Blasting apparatus and blasting method

Abstract

This will allow workers to remotely control the amount of blasting material supplied according to the situation. [Solution] The blasting apparatus 100 includes an injection device 24 that injects blasting material 25 onto a surface to be treated 27, a transport hose 21 that transports the blasting material 25 to the injection device 24, a blasting material supply device 1 that supplies the blasting material 25 to the injection device 24 via the transport hose 21, control units 11 and 12 that control the amount of blasting material 25 supplied by the blasting material supply device 1, an operating device 15 that performs adjustment operations for the amount of blasting material 25 supplied, and transmission means 13, 20, A that remotely transmit the adjustment operations in the operating device 15 to the control units 11 and 12. The control units 11 and 12 control the amount of blasting material 25 supplied by the blasting material supply device 1 in accordance with the adjustment operations transmitted by the transmission means.

Description

Technical Field

[0001] The present invention relates to a blasting device and a blasting method.

Background Art

[0002] As blasting processes, various processes such as sandblasting, shot blasting, wet blasting, dry ice blasting, etc. are known depending on the type of blasting material (injected particles such as cleaning materials and abrasive materials) and the injection method. For example, in inspection and repair work on a painted steel structure, etc., a process for peeling off the paint is required. In the paint peeling process, an air blasting process is widely used in which a cleaning material is sprayed using compressed air and made to collide with the surface to be treated such as a steel structure for cleaning.

[0003] Patent Document 1 discloses a blasting cleaning abrasive material supply device capable of adjusting the supply amount of an abrasive material mixed with compressed air from within a pressurized storage section according to the scale adhering to the surface to be treated or the state of the thickness of the paint material.

[0004] Also, Patent Document 2 discloses a technique for detecting the amount of dust in a room where a blasting device is used by a particle sensor and controlling the supply amount of a blasting medium by the blasting device based on the detected amount of dust.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in conventional blasting equipment, when the blasting material supply device is installed far away from the surface to be treated (i.e., excluding equipment that performs blasting in a closed space such as an enclosure), the worker facing the surface to be treated could not remotely control the amount of blasting material supplied according to the situation.

[0007] Therefore, the object of the present invention is to provide a technology that allows workers to remotely control the amount of blasting material supplied according to the situation. [Means for solving the problem]

[0008] The means to solve the above problems are as follows:

[0009] (First aspect) An injection device that injects blast material onto a surface to be treated, The injection device includes a transport hose for transporting the blast material, A blast material supply device that supplies the blast material to the injection device via the transport hose, A control unit for controlling the amount of blast material supplied in the blast material supply device, An operating device for adjusting the supply amount of the blasting material, The device comprises a transmission means for remotely transmitting the adjustment operation of the operating device to the control unit, The control unit controls the amount of blast material supplied to the blast material supply device in accordance with the adjustment operation transmitted by the transmission means. A blasting device characterized by the following features.

[0010] (Effects and Benefits) For example, when the object to be blasted is a steel plate, rust and mill scale may be attached, and these are not uniform; some areas have more deposits than others. In areas with a lot of deposits, a higher supply of blasting material per unit time is more efficient, while in areas with little deposits, a lower supply of blasting material per unit time is sufficient, and if the blasting material is to be reused, damage to the blasting material can also be minimized. In other words, it is preferable to control the supply amount of blasting material according to the situation.

[0011] Furthermore, since blast material supply devices are generally not very portable, they are often installed far away from the surface to be treated, and the distance between the surface and the blast material supply device can reach several hundred meters. Therefore, it is not practical for workers performing blast treatment or other tasks facing the surface to go to the location of the blast material supply device and adjust the amount of blast material supplied.

[0012] This blasting device was developed in consideration of the above circumstances. With this blasting device, an operator facing the surface to be treated can remotely control the amount of blasting material supplied by operating a control device according to the situation. For example, an operator can observe the condition of the surface to be treated while performing paint stripping or dirt removal by blasting, or before and after blasting, and remotely adjust the amount of blasting material supplied according to the observation results, thereby controlling the amount of blasting material injected per unit time. Furthermore, if the amount of blasting material supplied by the control device can be adjusted to zero, the spraying of blasting material can be stopped remotely immediately after the work is completed. Thus, it becomes possible to spray blasting material appropriately. Note that the supply rate of blasting material refers to the amount of blasting material supplied per unit time.

[0013] (Second aspect) The transmission means includes an air hose that runs from the work area where the surface to be processed is located to the installation location of the blast material supply device, a compressed air supply source that supplies compressed air into the air hose, and a pressure sensor provided on the base end portion of the air hose located at the installation location of the blast material supply device, which detects the internal pressure of the air hose and transmits it to the control unit. The operating device includes pressure regulating means for adjusting the pressure in the air hose, The pressure sensor detects the pressure change in the air hose caused by the pressure adjustment operation of the pressure adjustment means and transmits it to the control unit, and the control unit controls the amount of blast material supplied according to the pressure in the air hose received from the pressure sensor. A blasting apparatus according to the first embodiment.

[0014] (Effects and Benefits) The operating device and the means for transmitting its operation are not particularly limited, and the operating device can be a mechanical switch or a wireless terminal such as a smartphone, and the means for transmission can be a wireless or wired electrical transmission means, etc., as appropriate. However, in workplaces where blasting is performed, volatile organic solvents may be used, and in such environments, the use of electrical equipment that could be a source of ignition is undesirable. In contrast, in the blasting apparatus of this embodiment, the adjustment operation of the amount of blasting material supplied is transmitted by the air pressure in the air hose, so it can be used even in environments where there is a possibility of ignition or explosion.

[0015] (Third aspect) The pressure regulating means includes a relief pressure reducing valve provided on the tip portion of the air hose located at the work area, and means for creating a closed space inside the air hose. The compressed air supply source supplies compressed air into the air hose via the relief-equipped pressure reducing valve. A blasting apparatus according to the second embodiment.

[0016] (Effects and Benefits) In the pressure regulating means of this aspect, when a pressure reducing valve with a relief function is set to a desired pressure and compressed air is supplied from a compressed air supply source into the air hose, the pressure reducing valve with a relief function closes when the pressure in the air hose rises and reaches the set pressure of the pressure reducing valve with a relief function. Also, even when the set pressure is operated thereafter, the pressure in the air hose changes and when it reaches the set pressure, the pressure reducing valve with a relief function closes, either by replenishing compressed air into the air hose or by discharging the air in the air hose by the relief function. Therefore, the pressure in the air hose can be changed to the set pressure without flowing compressed air through the air hose, and the response of the pressure change to the operation, and thus the response of the adjustment operation of the blast material supply amount, becomes faster, and the operability becomes good.

[0017] (Fourth aspect) The blast material is configured to be pressure-fed while riding on the compressed air supplied to the injection device via the blast material supply device and the transfer hose. The blast material supply device includes a first tank that stores the blast material at the upper stage, a second tank that communicates with the first tank and is in the middle stage, and a third tank that communicates with the second tank and is in the lower stage. A first on-off valve is provided at the communication part between the first tank and the second tank, and a second on-off valve is provided at the communication part between the second tank and the third tank. The first on-off valve and the second on-off valve open and close so as not to be in the open state at the same time, whereby the blast material in the first tank is sequentially supplied into the second tank and the third tank. It is provided with a metering supply device that supplies the blast material in the third tank to the transfer hose in a fixed quantity. The blast device according to the first aspect or the second aspect.

[0018] (Function and effect) In this embodiment, the blast material supply device has three tanks: an upper first tank for storing blast material, a middle second tank, and a lower third tank. The first and second tanks, and the second and third tanks are connected, and a first and second on-off valve are provided at the connecting sections. The blast material is supplied to the first tank, and is sequentially transferred to the second and third tanks by the alternating opening of the first and second on-off valves. Furthermore, a quantitative supply device is provided to supply the blast material in the third tank to a transport hose.

[0019] Here, by providing three tanks—a first tank, a second tank, and a third tank—and alternately opening and closing the first and second on-off valves located in the connecting section, it becomes possible to continuously supply the blasting material while maintaining the pressure of the compressed air that pumps the blasting material. Therefore, with this blasting device, it is possible to continuously replenish the blasting material to the first tank and eject the blasting material while maintaining the pressure of the compressed air that pumps the blasting material.

[0020] (Fifth aspect) An injection device that injects blast material onto a surface to be treated, The injection device includes a transport hose for transporting the blast material, A blast material supply device that supplies the blast material to the injection device via the transport hose, A control unit for controlling the amount of blast material supplied in the blast material supply device, An operating device for adjusting the supply amount of the blasting material, A blast treatment method using a blast treatment apparatus, comprising a transmission means for remotely transmitting the adjustment operation of the operating device to the control unit, In a work area where a surface to be processed exists, an operator performs the adjustment operation using the operating device, and the control unit controls the amount of blast material supplied to the blast material supply device in accordance with the adjustment operation transmitted by the transmission means. A blast treatment method characterized by the following features.

[0021] (Effects and Benefits) It produces the same effects as the first embodiment. [Effects of the Invention]

[0022] According to the present invention, workers can remotely control the amount of blasting material supplied according to the situation. [Brief explanation of the drawing]

[0023] [Figure 1] This is a schematic diagram of the entire blasting system. [Figure 2] This is a schematic diagram representing the main body of the blasting device. [Figure 3] This is a schematic diagram showing the open and closed states of the valve body in the blasting device. [Figure 4] This is a schematic diagram of an entire blasting system of a different configuration. [Modes for carrying out the invention]

[0024] The blasting apparatus and its use will be described below with reference to the drawings. However, the following description and drawings are merely examples of the present invention, and the content of the present invention should not be interpreted as being limited to these embodiments. Therefore, various modifications can be made in the following examples without departing from the spirit of the present invention.

[0025] The blasting device is not limited by the type of blasting material, the transport method, or the injection method, and any known method can be used as appropriate. For example, the blasting device may inject dry, particulate blasting material, or it may inject a slurry in which particulate blasting material is mixed with water or the like. Furthermore, the blasting device may either transport the blasting material by compressed air or transport a slurry containing the blasting material. In addition, the blasting device may project the blasting material by a rotating impeller or by spraying it with compressed air.

[0026] As blasting material, any known material such as alumina, glass beads, steel grit, steel cut wire, steel beads, stainless steel beads, and silica sand can be used without particular limitation. Stainless steel blasting material is preferred from the viewpoint of being less prone to rusting, easy to reuse, and having good long-term storage properties.

[0027] (Example of a blasting device) Figure 1 shows an example of an air blast type blasting apparatus 100. Specifically, the blasting apparatus 100 in this example comprises an injection device (blast gun in the illustrated example) 24 that injects blasting material 25 onto a surface 27 of an object to be treated 26 such as a structure, a transport hose 21 that transports the blasting material 25 to the injection device 24, and a blasting material supply device 1 that supplies the blasting material 25 to the injection device 24 via the transport hose 21. The blasting material supply device 1 includes control units 11 and 12 that control the amount of blasting material 25 supplied.

[0028] (Blast material supply device) The blasting material supply device 1 is not particularly limited as long as it is capable of supplying a fixed amount of blasting material and the supply amount is variable by the control units 11 and 12, and any known device can be used. For example, the blasting material supply device 1 shown in Figure 2 can be used. This blasting material supply device 1 includes a hopper-type first tank 31 into which blasting material is fed and stored, a hopper-type second tank 32 communicating with the lower end discharge port of the first tank and into which the blasting material from the first tank is supplied by dropping, a third tank 33 communicating with the lower end discharge port of the second tank 32 and into which the blasting material from the second tank is supplied by dropping, a first on-off valve 34 provided at the communication point between the first tank 31 and the second tank 32, a second on-off valve 35 provided at the communication point between the second tank 32 and the third tank 33, and a quantitative supply device 18 that supplies a fixed amount of blasting material 25 from the third tank 33 to the mixing pipe 16.

[0029] In the illustrated example, the first on-off valve 34 is composed of a lower end outlet of the first tank 31 and a valve body 34v that serves as its valve seat, and the second on-off valve 35 is composed of a lower end outlet of the second tank 32 and a valve body 35v that serves as its valve seat. However, a known valve device having a valve body and a valve seat, such as a butterfly valve, may be interposed between the first tank 31 and the second tank 32.

[0030] The mixing pipe 16 in the illustrated example is a T-shaped pipe having a straight main channel 16M, one end of which is connected to a compressed air A supply source and the other end of which is connected to a transport hose 21, and a sub-channel 16N that joins and communicates with the main channel 16M midway through the pipe, and blast material 25 is supplied in a fixed quantity from the quantitative supply device 18 via the sub-channel 16N. The blast material 25 supplied in a fixed quantity from the quantitative supply device 18 joins the compressed air A flowing through the main channel 16M via the sub-channel 16N and is carried by the compressed air A to the transport hose 21. A mixing device other than the mixing pipe 16 may be used as long as it can pressurize the blast material 25 supplied in a fixed quantity from the quantitative supply device 18.

[0031] The quantitative feeding device 18 can be a table feeder as shown in the illustration, or any other known device such as a screw feeder, step feeder, or rotary feeder, as appropriate.

[0032] The first tank 31 receives and stores blasting material 25 from the outside. When the first on-off valve 34 opens, the blasting material 25 in the first tank 31 is supplied to the second tank 32 by gravity. The blasting material 25 supplied to the second tank 32 is then transferred to the third tank 33 by gravity when the second on-off valve 35 opens. Here, the third tank 33 is in communication with the mixing pipe 16, and compressed air is supplied to the mixing pipe 16, so it is necessary to maintain the pressure. For example, if the first tank 31 is open to the atmosphere and at atmospheric pressure, if the first on-off valve 34 and the second on-off valve 35 are open at the same time, the air pressure in the mixing pipe 16 will drop, which may hinder the transport of the blasting material 25. Therefore, the open / closed states of the first on-off valve 34 and the second on-off valve 35 are controlled so that when one of the first on-off valve 34 or the second on-off valve 35 is closed, the other is open.

[0033] Specifically, the opening and closing of the first on-off valve 34 and the second on-off valve 35 are operated as follows. As shown in Figure 3, the blasting material 25 stored in the first tank 31 is transferred to the second tank 32 when the first on-off valve 34 is opened. At this time, the second on-off valve 35 is closed, and the third tank 33 is pressurized by the air pressure from the mixing pipe 16. Therefore, the transport pressure in the mixing pipe 16 is not lost. Next, as shown in Figure 2, the first on-off valve 34 is closed. Then the second on-off valve 35 is opened, and the blasting material 25 stored in the second tank 32 is transferred to the third tank 33. At this time, since the second on-off valve 35 is open, the second tank 32 and the third tank 33 are pressurized. Therefore, even in this state, the transport pressure in the mixing pipe 16 is not lost. Next, after the second on-off valve 35 is closed, the first on-off valve 34 is opened, and as shown in Figure 3, the blasting material 25 stored in the first tank 31 is transferred to the second tank 32.

[0034] From this point onward, the first on-off valve 34 and the second on-off valve 35 repeat this operation, maintaining high pressure inside the mixing pipe 16 and the transport hose 21, while the blasting material 25 is supplied to the third tank 33 in a batch manner, and the blasting material 25 in the third tank 33 is continuously supplied to the mixing pipe 16 by the quantitative supply device 18.

[0035] The control units 11 and 12 are not particularly limited in their control targets, as long as they can control the amount of blast material 25 supplied by the blast material supply device 1 (per unit time). In cases where the amount of blast material 25 supplied can be changed by controlling the drive source of the quantitative supply device 18, as in the illustrated example of the blast material supply device 1, the control units 11 and 12 can be configured using control equipment that controls the drive source. More specifically, in cases where an electric motor 10 such as a geared motor is used as the drive source, as in the illustrated example of a table feeder, and the supply amount is changed by controlling the rotational speed of the electric motor 10 with an inverter 11, the control units 11 and 12 can be configured with an inverter 11 and a controller 12 that transmits control signals such as speed signals to the inverter 11.

[0036] The blasting material 25, which is supplied in a fixed quantity from the quantitative supply device 18 to the mixing pipe 16, joins with compressed air in the mixing pipe 16, travels through the transport hose 21 on the compressed air, is transported to the injection device 24, and is continuously sprayed from the injection device 24 toward the surface to be treated 27. Here, for example, by changing the amount of blasting material 25 supplied by the quantitative supply device 18 without changing the flow velocity of the air that pumps the blasting material 25, the efficiency of the blasting process can be adjusted without changing the kinetic energy of each individual blasting material 25 (the effect that each individual blasting material 25 has on the surface to be treated 27).

[0037] The location where the blasting material supply device 1 is installed and the work area where the surface to be treated 27 is located (the location where the blasting material 25 is sprayed) may be tens to hundreds of meters apart. Furthermore, it is preferable to control the amount of blasting material 25 supplied depending on the condition of the surface to be treated 27 and other circumstances. Therefore, if the worker can control the amount of blasting material 25 supplied while checking the condition of the surface to be treated 27, efficient blasting can be performed while appropriately adjusting the amount of blasting material 25 used. For this reason, this blasting device 100 is equipped with an operating device 15 for adjusting the amount of blasting material 25 supplied and transmission means 13, 20, A for remotely transmitting the adjustment operation in the operating device 15 to the control units 11, 12. The control units 11, 12 control the amount of blasting material 25 supplied by the blasting material supply device 1 according to the adjustment operation transmitted by the transmission means 13, 20, A. Therefore, with this blasting apparatus 100, an operator facing the surface to be treated 27 (whether the operator using the injection device 24 or another operator not using the injection device 24) can remotely control the supply amount of blasting material 25 by operating the control device 15 according to the situation. For example, an operator can observe the condition of the surface to be treated 27 while performing paint stripping or dirt removal by blasting, or before and after blasting, and remotely adjust the supply amount of blasting material 25 according to the observation results, thereby controlling the amount of blasting material 25 injected per unit time. Furthermore, if the supply amount of blasting material 25 can be adjusted to zero by the control device 15, the spraying of blasting material 25 can be stopped remotely immediately after the work is completed. Thus, it becomes possible to spray the blasting material 25 appropriately.

[0038] The operating device 15 and the transmission means 13, 20, A that transmit its operation are not particularly limited, and the operating device 15 can be a mechanical switch or a wireless terminal such as a smartphone, and the transmission means can be wireless or wired electrical transmission means, etc., as appropriate. However, volatile organic solvents may be used in the workplace where blasting is performed, and the use of electrical equipment that could be an ignition source is undesirable in such an environment. Therefore, as shown in the example in Figure 2, the transmission means 13, 20, A can be configured with an air hose 20 that runs from the workplace where the surface to be treated 27 is located to the installation location of the blast material supply device 1, a compressed air supply source such as a compressor (not shown) that supplies compressed air A into the air hose 20, and a pressure sensor 13 that is provided on the base end portion of the air hose 20 located at the installation location of the blast material supply device 1 and detects the internal pressure of the air hose 20 and transmits it to the control units 11, 12, and the operating device 15 can be a pressure adjustment means that adjusts the pressure inside the air hose 20. Preferably, the operating device 15 is equipped with a pressure gauge 22 that measures and displays the pressure inside the air hose 20 for the worker to check. In this case, when the worker adjusts the pressure inside the air hose 20 using the pressure adjustment means, the pressure sensor 13 detects the pressure change inside the air hose 20 and transmits it to the control units 11 and 12, and the control units 11 and 12 can control the supply amount of blasting material 25 according to the pressure inside the air hose 20 received from the pressure sensor 13. For example, the relationship between the pressure inside the air hose 20 and the supply amount of blasting material 25 (in the illustrated example, the rotation speed of the electric motor 10 of the quantitative supply device 18) can be predetermined, and the control units 11 and 12 can control the supply amount of blasting material 25 based on this relationship. In this way, by transmitting the adjustment operation of the supply amount of blasting material 25 using air pressure, it can be used even in environments where ignition and explosion are possible.

[0039] The pressure adjustment means is not particularly limited as long as it can adjust the pressure inside the air hose 20. For example, as shown in Figure 4, a pressure adjustment means can be employed that changes the internal pressure while circulating compressed air inside the air hose 20. That is, in the example shown in Figure 4, a compressed air supply source such as an air compressor (not shown) is connected to the base end of the air hose 20, and the compressed air is configured to flow towards the tip. A tip-side flow control valve 28, such as a needle valve, is provided at the tip end of the air hose 20, and a base-side flow control valve, such as a needle valve, is provided in the flow path between the pressure sensor 13 and the compressed air supply source. In this case, it is preferable to provide a pressure stabilization bottle between the pressure sensor 13 and the base-side flow control valve. With this transmission means and pressure adjustment means, the pressure inside the air hose 20 can be changed by opening the tip-side flow control valve 28 and the base-side flow control valve to allow compressed air to flow into the air hose 20, and by operating the tip-side flow control valve 28 at the work site. However, this type requires compressed air to flow through the air hose 20, and therefore the response to pressure changes in response to operation, and consequently the response to adjusting the amount of blasting material 25 supplied, is not fast.

[0040] Therefore, as shown in Figure 1, it is preferable to change the internal pressure without flowing compressed air into the air hose 20. That is, in the example shown in Figure 1, a relief-type pressure reducing valve 23 is provided at the tip of the air hose 20, and a compressed air supply source (not shown) is connected to the primary side of the relief-type pressure reducing valve 23 to supply compressed air A into the air hose 20 via the relief-type pressure reducing valve 23, and a base-side on-off valve 14 such as a needle valve is provided at the base end of the air hose 20. Instead of the base-side on-off valve 14, it is also acceptable to simply close the base end opening of the air hose 20 with a cap or plug. In such a pressure adjustment means, when the base-side on-off valve 14 is closed (making the inside of the air hose 20 a closed space), and the relief-type pressure reducing valve 23 is set to a desired pressure and compressed air is supplied into the air hose 20 from the compressed air supply source, the pressure inside the air hose 20 rises and the relief-type pressure reducing valve 23 closes when it reaches the set pressure of the relief-type pressure reducing valve 23. Furthermore, even if the set pressure is subsequently adjusted, compressed air is supplied to the air hose 20 or the air in the air hose 20 is released by the relief function, causing the pressure inside the air hose 20 to change and reach the set pressure, at which point the pressure reducing valve 23 with relief closes. Therefore, the pressure inside the air hose 20 can be changed to the set pressure without supplying compressed air to the air hose 20, and the response to the pressure change in response to the operation, and consequently the response to the adjustment of the amount of blast material 25 supplied, becomes faster, resulting in improved operability.

[0041] The relationship between the pressure in the air hose 20 and the amount of blasting material 25 supplied can be determined as appropriate. For example, the pressure range in the air hose 20 can be set to 100 to 400 kPa, and the quantitative supply device 18 can change the supply speed of the blasting material 25 accordingly at a speed of 20 to 100% of the maximum supply speed. In this case, the quantitative supply device 18 can be set to stop when the pressure in the air hose 20 is 100 kPa or less for a predetermined time (e.g., 1 minute). [Industrial applicability]

[0042] The blasting apparatus of the present invention is suitably usable in the removal of paint during inspection and repair work on painted steel structures, etc., but is not limited to this and can be widely used for blasting treatment in general. [Explanation of Symbols]

[0043] 1...Blast material supply device, 10...Electric motor, 11...Inverter, 12...Controller, 11,12...Control unit, 13...Pressure sensor, 14...Base end on-off valve, 15...Operating device, 16...Mixing tube, 18...Quantitative supply device, 20...Air hose, 21...Transport hose, 22...Pressure gauge, 23...Pressure reducing valve with relief, 24...Injection device, 25...Blast material, 26...Workpiece, 27...Workpiece surface, 28...Tip end flow control valve, 31...First tank, 32...Second tank, 33...Third tank, 34...First on-off valve, 35...Second on-off valve, 100...Blasting device.

Claims

1. An injection device that injects blast material onto a surface to be treated, The injection device includes a transport hose for transporting the blast material, A blast material supply device that supplies the blast material to the injection device via the transport hose, A control unit for controlling the amount of blast material supplied in the blast material supply device, An operating device for adjusting the supply amount of the blasting material, The device comprises a transmission means for remotely transmitting the adjustment operation of the operating device to the control unit, The control unit controls the amount of blast material supplied to the blast material supply device in accordance with the adjustment operation transmitted by the transmission means. The transmission means includes an air hose that runs from the work area where the surface to be processed is located to the installation location of the blast material supply device, a compressed air supply source that supplies compressed air into the air hose, and a pressure sensor provided on the base end portion of the air hose located at the installation location of the blast material supply device, which detects the internal pressure of the air hose and transmits it to the control unit. The operating device includes pressure regulating means for adjusting the pressure in the air hose, The pressure sensor detects the pressure change in the air hose caused by the pressure adjustment operation of the pressure adjustment means and transmits it to the control unit, and the control unit controls the amount of blast material supplied according to the pressure in the air hose received from the pressure sensor. A blasting device characterized by the following features.

2. The pressure regulating means includes a relief pressure reducing valve provided on the tip portion of the air hose located at the work area, and means for creating a closed space inside the air hose. The compressed air supply source supplies compressed air into the air hose via the relief-equipped pressure reducing valve. The blast apparatus according to claim 1.

3. The blasting material is configured to be transported by compressed air supplied to the injection device via the blasting material supply device and the transport hose. The blast material supply device comprises a first tank located in the upper section for storing the blast material, a second tank located in the middle section and communicating with the first tank, and a third tank located in the lower section and communicating with the second tank. A first on-off valve is provided at the communication point between the first tank and the second tank, and a second on-off valve is provided at the communication point between the second tank and the third tank. The first and second on-off valves are opened and closed in such a way that they do not open simultaneously, thereby supplying the blast material from the first tank to the second and third tanks in sequence. The system includes a quantitative supply device that quantitatively supplies the blast material in the third tank to the transport hose, The blast apparatus according to claim 1.

4. An injection device that injects blast material onto a surface to be treated, The injection device includes a transport hose for transporting the blast material, A blast material supply device that supplies the blast material to the injection device via the transport hose, A control unit for controlling the amount of blast material supplied in the blast material supply device, An operating device for adjusting the supply amount of the blasting material, A blast treatment method using a blast treatment apparatus, comprising a transmission means for remotely transmitting the adjustment operation of the operating device to the control unit, In a work area where a surface to be processed exists, an operator performs the adjustment operation using the operating device, and the control unit controls the amount of blast material supplied to the blast material supply device in accordance with the adjustment operation transmitted by the transmission means. The transmission means includes an air hose that runs from the work area where the surface to be processed is located to the installation location of the blast material supply device, a compressed air supply source that supplies compressed air into the air hose, and a pressure sensor provided on the base end portion of the air hose located at the installation location of the blast material supply device, which detects the internal pressure of the air hose and transmits it to the control unit. The operating device includes pressure regulating means for adjusting the pressure in the air hose, The pressure sensor detects the pressure change in the air hose caused by the pressure adjustment operation of the pressure adjustment means and transmits it to the control unit, and the control unit controls the amount of blast material supplied according to the pressure in the air hose received from the pressure sensor. A blast treatment method characterized by the following features.

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