JPH08133474A - Forced feed pressure tank, and method and equipment for counting and forcibly feeding powder - Google Patents

Abstract

PURPOSE: To provide a pressure tank for forcibly feeding powder, equipment and a method for counting and forcibly feeding the powder capable of counting and forcibly feeding the powder correctly and in a short time without increasing the forced feed pressure. CONSTITUTION: A forced feed pressure tank is provided with a tank 11, two outlet nozzle 12, a stirring machine 13, a hammering mechanism 14, an inner pressure relief valve 16 and a safety valve 17. After the compressed air is fed from each outlet nozzle 12 to fluidize the powder in the tank 11, the powder in the tank 11 is stirred by the stirring machine 13. The powder in the tank 11 is forcibly fed while the continuous vibration is given to the tank 11 by the hammering mechanism 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-feeding pressure tank for quantitatively feeding powder, granules, pellets and the like to silos and various processing containers, and a powder-quantity feeding device and method.

[0002]

2. Description of the Related Art Many conventional examples have been reported and put into practical use as an apparatus and method for pressure-feeding powder, granules, etc. to a silo or various processing vessels with compressed air. For example, in the construction industry, there are devices and methods for continuously pumping a large amount of cement from a cement loading vehicle to a silo, and in the flour milling industry there are devices and methods for continuously pumping product powder raw materials to silos and various processing containers. In these conventional examples, after the powder is put into a pressure-feeding pressure tank, compressed air is blown into the tank to force-feed the powder from a hopper discharge port of the tank to a designated silo or the like. ing.

[0003]

By the way, in the above-mentioned conventional example, a bridge is formed in the powder in the pressure-feeding pressure tank to form a blow-through portion for air, or a hopper provided under the pressure-feeding pressure tank. The discharge port is clogged with powder, and a considerable amount of powder adheres to the inner wall of the pressure-feeding pressure tank, resulting in fluctuations in the pressure-feeding amount. These phenomena hinder the smooth powder feeding, and there is a problem that it is impossible to accurately feed all the powder put into the pressure feeding pressure tank to the designated silo or various processing containers. Has occurred.

Therefore, there have been proposed techniques such as increasing the pressure for pressure-feeding the powder and periodically varying the pressure of the compressed air. However, increasing the powder feeding pressure requires a large amount of air, which raises the problem of increasing the operating cost of the device. Further, when the compressed air is changed periodically, there is a problem that a complicated control system is required and the powder feeding time becomes long. Further, in the conventional pressure feeding device, there is a problem that the powder is clogged in the tank or the suction hose, or the powder compaction phenomenon occurs, so that the powder feeding amount varies. Therefore, the amount of powder fed into the pressure-feeding pressure tank is not equal to the actual amount of pressure-feeding, which is a bottleneck in improving the accuracy and reliability of the work.

The main objects to be solved by the present invention are as follows. It is a first object of the present invention to provide a pressure-feeding pressure tank capable of quantitatively pressure-feeding powder in a short time, and an apparatus and method for quantitatively feeding an object.

A second object of the present invention is to provide a pressure-feeding pressure tank, a powder-quantitative pressure-feeding apparatus and a method which use a small amount of compressed air.

A third object of the present invention is to provide a pressure-feeding pressure tank in which compressed air to be used has a low pressure, and a powder quantitative feeding device and method.

A fourth object of the present invention is to provide a pressure-feeding pressurizing tank and a powder-quantitative pressure-feeding apparatus and method for applying forced vibration to the wall of the pressure-feeding pressurizing tank during the pressure-feeding to prevent the powder from adhering to the inner wall. It is a thing.

Other objects of the present invention include the specification, drawings,
In particular, it will be clear from the description of the claims.

[0010]

[Means for Solving the Problems] To solve the above-mentioned problems,
The present invention is achieved by adopting the novel characteristic construction means and techniques listed below. That is, the first feature of the tank of the present invention is to provide a tank having a powder inlet with a valve and a powder outlet, a blow-out nozzle for blowing compressed air into the tank, and a powder contained in the tank. A pressurizing and pressurizing tank comprising a stirrer for stirring and a hammer ring mechanism for applying vibration to the tank.

A second feature of the tank of the present invention is that the tank according to the first feature of the tank of the present invention has a powder inlet opening at the center of the top, which has a valve openable and closable vertically at its lower end. , A pressure relief valve and a safety valve are provided on the top, respectively, while a blow-out nozzle is attached to the lower part of the tapered funnel, and a discharge port is opened at the bottom of the lower part to form a hermetically sealed pressurization pressurization. It is a tank.

A third feature of the tank of the present invention is that the agitator according to the first or second feature of the tank of the present invention penetrates through the center of a horizontal rotor shaft rotatably supported on both side walls of the upper part of the tank. A vertical drive shaft is suspended by meshing the upper end with a gear box to be mounted, and a stirrer is fixed to the tip of an arm that branches and extends from the vertical drive shaft along the inclination direction of the lower inner wall surface of the tank. It is a pressure-feeding pressure tank.

A fourth feature of the tank of the present invention is that the required number of hammer ring mechanisms of the first, second or third feature of the tank of the present invention are mounted at predetermined positions on the lower outer wall of the tank. It is a pressure feed pressure tank.

A fifth feature of the tank of the present invention is a pressure-feed pressure tank comprising a plurality of blowing nozzles of the tank according to the first, second, third or fourth feature of the tank of the present invention.

The first feature of the device of the present invention is that a storage tank for storing the powder and a metering device for taking in the powder from the inlet until a preset weight is reached and discharging a certain amount of the powder from the outlet. A hopper, a conveyor that conveys the powder from the storage tank to the weighing hopper, and a blowing nozzle that blows compressed air into a tank having a powder inlet and a powder outlet with a valve are provided in the tank. It is equipped with a stirrer for stirring the contained powder and a pressure-feeding pressure tank provided with a hammer ring mechanism for vibrating the tank, and the discharge port of the weighing hopper and the powder feeding port of the pressure-feeding pressure tank are directly connected. This is a powder quantitative feeding device.

A second feature of the device of the present invention is that the weighing hopper according to the first feature of the device of the present invention is provided with an opening / closing valve at the discharge port directly connected to the powder charging port of the pressure-feeding pressure tank, while the air blowing is performed. In the powder quantitative feeding device, the tip of the nozzle is made to face the upper end of the discharge port, and a required number of hammer ring mechanisms are mounted at predetermined positions on the outer wall.

A third feature of the device of the present invention is that the conveyor according to the first or second feature of the device of the present invention is a horizontal conveyor facing the lower end of the discharge port of the storage tank, and the intake port of the weighing hopper at the upper end. Is a powder quantitative pressure feeding device in which a descending slope conveyor having a lower end facing the same is connected to a powder for continuous and continuous transfer of powder.

The fourth feature of the device of the present invention is that when the amount of powder introduced into the weighing hopper of the conveyor in the first, second or third feature of the device of the present invention reaches a preset weight. The powder quantitative feeding device is provided with an automatic stopping means for stopping its operation.

The first feature of the method of the present invention is that the first step is to introduce the measured powder into a constant atmosphere in which the powder can be sealed and pressurized, and the atmosphere is sealed, and compressed air is blown into the interior. Then, a second step of fluidizing the charged powder and a third step of agitating the powder in the hermetically pressurized atmosphere for a certain period of time by an appropriate mechanical means provided in the pressure feeding pressure tank, A powder quantitative feeding method comprising the step of applying forced vibration to the inner circumference of the closed pressurized atmosphere by the vibrating means and feeding the powder to a specified location outside the closed pressurized atmosphere. is there.

A second feature of the method of the present invention is a powder quantitative feeding method in which the appropriate vibrating means in the first feature of the method of the present invention is mechanical means or electrical means.

[0021]

Since the present invention takes the above-mentioned means and method, the following operation occurs. According to the agitator for the pressure-feeding pressure tank, the powder in the tank can be sufficiently scraped and dispersed, and the generation of bridges and ratholes can be effectively prevented. According to the hammer ring mechanism of the pressure-feeding pressure tank, the tank can be vibrated when the powder is pressure-fed, and the phenomenon that the powder adheres to the inner wall of the tank can be minimized.

When a plurality of blowing nozzles are provided in the pressure-feeding pressure tank, a required amount of compressed air is supplied within a short time.
The powder can be blown into the tank, and the powder can be fluidized in the tank to prevent the powder discharge port from being blocked and the ratholes and bridges from being generated. Further, due to the synergistic effect of the above-mentioned actions, the pressure of the compressed air required for pressure-feeding the powder can be kept low, and the powder can be pressure-fed accurately in a short time.

According to the powder quantitative feeding device, a storage tank,
Since it is equipped with a weighing hopper and a conveyor, powder is automatically conveyed from the storage tank to the weighing hopper, and a preset weight of powder is fed from the weighing hopper into the pressure-feeding pressure tank, and the powder is delivered to the designated location. A system for quantitatively pumping the body can be easily realized.

[0024]

【Example】

(Example of Device) Hereinafter, the present invention will be described in more detail based on an example of the device with reference to the accompanying drawings. FIG. 1 shows the structure of a pressure-feeding device of this device example, and FIG. 2 shows the structure of a pressure-feeding pressure tank of the device. The configuration of the pressure feeding device 1 of this device example is as follows.
As shown in FIG. 1, it comprises a storage tank 2, a first horizontal conveyor 3, a second ascending slope conveyor 4, a weighing hopper 5, a pressure feeding pressure tank 6, and a suction hose 7.

Here, the pumping material is stored in the tank 2, and the pumping material is cut out to the first horizontal conveyor 3 by opening and closing the outlet of the storage tank 2. In the device of this device example, silica fume powder, which is a concrete admixture, was used as the material for quantitatively feeding.

The first horizontal conveyor 3 serves to convey the silica fame powder cut out from the storage tank 2 to the second ascending slope conveyor. The second ascending slope conveyor 4 can control its operating speed, and the first horizontal conveyor 3
The silica fume powder, which is sequentially sent from the above, functions to be conveyed into the weighing hopper 5 through the dropping port 4a. The second ascending slope conveyor 4 has a function of stopping the operation when the amount of the powder put into the weighing hopper 5 reaches a preset weight.

The weighing hopper 5 has a drop port 4 at the top thereof.
An intake port 5a for taking in the powder from a is provided, and a discharge port 5b having an opening / closing valve 8 is provided below the intake port 5a. Further, the weighing hopper 5 is provided with a tip 9a of an air blowing nozzle 9 which fluidizes the powder and facilitates discharging, facing the discharge port 5a, and further, a hammer ring mechanism for vertically vibrating the measuring hopper 5 itself. 10 are provided. In the figure, 9b is an air blowing nozzle opening / closing solenoid valve.

As a result, the discharge port 5b of the weighing hopper 5 is
When the opening / closing valve 8 of is opened by the switch 8a, the contained powder is vibrated by the hammer ring mechanism 10 and
It is fluidized by the air from the air blowing nozzle 9 and put into the lower pressure-feeding pressure tank 6.

As shown in FIG. 2, the pressure-feeding pressure tank 6 which constitutes the pressure-feeding device 1 and which is an embodiment of the present invention, has a top portion 11a.
A tank 11 in which a powder charging port 6a is projectingly opened in the center and a lower part 11b is formed in a tapered funnel shape, two blowout nozzles 12, an agitator 13, a hammer ring mechanism 14, and a top part on both sides of the lower part 10b. An internal pressure relief valve 16 and a safety valve 17 are provided near the shoulder of 10a, respectively. In the figure, 1
Reference numeral 2a is an air blowing nozzle opening / closing solenoid valve.

A valve 15 is attached to the tank 11 so that a valve 15 can be opened and closed and moved up and down so as to face the lower end.
A conical hopper-shaped lower part 11b is provided with a powder discharge port 6b opening at the bottom bottom. Powder charging port 6a
The valve 15 is a cone-type valve that is opened and closed vertically by an electromagnetic valve, and the inside of the tank 11 is hermetically closed so that the internal pressure can be increased by blowing compressed air when closed.

The blowing nozzle 12 functions to blow compressed air into the tank 11 from the outside in order to increase the internal pressure of the tank 11. In this embodiment, the blowout nozzle 12
Although it is configured to be attached by penetrating to the lower portion 11b of the tank 11 at 17 positions, the present invention is not limited to this, and more blowing nozzles 12 may be provided.

The stirrer 13 functions to stir the powder charged in the tank 11 and effectively prevent the generation of bridges and ratholes due to the powder. In this embodiment, the horizontal rotor shaft 13b of the motor is connected to the upper part 1 of the tank 11.
1c both ends are rotatably supported by the left and right seal bearings 13a provided on both sides, and the horizontal rotor shaft 13 is supported by a gear box 13c which is mounted through the center of the rotor shaft 11b.
A structure in which the rotation of b is converted into the rotation of the stirring bar 13e integrated with the vertical drive shaft 13d is adopted. The stirring bar 13e is fixed to the tip of an arm 13f branched and extended from the vertical drive shaft 13d so as to face along the inclination direction of the inner wall surface of the lower portion 11b.

The hammer ring mechanism 14 is provided outside the lower portion 10b of the tank 11 and has a function of continuously striking the lower portion 11b of the tank 11 to vibrate it when the powder is fed under pressure. This can minimize the phenomenon that the powder itself adheres to the inner wall of the tank 11 when the powder is pressure-fed.

The internal pressure release valve 16 is provided to release the compressed air remaining in the tank 11 after the powder pressure feeding operation, and the safety valve 17 is provided to prevent the tank 11 from being destroyed by high pressure. And, the powder discharge port 6b of the pressure-feeding pressure tank 6 and the plant mixer kneading chamber for producing fresh concrete on the upper floor of the batcher plant (not shown)
It is connected by a suction hose 7.

(Example of Method) Next, a method for quantitatively pressure-feeding the silica fame powder of the present invention using the above-described pressure-feeding device 1 will be described. First, the powder stored in the tank 2 is sent to the weighing hopper 5 by the first and second conveyors 3 and 4. In the weighing hopper 5, when the contained powder reaches a predetermined weight, the opening / closing valve 8 of the discharge port is opened, the hammer ring mechanism 10 is operated, and air is blown from the air blowing nozzle 9. As a result, the powder weighed to a predetermined weight in the weighing hopper 5 is put into the pressure-feeding pressure tank 6 in which the closed pressurized atmosphere A can be freely formed (first step).

Then, after the powder in the weighing hopper 5 is put into the pressure-feeding pressure tank 6, the valve 15 of the pressure-feeding pressure tank 6 is closed to make the inside of the tank 11 airtight. Next, compressed air is supplied from each of the blowout nozzles 12 to the tank 1.
1, and the inside of the tank 11 is brought into a closed pressurized atmosphere A to fluidize the charged powder (second step). After fluidizing the powder in the tank 11 in this way, the stirrer 1
3 is operated to stir the powder in the closed pressurized atmosphere A in the tank 11 to suppress the generation of bridges and ratholes due to the powder (third step).

Then, the hammer ring mechanism 14 is operated to continuously hit the tank 11 to apply a forced vibration to the lower inner circumference of the closed pressurized atmosphere A, and the powder in the tank 11 is pressure-fed. The powder is discharged through the powder discharge port 6b and the suction hose 8 and continuously fed under pressure outside the closed pressurized atmosphere A to the plant mixer kneading chamber for the production of fresh concrete in the subsequent stage (fourth step).
Process).

For the end of the continuous powder pressure feeding operation, a timer device that is operated simultaneously with the opening operation of the valve 15 of the pressure feeding pressure tank 6 and stops the operation of the hammer ring mechanism 14 after a predetermined time has passed, or Also, a control system is provided which is provided with a sensor for detecting the internal pressure of the pressure-feed pressurizing tank 6 and stops the operation of the hammer ring mechanism 14 when the internal pressure falls below a predetermined value. In this example of the method, the hammer ring mechanism 14 was used exclusively as a means for vibrating the inner circumference of the lower portion of the closed pressurized atmosphere A. However, the present invention is not limited to this, and the ultrasonic vibration or the pressure feeding pressure tank 6 without tapping sound is used. The resonance may be electrically excited by the natural frequency of.

According to this example of the apparatus, 40 kg of silica fame powder charged from the weighing hopper 5 into the pressure-feeding pressure tank 6 is, for example, 1.6 kg per second from the powder discharge port 6b.
It was possible to discharge continuously with almost no change at the rate of (the time required to discharge all powder is 25
Seconds).

(Comparative Example) Next, in order to compare with an example of a general conventional pressure feeding method, the agitator 13 and the hammer ring mechanism 14 of this apparatus example are stopped, and the method is carried out from each blowing nozzle 12. It was decided to try a test in which compressed air similar to the example was supplied into the tank 11 and the silica fame powder was pumped by the conventional method example.

As a result, in the conventional pressure feeding method example, the amount of powder discharged from the powder discharge port was extremely reduced, and constant pressure feeding was not possible. Therefore, if the pressure-feeding pressure tank 6 of the present invention and the example of the method using the same are adopted, the powder can be accurately and quantitatively pressure-fed without increasing the pressure-feeding pressure.

(Test Example) In the above examples, silica fume, which is a concrete admixture, was used as the pressure-feeding powder.
Further, in order to confirm the effect of this example, it was decided to carry out a test of continuously feeding other pressure-fed powders to the kneading mixer chamber using the same apparatus. In Test 1, Test 2, and Test 3, fly ash of concrete admixture, blast furnace slag fine powder, and crushed powder of agricultural products were used as the pressure-feed powder.

(Test 1) As a result of the main test 1, 40 kg of fly ash powder charged from the weighing hopper 5 into the pressure-feeding pressure tank 6 is 1.6 kg per second from the powder discharge port 6b.
It was possible to discharge continuously with almost no change at the rate of (the time required to discharge all powder is 25
Seconds).

(Test 2) As a result of the main test 2, the 40 kg of blast furnace slag fine powder charged from the weighing hopper 5 into the pressure-feeding pressure tank 6 was almost always discharged from the powder discharge port 6b at a rate of 1.6 kg per second. It was possible to discharge continuously without fluctuation (the time required to discharge all powder was 25
Seconds).

(Test 3) As a result of this test 3, 50 kg of crushed powdered agricultural products put into the pressure-feeding pressure tank 6 from the weighing hopper 5 was 2 kg per second from the powder discharge port 6b, and there was almost no change. It was possible to discharge continuously (the time required to discharge all powder was 25 seconds).

From the above results of this test example, various powders can be accurately and quantitatively fed in a short time according to the pressure feeding / pressurizing tank, the powder quantitative feeding device and the powder quantitative feeding method of this embodiment. Can be confirmed. Therefore, according to the present embodiment, it is possible to improve the reliability of the powder pressure feeding work, so that it is possible to prevent the fluctuation of the pressure feeding amount and to stabilize the production work.

[0047]

As described above, according to the apparatus of the present invention and the method invention using the same, the pressure-feeding pressure tank is provided with the agitator, the hammer ring mechanism and the blowing nozzle. The powder is less likely to be clogged in the pressure-feeding pressure tank, and the powder can be accurately and quantitatively pressure-fed without increasing the pressure-feeding pressure.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a pressure feeding device according to an example of the present invention.

FIG. 2 is a schematic view showing a configuration of a pressure-feeding pressure tank of the same pressure-feeding device.

[Explanation of symbols]

 A ... Hermetically pressurized atmosphere 1 ... Pressure feeding device 2 ... Tank 3 ... Horizontal conveyor 4 ... Ascending slope conveyor 4a ... Falling port 5 ... Weighing hopper 5a ... Intake port 5b ... Discharge port 6 ... Pressure feeding pressure tank 6a ... Powder input port 6b ... powder discharge port 7 ... suction hose 8,12 ... blowing nozzle 9 ... air blowing nozzle 9a ... tip 9b ... air blowing nozzle opening / closing solenoid valve 10 ... hammer ring mechanism 11 ... tank 11a ... top 11b ... bottom 11c ... upper 13 ... Stirrer 13a ... Seal bearing 13b ... Horizontal rotor shaft 13c ... Gear box 13d ... Vertical drive shaft 13e ... Stirring bar 13f ... Arm 14 ... Hammer ring mechanism 15 ... Valve 16 ... Internal pressure relief valve 17 ... Safety valve

Claims (11)

[Claims] 1. A tank having a powder inlet having a valve and a powder outlet, a blow-out nozzle for blowing compressed air into the tank, a stirrer for stirring the powder contained in the tank, A pressurizing and pressurizing tank comprising a hammer ring mechanism for giving vibration to the tank. 2. A tank is provided with an internal pressure relief valve and a safety valve on the top, while a powder inlet having a valve openable and closable at the lower end is opened at the center of the top. The pressure-feed pressurization tank according to claim 1, wherein a blow-out nozzle is attached to the lower part of the funnel shape, and a discharge port is opened at the bottom end of the lower part so as to be hermetically sealed. 3. A stirrer, wherein a vertical drive shaft is suspended while a top end is meshed with a gear box which is mounted through the center of a horizontal rotor shaft rotatably supported on both side walls of an upper portion of the tank, while the vertical drive shaft is suspended. The pressure-feeding pressurized tank according to claim 1 or 2, wherein an agitator facing the lower inner wall surface of the tank is fixedly provided at the tip of an arm that branches and extends from the tank. 4. The pressurization and pressurization tank according to claim 1, wherein the required number of hammer ring mechanisms are mounted at predetermined locations on the lower outer wall of the tank, respectively. 5. The pressurizing / pressurizing tank according to claim 1, wherein the blowing nozzle of the tank has a plurality of nozzles. 6. A storage tank for storing the powder, a weighing hopper for taking in the powder from the intake port until a preset weight is reached, and discharging a certain amount of the powder from the discharge port, and the storage tank for storing the powder. A conveyor for transferring powder to the weighing hopper, and a blow-out nozzle for blowing compressed air into a tank having a powder inlet and a powder outlet with valves are provided.
An agitator for agitating the powder contained in the tank and a pressure feeding pressure tank provided with a hammer ring mechanism for vibrating the tank are provided, and the discharge port of the weighing hopper and the powder feeding of the pressure feeding pressure tank. A powder quantitative feeding device characterized by being directly connected to the mouth. 7. The weighing hopper is provided with an opening / closing valve at the discharge port directly connected to the powder feeding port of the pressurizing / pressurizing tank, while making the tip of the air blowing nozzle face the upper end of the discharging port. 7. The powder quantitative feeding device according to claim 6, wherein a hammer ring mechanism is attached to each of the predetermined positions of the. 8. The conveyor is a horizontal conveyor facing the lower end of the discharge port of the storage tank, and an ascending inclined conveyor having a drop port facing the lower end in the intake of the weighing hopper at the upper end. The powder quantitative feeding device according to claim 6 or 7, characterized in that the powder quantitative feeding device is freely connected. 9. The conveyor is provided with an automatic stop means for stopping the operation of the conveyor when the amount of the powder put into the weighing hopper reaches a preset weight. The powder quantitative feeding device according to item 8. 10. A first step of introducing the measured powder into a constant atmosphere which can be hermetically sealed and pressurized, and the atmosphere is hermetically sealed, and compressed air is blown into the interior of the atmosphere to remove the powder already introduced. The second step of fluidizing, the third step of agitating the powder in the hermetically pressurized atmosphere for a certain period of time by an appropriate mechanical means provided in the pressure-feeding pressure tank, and the hermetic pressurization by an appropriate vibrating means. And a fourth step of feeding the powder to a designated place outside the closed pressurized atmosphere while forcibly vibrating the inner circumference of the atmosphere. 11. The powder quantitative feeding method according to claim 10, wherein the vibrating means is a mechanical means or an electrical means as appropriate.