Blasting systems and methods

Abstract

To provide a blast system capable of improving the system operation rate. [Solution] The blast system comprises a hopper tank, a continuous supply device, a moisture blast main unit, a blast injection device that injects abrasive material together with water mist, a vacuum hose that vacuum collects grinding chips containing the abrasive material sprayed from the blast injection device and used to grind the workpiece, moisture derived from the water mist, and coating chips that have peeled off from the workpiece, a dryer that dries the grinding chips collected by the vacuum hose, a sorting device that separates the abrasive material and coating chips from the grinding chips dried by the dryer and deposits the abrasive material separated from the grinding chips into a hopper tank, and a dust collection device that collects the coating chips separated by the sorting device.

Description

[Technical Field]

[0001] This specification discloses technology relating to a blasting system and a blasting method. [Background technology]

[0002] When repairing relatively large steel structures such as bridges, blasting is performed to remove old paint and rust from the surface of the structure.

[0003] Patent Document 1 describes a blasting system for wet blasting in which abrasives are sprayed together with water mist. Patent Document 1 also describes the reuse of abrasives recovered from the grinding debris generated during the blasting process. The grinding debris contains not only the abrasives, but also moisture derived from the water mist and coating debris. In the blasting system of Patent Document 1, the abrasives are sorted from the grinding debris and then washed and dried to regenerate the abrasives. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-35137 Summary of the Invention [Problem to be solved by the invention]

[0005] The blasting system of Patent Document 1 had the problem that during the process of regenerating the abrasives, the grinding chips, abrasives, and coating chips containing moisture tend to clog various parts of the system, resulting in a decrease in the system's operating rate. [Means for solving the problem]

[0006] The technology disclosed in this specification can be realized in the following forms.

[0007] (1) One aspect disclosed in this specification is a blast system for grinding a workpiece. The blast system includes a hopper tank for storing abrasives, a continuous supply device for sending a blast fluid obtained by mixing the abrasives from the hopper tank with a compressed air flow to a first hose, a moisture blast main body device for sending an air-water mixture obtained by mixing water with a compressed air flow to a second hose, a blast injection device for injecting the abrasives together with a water mist by pressurizing and injecting the air-water mixture supplied from the second hose into the blast fluid supplied from the first hose at a pressure higher than that of the blast fluid, and a blast injection device for injecting the abrasives together with a water mist. The blasting system includes a vacuum hose that vacuum-collects grinding chips containing the abrasives sprayed from the spraying device and used to grind the workpiece, moisture derived from the water mist, and coating chips peeled off from the workpiece; a dryer that dries the grinding chips collected by the vacuum hose; a sorting device that separates the abrasives and coating chips from the grinding chips dried by the dryer and deposits the separated abrasives into the hopper tank; and a dust collection device that collects the coating chips separated by the sorting device. This type of blasting system dries the collected grinding chips, separates them into abrasives and coating chips, and reuses the abrasives while collecting the coating chips. This prevents system shutdowns due to moisture clogging the system during the abrasive recycling process. As a result, the system operating rate of the blasting system is improved.

[0008] (2) In the above-described blasting system, the dryer may include: a storage section for storing the grinding chips collected by the vacuum hose; a grinding chip flow path provided below the storage section and formed by a partition plate with ventilation holes for allowing the grinding chips to flow down from the storage section; a drying section formed between the grinding chip flow path and a hot air path for blowing hot air into the grinding chip flow path and a suction exhaust path for sucking air from the grinding chip flow path; and a collection section provided below the drying section for collecting the grinding chips that have passed through the drying section and transporting the grinding chips to the sorting device. This type of blasting system can efficiently dry water-containing grinding chips.

[0009] (3) One embodiment disclosed in this specification is a blasting method for grinding an object to be ground. This blasting method includes storing abrasives in a hopper tank; using a continuous supply device, sending a blasting fluid obtained by mixing the abrasives from the hopper tank with a compressed air flow to a first hose; using a moisture blast main unit, sending an air-water mixture obtained by mixing water with a compressed air flow to a second hose; using a blast injection device, spraying the abrasives together with a water mist by pressurizing and injecting the air-water mixture supplied from the second hose into the blasting fluid supplied from the first hose at a pressure higher than that of the blasting fluid; and using a vacuum hose. The blasting method uses a vacuum hose to vacuum collect grinding chips containing the abrasives sprayed from the blasting device and used to grind the workpiece, moisture from the water mist, and coating chips peeled off from the workpiece; a dryer is used to dry the grinding chips collected by the vacuum hose; a sorting device is used to separate the abrasives and coating chips from the grinding chips dried by the dryer, and the abrasives separated from the grinding chips are placed in the hopper tank; and a dust collection device is used to collect the coating chips separated by the sorting device. This type of blasting method prevents work stoppages during the abrasive recycling process due to moisture clogging the grinding chips, abrasives, and coating chips. As a result, the work efficiency of the blasting method can be improved.

[0010] (4) In the above-described blasting method, in the step of drying the grinding chips, the grinding chips collected by the vacuum hose are stored in a storage section; in a drying section provided below the storage section, the grinding chips are allowed to flow down from the storage section into a grinding chip flow path formed by a partition plate with holes that allow ventilation between a hot air path for discharging hot air and a suction / exhaust path for sucking air; and in a collecting section provided below the drying section, the grinding chips that have passed through the drying section are collected and transported to the sorting device. This type of blasting method can efficiently dry grinding chips containing moisture.

[0011] The technology disclosed in this specification can be realized in various forms other than blast systems and blast methods, such as a device constituting a blast system, a dryer for a blast system, and a method for drying grinding chips. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram showing a blast system. [Figure 2] FIG. 2 is an explanatory diagram showing a detailed configuration of a dryer. DETAILED DESCRIPTION OF THE INVENTION

[0013] FIG. 1 is an explanatory diagram showing a blasting system 10. The blasting system 10 is a system for performing wet blasting while reusing abrasives. The blasting process of the blasting system 10 complies with the moist blasting method (Japanese Industrial Standard JIS Z0310:2016). The blasting system 10 grinds the workpiece 800 using blast 710, which is an abrasive sprayed together with a water mist. The workpiece 800 is a relatively large steel structure such as a bridge. At a blasting work site, grinding debris 720 is generated. The grinding debris 720 contains the abrasive used in the blasting process, moisture derived from the water mist, and paint debris that has peeled off from the workpiece 800.

[0014] The blast system 10 includes a hopper tank 110, a continuous supply device 120, a moisture blast main body device 140, and a blast injection device 150 as components for generating the blast 710.

[0015] The hopper tank 110 of the blasting system 10 is a container for storing abrasives. In addition to new abrasives, abrasives recycled from grinding waste 720 are fed into the hopper tank 110.

[0016] The continuous supply device 120 of the blasting system 10 sends a blasting fluid, which is a mixture of abrasive material supplied from the hopper tank 110 and compressed air, to the first hose 130. The continuous supply device 120 is equipped with an air compressor 125 that generates compressed air. The air compressor 125 generates compressed air to be supplied to the continuous supply device 120.

[0017] The moisture blast main unit 140 of the blast system 10 delivers an air-water mixture fluid, which is a mixture of compressed air and water, to a second hose 145. The moisture blast main unit 140 is equipped with a water tank 142, a water pump 144, and an air compressor 146. The water tank 142 stores water to be supplied to the moisture blast main unit 140. The water pump 144 delivers water from the water tank 142 to the moisture blast main unit 140. The air compressor 146 generates compressed air to be supplied to the moisture blast main unit 140. The air compressor 146 may be an integrated unit with the air compressor 125.

[0018] The blast injection device 150 of the blasting system 10 injects an air-water mixture fluid supplied from the second hose 145 into the blasting fluid supplied from the first hose 130 at a pressure higher than that of the blasting fluid, thereby injecting abrasive material together with water mist as blast 710. The blast injection device 150 is a device that is held and operated by a worker.

[0019] The blasting system 10 includes a vacuum hose 210, a dryer 300, an elevator 230, a sorting device 240, a dust recovery device 250, and a vacuum recovery device 260 as components for regenerating the abrasive material.

[0020] The vacuum hose 210 of the blasting system 10 is a hose that vacuum-collects the grinding chips 720. The vacuum hose 210 transports the grinding chips 720 generated at the work site to the dryer 300. The vacuum hose 210 transports the grinding chips 720 to the dryer 300 based on the difference between the vacuum generated by the vacuum collection device 260 and atmospheric pressure.

[0021] The dryer 300 of the blasting system 10 dries the grinding chips 720 collected by the vacuum hose 210. The detailed configuration of the dryer 300 will be described later.

[0022] The elevator 230 of the blasting system 10 transports the grinding chips 720 dried in the dryer 300 to the sorting device 240.

[0023] The sorting device 240 of the blasting system 10 separates abrasives and coating debris from the grinding debris 720 dried by the dryer 300, and feeds the abrasives separated from the grinding debris into the hopper tank 110. The sorting device 240 is provided above the hopper tank 110. The sorting device 240 separates the grinding debris 720 using an airflow based on the difference between the vacuum generated by the vacuum recovery device 260 and atmospheric pressure. In the sorting device 240, relatively light coating debris is transported by the airflow to the dust recovery device 250. In the sorting device 240, relatively heavy abrasives drop out of the airflow and are fed into the hopper tank 110.

[0024] The dust collection device 250 of the blasting system 10 collects the coating debris sorted out by the sorting device 240. The sorting device 240 collects the coating debris using an air flow based on the difference between the vacuum generated by the vacuum collection device 260 and atmospheric pressure.

[0025] The vacuum collection device 260 of the blasting system 10 generates a vacuum for the vacuum hose 210, the screening device 240, the dust collection device 250 and the dryer 300.

[0026] 2 is an explanatory diagram showing a detailed configuration of the dryer 300. The dryer 300 includes a storage section 310, a drying section 320, and a collection section 330.

[0027] The storage section 310 of the dryer 300 is a space for storing the grinding chips 720 collected by the vacuum hose 130.

[0028] The drying section 320 of the dryer 300 is provided below the storage section 310. In the drying section 320, a partition plate 321 having ventilation holes forms a grinding chip flow down path 322 between the hot air paths 324, 325 and the suction exhaust path 326. The grinding chip flow down path 322 causes grinding chips 720 to flow down from the storage section 310. The hot air paths 324, 325 cause hot air to flow into the grinding chip flow down path 322. The suction exhaust path 326 sucks air from the grinding chip flow down path 322.

[0029] The drying section 320 of the dryer 300 includes a combustion chamber 342. The combustion chamber 342 supplies hot air to the hot air ducts 324, 325 by heating outside air with the heat of combustion generated by burning fuel. The combustion chamber 342 is provided below the hot air duct 324. A far-infrared radiation paint is applied to the surface of an outer shell 344 that covers the combustion chamber 342. This allows the outer shell 344 to function as a far-infrared radiation radiator and radiate far-infrared rays toward the grinding chips 720 in the collection section 330.

[0030] The collection section 330 of the dryer 300 is provided below the drying section 320. The collection section 330 collects the grinding chips 720 that have passed through the drying section 320. The collection section 330 includes a conveying device 338. The conveying device 338 cooperates with the elevator 230 to convey the grinding chips that have collected below the dryer 300 to the sorting device 240. The conveying device 338 is a spiral conveyor.

[0031] According to the blasting system 10 described above, the collected grinding chips 720 are dried, and then the abrasive and coating chips are separated. The abrasive is reused and the coating chips are collected. This prevents the system from shutting down due to clogging of the system caused by moisture in the grinding chips, abrasive, and coating chips during the abrasive recycling process. As a result, the system operating rate of the blasting system 10 can be improved. Furthermore, the dryer 300 can efficiently dry the grinding chips 720 containing moisture.

[0032] The technology disclosed in this specification is not limited to the above-described embodiments, examples, and modifications. The technology disclosed in this specification can be realized in various configurations without departing from the spirit thereof. Among the technical features in the above-described embodiments, examples, and modifications, those corresponding to the technical features in each form described in the Summary of the Invention section can be replaced or combined to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Furthermore, technical features not described as essential in this specification can be deleted as necessary. [Explanation of symbols]

[0033] 10...Blast System 110...Hopper tank 120...Continuous supply device 125...Air compressor 130...First hose 130...Vacuum hose 140...Moisture blast main unit 142...Water tank 144...Water pump 145...Second hose 146...Air compressor 150...Blast injection device 210...Vacuum hose 230...Elevator 240...Sorting device 250...Dust collection device 260...Vacuum recovery device 300...Dryer 310...Storage section 320...Drying section 321...Partition board 322...Grinding chip flow path 324…Hot air path 326…Suction and exhaust duct 330...Collection Department 338...Transportation equipment 342...Combustion chamber 344...Outer shell 710...Blast 720...Grinding dust 800...Workpiece

Claims

1. A blast system for grinding an object to be ground, comprising: a hopper tank for storing abrasives; a continuous supply device that delivers a blasting fluid obtained by mixing the abrasive material with a compressed air flow from the hopper tank to a first hose; a moisture blast main body device that delivers an air-water mixture fluid obtained by mixing water with a compressed air flow to a second hose; a blast injection device that injects abrasives together with water mist by pressurizing and injecting the air-water mixed fluid supplied from the second hose into the blast fluid supplied from the first hose at a pressure higher than that of the blast fluid; a vacuum hose for vacuum-collecting grinding chips containing the abrasive sprayed from the blast spray device and used to grind the object to be ground, moisture derived from the water mist, and coating chips peeled off from the object to be ground; a dryer that dries the grinding chips collected by the vacuum hose; a sorting device that sorts the abrasive and the coating scraps from the grinding scraps dried by the dryer and pours the abrasive sorted from the grinding scraps into the hopper tank; a dust collection device that collects the coating debris sorted by the sorting device; Equipped with The dryer is a storage section that stores the grinding chips collected by the vacuum hose; a drying section provided below the storage section, which is formed by a partition plate having ventilation holes to form a grinding chip flow-down path for causing the grinding chips to flow down from the storage section, between a hot air path for blowing hot air into the grinding chip flow-down path and a suction exhaust path for sucking air from the grinding chip flow-down path; a collecting section provided below the drying section, which collects the grinding chips that have passed through the drying section and transports the grinding chips to the sorting device; Including, the blast system.

2. A blasting method for grinding an object to be ground, The abrasive material is stored in a hopper tank, Using a continuous supply device, a blasting fluid obtained by mixing the abrasive material with a compressed air flow from the hopper tank is delivered to a first hose; Using the moisture blast main body device, an air-water mixture fluid obtained by mixing water with a compressed air flow is delivered to the second hose; a blast injection device is used to inject the air-water mixture fluid supplied from the second hose into the blast fluid supplied from the first hose at a pressure higher than that of the blast fluid, thereby injecting an abrasive together with a water mist; Using a vacuum hose, grinding chips containing the abrasive sprayed from the blast spray device and used to grind the object to be ground, moisture derived from the water mist, and coating chips peeled off from the object to be ground are vacuum recovered; using a dryer to dry the grinding chips collected by the vacuum hose; Using a sorting device, the abrasive and the coating scraps are sorted from the grinding scraps dried by the dryer, and the abrasive sorted from the grinding scraps is introduced into the hopper tank; a dust collection device for collecting the coating waste separated by the separation device; In the step of drying the grinding chips, The grinding chips collected by the vacuum hose are stored in a storage section; In a drying section provided below the storage section, the grinding chips are allowed to flow down from the storage section into a grinding chip flow-down path formed by a partition plate having holes that allow ventilation between a hot air path for flowing hot air and a suction / exhaust path for sucking air, A blasting method in which the grinding chips that have passed through the drying section are collected in a collection section provided below the drying section, and the grinding chips are transported to the sorting device.

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