Noise reduction device for construction sites

Abstract

The utility model provides a kind of noise reduction device for construction site, including installation frame and sound-absorbing board, installation frame is formed by installation pole splicing;The installation frame forms at least two containing area for containing sound-absorbing board;The installation pole between adjacent two containing areas includes the first bar portion, the second bar portion of each other rotation connection;The first bar portion, the second bar portion cooperate with each other, to form the installation pole;The first bar portion is equipped with the first installation slot for installing sound-absorbing board, the second bar portion is equipped with the second installation slot for installing sound-absorbing board;When the first bar portion is rotated relative to second bar portion, the first installation slot axial direction, the second installation slot axial direction between the included angle variation range is [θ1,θ2], wherein, θ2-θ1=5°.

Description

TECHNICAL FIELD

[0001] The utility model relates to building site equipment technical field, concretely is a noise reduction device, namely is used for the noise reduction of building site. BACKGROUND

[0002] With the increasing number and scale of building sites, the environmental problems brought thereby are increasingly serious, among which, dust raising, noise and the like are common environmental pollution problems of building sites.

[0003] As extremely important construction operations of building sites: muck transportation, drilling operation, blasting excavation and the like, a large amount of noise and the like will be generated, which has adverse effects on the surrounding environment and the physical health of construction personnel and cannot meet the green construction requirements of the construction industry.

[0004] The patent application with the patent publication number CN218405875U discloses a noise reduction and sound elimination barrier for building site, wherein two sound insulation boards are connected with each other through a clamping mechanism, thereby forming a larger sound insulation area. However, the angle between the two sound insulation boards cannot be adjusted.

[0005] When setting the noise reduction device for the noise generating machine, the included angle of the two sound insulation boards is generally set according to the actual machine occupied area shape around the machine. However, due to the unpredictability in actual construction, for example, tools or other equipment are piled beside the machine, the actual requirement for the included angle of the two adjacent sound insulation boards may be slightly greater than the pre-designed angle, so that the two sound insulation boards with the fixed included angle pre-designed cannot be used, which affects the construction efficiency, and even may cause the waste of sound insulation boards. UTILITY MODEL CONTENT

[0006] The utility model solves the problems in the background art, and provides a noise reduction device for building site.

[0007] To solve the above technical problems, the utility model adopts the technical scheme of a noise reduction device for building site, comprising a mounting frame for being arranged at the building site and a sound elimination board (4), wherein the mounting frame is formed by splicing mounting rods (1); the mounting frame forms at least two containing areas for containing the sound elimination board (4) / sound elimination board support structure;

[0008] Among them, the mounting rod (1) between the two adjacent containing areas comprises a first rod part (1A) and a second rod part (1B) which are rotatably connected with each other; the first rod part (1A) and the second rod part (1B) are matched with each other, thereby forming the mounting rod (1);

[0009] The first rod part (1A) is provided with a first mounting slot (11) for mounting a sound-absorbing plate (4) / sound-absorbing plate support structure, and the second rod part (1B) is provided with a second mounting slot (12) for mounting a sound-absorbing plate (4) / sound-absorbing plate support structure.

[0010] When the first rod part (1A) rotates relative to the second rod part (1B), the included angle between the opening direction of the first mounting slot (11) and the opening direction of the second mounting slot (12) changes in the range of [θ1, θ2], wherein θ1 is a first angle value, θ2 is a second angle value, and θ2-θ1≥5°.

[0011] By adopting the above technical scheme, the mounting rod is spliced to form a mounting frame, which facilitates the positioning of the sound-absorbing plate inside the mounting frame (i.e., inside the polygon), thereby achieving the effect of noise blocking and reducing the noise impact of the construction site on the surrounding environment. By adopting the above technical scheme, the included angle of the sound-absorbing plate / sound-absorbing plate support structure accommodated in the at least two accommodation areas can be adjusted, thereby adapting to the noise reduction needs of different area shapes and achieving better noise blocking effect. Moreover, since the two accommodation areas have a common mounting rod as a common side, the installation of two or more sound-absorbing plates / sound-absorbing plate support structures is more convenient. In the utility model, the sound-absorbing plate can be directly installed in the mounting slot (first mounting slot or second mounting slot) and positioned by the mounting slots surrounding the same accommodation area, or a sound-absorbing plate support structure (such as a support plate) is installed in the mounting slot, the sound-absorbing plate support structure is positioned by the mounting slots surrounding the same accommodation area, and the sound-absorbing plate is arranged on the sound-absorbing plate support structure.

[0012] Further, the first rod part (1A), the second rod part (1B), the first mounting slot (11), and the second mounting slot (12) all extend in the length direction of the mounting rod (1); the opening direction of the first mounting slot (11) and the opening direction of the second mounting slot (12) are both perpendicular to the length direction of the mounting rod (1).

[0013] The sound-absorbing plate (4) / sound-absorbing plate support structure installed in the first mounting slot (11) is positioned in one of the two adjacent accommodation areas;

[0014] The sound-absorbing plate (4) / sound-absorbing plate support structure installed in the second mounting slot (12) is positioned in the other of the two adjacent accommodation areas.

[0015] Further, 15°≤θ2-θ1≤90°.

[0016] Further, 45°≤θ1≤135°.

[0017] Further, at least N-3 connecting rods (3) are arranged on the mounting frame; each end of each connecting rod (3) is connected to the connecting position of two adjacent mounting rods (1);

[0018] The at least N-3 connecting rods (3) divide the polygon inner space into at least N-2 subspaces, each of which is a triangle, N is the number of edges of the polygon, and N≥4.

[0019] By using the connecting rods, the subspaces divided by the mounting frame of the polygon are all triangles with stable structure, so that the overall structure of the mounting frame is stable.

[0020] Further, the noise reduction device further comprises a first connecting piece (2) for connecting adjacent mounting rods (1), the first connecting piece (2) comprises a connecting piece body (23) and mounting sleeves (21) arranged on the connecting piece body (23), the number of the mounting sleeves (21) is not less than the number of the mounting rods (1) connected to the first connecting piece (2); the mounting rod (1) extends into the corresponding mounting sleeve (21) or is sleeved outside the mounting sleeve (21) to be connected with the first connecting piece (2); or

[0021] The adjacent mounting rods (1) are connected in a hinged manner; or

[0022] The noise reduction device further comprises a second connecting piece (8); the mounting rod (1) is provided with a mounting protrusion (22), the second connecting piece (8) has a first limiting section (81) and a second limiting section (82) for limiting two adjacent mounting protrusions (22) respectively; when the two adjacent mounting rods (1) are connected, the mounting protrusions (22) of the two adjacent mounting rods (1) are connected through the second connecting piece (8).

[0023] By using the above technical solution, the adjacent mounting rods can be connected with each other through the mounting sleeves of the first connecting piece, or connected with each other in a hinged manner.

[0024] Further, at least one first connecting piece (2) has at least two mounting sleeves (21), and the first connecting piece (2) forms an L-shaped structure as a whole; or

[0025] At least one first connecting piece (2) has at least three mounting sleeves (21), and the first connecting piece (2) forms a T-shaped structure or a Y-shaped structure as a whole; or

[0026] At least one first connecting piece (2) has at least four mounting sleeves (21), and the first connecting piece (2) forms a cross-shaped structure as a whole.

[0027] By adopting the technical scheme, when K is greater than or equal to 3, a mounting frame in a polygon shape is formed, and then more connecting rods can be connected by using the unused sleeves outside the polygon, so that a noise blocking structure with a larger area is combined, and the noise blocking structure is suitable for construction sites of different sizes and shapes.

[0028] Further, the mounting rod (1) for forming the common side comprises a first rod part (1A) and a second rod part (1B) arranged correspondingly; the first rod part (1A) has a protruding structure (13), and the second rod part (1B) has a groove (14) matched with the protruding structure (13).

[0029] The first rod part (1A) and the second rod part (1B) are rotationally connected through the cooperation of the protruding structure (13) and the groove (14). The first rod part (1A) and the second rod part (1B) extend in the length direction of the mounting rod (1).

[0030] By adopting the technical scheme, the protruding structure is matched with the groove, so that the first rod part and the second rod part are connected with each other to form the mounting rod.

[0031] Further, the first rod part (1A) comprises a mounting base (15) and the protruding structure (13) arranged on the mounting base (15); the mounting base (15) and the protruding structure (13) are fixedly connected with each other or are an integral structure.

[0032] Further, the mounting base (15) and the protruding structure (13) are connected through an extension section (16).

[0033] The mounting base (15), the extension section (16) and the protruding structure (13) enclose a first limiting groove (18A) and a second limiting groove (18B).

[0034] The first limiting groove (18A) and the second limiting groove (18B) are respectively located on two sides of the extension section (16).

[0035] The groove (14) of the second rod part (1B) forms a first protrusion (17A) and a second protrusion (17B) on two sides thereof.

[0036] The first rod part (1A) and the second rod part (1B) have a first connection state, a second connection state and a third connection state.

[0037] When the first rod part (1A) and the second rod part (1B) are in the first connection state, the first protrusion (17A) extends into the first limiting groove (18A), the first protrusion (17A) is in contact with the mounting base (15) and / or in contact with the extension section (16), and gaps exist between the second protrusion (17B) and the mounting base (15) and between the second protrusion (17B) and the extension section (16);

[0038] When the first rod part (1A) and the second rod part (1B) are in the second connection state, the second protrusion (17B) extends into the second limiting groove (18B), the second protrusion (17B) is in contact with the mounting base (15) and / or in contact with the extension section (16), and gaps exist between the first protrusion (17A) and the mounting base (15) and between the first protrusion (17A) and the extension section (16);

[0039] When the first rod part (1A) and the second rod part (1B) are in the third connection state, gaps exist between the first protrusion (17A) and the mounting base (15), between the first protrusion (17A) and the extension section (16), between the second protrusion (17B) and the mounting base (15), and between the second protrusion (17B) and the extension section (16).

[0040] By adopting the above technical scheme, when the first rod part and the second rod part are in the first connection state and the second connection state respectively, the first rod part and the second rod part are limited to each other, that is, the first rod part rotates to the first limit position and the second limit position relative to the second rod part, and when in the third connection state, the position is between the two limit positions. Through the above arrangement, the first rod part can rotate between the first limit position and the second limit position relative to the second rod part, so as to adjust the included angle between the first groove opening direction and the second groove opening direction, and thus adjust the included angle between the sound-absorbing plates limited by the first groove and the sound-absorbing plates limited by the second groove, which is suitable for different installation occasions.

[0041] Further, the noise reduction device further comprises a first connecting piece (2) for connecting adjacent mounting rods (1), the first connecting piece (2) comprises a connecting piece main body (23) and a mounting sleeve (21) arranged on the connecting piece main body (23), the mounting rod (1) extends into or is sleeved outside the mounting sleeve (21), so as to be connected with the first connecting piece (2);

[0042] The size of the protruding structure (13) is greater than the size of the mounting base (15) and the size of the second rod part (1B) in the length direction of the mounting rod (1), so that when the first rod part (1A) and the second rod part (1B) are connected to each other, the two ends of the protruding structure (13) in the length direction of the mounting rod (1) respectively extend into the mounting sleeve (21) of the corresponding first connecting piece (2), thereby cooperating with the corresponding first connecting piece (2).

[0043] By adopting the above technical scheme, the two ends of the protruding structure in the length direction of the mounting rod extend into the two mounting sleeves of the two first connecting pieces, thereby cooperating with the two corresponding first connecting pieces.

[0044] Further, the outer wall of the protruding structure (13) has a curved surface; and the groove (14) is an arc-shaped groove in interference fit with the curved surface.

[0045] By adopting the above technical scheme, the connection between the protruding structure and the groove is more stable.

[0046] Further, the size of the curved surface of the protruding structure (13) in the circumferential direction is greater than the size of the arc-shaped groove in the circumferential direction, so that:

[0047] When the protruding structure (13) is connected with the groove (14), at least part of the curved surface of the protruding structure (13) is located outside the second rod part (1B), that is, part of the curved surface of the protruding structure (13) is connected with the arc-shaped groove, while the other part of the curved surface is not connected with the arc-shaped groove, and the mounting base (15) abuts against the second rod part (1B) or has a gap therebetween, so that the protruding structure (13) of the first rod part (1A) can rotate relative to the groove (14) of the second rod part (1B) within a certain angle range. The rotatable angle range depends on the proportion of the at least part of the curved surface of the protruding structure which is not connected with the arc-shaped groove in the circumferential size of the curved surface.

[0048] By adopting the above technical scheme, since only the two ends of the protruding structure extend into the mounting sleeves, and only part of the curved surface is connected with the arc-shaped groove, the first rod part and the second rod part have a certain relative rotation range, that is, the included angle between the surface of the sound-absorbing panel mounted in the first mounting groove and the surface of the sound-absorbing panel mounted in the second mounting groove can be adjusted within a certain range (depending on the proportion of the at least part of the curved surface of the protruding structure in the circumferential size of the curved surface), so that the noise reduction device can form a noise blocking structure within a certain range, and the included angle between the two sound-absorbing panels can be set according to the shape of the actual construction site, thereby being more suitable for noise reduction in the actual construction site, and avoiding that the area surrounded by the noise reduction device is too large, thereby reducing the influence on the surrounding environment, for example, reducing the occupation of the surrounding area.

[0049] Further, when the first rod part (1A) and the second rod part (1B) are connected to each other, the first ray and the second ray form an angle θ in the range of [135°, 225°];

[0050] The first ray (LA) extends from the first position point (P1) to the position of the first mounting groove (11), and the first ray (LA) is parallel to the axis of the first mounting groove (11);

[0051] The second ray (LB) extends from the first position point (P1) to the position of the second mounting groove (12), and the second ray (LB) is parallel to the axis of the second mounting groove (12);

[0052] The first position point (P1) is the intersection point of the axis of the first mounting groove (11) and the axis of the second mounting groove (12) on the convex structure (13).

[0053] By adopting the above technical scheme, the angle between the surface of the sound-absorbing plate mounted in the first mounting groove and the surface of the sound-absorbing plate mounted in the second mounting groove is adjustable within a certain range (depending on the proportion of the at least part of the arc surface of the convex structure in the circumferential dimension), so that the noise reduction device can form a certain range of noise blocking structure, and the angle between the two sound-absorbing plates can be set according to the shape of the actual construction site, so that the noise reduction of the actual construction site area is more suitable.

[0054] Compared with the prior art, the beneficial effects of the noise reduction device for the construction site are: the construction site range is special, and there is often an engineering vehicle operation surface, the spliced mounting frame of the utility model can be equipped with a noise reduction device with different shapes and variable ranges, and the adaptability is stronger; through the application of the sound-absorbing plate, the propagation of noise pollution in the construction process is reduced, and the comfort of the construction operation is improved. The utility model can improve the construction site operation environment quality and effectively suppress the noise of the engineering equipment. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0056] Figure 1 It is the overall structure schematic view of the noise reduction device for the construction site of the utility model embodiment 1;

[0057] Figure 2 It is the top view of the first connecting piece of the L-shaped structure of the utility model embodiment 1;

[0058] Figure 3-1The top view of the first rod part in the noise reduction device of the embodiment 1 of the utility model;

[0059] Figure 3-2 The front view of the first rod part in the noise reduction device of the embodiment 1 of the utility model;

[0060] Figure 3-3 The top view of the second rod part in the noise reduction device of the embodiment 1 of the utility model;

[0061] Figure 3-4 The front view of the second rod part in the noise reduction device of the embodiment 1 of the utility model;

[0062] Figure 3-5 The partial sectional view of the first mounting slot of the first rod part in the noise reduction device of the embodiment 1 of the utility model along the length direction of the mounting rod, wherein the elastic material is wrapped outside the sound-absorbing plate and extends into the first mounting slot;

[0063] Figure 4-1 、 Figure 4-2 、 Figure 4-3 The schematic diagram of the included angle θ of the first ray and the second ray when the first rod part and the second rod part are connected in three different connection states, wherein the arrow on the first ray indicates the extension direction of the first ray, and the arrow on the second ray indicates the extension direction of the second ray;

[0064] Figure 5-1 The front view of the mounting frame forming two adjacent rectangles (polygons) in the noise reduction device of the embodiment 1 of the utility model;

[0065] Figure 5-2 The top view of the mounting frame forming two adjacent rectangles (polygons) in the noise reduction device of the embodiment 1 of the utility model.

[0066] Figure 5-3 The Figure 5-2 The enlarged structural schematic diagram of the first connecting piece 2 in the M part, wherein the part of the connected piece body of the mounting sleeve is shielded in the form of a dashed line;

[0067] Figure 6-1 The overall structural schematic diagram of the noise reduction device of the embodiment 2 of the utility model;

[0068] Figure 6-2 The Figure 6-1 The enlarged structural schematic diagram of the N part;

[0069] Figure 6-3 The Figure 6-2 The structural schematic diagram of the second connecting piece;

[0070] Figure 7-1The top view of the first rod part of the utility model embodiment 3 and the utility model embodiment 4;

[0071] Figure 7-2 The top view of the second rod part of the utility model embodiment 3;

[0072] Figure 8-1 The top view of the connecting structure of the first rod part of the utility model embodiment 3 and the second rod part when the first rod part is located at the middle position of the rotation range thereof;

[0073] Figure 8-2 The top view of the connecting structure of the first rod part of the utility model embodiment 3 and the second rod part when the first rod part is located at one limit position of the rotation range thereof;

[0074] Figure 9 The top view of the second rod part of the utility model embodiment 4.

[0075] In the above drawings:

[0076] Mounting rod 1;First rod part 1A;Second rod part 1B;First mounting groove 11;Second mounting groove 12;Protruding structure 13;Groove 14;Mounting piece base 15;Extension section 16;First protrusion 17A;Second protrusion 17B;First limiting groove 18A;Second limiting groove 18B;

[0077] First connecting piece 2;Mounting sleeve 21;Mounting protrusion 22;Connecting piece main body 23;

[0078] Connecting rod 3;

[0079] Silencing plate 4;Elastic material 41;

[0080] Base 5;

[0081] Second connecting piece 8;First limiting section 81;Second limiting section 82;Connecting section 83;

[0082] First ray LA;Second ray LB;First position point P1. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, obviously, the described embodiments are only part of the embodiments of the present application, not 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.

[0084] Embodiment 1

[0085] As Figure 1As shown, this embodiment 1 provides a noise reduction device for construction sites, including an installation frame for installation at the construction site. The installation frame is formed by splicing together at least three installation rods 1, and the installation frame forms at least two receiving areas. In this embodiment, the receiving areas can be polygonal. The angle between the plane of the polygon and the ground is within the range of 90°, that is, the sound-absorbing plate 4 is perpendicular to the ground. Those skilled in the art can also set the angle between the plane of the polygon and the ground to other angles within the angle range [45°, 90°] according to actual needs. A water supply pipe is installed on the installation frame, and a spray head is installed on at least one side of the water supply pipe, with the outlet of the spray head facing the construction site. The installation frame can be installed close to the noise-generating equipment at the construction site, or on at least one side of the construction site (i.e., the installation frame is installed on one side of the construction site to block noise from the construction site and the external environment on that side), or at least around the construction site, for example, close to machinery. When the first rod 1A rotates relative to the second rod 1B, the range of the angle between the opening direction of the first mounting groove 11 and the opening direction of the second mounting groove 12 is [θ1, θ2], where θ1 is the first angle value (preset value), θ2 is the second angle value (preset value), and θ2-θ1≥5°.

[0086] The noise reduction device may also include a base 5 installed at the construction site. A mounting frame is installed on the base 5.

[0087] The noise reduction device also includes a rigid sound-absorbing plate 4, which is limited by each mounting rod 1 and thus installed inside the mounting frame.

[0088] A polygon is a polygon with at least 3 sides, and can be a triangle, a rectangle, or a polygon with at least 5 sides.

[0089] The mounting frame is formed by splicing together at least four mounting rods 1; the mounting frame is also provided with at least N-3 connecting rods 3; each end of each connecting rod 3 is connected to the connection position of two adjacent mounting rods 1; the at least N-3 connecting rods 3 divide the inner space of the polygon into at least N-2 sub-parts, each sub-part being a triangle, where N is the number of sides of the polygon, and N≥4.

[0090] like Figure 1 As shown, in this embodiment, the polygon is a rectangle (quadrilateral), i.e., N=3. Therefore, only one connecting rod 3 is needed to divide the quadrilateral into two triangular structures. In this embodiment, the plane containing the polygon has an angle of 90° with the ground (that is, the surface of the sound-absorbing plate 4 has an angle of 90° with the ground).

[0091] The noise reduction device also includes a first connector 2 for connecting adjacent mounting rods 1. For example... Figure 2As shown, the first connecting piece 2 comprises a connecting piece body 23, and installation sleeves 21 arranged on the connecting piece body 23. The installation rods 1 extend into or outside the installation sleeves 21, so as to be connected with the first connecting piece 2. The number of the installation sleeves 21 is not less than the number of the installation rods 1 connected with the first connecting piece 2. In the embodiment, the number of the installation sleeves 21 is K. The K installation sleeves 21 are arranged outside the corresponding installation rods 1 respectively, so as to fix the installation rods 1. K is the number of the installation rods 1 connected with the first connecting piece 2, K≥2; the installation rods 1 extend into or outside the installation sleeves 21, so as to be connected with the first connecting piece 2.

[0092] The first connecting piece can have the following structure forms:

[0093] The first kind: at least one first connecting piece 2 has at least two installation sleeves 21, and the first connecting piece 2 forms an L-shaped structure as a whole, as shown in Figure 2 .

[0094] The second kind: at least one first connecting piece 2 has at least three installation sleeves 21, and the first connecting piece 2 forms a T-shaped structure or a Y-shaped structure as a whole.

[0095] The third kind: at least one first connecting piece 2 has at least four installation sleeves 21, and the first connecting piece 2 forms a cross-shaped structure as a whole.

[0096] The installation protrusions 22 and the connecting rods 3 can have the following structure forms:

[0097] The first kind (as shown in Figure 3-3 , Figure 3-4 ): the installation protrusions 22 are arranged on the second rod portions 1B, and recesses (not shown in the figure) corresponding to the installation protrusions 22 are arranged on the side walls of the installation sleeves 21, so as to limit the installation protrusions 22. The connecting rods 3 are arranged on the installation frames, and two through holes arranged near the two ends of the connecting rods 3 are matched with the two installation protrusions 22 respectively, so that the two installation rods 1 and the connecting rod 3 form a stable triangular structure.

[0098] The second kind (not shown in the figure): the installation protrusions 22 are arranged on the first connecting pieces 2, and the installation protrusions 22 can be arranged on the connecting piece bodies 23 as shown in Figure 2 . The connecting rods 3 are arranged on the installation frames, and two through holes are arranged near the two ends of the connecting rods 3. The installation protrusions 22 on the two opposite and non-adjacent first connecting pieces 2 in the installation frames are matched with the two through holes respectively, so that the two installation rods 1 and the connecting rod 3 form a stable triangular structure.

[0099] The water delivery pipe is provided with a mounting joint, the spray head comprises a connecting pipe and a spray head body connected with each other, and a spray hole is formed in the spray head body; the connecting pipe is connected with the mounting joint, so that the inner cavities of the corresponding water delivery pipe, the connecting pipe, the spray head body and the spray hole are sequentially communicated.

[0100] The spray head can have the following structure:

[0101] The first structure: the spray head body comprises a base and a rotating part arranged on the base, and the spray hole is arranged on the rotating part, for example, on the side surface of the rotating part and / or on the surface of the rotating part away from the base. The rotating axis of the rotating part is parallel to the axis of the connecting pipe. This structure is not shown in the figure.

[0102] The second structure: the spray head body comprises a base and a rotating part arranged on the base, and the rotating part has a ring structure. The rotating part is located on the side of the base away from the connecting pipe, and an end cover is arranged on the opening of the side of the rotating part away from the base. The spray hole comprises a first spray hole formed in the end cover and a second spray hole formed in the wall surface of the rotating part. The end cover is rotationally connected with the rotating part. The rotating axis of the end cover and the rotating axis of the rotating part are both parallel to the axis of the connecting pipe.

[0103] The mounting rod 1 is correspondingly provided with a water delivery pipe, and the water delivery pipes arranged on each mounting rod 1 are communicated with each other. At least one water delivery pipe is provided with the spray head. A pipe joint (for example, a pipe shunt joint or a pipe junction joint) is correspondingly arranged on each first connecting piece 2, and each port of the pipe joint is correspondingly connected with the water delivery pipe on the corresponding mounting rod 1. The pipe joint (not shown in the figure) can be fixed on the corresponding first connecting piece 2, for example, a three-way valve, a multi-way valve, etc.

[0104] The water delivery pipe can be a hard pipe or a hose. When a hard pipe is used, a pipe joint can be arranged on the first connecting piece at the position of the turning, i.e. the position of the connection of two mounting rods, so that the corresponding water delivery pipe of each mounting rod is connected with the corresponding interface of the pipe joint, thereby realizing the flow of water between different water delivery pipes.

[0105] At least one mounting groove for mounting the sound-absorbing plate 4 is formed in the mounting rod 1, and the mounting groove limits the sound-absorbing plate 4. The mounting groove extends in the length direction of the mounting rod 1. The sound-absorbing plate 4 is wrapped with rubber material and accommodated in the mounting groove. When each mounting rod 1 is spliced to form a mounting frame, the opening of at least one mounting groove of each mounting rod 1 is arranged towards the inside of the polygon, thereby facilitating the insertion of the sound-absorbing plate into the mounting groove and limiting the position of the sound-absorbing plate in the polygon. The opening of the mounting groove is arranged towards the direction perpendicular to the length direction of the mounting rod 1.

[0106] When the mounting frame of the embodiment 1 forms at least two polygons, among the at least two polygons, two adjacent polygons have a common side.

[0107] The mounting rod 1 used for forming the common side is provided with a first mounting groove 11 used for mounting the sound-absorbing plate 4 and a second mounting groove 12 used for mounting the sound-absorbing plate 4; the first mounting groove 11 and the second mounting groove 12 both extend in the length direction of the mounting rod 1; the opening direction of the first mounting groove 11 and the opening direction of the second mounting groove 12 are both perpendicular to the length direction of the mounting rod 1.

[0108] As shown in Figure 3-5 The sound-absorbing plate 4 is wrapped with the elastic material 41 outside and extends into the first mounting groove 11 of the first rod part 1A. The first mounting groove 11 can be a T-shaped groove, and the part of the sound-absorbing plate 4 extending into the first mounting groove can be a T-shaped structure, so that the limiting effect on the sound-absorbing plate 4 is better. The elastic material 41 is located between the sound-absorbing plate 4 and the inner wall of the first mounting groove, so as to play a buffering role and protect the sound-absorbing plate.

[0109] When the first mounting groove 11 and the second mounting groove 12 are both provided with the sound-absorbing plate 4, the sound-absorbing plate 4 mounted in the first mounting groove 11 is different from the sound-absorbing plate 4 mounted in the second mounting groove 12.

[0110] The sound-absorbing plate 4 mounted in the first mounting groove 11 is limited in one of the two adjacent polygons. The sound-absorbing plate 4 mounted in the second mounting groove 12 is limited in the other of the two adjacent polygons.

[0111] The mounting rod 1 can also correspond to the water supply pipe, for example, the water supply pipe can be mounted on the mounting rod 1 through the water pipe limiting piece 65 (which can be a pipe clamp or a pipe clamp). In addition to the mounting rod 1 located at the bottom of the mounting frame, the water supply pipe on the other mounting rod 1 can be provided with a spray head (not shown in the figure). The surface of the spray head can be a porous structure, each opening on the surface of the spray head forms an outlet of the spray head, and the axis direction of each opening is the outlet direction of the spray head. The spray head can adopt the structure of the prior art. The water supply pipes on each mounting rod 1 are communicated with each other and then flow back to the water storage device (not shown in the figure).

[0112] The purpose of the utility model is to provide a kind of construction site noise reduction device, can effectively improve construction site operation environment quality, at least one problem of limited noise reduction range, low artificial monitoring operation efficiency.

[0113] The embodiment 1 of the utility model is further described in detail as follows.

[0114] The utility model provides a noise reduction device for construction site, a noise reduction device for construction site, noise reduction device includes noise reduction device (that is, the soundproof material layer of soundproof board 4 structure constitutes), support device, device transverse arrangement is in the upper end of installation frame, noise reduction device installs inside installation frame, and output end is connected, noise reduction device can be provided spray device, including each shower head.

[0115] Support device includes base 5 (can be stable support), first connecting piece 2, installation rod 1, installation rod 1 can be spliced into rectangular installation frame through first connecting piece 2, at least one side of inside, outside of installation rod 1 is provided with installation groove, can limit soundproof board, installation rod 1 placed at the bottom can be connected with base 5, so that installation frame stands on the ground, can be provided with threaded port for installing water pipe limiting piece on installation rod 1, water pipe limiting piece is used to fix water pipe, first connecting piece 2 adopts installation sleeve to splice installation rod 1, can adopt L type, T type or cross type, the size of base 5 and installation rod 1 needs to be customized according to the construction site actual situation, the embodiment adopts frame assembly type, realizes that each device occupies smaller space, and installation is convenient, practical and efficient.

[0116] Noise reduction device includes soundproof board 4 (can adopt soundproof cotton), elastic material 41 (for example rubber material), according to the size of spliced rectangular frame, determine the size of soundproof board 4, rubber material 5 is wrapped around soundproof board 4, is embedded in the inside of rectangular frame (that is, the installation groove of each installation rod), constitutes noise reduction device, elastic material 41 can form annular structure that is suitable for the overall shape of soundproof board 4 as a whole, soundproof board 4 can adopt existing soundproof board, also can be formed by fiber processing sheet material, soundproof board 4 can block the scattering of dust at low altitude simultaneously, soundproof board 4 is placed in the inside recess (that is, installation groove) of installation rod 1, to prevent it from shaking, rubber material can be used to wrap the edge of soundproof board, and the soundproof board wrapped with rubber material is inserted into the installation groove in the inside of installation rod 1.

[0117] The device comprises a water delivery pipe, a water pipe limiting member (which can be a pipe clamp or a pipe clamp), a pipe joint, a spray head (which can be a atomizing spray head), a water pump control electromagnetic valve, a water pump, and a water storage tank. The water pump control electromagnetic valve, the water pump, and the water storage tank are not shown in the figure. The two electrical connection ends of the water pump control electromagnetic valve are respectively electrically connected with the water pump control end and the output end, and the control end of the water pump control electromagnetic valve is electrically connected. After the control end of the water pump control electromagnetic valve is electrified, the water pump is electrified and works, and water is delivered through the water delivery pipe. The water flows to different directions through the pipe joint, and under the action of water pressure, the spray head atomizes and sprays the water delivered by the water delivery pipe to the working surface. According to different dust concentrations and temperature and humidity, part or all of the spray heads can be opened. The direction of the water outlet of the spray head can be set as needed. The structure of the spray head and the angle adjusting structure of the spray head are prior art. The water delivery pipe can be made of PVC material, and the pipe joint can be made of a splice-free type, which can realize quick splicing and redirection, and has stronger high-efficiency applicability. Under the action of water pressure, the spray head can be arranged in different types of arrangement directions according to the actual situation of the construction site, such as horizontal arrangement or vertical arrangement; according to different dust concentrations and temperature and humidity, spray heads with different number and intensity can be opened, and the direction of the water outlet of the spray head can be adjusted to any angle, realizing efficient operation. In this embodiment, the spray head is arranged on the mounting rod, which can be arranged on the horizontal mounting rod or the vertical mounting rod. Compared with the prior art in which only the spray head is arranged at the top, the spray range and intensity are increased, and the effect is better.

[0118] The noise reduction device of the embodiment can be placed near the noise generating device at the construction site, such as a drill, a motor accessory, for example, an Atlas air compressor drill.

[0119] The mounting rod 1 for forming the common edge of the two polygons comprises a first rod part 1A and a second rod part 1B arranged correspondingly, the first rod part 1A has a protruding structure 13, and the second rod part 1B has a groove 14, as shown in Figure 3-1 、 Figure 3-2 、 Figure 3-3 、 Figure 3-4 .

[0120] The protruding structure 13 of the first rod part 1A and the groove 14 of the second rod part 1B cooperate with each other to form the mounting rod 1, and the first rod part 1A and the second rod part 1B extend in the length direction of the mounting rod 1.

[0121] The first rod part 1A comprises a mounting member base 15 and the protruding structure 13 arranged on the mounting member base 15. An extension section 16 can also be arranged between the protruding structure 13 and the mounting member base 15, as shown in Figure 3-5 . The protruding structure 13 and the extension section 16 form a protrusion on the mounting member base 15 as a whole.

[0122] When the first rod part 1A and the second rod part 1B are connected to each other, the mounting base 15 is located on the side of the protruding structure 13 away from the second rod part 1B.

[0123] The mounting base 15 and the protruding structure 13 are fixedly connected to each other or are an integral structure.

[0124] As shown in Figure 3-1 , Figure 3-3 The mounting base 15 and the protruding structure 13 are connected through the extension segment 16.

[0125] The mounting base 15, the extension segment 16 and the protruding structure 13 enclose the first limiting groove 18A and the second limiting groove 18B.

[0126] The first limiting groove 18A and the second limiting groove 18B are respectively located on the two sides of the extension segment 16, and the opening direction of the first limiting groove 18A is opposite to that of the second limiting groove 18B.

[0127] The groove 14 of the second rod part 1B is formed with the first protrusion 17A and the second protrusion 17B on the two sides thereof.

[0128] When the protruding structure 13 of the first rod part 1A and the groove 14 of the second rod part 1B are matched with each other, the first limiting groove 18A and the second limiting groove 18B are respectively used for limiting the first protrusion 17A and the second protrusion 17B.

[0129] The first rod part 1A and the second rod part 1B have a first connection state, a second connection state and a third connection state.

[0130] When the first rod part 1A and the second rod part 1B are in the first connection state, the first protrusion 17A extends into the first limiting groove 18A, the first protrusion 17A is in contact with the mounting base 15 (i.e., the mounting base 15 abuts against the first protrusion 17A) and / or the first protrusion 17A is in contact with the extension segment 16 (i.e., the extension segment 16 abuts against the first protrusion 17A), and there is a gap between the second protrusion 17B and the mounting base 15 and between the second protrusion 17B and the extension segment 16. As shown in Figure 4-1 , which is the third connection state of the first rod part 1A and the second rod part 1B.

[0131] When the first rod part 1A and the second rod part 1B are in the second connection state, the second protrusion 17B extends into the second limiting groove 18B, the second protrusion 17B is in contact with the mounting base 15 (i.e., the mounting base 15 abuts against the second protrusion 17B) and / or the second protrusion 17B is in contact with the extension segment 16 (i.e., the extension segment 16 abuts against the second protrusion 17B), and there is a gap between the first protrusion 17A and the mounting base 15 and between the first protrusion 17A and the extension segment 16. As shown inFigure 4-3 As shown, the first rod portion 1A and the second rod portion 1B are in the second connection state.

[0132] When the first rod portion 1A and the second rod portion 1B are in the third connection state, there is a gap between the first protrusion 17A and the mounting base 15, between the first protrusion 17A and the extension section 16, between the second protrusion 17B and the mounting base 15, and between the second protrusion 17B and the extension section 16. As shown, the first rod portion 1A and the second rod portion 1B are in the third connection state. Figure 4-2

[0133] In the length direction of the mounting rod 1, the size of the protrusion structure 13 is greater than the size of the mounting base 15 and the size of the second rod portion 1B, so that when the first rod portion 1A and the second rod portion 1B are connected to each other, the two ends of the protrusion structure 13 in the length direction of the mounting rod 1 respectively extend into the mounting sleeve 21 of the corresponding first connecting piece 2, thereby cooperating with the corresponding first connecting piece 2.

[0134] The outer wall of the protrusion structure 13 has an arc surface (preferably a circular arc surface); and the groove 14 is an arc-shaped groove in interference fit with the arc surface.

[0135] The first rod portion 1A is provided with the first mounting groove 11. The second rod portion 1B is also provided with the second mounting groove 12. The included angle θ1 between the opening direction of the first mounting groove 11 and the opening direction of the second mounting groove 12 ranges from 45° to 180°.

[0136] The size of the arc surface of the protrusion structure 13 in the circumferential direction is greater than the size of the arc-shaped groove in the circumferential direction, so that:

[0137] When the protrusion structure 13 is connected with the groove 14, at least part of the arc surface of the protrusion structure 13 is located outside the second rod portion 1B, and the mounting base 15 abuts against the second rod portion 1B or there is a gap between the mounting base 15 and the second rod portion 1B.

[0138] When the first rod portion 1A and the second rod portion 1B are connected to each other, the included angle θ of the first ray and the second ray ranges from 150° to 210°.

[0139] The first ray LA extends from the first position point P1 to the position where the first mounting groove 11 is located, and the first ray LA is parallel to the axis of the first mounting groove 11.

[0140] The second ray LB extends from the first position point P1 to the position where the second mounting groove 12 is located, and the second ray LB is parallel to the axis of the second mounting groove 12.

[0141] ​The first ray LA is the opening direction of the first mounting slot 11, and the second ray LB is the opening direction of the second mounting slot 12.

[0142] The first position point P1 is the intersection point of the axis of the first mounting slot 11 and the axis of the second mounting slot 12 on the protruding structure 13.

[0143] In the embodiment, the opening direction of the first mounting slot 11 and the direction of the protruding structure 13 can be opposite. The opening direction of the second mounting slot 12 and the opening direction of the groove 14 can be opposite.

[0144] When the first rod portion 1A and the second rod portion 1B are connected to each other, the included angle between the first ray and the second ray ranges from 90° to 210° in the length direction of the mounting rod 1.

[0145] Wherein:

[0146] The first ray LA extends from the first position point P1 to the position of the first mounting slot 11, and the first ray LA is parallel to the axis of the first mounting slot 11.

[0147] The second ray LB extends from the first position point P1 to the position of the second mounting slot 12, and the second ray LB is parallel to the axis of the second mounting slot 12.

[0148] The first position point P1 is the intersection point of the axis of the first mounting slot 11 and the axis of the second mounting slot 12 on the protruding structure 13.

[0149] Figure 4-1 、 Figure 4-2 、 Figure 4-3 When the first rod portion and the second rod portion of the embodiment 1 are connected in three different connection states, the included angle θ between the first ray and the second ray is 150°, 180° and 210° respectively. According to the specific shape of the area occupied by the noise generating machine in the actual construction site, different connection states of the first rod portion and the second rod portion can be set, so as to form an effective barrier to noise.

[0150] Due to the interference fit of the groove 14 and the arc surface, the first rod portion and the second rod portion can also be rotated to other connection positions, so that the included angle between the first ray and the second ray is other angles in the range of [150°, 210°].

[0151] When the mounting frame of the embodiment 1 forms a polygon, the mounting rod 1 forming the side of the polygon can adopt Figures 3-1 to 3-4The structure can be either composed of a first rod 1A and a second rod 1B joined together, or, instead of using two rods joined together, each mounting rod 1 can be a single, integral mounting rod 1 with at least one mounting slot. Specifically, when the mounting rods 1 are joined to form a polygonal structure, the openings of the mounting slots on each mounting rod 1 face inwards, allowing the sound-absorbing plate 4 to be inserted into each mounting slot and thus confined to the inner side of each mounting rod 1 (i.e., the location of the polygon).

[0152] When the mounting frame of this embodiment 1 forms at least two polygons, in addition to the mounting rod 1 used to form the common side, other mounting rods 1 may also be used. Figures 3-1 to 3-4 The structure consists of a first rod 1A and a second rod 1B joined together. Alternatively, other mounting rods 1 may not use two rods joined together, but rather a single, integrated mounting rod 1.

[0153] like Figure 5-1 , Figure 5-2 , Figure 5-3 The diagram shows the structure when the mounting frame forms two polygons (rectangles). Figure 5-2 As shown in the top view, the surfaces of both rectangles are perpendicular to the bottom surface, and the included angle between the two rectangular surfaces is an obtuse angle, thus allowing them to adapt to different occlusion shapes. For example... Figure 5-2 , Figure 5-3 As shown, for Figure 5-2 The mounting rod in section M (i.e., the mounting rod forming the common side of the two rectangles) has its first and second sections rotatable as follows: Figure 5-2 The connection positions are shown to accommodate the installation of two sound-absorbing panels 4. Figure 5-3 As shown, the connecting body 23 of the corresponding first connector 2 can have an opening (not shown in the figure), and one of the mounting sleeves 21 can be fitted inside the opening and have an interference fit with the connecting body 23. Figure 5-3 The dotted line represents the portion of the mounting sleeve 21 that extends into the opening, i.e., the portion obscured by the connecting body 23 in this view. This allows the axial direction of the mounting sleeve 21 to be adjusted within a certain angle range relative to the axial direction of the connecting body 23, thereby accommodating the corresponding mounting rod (i.e., Figure 5-2 The installation of the mounting rod on the left side. Or, for Figure 5-1 The rectangle on the left can also be installed without the top and bottom mounting rods. That is, the sound-absorbing plate 4 in the rectangle on the left can be installed by two mounting rods on the left and right sides that extend in the direction perpendicular to the ground.

[0154] In this embodiment 1, the mounting rod 1 is divided into a left rod and a right rod (i.e., the first rod section and the second rod section), which are spliced ​​together by a fan-shaped groove. The angle between the axes of the first rod section and the second rod section can be changed by large-angle rotation. The water supply pipe can be mounted on the mounting base 15 or on the second rod section 1B.

[0155] Embodiment 2

[0156] The difference between this embodiment 2 and embodiment 1 is that the first connecting piece is not provided, and the adjacent mounting rods 1 are connected in a hinged form. For example:

[0157] The first mode: the two adjacent mounting rods 1 are both provided with mounting protrusions 22, and the two mounting protrusions 22 are connected and limited by the second connecting piece 8, so as to realize the hinged connection of the two mounting rods 1. As shown in Figure 6-1 、 Figure 6-2 、 Figure 6-3 , the second connecting piece 8 has a first limiting section 81 and a second limiting section 82 for limiting the two adjacent mounting protrusions 22 respectively, and the first limiting section 81 and the second limiting section 82 are connected with each other by a connecting section 83. The second connecting piece 8 can be in an S-shaped structure, that is, the two openings (formed by the curved first limiting section 81 and the curved second limiting section 82 respectively) of the S-shaped structure are arranged oppositely and limit the mounting protrusions 22 of the two adjacent mounting rods 1 respectively. One of the mounting protrusions 22 is connected with the connecting rod 3. Alternatively, the first limiting section 81 and the second limiting section 82 can also be in a circular ring shape, and limit the mounting protrusions 22 of the two adjacent mounting rods 1 respectively, that is, the two circular ring shapes are connected by the connecting section 83, and the second connecting piece 8 as a whole forms an 8-shaped structure.

[0158] The second mode (not shown in the figure): one mounting rod 1 is stacked on another mounting rod, and the two mounting rods 1 form an L-shaped structure. The structures of the first rod portion 1A and the second rod portion 1B of the mounting rod 1 can refer to the structures of Figures 3-1 to 3-4 . The connecting rod 3 can be provided with two through holes near the two ends, and the two through holes are matched with the two mounting protrusions 22 respectively, so that the two mounting rods 1 and the connecting rod 3 form a stable triangular structure.

[0159] Embodiment 3

[0160] As shown in Figure 7-1 、 Figure 7-2 、 Figure 8-1 、 Figure 8-2 , the difference between this embodiment 3 and embodiment 1 is that, from the length direction of the second rod portion 1B, the included angle between the plane where the surface of the first protrusion 17A opposite to the groove 14 is located and the plane where the surface of the second protrusion 17B opposite to the groove 14 is located is 90°, so that the included angle θ between the first ray (i.e. the opening direction of the first mounting groove 11) and the second ray (i.e. the opening direction of the second mounting groove 12) is in the range of [135°, 225°], that is, compared with embodiment 1, the range of the rotation angle is increased.

[0161] As shown in Figure 8-1As shown, the first rod portion 1A and the second rod portion 1B are in the third connection state. Figure 8-2 As shown, the first rod portion 1A and the second rod portion 1B are in the second connection state.

[0162] Embodiment 4

[0163] With Figure 9 With Figure 7-1 The structure of the mounting rod 1 of the present embodiment 4 is shown in combination. The present embodiment 4 is different from the embodiment 3 in that the second mounting slot 12 is opened at a different position, so that the range of the angle θ between the first ray (i.e. the opening direction of the first mounting slot 11) and the second ray (i.e. the opening direction of the second mounting slot 12) is [45°, 135°].

[0164] The embodiments of the present application are described in detail above with reference to the drawings, but it is not limited to the description and the embodiments, and it can be fully applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and a number of improvements and refinements can be made without departing from the principles of the present application. These improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A noise reduction device for a construction site, comprising a mounting frame for being arranged at the construction site and a sound absorbing panel (4), characterized in that: The mounting frame is formed by splicing mounting rods (1); the mounting frame forms at least two accommodation areas for accommodating sound-absorbing panels (4) / sound-absorbing panel support structures; The mounting rod (1) between the two adjacent accommodation areas comprises a first rod portion (1A) and a second rod portion (1B) which are rotatably connected to each other; the first rod portion (1A) and the second rod portion (1B) are matched with each other, thereby forming the mounting rod (1); The first rod portion (1A) is provided with a first mounting groove (11) for mounting the sound-absorbing panel (4) / sound-absorbing panel support structure, and the second rod portion (1B) is provided with a second mounting groove (12) for mounting the sound-absorbing panel (4) / sound-absorbing panel support structure; When the first rod portion (1A) is rotated relative to the second rod portion (1B), the included angle between the opening direction of the first mounting groove (11) and the opening direction of the second mounting groove (12) changes in the range of [θ1, θ2], wherein θ1 is a first angle value, θ2 is a second angle value, and θ2-θ1≥5°.

2. The noise reducing device of claim 1, wherein: The first rod portion (1A), the second rod portion (1B), the first mounting groove (11), and the second mounting groove (12) all extend in the length direction of the mounting rod (1); the opening direction of the first mounting groove (11) and the opening direction of the second mounting groove (12) are both perpendicular to the length direction of the mounting rod (1); The sound-absorbing panel (4) / sound-absorbing panel support structure mounted on the first mounting groove (11) is limited in one of the two adjacent accommodation areas; The sound-absorbing panel (4) / sound-absorbing panel support structure mounted on the second mounting groove (12) is limited in the other of the two adjacent accommodation areas.

3. The noise reducing device of claim 1, wherein: 15°≤θ2-θ1≤90°.

4. The noise reducing device of claim 1, wherein: 45°≤θ1≤135°.

5. The noise reducing device of claim 1, wherein: The noise reduction device further comprises a first connecting piece (2) for connecting adjacent mounting rods (1), the first connecting piece (2) comprises a connecting piece main body (23) and a mounting sleeve (21) provided on the connecting piece main body (23), the number of mounting sleeves (21) is not less than the number of mounting rods (1) connected to the first connecting piece (2); the mounting rod (1) extends into the corresponding mounting sleeve (21) or is sleeved outside the mounting sleeve (21), thereby being connected with the first connecting piece (2); or The adjacent mounting rods (1) are connected in a hinged manner; or The noise reduction device further comprises a second connecting piece (8); the mounting rod (1) is provided with a mounting protrusion (22), and the second connecting piece (8) has a first limiting section (81) and a second limiting section (82) for limiting the adjacent two mounting protrusions (22), respectively; when the adjacent two mounting rods (1) are connected, the mounting protrusions (22) of the adjacent two mounting rods (1) are connected through the second connecting piece (8).

6. The noise reducing device of any one of claims 1-5, wherein: The first rod portion (1A) has a protruding structure (13), and the second rod portion (1B) has a groove (14) matched with the protruding structure (13); The first rod portion (1A) and the second rod portion (1B) are rotatably connected through the cooperation of the protruding structure (13) and the groove (14).

7. The noise reducing device of claim 6, wherein: The first rod part (1A) comprises a mounting base (15) connected with a convex structure (13) through an extension section (16); The mounting base (15), the extension section (16) and the convex structure (13) form a first limiting groove (18A) and a second limiting groove (18B); The first limiting groove (18A) and the second limiting groove (18B) are respectively located on two sides of the extension section (16); The groove (14) of the second rod part (1B) forms a first convex (17A) and a second convex (17B) on two sides thereof; The first rod part (1A) and the second rod part (1B) have a first connection state, a second connection state and a third connection state; When the first rod part (1A) and the second rod part (1B) are in the first connection state, the first convex (17A) extends into the first limiting groove (18A), the first convex (17A) is in contact with the mounting base (15) and / or the extension section (16), and gaps exist between the second convex (17B) and the mounting base (15) and between the second convex (17B) and the extension section (16); When the first rod part (1A) and the second rod part (1B) are in the second connection state, the second convex (17B) extends into the second limiting groove (18B), the second convex (17B) is in contact with the mounting base (15) and / or the extension section (16), and gaps exist between the first convex (17A) and the mounting base (15) and between the first convex (17A) and the extension section (16); When the first rod part (1A) and the second rod part (1B) are in the third connection state, gaps exist between the first convex (17A) and the mounting base (15), between the first convex (17A) and the extension section (16), between the second convex (17B) and the mounting base (15) and between the second convex (17B) and the extension section (16).

8. The noise reducing device of claim 7, wherein: The noise reduction device further comprises a first connector (2) for connecting adjacent mounting rods (1), the first connector (2) comprising a connector main body (23) and a mounting sleeve (21) arranged on the connector main body (23), the mounting rod (1) extending into or being sleeved outside the mounting sleeve (21) to be connected with the first connector (2); In the length direction of the mounting rod (1), the size of the convex structure (13) is greater than the size of the mounting base (15) and the size of the second rod part (1B), so that when the first rod part (1A) and the second rod part (1B) are connected with each other, the two ends of the convex structure (13) in the length direction of the mounting rod (1) extend into the mounting sleeves (21) of the corresponding first connectors (2) to cooperate with the corresponding first connectors (2).

9. The noise reducing device of claim 7, wherein: The outer wall of the convex structure (13) has a curved surface; the groove (14) is an arc-shaped groove in interference fit with the curved surface.

10. The noise reducing device of claim 9, wherein: The size of the curved surface of the convex structure (13) in the circumferential direction is greater than the size of the arc-shaped groove in the circumferential direction, so that: When the convex structure (13) is connected with the groove (14), at least part of the arc surface of the convex structure (13) is located outside the second rod part (1B), and the mounting base (15) abuts against the second rod part (1B) or has a gap with the second rod part (1B).

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