JPH0318940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an air supply device for an air moving jig that supplies and discharges air to an air moving jig that sorts powder and granular materials based on the difference in specific gravity.

First, the pneumatic jig will be explained with reference to FIGS. 1 and 2.

A plurality of water tanks 3 are formed within the casing 1 by partition plates 2, and an air chamber 4 is arranged within the water tank 3. A mesh member 5 is provided in the upper part of the water tank 3, a powder supply port 6 is provided in the upper part of one end of the casing 1, and a light powder and granule material discharge port is arranged vertically in the upper part of the other end. An outlet 7 and a heavy powder discharge port 8 are provided. An air pipe 9 penetrating from the outside of the casing 1 is provided inside the air chamber 4, and a water pipe 10 penetrating from the outside of the casing 1 is provided at the lower part of the water tank 3.

Water is stored in the water tank 3. Powder is supplied onto the net-like member 5 from the powder supply port 6 .
Pressure air is periodically supplied and discharged into the air chamber 4 from an air pipe 9. By periodically supplying and discharging pressurized air, the water surface in the water tank 1 vibrates up and down, and as the water moves upward, powder and granules with low specific gravity are taken out from the light powder and granule discharge port 7 along with overflow water, and powder with high specific gravity is removed. The granules move below the bed and are taken out from the heavy granule discharge port 8, thereby separating the granules into light and heavy particles. In order to prevent the water in the water tank 1 from becoming less than a predetermined amount, water is replenished from a water pipe 10.

In order to supply and discharge air to and from the air chamber 4 through the air pipe 9 of this pneumatic jig, an air supply and discharge device shown in FIGS. 3 and 4 has conventionally been used.

In FIGS. 3 and 4, an air supply port 12 and an air exhaust port 13 are located at opposing positions on the side wall of the cylindrical external casing 11 and communicate with a pressurized air supply means (not shown).
A communication port 14 communicating with the air 9 shown in FIGS. 1 and 2 is also provided. Inside the outer casing 11, there is a drive unit driven by a drive means (not shown),
Cylindrical inner casing 15 rotating at a constant speed
is located. The outer wall of the inner casing 15 and the inner wall of the outer casing 11 are made airtight. Both ends of the internal casing 15 are open so that the inside of the internal casing 15 communicates with the communication port 14, and the side wall of the internal casing 15 has a communication port 1.
6 is provided. Note that 17 and 18 are slide gates for adjusting the cross-sectional areas of the air supply port 12 and the exhaust port 13, respectively.

When the inner casing 15 rotates and the flow port 16 faces the air supply port 12, pressurized air flows through the air supply port 12,
It enters the inside of the inner casing 15 through the flow port 16, flows from the inside of the inner casing 15 through the end of the inner casing 15 to the communication port 14, enters the air pipe 9 from the communication port 14, and enters the air pipe 9, for example, 0.2 to 0.4
Air under pressure of Kg/cm ² enters the air chamber. When the inner casing 15 rotates further, the inflow of pressurized air stops, and when the inner casing 15 rotates further, the flow port 16 faces the exhaust port 13. When the communication port 16 faces the exhaust port 13, the air in the air chamber 4 is transferred to the air pipe 9 and the communication port 14.
The flow from the end of the inner casing 15 to the inside of the inner casing 15 through the flow opening 16,
It is discharged through the exhaust port 13. With this device, air is alternately supplied and exhausted, and the pressure state within the air chamber 4 takes on the shape of an upward slope of a sine curve as shown in Figure 5a. The vibration of the water becomes a sine curve with a phase lag, as shown in Figure 5b. This powder fluid is always subjected to either an upward or downward force, and there is no free fall period for the powder and granules necessary for sorting, resulting in poor sorting efficiency.

The ideal water level waveform for sorting is the one shown by the bold line in Figure 6. In order to cause good separation and stratification of particles with different specific gravity and size, the upward acceleration of the water is increased at first, and then the water level is It is necessary to instantly lift up a group of particles and allow the water to stand still for a while to allow each particle to fall freely and improve its "unraveling." For this purpose, as shown at the bottom of Figure 6,
This is possible by alternately supplying two types of air to the air chamber.

However, if such a method is adopted, two systems of air with different pressures must be sent separately,
Two systems of air supply devices are required, which has the disadvantage that the structure of the air supply device is complicated and expensive.

The present invention has been proposed for the purpose of solving the above-mentioned drawbacks, and an air chamber with an open bottom end is disposed in a water tank filled with water, and pressurized air is supplied and discharged into the air chamber. In the process of supplying pressurized air to the air chamber of the pneumatic jig, which vibrates the water up and down to separate the powder and granules to be sorted by the difference in specific gravity, two different pressures are applied.
When supplying pressurized air of more than 1,000 liters, the pressurized air generated from one pressurized air supply device is temporarily stored in an air tank, and the air tank is equipped with at least a plurality of low-pressure air supply pipes equipped with pressure reducing valves. Provided is an air supply device for an air moving jig, characterized in that air supply pipes are connected and pressure air of different pressures is supplied into the air chamber through the air supply pipes.

According to the device of the present invention, one air supply device can supply two or more types of pressurized air with different pressures to the air chamber, so when two or more systems of air supply devices are separately provided as in the conventional case, In comparison, it is possible to achieve significant simplification of the device and reduction in operating power.

Next, one embodiment of the device of the present invention will be described based on the drawings.

FIG. 7 shows an air supply valve that sends air to the air chamber of the pneumatic jig. In the figure, a high-pressure air supply port 22 and an exhaust port are connected to a side wall of a cylindrical external casing 21 with a pressurized air supply means (not shown). 23 and a low pressure air supply port 24 are provided, and a communication port 25 communicating with the air pipe is provided. External casing 21
A cylindrical inner casing 26 is disposed inside, which is driven by a drive means (not shown) and rotates at a constant speed. The outer wall of the inner casing 26 and the inner wall of the outer casing 21 are made airtight. Both ends of the internal casing 26 are open so that the inside of the internal casing 26 communicates with the communication port, and a communication port 27 is provided in the side wall of the internal casing 26. Note that 28, 29, 30, and 31 are slide gates for adjusting the cross-sectional areas of the high-pressure air supply port 22, the exhaust port 23, the low-pressure air supply port 24, and the flow port 27, respectively. Also, when looking at the circular cross section of the external casing 21, the center line of the high pressure air supply port 22 and the low pressure air supply port 24 are
The center line of the low pressure air supply port 24 and the center line of the exhaust port 23 maintain an angle of 115°, and the center line of the exhaust port 23 and the center line of the high pressure air supply port 22 is formed to maintain an angle of 145°.

The internal casing 26 rotates at 27 to 55 rpm, and when the flow port 27 faces the high pressure air supply port 22, the rotation rate is 0.5 to 0.7
Kg/cm ² of high pressure air is supplied to the high pressure air supply port 22 and the distribution port 2.
7 into the interior of the inner casing 26;
From the inside of the inner casing 26 to the inner casing 2
6 and flows to the communication port 25 through the end of the communication port 25.
It enters the air pipe and enters the air chamber. When the internal casing 26 further rotates, the low-pressure air supply port 24 and the circulation port 27 face each other, and low-pressure air of 0.2 to 0.4 Kg/cm ² passes through the low-pressure air supply port 24 and the communication port 27 to the inside of the internal casing 26. and flows into the air chamber like high-pressure air. Further, when the inner casing rotates further, the flow port 27 faces the exhaust port 23. When the communication port 27 faces the exhaust port 23, the air in the air chamber passes through the air pipe and the communication port 25, flows from the end of the internal casing 26 into the interior of the internal casing 26, and further passes through the communication port 27 and the exhaust port 23. It is then discharged.

FIG. 8 shows an air supply device that supplies two types of differently pressurized air to the air supply valve 20 shown in FIG.
In the figure, air supplied from a blower 41 first enters a high-pressure air tank 42, and then is sent to the air chamber via an air supply valve 20 that determines the timing of air supply and exhaust, but low-pressure air is supplied to a low-pressure pressure reducing valve. 4
The air enters a low-pressure air tank 47 through a conduit 43 with a pipe 6 interposed therebetween, and is then supplied to a low-pressure air supply port 24 of an air supply valve 20 through a conduit 44. On the other hand, high pressure air is pipe 4
5 and is supplied to the high pressure air supply port 22 of the air supply valve 20.

FIG. 9 shows another embodiment of the device of the present invention, and in the figure, the pressure air sent from the blower 51 to the main pressure air tank 42 passes through the low pressure reducing valve 56 and the low pressure air tank 57, respectively, to the conduit 53, 54 and high pressure air sent from pipes 55 and 58 via a high pressure reducing valve 59 and a high pressure air tank 60. The low pressure air is sent to the low pressure air supply port 24 of the air supply valve 20, Air is supplied to high pressure air inlets 22 of air supply valves 20, respectively. However, in this case, the pressure in the original pressure air tank 52 must be higher than that in the high pressure air tank 60, and the power required for the blower 51 is greater than in the case of the device shown in FIG. With this device,
As shown in Figure 6a, high-pressure air supply, low-pressure air supply, and exhaust are performed alternately, and as a result, the air pressure in the air chamber is slightly higher than that of air supply and exhaust, as shown by the broken line in Figure 6b. The phase lags and becomes higher or lower, and due to the air pressure in the air chamber, the water level rises rapidly as shown by the solid line in Figure 6b, and once it reaches the highest level, it gradually decreases at an almost constant speed. , the granular material receives an upward force, but receives almost no downward force, and falls freely. Therefore, the effect of sorting out light items and heavy items is improved.

In these devices, when supplying two types of differently pressurized air to the air supply valve, it is only necessary to deploy one blower, instead of supplying two types of differently pressurized air with two blowers, respectively. Equipment costs and operating power can be significantly reduced compared to the conventional method.

The above two embodiments are cases in which an integrated air supply valve 20 is used, but the invention is not limited to this, and the air supply valve that receives high pressure air and the air supply valve that receives low pressure air are separated. You can also use the body. An example in which this separate air supply valve is used will be described below.

10 to 12, it has two external casings 21 and 21', and a high-pressure air supply port 22 is provided in the side wall of one of the external casings and communicates with high-pressure air supply means (not shown), and A communication port 25 communicating with the pipe is provided. A cylindrical inner casing 26 is arranged inside the outer casing 21 and is driven by a driving means 32 and rotates at a constant speed. The outer wall of the inner casing 26 and the inner wall of the outer casing 21 are made airtight.
Both ends of the internal casing 26 are open so that the inside of the internal casing 26 communicates with the communication port, and a communication port 27 is provided in the side wall of the internal casing 26. The side wall of the other external casing 21' is provided with an air supply port 24 and an exhaust port 32 (not shown) communicating with a low-pressure air supply means, and a communication port 25' communicating with an air pipe. Inside the outer casing 21', there is a drive means 32'.
Cylindrical inner casing 2 that rotates at a constant speed
6' is placed. The outer wall of the inner casing 26' and the inner wall of the outer casing 21' are made airtight. Both ends of the inner casing 26' are open so that the inside of the inner casing 26' communicates with the communication port 25', and a communication port 27' is provided in the side wall of the inner casing 26'.

The inner casings 26, 26' are rotated at the same rotational speed by drive means 32, 32'. It is configured such that after the center positions of the high pressure air supply port 22 and the communication port 27 face each other, the center positions of the low pressure air supply port 24 and the communication port 27' face each other with a phase delay of 100 degrees, and The exhaust port 23 is formed to have a phase lag of 115° at the center position with respect to the low-pressure air supply port 24. Note that 28, 29', and 30' are the high pressure air supply port 22, the low pressure air supply port 24, and the exhaust port 2, respectively.
This is a slide gate that adjusts the cross section of 3.

In this device, the air supply/discharge function and the effects thereof are the same as those in the first and second embodiments, and the explanation thereof will be omitted here.

In this embodiment, two inner and outer casings and two drive means are used, but as shown in FIG. The inner casings may be arranged in series, and furthermore, as shown in FIG. They may be connected, and the exhaust port 23 may be provided with an external casing 21 on the high pressure air supply port 22 side.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the pneumatic jig, Fig. 2 is a view taken from the direction of the arrow in Fig. 1, and Figs. 3 and 4 are side sectional views and front sectional views of the air supply/discharge device of the conventional pneumatic jig. Figures 5a and 5b show the pressure of air supplied and discharged by the air supply and discharge device of a conventional pneumatic jig, and
Graph showing changes in water level based on this, Figure 6a
and b are graphs showing improved pressure air supply/discharge patterns, air chamber pressure, and water level waveforms, and Figures 7 and 8 show the first embodiment of the device of the present invention.
8 is a flowchart of the air supply device, FIG. 9 is a flowchart of the air supply device in the second embodiment of the device of the present invention, and FIG. 10 is a flowchart of the air supply device of the second embodiment of the device of the present invention. A perspective view showing the air supply valve in the third embodiment, FIGS. 11 and 12 are lines XI-XI and XII-XII in FIG. 10, respectively.
13 and 14 are perspective views showing the air supply valve in the fourth and fifth embodiments of the device of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Casing, 2... Partition plate, 3... Water tank, 4... Air chamber, 5... Net member, 6... Powder supply port, 7... Light powder and granule discharge port, 8... Heavy powder discharge port, 9...Air pipe, 10...Water pipe, 11,
21, 21'... External casing, 12... Air supply port, 13, 23... Exhaust port, 14, 25, 25'
... Communication port, 15, 26, 26' ... Internal casing, 16, 27, 27' ... Distribution port, 17, 1
8, 28, 29, 30, 31, 29', 30'...
Slide gate, 32, 32'...driving means, 3
3...Power transmission mechanism, 41...Blower, 43,4
4,53,54...Low pressure air pipe line, 45,55,
58... High pressure air pipe line, 46, 56... Low pressure reducing valve, 59... High pressure reducing valve.

Claims (1)

[Claims] 1. An air chamber with an open bottom end is placed in a water tank filled with water, and pressurized air is supplied and discharged into the air chamber to vibrate the water in the tank up and down to cause the particles to be sorted to differ in specific gravity. When supplying two or more types of pressurized air with different pressures to the air chamber of the pneumatic jig to be sorted in the pressurized air supply process, the pressurized air generated from one pressurized air supply device is temporarily stored in an air tank, A plurality of air supply pipes each having a pressure reducing valve interposed in at least a low pressure air supply pipe are connected to the air tank, and pressure air having different pressures is supplied into the air chamber through the air supply pipe. An air supply device for pneumatic jigs featuring: