Blasting Chamber

Abstract

A blasting chamber capable of conducting painting on a workpiece subsequent to a blasting process in the same working chamber is provided. A dust collection unit 20 that ventilates a main unit 10 during blasting work and a ventilation unit 30 that ventilates a main unit during a painting step are provided. A side wall 11 of the main unit is provided with an entrance 11 a and an opening-and-closing member 11 b that opens/closes the entrance, the dust collection unit is provided so as to project from a roof panel 15 to a floor panel 16 at a position closer to an other side wall 12 that is opposed to this side wall so as to partition the interior of the main unit, and a working space 10 a and a ventilation duct 10 b are defined in the main unit. A roof panel 15 above a working space has air suction holes 17 formed therein, and an intake opening 22 that communicates between the dust collection unit and the ventilation duct is provided. The side wall is provided with an opening 12 a that communicates between the ventilation unit and the ventilation duct, and during the blasting process, ventilation is conducted with the dust collection unit with the entrance closed, and during painting, ventilation is conducted with the ventilation unit with the entrance opened.

1 . A blasting chamber comprising:
 a main unit;   a dust collection unit; and   a ventilation unit;   wherein   the main unit defines a space with side walls, a roof panel, and a floor panel;   any one side wall of the main unit is provided with an entrance that allows a workpiece to be carried in and out and a worker to enter and exit the blasting chamber and an opening-and-closing member that opens/closes the entrance;   a partition wall that is arranged so as to project, in the main unit at a side of an other side wall that is opposed to said one side wall, from the roof panel to the floor panel so that a lower end of the partition wall is separated from the floor panel is provided;   a working space is formed between said one side wall and the partition wall by dividing a space in the main unit with the partition wall;   a ventilation duct, a lower end of which communicates with the working space, is formed between the partition wall and said other side wall;   a number of air suction holes that introduces outside air into the working space is formed in the roof panel above the working space;   the dust collection unit and the ventilation unit each communicate with the ventilation duct;   the dust collection unit is operated during blasting work with a set wind velocity in the ventilation duct of less than a suspension velocity of an abrasive to be used; and   the ventilation unit is operated during a painting step with a predetermined intake wind velocity.   
     
     
         2 . A blasting chamber according to  claim 1 , wherein the partition wall is formed by arranging either one of the dust collection unit or the ventilation unit so as to project into the main unit, and an intake opening of the dust collection unit or the ventilation unit that constitutes the partition wall is formed on a surface of the partition wall opposed to said other side wall; and
 said other side wall is formed with an opening that communicates between the ventilation duct and the other side of the dust collection unit or the ventilation unit.   
     
     
         3 . A blasting chamber according to  claim 2 , further comprising a first opening-and-closing means that opens/closes the opening. 
     
     
         4 . A blasting chamber according to  claim 1 , wherein an intake airflow rate per minute by the dust collection unit is equal to or more than 1.5 times a volume of the main unit. 
     
     
         5 . A blasting chamber according to  claim 2 , wherein the ventilation unit is provided with a baffle plate as a means for capturing paint particles. 
     
     
         6 . A blasting chamber according to  claim 1 , wherein an airflow velocity in the working space generated by ventilation by the ventilation unit is equal to or more than 0.4 m/s. 
     
     
         7 . A blasting chamber according to  claim 2 , wherein an airflow velocity in the working space generated by ventilation by the ventilation unit is equal to or more than 0.4 m/s. 
     
     
         8 . A blasting chamber according to  claim 1 , wherein an intake airflow rate by the ventilation unit is 2 to 7 times an intake airflow rate by the dust collection unit. 
     
     
         9 . A blasting chamber according to  claim 2 , wherein an intake airflow rate by the ventilation unit is 2 to 7 times an intake airflow rate by the dust collection unit. 
     
     
         10 . A blasting chamber according to  claim 1 , further comprising:
 an abrasive collection unit constituted with an abrasive collecting duct, one end of which opens toward the working space at a lower end position of any one side wall of the main unit; a cyclone, an inlet of which communicates with the other end of the abrasive collecting duct; and an exhaust duct, one end of which communicates with an air outlet of the cyclone and an other end of which communicates with the ventilation duct;   a second opening-and-closing means that allows/prevents communication between the exhaust duct and the intake opening of the dust collection unit; and   a third opening-and-closing means that opens/closes a flow path in the ventilation duct below a communication position between the dust collection unit and the ventilation unit.   
     
     
         11 . A blasting chamber according to  claim 10 , further comprising a flexible abrasive collecting hose provided so as to be attachable to an opening portion of the abrasive collecting duct. 
     
     
         12 . A blasting chamber according to  claim 10 , wherein an abrasive collecting space is formed between the floor panel and a perforated plate by laying the perforated plate on the floor panel with a predetermined clearance therebetween in the working space, and the abrasive collection unit is formed by communicating the abrasive collecting duct that opens toward the collecting space with the inlet of the cyclone and by communicating the exhaust duct that communicates with the air outlet of the cyclone with a dust collector equipped with an air-exhaust ventilator, and
 a shutting means that shuts holes in the perforated plate during a painting step is provided.