Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
  • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
  • B65G53/16—Gas pressure systems operating with fluidisation of the materials
  • B65G53/18—Gas pressure systems operating with fluidisation of the materials through a porous wall
  • B65G53/20—Gas pressure systems operating with fluidisation of the materials through a porous wall of an air slide, e.g. a trough
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
  • B65G53/34—Details
  • B65G53/52—Adaptations of pipes or tubes
  • B65G53/525—Adaptations of pipes or tubes for conveyance in plug-form

Definitions

• the present invention relates to a device for transporting and distributing products in powder or granules comprising a pressure vessel containing the product and the outlet of which is connected to a substantially horizontal main tube provided with at least one orifice.
• pressurized air is sent into the main tubing causing a high speed flow of the product and a cloud of dust at the outlet of the orifice of the tubing.
• the device according to the invention allows flow at low speed without any risk of plugging.
• each orifice is associated with a valve and in that said device comprises porous means separating the main tubing into an upper channel conveying the powders or the granules and a lower channel supplied with compressed air by means of supply and control means for controlling the intermittent opening of each valve, the opening time being sufficiently short compared to the closing time so that the pressure of the tank remains substantially constant.
• the product is fluidized in the upper channel of the tubing supplied by the lower channel with compressed air.
• the air supply in the lower channel is used to balance the pressure in the entire tubing and in the tank.
• each valve is connected to a substantially horizontal secondary tube and open at its end and comprising porous means separating this tubing in an upper channel conveying the powders or the granules and a lower channel supplied with compressed air by secondary supply means, said supply means being controlled by the control means to supply compressed air.
• each secondary tubing is orientable relative to the main tubing.
• Figure 1 shows a side view of the device according to the invention.
• FIG. 2 represents a top view of the device according to the invention.
• FIG. 3 represents a front view of part of the device according to the invention with its pneumatic control.
• Figure 4 shows a longitudinal section of a pipe.
• Figure 5 shows a longitudinal section of the terminal pipe.
• Figures 6 and 7 show cross sections of the pipe shown in Figure 4.
• the device according to the invention ( Figures 1 and 2) comprises a tank 1 fed by a funnel 2 via a butterfly valve 3.
• the tank 1 includes a purge valve 4.
• An isolated compressed air source 5, by a valve ⁇ is connected to a regulator regulator 7 which supplies by a valve 8 the top of the tank 1 whose pressure is controlled by a pressure gauge 9.
• the outlet of the regulator 7 is also connected by a line 10 to a tap 17 which when open allows injection under porous walls 18 to fluidize the product in the cone of the bottom of the tank.
• This cone ends in a bend 19 connected to a horizontal main tube 20 by a union fitting 21.
• This tubing 20 is made up of several pipes 22 connected by unions 21 or by tees 23 having an orifice 27 connected by a swivel fitting 24 to an elbow 25 closed by a valve 26.
• the device shown comprises six tees 23.
• the end of the main tube 20 is closed by a plug 28 which can be removed to clean the inside of the tube 20.
• Each valve 26 is connected to a secondary tube 29 consisting of pipes 22 followed by a pipe 30 leading to the outside. These pipes 22 and 30 are connected by union fittings 21.
• the interior of the conduits 22 (see FIGS. 4 and 6) of the main tube 20 and the secondary tubes 29 is separated into an upper part 31 and a lower part 32 by a porous wall 33 made for example of sintered metal.
• the seal between the pipe wall and the porous wall is obtained by the use of a ceramic fiber felt 34.
• the porous wall 33 is held in position by a series of screws 36 secured to the porous wall 33 by washers. sealing 37 and nuts 38.
• This porous wall 33 is fixed to the pipe by seals 39 and nuts 40 (see FIGS. 4 and 7).
• the lower channel 32 is provided with a first thread 41 and a second thread 42. In the main pipe 20, all the threads are connected to the pipe 10. All of the upper parts 31 and all of the lower parts 32 define in the conduits 22 of the main pipe 20 one an upper channel 43 the other a lower channel 44.
• the set of upper parts 31 and the set of lower parts 32 of the conduits 22 and 30 of each secondary tube 29 one defines an upper channel 45 the other a lower channel 46 (see FIG. 3).
• the pressure source 5 is applied to a second regulator 47 whose output is applied to solenoid valves 48 associated with the valves 26.
• Each solenoid valve 48 has a first outlet 4g connected by a line 50 to the control input of the valve 26 and a second outlet 51 connected by a pressure reducer 52 to a compressed air supply line 53.
• This line 53 is connected to the first thread 41 of the first pipe 22 of the secondary pipe 29.
• small pipes 54 connect the second thread 42 of a pipe 22 of the secondary pipe 29 to the first thread 41 of the next pipe (22 or 30).
• the second internal thread 42 of the last pipe 30 close to the opening 55 of this pipe is blocked (see FIG. 5).
• the valve 26 In a first position of the solenoid valve 48, the valve 26 is closed and the line 53 is not supplied (shown in FIG. 3).
• valve 26 In the second position, the valve 26 is open and the line 53 is supplied.
• Means 56 for controlling the opening and closing of the valves 26 send cyclic opening signals to the various solenoid valves 48.
• the operation of the device according to the invention is as follows.
• the secondary pipes 29 isolated by the valves 26 are in communication with atmospheric pressure through their outlet opening 55 and through line 53 which is connected to the atmosphere by the associated solenoid valve 48.
• the solenoid valve 48 associated with a valve 26 When the solenoid valve 48 associated with a valve 26 is energized, it reverses the positions so that the pipe 50 is vented which causes the valve 26 to open and the pipe 53 is brought to the pressure p 2 (1.4 bar absolute) determined by the regulator 52 thus supplying the channel lower 46 of the secondary tubing 29.
• valve 26 When the valve 26 opens, due to the pressure difference between the upstream (1.6 bar absolute) and the downstream (1 bar absolute) of the valve 26, there is an expansion effect causing a relatively high flow rate of product obtained instantaneously and ensuring operation without inertia. At the same time, the pressure upstream of the valve 26 open in the upper channel 43 tends to drop rapidly while the pressure is kept constant under the porous wall 33 in the lower channel 44.
• the control means 56 also cyclically control the various solenoid valves 48 so that the valves 26 open independently of each other. In addition, it is necessary that the closing time is sufficiently long with respect to the opening time so that the pressure of the tank does not vary appreciably.
• valves 26 For certain applications, it would be possible not to use secondary pipes 29, there would then be only one or more valves 26 whose outlet would supply the product when the valve 26 is opened.
• the device according to the invention is on board a mobile cart. Two carts are used, one of which is recharged with powders or granules while the other is in operation.
• the adjustment of the flow rate is obtained by modifying the opening frequency of the valves by acting on the control means 56.
• the orders making it possible to modify the frequency can be obtained by a regulation system associated with a powder layer thickness controller. or granules or else only depend on the flow speed of the molten steel.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Air Transport Of Granular Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9305799

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (1)

Citations (3)

• 1984
  • 1984-07-04 FR FR8410625A patent/FR2567111A1/fr active Pending
• 1985
  • 1985-07-04 WO PCT/FR1985/000190 patent/WO1986000604A1/fr not_active Application Discontinuation
  • 1985-07-04 JP JP50311385A patent/JPS61502602A/ja active Pending
  • 1985-07-04 EP EP19850903305 patent/EP0187797A1/fr not_active Withdrawn

Patent Citations (3)

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