Low-resilience concrete spraying device

Abstract

The utility model discloses a low-resilience concrete spraying device which comprises a concrete spraying gun and a gas spraying assembly. The gas spraying assembly comprises a first annular body detachably connected with the spraying end of the concrete spraying gun, a second annular body arranged in the first annular body in the axial direction and connected with the free end of the first annular body, and a third annular body connected with the first annular body and annularly arranged outside the free end of the second annular body. A spraying opening of the concrete spraying gun, an inner cavity of the first annular body and an inner cavity of the second annular body are sequentially communicated in the axial direction to form a spraying channel, an air inlet used for being connected with an air source is formed in the first annular body in the axial direction, and an annular air inlet cavity which is formed in the axial direction and communicated with the air inlet is defined by the second annular body and the first annular body. The second annular body and the third annular body define an annular air outlet cavity which is arranged in the axial direction and communicates with the annular air inlet cavity, and the annular air outlet cavity is arranged in the air outlet direction in the radial direction in an inward inclined mode to form an annular conical fan cover.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete spraying, in particular to a low-rebound concrete spraying device. Background Art

[0002] At present, concrete spraying devices are widely used in the construction process to support and prevent seepage of foundation pit walls, or to reinforce and strengthen existing concrete structures. However, during the concrete spraying process, some concrete is prone to rebound due to failure to solidify in time. In addition, once the concrete mix ratio is unreasonable, the resistance of the spraying pipeline is large, the nozzle is worn, and the spraying distance is too far, the concrete rebound amount and the rebound rate will be further increased. Concrete spraying devices with high rebound rates not only cause a huge waste of raw materials and increase construction costs, but also make the dust content in the air at the construction site too high, threatening the health and safety of construction workers, but also prolonging the spraying time and delaying the construction progress.

[0003] Therefore, in order to reduce the concrete rebound rate of the concrete spraying device, Chinese utility model patent CN209510338U discloses a single-tube concrete spraying device for preventing rebound, in which a high-pressure air nozzle assembly is nested on the concrete spray gun to form a conical high-pressure air cover on the periphery of the sprayed concrete to prevent concrete rebound and reduce the concrete rebound rate.

[0004] However, in the above-mentioned concrete spraying device, the air duct in its high-pressure air nozzle assembly is a bundle of wind, which is not continuous in the circumferential direction, the blocking surface is not comprehensive, the concrete has a rebound gap, and the air outlet is arranged in a bell-shaped shape, and the bell-shaped mouth opens radially outward along the air outlet direction, which has a poor gathering effect on the concrete, a large amount of concrete rebound, and a poor effect of reducing the concrete rebound rate. At the same time, the high-pressure air nozzle assembly is mounted on the central part of the concrete spray gun, and the shape and structure of the central part of the concrete spray gun are varied, which has high requirements for assembly between components and poor versatility. Utility Model Content

[0005] The utility model provides a low-rebound concrete spraying device, which solves the technical problems of large rebound and poor versatility of the existing concrete spraying device.

[0006] According to one aspect of the utility model, a low-rebound concrete spraying device is provided, comprising a concrete spray gun and a gas spray assembly, the gas spray assembly comprising a first annular body detachably connected to the spray end of the concrete spray gun, a second annular body axially arranged in the first annular body and connected to the free end of the first annular body, and a third annular body connected to the first annular body and arranged outside the free end of the second annular body, the spray port of the concrete spray gun, the inner cavity of the first annular body and the inner cavity of the second annular body are sequentially connected along the axial direction to form a spray channel, an air inlet for connecting to a wind source is axially opened on the first annular body, the second annular body and the first annular body are enclosed to form an annular air inlet cavity arranged along the axial direction and connected to the air inlet, the second annular body and the third annular body are enclosed to form an annular air outlet cavity arranged along the axial direction and connected to the annular air inlet cavity, and the annular air outlet cavity is arranged radially inwardly along the air outlet direction to form an annular conical wind hood that gathers inward.

[0007] As a further improvement of the above technical solution:

[0008] Furthermore, the first annular body includes a first ring portion detachably mounted outside the injection end of the concrete spray gun, a first cone portion axially connected to the first ring portion and arranged radially outwardly inclined, and a second ring portion axially connected to the first cone portion and connected to the second annular body.

[0009] Furthermore, the ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun is 1.5-2.0.

[0010] Furthermore, the first annular body and the second annular body are detachably connected, and the first annular body and the third annular body are detachably connected.

[0011] Furthermore, the third annular body is provided with a counter-pushing member 1 for axial movement to push against the first annular body and thereby separate the third annular body from the first annular body.

[0012] Furthermore, a second counter-pushing member 2 is arranged on the second annular body for axial movement to push against the first annular body and thus separate the second annular body from the first annular body.

[0013] Furthermore, a plurality of air inlets are provided, and the plurality of air inlets are circumferentially spaced apart on the first annular body.

[0014] Furthermore, the low-rebound concrete spraying device also includes a connecting piece detachably connected to the spraying end of the concrete spray gun and the first annular body respectively, and the connecting piece includes a ferrule 1 detachably mounted on the outside of the spraying end of the concrete spray gun, a ferrule 2 detachably mounted on the outside of the first annular body, and connecting flanges respectively connected to the ferrule 1 and the ferrule 2.

[0015] Furthermore, the concrete spray gun is sequentially arranged along the axial direction with a connector for connecting to a concrete output source, a mixing body connected to the connector for mixing additives, and a nozzle connected to the mixing body for spraying concrete, and the inner cavity of the connector, the inner cavity of the mixing body and the inner cavity of the nozzle are sequentially connected along the axial direction.

[0016] Furthermore, the concrete spray gun also includes a fastener 1 detachably connected to the connecting body and the mixing body, and a fastener 2 detachably connected to the mixing body and the nozzle, respectively.

[0017] The utility model has the following beneficial effects:

[0018] The low-rebound concrete spraying device of the utility model has the following characteristics: when the concrete in the concrete spray gun flows through the spray port of the concrete spray gun, the inner cavity of the first annular body and the inner cavity of the second annular body to be sprayed onto the sprayed surface, the gas output by the wind source enters the annular air inlet cavity through the air inlet, and then flows through the annular air outlet cavity to form a continuous annular conical wind shield in the circumferential direction around the sprayed concrete. While blocking the concrete from spreading outward, the concrete can be contracted and gathered inward to be blown onto the sprayed surface, thereby greatly reducing the rebound of the concrete. The gas spraying assembly is detachably mounted on the spray end of the concrete spray gun through the first annular body, and the shape and structure of the spray end of the concrete spray gun are simple. The assembly requirements between the first annular body and the concrete spray gun are low, so that the gas spraying assembly can be added to concrete spray guns of different specifications and models, and the versatility is strong. Compared with the prior art, the scheme can realize low-rebound concrete spraying through the gas spraying assembly without complicated improvements to the concrete spray gun. The scheme has strong practicality and is suitable for wide promotion and application.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model;

[0023] Figure 3It is a cross-sectional schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model.

[0024] Legend:

[0025] 100, concrete spray gun; 110, connector; 120, mixing body; 130, nozzle; 140, fastener 1; 150, fastener 2; 200, gas injection assembly; 210, first annular body; 211, air inlet; 220, second annular body; 230, third annular body; 240, annular air inlet cavity; 250, annular air outlet cavity; 300, connector; 310, ferrule 1; 320, ferrule 2; 330, connecting flange. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0027] Figure 1 It is a structural schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model; Figure 2 It is a structural schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model; Figure 3 It is a cross-sectional schematic diagram of a low-rebound concrete spraying device according to a preferred embodiment of the utility model.

[0028] like Figure 1-Figure 3As shown, the low-rebound concrete spraying device of this embodiment includes a concrete spray gun 100 and a gas spray assembly 200, wherein the gas spray assembly 200 includes a first annular body 210 detachably connected to the spray end of the concrete spray gun 100, a second annular body 220 axially arranged in the first annular body 210 and connected to the free end of the first annular body, and a third annular body 230 connected to the first annular body 210 and annularly arranged outside the free end of the second annular body 220. The spray port of the concrete spray gun 100, the inner cavity of the first annular body 210 and the third annular body 230 are connected to the spray end of the concrete spray gun 100. The inner cavities of the two annular bodies 220 are connected in sequence along the axial direction to form an injection channel. The first annular body 210 is axially provided with an air inlet 211 for connecting to a wind source. The second annular body 220 and the first annular body 210 are combined to form an annular air inlet chamber 240 arranged along the axial direction and connected to the air inlet 211. The second annular body 220 and the third annular body 230 are combined to form an annular air outlet chamber 250 arranged along the axial direction and connected to the annular air inlet chamber 240. The annular air outlet chamber 250 is arranged radially inwardly along the air outlet direction to form an inwardly gathered annular conical wind hood. Specifically, when the concrete in the concrete spray gun 100 flows through the spray port of the concrete spray gun 100, the inner cavity of the first annular body 210 and the inner cavity of the second annular body 220 to be sprayed onto the sprayed surface, the gas output by the wind source enters the annular air inlet cavity 240 through the air inlet 211, and then flows through the annular air outlet cavity 250 to form a continuous annular conical wind shield in the circumferential direction around the sprayed concrete. While blocking the concrete from spreading outward, the concrete can be contracted and gathered inward to be blown onto the sprayed surface, thereby greatly reducing the concrete. The gas injection assembly 200 is detachably mounted on the injection end of the concrete spray gun 100 through the first annular body 210, and the injection end of the concrete spray gun 100 has a single shape and structure, and the assembly requirements between the first annular body 210 and the concrete spray gun 100 are low, so that the gas injection assembly 200 can be installed on concrete spray guns 100 of different specifications and models, and has strong versatility. Compared with the prior art, this solution can achieve low-rebound concrete injection through the gas injection assembly 200 without complicated improvements to the concrete spray gun 100, and has strong practicality and is suitable for wide promotion and application. Optionally, the gas injection assembly 200 is made of non-metallic materials such as polyurethane fiber, MC nylon, or lightweight metal materials.

[0029] like Figure 3As shown, in this embodiment, the first annular body 210 includes a first annular portion detachably sleeved on the outside of the spraying end of the concrete spray gun 100, a first conical portion axially connected to the first annular portion and arranged radially outwardly obliquely, and a second annular portion axially connected to the first conical portion and connected to the second annular body 220. Specifically, since the concrete sprayed from the spray gun mouth needs to flow through the inner cavity of the first annular body 210 and the inner cavity of the second annular body 220 before being sprayed onto the sprayed surface, in order to prevent the concrete from diffusing and adhering to the inner walls of the first annular body 210 and the second annular body 220 during the spraying process, the first conical portion is arranged radially outwardly obliquely to avoid the concrete, and the inner diameters of the second annular portion and the second annular body 220 are increased, thereby preventing the concrete from diffusing and adhering to the inner walls of the first annular body 210 and the second annular body 220 to the greatest extent.

[0030] In this embodiment, the ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun 100 is 1.5-2.0. Specifically, when the ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun 100 is between 1.5 and 2.0, the concrete can be prevented from diffusing and adhering to the inner walls of the first annular body 210 and the second annular body 220, and at the same time, the volume of the annular air inlet cavity is appropriate, thereby making the air intake of the wind source appropriate; when the ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun 100 is less than 1.5, the concrete is easy to diffuse and adhere to the inner walls of the first annular body 210 and the second annular body 220; when the ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun 100 is greater than 2.0, the volume of the annular air inlet cavity is too large, and the air intake of the wind source needs to be increased to ensure the cavity pressure, but the working power of the wind source is usually the same as the working power of the concrete spray gun 100. Therefore, when the air intake of the wind source is increased, the working power of the concrete spray gun 100 will be affected, resulting in the injection speed of the concrete spray gun 100 being too slow and the concrete rebound rate being increased.

[0031] like Figure 3 As shown, in this embodiment, the first annular body 210 and the second annular body 220 are detachably connected, and the first annular body 210 and the third annular body 230 are detachably connected. Specifically, the annular air outlet cavity is formed by the second annular body 220 and the third annular body 230, so by disassembling and replacing the second annular body 220 and the third annular body 230, an annular conical wind hood with different air outlet angles can be formed, thereby meeting the use requirements of the concrete spray gun 100 in different application environments, and having strong practicality.

[0032] In this embodiment, the third annular body 230 is provided with a counter-pushing member 1 for axial movement to push against the first annular body 210 and thereby separate the third annular body 230 from the first annular body 210. Specifically, the counter-pushing member 1 is axially moved to push against the first annular body 210, and then the third annular body 230 is removed from the first annular body 210, so as to facilitate the disassembly, assembly and replacement of the third annular body 230, so as to meet the use requirements of the concrete spray gun 100 in different application environments. Optionally, the counter-pushing member 1 is a counter-pushing bolt threadedly connected to the third annular body 230.

[0033] In this embodiment, the second annular body 220 is provided with a second anti-top piece for axial movement to push against the first annular body 210 and thus separate the second annular body 220 from the first annular body 210. Specifically, during the concrete spraying process, the concrete will inevitably spread and adhere to the inner wall of the second annular body 220, so the second anti-top piece 2 is axially moved to push against the first annular body 210, and then the second annular body 220 is removed from the first annular body 210, so as to facilitate the cleaning of the second annular body 220, thereby avoiding the accumulation of concrete and blocking the injection channel, and also facilitating the disassembly, assembly and replacement of the third annular body 230, so as to meet the use requirements of the concrete spray gun 100 in different application environments. Optionally, the second anti-top piece is an anti-top bolt threadedly connected to the second annular body 220.

[0034] like Figure 1 As shown, in this embodiment, a plurality of air inlets 211 are provided, and the plurality of air inlets 211 are arranged at intervals along the circumferential direction on the first annular body 210. Specifically, the air intake volume is increased by the plurality of air inlets 211, and the plurality of air inlets 211 are arranged at intervals along the circumferential direction on the first annular body 210, so as to ensure uniform air intake and the blocking and gathering effect of the annular conical wind shield.

[0035] like Figure 3 As shown, in this embodiment, the low-rebound concrete spraying device further includes a connecting member 300 detachably connected to the spraying end of the concrete spray gun 100 and the first annular body 210, respectively. The connecting member 300 includes a ferrule 1 310 detachably sleeved on the outside of the spraying end of the concrete spray gun 100, a ferrule 2 320 detachably sleeved on the outside of the first annular body 210, and a connecting flange 330 respectively connected to the ferrule 1 310 and the ferrule 2 320. Specifically, the spraying end of the concrete spray gun 100 and the first annular body 210 are detachably connected by the cooperation of the ferrule 1 310, the ferrule 2 320 and the connecting flange 330.

[0036] like Figure 3As shown, in this embodiment, the concrete spray gun 100 is sequentially provided with a connector 110 for connecting to a concrete output source, a mixing body 120 connected to the connector 110 for mixing additives, and a nozzle 130 connected to the mixing body 120 for spraying concrete along the axial direction, and the inner cavity of the connector 110, the inner cavity of the mixing body 120, and the inner cavity of the nozzle 130 are sequentially connected along the axial direction. Specifically, the concrete flows through the inner cavity of the connector 110, the inner cavity of the mixing body 120, and the inner cavity of the nozzle 130, and is sprayed into the spray channel through the spray gun port.

[0037] like Figure 3 As shown, in this embodiment, the concrete spray gun 100 further includes a fastener 140 detachably connected to the connecting body 110 and the mixing body 120, and a fastener 2 150 detachably connected to the mixing body 120 and the nozzle 130. Specifically, the connecting body 110 and the mixing body 120 are quickly connected together by the fastener 140, and the mixing body 120 and the nozzle 130 are quickly connected together by the fastener 2 150 to form the concrete spray gun 100. Optionally, the fastener 140 is a flange. Optionally, the fastener 2 150 is a flange.

[0038] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A low-rebound concrete spraying device, characterized in that: The invention comprises a concrete spray gun (100) and a gas spray assembly (200), wherein the gas spray assembly (200) comprises a first annular body (210) detachably connected to the spray end of the concrete spray gun (100), a second annular body (220) axially arranged inside the first annular body (210) and connected to the free end of the first annular body, and a third annular body (230) connected to the first annular body (210) and arranged outside the free end of the second annular body (220), wherein the spray port of the concrete spray gun (100), the inner cavity of the first annular body (210) and the inner cavity of the second annular body (220) are connected to each other. The inner cavities are sequentially connected along the axial direction to form an injection channel; an air inlet (211) for connecting to an air source is opened along the axial direction on the first annular body (210); the second annular body (220) and the first annular body (210) are enclosed to form an annular air inlet chamber (240) arranged along the axial direction and connected to the air inlet (211); the second annular body (220) and the third annular body (230) are enclosed to form an annular air outlet chamber (250) arranged along the axial direction and connected to the annular air inlet chamber (240); the annular air outlet chamber (250) is arranged radially inwardly along the air outlet direction to form an annular conical wind shield that gathers inwardly.

2. The low-rebound concrete spraying device according to claim 1, characterized in that: The first annular body (210) comprises a first annular portion detachably sleeved on the outside of the spraying end of the concrete spray gun (100), a first conical portion axially connected to the first annular portion and arranged radially outwardly inclined, and a second annular portion axially connected to the first conical portion and connected to the second annular body (220).

3. The low-rebound concrete spraying device according to claim 2, characterized in that: The ratio of the inner diameter of the second ring portion to the inner diameter of the injection port of the concrete spray gun (100) is 1.5-2.

0.

4. The low-rebound concrete spraying device according to claim 1, characterized in that: The first annular body (210) and the second annular body (220) are detachably connected, and the first annular body (210) and the third annular body (230) are detachably connected.

5. The low-rebound concrete spraying device according to claim 4, characterized in that: The third annular body (230) is provided with a counter-pushing member 1 for axial movement to push against the first annular body (210) and thereby separate the third annular body (230) and the first annular body (210).

6. The low-rebound concrete spraying device according to claim 5, characterized in that: The second annular body (220) is provided with a counter-pushing member 2 for axial movement to push against the first annular body (210) and thereby separate the second annular body (220) and the first annular body (210).

7. The low-rebound concrete spraying device according to any one of claims 1 to 6, characterized in that: A plurality of air inlets (211) are provided, and the plurality of air inlets (211) are arranged at intervals along the circumferential direction on the first annular body (210).

8. The low-rebound concrete spraying device according to any one of claims 1 to 6, characterized in that: The low-rebound concrete spraying device also includes a connecting piece (300) detachably connected to the spraying end of the concrete spray gun (100) and the first annular body (210), and the connecting piece (300) includes a first ferrule (310) detachably sleeved outside the spraying end of the concrete spray gun (100), a second ferrule (320) detachably sleeved outside the first annular body (210), and a connecting flange (330) respectively connected to the first ferrule (310) and the second ferrule (320).

9. The low-rebound concrete spraying device according to any one of claims 1 to 6, characterized in that: The concrete spray gun (100) is provided with a connecting body (110) for connecting to a concrete output source, a mixing body (120) connected to the connecting body (110) for mixing additives, and a nozzle (130) connected to the mixing body (120) for spraying concrete in sequence along the axial direction; the inner cavity of the connecting body (110), the inner cavity of the mixing body (120), and the inner cavity of the nozzle (130) are sequentially connected along the axial direction.

10. The low-rebound concrete spraying device according to any one of claims 1 to 6, characterized in that: The concrete spray gun (100) further comprises a first fastener (140) detachably connected to the connecting body (110) and the mixing body (120), and a second fastener (150) detachably connected to the mixing body (120) and the nozzle (130).

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