Foundation pit dust falling device for municipal engineering construction

Abstract

The invention discloses a foundation pit dust falling device for municipal engineering construction, which relates to the technical field of municipal engineering and comprises a water delivery pipe and a plurality of groups of connecting pipes in threaded connection with the horizontal outer wall of one side of the water delivery pipe at equal intervals. A trigger mechanism used for converting vibration of a construction site into power capable of being provided for opening and closing adjustment of a water path in the connecting pipe is fixed to the outer wall of the top end of the connecting pipe, the trigger mechanism comprises an evaporation cylinder body fixed to one side of the outer wall of the top end of the connecting pipe, and a first piston rod is slidably installed in the evaporation cylinder body; and a concave liquid groove is formed in the circle center position of the outer wall of one side of the first piston rod. Construction vibration is sensed in real time through a swing arm in the trigger mechanism, the multi-ring sleeve is linked to generate heat through friction to drive trichlorofluoromethane to evaporate and pressurize, a local atomization nozzle is directionally opened only in a dust raising area, invalid spraying in a non-operation area and a non-construction period is completely eradicated, water waste of traditional equipment is fundamentally solved, and the utilization efficiency of water resources is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal engineering, and specifically relates to a foundation pit dust reduction device for municipal engineering construction. Background Art

[0002] Municipal engineering refers to municipal facility construction projects. Municipal facilities refer to various buildings, structures, and equipment set within the urban area and the scope of urban planning and construction, which are provided by the government as public products and services, either paid or free, for residents. The construction of various public infrastructure supporting urban life all falls within the scope of municipal engineering, such as common urban roads, bridges, and subways, as well as various pipelines closely related to life: rainwater, sewage, water supply, reclaimed water, electricity, telecommunications, heating, and gas, etc. Additionally, the construction of squares, urban greening, etc. also belongs to the scope of municipal engineering; However, dust often appears during construction in the city, which is harmful to the physical health of the surrounding people and the natural environment. In the scenario of foundation pit construction, the spray dust reduction equipment achieves efficient dust reduction by atomizing and spraying liquid towards the dust area. This type of equipment usually uses fasteners to fix the water delivery pipe above the surrounding wall set around the edge of the foundation pit. By turning on the water supply pump, water is transported through the water delivery pipe to each atomizing nozzle at a constant water pressure, forming a water mist curtain that evenly covers the foundation pit. To address the problem of pressure attenuation at the end due to the long water delivery pipeline, the prior art often installs pressure balance valves or constant pressure water supply devices at intervals along the pipeline. By using built-in pressure sensors to monitor the water pressure changes in real-time, when pressure fluctuations are detected, the valve opening is automatically adjusted or the voltage stabilizing component is activated to ensure a stable water supply pressure for each spraying unit, thereby ensuring the consistency of the dust reduction effect in the entire foundation pit area.

[0003] However, the existing foundation pit spray dust reduction equipment still has some deficiencies. Most of the existing foundation pit spray dust reduction equipment adopts the full-area continuous spraying mode. Through the water delivery pipe and atomizing nozzles around the edge of the foundation pit, water mist is continuously sprayed into the foundation pit. Although this working method can achieve the purpose of dust reduction, it conflicts with the special requirements of foundation pit construction for site stability; Firstly, continuous water spraying easily leads to excessive soil moisture content in the foundation pit, causing the ground to be muddy and slippery. This not only increases the risk of personnel slipping and falling, but also may cause engineering vehicles to get stuck in the mud, affecting the construction progress. At the same time, excessive water seepage may weaken the strength of the soil mass on the foundation pit slope, threatening the stability of the foundation pit support structure and triggering potential landslide hazards; Secondly, due to the inability to accurately identify the dust generation area, the existing equipment still maintains the spraying state during non-construction periods or in areas without dust operations, resulting in a large amount of water resource waste. When construction workers are operating in a local area within the foundation pit, full-area water spraying will also interfere with construction operations, reducing work efficiency and making it difficult to meet the intelligent and refined requirements of municipal engineering foundation pit dust reduction because of the problems that the present invention aims to solve.

[0004] In view of the above problems, it is urgent to innovate and design on the basis of the original spray dust suppression equipment. Summary of the Invention

[0005] The technical solution of the present invention provides a solution significantly different from the prior art for the technical problem that the solution of the prior art is too single. Specifically, the purpose of the present invention is to provide a spray dust suppression device to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A foundation pit dust suppression device for municipal engineering construction, including a water delivery pipe and a plurality of connecting pipes threadedly connected at equal intervals on the horizontal outer wall of one side thereof. A trigger mechanism is fixed on the outer wall of the top of the connecting pipe for converting the vibration of the construction site into power for opening and closing adjustment of the water path inside the connecting pipe. The trigger mechanism includes an evaporation cylinder fixed on one side of the outer wall of the top of the connecting pipe. A first piston rod is slidably installed inside the evaporation cylinder, and a concave liquid groove is formed at the center position of the outer wall on one side of the first piston rod. A multi-ring sleeve is inserted through the inner wall of the evaporation cylinder. A swing arm is fixed at the center position of the outer wall on the side of the multi-ring sleeve away from the first piston rod. A first gear is fixed at the center position on the side of the swing arm away from the multi-ring sleeve. And a trichlorofluoromethane with the physical properties of low boiling point and high melting point is filled in the cavity formed by the evaporation cylinder and the first piston rod. The outer wall of the first gear is engaged with an auxiliary swing assembly for driving the multi-ring sleeve to rotate bidirectionally and reciprocally. Preferably, the multi-ring sleeve is integrally concentrically multi-ringed, and a concentric circular ring groove with matching size and shape is formed at the contact position between the inner wall of the first piston rod and the multi-ring sleeve. The evaporation cylinder and the multi-ring sleeve are both made of beryllium copper, a metal with good wear resistance, high strength and good thermal conductivity. Preferably, the auxiliary swing assembly includes a support rod fixed on the outer wall of the top of the connecting pipe. A second gear is rotatably installed on one side of the outer wall of the top of the support rod. A torsion spring is sleeved on the rotating shaft at the center of the second gear, and both ends of the torsion spring are relatively fixed to the second gear and the support rod respectively. The support rod is engaged with the first gear. Preferably, a moving rod is slidably installed at the central axis position inside the connecting pipe through a plurality of limiting frames. Both ends of the inner wall of the connecting pipe are tapered inwards. Conical plugs for matching the size of the tapered inwards of the inner wall of the connecting pipe are fixed at both ends of the moving rod. Preferably, annular grooves are formed at the central positions of the outer walls of the two groups of conical plugs close to the water delivery pipe. A limiting piece is fixed at a position on the inner wall of the connecting pipe close to the water delivery pipe. A T-shaped rod that slides through the center of the limiting piece is fixed at the center of the annular groove of one of the conical plugs. A rust-resistant spring for providing an auxiliary force for the moving rod to laterally move back to close the water path is sleeved on the outer wall of the T-shaped rod, and both ends of the rust-resistant spring are in contact with the outer wall of the limiting piece and the inner wall of the annular groove of the conical plug respectively; Preferably, a dial rod is fixed to the outer wall at the middle position of the moving rod. The dial rod penetrates through the connecting pipe upward. One end of the first piston rod is rotatably connected to one side of the top outer wall of the dial rod. Two groups of curved tile-shaped pieces are sequentially fixed to the outer wall of the dial rod up and down; Preferably, a through groove with a matching size is formed at the position where the top outer wall of the connecting pipe contacts the dial rod and its lateral movement path, and the two groups of tile-shaped pieces are respectively in close contact with the outer wall and the inner wall of the connecting pipe; Preferably, a delay mechanism for extending the water path closing time is fixed to the top outer wall of the connecting pipe and close to the water delivery pipe; The delay mechanism includes a delay cylinder body fixed to the top outer wall of the connecting pipe. A second piston rod is slidably installed inside the delay cylinder body. A plurality of first tapered holes are formed at equal angles around the center on the outer wall of one end of the second piston rod. A plurality of second tapered holes are formed at equal angles around the center on the outer wall of one end of the second piston rod. Both the first tapered hole and the first tapered hole are tapered through holes, and the first tapered hole and the second tapered hole are integrally formed in an annular staggered manner. The inside of the delay cylinder body is filled with a viscous damping liquid; Preferably, the bottom outer walls of the evaporation cylinder body and the delay cylinder body are both in sliding fit with the tile-shaped piece. Curved sliding grooves with matching sizes and shapes are formed at the sliding fit positions of the evaporation cylinder body and the delay cylinder body with the tile-shaped piece; Preferably, a spray head is threadedly connected to one end of the connecting pipe away from the water delivery pipe. A counterweight block is slidably sleeved on the outer wall of the swing arm.

[0007] Compared with the prior art, the beneficial effects of the present invention are: 1. The device can sense the construction vibration in real time through the swing arm in the triggering mechanism, drive the evaporation and pressurization of trichlorofluoromethane by the friction heat generation of the multi-ring sleeve, and only orientally open the local spray head in the dust area, eliminating the ineffective spraying in the non-operation area and non-construction period, and solving the "flood irrigation" waste of traditional equipment from the root cause, significantly improving the water resource utilization efficiency.

[0008] 2. After the vibration stops, the flow-limiting characteristic of the viscous damping liquid in the delay component is used to cooperate with the second piston rod and the delay cylinder body to slow down the water path closing rate, so that the spraying gradually stops in a short time, which not only ensures the full settlement of the residual dust, but also avoids the soil being too wet caused by continuous water spraying, and avoids repeated water spraying of "stopping immediately"; In addition, the precise dosage control spray mode can keep the humidity of the foundation pit surface within a safe range. Combined with the drainage design of the construction site, it can effectively keep the ground dry and firm, improve the safety of personnel operations and the passing efficiency of engineering vehicles, and solve the problem of muddy site caused by traditional dust reduction methods. Brief Description of the Drawings

[0009] Figure 1 This is the overall front view of the device of the present invention.

[0010] Figure 2 This is the partially sectioned view of the connecting pipe of the present invention.

[0011] Figure 3 This is the sectional view and partial enlarged detail view of the present invention.

[0012] Figure 4 This is the overall sectional view of the device of the present invention.

[0013] Figure 5 This is the overall sectional view and partial enlarged detail view of the device of the present invention.

[0014] Figure 6 This is the sectional plan view of the device of the present invention.

[0015] Figure 7 For the present invention Figure 6 The enlarged detail view at position A.

[0016] Figure 8 This is the sectional view of the second piston rod of the present invention.

[0017] Figure 9 This is the end face plan view of the second piston rod of the present invention.

[0018] Figure 10 This is the internal exploded split and partial enlarged view of the connecting pipe of the present invention.

[0019] Figure 11 This is the detailed view of the connection structure of the evaporation sealed cylinder body and the first piston rod of the present invention.

[0020] Figure 12 This is the detailed view of the structure of the first piston rod of the present invention.

[0021] In the figure: 1, water delivery pipe; 11, atomizing nozzle; 2, connecting pipe; 21, moving rod; 211, conical plug; 212, T-shaped rod; 22, limiting piece; 23, lever; 24, tile-shaped piece; 25, rust-resistant spring; 3, evaporation cylinder body; 31, first piston rod; 32, multi-ring sleeve; 33, swing arm; 34, first gear; 35, counterweight; 4, support rod; 41, second gear; 5. Delay cylinder block; 51. Second piston rod; 52. First conical hole; 53. Second conical hole. Specific implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 to 12 , the present invention provides a technical solution: a foundation pit dust reduction device for municipal engineering construction, including a water delivery pipe 1 and a plurality of connecting pipes 2 threadedly connected at equal intervals on the horizontal outer wall on one side thereof. A trigger mechanism for converting the vibration of the construction site into power for opening and closing the water path inside the connecting pipe 2 is fixed on the outer wall of the top end of the connecting pipe 2; The trigger mechanism includes an evaporation cylinder block 3 fixed on one side of the outer wall of the top end of the connecting pipe 2. A first piston rod 31 is slidably installed inside the evaporation cylinder block 3, and a concave liquid groove is opened at the center position of the outer wall on one side of the first piston rod 31. A multi-ring sleeve 32 is inserted through the inner wall of the evaporation cylinder block 3. A swing arm 33 is fixed at the center position of the outer wall on the side of the multi-ring sleeve 32 away from the first piston rod 31. A first gear 34 is fixed at the center position of the side of the swing arm 33 away from the multi-ring sleeve 32, and trichlorofluoromethane with the physical properties of low boiling point and high melting point is filled in the cavity formed by the evaporation cylinder block 3 and the first piston rod 31; An auxiliary swing assembly for driving the multi-ring sleeve 32 to reciprocate bidirectionally is engaged with the outer wall of the first gear 34.

[0024] As a further implementation scheme of the present invention, the multi-ring sleeve 32 is integrally concentric multi-ring shaped, and a concentric circular ring groove with matching dimensions and shapes is opened at the contact position between the inner wall of the first piston rod 31 and the multi-ring sleeve 32. The whole body materials of the evaporation cylinder block 3 and the multi-ring sleeve 32 are both beryllium copper, a metal with good wear resistance, high strength and good thermal conductivity; In specific implementation, the multi-ring sleeve 32 integrally in the shape of concentric multi-rings is fully attached to the evaporation cylinder block 3. When the multi-ring sleeve 32 rotates, heat is generated by friction at its contact surface, and the thermal conductivity of beryllium copper is good, so the heat is transferred to the inner cavity and heats the trichlorofluoromethane to evaporate. After the trichlorofluoromethane evaporates, the pressure in the inner cavity increases, and the first piston rod 31 extends and pushes the lever 23 and the second piston rod 51.

[0025] As a further embodiment of the present invention, the auxiliary swing assembly includes a support rod 4 fixed to the outer wall of the top end of the connecting pipe 2. On one side of the outer wall of the top end of the support rod 4, a second gear 41 is rotatably installed. A torsion spring is sleeved on the outer wall of the rotating shaft at the center of the second gear 41, and the two ends of the torsion spring are relatively fixed to the second gear 41 and the support rod 4 respectively. The support rod 4 meshes with the first gear 34; In specific implementation, when the swing arm 33 swings up and down due to the vibration of the field, the first gear 34 meshes with the second gear 41 and rotates. Since the transmission ratio of the first gear 34 to the second gear 41 is about two to one, the small swing of the swing arm 33 is amplified by this gear set and the torsion spring is synchronously tightened for energy storage. When the swing arm 33 rotates in the reverse direction and swings back to its original position with insufficient kinetic energy, this torsion spring can provide certain assistance for it.

[0026] As a further embodiment of the present invention, a moving rod 21 is slidably installed in the inner central axis position of the connecting pipe 2 through a plurality of groups of limiting frames. Both ends of the inner wall of the connecting pipe 2 are tapered and closed. Conical plugs 211 for matching the sizes of the tapered closures at both ends of the inner wall of the connecting pipe 2 are fixed to both ends of the moving rod 21; In specific implementation, when the lever 23 drives the moving rod 21 to move horizontally left and right, the two conical plugs 211 can cooperate with the tapered closures at both ends of the inner wall of the connecting pipe 2 to quickly open and close the waterway.

[0027] As a further embodiment of the present invention, annular grooves are opened at the central positions of the outer walls of the two conical plugs 211 on the side close to the water delivery pipe 1. A limiting piece 22 is fixed at the position of the inner wall of the connecting pipe 2 close to the water delivery pipe 1. A T-shaped rod 212 that slidably penetrates the center of the limiting piece 22 is fixed at the center of the annular groove of one of the conical plugs 211. A corrosion-resistant spring 25 for providing an auxiliary force for the moving rod 21 to move horizontally back to its original position and close the waterway is sleeved on the outer wall of the T-shaped rod 212, and the two ends of the corrosion-resistant spring 25 are respectively in contact with the outer wall of the limiting piece 22 and the inner wall of the annular groove of the conical plug 211; In specific implementation, the annular grooves opened in the conical plugs 211 can increase the contact area of the flowing water. By continuously impacting the conical plugs 211 and the annular grooves with the high-pressure flowing water, the conical plugs 211 can be automatically reset to close the waterway. When the conical plugs 211 are reset and move horizontally, the corrosion-resistant spring 25 rebounds and returns to its original position and releases elastic potential energy to assist the conical plugs 211 in moving horizontally back to their original positions.

[0028] As a further embodiment of the present invention, a lever 23 is fixed to the outer wall at the middle position of the moving rod 21. The lever 23 penetrates the connecting pipe 2 upward. One end of the lever 23 is rotatably connected to one end of the first piston rod 31. Two groups of curved tile-shaped pieces 24 are sequentially fixed on the outer wall of the lever 23 up and down; In specific implementation, both groups of the bent tile-shaped pieces 24 are in the shape of bent tiles, and sealing rings are provided at the contact positions with the surface (inner wall and outer wall) of the connecting pipe 2 to ensure the airtightness inside the connecting pipe 2.

[0029] As a further implementation scheme of the present invention, through grooves with matching dimensions are opened at the contact positions between the outer wall of the top end of the connecting pipe 2, the lever 23 and its transverse movement path, and the two groups of tile-shaped pieces 24 are respectively closely attached to the outer wall and the inner wall of the connecting pipe 2; In specific implementation, the through groove opened on the outer wall of the connecting pipe 2 matches the size of the lever 23, and the cooperation of the two groups of tile-shaped pieces 24 with sealing rings can prevent the water flow inside the connecting pipe 2 from leaking along the through groove.

[0030] As a further implementation scheme of the present invention, a time-delay mechanism for extending the water path closing time is fixed on the outer wall of the top end of the connecting pipe 2 and close to the water delivery pipe 1; The time-delay mechanism includes a time-delay cylinder body 5 fixed on the outer wall of the top end of the connecting pipe 2. A second piston rod 51 is slidably installed inside the time-delay cylinder body 5. Multiple groups of first tapered holes 52 are arranged at equal angles around the center on the outer wall of one end of the second piston rod 51. Multiple groups of second tapered holes 53 are arranged at equal angles around the center on the outer wall of one end of the second piston rod 51. Both the first tapered holes 52 and the first tapered holes 52 are tapered perforations, and the first tapered holes 52 and the second tapered holes 53 are integrally arranged in a circular staggered manner. The inside of the time-delay cylinder body 5 is filled with a viscous damping liquid; In specific implementation, when the first piston rod 31 extends outward, it synchronously drives the second piston rod 51 to retract inward. While the second piston rod 51 retracts inward, the viscous damping liquid inside the time-delay cylinder body 5 flows from one side to the other side along the multiple groups of first tapered holes 52. On the contrary, when the second piston rod 51 extends outward, the viscous damping liquid flows from the other side of the multiple groups of second tapered holes 53 to one side. The first tapered holes 52 and the second tapered holes 53 are integrally arranged in a circular staggered manner and the orientations of their tapered openings are opposite. The number of the first tapered holes 52 is much larger than the number of the second tapered holes 53. Therefore, the retracting speed of the second piston rod 51 is faster than the extending speed, and the time required for the cooling and liquefaction process of trichlorofluoromethane is superimposed to achieve the time-delay effect on the reset transverse movement of the lever 23.

[0031] As a further implementation scheme of the present invention, the bottom outer walls of the evaporation cylinder body 3 and the time-delay cylinder body 5 are both slidably attached to the tile-shaped piece 24, and curved sliding grooves with matching dimensions and shapes are opened at the sliding attachment positions of the evaporation cylinder body 3 and the time-delay cylinder body 5 with the tile-shaped piece 24; In specific implementation, the curved sliding groove can play a function of strengthening the limit on the tile-shaped piece 24 to prevent it from loosening and causing the water flow inside the connecting pipe 2 to leak.

[0032] As a further embodiment of the present invention, the end of the connecting pipe 2 away from the water delivery pipe 1 is threadedly connected with an atomizing nozzle 11, and a counterweight 35 is slidably sleeved on the outer wall of the swing arm 33.

[0033] In specific implementation, a counterweight 35 is slidably sleeved on the outer wall of the swing arm 33, and the counterweight 35 is fixed by one end of a bolt abutting against the swing arm 33. By adjusting the position of the counterweight 35, the swing amplitude of the swing arm 33 can be adjusted.

[0034] Working principle: First, when the swing arm 33 in the triggering mechanism senses vibration and starts to swing, the swing arm 33 drives the multi-ring sleeve 32 to rotate. Since the multi-ring sleeve 32 continuously rubs against the corresponding annular grooves on the inner wall of the evaporation cylinder 3, a large amount of heat is generated. Then, the heat is transferred through the beryllium copper layer provided on the inner wall of the evaporation cylinder 3 (beryllium copper material has high thermal conductivity and strength) and heats the trichlorofluoromethane located in the cavity (the closed cavity formed by the intersection of the evaporation cylinder 3 and the multi-ring sleeve 32). The alias of this liquid is R11, with a melting point of -111 °C and a boiling point of 23.7 °C. Then, while the trichlorofluoromethane evaporates due to heat, the pressure inside the cavity continuously increases. At this time, the first piston rod 31 extends out of the evaporation cylinder 3 and drives the shift lever 23 and the second piston rod 51 to move synchronously; Among them, while the swing arm 33 starts to rotate clockwise due to the vibration of the construction site, it drives the first gear 34 in the auxiliary swing assembly to rotate synchronously. The first gear 34 meshes with and drives the second gear 41 to rotate counterclockwise. While the second gear 41 rotates, the torsion spring is tightened. When the torsion spring is twisted to the limit, it drives the second gear 41 and the first gear 34 to rotate in the reverse direction. The first gear 34 drives the swing arm 33 and the multi-ring sleeve 32 to rotate counterclockwise. This process repeats continuously until the "kinetic energy" is exhausted and stops. The "kinetic energy" includes the kinetic energy of the swing arm 33 swinging up and down due to the vibration of the site and the elastic potential energy stored when the torsion spring is tightened; After the shift lever 23 drives the tile-shaped piece 24, the moving rod 21, and the tapered plug 211 to move to one side to the limit, the two tapered plugs 211 are separated from the tapered pipe orifices matching the inner wall of the connecting pipe 2 to open the waterway. At this time, the atomizing nozzle 11 continuously sprays water mist outward. While the moving rod 21 moves to the limit, the rust-resistant spring 25 is compressed and deformed to prepare for the reverse movement and reset of the moving rod 21; When the trichlorofluoromethane in the evaporation cylinder block 3 is completely cooled and re-liquefied, the first piston rod 31 can retract. At this time, the flowing water continuously impacts the conical plug 211 to move in the other direction. At the same time, the rust-resistant spring 25 extends and presses the conical plug 211 to enhance the reset rate. While the two groups of conical plugs 211 and the moving rod 21 are moving in reset, the lever 23 synchronously drives the second piston rod 51 in the delay component to move in reset inside the delay cylinder block 5. Since the inner cavity of the delay cylinder block 5 is filled with a viscous anti-freezing damping liquid, when the second piston rod 51 resets, the viscous anti-freezing damping liquid on one side continuously flows from the first conical hole 52 to the other side of the second piston rod 51. Since the number of the first conical holes 52 is much less than that of the second conical holes 53, the reset rate of the second piston rod 51 extending outward is much lower than its retracting rate. Thus, the reset closing rate of the conical plug 211 is slowed down, achieving the effect of delaying the closing of the waterway; In summary, the device can sense the construction vibration in real time through the swing arm 33 in the triggering mechanism, drive the evaporation and pressurization of trichlorofluoromethane by the friction heat generation of the multi-ring sleeve 32, and only orientally open the local atomizing nozzles 11 in the dust area, eliminating the ineffective spraying in the non-operation area and non-construction period, and solving the "flood irrigation" - type waste of traditional devices from the root cause, significantly improving the water resource utilization efficiency; After the vibration stops, the flow-limiting characteristic of the viscous anti-freezing damping liquid in the delay component is used to cooperate with the second piston rod 51 and the delay cylinder block 5 to slow down the waterway closing rate, so that the spraying gradually stops within a short time, which not only ensures the full settlement of the residual dust, but also avoids the soil being too wet caused by continuous water spraying, and avoids the repeated water spraying of "stopping immediately"; In addition, the accurately controlled spraying mode can keep the humidity of the foundation pit surface within a safe range. Cooperating with the drainage design of the construction site, it can effectively keep the ground dry and firm, improve the safety of personnel operation and the passing efficiency of engineering vehicles, and solve the problem of muddying of the site caused by traditional dust reduction methods.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foundation pit dust suppression device for municipal engineering construction, including a water delivery pipe (1) and a plurality of connecting pipes (2) threadedly connected at equal intervals on the horizontal outer wall of one side thereof, characterized in that: A trigger mechanism is fixed to the outer wall of the top end of the connecting pipe (2) for converting the vibration of the construction site into power for opening and closing the water passage inside the connecting pipe (2). The trigger mechanism includes an evaporation cylinder body (3) fixed to one side of the outer wall of the top end of the connecting pipe (2). A first piston rod (31) is slidably installed inside the evaporation cylinder body (3). A concave liquid groove is formed at the center position of the outer wall on one side of the first piston rod (31). A multi-ring sleeve (32) is inserted through the inner wall of the evaporation cylinder body (3). A swing arm (33) is fixed to the center position of the outer wall on the side of the multi-ring sleeve (32) away from the first piston rod (31). A first gear (34) is fixed to the center position of the side of the swing arm (33) away from the multi-ring sleeve (32). The cavity formed by the evaporation cylinder body (3) and the first piston rod (31) is filled with trichlorofluoromethane with the physical properties of low boiling point and high melting point. The outer wall of the first gear (34) is engaged with an auxiliary swing assembly for driving the multi-ring sleeve (32) to reciprocate bidirectionally.

2. The dust reduction device for foundation pits used in municipal engineering construction according to claim 1, characterized in that: The multi-ring sleeve (32) is integrally concentrically multi-ring shaped. A concentric circular ring groove with matching size and shape is formed at the contact position between the inner wall of the first piston rod (31) and the multi-ring sleeve (32). The evaporation cylinder body (3) and the multi-ring sleeve (32) are both made of beryllium copper, a metal with good wear resistance, high strength and good thermal conductivity.

3. A foundation pit dust reduction device for municipal engineering construction according to claim 1, characterized in that: The auxiliary swing assembly includes a support rod (4) fixed to the outer wall of the top end of the connecting pipe (2). A second gear (41) is rotatably installed on one side of the outer wall of the top end of the support rod (4). A torsion spring is sleeved on the outer wall of the rotating shaft at the center of the second gear (41). The two ends of the torsion spring are respectively fixed to the second gear (41) and the support rod (4). The support rod (4) is engaged with the first gear (34).

4. A foundation pit dust reduction device for municipal engineering construction according to claim 3, characterized in that: A moving rod (21) is slidably installed at the central axis position inside the connecting pipe (2) through a plurality of groups of limiting frames. Both ends of the inner wall of the connecting pipe (2) are tapered. Tapered plugs (211) for matching the size of the tapered openings at both ends of the inner wall of the connecting pipe (2) are fixed to both ends of the moving rod (21).

5. A foundation pit dust reduction device for municipal engineering construction according to claim 4, characterized in that: Circular grooves are formed at the center positions of the outer walls on the sides of the two tapered plugs (211) close to the water delivery pipe (1). A limiting piece (22) is fixed to the position of the inner wall of the connecting pipe (2) close to the water delivery pipe (1). A T-shaped rod (212) that slides through the center of the limiting piece (22) is fixed at the center position of the circular groove of one of the tapered plugs (211). A rust-resistant spring (25) for providing auxiliary force for the lateral movement and reset of the moving rod (21) to close the water passage is sleeved on the outer wall of the T-shaped rod (212). The two ends of the rust-resistant spring (25) are respectively in contact with the outer wall of the limiting piece (22) and the inner wall of the circular groove of the tapered plug (211).

6. The dust reduction device for foundation pits used in municipal engineering construction according to claim 4, characterized in that: A lever (23) is fixed to the outer wall at the middle position of the moving rod (21). The lever (23) penetrates upward through the connecting pipe (2). One end of the outer wall of the top end of the lever (23) is rotatably connected to one end of the first piston rod (31). Two groups of curved tile-shaped pieces (24) are sequentially fixed to the upper and lower parts of the outer wall of the lever (23).

7. A foundation pit dust reduction device for municipal engineering construction according to claim 6, characterized in that: A through groove with a matching size is provided at the contact position between the outer wall of the top end of the connecting pipe (2) and the lever (23) and its transverse movement path, and two sets of tile-shaped pieces (24) are respectively tightly attached to the outer wall and the inner wall of the connecting pipe (2).

8. A foundation pit dust suppression device for municipal engineering construction according to claim 1, characterized in that: A delay component for extending the water path closing time is fixed on the outer wall of the top end of the connecting pipe (2) and close to the water delivery pipe (1). The delay component includes a delay cylinder body (5) fixed on the outer wall of the top end of the connecting pipe (2). A second piston rod (51) is slidably installed inside the delay cylinder body (5). A plurality of first tapered holes (52) are arranged at equal angles around the center of the outer wall of one end of the second piston rod (51). A plurality of second tapered holes (53) are arranged at equal angles around the center of the outer wall of one end of the second piston rod (51). Both the first tapered holes (52) and the first tapered holes (52) are tapered through holes, and the first tapered holes (52) and the second tapered holes (53) are arranged in a ring-shaped staggered manner as a whole. The inside of the delay cylinder body (5) is filled with a viscous damping liquid.

9. A foundation pit dust suppression device for municipal engineering construction according to claim 1, characterized in that: The outer walls of the bottom ends of the evaporation cylinder body (3) and the delay cylinder body (5) are both slidably attached to the tile-shaped piece (24). Curved sliding grooves with matching sizes and shapes are provided at the sliding attachment positions of the evaporation cylinder body (3) and the delay cylinder body (5) with the tile-shaped piece (24).

10. A foundation pit dust suppression device for municipal engineering construction according to claim 1, characterized in that: The end of the connecting pipe (2) far from the water delivery pipe (1) is threadedly connected with a spray head (11). A counterweight (35) is slidably sleeved on the outer wall of the swing arm (33).

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