JPS5925782Y2 - Blow tank type pneumatic transport device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a blow tank type pneumatic transport device that can continuously transport powder and increase transport efficiency.

Traditionally, blow tank type pneumatic transport devices for transporting powder have been divided into two types: one is a flux type that sends out powder from the middle part of the powder receiving tank, and the other is a flux type that sends out powder from the bottom of the powder receiving tank. However, conventional pneumatic transport equipment operates in batches, and the air in the tank is removed through the transport piping after each batch, so the efficiency of the transport piping is limited to an equivalent pipe length of about 300 m. In the case of cement transportation, it is 80 to 8.
5%, and in the case of limestone powder transportation, it was as low as 70 to 80%, and the longer the transportation distance, the further the transportation efficiency decreased.

That is, in the conventional blow tank type pneumatic transport device with a cellar set, as shown in FIG. 1, separate on-off valves 2. 2
a.3. An air supply pipe 5 connected to a compressed air source 4 via 3a. 5a, 6. 6a, and the powder delivery pipes 7, 7a of both the first tank and the second tank 1a are crossed in the middle via a switching valve 8, and then connected to the silo 10 with one powder transport pipe 9. Ta.

11 and 113 are on-off valves for receiving powder provided at the powder receiving ports 12 and 12a at the top of the first tank 1 and second tank 1a, respectively; 14. 14a is an air exhaust pipe connected to the dust collector 15, and 16, 161 is an on-off valve provided in the middle of the air exhaust pipe 14.14H.

In the device shown in FIG. 1, first, the on-off valve 11 opens and the first tank 1 starts receiving powder. When the first tank 1 is full, the level meter 13 operates and the on-off valve 11 is closed. .

Next, the switching valve 8 is switched to connect the powder delivery pipe 7 to the powder transport pipe 9, open the on-off valves 2 and 3, and start transporting the powder to the silo 10.

During transportation from the first tank 1, the second tank 1a closes the on-off valve 11a.
is opened and the reception of the powder is completed in the same manner as in the case of the first tank 1.

When the transportation from the first tank 1 is completed, the pressure in the first tank 1 starts to decrease, and the on-off valves 2 and 3 are closed at 0.5 to 0.6 kg/cm2G.

Next, the switching valve 8 is switched, the powder delivery pipe 7a is communicated with the powder transport pipe 9, the on-off valves 2a and 3a are opened, and the second tank 1
Start transportation from a.

Thereafter, in the same manner as the transportation from the first tank 1, the two tanks 1 and 1a alternately repeat receiving and pumping the powder.

Conventionally, it was done this way, so one tank 1 or 1
Unless all the powder sent out from tank a was completely sent into the silo 10, the powder from the other tank 1a or tank 1 could not be transported.

In addition, it took time to make the switch.

In that case, the pressure inside the tank and the transport capacity changed over time as shown in Figure 2.

In Fig. 2, T is the elapsed time, Pl is the pressure in the first tank 1, P2 is the pressure in the second tank 1a, tl is the time for pumping the powder from the first tank 1, and t2 is the second tank 1a. t3 is the switching time, t4 is the pressure drop time, Q is the powder transport capacity, Ql is the calculation capacity, and Q2 is the guarantee capacity.

Furthermore, the dotted line indicates the state at the time of receiving the powder.

In this way, in the conventional device, as can be seen from the diagram showing the change in tank pressure over time shown in Figure 2,
Continuous transportation is not possible, and the efficiency of transportation piping is quite poor.
It was not suitable for long distance transportation.

This idea is intended to eliminate these drawbacks, and 2.
Before switching the powder delivery from the tank, increase the pressure in the other tanks in advance, and install a circuit with an on-off valve to prepare for powder transport, so that continuous transport is possible. This increases transport efficiency to nearly 100% and allows the tank to be made smaller.

Next, this invention will be explained with reference to embodiments shown in the drawings.

In the blow tank type pneumatic conveyance device with a cellar set showing an embodiment of this invention shown in FIG. On-off valves 2, 2a.

Air supply pipe 5 connected to compressed air source 4 via 3.3a
．． 5a, 6. 6a, and each air supply pipe 6 connects each side of the first tank 1 and the second tank 1a to the compressed air source 4.
, 6a, other on-off valves 17 and 17a were attached in parallel to the on-off valves 3 and 3a.

That is, the side of the first tank 1 and the compressed air source 4 and the side of the second tank 1a and the compressed air source 4 are connected separately, and an on-off valve 3 for powder delivery is connected in the middle. , 3a, each air supply pipe 6, 6a has an on-off valve 1.
Separate branch air supply pipes with 7.171 in each case were provided in parallel.

This on-off valve 17.17a is used to increase the pressure in the first tank 1 and the second tank 1a, respectively, before starting powder transportation from the first tank 1 and the second tank 1a. This was provided in order to prepare for powder delivery and improve transportation efficiency, and includes powder delivery on-off valves 2. 5a, 6. 6a has a large capacity, whereas the on-off valves 17 and 171 and the air supply pipes which are branch pipes before and after the valves have a relatively small capacity.

The powder delivery pipes 7, 7a of both the first tank 1 and the second tank 1a were crossed in the middle and then connected to the silo 10 with one powder export pipe 9, but the powder delivery pipes 7, 7a were Separate on-off valves 1 are provided between the intersecting portion and the first tank 1 and the second tank 1a.
8.18 a was installed.

11.11 a is a powder receiving opening/closing valve provided in the powder receiving port 12.12a at the top of the first tank 1 and second tank 1a, respectively; , 1a, 14.14a is an air exhaust pipe connected to the dust collector 15, and 16.16a is an on-off valve provided in the middle of the air exhaust pipe 14.141.

Between the compressed air source 4 and the vicinity of the starting end of the powder transport pipe 9,
An air supply pipe 20 having an on-off valve 19 is provided to further improve efficiency.

In this device, the on-off valve 11 first opens to start receiving powder into the first tank 1, and when the first tank 1 is full, the level meter 1
3 works and closes the on-off valve 11.

After confirming that the on-off valve 11 is closed, the on-off valve 17 is opened and the pressure inside the first tank 1 is raised to the set pressure.

When the pressure inside the first tank 1 rises to a predetermined set pressure, the on-off valve 17 is closed based on the operation of a pressure switch (not shown), and the transportation preparation is completed.

During initial transportation, the on-off valve 18. Open 2.3 and
The transportation of powder from the first tank 1 is started.

At this time, in the second tank 1a, the on-off valve 11a is opened to start receiving powder, and when the second tank 1a is full, the level meter 13a is activated.
Close the on-off valve 11a.

After confirming that the on-off valve 11a is closed, the on-off valve 17a is opened, compressed air is filled in the second tank 1a up to the set pressure, and the on-off valve 17a is closed.

When the transportation of the powder in the first tank 1 is completed, the pressure in the first tank 1 starts to decrease.

At this time, the on-off valve 2゜3 is closed, and at the same time the on-off valves 18a and 2
a and 3a are opened to start transporting the powder from the second tank 1a.

In the first tank 1, after the powder transportation is completed, the on-off valve 16 is opened, the air inside the tank 1 is removed, and the pressure inside the tank 1 is O, Ikg/(7).
- When the temperature drops to about G, the on-off valve 11 opens and starts accepting new powder.

Thereafter, the first tank 1 and the second tank 1a repeat receiving and transporting powder in the same manner, and the changes in tank internal pressure and transport capacity as shown in FIG. 4 are repeated.

When the transportation of the powder from one tank 1 or 1a is finished, the switch is immediately made to the other tank 1a or 1, and the air in one tank 1 or 1a is switched to the on-off valve 16 or 16.
By discharging it into the atmosphere through a and the dust collector 15,
Inside the powder transport pipe 9, a constant amount of powder can be transported almost continuously.

In FIG. 4, T is the elapsed time, Pl is the pressure in the first tank 1, P2 is the pressure in the second tank 1a, tl is the time for pumping the powder from the first tank 1, and t2 is the second tank 1a. Q is the powder transportation capacity, and Q3 is the calculation ability and guarantee ability.

Furthermore, the dotted line indicates the state at the time of receiving the powder.

When modifying an existing blow tank type pneumatic transport device for a cellar set, do so as shown in Figure 5.

In this case, since the switching valve 8 is of a conventional type, pressure equalization piping and auxiliary pressure feeding piping are required.

Therefore, the on-off valves 3, 3a of the air supply pipes 6, 6a connecting each side of the first tank 1 and the second tank 1a to the compressed air source 4
In the section, another on-off valve 17.17a is installed in parallel with this valve 3, 3a.
At the same time, in the part where the switching valve 8 is located, the powder delivery pipes 7, 7a and the powder transport pipe 9 are connected in a bypass manner through pipes 21, 21a having on-off valves 18, 181. .

Additionally, an on-off valve 1 is provided between the compressed air source 4 and the powder transport pipe 9.
An air supply pipe 20 with 9 was installed.

In the apparatus shown in FIG. 5, the on-off valve 11 is first opened to start receiving powder into the first tank 1, and when the first tank 1 is full, the level meter 13 is activated and the on-off valve 11 is closed.

After confirming that the on-off valve 11 is closed, the on-off valve 17 is opened, compressed air is sealed in the first tank 1 to a set pressure, and the on-off valve 17 is closed.

Next, the switching valve 8 is operated to connect the powder delivery pipe 7 and the powder transport pipe 9, and the on-off valves 2 and 3 are opened to start transporting the powder.

At this time, in the second tank 1a, the on-off valve 11a is opened to start receiving the powder, and when the tank is full, the level meter 131 is activated and the on-off valve 11a is closed.

After confirming that on-off valve 11 a is closed, open on-off valve 17
Open the valve 17a, fill the second tank 1a with compressed air up to the set pressure, and close the on-off valve 17a.

When the transportation of the powder in the first tank 1 is completed, the pressure in the tank 1 starts to decrease.

At this time, open the on-off valve 19.18°18a, and open the on-off valve 2.
, 3 are closed, the switching valve 8 is switched to the side where the powder delivery pipe 7a communicates with the powder transport pipe 9, and after confirming the switching, the on-off valves 2a and 3a are opened, and the on-off valves 19, 18, and 18 a are closed. Closed, but transportation continues.

In the first tank 1, after the transportation is completed, the on-off valve 16 opens, the air inside the tank 1 is removed, and when the temperature drops to about 0.1 kg/cm"G, the on-off valve 11 opens and starts receiving the powder. .

Hereinafter, the first tank 1 and the second tank 1a will receive powder in the same manner.
Repeat transportation.

In addition, as an example of the blow tank type pneumatic transport device of this invention, only the one with a cella set has been described, but this can be similarly used with a fluxo type, or a combination of a cella set and a fluxo type. It can also be used for things.

In this way, in this invention, as described in the claims for utility model registration, this valve is installed in the on-off valve part of each air supply pipe that connects each side of the first tank and the second tank with the compressed air source. Other on-off valves were installed in parallel with the on-off valve, and separate on-off valves were installed between the intersection of both powder delivery pipes and the first tank and the second tank, so that the first tank and the second tank Before switching the powder delivery from the tank, by increasing the pressure in the tank in advance and preparing to send the powder, the maximum capacity can be continuously demonstrated at the same time as the switching. .

Therefore, the transport efficiency can be improved, continuous transport can be carried out, and as a result, the powder can be pneumatically transported over a sufficiently long distance using a relatively small tank.

In addition, with this idea, a small capacity on-off valve is installed in parallel with a large-capacity on-off valve, and only the small-capacity on-off valve is opened before the powder is sent out to increase the pressure inside the tank. The pressure inside the tank does not rise too much until the pressure reaches the specified pressure and closes the on-off valve, and as a result, the powder newly sent out from the powder delivery pipe is Powder can be delivered smoothly and continuously without backflow to the other powder delivery pipe, which will not clog that pipe or reduce its capacity.

In addition, in this invention, since the on-off valves installed in parallel have a small capacity, when one of the air transport pipes is transporting air and sending out powder, the on-off valves of the other inspection with a small capacity are used. Even if it is opened, the capacity of the air transport pipe that is currently sending air will hardly decrease, allowing smooth powder delivery.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an example of a conventional device similar to this invention, Fig. 2 is a diagram showing the pressure inside the tank, etc. in the device of Fig. 1, and Fig. 3 is an example of an embodiment of this invention. Circuit diagram shown, 4th
The figure is a diagram showing the pressure inside the tank in the device shown in Figure 2, and the diagram shown in Figure 5.
The figure is a circuit diagram showing another embodiment of this invention. 1...First tank, 1a...Second tank, 2.
2a, 3゜3 a, 11.11 a, 16.17
．． 17a, 18.18a, 19...Opening/closing valve, 5.5a, 6.6a, 20...Air supply pipe, 7.7a...Powder delivery pipe , 8...
...Switching valve, 9...Powder export pipe, 10...
...Silo, 12, 12a... Material receiving port.

Claims (1)

[Scope of utility model registration request] An air supply pipe connected to a compressed air source via a separate on-off valve for powder delivery is installed at the bottom and each side of each of the first and second tanks. In a blow tank type pneumatic transport device in which both powder delivery pipes intersect in the middle and are connected to a silo with a single powder transport pipe,
For each air supply pipe that separately connects the side of the first tank and the compressed air source, and the side of the second tank and the compressed air source, and has an on-off valve for sending out the powder in the middle. In order to increase the pressure in the first tank and the second tank in advance before sending out the powder, separate air supply pipes each having an on-off valve with a smaller capacity than the above-mentioned air supply pipes and on-off valves are provided. A separate on-off valve is provided for each powder transport pipe provided in parallel and between the first tank and the second tank and the intersection of the powder delivery pipes of both the first tank and the second tank. Installed blow tank type pneumatic transport device.