JPH0435305Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a means for transporting powder and granules such as cement or soybeans in a tank, and the powder and granules in the tank are stored in a facility silo or the like at a delivery location. The present invention relates to an automatic pressure-feeding and discharging device for a powder transport vehicle that automatically controls the discharge of powder and granular materials when unloading.

[Conventional technology]

As a conventional powder transport vehicle of this kind, the Jikko 57
Those disclosed in Publication No. 4029 or Publication No. 42898 of 1987 are known. In other words, in order to drop the transported powder into the remote or high-place charging port of the equipment silo, the internal pressure of the transport tank must be increased, and at the same time, air must be mixed with the powder to fluidize it. Therefore, a method is adopted in which the liquid is fed under pressure from the tank discharge pipe through the transport pipe.

In this case, the appropriate discharge conditions for the forced discharge work using the powder transport vehicle vary greatly depending on the properties of the powder, the amount of air supplied, and the piping size and layout of the equipment. It varies depending on the amount of powder remaining in the tank and air humidity.

Therefore, in conventional work of this kind, while visually checking the internal pressure of the tank or transport pipe with a pressure gauge, the amount of air fed into the tank and the air entering the solid-gas mixture section immediately after the discharge valve installed at the discharge port are determined. An operator manually operated valves provided in both air pipes to adjust the ratio between the amount and the amount while checking the flow of the powder and granules.

In addition to adjusting the amount of air, the opening degree of the discharge valve and the taping angle of a tank having a taping function have also been manually adjusted.

[Problem that the invention attempts to solve]

Therefore, the work of discharging the powder and granular material managed by the above-mentioned adjustment operation requires a skilled worker, and the discharging ability varies depending on the technical ability of the worker. In addition, it was necessary to supervise the worker during the 20 to 45 minute discharge operation.

Therefore, the present invention aims to automate the work of pumping and discharging equipment silos using transport media such as air in powder and granule transport vehicles, except for the work of connecting the discharge pipes to the equipment side, making the discharge work unmanned and always optimal. The purpose of this project is to develop a device that can automatically pump and discharge powder and granular materials under suitable discharge conditions and that can be operated efficiently.

[Means for solving problems]

In order to achieve this purpose, the present invention provides a mechanism for pumping and discharging powder and granules in a transportation tank to a facility silo or the like using a transportation medium such as pressurized air.
A valve device that is equipped with a controller that recognizes a pattern of pressure changes in the tank that provides optimal discharge conditions, and that controls the feeding of the transport medium into the tank, and a discharge valve device that controls the opening and closing of the discharge pipe in the tank. And a discharge condition setting device such as a valve device that controls the feeding of the transport medium to the solid-gas mixing part in the discharge pipe is set to the previously recognized pattern by the controller based on the pressure information from the tank internal pressure sensor detected during operation. An automatic pressurization and discharge device for a powder transport vehicle is proposed, which is configured to automatically control in a direction to correct the difference between the comparisons.

In this case, it is effective to modify the control by the controller using information on the level of powder and granular material in the tank, information on the discharge flow rate, information on the total weight of the tank, etc., and set the taping angle of the tank on the discharge condition setting device. It is also possible to include a controlling device.

[Effect]

FIG. 3 shows a simulated change in the internal pressure of the tank when the powder and granular material is pumped and discharged stably and efficiently from the granular material transport tank. In other words, if we take the pressure inside the tank on the vertical axis with respect to the time axis on the horizontal axis, air is pumped into the sealed tank at t ₀ at the start of the discharge operation after transportation, and the pressure is kept within the tank's allowable pressure range. Increase pressure. When the discharge valve is opened at time t ₁ when the tank internal pressure reaches a sufficient pressure, the powder and granules are temporarily discharged at high speed due to the high tank internal pressure and the low load on the transport pipe, which is still in the initial hollow state, and the tank The internal pressure drops rapidly, but as the discharge load increases due to the gradual increase in flow path resistance in the transport pipe due to the injected powder and granules, and the continued supply pressure is balanced, the tank internal pressure stabilizes. The pressure-feeding and discharging operation at a constant velocity continues until the powder and granules in the tank are almost completely gone (time t ₂ ). At the final stage of this forced discharge,
As the powder and granules are not sufficiently supplied to the discharge port and a solid-gas mixture containing a large amount of air is sent out, the internal pressure of the tank gradually decreases and finally reaches the external pressure at time t ₃ , ending the work. .

This change in tank internal pressure is sampled in the controller as an optimal pattern, and the tank internal pressure during actual operation is successively compared with this optimal pattern, and the discharge condition setting device is designed to correct the differences from time to time. Controls the taping angle when the air supply valve device into the tank, the discharge valve device, the air supply valve device to the solid-air mixing part in the discharge pipe, and the transport vehicle are equipped with a taping function.

As a result, as shown in FIG. 4, in the partial region A where the curve L showing the uncontrolled tank internal pressure during operation exceeds the curve L showing the optimal discharge condition pattern (tank internal pressure rise), the tank By narrowing the opening of the air supply valve device to the inside of the tank to reduce the amount of transport medium sent into the tank, and at the same time narrowing the opening of the discharge valve and widening the opening of the air supply valve device to the solid-air mixing section, Measure the reduction of the excess pressure in the tank, prevent clogging due to excess pressure in the discharge pipe and transportation pipe due to powder and granules being transported, and wait for a return to stable discharge operation. It works like this. In addition, in the partial region B where the tank internal pressure is lower than the curve L, the opening degree control of each device is performed in the opposite direction to the above control to recover the previously decreased amount of powder and granular material discharge and to ensure stable discharge operation. It functions to wait for the return to .

The actual opening control amount for this discharge condition setting device is determined to prevent unforeseen situations such as the amount of powder remaining in the tank and clogging at the discharge port, or unevenness of the powder and granules in the tank. Taking this into account, it is effective to determine this, but in determining this control amount, information on the level of powder and granular material in the tank (detection of unevenness of powder and granular material in the tank), discharge flow rate information (discharge port, etc.) clogging detection) and tank total weight information (detection of remaining amount of powder and granular material in the tank) are effective.

As a result, the discharge work that is automatically controlled to the optimal pattern can be shortened by t ₃ −t ₂ hours compared to the end time t ₃ of the work without control as shown in Figure 4. This enables unmanned work that does not require operator supervision during this time.

Next, a preferred embodiment of the present invention will be described.

〔Example〕

Fig. 1 is a configuration diagram of a control mechanism showing an embodiment of the present invention.A transport tank 1 has an air slide belt 2 disposed at the bottom of the tank for spouting a transport medium such as compressed air. , the granular material 4 received from the upper input port 3 is transferred to the discharge port 5 at the rear lower part of the tank.
It is designed so that it can be discharged from the

Further, the tank 1 itself is pivotally supported at its rear outer end so that it can be tapped by expanding and contracting a tilt cylinder 6 disposed between the front of the tank and a support base.

A discharge valve 7 is provided at the discharge pipe port 5, and a solid-gas mixing section 8 for mixing the powder and granular material 4 with compressed air is provided in the pipe immediately after the discharge valve 7. It is designed to be connected to the receiving pipe 10 of.

Inside the tank 1, there are a plurality of level sensors 11, 11 for detecting the bulk of the contained powder and granular material 4.
are placed at appropriate positions, and a flow rate sensor 12 is installed inside the discharge pipe, while weight sensors 13 are placed at the tank pivot portion and the base of the tilt cylinder 6, respectively, to detect the total weight of the tank 1. In addition, a pressure sensor 14 for detecting the internal pressure of the tank and a pressure sensor 15 for supplying air to the solid-air mixing section 8 are also provided.

The situation detection information from each of these sensors is input to the controller 16. The controller 16 is made to recognize in advance a pressure change pattern assuming the tank internal pressure that is the optimal discharge condition, and based on the tank internal pressure information from the internal pressure sensor 14 of the previous situation detection information, the tank internal pressure at that time is adjusted. The internal pressure is compared with the recognition pattern, and a control signal resulting from the comparison is output.

One of the exhaust condition setting devices that receives this control signal is an air compressor 19 that is driven by a motor 17 and sucks air through an air filter 18.
Electric valves 20 and 21 are respectively provided in two air supply circuits receiving compressed air from the
The other one is electromagnetic valves 23 and 24 provided in two hydraulic circuits that receive hydraulic oil from the hydraulic power unit 22, respectively.

The electric valves 20 and 21 control the amount of air supplied to the tank 1 and the solid-air mixing section 8, respectively, and the electromagnetic valves 23 and 24 control the opening degree of the discharge valve 7 using the operating cylinder 25. Moreover, the expansion and contraction of the tilt cylinder 6 (the tilting angle in the tank 1) is controlled. FIG. 2 shows each input element and each output element for the above control in this controller 16.

In addition, in each control of these discharge condition setting devices, the direction of control is determined based on the tank internal pressure information from the pressure sensor 14, and the control amount at each time is comprehensively corrected by other input elements. Based on this determination, control is performed so that the tank internal pressure approaches the optimal discharge condition pattern. In addition to the above-mentioned air, various compressible fluids can be used as the transport medium for fluidizing the granular material and pumping the granular material during discharge.

[Effect of idea]

As described above, according to the device of the present invention, in a mechanism for pumping and discharging powder and granules in a transportation tank to a facility silo, etc. using a transport medium such as pressurized air, the pressure change that makes the tank internal pressure the optimal discharge condition is achieved. A valve device that causes a controller to recognize the pattern in advance, and sequentially compares changes in the internal pressure of the tank during operation with the previous pattern, and controls the feeding of transport fluid into the tank based on the results. Each discharge condition setting device, such as the discharge valve device that controls the opening and closing of the discharge pipe in the tank and the valve device that controls the feeding of the transport medium to the solid-gas mixing section, is automatically set so that the tank internal pressure approaches the optimal pattern. Since the system can be controlled visually, the powder and granules can be efficiently and stably pumped and discharged in a state that is closest to the optimum discharge condition without requiring operator monitoring during such discharge work. As a result, work efficiency can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a mechanism for pumping and discharging powder and granular material equipped with the device of the present invention, Fig. 2 is a block diagram illustrating the control elements of the controller in the device of the present invention, and Fig. 3 is a pressure-feeding mechanism. FIG. 4 is a pressure characteristic diagram showing the optimum conditions for the tank internal pressure at the time of discharge. Similarly, FIG. 4 is a characteristic diagram showing the pressure characteristics under the optimum conditions and the tank internal pressure characteristics under uncontrolled operation. 1...tank, 4...powder, 5...discharge pipe port, 6...tilt cylinder, 7...discharge valve, 8
... solid-gas mixing section, 9 ... equipment silo, 11 ... level sensor, 12 ... flow rate sensor, 13 ...
Weight sensor, 14, 15...Pressure sensor, 1
6... Controller, 20, 21... Electric valve, 23, 24... Solenoid valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pattern of pressure changes in the tank that provides the optimal discharge conditions in a mechanism that pumps and discharges powder and granules in a transportation tank to a facility silo, etc. using a transport medium such as pressurized air. A valve device that controls the feeding of the transport medium into the tank, a discharge valve device that controls the opening and closing of the discharge pipe in the tank, and a transport medium to the solid-gas mixture part of the discharge pipe, which is equipped with a controller that recognizes the The controller automatically controls the discharge condition setting device, such as a valve installed to control the feeding of the tank, to correct the difference compared to the previous recognition pattern based on pressure information from the tank internal pressure sensor detected during operation. An automatic compression and discharge device for a powder transport vehicle, characterized in that it is configured as follows. (2) Claim 1 of the utility model registration in which the control conditions for correcting the difference are modified using information on the level of powder and granular material in the tank, information on the discharge flow rate, information on the total weight of the tank, etc. An automatic compression discharge device for a powder and granular material transport vehicle as described in 2. (3) The automatic compression discharge device for a powder transport vehicle according to claim 1, wherein the discharge condition setting device includes a device for controlling the taping angle of the tank.