JPH11189281A - Method and device for discharging powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely discharge a powder in a bag without residuals by connecting the discharge opening to a vacuumizing means for a sucking transportation means of the powder to communicate with each other and connecting a powder hopper to a pressurizing means to communicate with each other after a drum has been tumbled over together with the powder hopper to drop the powder in the bag into the hopper. SOLUTION: When a drum 40 holding bags in which a powder is contained is transferred to a discharge position, a drum support body 37 is raised and the upper face opening of the drum 40 is closely attached to the opening 26 of a hopper 8 and kept in the state. Then, a tumbler M is turned 180 deg. to drop the powder in the bag into the receive hopper 8. Subsequently, compressed air is supplied from an air compressor to the outside of the bag through a supply pipe 80 to apply a positive pressure onto the outside of the bag. And an automatic suction valve and an automatic discharge valve of a sucking transportation pipe are opened and a negative pressure acts in the bag inside and hence, the powder is smoothly dropped into the transportation pipe. In this way, the powder in the bag is dropped into the sucking transportation pipe without residuals and conveyed pneumatically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for discharging powder from a bag made of a synthetic resin such as polyvinyl chloride, for example, contained in a drum having an open upper end.

[0002]

2. Description of the Related Art When powder is directly stored in a drum (eg, a fiber drum) as a container and transported to a powder transport line, the powder is easily sucked from the drum in the powder transport line. Can be discharged. However, if the powder contained in the drum is a paint or a chemical, the drum must be cleaned when the drum is reused after discharging the powder, which is inefficient. Therefore, for example, the powder is stored in a bag made of a synthetic resin such as polyvinyl chloride or a paper bag whose inner surface is laminated with an appropriate material, and the bag is stored in a drum and transported to a transport line. In this method, a method is conceivable in which the upper end of the bag in the drum is opened, a suction tube is inserted into the bag, and the powder is discharged from the bag by suction. According to this method, it is not necessary to clean the drum as described above, and thus the efficiency is improved. However, when the suction tube is inserted into the bag in the drum and the powder is sucked from the bag, when the remaining amount of the powder becomes small, the bag itself is sucked into the suction tube and the suction of the powder is hindered. You. As a result, it is extremely difficult, if not impossible, to exhaust the powder from the bag substantially completely without any remaining amount.

[0003]

In order to solve the above technical problem, the upper end of the bag accommodated in the drum is opened, and the entire periphery of the upper end is brought into close contact with the upper end of the opening of the drum. The opening of the drum at the receiving opening of the powder receiving hopper, which has a receiving opening on the side and a discharge opening on the other end, and the discharge opening is arranged on the upper side with the receiving opening on the lower side. The powder in the bag is dropped into the powder receiving hopper by inverting the powder receiving hopper together with the drum so that the upper end is tightly fixed and the discharge opening is on the lower side and the receiving opening is on the upper side. Then, it is possible to propose a method of discharging the powder in the powder receiving hopper by connecting the discharge port to the negative pressure generating means of the powder suction and transport means.

In this method, the powder stored in the bag is dropped into a powder receiving hopper with the bag stored in the drum, and the powder stored in the bag is sucked and discharged from a discharge port. The drum is intended to be completely discharged with no remaining amount, but due to the reversal of the drum, the bag falls into the powder receiving hopper together with the powder, and further, the negative pressure in the powder receiving hopper generated by the suction and transport of the powder. The bag tends to be sucked into the powder receiving hopper by pressure. Due to these phenomena, smooth and reliable discharge of the powder is hindered, and a part of the powder is left in the bag and the powder receiving hopper.

The present invention has been made on the basis of the above facts, and a first technical problem of the present invention is to provide a novel method capable of discharging powder contained in a bag substantially completely without any remaining amount. It is to provide a method of discharging a fine powder.

A second technical object of the present invention is to provide a novel powder discharging device capable of discharging powder contained in a bag substantially completely without any remaining amount.

[0007]

According to the present invention, in order to attain the first technical object, according to the present invention, the entire circumference of the upper end portion of an opened powder bag stored in a drum having an open upper end portion. The opening is in close contact with the upper end of the opening, the receiving opening is provided at one end, the outlet is provided at the other end, and the outlet is disposed on the upper side, and the receiving opening is disposed on the lower side. After holding the upper end of the opening of the drum in close contact with the receiving opening of the powder receiving hopper, the powder receiving unit is positioned such that the discharge opening is located on the lower side and the receiving opening is located on the upper side. The powder in the bag is dropped by inverting the hopper together with the drum to drop the powder in the bag into the powder receiving hopper. The powder in the receiving hopper is discharged, and the powder receiving hopper is communicated with the positive pressure generating means of the pressurized gas supply means to discharge the powder. Inflating the bag by pressurizing the supply pressure gas the powder receiving hopper to the body receiving hopper, the method for discharging powder, characterized in that, it is provided.

In the above invention, after the powder in the bag is dropped into the powder receiving hopper by inverting the drum together with the powder receiving hopper, the discharge port is connected to the negative pressure generating means of the powder suction and transport means. Not only discharges the powder in the powder receiving hopper but also connects the powder receiving hopper to the positive pressure generating means of the pressurized gas supply means to supply the pressurized gas into the powder receiving hopper. Since the bag is expanded by pressurizing the inside of the body receiving hopper, the bag is reliably prevented from falling into the powder receiving hopper and being sucked into the powder receiving hopper, and the powder is stored in the bag. And the powder is smoothly and reliably discharged from the powder receiving hopper. As a result, the powder stored in the bag can be substantially completely discharged without any remaining amount.

[0009] While discharging the powder in the powder receiving hopper by connecting the discharge port to the negative pressure generating means of the suction transporting means, a pressurized gas is continuously or continuously supplied into the powder receiving hopper. It is preferable to supply it intermittently. In the present invention,
A pressurized gas can be continuously supplied into the powder receiving hopper while discharging the powder in the powder receiving hopper, and the powder stored in the bag is retained while ensuring the powder discharging efficiency. It can be exhausted virtually completely without volume. This method can be said to be suitable for discharging relatively easily flowing powder.
In the present invention, further, the pressurized gas can be intermittently supplied into the powder receiving hopper while discharging the powder in the powder receiving hopper, and the powder can be discharged into the bag while ensuring the powder discharging efficiency. The stored powder can be substantially completely discharged without any remaining amount. In particular, by intermittently supplying the pressurized gas into the powder receiving hopper, the powder adhering to the inner surface of the bag can be effectively separated, and the discharging of the powder in the bag can be performed more effectively. Is done. This method can be said to be suitable for discharging relatively hard-to-flow powder.

It is preferable that the pressurized gas is intermittently supplied into the powder receiving hopper, and when the pressurized gas is supplied, the inside of the powder receiving hopper is substantially sealed. According to the present invention, the flushing effect on the bag is high, so that the powder adhering particularly to the inner surface of the bag can be more effectively peeled off, and the discharge of the powder in the bag can be performed more effectively.

According to the present invention, there is provided a powder receiving hopper having a receiving opening at one end and a discharging opening at the other end. A reversing machine disposed so that the receiving opening is located on the lower side, and the discharge opening is located on the lower side, and the powder receiving hopper can be inverted so that the receiving opening is located on the upper side. A drum having an opening upper end, and a powder-containing bag housed in a state where the entire periphery of the opened upper end is in close contact with the opening upper end; Holding means for detachably holding the powder receiving hopper in a state in which the powder receiving hopper is in close contact with the opening; powder suction / transport means including a suction / transport pipe connected to the negative pressure generating means; Pressure gas supply means including pressure gas supply pipe means for connecting between the positive pressure generation means and the reversing machine Gas flow path connecting means for detachably connecting the discharge port and the negative pressure generating means in a state in which the discharge port is connected to the middle of the flow path of the suction transport pipe, The discharge port is connected to the negative pressure generating means via the suction transport pipe by the gas flow path connecting means in a state where the drum is held by the powder receiving hopper and the reversing machine is inverted. The powder in the powder receiving hopper is discharged to the suction and transport pipe by the operation of the suction and transport means, and a pressurized gas is supplied into the powder receiving hopper by the operation of the pressurized gas supply means. Pressurize the inside of the body receiving hopper to inflate the bag,
A powder discharging device is provided.

In the above invention, the above-described method of discharging powder is embodied as an apparatus, and thus the same effects as described above are achieved. Further, since the device has a relatively simple mechanism, it can be easily put into practical use.

An automatic discharge valve for opening and closing the discharge port, an automatic suction valve for opening and closing an upstream side of a communication section with the discharge port in the suction transport pipe, and an automatic outlet for opening and closing a downstream side of the communication section; A valve, an automatic on-off valve for opening and closing the pressurized gas supply pipe means, a gas flow control valve for adjusting the gas flow rate of the pressurized gas supply pipe means, and a pressure detection means for detecting the pressure in the powder receiving hopper. A gas flow rate measuring means for measuring a gas flow rate of the pressure gas supply pipe means, the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, and the automatic opening / closing. Control means for controlling the operation of the valve and the gas flow control valve, the control means activating the positive pressure generating means, and opening the automatic suction valve and the automatic outlet valve to control the negative pressure generating means. After actuation, the powder receiver is opened by opening the automatic discharge valve. An operation control is performed to discharge the powder in the hopper to the suction transport pipe, and in parallel with the operation control, the automatic open / close valve is opened, and based on detection signals from the pressure detection means and the gas flow rate measurement means. It is preferable to control the opening of the gas flow control valve so that the pressure P1 in the powder receiving hopper becomes higher than the atmospheric pressure P by a predetermined pressure α. In this invention, the pressurized gas can be continuously supplied into the powder receiving hopper while discharging the powder in the powder receiving hopper, and the powder gas is stored in the bag while ensuring the powder discharging efficiency. The powder can be discharged substantially completely without any remaining amount. The present invention can be said to be suitable for discharging powder that is relatively easy to flow. In addition, since the discharge of the powder to the suction transport pipe and the supply of the pressurized gas into the powder receiving hopper are performed by the control means, the automatic operation can be easily performed.

An automatic discharge valve for opening and closing the discharge port, an automatic suction valve for opening and closing an upstream side of a communication section with the discharge port in the suction transport pipe, and an automatic outlet for opening and closing a downstream side of the communication section; A valve, an automatic open / close valve for opening and closing the pressure gas supply pipe means, and operating the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, and the automatic open / close valve Controlling means for controlling the positive pressure generating means, opening the automatic suction valve and the automatic outlet valve and operating the negative pressure generating means, and then controlling the automatic discharge valve. The operation control is performed such that the powder in the powder receiving hopper is discharged to the suction transport pipe by opening, and in parallel with the operation control, the automatic opening / closing valve is set to the opening operation duration set by the duration setting means. And open / close once based on the duration of closing operation Performing powder transport and bag inflation processing, and performing operation control to repeat the processing by the number of times n1 based on the number of repetitions n1 set by the number of repetitions setting means for setting the number of repetitions of the processing. Is preferred. In this invention, the pressurized gas can be intermittently supplied into the powder receiving hopper while discharging the powder in the powder receiving hopper, and the powder gas is stored in the bag while ensuring the powder discharging efficiency. The powder can be discharged substantially completely without any remaining amount. In particular, by intermittently supplying the pressurized gas into the powder receiving hopper, the powder adhering to the inner surface of the bag can be effectively separated, and the discharging of the powder in the bag can be performed more effectively. Is done. The present invention can be said to be suitable for discharging relatively hard-to-flow powder.
In addition, since the discharge of the powder to the suction transport pipe and the supply of the pressurized gas into the powder receiving hopper are performed by the control means, the automatic operation can be easily performed.

An automatic discharge valve for opening and closing the discharge port, an automatic suction valve for opening and closing an upstream side of a communication section with the discharge port in the suction transport pipe, and an automatic outlet for opening and closing a downstream side of the communication section; A valve, a suction transportation bypass pipe having one end connected to the upstream side of the automatic suction valve in the suction transportation pipe and the other end connected to the downstream side of the automatic exit valve, and an automatic bypass for opening and closing the suction transportation bypass pipe A valve, an automatic on-off valve for opening and closing the pressurized gas supply pipe means, the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, the automatic bypass valve, and the automatic bypass valve. Control means for controlling the operation of the automatic opening and closing valve, the control means actuate the positive pressure generating means,
After the automatic suction valve and the automatic outlet valve are opened to operate the negative pressure generating means, the automatic discharge valve is opened to discharge the powder in the powder receiving hopper to the suction transport pipe. After controlling, at least the bladder inflating process is performed. In the bladder inflating process, the automatic bypass valve is opened, the automatic suction valve and the automatic outlet valve are closed, and the automatic opening / closing valve is set by the duration setting means. Based on the open operation continuation time and the close operation continuation time, and based on the number of repetitions n2 set by the number of repetitions setting means for setting the number of repetitions of the opening and closing operations once. It is preferable that the opening / closing operation is performed by controlling the operation so as to be repeated n2 times. In the present invention, the pressurized gas is intermittently supplied into the powder receiving hopper, and when the pressurized gas is supplied, the inside of the powder receiving hopper is substantially sealed, so that the flushing effect on the bag is high, and In particular, the powder adhering to the inner surface of the bag can be more effectively peeled off, and the discharge of the powder in the bag can be performed more effectively. In addition, since the discharge of the powder to the suction transport pipe and the supply of the pressurized gas into the powder receiving hopper are performed by the control means, the automatic operation can be easily performed.

The powder receiving hopper includes a conical perforated plate inside the perforated plate, and an annular space substantially insulated from outside air is formed on the outer peripheral surface side of the perforated plate. Preferably, it is opened in the space. In the present invention, the pressurized gas is supplied to the space on the outer peripheral surface side of the perforated plate, is ejected inward through the perforated plate, and pressurizes the inside of the powder receiving hopper while passing through the powder. Of the powder, and the powder is smoothly and reliably discharged. Since the discharge of the powder to the suction transport pipe and the supply of the pressurized gas into the powder receiving hopper are performed by the control means,
Automatic driving can be easily performed.

According to the present invention, in order to attain the second technical object, the present invention further provides a support frame which can be turned 180 ° around a horizontal axis, a receiving opening at one end and a discharge opening at the other end. And a powder receiving hopper supported by the support frame so that the discharge opening is located on the upper side and the receiving opening is located on the lower side,
A reversing machine including a drum support opposing a space below the receiving opening and being vertically movable by the first lifting / lowering means; and A drum accommodated in such a manner that the entire periphery of the opened upper end is in close contact with the upper end of the opening, a powder suction / transport means including a suction / transport pipe connected to the negative pressure generating means, and the powder receiver. Pressure gas supply means including pressure gas supply pipe means for connecting between the inside of the hopper and the positive pressure generation means, and the discharge port is provided with an automatic discharge valve for opening and closing the discharge port, The suction transport pipe is disposed so as to extend horizontally below the drum support at an interval, and extends vertically upward from the suction transport pipe, and the upper end thereof is raised and lowered by a second lifting means. Flexible gas flow path connecting means is provided, and the drum is set on the drum support. The drum support is raised by the first lifting / lowering means in a state in which the upper end of the opening is held in close contact with the receiving opening. The powder in the bag is dropped into the powder receiving hopper, and the lower end of the powder passage connecting means is spaced apart and aligned above the upper end of the gas flow path connecting means. A powder discharge device is provided, wherein the upper end of the gas flow path connection means is lifted to be connected in close contact with the lower end of the discharge port.

In the above invention, the above-described method of discharging powder is embodied as an apparatus, and thus the same effects as described above are achieved. Only by setting the drum on the drum support and raising the drum support by the first lifting / lowering means, the upper end of the opening is held in close contact with the receiving opening of the powder receiving hopper. There is no burden. Also, by reversing the reversing machine,
The lower end of the discharge port is positioned above and spaced from the upper end of the connecting pipe means, and the powder in the bag is dropped into the powder receiving hopper. By raising the upper end of the means, it is connected in close contact with the lower end of the discharge port, so that there is no burden on the operator. Further, since the device has a relatively simple mechanism, it can be easily put into practical use.

The gas flow path connecting means includes a flexible pipe means having a lower end connected to the suction transport pipe and capable of extending and contracting in the vertical direction. The second elevating means includes a stationary frame and an upper end of the flexible pipe means. And the upper end of the flexible tube means defines the upper end of the gas flow path connecting means, and the flexible tube means is connected to the discharge port by the second elevating means. It is preferred that the working position connected to the lower end of the part and the non-working position in which the upper end of the flexible tube means retreats downward from the lower end of the outlet are selectively located. In the present invention, the connection between the discharge port after the reversal and the suction transport pipe can be automatically performed, and there is no burden on the operator.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a powder discharging device embodying a powder discharging method according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 4, reference numeral 200 denotes a roller conveyor, which is disposed so as to extend linearly. Roller conveyor 200
Can transport a fiber drum 40 to be described later along a pair of guides 202 disposed above the fiber drum 40. Another roller conveyor 204 is provided adjacent to the downstream end of the roller conveyor 200. Above the roller conveyor 204, a stopper 206 for stopping the fiber drum 40 conveyed by the roller conveyor 200 at a predetermined position is provided. Roller conveyor 2
Reference numeral 04 is provided on a turntable (not shown).
A powder discharging device 2 is provided on one side of the roller conveyor 204.

The powder discharging device 2 includes a stationary frame 4, a supporting frame 6 supported on the upper portion of the stationary frame 4 so as to be able to be inverted by 180 ° around a horizontal axis L, and a supporting frame 6. Powder receiving hopper 8 provided. The stationary frame 4 arranged on the floor has a rectangular parallelepiped shape entirely covered by a panel, and a support shaft 10 is rotatably supported around its horizontal axis L in the upper end thereof. A sprocket 12 is fixed to the support shaft 10, and the sprocket 12 is connected via an endless chain 14 to a drive source (not shown), for example, an electric motor. The support shaft 10 can be turned 180 ° by an electric motor. One end of the support shaft 10 is disposed so as to protrude outward from the side of the stationary frame 4,
The support frame 6 is fixed to the protruding end. The support frame 6 extends further horizontally from the projecting end of the support shaft 10 when viewed from the side, and has a yoke shape when viewed from above. A powder receiving hopper 8 is fixed and supported between support portions 16 which form the yoke shape of the support frame 6 and extend in parallel with each other at a horizontal interval.

The powder receiving hopper 8 includes a main body 18 having a substantially drum shape, and a cylindrical portion 20 connected to an open end of the main body 18. A conical perforated plate 22 for receiving powder is provided in the main body 18.
The perforated plate 22 has many small holes of 1 to 5 μm,
It can be suitably formed from synthetic resin, cloth, sintered metal and the like. Between the outer peripheral surface side of the perforated plate 22 and the main body 18,
An annular space 24 that is substantially isolated from outside air is formed. One end of the cylindrical portion 20 which is one end of the powder receiving hopper 8 (one end opposite to the main body 18) defines a powder receiving opening 26, and is the other end of the powder receiving hopper 8. The bottom side of the main body 18 (the bottom side opposite to the cylindrical section 20) defines a powder outlet 28. A discharge pipe 30 is fixed to the discharge port 28. The discharge pipe 30 forms a discharge port 30 for the powder. The discharge pipe 30 is provided with an automatic discharge valve E for opening and closing the discharge pipe 30. The automatic discharge valve E is composed of a pneumatic ball valve and is normally closed.

The powder receiving hopper 8 configured as described above
The non-transport position in which the discharge port 30 is located on the upper side and the receiving opening 26 is located on the lower side by rotating the support shaft 10 by the electric motor (the position shown in FIGS. 1 to 3).
And the transport position (the position shown in FIG. 4), which is inverted from the non-transport position and in which the discharge port 30 is located on the lower side and the receiving opening 26 is located on the upper side. The electric motor, sprocket 12, chain 14, support shaft 10
The support frame 6 constitutes a reversing machine M capable of reversing the powder receiving hopper 8 by 180 °.

When the powder receiving hopper 8 is positioned at the non-transport position, guide rails 32 extending vertically downward are provided on each of the support portions 16 of the support frame 6, and each of the guide rails 32 is provided. , A supporting member 34 is mounted so as to be vertically movable while being guided by them. Each of the support members 34 is an air cylinder 3 that constitutes a first elevating means.
6 are supported by the corresponding support portions 16. A drum support 37 is disposed at the lower end of each of the support members 34. The drum support 37 is disposed below the receiving opening 26 of the powder receiving hopper 8 so as to face the receiving opening 26 at an interval. At the upper end of the drum support 37, a roller conveyor 38 for transporting a fiber drum 40 described later is provided. Positioning means 39 for positioning the fiber drum 40 at a predetermined position is also provided at the lower end of each of the support members 34. The positioning means 39 can be composed of, for example, a pair of arc-shaped holding members that radially oppose the outer peripheral surface of the fiber drum 40 and an air cylinder that moves them radially (neither is shown). . The drum support 37 includes an air cylinder 36
As a result, the upper surface of the roller conveyor 38 coincides with the upper surface of the roller conveyor 204, and the upper surface of the roller conveyor 38 is raised from the above-described import position. The upper surface of the bag mounting jig 50 described later is
8 is selectively positioned at a drum holding position held in a state of being brought into close contact with the receiving opening 26. The guide rail 32, the support member 34, the air cylinder 36, the drum support 37, and the roller conveyor 38 constitute holding means for holding the fiber drum 40 in the powder receiving hopper 8 in a detachable manner.

Next, referring to FIG.
Will be described. In a fiber drum 40 having an opening upper end portion 42 (hereinafter simply referred to as drum 40),
A bag 44 containing powder, which is made of a synthetic resin such as polyvinyl chloride containing powder, is contained. The bag 44 is not limited to a synthetic resin, but may be, for example, a paper bag or the like having an inner surface laminated with an appropriate material. After removing the lid (not shown) from the upper end 42 of the opening,
The upper end of the bag 44 is opened. A ring-shaped bag attachment jig 46 is attached to the upper end 42 of the opening. Bag mounting jig 46
At the lower end, a press-fit portion 48 that is press-fitted from the upper end portion 42 of the opening of the drum 40 to the inner peripheral surface, and an annular lower surface that horizontally extends radially outward from the press-fit portion 48 are formed. Have an L-shaped step. The bag attaching jig 46 is mounted with the press-fitting portion 48 being press-fitted from the upper end 42 of the opening to the inner peripheral surface and the annular lower surface being in close contact with the upper surface of the upper end 42 of the opening. The opened upper end of the bag 44 is folded back so as to cover the upper surface of the bag mounting jig 46 including the L-shaped step,
The other bag mounting jig 50 is attached in close contact with the bag mounting jig 46. That is, the other bag mounting jig 50 has an L-shaped cross section that matches the L-shaped step of the bag mounting jig 46, and the upper end of the bag 44 is attached to the L-shaped cross section of the bag mounting jig 46. Is tightly sandwiched and press-fitted, so that the bag attaching jig 4
6 is firmly attached. The drum 40 is mounted in such a manner that the opened upper end is in close contact with the opening upper end 42 of the drum 40 as described above. The bag mounting jig 46 has a plurality of through holes 52 communicating the inner peripheral surface and the outer peripheral surface thereof.
Are formed. Thereby, the space between the outer peripheral surface of the bag 44 and the inner peripheral surface of the drum 40 in the drum 40 is communicated with the atmosphere.

Referring again to FIGS. 1 to 4, the drum 40 containing the bag 44 as described above is transported along the guide 202 by the roller conveyor 200, and is transported on the roller conveyor 204 at the downstream end thereof. The stopper 206 stops at the center. Next, the roller conveyor 204
Is rotated 90 ° by a turntable (not shown). The roller conveyor 38 of the powder discharging device 2 is positioned at the above-described drum loading position. The roller conveyor 204 and the roller conveyor 38 of the powder discharging device 2 are driven to rotate, and the drum 40 is driven by the roller conveyor 204.
From above to a roller conveyor 38 and stopped at a predetermined position. The drum 40 is positioned at a predetermined position by the positioning means 39. The drum support 37 is raised by the air cylinder 36 and positioned at the above-described drum holding position. As a result, the upper surface of the bag mounting jig 50 of the drum 40 is held in close contact with the receiving opening 26 of the powder receiving hopper 8. Next, the reversing machine M is rotated (reversed) by 180 ° from the non-transport position (the position shown in FIGS. 1 to 3) by the electric motor, and is positioned at the transport position (the position shown in FIG. 4). Drum 40
Is also inverted, and the powder in the bag 44 is dropped into the powder receiving hopper 8.

The powder discharging device 2 according to the present invention further comprises:
The first embodiment of the powder discharging device 2 including the powder suction / transporting means, the pressurized gas supply means, and the control means for controlling the operation thereof will be described. With reference to FIGS. 3, 4 and 6, the powder suction transport means will be described first. The suction transporting means includes a powder suction transporting pipe 60 disposed below the drum support 37 and extending horizontally at an interval. An introduction pipe 62 is provided on the suction transport pipe 60 so as to extend vertically upward from the suction transport pipe. A bellows tube 64 that is vertically expandable and contractible is connected to the upper end of the introduction tube 62. Bellows tube 6
A connection pipe 66 is connected to the upper end of 4 so as to extend vertically upward. A stationary frame 68 extending radially outward is provided on the introduction pipe 62, and an air cylinder constituting second elevating means is provided between the stationary frame 68 and the connection pipe 66 constituting the upper end of the flexible tube means. 70 are provided. When the reversing machine M is turned over and positioned at the transport position, the lower end of the discharge port 30, that is, the lower end of the discharge pipe 30 is connected to the connecting pipe 6
The positional relationship between the two is defined so as to be positioned above the upper end of 6 at a distance and in alignment. Connection pipe 6
6 is an air cylinder 70, the upper end of which is a discharge pipe 3
0 and the discharge pipe 30
And a non-operating position retracted downward from the lower end of the cover. The introduction pipe 62, the bellows pipe 64, the connection pipe 66, the stationary frame 68, and the air cylinder 70
The gas flow path connecting means extends vertically upward from 0 and the upper end can be moved up and down by the second elevating means. In addition, bellows tube 64
The connection pipe 66 constitutes a flexible pipe means, and the uppermost end of the flexible pipe means (the upper end of the connection pipe 66) defines the upper end of the gas flow path connection means.

The above-mentioned discharge port 28 in the suction transport pipe 60
An automatic suction valve A that opens and closes the upstream side is disposed upstream of the communication section with the (discharge pipe 30), that is, the T-shaped communication section in which the introduction pipe 62 is provided, and is provided downstream of the communication section. On the side, an automatic outlet valve B for opening and closing the downstream side is disposed, and further,
A manual flow control valve C is provided between the automatic suction valve A and the communication part. Reference numeral 72 denotes a bypass pipe, one end of which is provided in the automatic suction valve A in the suction transport pipe 60.
The other end is connected between the communication part and the automatic outlet valve B. The bypass pipe 72 is provided with a manual flow control valve D. An air filter 74 is provided at the upstream end of the suction transport pipe 60, and a bag filter 76 which is a dust collecting device for collecting powder is provided downstream of the automatic outlet valve B in the suction transport pipe 60, Downstream of the bag filter 76, a roots blower RB, which is a negative pressure generating means, is provided.

Next, with reference to FIGS. 1, 2 and 6, a description will be given of a pressurized gas supply means for supplying pressurized air as pressurized gas into the powder receiving hopper 8. FIG. The pressurized gas supply means includes a pressurized gas supply pipe 80 which is a pressurized gas supply pipe means. The pressure gas supply pipe 80 is an air filter 82, a compressor COM as a positive pressure generation means, and a gas flow rate measurement means for measuring the gas flow rate of the pressure gas supply pipe 80 from the upstream end to the downstream. A gas flow measurement sensor SF, a gas flow control valve K for adjusting the flow rate of gas in the pressure gas supply pipe 80, and an automatic opening / closing valve F for opening and closing the pressure gas supply pipe 80 are arranged in the above order.
0 is opened in the powder receiving hopper 8. In this embodiment, the downstream end of the pressure gas supply pipe 80 is opened in the space 24 in the powder receiving hopper 8. The powder receiving hopper 8 is provided with a pressure sensor SP as pressure detecting means for detecting the pressure in the powder receiving hopper 8. The automatic suction valve A, the automatic outlet valve B, and the automatic opening / closing valve F are constituted by pneumatic ball valves together with the automatic discharge valve E, and their operation is controlled by an electromagnetic opening / closing valve (not shown). As shown in FIGS. 1 and 2, the main body 18 of the powder receiving hopper 8 supports an annular tube 18a extending along the outer peripheral surface thereof via a suitable bracket. 3 in the circumferential direction of the pipe 18a
The location and the main body 18 are communicated via a connection pipe 18b. One end of the connection pipe 18 b forms a nozzle that opens into the main body 18. The automatic on-off valve F is connected to the connection pipe 18b.
Are arranged. The pipe 18a and the connection pipe 18b constitute a part of the pressure gas supply pipe 80. 1 in the circumferential direction of the pipe 18a
The location and a part of the pressurized gas supply pipe 80 disposed in the stationary frame 4 are connected via a flexible pipe 18c. Therefore, the 180 ° rotation of the reversing machine M can be easily absorbed by the flexible pipe 18c.

The powder discharging device 2 is provided with control means for controlling the transportation of powder and the supply of pressurized air. Referring to FIG. 7, this control means includes a control unit and an operation unit. The control unit is composed of a microcomputer, and has a central processing unit for performing arithmetic processing according to the control program, a ROM for storing the control program and a set time, a set pressure value in the powder receiving hopper 8, a pressure supplied to the powder receiving hopper 8. Storage means having a RAM for storing the flow rate of air and the like, and timers T0 (continuous open operation time of the automatic discharge valve E), T1 (continuous open operation time of the automatic on-off valve F), and T2 (Roots blower RB) for measuring the operation time. (A delay time until the automatic outlet valve B is closed after the drive is stopped), an input / output interface, and the like. The operation unit consists of an operation panel provided with various input keys such as a power switch, operation switches of the device, ten keys for directly inputting a set time, a set pressure value, etc., and a device operation command signal, a set time, and a set pressure value. And the like are sent to the control unit. The control unit configured as described above receives the input signal from the operation unit and the pressure sensor S
Based on the detected pressure signal from P, the detected flow rate signal from the gas flow rate measuring sensor SF, and the like, predetermined arithmetic processing is executed according to the control program, and the automatic discharge valve E, the automatic suction valve A,
Automatic outlet valve B, Roots blower RB, Compressor CO
A control signal is output to M, a gas flow control valve K, an automatic opening / closing valve F, and the like. The operation of the automatic suction valve A, the automatic outlet valve B, the automatic opening and closing valve F, and the automatic discharge valve E is controlled by outputting a control signal from the control unit to each of the electromagnetic opening and closing valves (not shown). For the purpose of the description, it is described that the control unit outputs a control signal to the automatic suction valve A, the automatic outlet valve B, the automatic opening / closing valve F, and the automatic discharge valve E.

Next, the outline of the operation procedure of transporting powder and supplying compressed air in the above-described powder discharging device 2 will be described with reference to the flowcharts shown in FIGS. explain. The following control is performed in a state where the reversing machine M is turned 180 degrees from the non-transport position and is positioned at the transport position, and the connecting pipe 66 is positioned at the operation position by the air cylinder 70. In addition,
As will be described later, the flow rate of air passing through the suction transport pipe 60 is adjusted in advance by the manual flow control valve C. The required amount of the flow control valve D is opened to allow a part of the air passing through the suction transport pipe 60 to flow to the bypass pipe 72, thereby adjusting the flow rate of the air passing through the suction transport pipe 60.

In order to start the operation of transporting the powder and supplying the pressurized air, first, the power switch of the operation unit is turned on.
To When the power switch is turned on, the control unit starts operation as shown in the flowcharts of FIGS. Here, the set time of each of the timers T0 to T3, the set pressure value, the flow rate of the pressurized air (predetermined flow rate), and the like are input using a ten key. The timer setting is performed in addition to this, but is omitted here for simplification of description. These set time, set pressure value, flow rate of the pressure air, etc.
Stored in AM. When the set time, the set pressure value, the flow rate of the pressure air, and the like of each of the timers T0 to T3 are input and the operation preparation is completed, the operation switch of the apparatus is turned on. The above steps are omitted in the flowcharts of FIGS. The automatic discharge valve E, the automatic suction valve A, the automatic outlet valve B, and the automatic opening / closing valve F are closed.

After the operation switch of the apparatus is turned on, in the first step S1, a control signal is output from the control unit to the compressor COM to operate the compressor COM, and pressurized air is supplied to the pressurized gas supply pipe 80. . Although not shown, a relief valve is provided in the pressure gas supply pipe 80 so as to prevent an excessive increase in pressure. Next, the control unit proceeds to step S2, outputs a control signal to the automatic suction valve A of the suction transport pipe 60, and opens the automatic suction valve A. In step S3, the control unit outputs a control signal to the automatic outlet valve B and opens the automatic outlet valve B. In step S4, the control unit outputs a control signal to the roots blower RB and drives the roots blower RB to rotate. The air, which is a gas, is sucked through the suction transport pipe 60 through the air filter 74, the automatic suction valve A, the manual flow control valve C, the automatic outlet valve B, and the bag filter 76. The controller proceeds to step S5, outputs a control signal to the automatic discharge valve E, and opens the automatic discharge valve E. As soon as the automatic discharge valve E is opened, the timer T0 starts counting time. When the automatic discharge valve E is opened, the powder dropped from the bag 44 into the powder receiving hopper 8 is suctioned and discharged to the suction transport pipe 60 through the discharge pipe 30, the connection pipe 66, the bellows pipe 64, and the introduction pipe 62. Then, the transportation of the powder is started. The powder sucked and discharged into the suction transport pipe 60 is collected in the bag filter 76. The set time of the timer T0 is set to an appropriate time when the suction and discharge of the powder in the powder receiving hopper 8 is started. In step S6, it is determined whether or not the timer T0 has reached a set time. The control unit waits if the set time has not been reached, and proceeds to step S7 if the set time has been reached.

In step S7, the control section outputs a control signal to the automatic opening / closing valve F to open the automatic opening / closing valve F. At the same time when the automatic opening / closing valve F is opened, the timer T1 starts counting time. When the automatic open / close valve F is opened, the compressed air supplied to the pressurized gas supply pipe 80 by the compressor COM is supplied into the powder receiving hopper 8 through the gas flow control valve K and the automatic open / close valve F. The pressurized air is supplied to a space 24 on the outer peripheral surface side of the perforated plate 22 in the powder receiving hopper 8,
2 and is ejected to the inside through the powder, and inside the powder receiving hopper 8 (and inside the bag 44 in the drum 40) while passing through the powder.
Is pressurized, the bag 44 is expanded toward the inside of the drum 40, and also promotes fluidization of the powder, so that the powder is smoothly and reliably discharged. The timer T1 detects the powder in the bag 44 and the powder receiving hopper 8 after the transportation of the powder is started.
The time is set to a time sufficient for the powder inside to be discharged substantially completely without any remaining amount, that is, the transport time of the powder. Next, the control unit proceeds to step S8. In step S8, the control unit determines whether the pressure P1 in the powder receiving hopper 8 is larger than a set pressure P + α higher than the atmospheric pressure P by a predetermined pressure α. This determination is made based on the detected pressure signal input from the pressure sensor SP that detects the pressure in the powder receiving hopper 8. The set pressure P + α is such that the pressure in the powder receiving hopper 8 does not become excessively high and the smooth discharge of the powder is not hindered.
4 is set to an appropriate pressure value such that the inside of the drum 40 expands at least to the extent that no wrinkles occur. When the bag 44 is wrinkled, the powder is left and the complete discharge is hindered.
If the pressure P1 in the powder receiving hopper 8 is not higher than the pressure P + α, the control unit proceeds to step S9, and if the pressure P1 in the powder receiving hopper 8 is higher than the pressure P + α, the control unit Proceed to step S14.

In step S9, the controller determines whether the pressure P1 in the powder receiving hopper 8 is smaller than the pressure P + α. This determination is also performed based on the detected pressure signal input from the pressure sensor SP. When the pressure P1 in the powder receiving hopper 8 is not smaller than the pressure P + α (that is, when the pressure P1 in the powder receiving hopper 8 is equal to the pressure P + α), the control unit returns to Step S8. On the other hand, in step S9, the pressure P1 in the powder receiving hopper 8
Is smaller than the pressure P + α, the control unit proceeds to step S10.

In step S10, the control unit outputs a control signal to the gas flow control valve K to control the gas flow control valve K to increase its opening. Thereby, the compressor COM
, The flow rate of air supplied into the powder receiving hopper 8 via the pressurized gas supply pipe 80 is increased. Next, the control unit proceeds to step S11. In step S11,
The controller determines that the pressure P1 in the powder receiving hopper 8 is a pressure P + α.
It is determined whether it is equal to or not. If the pressure P1 in the powder receiving hopper 8 is not equal to the pressure P + α, the control unit waits,
When the pressure P1 in the powder receiving hopper 8 becomes equal to the pressure P + α, the control unit proceeds to step S12.

In step S12, the control unit outputs a control signal to the gas flow rate control valve K to control so as to stop the operation of increasing the opening. In step S12, the control unit proceeds to step S13 in a state where the operation of increasing the opening degree of the gas flow rate control valve K is stopped and the opening degree at the time of the stop is maintained. In step S13, the control unit determines whether the timer T1 has reached a predetermined time.
When the timer T1 has not reached the predetermined time, the control unit returns to step S8, and when the timer T1 has reached the predetermined time, the control unit proceeds to step S17.

As described above, in step S8,
When the pressure P1 in the powder receiving hopper 8 is higher than the pressure P + α, the control unit proceeds to step S14. In step S14, the control unit outputs a control signal to the gas flow rate control valve K to control the opening degree of the gas flow rate control valve K to be reduced.
Thereby, the compressed gas supply pipe 8 from the compressor COM is
0, the flow rate of the air supplied into the powder receiving hopper 8 is reduced. Next, the control unit proceeds to step S15. In step S15, the control unit determines whether the pressure P1 in the powder receiving hopper 8 is equal to the pressure P + α. If the pressure P1 in the powder receiving hopper 8 is not equal to the pressure P + α, the control unit waits, and the pressure P1 in the powder receiving hopper 8 is
Is equal to the pressure P + α, the control unit proceeds to step S16.

In step S16, the control unit outputs a control signal to the gas flow rate control valve K to control the operation to stop the operation of reducing the opening degree. In step S16, the control section proceeds to step S13 in a state where the gas flow rate control valve K stops the operation of decreasing the opening and maintains the opening at the time of the stop. In step S13, the control unit determines whether the timer T1 has reached a predetermined time.
If the timer T1 has not reached the predetermined time, the control unit returns to step S8 and repeats the control. Timer T
When 1 has reached the predetermined time (that is, when the powder contained in the bag 44 and the powder that has fallen into the powder receiving hopper 8 are substantially completely discharged with no remaining amount), as described above. Proceed to step S17.

In step S17, the control section outputs a control signal to the automatic opening / closing valve F to close the automatic opening / closing valve F.
The control unit proceeds to step S18, outputs a control signal to the compressor COM, and stops driving of the compressor COM. Thus, the supply of the compressed air to the powder receiving hopper 8 is stopped. In step S19, the control unit outputs a control signal to the roots blower RB to stop driving the roots blower RB. At the same time, the timer T2 starts measuring time. When the driving of the roots blower RB is stopped, the suction action in the suction transport pipe 60 is stopped. The timer T2 is set to an appropriate time for returning the inside of the suction transport pipe 60 to the atmospheric pressure. In step S20, it is determined whether the timer T2 has reached a set time. If the set time has not been reached, the control unit waits, and if the set time has been reached, step S
Proceed to 21. In step S21, the control unit outputs a control signal to the automatic outlet valve B and closes the automatic outlet valve B. The control unit proceeds to step S22. In step S22, the control unit outputs a control signal to the automatic suction valve A and closes the automatic suction valve A. Next, the control unit proceeds to step S23, and in step S23, the control unit outputs a control signal to the automatic discharge valve E, closes the automatic discharge valve E, and ends the suction discharge and transport of the powder and the supply control of the pressure air. .

The above-described first embodiment of the powder discharging device 2 according to the present invention
By performing the above control, the embodiment of FIG.
The powder that has fallen into the powder receiving hopper 8 from the inside is sucked and discharged from the outlet 28 into the suction transport pipe 60 and transported. At the same time, the pressurized gas is continuously supplied into the powder receiving hopper 8, so that the bag 44 is prevented from expanding and falling into the powder receiving hopper 8. Therefore, according to the above-described apparatus 2, the powder contained in the bag 44 and the powder in the powder receiving hopper 8 can be substantially completely discharged with no remaining amount while ensuring the powder discharging efficiency. .

When the discharge and transportation of the powder are completed as described above, the connecting pipe 66 is retracted to the non-operation position by the air cylinder 70, and then the reversing machine M is rotated by 180 ° from the transportation position. Returned to the non-transport position. The drum support 37 is lowered by the air cylinder 36, and the upper surface of the roller conveyor 38 is positioned at the drum loading position that coincides with the upper surface of the roller conveyor 204. As a result, the drum 40 is separated downward from the powder receiving hopper 8, and the holding of the drum 40 is released. After releasing the clamping action of the drum 40 by the positioning means 39, the roller conveyor 38 and the roller conveyor 20 are released.
4 is rotated in the direction opposite to the direction of loading, the drum 40 is moved from the roller conveyor 38 onto the roller conveyor 204, and the roller conveyor 204 is
Rotate it back to its original position. Next, the drum 40 is manually removed from the roller conveyor 204. Thus, the operation of discharging the powder in one bag 44 is completed.

Next, a second embodiment of the powder discharging device 2 will be described with reference to FIGS. FIG.
In FIG. 11 and FIG. 11, the same parts as those of the apparatus shown in FIGS. The device shown in FIG. 10 is different from the device shown in FIG. 6 in that the gas flow measuring sensor SF and the gas flow control valve K shown in FIG. Instead, the manual flow control valve G is provided, the pressure sensor SP is not provided, and the pressure air supply control described later is performed. The flow rate of air passing through the pressure gas supply pipe 80 is adjusted in advance by a manual flow rate control valve G. The control unit (not shown) includes a counter for counting a set number n1 of the number of repetitions N of the powder transport and bag inflation processing described later, a timer T1 for measuring the open operation duration of the automatic on-off valve F, and a closing operation duration. Timer T2 to measure time
Is provided. The set number n1 is input to the control unit by a numeric keypad of the operation unit, which is a repetition number setting unit. The set times of the timer T1 and the timer T2 are input to the control unit by the ten-key of the operation unit, which is a duration setting unit.

After the operation switch of the apparatus is turned on, the control unit sequentially performs the control from the first step S1 to step S6.
The content of the control up to is substantially the same as the control from step S1 to step S6 shown in FIG. After performing the control up to Step S6, the control unit
Proceed to step S7. In step S7, the control unit starts counting the preset number of repetitions n1 of the powder transport and bag inflation processing. The powder transport and bag expansion processing is performed in steps S8 to S12. The control unit proceeds from step S7 to step S8. In step S8, the control unit outputs a control signal to the automatic opening / closing valve F, and opens the automatic opening / closing valve F. At the same time when the automatic opening / closing valve F is opened, the timer T1 starts counting time. Automatic on-off valve F
Is opened, the pressurized air supplied to the pressurized gas supply pipe 80 by the compressor COM is supplied into the powder receiving hopper 8 through the manual flow control valve G and the automatic opening / closing valve F. The timer T1 is set to an appropriate time to bring the bag 44 into the inflated state. In step S9, it is determined whether the timer T1 has reached a set time. The control unit waits if the set time has not been reached, and proceeds to step S10 if the set time has been reached.

In step S10, the control unit outputs a control signal to the automatic opening / closing valve F and closes the automatic opening / closing valve F. At the same time as the automatic on-off valve F is closed, the timer T2 starts counting time. The timer T2 is set to at least an appropriate time during which the bag 44 does not fall into the powder receiving hopper 8 and hinder the discharge of the powder. In step S11, it is determined whether or not the timer T2 has reached a set time. The control unit waits if the set time has not been reached, and proceeds to step S12 if the set time has been reached. In step S12, the control unit determines whether or not the number of repetitions N of the powder transport and bag inflation processing has reached a set number of times n1. Number N is set number n1
If not, the control unit returns to step S8,
The control from step S8 to step S11 is repeated. When the number N reaches the set number n1, it means that the powder in the bag 44 and the powder in the powder receiving hopper 8 have been substantially completely sucked and discharged, and the control unit proceeds to step S13. The control unit performs the control from step S13 to step S18 and ends. The contents of the control from step S13 to step S18 are performed in step S18 shown in FIG.
Since the control from step to step S23 is substantially the same, the description is omitted.

The second embodiment of the powder discharging device 2 according to the present invention
By performing the above control, the embodiment of FIG.
The powder that has fallen into the powder receiving hopper 8 from the inside is sucked and discharged from the outlet 28 into the suction transport pipe 60 and transported. At the same time, the pressurized gas is intermittently supplied into the powder receiving hopper 8, so that the bag 44 is prevented from intermittently expanding and falling into the powder receiving hopper 8. Note that 2 in FIG.
The dashed line indicates the state where the bag 44 has fallen, and according to the present invention, such a state of the bag 44 can be avoided. In particular, when the pressurized gas is intermittently supplied into the powder receiving hopper 8, the powder adhering to the inner surface of the bag 44 can be effectively peeled off (since a flushing effect is obtained).
The discharge of the powder in the bag 44 is performed more effectively. Therefore, according to the above-described apparatus 2, the powder contained in the bag 44 and the powder receiving hopper 8 are secured while ensuring the powder discharging efficiency.
The powder inside can be substantially completely discharged without any remaining amount. The intermittent supply of compressed air in the above apparatus is performed by time control, but may be performed by pulse control instead.

Next, a third embodiment of the powder discharging device 2 will be described with reference to FIGS. 12, the same components as those of the apparatus shown in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted. The device shown in FIG. 12 differs from the device shown in FIG. 10 in that the suction transport pipe 60 is provided with the suction transport bypass pipe 90 and the control mode. One end of the suction transport bypass pipe 90 is connected to the suction transport pipe 60.
Is connected between the automatic suction valve A and the air filter 74, and the other end is connected between the automatic outlet valve B and the bag filter 76 in the suction transport pipe 60. The suction transport bypass pipe 90 is provided with an automatic bypass valve H for opening and closing the suction transport bypass pipe 90. The automatic bypass valve H is also constituted by a pneumatic ball valve and is normally closed. The control unit (not shown) includes a counter that counts a set number n2 of the number of repetitions N of the bag inflating process described later, a timer T3 that measures the opening operation duration of the automatic opening / closing valve F in the bag inflating process, and an automatic outlet valve B. T4 for measuring the open operation continuation time of the automatic bypass valve H
A timer T5 or the like is provided for measuring a delay time from when the is closed until the process proceeds to the next step S. The set number n2 is input to the control unit by a numeric keypad of the operation unit, which is a repetition number setting unit. The set time of the timers T3 to T5 is input to the control unit by the ten-key of the operation unit, which is a duration setting unit.

After the operation switch of the apparatus is turned on, the control unit sequentially performs the control from the first step S1 to step S12.
The content of the control up to 12 is substantially the same as the control from step S1 to step S12 shown in FIG. After performing the control up to Step S12, the control unit proceeds to Step S13. In step S13, the control unit starts counting the preset number of repetitions n2 of the bag inflation process. The bag inflation process is performed in steps S14 to S25. The control unit proceeds from step S13 to step S14. In step S14, the control unit outputs a control signal to the automatic bypass valve H and opens the automatic bypass valve H. In step S15, the control unit outputs a control signal to the automatic suction valve A and closes the automatic suction valve A. In step S16, the control unit outputs a control signal to the automatic outlet valve B and closes the automatic outlet valve B. The air sucked from the air filter 74 bypasses the automatic suction valve A and the automatic outlet valve B, and is sucked toward the bag filter 76 through the suction transport bypass pipe 90. When the automatic suction valve A and the automatic outlet valve B are closed, the inside of the powder receiving hopper 8 (and the bag 44 in the drum 40) is closed.
Inside) is substantially sealed.

The control section proceeds to step S17. In step S17, the control unit outputs a control signal to the automatic opening / closing valve F, and opens the automatic opening / closing valve F. Pressure air is supplied into the powder receiving hopper 8, and the bag 44 is inflated. At the same time as the automatic opening / closing valve F is opened, the timer T3 starts counting time. The timer T3 is set to at least an appropriate time during which the bag 44 does not fall into the powder receiving hopper 8 and hinder the discharge of the powder. In step S18, it is determined whether or not the timer T3 has reached a set time. The control unit waits if the set time has not been reached, and proceeds to step S19 if the set time has been reached. In step S19, the control unit outputs a control signal to the automatic opening / closing valve F and closes the automatic opening / closing valve F. In step S20, the control unit outputs a control signal to the automatic outlet valve B and opens the automatic outlet valve B. The sealed state in the powder receiving hopper 8 is released. At the same time, the timer T4 starts measuring time. In step S21, it is determined whether the timer T4 has reached a set time. The controller waits if the set time has not been reached, and proceeds to step S22 if the set time has been reached.

In step S22, the control section outputs a control signal to the automatic suction valve A, and opens the automatic suction valve A. Thereby, the suction transport pipe 60 is communicated. The control unit proceeds to step S23. In step S23, the control unit outputs a control signal to the automatic bypass valve H, and closes the automatic bypass valve H. At the same time, the timer T5 starts counting time.
The suction transport of the powder from inside the powder receiving hopper 8 is started. The set time of the timer T5 defines the suction transportation time of the powder. In step S24, it is determined whether or not the timer T5 has reached a set time. If the set time has not been reached, the control unit waits, and if the set time has been reached, step S2
Go to 5. In step S25, the control unit determines whether the number of repetitions N of the bag inflation process has reached the set number of times n2. If the number N has not reached the set number n2, the control unit returns to step S14 and returns to step S14.
Is repeated from step S25 to step S25. If the number N has reached the set number n2, the control unit proceeds to step S26.
Proceed to.

In step S26, the control unit performs the second powder transport and bag inflation process (the processes in steps S7 to S12). In step S27,
The control unit performs the second bag inflation process (the processes in steps S13 to S25). In step S28, the control unit performs the third powder transport and bag inflating process. In step S29, the control unit performs the third bag inflation process. At this point, the remaining amount of the powder in the bag 44 is very small, and the bag inflating process is performed while the inside of the powder receiving hopper 8 is substantially sealed, so that a high flushing effect can be obtained. After performing the third bag inflation process, the control unit performs the control from step S30 to step S35 and ends. Step S30
The contents of the control from step S35 to step S35 are substantially the same as the control from step S13 to step S18 shown in FIG.

The third embodiment of the powder discharging device 2 according to the present invention
In the embodiment of the present invention, the powder transport and the bag inflation process and the bag inflation process are alternately repeated, and the supply of the pressurized air into the powder receiving hopper 8 is intermittently supplied. The effect of the suction transport and the expansion effect of the bag can be obtained. In particular, when the bag inflating process is performed, the inside of the powder receiving hopper 8 is substantially sealed, so that the flushing effect on the bag 44 is high, and therefore, the powder adhering particularly to the inner surface of the bag 44 can be more effectively removed. The discharge of the powder in the bag 44 is performed more effectively. Further, since the formation of the above-mentioned sealed state in the powder receiving hopper 8 is performed by closing the automatic outlet valve B and the automatic suction valve A, the powder transport and the bag expanding process which are started after performing the bag expanding process. Performed smoothly and reliably. The intermittent supply of compressed air in the above apparatus is performed by time control, but may be performed by pulse control instead. There is also a method of closing the automatic discharge valve E, instead of closing the automatic suction valve A and the automatic outlet valve B of the suction transport pipe 60 as described above, to make the inside of the powder receiving hopper 8 substantially sealed. obtain.

The embodiment of discharging powder embodying the method of discharging powder according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment and departs from the scope of the present invention. Various changes or modifications can be made without any change. For example, in the above embodiment, when the reversing machine M is reversed and positioned at the transport position, a gas flow path connection for connecting the discharge port 28 of the powder receiving hopper 8 to the roots blower RB of the suction transport pipe 60 is provided. As shown in FIGS. 3 and 4, the means includes an introduction pipe 62, a bellows pipe 64, and a connection pipe 6.
6, the stationary frame 68, the air cylinder 70, and the like, but there are other embodiments. That is, the portion of the suction transport tube 60 shown in FIG. 4, that is, from the air filter 74 to the downstream side of the automatic outlet valve B (the portion shown by the solid line in FIG. 4) is integrated with the discharge tube 30. There is also a configuration in which the suction transport pipe 60 is fixed and a part of the suction transport pipe 60 is mounted on the reversing machine M side. In this embodiment, the introduction pipe 62, the bellows pipe 64, the connection pipe 66, the stationary frame 68, the air cylinder 70 and the like are not used, and the discharge pipe 30 of the powder receiving hopper 8 is not used.
Is extended downward to be connected directly and integrally to the suction transport pipe 60. Therefore, the above-mentioned unit portion of the suction transport pipe 60 is reversed and moved together with the reversing machine M. In a state where the suction transport pipe 60 is horizontally positioned at the position shown in FIG. 4 by reversing the reversing machine M, the suction transport pipe 60 is disposed at the downstream end of the unit part and at the downstream side of the unit part. The suction transport pipe 60 (see the two-dot chain line in FIG. 4) may be detachably connected to the upstream end via gas flow path connection means (not shown). As an example of the gas flow path connecting means, the bellows tube and the air cylinder as described above can be used. That is, the bellows tube is expanded and contracted in the axial direction of the suction / transport tube 60 by the air cylinder, and the same gas flow path connecting means as described above is easily configured. The gas flow path connecting means in the present invention also includes the configuration as described above.

[0054]

According to the method and apparatus for discharging powder according to the present invention, the powder contained in the bag can be discharged substantially completely without any remaining amount. As a result, waste of the powder is eliminated, and the powder can be effectively used to the maximum.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of a reversing machine portion of a powder discharging device constituted according to the present invention, together with a part of a powder transport line.

FIG. 2 is a schematic side view of FIG. 1 as viewed from below.

FIG. 3 is a view of the inverted portion of the powder discharging device shown in FIG. 1 as viewed from the direction of the rotation axis, and is a diagram showing a part of the suction transport pipe.

FIG. 4 is another operation mode diagram of FIG. 4;

FIG. 5 is a schematic cross-sectional view showing a state in which a bag containing powder whose upper end is opened is accommodated in a drum.

FIG. 6 is a configuration diagram schematically showing a first embodiment of the overall configuration of a powder discharge device configured according to the present invention.

FIG. 7 is a schematic diagram showing a control-related configuration included in the powder discharging device shown in FIG. 6;

8 is a flowchart showing a part of an operation procedure by the powder discharging device shown in FIG.

FIG. 9 is a flowchart showing a part of an operation procedure by the powder discharging device shown in FIG. 6;

FIG. 10 is a configuration diagram schematically showing a second embodiment of the overall configuration of a powder discharge device configured according to the present invention.

11 is a flowchart showing a part of the operation procedure by the powder discharging device shown in FIG.

FIG. 12 is a configuration diagram schematically showing a third embodiment of the overall configuration of the powder discharge device configured according to the present invention.

13 is a flowchart showing a part of an operation procedure by the powder discharging device shown in FIG.

FIG. 14 is a flowchart showing a part of an operation procedure by the powder discharging device shown in FIG. 12;

FIG. 15 is a flowchart showing a part of the operation procedure by the powder discharging device shown in FIG. 12;

[Explanation of symbols]

 Reference Signs List 2 powder discharging device 8 powder receiving hopper 26 receiving opening 28 discharge opening 30 discharge pipe 36 air cylinder 40 fiber drum 44 bag 60 suction transport pipe 64 bellows pipe 70 air cylinder 80 pressure gas supply pipe 90 suction transport bypass pipe RB Roots blower A Automatic suction valve B Automatic outlet valve E Automatic discharge valve F Automatic on-off valve H Automatic bypass valve COM Compressor

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hirokazu Moroboshi 3-19 Ohara, Hiratsuka-shi, Kanagawa Prefecture Tokuju Kosakusho Co., Ltd.

Claims (10)

[Claims] 1. An entire periphery of an upper end portion of an opened powder bag accommodated in a drum having an upper end portion of an opening is brought into close contact with the upper end portion of the opening, and a receiving opening portion is discharged at one end and discharged at the other end. The receiving opening of the powder receiving hopper, which has an outlet and the discharge opening is on the upper side and the receiving opening is located on the lower side,
After closely holding the upper end of the opening of the drum, the powder receiving hopper is inverted together with the drum so that the discharge port is located on the lower side and the receiving opening is located on the upper side. The powder in the powder receiving hopper is discharged by dropping the powder into the powder receiving hopper and then communicating the discharge port with the negative pressure generating means of the powder suction and transport means. The body receiving hopper communicates with the positive pressure generating means of the pressurized gas supply means to supply pressure gas into the powder receiving hopper and pressurize the powder receiving hopper, thereby inflating the bag. To discharge powder. 2. The method according to claim 1, wherein the discharge port communicates with the negative pressure generating means of the suction transport means to discharge the powder in the powder receiving hopper while continuously supplying a pressurized gas into the powder receiving hopper. 2. The method for discharging powder according to claim 1, wherein the powder is supplied intermittently or intermittently. 3. The powder according to claim 1, wherein the pressurized gas is intermittently supplied into the powder receiving hopper, and when the pressurized gas is supplied, the inside of the powder receiving hopper is substantially sealed. How to discharge the body. 4. A powder receiving hopper having a receiving opening at one end and a discharging opening at the other end is disposed such that the discharging opening is located on the upper side and the receiving opening is located on the lower side. And a reversing machine capable of reversing the powder receiving hopper such that the discharge port is on the lower side and the receiving opening is on the upper side, and the upper end of the opening is open and the powder bag is opened. A drum accommodated in a state in which the entire periphery of the upper end portion is in close contact with the upper end portion of the opening, and the drum is detachable from the powder receiving hopper with the upper end portion of the opening in close contact with the receiving opening. Holding means for holding, suction and transportation means for powder including a suction and transportation pipe connected to the negative pressure generation means, and pressure gas supply pipe means for connecting between the inside of the powder receiving hopper and the positive pressure generation means. Pressure gas supply means including the discharge port and the negative pressure generation means in a state where the reversing machine is reversed. A gas flow path connecting means for removably connecting the discharge port part to the middle of the flow path of the suction / transport pipe, and holding the drum in the powder receiving hopper, The discharge port is connected to the negative pressure generating means via the suction / transport pipe by the gas flow path connection means in a state where the powder is inverted, and the powder in the powder receiving hopper is operated by the suction / transport means. Is discharged into the suction transport pipe, and a pressurized gas is supplied into the powder receiving hopper by operating the pressure gas supplying means to pressurize the inside of the powder receiving hopper, thereby inflating the bag.
A powder discharge device characterized by the above-mentioned. 5. An automatic discharge valve that opens and closes the discharge port, an automatic suction valve that opens and closes an upstream side of a communication section with the discharge port in the suction transport pipe, and opens and closes a downstream side of the communication section. An automatic outlet valve, an automatic on-off valve for opening and closing the pressurized gas supply pipe means, a gas flow control valve for adjusting the flow rate of gas in the pressurized gas supply pipe means, and a pressure detection for detecting the pressure in the powder receiving hopper Means, a gas flow rate measuring means for measuring a gas flow rate of the pressure gas supply pipe means, the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, Control means for controlling the operation of the automatic opening / closing valve and the gas flow control valve, wherein the control means operates the positive pressure generating means, and opens the automatic suction valve and the automatic outlet valve to generate the negative pressure. After activating the means, the powder is opened by opening the automatic discharge valve. Operation control so as to discharge the powder in the suction hopper to the suction transport pipe, and in parallel with the operation control, the automatic opening / closing valve is opened, and based on detection signals from the pressure detection means and the gas flow rate measurement means. The operation of controlling the opening of the gas flow rate control valve so that the pressure P1 in the powder receiving hopper becomes higher than the atmospheric pressure P by a predetermined pressure α. Discharge device. 6. An automatic discharge valve that opens and closes the discharge port, an automatic suction valve that opens and closes an upstream side of a communication section with the discharge port in the suction transport pipe, and opens and closes a downstream side of the communication section. An automatic outlet valve, an automatic open / close valve for opening and closing the pressure gas supply pipe means, the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, and the automatic open / close valve Control means for operating the positive pressure generating means, opening the automatic suction valve and the automatic outlet valve to operate the negative pressure generating means, and then performing the automatic discharge. Opening the valve controls the operation of discharging the powder in the powder receiving hopper to the suction transport pipe. In parallel with the operation control, the automatic opening / closing valve is set to the opening operation set by the duration setting means. It is designed to open and close once based on the duration time and the closing operation duration time. To control,
The operation control is performed such that the powder transport and bag inflation processing are performed, and the processing is repeated by the number of times n1 based on the number of repetitions n1 set by the number of repetitions setting means for setting the number of times the processing is repeated. Powder discharging device. 7. An automatic discharge valve that opens and closes the discharge port, an automatic suction valve that opens and closes an upstream side of a communication section with the discharge port in the suction transport pipe, and opens and closes a downstream side of the communication section. An automatic outlet valve, a suction transport bypass pipe having one end connected to the upstream side of the automatic suction valve in the suction transport pipe and the other end connected to a downstream side of the automatic outlet valve, and opening and closing the suction transport bypass pipe; An automatic bypass valve, an automatic open / close valve for opening and closing the pressure gas supply pipe means, the negative pressure generating means, the positive pressure generating means, the automatic discharge valve, the automatic suction valve, the automatic outlet valve, and the automatic bypass valve And control means for controlling the operation of the automatic opening and closing valve, wherein the control means operates the positive pressure generating means, opens the automatic suction valve and the automatic outlet valve, and operates the negative pressure generating means. Then, by opening the automatic discharge valve, the powder After controlling the operation so that the powder is discharged to the suction transport pipe, at least a bag inflation process is performed.The bag inflation process opens the automatic bypass valve, closes the automatic suction valve and the automatic outlet valve, A repetition number setting that controls the automatic opening and closing valve to open and close once each based on the opening operation duration and the closing operation duration set by the duration setting means, and sets the number of repetitions of the one opening and closing operation. 5. The powder discharging apparatus according to claim 4, wherein the opening and closing operation is performed by repeating the operation based on the number of repetitions n2 set by the means. 8. The powder receiving hopper includes a conical perforated plate therein, and an annular space substantially insulated from outside air is formed on the outer peripheral surface side of the perforated plate. 8. The powder discharging device according to claim 4, wherein the means is opened in the space. 9. A support frame which can be turned 180 ° around a horizontal axis, has a receiving opening at one end and a discharge opening at the other end, and has the discharging opening on the upper side and the receiving opening on the lower side. A powder receiving hopper supported by the support frame so as to be positioned on the side, and a drum support opposing the receiving opening with a space therebetween and being vertically movable by first lifting / lowering means. A reversing machine, a drum having an opening upper end, and a powder-containing bag, which is housed in a state where the entire periphery of the opened upper end is in close contact with the opening upper end, and connected to the negative pressure generating means; And a pressure gas supply means including a pressure gas supply pipe means for connecting between the inside of the powder receiving hopper and the positive pressure generating means, and the discharge port portion. Is provided with an automatic discharge valve for opening and closing the discharge port, and the suction transport pipe is provided below the drum support. The suction transport pipe is provided with a gas flow path connecting means which extends vertically upward from the suction transport pipe and whose upper end can be raised and lowered by a second lifting means. By raising the drum support by the first elevating means with the drum set on the drum support, the upper end of the opening is held in close contact with the receiving opening, and the drum is held tightly. By inverting the reversing machine, the lower end of the discharge port is positioned above and in alignment with the upper end of the gas flow path connecting means, and the powder in the bag is placed in the powder receiving hopper. Discharging the powder, wherein the second raising / lowering means raises the upper end of the gas flow path connecting means so as to be in close contact with the lower end of the discharge port, and discharge the powder. apparatus. 10. The gas flow path connecting means includes a flexible pipe means having a lower end connected to a suction transport pipe and capable of extending and contracting in a vertical direction. The second elevating means includes a stationary frame and a flexible pipe means. An upper end of the flexible tube means defines the upper end of the gas flow path connection means, and the flexible tube means has an upper end formed by the second elevating means. 10. The operative position connected to the lower end of the outlet, and the non-operating position in which the upper end of the flexible tube means retracts downward from the lower end of the outlet. Powder discharging device.