Spray material spray device

Abstract

To provide a spray device for a spray material, which is excellent in spray efficiency.SOLUTION: A spray device 1 for a spray device comprises: pressurized containers 3A, 3B to which the spray material is supplied; air ducts 2A, 2B for injecting pressurized air into the pressurized containers 3A, 3B; and first and second transportation paths 8A, 8B for transporting the spray material discharged from the pressurized containers 3A, 3B. The first and second transportation paths 8A, 8B are individually provided in the pressurized container 3B. The first and second transportation paths 8A, 8B individually have an airflow meter and airflow adjustment means. The spray device for the spray material is configured to compare a measured value of the airflow meter provided on the first transportation path 8A and a measured value of the airflow meter provided on the second transportation path 8B, and reduce a difference between both values by the airflow adjustment means when the difference between both values is equal to or greater than a predetermined value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spraying device for spraying a spray material. [Background technology]

[0002] Conventionally, there has been a spraying method of spraying materials such as mortar, concrete, and greening base materials, which is carried and sprayed by compressed air (see, for example, Patent Document 1). In this type of method, for example, as shown in Fig. 2, a spraying device 50 having an air passage 52 connected to a compressor 51 is used.

[0003] This spraying device 50 has an upper pressurized container 53 to which the spray material is supplied from a hopper 55 or the like via an upper slide valve 56, and a lower pressurized container 54 which is connected to the upper pressurized container 53 via a lower slide valve 57. In this spraying device 50, the upper pressurized container 53 is equipped with upper agitating means 53A such as a screw blade or T-blade, and the lower pressurized container 54 is equipped with lower agitating means 54A such as a screw blade or T-blade. In this regard, in this spraying device 50, the upper agitating means 53A and the lower agitating means 54A are configured to be driven in conjunction with each other by a drive source M such as a motor. The bottom of the lower pressurized container 54 is equipped with a discharge port 59 for the spray material. A conveying path 58 which is connected to the air path 52 is connected to this discharge port 59, and pressurized air is configured to flow through the air path 52. Incidentally, the air passage 52 is also connected to the upper pressurization vessel 53 and the lower pressurization vessel 54, and pressurized air is blown into the upper pressurization vessel 53 and the lower pressurization vessel 54. In this spraying device 50, the spray material is supplied from a hopper 55 into the upper pressurization vessel 53. The spray material supplied into the upper pressurization vessel 53 is agitated in the upper pressurization vessel 53 by agitation means 53A.

[0004] The spray material stirred in the upper pressurized container 53 is transferred into the lower pressurized container 54 when the lower slide valve 57 changes from a closed state to an open state, while the upper pressurized container 53 and the lower pressurized container 54 are at approximately the same pressure. The spray material stirred in the lower pressurized container 54 is further stirred in the lower pressurized container 54, and is discharged into the conveying path 58 from a discharge port 59 provided on the bottom surface of the lower pressurized container 54. The spray material discharged into the conveying path 58 is pressure-fed toward the object to be sprayed by the pressurized air flowing inside the conveying path 58, and is sprayed toward the object to be sprayed from a nozzle or the like provided at the tip of the conveying path 58.

[0005] Although there are no problems with the conventional spraying device 50 or the spraying method using this spraying device 50 in terms of spraying quality, there is a problem with poor spraying efficiency. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-056851 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a spraying device for a spray material that has excellent spraying efficiency. [Means for solving the problem]

[0008] In terms of improving spraying efficiency, the first thing that was considered was to have two or more conveying paths. However, during the spraying operation, the two nozzles move and the nozzle heights differ, resulting in a difference in the amount of air sent. Specifically, the air sent from the higher nozzle position becomes smaller. When this difference in air flow occurs, the air in the conveying path with a larger amount of air sent flows smoothly, but the air in the conveying path with a smaller amount of air sent flows poorly, which can cause blockages. Based on the above assumptions, the following means was developed to solve the above problem.

[0009] (Invention described in claim 1) a pressurized container into which the spray material is supplied; an air passage for blowing pressurized air into the pressurized container; First and second conveying paths for conveying the spray material discharged from the pressurized container; the first and second conveying paths are provided separately for the pressurized container, The first and second conveying paths are each provided with an air flow meter and an air flow adjusting means, The measurement value of the air flow meter provided on the first conveying path is compared with the measurement value of the air flow meter provided on the second conveying path, and if the difference between the two is equal to or greater than a predetermined value, the difference between the two is reduced by the air volume adjusting means. A spraying device for spraying a spray material.

[0010] (Invention described in claim 2) the inside of the pressurized container communicates with the inside of the first conveying path and the inside of the second conveying path via a discharge port provided on the bottom surface of the pressurized container; The discharge outlet of the first conveying path and the discharge outlet of the second conveying path are aligned in a direction perpendicular to the conveying direction of the spraying material, A spraying device for the spray material according to claim 1. [Effects of the Invention]

[0011] According to the present invention, a spraying device for spraying a spray material with excellent spraying efficiency is provided. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram of the spraying device and spraying method of the present embodiment. [Figure 2] FIG. 1 is an explanatory diagram of a conventional spraying device and spraying method. DETAILED DESCRIPTION OF THE INVENTION

[0013] Next, an embodiment of the present invention will be described. Note that this embodiment is an example of the present invention, and the scope of the present invention is not limited to the scope of this embodiment.

[0014] FIG. 1 shows a schematic diagram of a spraying device for spraying the spray material according to this embodiment.

[0015] In the method of this embodiment, spraying is performed using a spraying device 1 connected to a compressor or the like (not shown). This spraying device 1 has a pressurized container consisting of an upper pressurized container 3A and a lower pressurized container 3B located below the upper pressurized container 3A.

[0016] An upper opening / closing gate 4A is provided on the top of the upper pressurized vessel 3A, and spraying material is supplied into the upper pressurized vessel 3A from a hopper or the like through this upper opening / closing gate 4A. The upper pressurized vessel 3A and the lower pressurized vessel 3B are connected via the lower opening / closing gate 4B, and the spraying material can be moved from the upper pressurized vessel 3A into the lower pressurized vessel 3B.

[0017] The upper pressurized vessel 3A is provided with an upper stirring means 5A for stirring and, if necessary, mixing the spray material, and the lower pressurized vessel 3B is provided with a lower stirring means 5B for stirring and, if necessary, mixing the spray material. The upper stirring means 5A and the lower stirring means 5B are composed of, for example, screw blades, T-shaped blades, etc.

[0018] In this regard, the upper stirring means 5A and the lower stirring means 5B can be configured to operate in conjunction with each other, but in this embodiment, the upper stirring means 5A is driven by a driving source 6A such as a motor, while the lower stirring means 5B is driven by a driving source 6B such as a motor different from the driving source 6A.

[0019] Furthermore, in this embodiment, a mechanism is provided for estimating the physical properties of the spraying material, such as the table flow value and vane shear resistance, based on the torque of the agitation means 5A, 5B, particularly in this embodiment, based on the torque of the agitation means 5A in the upper pressurized vessel 3A. In this regard, the workability of the spraying material can be expressed by its physical property values. Therefore, the workability of the spraying material can be controlled by estimating and managing the physical property values ​​from the torque value of the agitation means 5A, 5B. However, since the agitation torque value also depends on the amount of spraying material remaining in the pressurized vessels 3A, 3B, it is preferable to measure it when the remaining amount of material is known (e.g., when the vessels are full of material). Factors that affect the physical properties that indicate workability include the W / C (water ratio), the particle size of the fine aggregate (sand), the amount of admixture (water-reducing agent), and the type of cement.

[0020] Incidentally, physical properties can be estimated, for example, by calculating a correlation equation between the stirring torque value and the physical property value in advance and substituting the stirring torque value measured during construction (when the device is operating) into this correlation equation.

[0021] Although either the torque value of the upper pressurizing vessel 3A or the torque value of the lower pressurizing vessel 3B can be used, it is preferable to use the torque value of the upper pressurizing vessel 3A rather than the torque value of the lower pressurizing vessel 3B, where the amount of material is constantly changing. Specifically, for example, it is preferable to charge the spray material and water into the upper pressurizing vessel, knead them, and then start measurement when the measured value of the stirring torque has settled to a constant value.

[0022] Meanwhile, pressurized air is blown into the upper pressurized vessel 3A via air passage 2A, and pressurized air is blown into the lower pressurized vessel 3B via air passage 2B. In this embodiment, air passage 2A and air passage 2B merge (combine) upstream and are connected to a compressor or the like. However, air passage 2A and air passage 2B may each be connected to a compressor or the like.

[0023] The air passage 2A is a flow path for blowing pressurized air into the upper pressurized vessel 3A, and the upper pressurized vessel 3A may need to be rapidly pressurized. Therefore, in this embodiment, the air passage 2A is provided with a rapid air passage 2C that is parallel to the air passage 2A.

[0024] The upper pressurized vessel 3A and the lower pressurized vessel 3B are each provided with an exhaust port 3C, 3D that can be opened and closed separately. The exhaust port 3D of the lower pressurized vessel 3B is configured to open when the transport paths 8A, 8B, which will be described later, are blocked. In particular, in this embodiment, the exhaust port 3C is opened when the pressure inside the lower pressurized vessel 3B is equal to or higher than a predetermined pressure, preferably equal to or higher than 0.89 MPa, and more preferably equal to or higher than 0.90 MPa, and the air volume of the transport paths 8A, 8B is equal to or lower than a predetermined volume, preferably equal to or lower than 0.8 m 3 / min or less, preferably 0.5m 3 This configuration is objective and suitable for automating the opening and closing of the exhaust port 3D.

[0025] The spraying device 1 of this embodiment further includes a first conveying path 8A and a second conveying path 8B for conveying the spray material discharged from the lower pressurized container 3B. The first and second conveying paths 8A and 8B are provided separately for the lower pressurized container 3B. More specifically, the conveying paths 8A and 8B are each connected to the lower pressurized container 3B via the spray material outlets 7A and 7B provided at the bottom (particularly the bottom surface) of the lower pressurized container 3B. In particular, in this embodiment, as shown enlarged in FIG. 1, the outlet 7A of the first conveying path 8A and the outlet 7B of the second conveying path 8B are aligned in a direction perpendicular to the conveying direction of the spray material. This embodiment makes it easy to equalize the airflow rates of the conveying paths 8A and 8B. Furthermore, the conveying paths 8A and 8B merge (unify) with the air paths 2A and 2B upstream, and are configured so that pressurized air from a compressor or the like flows through the conveying paths 8A and 8B. In this regard, the conveying paths 8A and 8B can also be connected to a compressor or the like separately from the air paths 2A and 2B without merging with the air paths 2A and 2B.

[0026] Each of the air passage 2B and the conveying passages 8A and 8B is provided with an air flow meter 11, a pressure meter 12, and an air volume adjusting means 13. Each of the air passages 2A, 2B, and 2C and the conveying passages 8A and 8B is provided with a manual valve 14 and an on-off valve 15. The measured value of the air flow meter 11 provided on the first conveying passage 8A is compared with the measured value of the air flow meter 11 provided on the second conveying passage 8B, and when the difference between the two is equal to or greater than a predetermined value, preferably 0.2 m 3 / min or more, preferably 0.1m 3 / min or more, the difference between the two is reduced by the air volume adjusting means 13.

[0027] Although the specific method for reducing the difference between the two is not particularly limited, it is preferable to adjust the air volume of each conveying pocket 8A, 8B to a desired value (set value), thereby reducing the difference between the two.

[0028] In the spraying apparatus 1 of this embodiment, first, spraying materials such as mortar, concrete, and greening materials are supplied from a hopper or the like into the upper pressurized vessel 3A. The spraying materials supplied into the upper pressurized vessel 3A are stirred and, if necessary, mixed by the stirring means 5A within the upper pressurized vessel 3A. The spraying materials stirred in the upper pressurized vessel 3A move into the lower pressurized vessel 3B when the lower opening / closing gate 4B switches from a closed state to an open state while the upper pressurized vessel 3A and the lower pressurized vessel 3B are at similar pressures (e.g., 0.40 to 0.65 MPa). The spraying materials transferred to the lower pressurized vessel 3B are further stirred and mixed within the lower pressurized vessel 3B and then discharged into the conveying paths 8A and 8B from the discharge ports 7A and 7B at the bottom of the lower pressurized vessel 3B. This discharge is facilitated by the pressure of the pressurized air blown into the lower pressurized vessel 3B through the air path 2B. The spray material discharged into the conveying paths 8A, 8B is pressurized toward the target by the pressurized air flowing through the conveying paths 8A, 8B, and is sprayed toward the target from a nozzle or the like (not shown) provided at the tip of the conveying paths 8A, 8B.

[0029] In this embodiment, the movement of the spray material is promoted by the pressurized air from air path 2B and the pressurized air flowing through conveying path 8 as described above, but in air path 2B and conveying path 8, air volume adjustment means 13 is automatically controlled based on the measurement value of air volume meter 11. Furthermore, when the measurement value of pressure meter 12 in at least one of air path 2B and conveying paths 8A, 8B, preferably both, exceeds a predetermined value, spraying of the spray material is automatically stopped. In this respect, the spraying device 1 of this embodiment does not require control by a skilled operator, etc., and is therefore very safe.

[0030] The predetermined value is a preset pressure that is expected when the transport path 8, the nozzle, or the like is blocked, and is, for example, 0.69 to 0.90 MPa.

[0031] More preferably, a first measurement value measured by pressure gauge 12 provided in air passage 2B is compared with a second measurement value measured by pressure gauge 12 provided in conveying passages 8A, 8B, and the first measurement value / second measurement value is controlled to be 1.00 to 1.25, preferably 1.00 to 1.20. This configuration ensures that the spray material is reliably discharged from lower pressurized vessel 3B to conveying passages 8A, 8B, eliminating the possibility of backflow and the like, and also eliminating the possibility of blockage of conveying passages 8A, 8B being overlooked.

[0032] When the pressurized container is composed of multiple pressurized containers 3A, 3B as in this embodiment, it is preferable to control the agitation means 5A, 5B in each pressurized container individually based on the measurement values ​​of the airflow meter 11 and the pressure meter 12 corresponding to each pressurized container. This embodiment ensures reliable agitation in each pressurized container. This consideration is difficult to achieve with conventional manual control, and is unique to the method of this embodiment. [Industrial Applicability]

[0033] It can be used as a spraying device for spraying materials such as mortar, concrete, and greening materials. [Explanation of symbols]

[0034] 1. Spraying equipment 2A, 2B, 2C air passages 3A, 3B Pressurized vessel 3C,3D exhaust port 4A, 4B Opening and closing gate 5A,5B Stirring means 6A, 6B drive source 7A,7B Outlet 8A, 8B conveying path 11 Air flow meter 12 Pressure gauge 13 Air volume adjustment means 14 Manual valve 15 On-off valve

Claims

1. a pressurized container into which the spray material is supplied; an air passage for blowing pressurized air into the pressurized container; a first conveying path and a second conveying path for conveying the spray material discharged from the pressurized container; the first and second conveying paths are provided separately for the pressurized container, The first and second conveying paths are each provided with an air flow meter and an air flow rate adjusting means, a measurement value of the air flow meter provided on the first conveying path and a measurement value of the air flow meter provided on the second conveying path are compared, and if the difference between the two is equal to or greater than a predetermined value, the difference between the two is reduced by the air volume adjusting means; A spraying device for spraying a spray material.

2. the inside of the pressurized container communicates with the inside of the first conveying path and the inside of the second conveying path via a discharge port provided on the bottom surface of the pressurized container; The discharge outlet of the first conveying path and the discharge outlet of the second conveying path are aligned in a direction perpendicular to the conveying direction of the spray material, A spraying device for spraying the spray material according to claim 1.

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