A foundation pit dust falling device for municipal engineering construction

Abstract

The application discloses a foundation pit dust falling device for municipal engineering construction and relates to the technical field of municipal engineering. The device comprises a water delivery pipe, multiple groups of connecting pipes which are screw-connected to the horizontal outer wall of the water delivery pipe at equal intervals, and a triggering mechanism which is fixed to the top end outer wall of the connecting pipe and is used for converting the vibration of the construction site into power for the opening and closing adjustment of the waterway inside the connecting pipe. The triggering mechanism comprises an evaporation cylinder which is fixed to one side of the top end outer wall of the connecting pipe. A first piston rod is slidably installed in the evaporation cylinder, and a concave liquid groove is formed in the circumferential position of one side of the outer wall of the first piston rod. The application can realize real-time sensing of the construction vibration through the swing arm in the triggering mechanism, drive the frictional heating of the multi-ring sleeve pipe, drive the evaporation and pressure increase of chlorofluoromethane, and only open the local atomizing spray head in the dust raising area, so that the invalid spraying in the non-working area and non-construction period is avoided, the water waste of the traditional equipment is solved from the source, and the water resource utilization efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of municipal engineering, in particular to a foundation pit dust falling device for municipal engineering construction. BACKGROUND

[0002] Municipal engineering refers to municipal facility construction engineering, municipal facilities refer to various buildings, structures and equipment and the like arranged in urban areas, town planning construction ranges, based on government responsibilities and obligations, and provide various buildings, structures and equipment and the like for residents with paid or free public products and services, and urban life supporting various public infrastructure construction belongs to the scope of municipal engineering, such as common urban roads, bridges and subways, such as various pipelines closely related to life: rainwater, sewage, water, water, power, telecommunications, heat and gas and the like, and construction of squares, urban greening and the like also belongs to the scope of municipal engineering.

[0003] However, dust is often generated during construction in the city, which is harmful to the health of the surrounding people and the natural environment, and in the foundation pit construction scene, the spray dust falling device realizes efficient dust falling by atomizing and spraying liquid to the dust area, the device usually uses fasteners to fix the water supply pipe on the top of the fence arranged around the edge of the foundation pit, and by opening the water supply pump, water is delivered to each atomizing nozzle through the water supply pipe at a constant water pressure, forming a uniform water mist curtain covering the foundation pit, in view of the problem of pressure decay at the end of the long water supply pipeline, the prior art often installs pressure balance valves or constant pressure water supply devices at intervals along the pipeline, and by means of the built-in pressure sensor, the water pressure change is monitored in real time, when the pressure fluctuation is detected, the valve opening degree is automatically adjusted or the pressure stabilizing component is started, so that stable water supply pressure is obtained for each spraying unit, thereby ensuring the consistency of the dust falling effect of the entire foundation pit area.

[0004] However, the existing foundation pit spray dust falling device still has some deficiencies, the existing foundation pit spray dust falling device adopts a global continuous spraying mode, and water mist is continuously sprayed into the foundation pit through the water supply pipe and the atomizing nozzle around the edge of the foundation pit, this working mode can realize the dust falling purpose, but is contradictory to the special requirement of the foundation pit construction on the stability of the site.

[0005] Firstly, continuous water spraying is easy to cause the soil in the foundation pit to have too high water content, causing the ground to be muddy and slippery, not only increasing the risk of people slipping and falling, but also possibly causing engineering vehicles to sink into the mud, affecting the construction progress, and at the same time, excessive water penetration may weaken the strength of the soil body of the foundation pit slope, threaten the stability of the foundation pit supporting structure, and cause collapse hazards.

[0006] Secondly, due to the inability to accurately identify the dust generation area, the existing device still maintains the spraying state during the non-construction period or the non-dust operation area, causing a large amount of water resource waste; when the construction personnel operates in the local area of the foundation pit, the global water spraying also interferes with the construction operation, reduces the work efficiency, and is difficult to meet the intelligent and fine requirements of the municipal engineering foundation pit dust fall.

[0007] In view of the above problems, it is urgent to carry out innovative design on the basis of the original spraying dust fall device. SUMMARY

[0008] The technical scheme of the present application provides a significantly different solution from the prior art to solve the problems raised in the background art.

[0009] To achieve the above object, the present application provides the following technical scheme: a foundation pit dust fall device for municipal engineering construction, comprising a water delivery pipe and a plurality of groups of connecting pipes connected to the outer wall of the water delivery pipe at equal intervals, a triggering mechanism is fixed to the top end of the outer wall of the connecting pipe for converting the vibration of the construction site into power for opening and closing adjustment of the waterway inside the connecting pipe;

[0010] The triggering mechanism comprises an evaporation cylinder body fixed to one side of the top end of the connecting pipe, a first piston rod is slidably installed in the evaporation cylinder body, a concave liquid groove is formed in the outer wall of one side of the first piston rod, a plurality of ring sleeve pipes are inserted into the inner wall of the evaporation cylinder body, a swing arm is fixed to the outer wall of one side of the plurality of ring sleeve pipes away from the first piston rod, a first gear is fixed to the outer wall of one side of the swing arm away from the plurality of ring sleeve pipes, and the cavity formed by the evaporation cylinder body and the first piston rod is filled with trifluoromethane with low boiling point and high melting point physical properties;

[0011] The outer wall of the first gear is engaged with an auxiliary swing assembly for driving the plurality of ring sleeve pipes to reciprocally rotate in two directions;

[0012] Preferably, the plurality of ring sleeve pipes are concentrically arranged, and a concentric circular groove with matching size and shape is formed in the contact position between the inner wall of the first piston rod and the plurality of ring sleeve pipes, the evaporation cylinder body and the plurality of ring sleeve pipes are made of beryllium copper, which is a metal with good wear resistance, high strength and good heat conductivity;

[0013] Preferably, the auxiliary swing assembly comprises a support rod fixed to the top end of the outer wall of the connecting pipe, a second gear is rotatably installed on one side of the top end of the outer wall of the support rod, a torsional spring is sleeved on the outer wall of the rotating shaft of the center of the second gear, and the two ends of the torsional spring are respectively fixed to the second gear and the support rod, and the support rod is engaged with the first gear;

[0014] Preferably, a movable rod is slidingly installed at the position of the central axis in the interior of the connecting pipe through multiple sets of limiting frames, both ends of the inner wall of the connecting pipe are tapered and closed, and both ends of the movable rod are fixedly provided with tapered plugs matched in size with the tapered and closed inner wall of the connecting pipe;

[0015] Preferably, annular grooves are formed at the position of the central part of the outer wall of one side of the connecting pipe close to the water delivery pipe, and a limiting sheet is fixed at the position of the connecting pipe close to the water delivery pipe, a T-shaped rod is fixed at the position of the center of the annular groove of one set of the tapered plugs, a rust-resistant spring is arranged on the outer wall of the T-shaped rod to provide auxiliary force for the horizontal movement of the movable rod and the closing of the water path, and both ends of the rust-resistant spring are in contact with the outer wall of the limiting sheet and the inner wall of the annular groove of the tapered plug.

[0016] Preferably, a push rod is fixedly arranged at the position of the outer wall of the movable rod, the push rod penetrates the connecting pipe upward, one end of the push rod is rotationally connected with the first piston rod, and two sets of curved tile-shaped sheets are fixedly arranged on the outer wall of the push rod in sequence.

[0017] Preferably, a through groove matched in size is formed at the position of the outer wall of the top end of the connecting pipe in contact with the push rod and the horizontal movement path of the push rod, and the two sets of tile-shaped sheets are closely attached to the outer wall and the inner wall of the connecting pipe, respectively.

[0018] Preferably, a delay mechanism for prolonging the closing time of the water path is fixedly arranged at the position of the outer wall of the top end of the connecting pipe close to the water delivery pipe.

[0019] The delay mechanism comprises a delay cylinder fixedly arranged at the outer wall of the top end of the connecting pipe, a second piston rod slidingly installed in the interior of the delay cylinder, a plurality of first tapered holes formed at the position of the outer wall of one end of the second piston rod at equal angles around the center, a plurality of second tapered holes formed at the position of the outer wall of one end of the second piston rod at equal angles around the center, the first tapered holes and the second tapered holes being tapered perforations, and the first tapered holes and the second tapered holes being annularly and staggeredly arranged, and the interior of the delay cylinder being filled with viscous damping liquid.

[0020] Preferably, the bottom ends of the evaporation cylinder and the delay cylinder are slidingly attached to the tile-shaped sheets, and the evaporation cylinder and the delay cylinder are provided with curved sliding grooves matched in size and shape at the positions of the sliding attachment of the tile-shaped sheets.

[0021] Preferably, an atomizing nozzle is threadedly connected to the end of the connecting pipe away from the water delivery pipe, and a counterweight is slidingly sleeved on the outer wall of the swing arm.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The device triggers the swing arm in the mechanism to sense the construction vibration in real time, and the linkage multi-ring sleeve pipe generates heat by friction to drive the trichlorofluoromethane evaporation and pressurization. Only the local atomizing nozzle is opened in the dust area, and invalid spraying in the non-working area and non-construction period is avoided, which solves the waste of traditional equipment "flood irrigation" and significantly improves the utilization efficiency of water resources.

[0024] 2. When the vibration stops, the second piston rod and the delay cylinder body are used to slow down the closing speed of the waterway by using the flow limiting characteristics of the viscous frozen damping liquid in the delay assembly, so that the spraying is gradually stopped in a short time, which not only ensures that the residual dust is fully settled, but also avoids the over-wetting of the soil caused by continuous water spraying, and avoids the repeated water spraying of "stop immediately";

[0025] In addition, the precise spraying mode can maintain the surface humidity of the foundation pit within a safe range, cooperate with the drainage design of the construction site, effectively keep the ground dry and solid, improve the safety of personnel operation and the efficiency of engineering vehicle passing, and solve the problem of muddy site caused by traditional dust reduction method. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of the device of the present application.

[0027] Figure 2 It is a partial cross-sectional view of the connecting pipe of the present application.

[0028] Figure 3 It is a plan view and a local enlarged detail view of the present application.

[0029] Figure 4 It is a plan view of the device of the present application.

[0030] Figure 5 It is a plan view of the device of the present application and a local enlarged detail view.

[0031] Figure 6 It is a cutaway plan view of the device of the present application.

[0032] Figure 7 It is an enlarged detail view of A in the present application. Figure 6

[0033] Figure 8 It is a sectional view of the second piston rod of the present application.

[0034] Figure 9 It is an end face plan view of the second piston rod of the present application.

[0035] Figure 10 It is an internal explosion disassembly and a local enlarged view of the connecting pipe of the present application.

[0036] Figure 11 It is a detailed view of the evaporation closed cylinder and the first piston rod connecting structure of the present application.​

[0037] Figure 12 Figure 1 is a first piston rod structure detail view of the present application.

[0038] Figure 1 is a first piston rod structure detail view of the present application.

[0039] 2, connecting pipe; 21, moving rod; 211, conical plug; 212, T-shaped rod; 22, limiting sheet; 23, pulling rod; 24, tile-shaped sheet; 25, corrosion-resistant spring;

[0040] 3, evaporation cylinder; 31, first piston rod; 32, multi-ring sleeve; 33, swing arm; 34, first gear; 35, counterweight;

[0041] 4, support rod; 41, second gear;

[0042] 5, delay cylinder; 51, second piston rod; 52, first conical hole; 53, second conical hole. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Please refer to Figures 1 to 12 The present application provides a technical solution: a foundation pit dust falling device for municipal engineering construction, comprising a water delivery pipe 1 and multiple groups of connecting pipes 2 connected to the outer wall of the water delivery pipe 1 at equal intervals, and a triggering mechanism fixed to the top end of the connecting pipe 2 for converting the vibration of the construction site into power for opening and closing adjustment of the waterway inside the connecting pipe 2.

[0045] The triggering mechanism comprises an evaporation cylinder 3 fixed to one side of the top end of the connecting pipe 2, a first piston rod 31 slidably installed inside the evaporation cylinder 3, a concave liquid groove formed in the center of one side of the outer wall of the first piston rod 31, a multi-ring sleeve 32 inserted into the inner wall of the evaporation cylinder 3, a swing arm 33 fixed to the center of one side of the outer wall of the multi-ring sleeve 32 away from the first piston rod 31, a first gear 34 fixed to the center of one side of the swing arm 33 away from the multi-ring sleeve 32, and a cavity formed by the evaporation cylinder 3 and the first piston rod 31 filled with trichlorofluoromethane with low boiling point and high melting point physical properties.

[0046] 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.

[0047] As a further implementation of the present application, the multi-ring sleeve 32 is in the shape of a concentric multi-ring, and a circular groove matching in size and shape is formed on the inner wall of the first piston rod 31 at the position where the multi-ring sleeve 32 is in contact with the first piston rod 31, and the evaporating cylinder 3 and the multi-ring sleeve 32 are made of beryllium copper, which is a metal with good wear resistance, high strength and good thermal conductivity;

[0048] In the embodiment, the multi-ring sleeve 32 in the shape of a concentric multi-ring is fully attached to the evaporating cylinder 3, and when the multi-ring sleeve 32 rotates, heat is generated by friction at the contact surface, and the beryllium copper has good thermal conductivity, so that 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.

[0049] As a further implementation of the present application, 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 rotatably mounted on one side of the outer wall of the top end of the support rod 4, a torsional spring sleeved on the outer wall of the rotating shaft at the center of the second gear 41, and the two ends of the torsional spring are fixed to the second gear 41 and the support rod 4 respectively, and the support rod 4 is engaged with the first gear 34.

[0050] In the embodiment, when the swing arm 33 swings up and down due to the vibration of the site, the first gear 34 engages with the second gear 41 to rotate, and since the transmission ratio of the first gear 34 to the second gear 41 is about two to one, the small amplitude swing of the swing arm 33 is amplified by the gear set and simultaneously tightens the torsional spring to store energy. When the swing arm 33 reversely rotates to reset and swing, if the kinetic energy is insufficient, the torsional spring can provide a certain auxiliary assistance.

[0051] As a further implementation of the present application, a movable rod 21 is slidably mounted at the position of the central axis in the inner part of the connecting pipe 2 through a plurality of limiting frames, and the inner walls of the connecting pipe 2 at both ends are tapered and closed, and the two ends of the movable rod 21 are fixed with tapered plugs 211 matching in size with the tapered and closed inner walls of the connecting pipe 2.

[0052] In the embodiment, the left and right horizontal movement of the lever 23 driving the movable rod 21 can realize the operation of quickly opening and closing the waterway by using the two tapered plugs 211 in cooperation with the tapered and closed inner walls of the connecting pipe 2.

[0053] As a further implementation of the present application, annular grooves are formed at the center positions of the outer walls of the two tapered plugs 211 close to the water delivery pipe 1, and a limiting piece 22 is fixed to the inner wall of the connecting pipe 2 close to the water delivery pipe 1, and a T-shaped rod 212 is fixed at the center of the annular groove of one of the tapered plugs 211 and slidably penetrates through the center of the limiting piece 22, and a rust-resistant spring 25 is sleeved on the outer wall of the T-shaped rod 212 to provide auxiliary force for the movable rod 21 to horizontally move to reset and close the waterway, and the two ends of the rust-resistant spring 25 are in contact with the outer wall of the limiting piece 22 and the inner wall of the annular groove of the tapered plug 211 respectively.

[0054] In specific implementation, the annular groove of the conical plug 211 can increase the contact area of the active water flow, and the automatic reset of the conical plug 211 is realized by the continuous impact of the high-pressure active water flow on the conical plug 211 and the annular groove, thereby closing the water path. When the conical plug 211 is reset and transversely moved, the anti-rust spring 25 is reset and releases the elastic potential energy, thereby assisting the conical plug 211 to be reset and transversely moved.

[0055] As a further implementation of the present application, the middle position outer wall of the moving rod 21 is fixed with a push rod 23, the push rod 23 penetrates the connecting pipe 2 upward, the top end outer wall of the push rod 23 is rotatably connected with one end of the first piston rod 31, and two groups of curved tile-shaped pieces 24 are fixed on the outer wall of the push rod 23 in sequence.

[0056] In specific implementation, the two groups of curved tile-shaped pieces 24 are both curved tile-shaped, and a sealing ring is arranged at the position where the curved tile-shaped piece 24 contacts the surface (inner wall and outer wall) of the connecting pipe 2, so as to ensure the air tightness of the connecting pipe 2.

[0057] As a further implementation of the present application, a through groove with a size matched with the push rod 23 is arranged at the position where the top end outer wall of the connecting pipe 2 contacts the push rod 23 and the transverse movement path of the push rod 23, and the two groups of tile-shaped pieces 24 are tightly attached to the outer wall and the inner wall of the connecting pipe 2, respectively.

[0058] In specific implementation, the through groove arranged on the outer wall of the connecting pipe 2 is matched with the size of the push rod 23, and the two groups of tile-shaped pieces 24 with sealing rings can prevent the water flow in the connecting pipe 2 from leaking along the through groove.

[0059] As a further implementation of the present application, a delay mechanism for prolonging the water path closing time is fixed on the top end outer wall of the connecting pipe 2 and close to one side of the water delivery pipe 1.

[0060] The delay mechanism comprises a delay cylinder body 5 fixed on the top end outer wall of the connecting pipe 2, a second piston rod 51 slidably installed in the delay cylinder body 5, a plurality of groups of first conical holes 52 arranged at equal angles around the center of the outer wall of one end of the second piston rod 51, a plurality of groups of second conical holes 53 arranged at equal angles around the center of the outer wall of one end of the second piston rod 51, the first conical holes 52 and the second conical holes 53 are both conical holes, and the first conical holes 52 and the second conical holes 53 are arranged in an annular staggered manner, and the delay cylinder body 5 is filled with viscous damping liquid.

[0061] In a specific implementation, when the first piston rod 31 is extended, the second piston rod 51 is simultaneously retracted, and when the second piston rod 51 is retracted, the viscous damping liquid in the delay cylinder 5 flows from one side to the other side through the plurality of first tapered holes 52, and vice versa, when the second piston rod 51 is extended, the viscous damping liquid flows from the other side to the one side through the plurality of second tapered holes 53, wherein the first tapered holes 52 and the second tapered holes 53 are annularly staggered and oppositely tapered, the number of the first tapered holes 52 is much larger than the number of the second tapered holes 53, so that the speed of the second piston rod 51 retraction is faster than the speed of the second piston rod 51 extension, thereby the time required for the cooling and liquefaction of the trichlorofluoromethane is added to the delay of the reset of the lever 23.

[0062] As a further embodiment of the present application, the bottom end outer wall of the evaporation cylinder 3 and the delay cylinder 5 is in sliding fit with the tile-shaped piece 24, and the evaporation cylinder 3 and the delay cylinder 5 are provided with curved sliding grooves at the sliding fit positions with the tile-shaped piece 24.

[0063] In a specific implementation, the curved sliding grooves can strengthen the tile-shaped piece 24 and prevent the tile-shaped piece 24 from loosening and causing water leakage in the connecting pipe 2.

[0064] As a further embodiment of the present application, the end of the connecting pipe 2 away from the water pipe 1 is threadedly connected with the atomizing nozzle 11, and the outer wall of the swing arm 33 is slidingly sleeved with the counterweight 35.

[0065] In a specific implementation, the outer wall of the swing arm 33 is slidingly sleeved with the counterweight 35, and the counterweight 35 is fixed to the swing arm 33 by the bolt, and the swing range of the swing arm 33 can be adjusted by adjusting the position of the counterweight 35.

[0066] Working principle: first, when the swing arm 33 in the trigger mechanism senses the vibration and starts to swing, the swing arm 33 drives the multi-ring sleeve pipe 32 to rotate, and a large amount of heat is generated due to the continuous friction between the multi-ring sleeve pipe 32 and the corresponding ring groove in the inner wall of the evaporation cylinder 3, then the heat is transmitted and heated through the beryllium copper layer in the inner wall of the evaporation cylinder 3, the beryllium copper material has high thermal conductivity and strength, and the trichlorofluoromethane in the closed cavity formed by the evaporation cylinder 3 and the multi-ring sleeve pipe 32 is heated, the liquid is also known as R11, the melting point is -111℃, and the boiling point is 23.7℃, then the trichlorofluoromethane is evaporated and the pressure in the cavity is continuously increased, the first piston rod 31 is extended out of the evaporation cylinder 3 and drives the lever 23 and the second piston rod 51 to move synchronously;

[0067] Wherein, the swing arm 33 starts to rotate clockwise with the construction site vibration, and drives the first gear 34 in the auxiliary swing assembly to rotate synchronously, the first gear 34 engages to drive the second gear 41 to rotate counterclockwise, the second gear 41 rotates at the same time to tighten the torsional spring, when the torsional spring is twisted to the limit, it drives the second gear 41 and the first gear 34 to reverse rotation, the first gear 34 drives the swing arm 33 and the multi-ring sleeve pipe 32 to rotate counterclockwise, so it continuously reciprocates until the "kinetic energy" is exhausted and stops, wherein the "kinetic energy" includes the kinetic energy of the swing arm 33 swinging up and down due to the site vibration and the elastic potential energy stored when the torsional spring is tightened;

[0068] When the two groups of tapered plugs 211 and the tapered pipe openings matched with the inner wall of the connecting pipe 2 are separated to open the waterway, the valve-shaped pieces 24, the movable rod 21 and the tapered plugs 211 are moved to the limit, at this time the atomizing nozzle 11 continuously sprays water mist outward, the anti-rust spring 25 is extruded and deformed at the same time the movable rod 21 moves to the limit and prepares for reverse movement and resetting of the movable rod 21;

[0069] When the trichlorofluoromethane in the evaporation cylinder 3 is completely cooled and re-liquefied, the first piston rod 31 can be retracted, at this time the flowing water flow continuously impacts the tapered plug 211 to move to the other side, at the same time the anti-rust spring 25 stretches and extrudes the tapered plug 211 to strengthen the resetting rate, when the two groups of tapered plugs 211 and the movable rod 21 reset, the second piston rod 51 in the delay assembly is synchronously driven by the push rod 23 to reset in the delay cylinder 5, because the inner cavity of the delay cylinder 5 is filled with viscous antifreeze damping liquid, when the second piston rod 51 resets, the viscous antifreeze damping liquid on one side continuously flows from the first tapered hole 52 to the other side of the second piston rod 51, because the number of the first tapered hole 52 is far less than that of the second tapered hole 53, therefore the resetting rate of the second piston rod 51 extending out is far lower than that of the retraction rate, thus slowing down the rate of the tapered plug 211 resetting and closing, achieving the effect of delaying the closing of the waterway;

[0070] As described above, the device senses the construction vibration in real time through the swing arm 33 in the trigger mechanism, links the multi-ring sleeve pipe 32 to generate heat by friction to drive the trichlorofluoromethane to evaporate and pressurize, only opens the local atomizing nozzle 11 in the dust area, eliminates invalid spraying in the non-working area and non-construction period, solves the traditional device "flood irrigation" waste from the root, and significantly improves the water resource utilization efficiency;

[0071] When the vibration stops, the second piston rod 51 and the delay cylinder 5 slow down the waterway closing rate by using the flow limiting characteristics of the viscous freezing damping liquid in the delay assembly, so that the spray gradually stops in a short time, which not only ensures that the residual dust is fully settled, but also avoids the soil over-wetting caused by continuous water spraying, and avoids repeated water spraying;

[0072] In addition, the precise spraying mode can maintain the surface humidity of the foundation pit in a safe range, cooperate with the drainage design of the construction site, effectively keep the ground dry and solid, improve the safety of personnel operation and the passing efficiency of engineering vehicles, and solve the muddy problem caused by the traditional dust reduction method.

[0073] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, as long as the modifications, equivalent replacements, improvements, etc. are within the spirit and principles of the present application, which should be included in the protection scope of the present application.

Claims

1. A foundation pit dust falling device for municipal engineering construction, comprising a water delivery pipe (1) and multiple groups of connecting pipes (2) connected to the horizontal outer wall of one side of the water delivery pipe (1) at equal intervals, characterized in that: The top end outer wall of the connecting pipe (2) is fixed with a trigger mechanism for converting the vibration of the construction site into power for opening and closing adjustment of the waterway inside the connecting pipe (2); The trigger mechanism comprises an evaporation cylinder (3) fixed on one side of the top end outer wall of the connecting pipe (2), a first piston rod (31) is slidably arranged in the evaporation cylinder (3), a concave liquid groove is formed in the center of one side of the outer wall of the first piston rod (31), a plurality of ring sleeve pipes (32) are penetratingly arranged on the inner wall of the evaporation cylinder (3), a swing arm (33) is fixed on the center of one side of the outer wall of the evaporation cylinder (3) away from the ring sleeve pipe (32), a first gear (34) is fixed on the center of one side of the swing arm (33) away from the ring sleeve pipe (32), and the cavity formed by the evaporation cylinder (3) and the first piston rod (31) is filled with trichlorofluoromethane with low boiling point and high melting point physical properties. The outer wall of the first gear (34) is engaged with an auxiliary swing assembly for driving the ring sleeve pipe (32) to reciprocating rotate bidirectionally. The ring sleeve pipe (32) is in the shape of concentric multi-ring, and a concentric circular groove with matching size and shape is formed in the contact position between the inner wall of the first piston rod (31) and the ring sleeve pipe (32), and the evaporation cylinder (3) and the ring sleeve pipe (32) are made of beryllium copper, which is a kind of metal with good wear resistance, high strength and good heat conductivity. A movable rod (21) is slidably arranged at the inner central axis of the connecting pipe (2) through a plurality of limiting frames, both ends of the inner wall of the connecting pipe (2) are tapered, and tapered plugs (211) with sizes matching the tapered inner wall of the connecting pipe (2) are fixed on both ends of the movable rod (21). A lever (23) is fixed on the outer wall of the movable rod (21) at the middle position, the lever (23) penetrates the connecting pipe (2) upward, one end of the outer wall of the top end of the lever (23) is rotatably connected with one end of the first piston rod (31), and two groups of curved tile pieces (24) are fixed on the outer wall of the lever (23) in sequence.

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

3. The foundation pit dust falling device for municipal engineering construction according to claim 1, characterized in that: Ring grooves are formed in the center of one side of the outer wall of both tapered plugs (211) close to the water delivery pipe (1), a limiting piece (22) is fixed on the inner wall of the connecting pipe (2) close to the water delivery pipe (1), a T-shaped rod (212) is fixed in the ring groove of one of the tapered plugs (211) at the center of the inner circle, the T-shaped rod (212) penetrates the center of the limiting piece (22) slidably, a rust-resistant spring (25) is sleeved on the outer wall of the T-shaped rod (212) for providing auxiliary force for the horizontal movement of the movable rod (21) to reset and close the waterway, and both ends of the rust-resistant spring (25) are in contact with the outer wall of the limiting piece (22) and the inner wall of the ring groove of the tapered plug (211) respectively.

4. The foundation pit dust falling device for municipal engineering construction of claim 1, characterized in that: The top end outer wall of the connecting pipe (2) is provided with a through slot matching in size at the position where the push rod (23) and its horizontal moving path contact, and two groups of tile-shaped pieces (24) are tightly attached to the outer wall and the inner wall of the connecting pipe (2) respectively.

5. The foundation pit dust falling device for municipal engineering construction according to claim 1, characterized in that: A delay component for prolonging the waterway closing time is fixed to the top end outer wall of the connecting pipe (2) and close to one side of the water delivery pipe (1); The delay component comprises a delay cylinder body (5) fixed to the top end outer wall of the connecting pipe (2), a second piston rod (51) is slidingly installed in the delay cylinder body (5), a plurality of groups of first conical 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 groups of second conical holes (53) are arranged at equal angles around the center of the outer wall of one end of the second piston rod (51), the first conical holes (52) and the second conical holes (53) are both conical holes, and the first conical holes (52) and the second conical holes (53) are annularly and alternately arranged, and the delay cylinder body (5) is filled with viscous damping liquid.

6. The foundation pit dust falling device for municipal engineering construction of claim 1, characterized in that: The bottom end outer walls of the evaporation cylinder body (3) and the delay cylinder body (5) are slidingly attached to the tile-shaped pieces (24), and the evaporation cylinder body (3) and the delay cylinder body (5) are provided with curved sliding grooves matching in size and shape at the positions where they are slidingly attached to the tile-shaped pieces (24).

7. The foundation pit dust falling device for municipal engineering construction of claim 1, characterized in that: The connecting pipe (2) is threadedly connected with an atomizing nozzle (11) at the end away from the water delivery pipe (1), and a counterweight (35) is slidingly sleeved on the outer wall of the swing arm (33).

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