JP2002144345A - Apparatus for feeding granular material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for feeding a granular material without requiring connecting by a control line between a valve-opening and shutting device of a hopper for feeding the material and a transportation control board. SOLUTION: Since a pressure switch 17 for perceiving a pressure in a material transporting pipe 23 and a timer 19 are fitted to the valve-opening and shutting device 15 for functioning the opening and shutting valve 12 of a storing hopper 10 for storing a granular material once, a timer 19 is set so that the opening and shutting valve 12 shuts when a pressure in the material transporting pipe 23 is reduced, the pressure switch 17 is functioned to open the opening and shutting valve 12, and simultaneously a required amount of the granular material is sent out. Then, it is not required to connect an opening between the valve-opening and shutting device and the transportation control board by the control line, and a control program of the transportation control board can be also simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying granular materials such as resin pellets.

[0002]

2. Description of the Related Art FIG. 2 is a schematic diagram of a conventional resin pellet supply apparatus. In FIG. 2, a storage hopper 10 temporarily stores a granular material supplied from a material supply source such as a material tank (not shown), a hopper dryer, and a mixer. At the lower end of the storage hopper 10, a delivery port 14 having an on-off valve 12 is provided, and a desired amount of granular material is cut out by opening and closing the on-off valve 12 by a valve opening and closing device 15.

The supply hopper 16 has an upper surface sealed by a cap 18 serving as a decompression chamber, and is separated from the cap 18 by a filter 20. This supply hopper 16
The injection molding machine 22 is connected to a material input port (not shown), an injection cylinder, or the like, and supplies an amount of granular material necessary for several injections. Further, the supply hopper 16 and the storage hopper 10 are connected via the on-off valve 12 to the material transport pipe 23.
Connected by

[0004] The material transporting device 24 comprises a dust collecting box 28 having a cylindrical filter 26 built therein, a suction blower 30, and a transport control panel 32. The dust collection box 28 includes the supply hopper 1
6 is connected to the suction pipe 34 and the suction blower 30 and the filter 2 built in the dust collection box 28.
6 is connected by an exhaust pipe 36. The transport control panel 32 is connected to a valve opening / closing device 15 attached to the storage hopper 10 by a control line 38, and the opening / closing signal from the transport control panel 32 activates the valve opening / closing device 15 to open and close the on-off valve 12. You.

The operation of this conventional granular material supply apparatus will be described. When a signal to start suction is sent from the transport control panel 32 to the suction blower 30, the suction blower 30 starts suction and simultaneously via the control line 38. The opening signal of the on / off valve 12 is sent to the valve opening / closing device 15 to open the on / off valve 12.

When the suction blower 30 operates, the exhaust pipe 36
Thereby, the air in the dust collection box 28 is sucked. The cap 18 for sealing the dust collection box 28 and the supply hopper 16 is
4, the air in the supply hopper 16 is sucked into the dust collection box 28.

The supply hopper 16 and the open / close valve 12 of the storage hopper 10 are connected by a material transport pipe 23, and the air in the storage hopper 10 flows through the material transport pipe 23 from the open / close valve 12 and enters the supply hopper 16. Inflow. Due to this air flow, the granular material in the storage hopper 10 is transported to the supply hopper 16 by the material transport pipe 24.

When a desired amount of the granular material is discharged from the opening / closing valve 12 of the storage hopper 10, a signal for closing the opening / closing valve 12 is sent from the transport control panel 32 to the valve opening / closing device 15 via the control line 38. With this signal, the valve opening / closing device 15 is operated, the opening / closing valve 12 is closed, and the supply of the granular material from the storage hopper 10 is stopped.

When the on-off valve of the storage hopper 10 is closed, the particulate material finally discharged from the storage hopper 10 still remains in the material transport pipe 23. for that reason,
The suction blower 30 further continues to rotate, and when all the particulate material remaining in the material transport pipe 23 is sent into the supply popper 16, the suction blower 30 is stopped by a stop signal from the transport control panel 32.

[0010]

As described above, in the conventional apparatus for supplying resin pellets and the like, the opening and closing valve 12 of the storage hopper 10 is opened and closed by the transport control panel 32. Must be connected by the control line 38, and the control program of the transport control panel 32 must be complicated.

The present invention solves the above-mentioned problems relating to a conventional apparatus for supplying a granular material such as plastic pellets, in which a control line 38 is connected between a valve opening / closing apparatus 15 and a transport control panel 32. It is an object of the present invention to provide an apparatus for supplying a granular material such as a plastic pellet, which does not need to be used and can simplify the control program of the transport control panel 32.

[0012]

According to a first aspect of the present invention, there is provided a granular material supply apparatus having a granular material delivery port (14) at a lower end for temporarily storing the granular material fed from a material tank or the like. A storage hopper (10) for delivering granular material from the delivery port (14) via an on-off valve (12), and an injection molding machine (22)
A supply hopper (16) connected to the supply hopper for supplying an amount of the granular material required for injection, and a material transport pipe (23) for transporting the particulate material delivered from the on-off valve (12) to the supply hopper (16). , The supply hopper (16) and the suction pipe (3).
4) a material for sucking the particulate material in the storage hopper (10) by sucking the air in the supply hopper (16) and the material transport pipe (23) through the suction pipe (34). It is characterized by comprising a transport device (24) and a valve opening / closing device (15) that detects the pressure in the material transport pipe (23) and opens and closes the open / close valve (12) after a predetermined time.

[0013]

When a signal to start suction is sent from the transport control panel 32 to the suction blower 30, the suction blower 30 starts suction.
The supply hopper 16 and the open / close valve 12 of the storage hopper 10 are connected by a material transport pipe 23, and the air in the material transport pipe 23 is reduced in pressure by the operation of the suction blower 30. The valve opening / closing device 15 detects the pressure fluctuation in the material transport pipe 23 and opens and closes the open / close valve 12 after a predetermined time. Therefore, the valve open / close device 15 detects that the air in the material transport pipe 23 has been reduced in pressure, and
When the time for discharging the desired amount of the particulate material elapses, the on-off valve 12 is closed.

When the on-off valve 12 of the storage hopper 10 is closed, the granular material finally discharged from the storage hopper 10 still remains in the material transport pipe 23, but the granular material remaining in the material transport pipe 23 If the time during which all the material is fed into the supply popper 16 is set in the transport control panel 32 in advance, the suction blower 30 continues to rotate further, and the particulate material remaining in the material transport pipe 23 is completely removed from the supply popper 16. At this point, the suction blower 30 is stopped by a stop signal from the transport control panel 32.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the granular material supply device of the present invention. In FIG. 1, a storage hopper 1
Numeral 0 temporarily stores the granular material supplied from a material supply source such as a material tank (not shown), a hopper dryer, and a mixer. At the lower end of the storage hopper 10, a delivery port 14 having an on-off valve 12 is provided. The on-off valve 12 is opened and closed by a valve opening and closing device 15 to cut out a desired amount of granular material. Further, the valve opening / closing device 15 is connected to the material transport pipe 2.
A pressure switch 17 for sensing the pressure in the timer 3 and a timer 1
When the pressure in the material transport pipe 23 is reduced, the pressure switch 17 is operated, and at the same time, the timer 19 is set.

The supply hopper 16 has an upper surface hermetically sealed by a cap 18 serving as a decompression chamber, and is separated from the cap 18 by a filter 20. This supply hopper 16
The injection molding machine 22 is connected to a material input port (not shown), an injection cylinder, or the like, and supplies an amount of granular material necessary for several injections. Further, the supply hopper 16 and the storage hopper 10 are connected via the on-off valve 12 to the material transport pipe 23.
Connected by

The material transporting device 24 comprises a dust collecting box 28 having a cylindrical filter 26 built therein, a suction blower 30, and a transport control panel 32. The dust collection box 28 includes the supply hopper 1
6 is connected to the suction pipe 34 and the suction blower 30 and the filter 2 built in the dust collection box 28.
6 is connected by an exhaust pipe 36.

The operation of the above-described particulate material supply apparatus of the present invention will be described. When a signal to start suction is sent from the transport control panel 32 to the suction blower 30, the suction blower 30 starts suction. The program of the transport control panel 32 is as follows.
After the desired amount of the granular material is sent out from the storage hopper 10 and the on-off valve 12 is closed, the suction blower 30 is stopped so that the suction blower 30 is stopped when all of the granular material remaining in the material transport pipe 23 is sent into the supply popper 16. Is set.

When the suction blower 30 operates, the exhaust pipe 36
Thereby, the air in the dust collection box 28 is sucked. The cap 18 for sealing the dust collection box 28 and the supply hopper 16 is
4, the air in the supply hopper 16 is sucked into the dust collection box 28.

The supply hopper 16 and the open / close valve 12 of the storage hopper 10 are connected by a material transport pipe 23, and the air in the material transport pipe 23 is depressurized by the operation of the suction blower 30, so that the pressure switch 17 is turned on. Actuating, the on-off valve 12 is opened, and at the same time, the timer 19 is set. The air in the storage hopper 10 is supplied from the on-off valve 12 to the material transport pipe 23.
It flows inside and flows into the supply hopper 16. Due to this air flow, the granular material in the storage hopper 10 is transported to the supply hopper 16 by the material transport pipe 24.

When a desired amount of the granular material is delivered from the opening / closing valve 12 of the storage hopper 10, the timer 19 of the valve opening / closing device 15 is operated, the opening / closing valve 12 is closed, and the storage hopper 10 is closed.
The supply of the particulate material from is stopped.

When the open / close valve of the storage hopper 10 is closed, the particulate material finally discharged from the storage hopper 10 still remains in the material transport pipe 23. The suction blower 30 is further set to continue rotating further, and the suction blower 30 is stopped in advance when all the particulate material remaining in the material transport pipe 23 is fed into the supply popper 16.
The stop signal from the transport control panel 32 causes the suction blower 30
Stops.

[0023]

According to the present invention, there is provided a granular material supply device comprising: a valve opening / closing device for operating an opening / closing valve of a storage hopper for temporarily storing granular material;
Since the timer is attached, when the pressure in the material transport pipe is reduced, the pressure switch is operated to open the on-off valve, and at the same time, the timer is set so that the on-off valve is closed when a desired amount of the granular material is delivered. Therefore, there is no need to connect a control line between the valve opening / closing device and the transport control panel, and the control program for the transport control panel can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a granular material supply device of the present invention.

FIG. 2 is a schematic configuration diagram of a conventionally used resin pellet supply device.

[Explanation of symbols]

 10. Storage hopper 12 On-off valve 14 Outlet port 15 Valve opening / closing device 16 Supply hopper 17 Pressure switch 18 ······ Cap 19 ······ Timer 20 ····· Filter for supply hopper 22 ····· Injection molding machine 23 ························· 26 Reservoir filter 28 Dust box 30 Suction blower 32 Transport control plate 34 Suction pipe 36 Exhaust Pipe 38 ... Control line

Claims (1)

[Claims] 1. A granular material delivery port (14) is provided at a lower end, the granular material fed from a material tank or the like is temporarily stored, and the particulate material is delivered from the delivery port (14) via an on-off valve (12). A storage hopper (10), a supply hopper (16) connected to an injection molding machine (22) for supplying an amount of particulate material required for injection, and a supply hopper for supplying the particulate material sent from the on-off valve (12). Material transport pipe (2) for transport to hopper (16)
3) and the supply hopper (16) is a suction pipe (34).
A material transport device that sucks the particulate material in the storage hopper (10) by sucking the air in the supply hopper (16) and the material transport pipe (23) through the suction pipe (34). (24) and a valve opening / closing device (15) for sensing the pressure in the material transport pipe (23) and opening and closing the opening / closing valve (12) after a predetermined time.