JP3196091U - Suction air transport device with gas pressure detection device - Google Patents

Abstract

Provided is a suction air transport device in which an operator on the side of using a granular material can check the preparation status of pneumatic transportation of the granular material even when the granular material storage tank is in another room. . SOLUTION: A powder storage tank 1 that has an inlet and an outlet, stores the powder and then sends the powder through the opening / closing device, and the powder sent from the switching device is powdered. The transport pipe 6 for transporting to the granule receiving hopper 13 and the hopper are connected by a conduit 17, and a suction air source 18 for creating a gas flow from the storage tank toward the hopper, and the absence of powder in the hopper A suction control device 21 that detects the switch 22 to activate the suction device, a gas pressure detection device 10 that captures a pressure change in the vicinity of the outside air inlet 8 formed in the vicinity of the storage tank of the transport pipe, and a gas pressure detection device And an open / close control device 11 for controlling the open / close device of the storage tank based on the detection signal. When the time from when the level switch detects the empty signal of the granular material until the full signal is output exceeds the set time, the suction control device outputs an alarm output. [Selection] Figure 1

Description

The present invention detects a pressure fluctuation due to a gas flow as a signal, and sends a gas pressure detection device that sends the detection signal to a device that requires the detection signal, and using this gas pressure detection device, a granular material of a synthetic resin material, etc. The present invention relates to a granular material transport device transported by a gas flow.

Conventionally, as this kind of granular material transport device and a gas pressure detection device used therefor, those described in Patent Document 1 are known. What was described in this patent document 1 is demonstrated based on FIG.

In FIG. 3, the granular material transport device includes two granular material storage tanks 101 and 101 in which the granular material is stored as a synthetic resin molding material, and an opening and closing device 105 below the granular material storage tanks 101 and 101. , 105 connected to the end of the transport pipe 114, the collector 131 connected to the end of the transport pipe 114 to separate the gas and the granular material, and the internal pressure of the transport pipe 114 through the collector 131 By making the negative pressure, a gas flow of air is generated in the transport pipe 114, and the powder stored in the powder storage tanks 101, 101 is transported by a gas flow to the collector 131 through the transport pipe 114. The suction device 139 is a main component.

The opening / closing device 105 connected to the lower part of the granular material storage tank 101 is in response to a detection signal of the pressure detection means 112 that detects pressure fluctuation in the transport pipe provided on the start end side of the transport pipe 114. The signal line 111A is connected to a first controller 110 that controls opening and closing of the opening and closing device 105. The opening / closing device 105 is operated by an operating device 109 such as a motor, and the operating device 109 is connected to a first control device 110 having a microcomputer by a signal line 111A.

As described above, the powder storage tank and the collector are connected with the pressure change of the transport pipe as a signal, and the present invention has been able to omit the control by the conventional electric signal line.

JP 2000-153922 A

However, an operator on the side using the granular material may not be able to confirm whether the granular material is ready for pneumatic transportation when the storage tank for the granular material is in another room.

For this reason, the granular material has an inlet and an outlet, stores the granular material, and sends the granular material from the outlet via the opening / closing device, and the powder sent from the opening / closing device A transport pipe for transporting the particles to the particle receiving hopper and the particle receiving hopper are connected by a conduit, and suction air that creates a gas flow from the particle storage tank toward the particle receiving hopper A source, a suction control device that activates the suction device by detecting that there is no powder in the powder receiving hopper with a level switch, and formed near the powder storage tank in the transport pipe A granular material provided with a gas pressure detecting device that detects a pressure change near the outside air inlet, and an opening / closing control device that controls the opening / closing device of the granular material storage tank based on a detection signal of the gas pressure detecting device Suction air transport device of the level Invented the suction air transport device with the suction control device with a terminal to output an alarm when the time from when the switch detects the empty signal of the granular material until the full signal is issued exceeds the set time .

According to this, when the time from when the level switch provided in the granular material receiving hopper detects the empty signal of the granular material until the full signal is output exceeds the set time, it becomes a device that outputs an alarm. Therefore, even if there is no more material up to the level meter of the granular material receiving hopper, it is detected that the material storage tank is not ready for material supply before there is no material in the transport destination such as a molding machine. And you can make preparations before the material runs out.

It is a schematic block diagram of the granular material transport apparatus using the gas pressure detection apparatus which shows the actual form of this invention. It is a time chart figure in embodiment of this invention. It is a schematic block diagram of the granular material transport apparatus using the conventional gas pressure detection means.

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram when a resin is transported to a molding machine. FIG. 2 shows a timing chart of each component unit of the embodiment.

At least one granular material storage tank 1 is installed, and these granular material storage tanks 1 have an inlet 2 in the upper part and an outlet 3 in the lower part.
A known opening / closing device 4 such as a rotary vane feeder is connected to the outlet 3 of the granular material storage tank 1, and the outlet 3 is connected to an inlet 7 of the transport pipe 6 through a branch pipe 5. The transport pipe 6 has an outside air inlet 8 formed on the left side of the transport pipe inlet 7 in FIG. 1 and serves as an air inlet for transporting suction air, so that foreign matter is not mixed into the pipe by the filter 9. It has become.

A gas pressure detection device 10 is connected to the right side of the transport pipe inlet 7, and is detected when the inside of the transport pipe 6 is in a set negative pressure state, and is connected to the open / close control device 11 via a signal line. When the open / close control device 11 receives the negative pressure signal, the open / close control device 11 issues an operation signal / stop signal to the open / close device 4 according to a preset operation pattern. When the negative pressure signal disappears, the open / close control device 11 issues a stop signal. .
The operation pattern is as follows, for example.
(1) The opening / closing device 4 is opened for a set time and then closed.
(2) The opening of the opening / closing device 4 is repeated for a relatively short time, for example, for 2 seconds, and then for example, for 1 second, is closed while the negative pressure state continues.

The outlet of the transport pipe 6 is connected to the inlet 12 of the granular material receiving hopper 13. The granular material receiving hopper 13 has a discharge pipe 14 in the lower part and a gas outlet 15 and the input pipe 12 in the upper part. In the receiving hopper, there is provided a perforated plate 16 that delimits the inlet 12 and the gas outlet 15 and does not allow passage of powder and does not allow passage of gas. With such a configuration, the granular material that has entered the granular material receiving hopper 13 from the inlet 12 is blocked by the perforated plate 16 and does not exit from the gas outlet 15. At the gas outlet 15 of the granular material receiving hopper 13, a negative pressure is generated in the transport pipe 14 via the conduit 17, and a gas flow from the granular material storage tank 1 toward the granular material receiving hopper 13 is created in the transport pipe 6. A suction port 19 of a suction air source 18 is connected via a dust collector 20, and the suction air source 18 exhausts to the atmosphere. The suction air source 18 is connected to a suction control panel 21 having a microcomputer / sequencer or the like via a signal line.

The discharge pipe 14 of the granular material receiving hopper 13 is formed of a transparent cylinder, and the lower end of the discharge pipe 14 is connected to the molding material inlet 31 of the injection molding machine 30. A capacitance type level switch 22 is installed in the discharge pipe 14 to detect that the granular material receiving hopper 13 is empty. The level switch 22 is connected to the suction control device 21. With such a configuration, when there is no more granular material up to the position of the level switch 22 of the discharge pipe 14, the level switch 22 detects that fact and sends a detection signal to the suction control device 21. Further, the material can be stored under the level switch 22 of the discharge pipe 14 so that the material can be continuously formed even if the material is transported two or more times.

When receiving the detection signal from the gas pressure detection device 10, the opening / closing control panel 11 operates the opening / closing device 4 and opens it at a predetermined short time interval as many times as set / stored (including zero). As a result, the opening / closing device 4 can be indirectly controlled by the opening / closing control panel 11 which is far away and not connected by the signal line.

The operation of each component will be described with reference to the timing chart of FIG. The timing chart of FIG. 2 is indicated as ON when each device is operating, and OFF when it is stopped, and is positioned so that it is at the top when ON and at the bottom when OFF. The horizontal axis shows the elapsed time. First, the normal state shown in step 1 will be described. When the level switch 22 issues a material request signal (ON), the timer counts simultaneously. Next, the suction air source 18 is activated (ON), and the suction air passes through the transport pipe 6 to indicate that the gas pressure detection device 10 is in a decompressed state (ON).

When the gas pressure detection device 10 detects decompression (ON), the open / close device 4 alternately switches between an open state (ON) and a closed state (OFF) in which the material is supplied, and the material supply is repeated intermittently. The number of repetitions is repeated in advance, or while the gas pressure detection device 10 is ON. During this time, the granular material is transported from the granular material storage tank 1 to the granular material receiving hopper 13 through the transport pipe 6, and the level switch 22 stops the empty signal of the material (OFF). Then, after the timer is full, when the timer expires and then turns off, the normal material transport stops, and the switch 4 and the suction air until the level switch 22 issues a request signal (ON). The source 18 is stopped.

Next, step 2 will be described. When the level switch issues a material request signal (ON), the timer indicates the count at the same time. Next, the suction air source 18 is activated (ON), the suction air indicates that the gas pressure detection device 10 is in a decompressed state through the transport pipe 6, and the gas pressure detection device 10 is turned on. When the gas pressure detection device 10 detects a reduced pressure (ON), the switching device 4 is switched and repeated with a time period in which the material has an open state where the material falls and an OFF state where the material stops. During this time, the particulate material is transported from the particulate storage tank 1 to the particulate receiving hopper 13 through the transport pipe 6, and when the set time is over, the suction air source 18 is stopped and the gas pressure detecting device 10 is decompressed. Shows atmospheric state OFF from state ON. Even when the timer expires and turns off, the level switch 22 does not stop the request signal, but the alarm output of the suction control panel 21 that is in the ON state is turned on, and a buzzer or lamp 23 notifies.

Conventionally, in the present method for controlling the cutting of the material by the pressure signal, the material preparation chamber 32 having the material storage tank 1 and the molding chamber 33 having the granular material receiving hopper are separated from each other by a wall 34 or the like. The person in charge of the molding chamber 33 that consumes the material cannot know the presence or absence of the material in the material storage tank 1 from the level detector by the electric signal that has been performed in the past, and therefore grasps the material preparation status. I was worried because I couldn't. For this reason, in this state, the material is not transported no matter how long it is waited for, and it can be avoided that the molding machine 30 causes the material shortage and stops, causing the problem that the material shortage becomes clear. Even if the state of the material preparation chamber 32 cannot be grasped from 33, the person in charge of the molding chamber 33 is informed by the alarm lamp 23 that the material in the granular material storage tank 1 has been lost, and the molding machine 30 continues to perform molding. In doing so, it becomes possible to deal with before the operation is stopped due to running out of material.

The gas pressure detection device of the granular material transport device according to the present invention and the granular material transport device using the same are the materials before the molding person runs out of material and stops the molding machine. It is possible to confirm in advance that the cut has occurred and take pre-response.

DESCRIPTION OF SYMBOLS 1 Granule storage tank 4 Opening and closing device 6 Transport pipe 8 Outside air inlet 10 Gas pressure detection device 11 Opening and closing control device 13 Granule receiving hopper 17 Conduit 18 Suction air source 21 Suction control device 22 Level switch

Claims (1)

A granular material storage tank for storing a granular material having an inlet and an outlet, storing the granular material, and sending the granular material from the outlet via an opening / closing device, and a granular material sent from the opening / closing device A transport pipe for transporting to a granular material receiving hopper, and the granular material receiving hopper are connected by a conduit, and a suction air source that creates a gas flow from the granular material storage tank toward the granular material receiving hopper, A suction control device that activates the suction device by detecting the absence of powder particles in the powder particle receiving hopper with a level switch, and an outside air introduction formed in the vicinity of the powder particle storage tank in the transport pipe Suction air for a granular material comprising a gas pressure detecting device for detecting a pressure change in the vicinity of the mouth, and an opening / closing control device for controlling the opening / closing device of the granular material storage tank based on a detection signal of the gas pressure detecting device A transport device, wherein the level switch is When the time from the detection of the empty delivery No. of granules until issues a full signal has passed over the set time, the suction air transport device with the suction control device having terminals for alarm output.

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