screw 122 will move towards each other, which will cause the position of the bending rod 125 to change, and then drive the rotating disk 126 to rotate, so that the other two movable insert plates 124 connected to the rotating disk 126 through the bending rod 125 move together, allowing the docking ring 20 to quickly separate from the connecting cylinder 11, realizing the quick assembly and disassembly of the placement device 2 and the support device 1.

[0059] In this embodiment, as Figures 7-13 As shown, the placement device 2 includes a docking ring 20, a placement box 21 disposed on the top of the docking ring 20, and a rainproof part 22 disposed inside the placement box 21.

[0060] Specifically, the transverse cross-section of the docking ring 20 is circular, the internal dimensions of the docking ring 20 are adapted to the external dimensions of the connecting cylinder 11 near the top, and a number of insertion slots 201 are provided on the outer wall of the docking ring 20, which are the same number as the movable insert plates 124 and correspond one-to-one in position.

[0061] Furthermore, the placement box 21 includes a fixed box 210 welded to the top surface of the docking ring 20 and a monitoring host box 211 fixed to the outer walls of the left and right ends of the fixed box 210 by screws. The fixed box 210 has a placement groove 2101 that communicates with the top surface. The fixed box 210 has extension grooves 2102 at the corners of the groove walls at the left and right ends of the placement groove 2101 to provide a moving range for the rod movable plate 2260 and the box movable plate 2261. The environmental monitoring information display screen 6 is fixed to the outer wall of the fixed box 210 by screws.

[0062] Furthermore, the insertion slot 201 on the docking ring 20 is used to provide insertion space for the movable insert plate 124, the fixed box 210 is used to ensure the strength of the overall structure of the placement box 21, and the placement slot 2101 inside the fixed box 210 is used to provide a placement area for the rainproof part 22.

[0063] In this embodiment, as Figures 10-13 As shown, the rain shield 22 includes a rotating shaft 221, a second worm gear 222 disposed at the end of the rotating shaft 221 and rotating therewith, a second worm 223 disposed above the second worm gear 222 and rotating therewith, a transmission assembly 224 disposed above the rotating shaft 221, a movable frame 225 disposed above the transmission assembly 224 for providing a fixed platform for the noise monitoring instrument 3, and two sets of movable components 226 disposed opposite to each other above the movable frame 225;

[0064] Furthermore, a drive motor 220 is coaxially connected to one end of the rotating shaft 221. The drive motor 220 is fixedly connected to the bottom wall of the placement groove 2101 by bolts. The second worm gear 222 is fixedly connected to the outer wall of the rotating shaft 221 by a snap pin. The second worm 223 is snapped and fixed to the outer wall of the transmission rod 2240.

[0065] Furthermore, after the drive motor 220 is started, it drives the rotating shaft 221 to rotate, which in turn drives the second worm wheel 222 to rotate, which in turn drives the second worm 223 to rotate, thereby driving the transmission rod 2240, which is fixed to the second worm 223, to rotate together.

[0066] In this embodiment, as Figure 12As shown, the transmission assembly 224 includes a transmission rod 2240, an arc-shaped gear 2241 disposed at the front and rear ends of the transmission rod 2240, a connecting plate 2242 disposed on the inner side of the arc-shaped gear 2241, and a connecting rod 2243 disposed at the top of the connecting plate 2242.

[0067] Furthermore, the front and rear ends of the transmission rod 2240 are rotatably connected to the inner walls of the front and rear ends of the placement groove 2101, respectively. The arc gear 2241 and the connecting plate 2242 are both fixedly connected to the outer wall of the transmission rod 2240 by locking pins. The two sets of arc gears 2241 arranged opposite to each other mesh with each other. The upper and lower ends of the connecting rod 2243 are rotatably connected to the top of the connecting plate 2242 and the outer wall of the moving frame 225, respectively.

[0068] Furthermore, after the transmission rod 2240 rotates, it drives the arc gears 2241 and connecting plates 2242 at both ends of the transmission rod 2240 to rotate together. While the arc gears 2241 rotate, they drive another set of arc gears 2241 meshing with them to rotate as well. This causes the position of another transmission rod 2240 and the connecting plates 2242 at both ends to change. After the positions of the connecting plates 2242 at both ends change, they each drive the position of the connecting rod 2243 at the top to change, thereby causing the moving frame 225 to move together with the noise monitoring instrument 3 inside.

[0069] In this embodiment, as Figure 13 As shown, the movable component 226 includes two rod movable plates 2260 arranged parallel to each other, a box movable plate 2261 arranged parallel to the outside of the rod movable plates 2260, and a rain shield 2262 disposed at the top of the rod movable plates 2260 and the box movable plate 2261.

[0070] Furthermore, the bottom end of the rod movable plate 2260 is snapped and fixed to the outer wall of the transmission rod 2240, the top end of the rod movable plate 2260 is rotatably connected to the outer wall of the rain shield 2262, the bottom end of the box movable plate 2261 is rotatably connected to the inner wall of the placement groove 2101, and the top end of the box movable plate 2261 is rotatably connected to the outer wall of the rain shield 2262. The left and right rain shields 2262 provide placement areas for the wind speed sensor 4 and the wind direction sensor 5, respectively.

[0071] Furthermore, when the transmission rod 2240 rotates, the rod movable plate 2260 fixed at both ends of the transmission rod 2240 in the movable component 226 also rotates accordingly. It cooperates with the box movable plate 2261 used to limit the movement range of the rain shield 2262, thereby causing the position of the top rain shield 2262 to retract inward. When the two rain shields 2262 come into contact, they completely cover the top opening of the placement slot 2101.

[0072] Finally, it should be noted that the drive motor 220, noise monitor 3, wind speed sensor 4, wind direction sensor 5, and environmental monitoring information display screen 6 involved in this invention are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, the drive motor 220, noise monitor 3, wind speed sensor 4, wind direction sensor 5, and environmental monitoring information display screen 6 are connected to an external power supply through wires. The specific connection method should refer to the working principle in this invention. The electrical connections between each electrical component are completed in the order of their operation. The detailed connection methods are all technologies known in the art.

[0073] When the noise monitoring device for construction areas of the present invention is in use, during rainy weather, the drive motor 220 is started, which drives the second worm gear 222 to rotate through the rotating shaft 221, and drives one of the transmission rods 2240 in the transmission assembly 224 to rotate through the second worm 223; thus driving the arc gears 2241 and the connecting plate 2242 at the front and rear ends of the transmission rod 2240 to rotate together.

[0074] As the arc gear 2241 rotates, it drives another set of arc gears 2241 that meshes with it to rotate, thereby changing the position of another transmission rod 2240 and the connecting plates 2242 at the front and rear ends.

[0075] After the positions of the connecting plates 2242, which are paired at both ends, change, they will each drive the position of the connecting rods 2243 at the top to change, thereby causing the moving frame 225, together with the noise monitoring instrument 3 inside, to retract into the placement slot 2101.

[0076] When the transmission rods 2240 rotate, the rod movable plates 2260 fixed at the front and rear ends of the transmission rods 2240 in the movable component 226 also rotate, and cooperate with the box movable plate 2261 used to limit the movement range of the rain shield 2262, thereby causing the position of the top rain shield 2262 to retract inward. When the two rain shields 2262 come into contact, they completely cover the top opening of the placement slot 2101.

[0077] When the entire device needs maintenance, the torsion shaft 120 in the torsion limit part 12 rotates. As the first worm gear 121 rotates with the torsion shaft 120, it drives the first worm 123 to rotate, which in turn drives the bidirectional lead screw 122 to rotate. The movable insert plates 124 threaded to both ends of the bidirectional lead screw 122 will move towards each other, which will cause the position of the bending rod 125 to change, and then drive the rotating disk 126 to rotate. This causes the other two movable insert plates 124 connected to the rotating disk 126 via the bending rod 125 to move together, allowing the docking ring 20 to quickly separate from the connecting cylinder 11, realizing the quick assembly and disassembly of the placement device 2 and the support device 1, thereby shortening the time for the entire device to be put into use.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A noise monitoring device for a construction site, comprising a support device (1) and a placement device (2) disposed on top of the support device (1), wherein a noise monitoring instrument (3) is provided inside the placement device (2), a wind speed sensor (4) and a wind direction sensor (5) are respectively provided on the top of the left and right ends of the placement device (2), and an environmental monitoring information display screen (6) is provided on the outer wall of the placement device (2); characterized in that: The support device (1) includes a support rod (10), a connecting cylinder (11) disposed at the top of the support rod (10), and a limiting part (12) disposed inside the connecting cylinder (11); The limiting part (12) includes a torsion shaft (120), a first worm wheel (121) disposed on the outer side wall of the torsion shaft (120) near the center position, a bidirectional lead screw (122) disposed above the first worm wheel (121), a first worm (123) disposed at the center position of the outer side wall of the bidirectional lead screw (122) and rotating with the first worm wheel (121), a rotating disk (126) disposed above the bidirectional lead screw (122), a plurality of bent rods (125) disposed on the outer side wall of the rotating disk (126), and a movable insert plate (124) disposed at the outer end of the bent rods (125) and changing its own position as it moves; The placement device (2) includes a docking ring (20), a placement box (21) disposed on the top of the docking ring (20), and a rainproof part (22) disposed inside the placement box (21); The rain-shielding part (22) includes a rotating shaft (221), a second worm gear (222) disposed at the end of the rotating shaft (221) and rotating therewith, a second worm (223) disposed above the second worm gear (222) and rotating therewith, a transmission assembly (224) disposed above the rotating shaft (221), a movable frame (225) disposed above the transmission assembly (224) for providing a fixed platform for the noise monitoring instrument (3), and two sets of movable components (226) disposed opposite to each other above the movable frame (225); The transmission assembly (224) includes a transmission rod (2240), an arc gear (2241) disposed at the front and rear ends of the transmission rod (2240), a connecting plate (2242) disposed on the inner side of the arc gear (2241), and a connecting rod (2243) disposed at the top of the connecting plate (2242). The movable component (226) includes two rod movable plates (2260) arranged in parallel front to back, a box movable plate (2261) arranged in parallel outside the rod movable plate (2260), and a rain shield (2262) arranged at the top of the rod movable plate (2260) and the box movable plate (2261).

2. The noise monitoring device for construction areas according to claim 1, characterized in that: The bottom of the support rod (10) is integrally formed with a square plate for increasing the contact area of ​​the bottom surface. The connecting cylinder (11) is welded and fixed to the support rod (10). The inside of the connecting cylinder (11) is provided with a slot (110) for placing the limiting part (12). The center of the top surface of the connecting cylinder (11) is provided with a rotating hole (111) for providing a rotation range for the rotating disk (126). The top surface of the connecting cylinder (11) is provided with several regularly distributed moving grooves (112) on the outside of the rotating hole (111). The bottom groove wall of two symmetrically distributed moving grooves (112) is provided with a connecting groove (113) that communicates with the slot (110) in the cylinder. The outer wall of the connecting cylinder (11) is provided with several through grooves (114) that communicate with the moving grooves (112).

3. The noise monitoring device for construction areas according to claim 1, characterized in that: The left and right ends of the torsion shaft (120) are rotatably connected to the outer side walls of the left and right ends of the connecting cylinder (11), respectively. Both ends of the torsion shaft (120) are provided with internal hexagonal holes for matching internal hexagonal wrenches. The first worm gear (121) is fixedly connected to the outer side wall of the torsion shaft (120) by a locking pin. The front and rear ends of the bidirectional lead screw (122) are rotatably connected to the inner side walls of the front and rear ends of the connecting cylinder (11), respectively. The first worm (123) is welded and fixed to the outer side wall of the bidirectional lead screw (122) near the middle position.

4. The noise monitoring device for construction areas according to claim 2, characterized in that: The movable insert plate (124) is slidably connected to the inside of the movable groove (112). The bottom of the two movable insert plates (124) is integrally formed with an arc-shaped protrusion threaded to the bidirectional lead screw (122). The transverse cross section of the bent rod (125) is L-shaped. The two ends of the bent rod (125) are rotatably connected to the top surface of the movable insert plate (124) and the outer side wall of the rotating disk (126), respectively.

5. The noise monitoring device for construction areas according to claim 2, characterized in that: At the center of the bottom surface of the rotating disk (126), a circular plate is integrally formed and rotatably connected to the inside of the rotating hole (111). Several pressure springs (127) are welded and fixed on the outer side walls of the other two movable insert plates (124). The other end of each pressure spring (127) is welded and fixed on the inner side wall of the movable groove (112).

6. The noise monitoring device for construction areas according to claim 1, characterized in that: The transverse cross section of the docking ring (20) is circular. The internal dimensions of the docking ring (20) are adapted to the external dimensions of the connecting cylinder (11) near the top. Several insertion slots (201) are provided on the outer wall of the docking ring (20) in the same number and corresponding positions as the movable insert plate (124).

7. The noise monitoring device for construction areas according to claim 1, characterized in that: The placement box (21) includes a fixed box (210) welded and fixed to the top surface of the docking ring (20) and a monitoring host box (211) fixed to the outer side walls of the left and right ends of the fixed box (210) by screws. The fixed box (210) has a placement groove (2101) communicating with the top surface inside. The fixed box (210) has extension grooves (2102) at the corners of the groove walls at the left and right ends of the placement groove (2101) to provide a moving range for the rod movable plate (2260) and the box movable plate (2261). The environmental monitoring information display screen (6) is fixed to the outer side wall of the fixed box (210) by screws.

8. The noise monitoring device for construction areas according to claim 7, characterized in that: One end of the rotating shaft (221) is coaxially connected to a drive motor (220), the drive motor (220) is fixedly connected to the bottom wall of the placement groove (2101) by bolts, the second worm gear (222) is fixedly connected to the outer wall of the rotating shaft (221) by a snap pin, and the second worm (223) is snapped and fixed to the outer wall of the transmission rod (2240).

9. The noise monitoring device for construction areas according to claim 7, characterized in that: The front and rear ends of the transmission rod (2240) are rotatably connected to the inner walls of the front and rear ends of the placement groove (2101), respectively. The arc gear (2241) and the connecting plate (2242) are both fixedly connected to the outer wall of the transmission rod (2240) by a snap pin. The two sets of arc gears (2241) arranged opposite to each other mesh with each other. The upper and lower ends of the connecting rod (2243) are rotatably connected to the top of the connecting plate (2242) and the outer wall of the moving frame (225), respectively.

10. The noise monitoring device for a construction area according to claim 7, characterized in that: The bottom end of the movable plate (2260) is snapped and fixed to the outer wall of the transmission rod (2240), and the top end of the movable plate (2260) is rotatably connected to the outer wall of the rain shield (2262). The bottom end of the movable plate (2261) is rotatably connected to the inner wall of the placement slot (2101), and the top end of the movable plate (2261) is rotatably connected to the outer wall of the rain shield (2262). The two rain shields (2262) on the left and right provide placement areas for the wind speed sensor (4) and the wind direction sensor (5), respectively.

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