JPH10265042A - Transmission in pneumatic feed equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transmission in pneumatic equipment which can conduct prompt acceleration to a stable speed and shorten required time for pneumatic feed at the initial pneumatic feed start. SOLUTION: This pneumatic feed equipment, which is equipped with a pneumatic feed pipe 1 installed in an area ranging from a transmitter 2 to a receiver 3, and an exhauster 9 connected to the pneumatic feed pipe 1, and feeds a pneumatic feed piece 12 made to enter the pneumatic feed pipe 1 from the transmitter 2 to the receiver 3 by the force of air flow generated in the pneumatic feed pipe 1, starts the exhauster 9 at the time of conveyance start, starts the exhauster 9 at the time of starting conveyance, starts conveyance of the pneumatic feed piece 12 after the pressure in the pneumatic feed pipe 1 is decompressed, and accelerates the pneumatic feed piece 12 by the air flow which enters the pneumatic feed pipe 1 powerfully this time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission method capable of shortening the time required for pneumatic transport in a pneumatic facility for transporting an article using an air flow.

[0002]

2. Description of the Related Art As equipment for transferring objects, a pipe (pneumatic pipe) is provided between a position for sending an object (transmission position) and a position for receiving an object (reception position), and air is blown into the pipe by an exhaust fan. 2. Description of the Related Art Pneumatic equipment (air transport equipment) for generating a flow and transferring an object to be transferred (pneumatic element) from a transmitting position to a receiving position by the force of an air flow is known. Such equipment may be used to transport objects between facility buildings, such as between a sample collection building and its analysis building.

In the conventional pneumatic equipment, as shown in FIG. 7, a pneumatic element 12 is moved from a transmission position of a pneumatic tube 1 to a reception position.
When the air is transferred, the activation of the exhaust fan 9 and the opening of the air supply valve 6 are performed at the same time, whereby the pneumatic element 12 starts to move gradually as the force of the air flow generated in the air supply pipe 1 increases. Pneumatic feeding is started. In other words, the pneumatic feeding is performed according to the outcome of the pneumatic element 12 that starts to move by the transient (unstable) air flow generated by the start of the exhaust fan.

[0004]

By the way, in a stable pneumatic state, the difference between the velocity of the pneumatic element (pneumatic velocity) and the air flow velocity is substantially constant, which is the performance of the pneumatic velocity of the pneumatic equipment. Deserve. However, the conventional pneumatic method described above has a considerable distance until the stable pneumatic velocity is reached.

For example, as can be seen from the velocity distribution at the time of air supply of 600 [m] or less shown in FIG. 3, in the conventional air supply method, a stable velocity of 10 [m / s] or more (with respect to the air flow velocity). 100 [m] until it reaches
It takes more distance. This is due to the fact that, before the airflow is stable and has sufficient fluid force, the airflow is started by relying on the outcome of the unstable airflow when the exhaust fan is started.

[0006] Further, when it is necessary to perform pneumatic feeding in a specified speed range, a problem arises in the conventional pneumatic method in which the pneumatic speed does not immediately become a stable speed. In particular, when the pneumatic distance is short, there is a possibility that the pneumatic feeding is terminated before reaching the stable speed. Therefore, the capacity of the exhaust fan is increased (the air flow rate is increased) to improve the pneumatic speed. Such measures not only increase capital investment but also do not provide an effective solution. Further, since a stable pneumatic velocity state is hardly reached, the time required for pneumatic transportation also becomes longer.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmission method in a pneumatic facility capable of rapidly accelerating to a stable speed at the beginning of pneumatic transport and shortening the time required for pneumatic transport. is there.

[0008]

According to a first aspect of the present invention for solving the above-mentioned problems, a pipe is provided from a transmission position to a reception position, an exhaust fan is connected to the pipe, and the pipe is inserted from the transmission position into the pipe. In the pneumatic equipment that transfers the object to be transferred to the receiving position by the force of the air flow generated in the pipe by the exhaust fan, the exhaust fan is started at the start of the transfer, and the pressure in the pipe is reduced. A transmission method in a pneumatic facility, wherein the transfer of the transfer object is started later.

[0009] The second invention of the present application for solving the above problems is as follows.
The transmission method according to claim 1, wherein the transfer is started when a reduced pressure amount in the pipe reaches a predetermined value.

[0010] The third invention of the present application for solving the above-mentioned problems is as follows.
The transmission method according to claim 2, wherein the transfer is started by using a pressure switch or a timer to start a signal indicating that the reduced pressure amount has reached a predetermined value. .

A fourth invention of the present application for solving the above problems is
The transmission method according to claim 1, wherein the pressure reduction amount is adjusted so as to be a target initial speed by using a relational expression between the pressure reduction amount obtained in advance and the initial speed of the transfer target. is there.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a transmission method in a pneumatic facility according to the present invention will be described in detail with reference to the drawings using embodiments.

[First Embodiment] FIG. 1 is a schematic configuration diagram of a pneumatic facility showing a first embodiment of the present invention.

In FIG. 1, reference numeral 1 designates a pneumatic pipe provided between a transmitting position and a receiving position, and a pneumatic element 12 to be transferred is inserted into the pneumatic tube 1 at the transmitting position. A transmission device 2 is provided for receiving the air.
There is provided a receiving device 3 for receiving and further taking out.

An air supply pipe 4 is connected to the transmission apparatus 2. An air supply valve 6 and a filter 8 are interposed in the air supply pipe 4.
An exhaust fan 9 is connected via an exhaust pipe 5 provided with an exhaust valve 7 and a filter 8. The air blower 1 is driven by the air blower 9.
An air flow is created inside.

The air pipe 1 has a confidential structure from the transmitting device 2 to the receiving device 3, that is, over the entire length. Further, the pneumatic element 12 is, for example, a container called a jug, in which a sample or the like collected is stored. The outer shape of the pneumatic element 12 has a size corresponding to the inner diameter of the pneumatic tube 1.

In this embodiment, when starting the air supply, the air blower 9 is activated in advance to reduce the pressure in the air supply pipe 1 and then the air supply valve 6 is opened to start the air supply. It is supposed to.

Thus, as can be seen from the procedure of the in-pipe depressurized air supply method shown in FIG. 5, when the pressure in the air supply pipe 1 is reduced, the air supply pipe 1 side and the air supply pipe 4 side with the air supply valve 6 as a boundary. When the air supply valve 6 is opened, the air flow vigorously enters the air supply pipe 1 and accelerates the air supply element 12 when the air supply valve 6 is opened. As a result, the acceleration at the start of the pneumatic feeding is stably large, and quickly reaches a stable pneumatic speed. In addition, since the speed is high from the start of pneumatic feeding, the time required for pneumatic feeding is reduced.

For example, as can be seen from the velocity distribution at the time of air supply of 600 [m] or less shown in FIG. 3, in this experiment, air supply was performed with air supply speed conditions of 10 to 20 [m / s]. However, according to the reduced-pressure pneumatic method in the main pipe, 1
When the speed reaches 10 [m / s] or more at a speed less than [m],
Thereafter, air can be pumped within the specified speed. On the other hand, it can be seen that the conventional pneumatic method requires 100 [m] or more to reach 10 [m / s] or more.

Further, in the conventional method, there is a case where a phenomenon occurs in which the pneumatic element 12 vibrates due to insufficient airflow force at the start of pneumatic feeding. Such a phenomenon does not occur because acceleration is performed with a large stable force.

As described above, the speed can be accelerated by opening the air supply valve 6 after the pressure in the air supply pipe 1 is reduced and then starting the air supply. , But cannot specify (control) the arrival speed.

Therefore, in this embodiment, a pressure switch 10A is further provided, and when the pressure (the amount of pressure reduction) in the pneumatic tube 1 detected via the tube 11b reaches a predetermined pressure, the air supply valve via the cable 11a. 6, an open signal is output, and pneumatic feeding is started.

Thus, when the air supply valve 6 is opened, as can be seen from the procedure of the pressure-reducing air supply method by the pressure measuring device 10 including the pressure switch 10A shown in FIG.
Due to the pressure difference described above, the air flow vigorously enters the pneumatic tube 1 to accelerate the pneumatic element 12 and obtain a specified initial velocity (pneumatic velocity reached by acceleration).

That is, the main forces acting on the pneumatic element 12 at the time of the acceleration are the force due to its own weight, friction with the pneumatic tube 1, and the air flow flowing due to the pressure difference. At this time, in the practical range of the reduced pressure amount for accelerating the pneumatic element 12 and adjusting the speed, the force acting on the pneumatic element 12 is dominated by the force of the air flow, and the force is proportional to the pressure difference. I do. this is,
The air velocity reached by acceleration can be represented by a mathematical model formula with the amount of reduced pressure as a variable, and the model can be sufficiently approximated by a linear expression.

The constant of this linear expression can be determined by the pressure loss of the air piping system such as the transmission device 2, the air supply valve 6, the air supply pipe 4, etc., and the shape, size, and mass of the air feeder 12.
That is, the air velocity due to the initial acceleration is represented by the following equation.

## EQU1 ## where: v _ini = aD + b where: v _ini : Pneumatic velocity reached by initial acceleration D: Depressurization amount a, b: Constants determined by equipment specifications at transmission point and specifications of pneumatic element

FIG. 4 shows a theoretical value (model equation graph) when an initial velocity (accelerated and reached air velocity) control is performed by a reduced pressure amount in a certain pneumatic facility, and an actually measured value by this control. The linear expression and the graph in this figure show the slope and the like (that is, the constants a and b of the linear expression) due to the characteristic pressure loss of the pressure loss at the transmission point (the supply valve 6, the transmission device 2, etc.) of the equipment.
Changes.

As described above, in this embodiment, by adjusting the amount of reduced pressure, the air feeding speed can be immediately increased to the specified speed after the start of air feeding (within several tens of cm after the start of air feeding). Can accelerate to the specified speed). Also, this speed can be controlled.

Therefore, when an object containing a radioactive substance needs to be pumped at a speed higher than a specified speed due to shielding, when the speed is to be set to a specified speed immediately after the start of air feeding, or when it is necessary to shorten the air feeding time. This embodiment is particularly effective.

[Second Embodiment] FIG. 2 is a schematic configuration diagram of a pneumatic facility showing a second embodiment of the present invention.

This is because, instead of the pressure switch 10A in the first embodiment, the air supply valve 6 is controlled by the reduced pressure amount.
This is an example in which the timer 10B is used on the basis of the pressure reduction data of the pressure inside the air supply pipe 1 after the start of the exhaust fan 9, and the same operation and effect as in the first embodiment can be obtained. . You.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0032]

According to the first aspect of the present invention, a pipe is provided from the transmission position to the reception position, and an exhaust fan is connected to the pipe so that the object to be transferred that is put into the pipe from the transmission position can be transferred to the pipe. In a pneumatic facility that transfers to the reception position by the force of the air flow generated in the pipe by an exhauster, the exhauster is started at the start of the transfer, and the transfer of the transfer object is performed after the pressure in the pipe is reduced. Since the transfer is started, the transfer speed can be immediately increased to the speed within the speed condition after the transfer is started by effectively utilizing the existing equipment, the speed can be increased, and the vibration of the transfer target can be avoided.
Further, since the speed is high from the start of the transfer, the time required for the transfer is reduced.

According to the second aspect of the present invention, the transfer is started when the reduced pressure in the pipe reaches a predetermined value.
In addition to the effect of the first aspect, after the transfer is started, the vehicle can be accelerated to a specified speed immediately, and the speed can be controlled.

According to the third aspect of the present invention, the transfer is started by using a pressure switch or a timer to start a signal indicating that the reduced pressure amount has reached a predetermined value.
In addition to the effects described above, it is possible to accelerate to a specified speed immediately after starting the transfer and control this speed by simple means.

According to the fourth aspect of the present invention, the pressure reduction amount is adjusted so as to reach the target initial speed by using the relational expression between the pressure reduction amount obtained in advance and the initial speed of the transfer object. In addition to the effect, the initial speed (transfer speed) can be quickly and arbitrarily variably controlled.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a pneumatic facility showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a pneumatic facility showing a second embodiment of the present invention.

FIG. 3 is a comparison diagram of velocity distribution between a pneumatic pump according to the present invention and a conventional pneumatic pump method.

FIG. 4 is a diagram illustrating an example of a theoretical value (a graph of a model formula) of an initial speed control based on a reduced pressure amount and an actual measurement value.

FIG. 5 is a diagram showing a procedure of a method of reducing air pressure in a pipe according to the present invention.

FIG. 6 is a diagram showing a procedure of a pressure-reducing and adjusting pneumatic feeding method according to the present invention.

FIG. 7 is a diagram showing a procedure of a conventional pneumatic feeding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic pipe 2 Transmitting device 3 Receiving device 4 Air supply pipe 5 Exhaust pipe 6 Air supply valve 7 Exhaust valve 8 Filter 9 Air blower 10 Pressure measuring device 10A Pressure switch 10B Timer

Claims (4)

[Claims] 1. A pipe is provided from a transmission position to a reception position, and an exhaust fan is connected to the pipe, and an object to be transported into the pipe from the transmission position is generated in the pipe by the exhaust fan. In the pneumatic equipment for transferring to the receiving position by the force of the air flow, a blower is started at the start of the transfer, and the transfer of the transfer object is started after the pressure in the pipe is reduced. Transmission method in equipment. 2. The transmission method according to claim 1, wherein the transfer is started when a reduced pressure amount in the pipe reaches a predetermined value. 3. The pneumatic installation according to claim 2, wherein the transfer is started by using a pressure switch or a timer to start a signal indicating that the reduced pressure amount has reached a predetermined value. Transmission method in. 4. The pneumatic pump according to claim 1, wherein the pressure reduction amount is adjusted so as to reach the target initial speed by using a relational expression between the pressure reduction amount obtained in advance and the initial speed of the transfer object. Transmission method in equipment.