JP3628535B2 - Powder filling method for powder transport tank truck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for filling powder into tank lorry over carrying powder having a low bulk specific gravity.
[0002]
[Prior art]
It is well known that tank trucks may be used when carrying a large amount of powder. Since powder is solid in itself, it is difficult to pump it down like a liquid, and a screw conveyor, trough conveyor, or a chute from a hopper is used to transfer the powder. Then, a means such as dropping is used.
[0003]
In the case of a relatively heavy powder such as cement or soda ash, it can be loaded into a tank lorry by the above means. However, the bulk specific gravity is very small, for example, the bulk specific gravity is 0.07 to 0.3 g / ml. In order to improve the working environment, it is difficult to efficiently transfer powders such as white carbon, and dust is likely to stand up, and the working environment is deteriorated. As a means to transfer the force.
[0004]
However, a powder containing a large amount of gas and fluidized has a very low bulk specific gravity, and therefore, when transported by a tank lorry, the weight that is a substantial transport amount is small for a large volume.
[0005]
Therefore, devices described in Japanese Utility Model Publication Nos. 64-55140 and 2-83297 are proposed.
[0006]
The former arranges a cylindrical tank on the vehicle body along the vehicle body, attaches a tank tilting mechanism for tilting the tank backward, and forms a discharge port and an introduction port for fine powder at the rear of the tank, A fine powder transport vehicle with a deaeration path connected to the upper front and rear ends of the tank via a built-in filter that prevents the passage of fine powder, and an air introduction path connected to the lower part of the tank at regular intervals in the tank longitudinal direction. In the latter, inside the container having an internal space for filling powder that can be sealed against the outside air, at least a narrow gap from the inner surface of the container from the lower half of the side surface to the bottom surface is provided between the plate filters. A tank lorry for conveying powder is proposed in which a ventilation chamber partitioned from the space is formed and this ventilation chamber is connected to an external exhaust means and an air supply means.
[0007]
In these conventional methods, powder having a small bulk specific gravity is fluidized with gas, especially air, transferred, and supplied to a tank. Proposes a means to increase the bulk specific gravity and to load in large quantities and to reverse the flow when discharging from the tank, and also to incline the tank or provide vibration to promote discharge It is.
[0008]
That is, in Japanese Utility Model Publication No. 64-55140, exhaust ports are provided at the front and rear of the tank, the flow of air supplied to the tank is distributed to the front and rear of the tank, and the powder carried thereby is uniform over the entire length of the tank. In this way, it is possible to prevent the clogging of the filter near the exhaust port and the clogging of the filter, and to fill with higher pressure. Further, a technical idea is shown in which air is re-supplied from the lower part of the tank at the time of discharge to fluidize the powder, and the tank is tilted backward to flow out from the rear outlet. Further, JP-A-2-83297 and the like further have an exhaust surface over a wide range on the floor and side surfaces of the tank, and positively deaerate air in the powder to increase the bulk specific gravity of the powder. Increasing the size is disclosed.
[0009]
[Problems to be solved by the invention]
Each of the conventional means described above is an effective means, and each technical idea and means can be adopted in the present invention. However, the bulk specific gravity of the powder is further increased, and a larger loading weight is obtained. From the economic point of view, rapid discharge means is also desired.
[0010]
Accordingly, an object of the present invention is to obtain a means capable of filling a powder having a small bulk specific gravity at a higher density and quickly discharging the powder. In order to achieve this purpose, the conventional means have been intensively studied. In a horizontally long tank such as a tank lorry, it is certainly effective to load uniformly over the entire length. The gas entrained in the tank does not escape sufficiently, and a sufficient effect cannot be obtained unless complicated means and facilities such as repeated depressurization, deaeration and aerodynamic supply are used when the tank is loaded. In addition, the means for degassing from the powder accumulated by entraining air in the tank during loading starts to increase the bulk density from the powder near the filter, so the air permeability gradually decreases, the pressure resistance increases, It has been found that there is a problem that the bulk density hardly increases as the distance from the filter increases.
[0011]
Furthermore, the powder is discharged more easily, as the bulk density is increased, it becomes difficult to discharge due to lack of fluidity, and so-called shelf suspension is likely to occur.
[0012]
Therefore, the present invention firstly solves the problem of how to uniformly degas the gas entrained in the powder loaded on the tank lorry, and quickly fluidizes the powder at the time of discharge without causing shelf hanging. It solves the problem of discharging.
[0013]
[Means for Solving the Problems]
The present invention is for conveying a powder having a bulk specific gravity of 0.07 to 0.3 g / ml, and is a gas composed of a porous body made of fine pores through which powder does not permeate almost the entire bottom surface of a tank. It has a gasation system consisting of blowout holes, an exhaust port with a filter that does not allow powder to permeate on the upper surface of the tank head, a powder supply port on the tank head, and a powder on the lower end of the tail. When the powder is transported by a powder transporting tank lorry having a body discharge port and having a lifting mechanism for lifting and tilting the head with the vicinity of the tail as a fulcrum, the powder to the tank When loading, the tank head is lifted by the lifting mechanism, the tank is tilted, and the powder is filled from the powder supply port of the tank head. Is the method.
[0014]
As a more preferred embodiment, a shape that forms a discharge chute over almost the entire rear surface of the tank and prevents shelves around the outlet is also employed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a powder truck having a small bulk specific gravity, such as white carbon or fumed silica, that is, a tank truck for carrying a powder having a bulk specific gravity of 0.07 to 0.3 g / ml measured according to JIS K6220, The characteristic structure is composed of a porous body having a large number of micropores for blowing gas over almost the entire bottom surface (also referred to as a floor surface) of the tank. The fine pores are fine pores that do not allow the powder to permeate, for example, pores having a pore diameter of about 0.01 to 0.1 μm, such as a metal sintered body or canvas cloth, and are hereinafter also referred to as filters. There is a gas passage for supplying or degassing gas on the lower surface of the filter, and there is a pipe for connecting to a gas container (pressure tank), a compressor and / or a suction device for supplying gas outside the tank. It has been subjected. These gas supply / discharge means are collectively referred to as a gasation system. Of course, a pressure tank, a compressor, a suction device, or the like can be attached to the tank lorry, but is generally installed on the silo side of each destination as a fixed facility.
[0016]
In the gasation system, the gas passage can be a single chamber over the entire tank floor, but it is divided into multiple chambers in the vertical and / or horizontal direction, and the amount of gas blown out for each chamber A structure that can be adjusted is preferred.
[0017]
In addition, an exhaust port provided with a filter that does not allow powder to permeate is provided on the upper surface of the tank head, that is, the end near the tank lorry cab. The filter is a metal sintered body, canvas cloth, or the like, and may be the same type as the porous body used on the floor surface, but may have a lower strength. Further, the exhaust port can be provided with a forced exhaust means or a connection fitting to the forced exhaust means, which is often preferable. Further, the greatest feature of the present invention is that it has a powder supply port on the head of the tank, generally the upper surface of the head. The supply port itself may be a general receiving port used conventionally. In addition, the tail of the tank, that is, the lower end of the rear side of the tank lorry has a powder discharge port.
[0018]
In the present invention, when powder is loaded on the tank lorry, the head of the tank lorry is lifted, the tank is tilted, and the powder is supplied from the supply port of the head. At that time, the gas passage of the gasation system is divided into a plurality of chambers in the lateral direction, so that it is effective to degas the gas entrained in the powder from the passage near the tail. In the present invention, by supplying the powder by inclining the tank, the gas entrained by the weight of the powder is degassed. The tank shape of the tank lorry is inevitably a vertically long shape. By setting up this, the depth of the powder load increases remarkably, and the gas entrained by its own weight is released, so that it can be effectively degassed. Thus, it is possible to load at least 10% more on the tank lorry than when the powder is degassed from the side or bottom of the loaded powder without setting up the tank. In particular, in the present invention, when combined with degassing from the bottom and side surfaces of the tank, it is possible to load 20% or more.
[0019]
In the present invention, an elevating mechanism for inclining the tank is essential. Such a mechanism itself is not different from a lifting mechanism for a dump truck bed. In general, the inclination angle of the tank is in the range of 20 to 45 degrees, and can be used as long as it can form an angle of about 20 to 30 degrees in consideration of the cost of the mechanical equipment constituting the lifting mechanism.
[0020]
In the present invention, when discharging the loaded powder, the powder discharge port at the rear part is opened, gas is introduced into the powder by a gasation system, and the powder is fluidized. In that case, it is effective to incline the tank, and it is also effective in some cases to vibrate the tank. A conventionally known vibration means may be used.
[0021]
In the present invention, the powder shelf hanging phenomenon can be reduced as much as possible by the aspect in which the lower end of the tail portion of the tank is used as the discharge port over the entire width.
[0022]
FIG. 1 is a side view of a powder transport tank lorry according to the present invention, where 1 is a tank portion. The tank has a powder supply port 2 and exhaust ports 3 and 3 '. However, although there is no need for the rear exhaust port, it is more convenient to have 3 'when the amount of powder to be loaded is small. Reference numeral 4 denotes a manhole, and 5 denotes a powder discharge port. Reference numeral 6 denotes a gas passage of the gasation system, and 7 is a pipe for supplying gas to the passage. The pipe is not shown, but a connection fitting to the gas pressure tank is attached.
[0023]
The gas passages in the gasation system are preferably divided in the vertical and horizontal directions, and the piping is laid in the respective chambers, and a valve and a valve operating system for controlling the gas supply amount to the respective chambers are provided. It is particularly preferable to attach the same.
[0024]
Reference numeral 11 denotes an elevating mechanism for inclining the tank.
[0025]
FIG. 2 is a rear view of the tank lorry of FIG. In the figure, 6 is a gas passage, 8 is a filter constituting the floor surface, and 9 is a partition plate that divides the gas passage in the vertical direction. Since the powder discharge port 5 is required to be a hopper having an angle of repose or more, it is common to provide a discharge hopper at one location on the lower end of the tail portion. However, as shown in FIG. For example, a method is used in which a plurality of hoppers are installed over the entire width of the lower end, and these are sucked and conveyed in the direction of the arrow, for example, by the pneumatic transfer tube 10 or the like. Of course, a plurality of hoppers are provided with valves (not shown), and the powder can be discharged by switching appropriately.
[0026]
Hereinafter, the present invention will be described with reference to specific examples.
[0027]
As shown in FIG. 1, a tank lorry for carrying white carbon is taken as an example. In a tank lorry with a total length of about 13m, a total width of about 2.5m, a tank capacity of 70m ³ and a maximum loading capacity of 12 tons, a manhole with a diameter of 0.5m at the top and a Tetron canvas filtration area of 1m at the tank head ^{2 has} an air outlet with a filter and a powder supply port with an inner diameter of 12 cm. The tank floor has gas passages divided into two in total of two in the front, rear, left and right, and the canvas is stretched thereon. Each chamber of the gas passage is piped from the outside, and a fitting is attached to the end of the chamber, connected to a fixed gas (air) supply facility outside the tank lorry, and gas is sent into the tank for loading. The formed powder is fluidized.
[0028]
The discharge port is provided with three hoppers at the lower end of the tail and is opened and closed with a butterfly valve. Each hopper can transfer the discharged powder to a destination tank by a discharge pipe with aeration. With this tank lorry, white carbon with an apparent specific gravity of 0.18 is loaded. When white carbon was supplied while keeping the tank horizontal, and exhausted naturally from the upper exhaust port and the filter on the floor, the tank was full at about 6 tons. Next, when further supplying while degassing under reduced pressure through a filter on the floor, it was possible to load up to about 8 tons. On the other hand, when the tank is tilted by 23 degrees and white carbon is supplied, about 11 tons can be loaded. Furthermore, when forced deaeration was performed through the floor filter, a further increase of 0.5 tons was possible.
[0029]
【The invention's effect】
In the present invention, unlike a conventional powder transport tank lorry, a powder supply port is installed at the head of the tank, and when loading, the tank is inclined and loaded, so that the bulk specific gravity is 0.07-0. A bulky powder such as 3 g / ml can be loaded with a high weight.
[Brief description of the drawings]
FIG. 1 is a side view of a tank lorry according to the present invention.
FIG. 2 is a view of the tank lorry of FIG. 1 as viewed from the rear, and is a view for explaining the structure of a powder discharge port.
[Explanation of symbols]
1, tank 2, powder supply port 3, 3 ′, exhaust port 4, manhole 5, powder discharge port 6, gas passage 7 in the gasation system supplies or discharges gas to the gas passage The piping 8 for the surface filter 9, the partition plate 10 for the gas passage, the piping 11 for transferring the powder, and the lifting mechanism for tilting the tank

Claims (2)

It is used for transporting powder with a bulk specific gravity of 0.07 to 0.3 g / ml, and consists of gas blowout holes composed of a porous body consisting of fine pores that do not allow powder to pass through almost the entire bottom surface of the tank. It has a gasation system and has an exhaust port with a filter that does not allow powder to permeate on the upper surface of the tank head, a powder supply port on the tank head, and a powder discharge port on the lower end of the tail. And when the powder is transported by the powder transport tank lorry provided with an elevating mechanism for lifting and tilting the head with the vicinity of the tail as a fulcrum, when loading the powder into the tank, A method for filling powder into a powder transport tank lorry, wherein the tank head is lifted by the elevating mechanism to tilt the tank, and the powder is filled from a powder supply port of the tank head. 2. The powder filling method according to claim 1 , wherein the powder filled in the tank is degassed by suction from a gas blowing hole of the gasation system simultaneously with or after the powder filling.

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