JP2996603B2 - Powder discharging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging powder and granules stored in a tank.

[0002]

2. Description of the Related Art Conventionally, as a granular material discharging device, for example, disclosed in Japanese Utility Model Laid-Open Publication No. 59-3125, as shown in FIG. A tank a for storing the body, a plurality (two in the figure) of hoppers b provided below the tank a, a gas chamber c provided in each hopper b, and one end of a gas supply c A supply pipe d connected to a source (not shown), and one end is branched so as to open to each of the hoppers b, and the other end is connectable to an external powder transport pipe (not shown). A discharge pipe e that opens, a first branch supply pipe f that branches from the other end of the supply pipe d to the gas chamber c side, and a branch that branches off from the first branch supply pipe f, and the tip of each of the gas chambers c Supply pipes g, g, which open to the hopper section b from the other end of the supply pipe d. Tip and a second branch supply pipe h which opens in the middle of the discharge pipe e, each first branch supply pipe f
And the gas supplied to the gas chamber c via the branch supply pipe g is used to fluidize the powder and granular material in the hopper part b and pressurize the inside of the tank a, and in this state, via the second branch supply pipe h It is known that the gas in the tank a is discharged from the discharge pipe e via a powder and particle transport pipe by gas supplied to the discharge pipe e. And in such a granular material discharge apparatus, the communication position which is provided in the first branch supply pipe f and communicates with the first branch supply pipe f and the communication position where the communication between the first branch supply pipe f is interrupted. The first to switch to
An on-off valve i, an on-off valve j, j provided in each of the branch supply pipes g for switching between a communication position for communicating with each of the branch supply pipes g and a shutoff position for interrupting communication with each of the branch supply pipes g; A second opening / closing valve k which is provided in the second branch supply pipe h and has a variable opening degree for adjusting the supply amount of gas flowing through the second branch supply pipe h.
A flow control valve, a third opening / closing valve m, m provided in the discharge pipe e for switching between a communication position for communicating with the discharge pipe e and a shutoff position for cutting off communication with the discharge pipe e; A pressure sensor n provided in a branch supply pipe g located between the on-off valve i and each on-off valve j to detect the pressure in the tank a; and the first on-off valve when supplying gas to the gas chamber c. A control device p for switching the valve i to the communication position, optimally adjusting the opening of the second on-off valve k when supplying gas to the discharge pipe e, and controlling the third on-off valve m to switch to the communication position; When discharging the granular material from the tank a, the pressure in the tank a is increased to a predetermined pressure range by opening only the first opening / closing valve i and one of the opening / closing valves j. From
The control device p which has received the detection signal from the pressure sensor n
Accordingly, while the first opening / closing valve i is switched, the opening degree of the second opening / closing valve k is finely adjusted so as to be an optimum opening degree, and the pressure in the tank a is adjusted to a predetermined pressure setting range. The discharge of the powder from the tank a can be performed.

[0003]

However, in the above-mentioned conventional particulate discharging device, the switching operation of the first on-off valve i and the fine adjustment of the opening degree of the second on-off valve k are performed when the particulates are discharged from the tank a. Since the pressure in the tank a is set to be within a predetermined range, a control device p having a complicated configuration is particularly required to finely adjust the opening degree of the second on-off valve k. In addition, when the fluidity of the granular material at the time of pressurization in the tank a varies depending on the type of the granular material in the tank a, or when the pressure setting range required in the tank a differs depending on the unloading condition, There is a possibility that the granular material may be clogged in the granular material transport pipe at the time of discharging the granular material, and the operator performs the unloading work in the presence of the operator to adjust the opening degree of the second on-off valve k and to perform the first , Third
It is necessary to perform the switching operation of the on-off valves i and m and the on-off valves j, and there is a problem that a considerable burden is imposed on an operator in consideration of the environment in the vicinity of the granular material discharging device.

The present invention has been made in view of the foregoing, and an object of the present invention is to determine the supply amount of gas in the first and second branch supply pipes by changing the types of powder and granules in the tank and the unloading conditions. And the pressure in the tank is easily set within a predetermined range only by switching the first on-off valve to the communicating position or the shutoff position without finely adjusting the opening degree of the second on-off valve. By doing so, the control means can be simplified, and the burden on the operator can be reduced.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, a solution according to the first aspect of the present invention is to provide a tank for storing powder and granules therein and at least one portion below the tank. Hopper part, a gas chamber provided in the hopper part, a supply pipe one end of which is connected to a gas supply source,
One end is open to the hopper portion, the other end is opened to be connectable to an external powder transporting pipe, and the other end of the supply pipe is branched to the gas chamber side, and the tip is connected to the gas chamber. A first branch supply pipe which opens, and a second branch which branches to the hopper side from the other end of the supply pipe, and has a tip opening in the middle of the discharge pipe.
A branch supply pipe, and the gas supplied to the gas chamber through the first branch supply pipe fluidizes the powder and granules in the hopper and pressurizes the inside of the tank.
It is assumed that the granular material discharge device is configured to discharge the granular material in the tank from the discharge tube through the granular material transport pipe by the gas supplied to the discharge pipe through the branch supply pipe. And a first opening / closing valve for switching the first branch supply pipe to a communication position for communicating the first branch supply pipe and a shutoff position for cutting off the communication with the first branch supply pipe; A first flow rate control valve having a variable opening degree for adjusting the supply amount of the flowing gas; A second on-off valve for switching to the second branch supply pipe between a communication position for communicating the second branch supply pipe and a shutoff position for interrupting communication with the second branch supply pipe, and a flow in the second branch supply pipe; A second flow control valve having a variable opening degree for adjusting a gas supply amount; The discharge pipe is provided with a third opening / closing valve that switches between a communication position for communicating with the discharge pipe and a blocking position for blocking communication with the discharge pipe. Control for switching the first on-off valve to the communicating position when supplying gas to the gas chamber, and for switching the second and third on-off valves to the communicating position when supplying gas to the discharge pipe. Means are provided. Further, the pressure in the tank is gradually increased from a predetermined pressure setting range when the powder and granules are discharged from the tank by the gas supply amount from the two flow rate control valves. The first opening / closing valve is switched from the communicating position to the shut-off position when the pressure in the tank exceeds a predetermined pressure range by adjusting the opening by the two flow regulating valves. It is said that.

The solution taken by the invention according to claim 2 is as follows:
In addition to the constituent features of the first aspect of the present invention, the first opening / closing valve is controlled so as to be switched from the communication position to the cutoff position by the control means when the pressure in the tank exceeds a predetermined pressure range. Things.

[0007] The solution means taken by the invention of claim 3 is:
In addition to the constituent features of the first aspect of the present invention, the first on-off valve is configured to be manually switched from the communication position to the shut-off position when the pressure in the tank exceeds a predetermined pressure range.

[0008] Further, the solution taken by the invention of claim 4 includes, in addition to the constituent features of the invention of claim 1, a first solution.
The branch supply pipe is configured such that a portion located on the gas chamber side with respect to the first on-off valve and the first flow control valve is removable, and the second branch supply pipe is connected to the second on-off valve and the second A part located on the discharge pipe side with respect to the two flow control valves is configured to be removable.

[0009]

According to the above-mentioned structure, according to the first aspect of the present invention,
When discharging the granular material in the tank, first and second
The flow control valve is adjusted to an opening degree according to the type of the granular material in the tank and the unloading condition, the second on-off valve and the third on-off valve are closed, and the first on-off valve is opened. 1
The powder in the hopper is fluidized by a desired amount of gas supplied to the gas chamber through the first branch supply pipe by adjusting the opening degree by the flow control valve, and the inside of the tank is pressurized to a predetermined pressure range. In this state, the second on-off valve and the third on-off valve are opened, and a desired amount of gas supplied to the discharge pipe through the second branch supply pipe by the opening adjustment by the second flow rate control valve causes the inside of the tank to be opened. The powder is discharged from the discharge pipe via the powder transport pipe.

In this case, the pressure in the tank at the time of discharging the particulate material from the tank is determined by the amount of gas supplied to the gas chamber via the first branch supply pipe by the first flow control valve. And the amount of gas supplied to the hopper through the second branch supply pipe and the discharge pipe by the second flow control valve, the pressure is gradually increased from a predetermined pressure setting range. By switching the first opening / closing valve from the communicating position to the shut-off position when the pressure exceeds the set range, the gradual increase in the pressure in the tank is suppressed. By switching the on-off valve from the shut-off position to the communication position, the inside of the tank is pressurized, and the pressure in the tank is returned to the pressure setting range. Turn the valve to the open or closed position Pressure only in the tank operating is adjusted within a predetermined pressure setting range, only the switching operation of the first on-off valve the discharge of granular material smoothly.

[0011] Accordingly, when the powdery material is discharged from the tank, only the switching operation of the first on-off valve is required, and it is not necessary to finely adjust the opening degree of the second on-off valve, so that the configuration of the control means is simple. Becomes Moreover, as described above, the setting within the predetermined pressure range in the tank according to the type of the granular material in the tank and the unloading condition is performed by adjusting the gas supply amount by the first and second flow rate control valves. Since it can be performed only by the switching operation of one on-off valve, it is necessary to set the pressure in the tank within a predetermined pressure range according to the type of the granular material in the tank and the unloading condition. The opening adjustment and the switching operation become unnecessary, and the burden on the operator is reduced.

According to the second aspect of the present invention, the first on-off valve is
When the pressure in the tank exceeds a predetermined pressure range by the control means, the communication position is switched to the shut-off position, so that the control required to set the pressure in the tank within the predetermined pressure range is performed by the first on-off valve. Can be simply switched between two positions, and the structure of the control means can be simplified, and the presence of an operator is not required at the time of discharging the granular material, and the burden on the operator is greatly reduced. You.

According to the third aspect of the invention, the first on-off valve is
When the pressure in the tank exceeds a predetermined pressure range, the communication position is manually switched from the communication position to the cutoff position, so that the first pressure necessary for setting the pressure in the tank within the predetermined pressure range is obtained.
The switching operation of the on-off valve is performed manually, so that control by the control means is not required, and the configuration of the control means is further simplified.

Further, according to the present invention, portions of the first branch supply pipe and the second branch supply pipe located on the gas chamber side and the discharge pipe side with respect to the respective on-off valves and the respective flow control valves are removable. Therefore, it is possible to provide a valve set including the respective on-off valves and the respective flow control valves on the gas supply source side, and it is not necessary to provide this valve set for each tank. Only one set needs to be provided on the supply source side, and the valve set on the gas supply source side can correspond to a plurality of tanks. In addition, the number of pipes that are always connected to the tank of the granular material discharge device is reduced, and the periphery of the tank is simplified, so that the tank can be moved smoothly.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a granular material discharging device according to a first embodiment of the present invention. The granular material discharging device 1 is mounted on a bulk trailer (not shown) pulled by a tractor (not shown). It has become so. The above-mentioned granular material discharge device 1
Is a tank 2 for storing quicklime as a granular material inside
And hoppers 3 and 3 provided at two locations in front of and below the tank 2, and a gas chamber 4 provided at the bottom of each hopper 3.
And a supply pipe 5 having one end connected to a nitrogen gas supply source (not shown) serving as a gas supply source installed at an unloading station (not shown), and branching from the middle to each of the hopper sections 3. And a discharge pipe 6 whose one end is open to each hopper section 3 and the other end is openably connectable to an external powder transport pipe (not shown), and the other end of the supply pipe 5. A first branch supply pipe 7 that further branches toward each gas chamber 4 side;
A base end is branched from a tip of the first branch supply pipe 7, and a tip of the branch supply pipe 7 a is opened to each of the gas chambers 4.
7a, and a second branch supply pipe 8 branched from the other end of the supply pipe 5 to the hopper section 3 side, and the leading end of which is opened in the middle of the discharge pipe 6. Each of the hopper sections 3 is formed of a cone-shaped slide plate for collecting quicklime at one end of a discharge pipe 6 opened at a lower portion of the tank 2.
The hopper 3 and the gas chamber 4 are partitioned by a steel plate 9 provided with a plurality of fine holes on the entire surface and a canvas cloth (not shown) attached to the side of the hopper 3 of the steel plate 9. This allows only the flow of nitrogen gas from the gas chamber 4 side to the hopper section 3 side. And the first branch supply pipe 7
From the hopper section 3 and pressurize the tank 2 with nitrogen gas supplied to the gas chamber 4 through the respective branch supply pipes 7a through the respective branch supply pipes 7a. The quick lime in the tank 2 is discharged from the discharge pipe 6 through the powder transporting pipe by the nitrogen gas supplied to the discharge pipe 6.

The first branch supply pipe 7 has a first opening / closing valve 11 that switches between a communication position for communicating with the first branch supply pipe 7 and a shutoff position for cutting off the communication with the first branch supply pipe 7. A first flow control valve 12 having a variable opening degree for adjusting the supply amount of the nitrogen gas flowing in the first branch supply pipe 7 is provided.
Each of the branch supply pipes 7a is provided with an on-off valve 13 for switching between a communication position for communicating with each of the branch supply pipes 7a and a cutoff position for interrupting communication with the branch supply pipe 7a. The second
The branch supply pipe 8 includes a second opening / closing valve 14 that switches between a communication position that communicates with the second branch supply pipe 8 and a cutoff position that blocks communication with the second branch supply pipe 8, and the second branch supply pipe. A second flow control valve 15 having a variable opening degree for adjusting the supply amount of the nitrogen gas flowing through the inside 8 is provided. One end portions 6a, 6a located closer to each hopper portion 3 than the middle portion (branch portion) of the discharge pipe 6 are connected to a communication position connecting the one end portions 6a and a communication between the one end portions 6a. Third on-off valves 16, 16 are provided for switching to a shut-off position for shutting off. The on-off valves 11, 13, 14, and 16 are controlled to open and close by a control device 17 as control means. When the nitrogen gas is supplied to each gas chamber 4, the first on-off valves 11, 13, 14, and 16 are controlled. In addition, while controlling each of the on-off valves 12 to the communicating position, the second on-off valve 14 and each of the third on-off valves 16 are controlled to be switched to the communicating position when the nitrogen gas is supplied to the discharge pipe 6. An operation switch (not shown) of the control device 17 is provided on an operation control panel attached to one side surface of the bulk trailer, and the operation switch allows the on-off valves 11, 13, 14,. Air is supplied to or discharged from the control valve 16 as needed, and the switching operation of the on-off valves 11, 13, 14, 16 is performed from the operation control panel under the control of the control device 17.

In addition, at two places before and after the upper surface of the tank 2, there are inlets 21 for introducing quicklime into the tank 2,
21 are provided. Each of the inlets 21 is provided with a butterfly valve 22 that opens and closes by supplying and discharging air.
The butterfly valve 22 is operated by a switch (not shown) on the operation control panel.

The first and second flow control valves 1
Reference numerals 2 and 15 denote a predetermined pressure setting range required for discharging the quicklime when the quicklime is discharged from the tank 2 by the supply amount of the nitrogen gas from the two flow control valves 12 and 15. It is provided in a state where the opening degree is adjusted so as to gradually increase from. Further, the first on-off valve 11
Is provided so that when the pressure in the tank 2 exceeds a predetermined pressure range due to the opening adjustment by the two flow control valves 12 and 15, the operation is switched from the communication position to the cutoff position. The branch supply pipe 7a located between the first on-off valve 11 and each of the on-off valves 13 is provided with a pressure sensor 23 for detecting the pressure in the tank 2.
3 is output to the control device 17, and the control device 17 moves the first on-off valve 11 from the communicating position to the shut-off position when the pressure in the tank 2 exceeds a predetermined pressure setting range. And the switching of the first on-off valve 11 from the shut-off position to the communication position when the pressure in the tank 2 falls below a predetermined pressure setting range.

Here, the opening and closing control of each of the on-off valves 11, 13, 14, and 16 by the control device 17 will be described based on a procedure for discharging quick lime from the tank 2 (unloading).

First, when discharging the quicklime in the tank 2, the first and second flow control valves 12 and 15 are adjusted in advance to an opening corresponding to the type of quicklime in the tank 2 and the unloading condition. The second opening / closing valve 14 and the third opening / closing valve 16 are closed, and only the first opening / closing valve 11 and the desired one of the opening / closing valves 13 are opened. With the adjustment, a desired amount of nitrogen gas supplied from the supply pipe 5 to the one gas chamber 4 via the first branch supply pipe 7 and the one branch supply pipe 7a fluidizes the quicklime in the one hopper section 3 and the tank. 2 has a predetermined pressure setting range, for example, 1.4 kgf / cm ^{2 to} 1.6 kgf / cm ^2.
Pressurized to within the pressure range. In this state, the second on-off valve 1
4 and the third opening / closing valve 16 are opened, and the opening degree of the second flow control valve 15 is adjusted so that the supply pipe 5 is connected to the second branch supply pipe 8.
The quick lime on one hopper 3 side in the tank 2 is discharged by the desired amount of nitrogen gas supplied to the discharge pipe 6 through the discharge pipe 6.
And discharged through quicklime transport piping. When the pressure in the tank 2 decreases despite the pressurization of the tank 2, it is determined that the quicklime on the one hopper 3 side has been completely discharged, and the second on-off valve 14 and the third on-off valve The valve 16 is closed and only the first opening / closing valve 11 and the other opening / closing valve 13 are opened, and the other hopper section is supplied with a desired amount of nitrogen gas supplied to the other gas chamber 4 via the other branch supply pipe 7a. 3 and pressurize the inside of the tank 2 to a predetermined pressure setting range. In this state, the second on-off valve 1
4 and the third on-off valve 16 are opened, and the second branch supply pipe 8 is opened.
The quick lime on the other hopper 3 side in the tank 2 is discharged by the desired amount of nitrogen gas supplied to the discharge pipe 6 through the discharge pipe 6.
Is discharged through the quicklime transport pipe, and when the pressure in the tank 2 drops despite the pressurization of the tank 2, it is determined that the quicklime on the other hopper 3 side has also been discharged and unloaded. Finish the work.

In this case, the pressure in the tank 2 at the time of discharging the quick lime for discharging quick lime from the inside of the tank 2 depends on the supply amount of the nitrogen gas to the gas chamber 4 adjusted by the first flow control valve 12 and the second flow rate. The pressure is gradually increased from a predetermined pressure setting range by the supply amount of the nitrogen gas to the discharge pipe 6 adjusted by the adjustment valve 15, so that when the pressure in the tank 2 exceeds the pressure setting range, that is, 1.6 kgf By switching the first opening / closing valve 11 from the communication position to the shut-off position when the pressure becomes equal to or more than / cm ² , the pressure in the tank 2 gradually decreases while the pressure in the tank 2 falls below the pressure setting range. When the pressure becomes 1.4 kgf / cm ² or less, the first on-off valve 11 is switched from the shut-off position to the communication position to pressurize the inside of the tank 2 so that the pressure in the tank 2 becomes within the pressure setting range. Will be returned within When the quick lime in the tank 2 is discharged, the pressure in the tank 2 is adjusted within a predetermined pressure setting range only by switching the first on-off valve 11 to the communication position or the shutoff position, and the first on-off valve 2 is switched. The quicklime is discharged smoothly only by the operation.

With this arrangement, when discharging the particulate material from the tank, only the switching operation of the first opening / closing valve is required, and it is not necessary to finely adjust the opening degree of the second opening / closing valve, and the control device 17 is simplified. be able to. Moreover, as described above, the tank 2
The setting within the predetermined pressure range in the tank 2 according to the type of quicklime in the tank and the unloading condition is performed by adjusting the supply amount of the nitrogen gas by the first and second flow control valves 12 and 15 to the first opening / closing valve. Since the operation can be performed only by the switching operation of No. 11, the opening degree of each on-off valve required for setting the pressure in the tank within a predetermined pressure range according to the type of the granular material in the tank and the unloading condition. No adjustment and switching operations are required,
The switching operation of the on-off valve 11 can also be performed by the control device 17, so that the worker does not need to be present at the unloading work, and the burden on the worker can be greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the second embodiment, the first branch supply pipe and the second branch supply pipe are configured to be separable into a tank side and a nitrogen gas supply source side.

That is, in this embodiment, as shown in FIG. 2, the first branch supply pipe 7 is a
It is divided into a tank-side first branch supply pipe section 32 and a nitrogen gas supply source-side first branch supply pipe section 33 via a coupler 31 so as to be separable. In addition, a first on-off valve 11 and a first flow control valve 12 are interposed. On the other hand, the second branch supply pipe 8 can be separated into a tank-side second branch supply pipe section 35 and a nitrogen gas supply source-side second branch supply pipe section 36 via a second coupler 34 which is also detachable with one touch. The second on-off valve 14 and the second flow control valve 15 are interposed in the second branch supply pipe portion 36 on the nitrogen gas supply source side. Each of the above couplers 3
The male couplers 31a and 34a attached to the tank-side first branch supply pipe section 32 and the tank-side second branch supply pipe section 35 at opposite ends of the tank side, respectively, and the male coupler 31a, 34a detachable female coupler 31
b, 34b. A flexible air hose 37 is provided at the distal end of the nitrogen gas supply side first branch supply pipe 33 and the nitrogen gas supply side second branch supply pipe 36.
Are connected to each other, and the female couplers 31b and 34b are attached to the other ends of the air hoses 37, respectively. In this case, erroneous mounting of the couplers 31 of the first branch supply pipe 7 and the second branch supply pipe 8 by color matching, a nameplate, or the like is prohibited. The configuration other than the first and second branch supply pipes is the same as that of the above-described embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Therefore, in this embodiment, the first on-off valve 1
The first and first flow control valves 12 are provided on the nitrogen gas supply side first branch supply pipe 33, and the second on-off valve 14 and the second flow control valve 15 are provided on the nitrogen gas supply side second branch supply pipe 36, respectively. Provided, the first and second on-off valves 11,
It is not necessary to provide a valve set consisting of the first and second flow rate regulating valves 12 and 15 for each tank 2, and only one set of this valve set needs to be provided on the nitrogen gas supply source side, thereby reducing costs. While being able to
The valve set on the nitrogen gas supply source side can be made to correspond to a plurality of tanks, so that the valve set can be shared. Moreover, the number of pipes that are constantly connected to the tank 2 of the granular material discharging device 1 is reduced, and the periphery of the tank 2 is simplified, so that the movement of the tank 2 can be performed smoothly.

Next, a modification of the second embodiment will be described with reference to FIG.

In this modification, the ends of the first branch supply pipe (branch supply pipe) and the second branch supply pipe are configured to be detachable from the tank.

That is, in this modified example, as shown in FIG. 3, each branch supply pipe 7a is a first detachable one-touch detachable supply pipe.
The coupler 41 is detachably connected to the gas chamber 4. On the other hand, the second branch supply pipe 8 is detachably connected to the discharge pipe 6 by a second coupler 42 which can be attached and detached with a single touch. Each of the above couplers 41 and 42
Are male couplers 41a42a attached to the gas chamber 4 and the discharge pipe 6, respectively.
42a comprises detachable female couplers 41b and 42b. The ends of the branch supply pipes 7a and the second branch supply pipes 8 are respectively connected to one ends of flexible air hoses 43, 43, and the other ends of the air hoses 43 are connected to the female couplers 41b, 42b is attached.

Therefore, in the above-mentioned modified example, the first and second branch supply pipes 7 and 8 branching from the nitrogen gas supply source provided at the powder / particle discharge site via the supply pipe 5 are provided with the respective gases on the tank 2 side. Since it is detachably connected to the chamber 4 and the discharge pipe 6, the periphery of the tank 2 is further simplified, and the movement of the tank 2 can be performed more smoothly.

It should be noted that the present invention is not limited to the above embodiments and modified examples, but encompasses various other modified examples. For example, in each of the above-described embodiments and modified examples, the switching operation of the first on-off valve 11 necessary for maintaining the pressure in the tank 2 within a predetermined pressure setting range was performed by the control device. Alternatively, when the pressure in the tank exceeds a predetermined pressure range, the communication position may be manually switched to the cutoff position. In this case, the pressure in the tank may be set within the predetermined pressure range. Therefore, the switching operation of the first opening / closing valve required is manually performed, and the control by the control device is not required, so that the configuration of the control device 17 can be further simplified. Moreover, in each of the above embodiments and modifications, each of the on-off valves 11, 13, 14, and 16 is replaced with each of the on-off valves 1
Although the switching operation is performed by supplying or discharging the air to 1, 13, 14, and 16, the on-off valve may be configured to be switched by switching the excitation or demagnetization of the electromagnetic force.

Further, in each of the above-described embodiments and modifications, the hopper portion 3 is provided at two locations before and after the bottom of the tank 2, but the hopper portion may be provided at a single location or at three or more locations below the tank. Of course.

Further, in each of the above embodiments and modifications,
Although the nitrogen gas is supplied from the gas supply source, an air supply source may be provided in the tractor or the like, and the air may be supplied from the air supply source via a supply pipe.

[0035]

As described above, according to the first aspect of the present invention, there is provided the first and second powder discharging devices for discharging the first and second powder particles.
The amount of gas supplied from the flow control valve to the gas chamber via the first branch supply pipe, the amount of gas supplied from the second flow control valve to the hopper via the second branch supply pipe and the discharge pipe, and The pressure in the tank is gradually increased from a predetermined pressure setting range by simply switching the first opening / closing valve to the communicating position or the shutoff position when discharging the particulate material, thereby simplifying the structure of the control means. Can be achieved. In addition, the first opening / closing valve is set by adjusting the gas supply amount by the first and second flow rate control valves to set the pressure within the predetermined pressure range in the tank according to the type of the granular material in the tank and the unloading condition. Can be performed only by the switching operation, and the burden on the operator can be reduced.

According to the second aspect of the present invention, the switching operation between the two positions of the first opening / closing valve necessary for setting the pressure in the tank within a predetermined pressure range is controlled. Since the control is performed by the means, the configuration of the control device can be simplified, and the presence of the operator at the time of discharging the particulates can be completely eliminated, thereby greatly reducing the burden on the operator.

According to the third aspect of the present invention, the switching operation of the first opening / closing valve necessary for setting the pressure in the tank within a predetermined pressure range is performed manually. The structure of the control means can be further simplified.

According to the fourth aspect of the present invention, the first and second branch supply pipes are located closer to the gas chamber and the discharge pipe than the respective on-off valves and the respective flow control valves. Since each part is configured to be removable,
The cost can be reduced by using only one valve set on the gas supply source side, and the valve set on the gas supply source side can be used for a plurality of tanks so that the valve set can be shared. . In addition, the tank can be moved smoothly by making the periphery of the tank of the powder discharging device simple.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a granular material discharging device according to a first embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 according to a second embodiment of the present invention.

FIG. 3 is a diagram corresponding to FIG. 1 according to a modification of the second embodiment.

FIG. 4 is a diagram corresponding to FIG. 1 according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granule discharge device 2 Tank 3 Hopper part 4 Gas chamber 5 Supply pipe 6 Discharge pipe 7 1st branch supply pipe 8 2nd branch supply pipe 11 1st on-off valve 12 1st flow control valve 14 2nd on-off valve 15th 2 Flow control valve 16 Third on-off valve 17 Control device (control means)

Claims (4)

(57) [Claims] 1. A tank for storing powder and granules therein, a hopper provided at at least one location below the tank, a gas chamber provided in the hopper, and one end connected to a gas supply source. A supply pipe, one end of which is open to the hopper, and the other end of which is openably connectable to an external powder transport pipe, and a branch from the other end of the supply pipe to the gas chamber side. A first branch supply pipe having a distal end opening to the gas chamber; and a second branch supply pipe branching from the other end of the supply pipe to the hopper side, and having a distal end opening in the discharge pipe. The gas in the hopper is fluidized by the gas supplied to the gas chamber through the first branch supply pipe, and the inside of the tank is pressurized. In this state, the powder is supplied to the discharge pipe through the second branch supply pipe. The powder in the tank is discharged from the discharge pipe by the gas The first and second branch supply pipes are switched between a communication position for communicating with the first branch supply pipes and a blocking position for interrupting communication with the first branch supply pipes. A first opening / closing valve and a first flow control valve having a variable opening degree for adjusting a supply amount of gas flowing through the first branch supply pipe; and the second branch supply pipe is provided with the second branch. A second on-off valve that switches between a communication position for communicating with the supply pipe and a shutoff position for blocking communication with the second branch supply pipe, and a variable opening degree that adjusts a supply amount of gas flowing through the second branch supply pipe; A second flow control valve is provided, and the discharge pipe is provided with a third opening / closing valve that switches between a communication position for communicating with the discharge pipe and a shutoff position for cutting off communication with the discharge pipe. Switching the first on-off valve to the communicating position when supplying gas to the gas chamber; And control means for controlling the switching of the second on-off valve and the third on-off valve to a communicating position when supplying gas to the discharge pipe. The first and second flow control valves are provided with both of them. The opening degree is adjusted so that the pressure in the tank is gradually increased from a predetermined pressure setting range when discharging the granular material from the tank by the supply amount of the gas from the flow rate control valve, and the first opening / closing is performed. The valve is configured to be switched from the communicating position to the shut-off position when the pressure in the tank exceeds a predetermined pressure range by opening adjustment by the two flow rate adjusting valves, wherein . 2. The powder according to claim 1, wherein the first on-off valve is controlled by a control means to switch from a communicating position to a shut-off position when the pressure in the tank exceeds a predetermined pressure range. Granule discharging device. 3. The granular material according to claim 1, wherein the first on-off valve is manually switched from a communicating position to a shut-off position when the pressure in the tank exceeds a predetermined pressure range. Body ejection device. 4. The first branch supply pipe is configured such that a portion located on the gas chamber side with respect to the first on-off valve and the first flow control valve is removable, and the second branch supply pipe is configured to be removable. The granular material discharge device according to claim 1, wherein the supply pipe is configured such that a portion located on the discharge pipe side with respect to the second on-off valve and the second flow control valve is removable.