JPH1059486A - Storage tank for powdery and granular material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the storage quantity or the like of a powdery and granular material in a tank, by hanging and supporting a tank body provided with a discharge opening at the bottom from a frame base through a measuring means constituted of a combined lever type mechanism and a load cell. SOLUTION: A frame base 4 is installed in a batcher plant 2 and a tank body 6 is suspended from the frame base 4. A measuring means constituted of a combined lever type mechanism CT and a load cell 50 is provided at the side face of the tank body 6. That is, the upper side lever rod 18 and the lower side lever rod 20 are arranged parallelly to each other and rotatably connected through a vertical connection member. The measuring point is connected at the upper part 6A of the tank by the connection member at the free end of the upper side lever rod 18. The load cell 50 is installed at the middle of the connection member. The measuring instrument provided with the load cell 50 detects electrically through the lever type mechanism CT the movement of the tank body 6 moving down by the weight of the powdery and granular material. The data are amplified and transferred to a control disk 60 to indicate them on the display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to cement, lime,
The present invention relates to a granular material storage tank capable of storing a granular material such as a slab and accurately discharging a desired amount.

[0002]

2. Description of the Related Art In a remote site where a mixer truck is impassable or a construction site that requires a cement mixture that cannot be shipped from a ready-made plant, a powder tank is provided at the site only during the construction site, and the tank is installed in the tank. While storing cement, etc., the required amount is taken out while measuring the discharged amount.

[0003] This granular material tank is provided with an accommodating section for a granular material such as cement, a discharge device for taking out the granular material, and a measuring device connected to an outlet of the tank. No. 3-9036).

[0004]

The powdery and granular material tank has a measuring tank dedicated to a measuring device, and the powdery and granular materials discharged from the tank are stored in a measuring tank, measured and then discharged. Therefore, in addition to the powder tank, a measuring tank must be provided, and a conveying means such as a screw conveyor must be provided between the tanks, so that the equipment becomes large and complicated.

[0005] In addition, since the remaining amount of cement and the like in the storage section cannot be accurately grasped, for example, when replenishing the storage section with cement or the like, it is unclear how much of the cement should be replenished. When it is necessary to change the type such as in the middle, the cement before the change may not be used up completely, and a great deal of time and labor may be spent on the processing.

Japanese Patent Application Laid-Open No. 6-171695 discloses a method in which a silo main body is supported on a gantry via a measuring means such as a load cell and the total weight of the silo main body accommodated in cement or the like is measured. There is disclosed a mobile silo that allows a user to grasp the remaining amount of a numerical value.

However, this movable silo measures the weight of the entire silo main body including the housing by means of a weighing means such as a load cell interposed between the lower part of the silo main body and the pedestal to determine the remaining amount in the silo. Therefore, if the housing or the silo shakes or vibrates, accurate measurement becomes difficult.

[0008] When a necessary amount of cement or the like in the storage section is supplied to another apparatus, it is carried out through a screw conveyor having a spiral projection. The granular material may be fluidized and flow naturally from the outlet, making it difficult to discharge a desired amount. Furthermore, since the weight of the entire silo main body portion is applied to the load cell, a large load cell that can withstand this weight is required, and the direction of the load applied to the load cell may not always be vertical, so accurate weighing is difficult. is there.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to accurately measure a storage amount and a discharge amount of a granular material in a granular material storage tank.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a powdery and granular material storage tank in which a discharge port is provided at the bottom of a tank body, and the tank body is suspended and supported on a gantry via a measuring means provided on a side surface of the tank body. There is provided a powdery and granular material storage tank, wherein the weighing means comprises a combination lever mechanism and a load cell.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. On the ground 1, a next-step facility using the weighed powders and granules, for example, a batcher plant 2 for kneading cement is installed. This batcher plant 2 has two input ports 3a,
3b are provided.

A frame 4 is provided in the batcher plant 2, and a tank body 6 is suspended from the frame 4.

The gantry 4 has four horizontal frames 7a each.
The upper frame 4a, the lower frame 4b, and the four vertical frames 7b interposed between the corners of the side frames 4a, 4b, respectively.

The tank body 6 is composed of an upper part 6A and a lower part 6B. The upper part 6A is formed in a cubic shape, and is surrounded by a rectangular long plate 6m and a short plate 6n. The lower part 6B is formed in an inverted truncated pyramid shape, and has a triangular narrow plate 6r and a trapezoidal shape. It is surrounded by the wide plate 6s.

At the bottom 6T of the lower part 6B of the tank body,
A screw conveyor a and outlets 10a and 10b are provided. The screw conveyor 9 is capable of normal rotation and reverse rotation, and is provided with a helical projection 9a on the rotating shaft 9R.
Are formed. The number and size of the blades 9b are appropriately selected as needed.

The outlets 10a and 10b are provided on the left and right sides, respectively, and are provided below the rotary feeder-like blades 9b of the screw conveyor 9.
Dampers 11a and 11b are provided at the tips of 0a and 10b. A discharge chute 1 is provided downstream of the damper 11.
2a and 12b are provided.

The narrow plate 6r of the tank body 6 is provided with an air knocker 13 for dropping cement or the like adhered to the inside of the tank body 6. The air knocker 13 is driven by a baby compressor (not shown).

On the side surface of the tank body 6, there is provided a weighing means comprising a combination mechanism CT and a load cell 50 as described below. That is, frame support bars 15 and 16 are arranged on the long plate m side of the upper part 6A of the tank body 6 so as to sandwich the tank body 6 therebetween. A first upper lever bar 18 is fixed to one end 15a of the support bar 15, and a second upper lever bar 19 is fixed to the other end 15b. The two lever bars 18, 19 are parallel to each other. or,
A first lower lever 20 is attached to one end 16a of the support bar 16.
Is fixed, and the second lower lever bar 21 is fixed to the other end 16b. The two lever bars 20, 21 are parallel to each other.

Outer support point 1 of first upper levers 18 and 19
8a and 19a are connected to the long plate 6m of the gantry 4 via connecting members 25 and 26 such as wires and round bars with both ends threaded. The support points 18a and 19a are provided at positions where a straight line connecting the two points is parallel to the center line of the frame support bar 15. Each connecting member 25 and 26 are formed in the same length H _1.

Inner support point 1 of first upper levers 18 and 19
8b and 19b are connected to the mount 30 of the wide plate 6s via connecting members 27 and 28 such as wires and round bars with both ends threaded. Each connecting member 27, 28 is formed to have the same length H2. The support points 18b and 19b are provided at positions where a straight line connecting the two points is parallel to the center line of the frame support bar 15. The inner support point 18b, 19b and the outer support point 18a, the interval L ₁ between 19a is appropriately selected as needed, for example, distance L ₁ = 50 mm is chosen.

Outer support point 2 of the second lower levers 20, 21
The reference numerals 0a and 21a are connected to the long plate 6m of the gantry 4 via connection members 31 and 32 such as wires. This support point 20
a and 21a indicate that a straight line connecting the two points is a frame support bar 16;
Is provided at a position parallel to the center line of. Each connecting member 31, 32 are formed in the same length H _3.

The inner support point 2 of the second lower levers 20, 21
Ob and 21b are connected to the mount 30 of the wide plate 6s via connecting members 34 and 35 such as wires. Each connecting member 34, 35 are formed in the same length H _4. The support points 20b and 21b are provided at positions where a straight line connecting the two points is parallel to the center line of the frame support bar 16.

The inner support points 20b, 21b and the outer
Distance L between support points 20a and 21a_TwoIs suitable as needed
Is selected as appropriate, for example, the interval L_Two= 50 mm, ie
L_Two= L ₁Is selected.

The first upper lever bar 18 and the first lower lever bar 20
Are arranged in parallel with each other and are rotatably connected via a vertical connecting member 40. This vertical connecting member 4
0 is provided at the center between the frame support bars 15 and 16, the lower end of the member 40 is connected to the end of the first lower lever bar 20 with a pin, and the upper end of the member 40 is the first upper lever. The lever 18 is connected to the free end of the lever 18 with a pin.

A measuring point 45 is provided at the free end of the first upper lever 18 and is connected to the connecting member 4 such as a wire.
6 are connected to the long plate 6m.

The connecting member 46 is disposed vertically, and a load cell 50 is provided in the middle. The measuring device provided with the load cell 50 electrically detects, via a lever type mechanism, the movement of the tank body 6 descending by the weight of the granular material in the tank body 6, and amplifies the data. It is sent to the control panel 60 and displayed on the weighing display section.

The distance L _S between the first inner support point 18b and the measuring point 45 is 1000 mm, and the load concentrates on the measuring point 45. Further, the interval L _t of the metering point 45 and the first outer supporting point 18a is 1050mm, and the first inner support point 18b
Is the maximum weighing point.

The upper part 6A of the tank body 6 is closed by a top plate 55. This top plate 55 has a bag filter 56.
And first and second full level detection levelers 57a and 57b. The bag filter 56 is a cloth-made cylindrical filter provided with a pulse-air type removing device. The bag filter 56 separates the granular material and the carrier air by the cylindrical filter when the mixed gas flow of the granular material and the carrier air is pressure-fed into the tank body 6, and separates the granular material from the tank body 6. And the carrier air is discharged out of the device.

The full-amount detecting levelers 57a and 57b are both provided so as to protrude into the tank body 6, and a rotating blade (not shown) is provided at the tip thereof. The leveler 57a is configured such that the set amount of the granular material, that is, the set full amount is equal to the tank body 6.
This is a first leveler that detects a point in time when it has accumulated inside, and the leveler 57b is a second leveler for emergency use. The leveler 5
The rotating blade 7a is provided at the position of the set full amount.
The second leveler 57b is provided at a higher position.

Reference numeral 59 denotes a handrail for preventing falling provided on the horizontal frame 7a of the gantry 4. Reference numeral 60 denotes a control panel that is provided separately from the batcher plant 2 and controls weighing and the like. 61 is a steady rest device, 62 is a rest device, and these 61 and 62 are means for preventing rattling when the tank body 6 is carried.

Next, the operation of the present embodiment will be described. First, the supply of the granular material into the tank body 6 will be described. The powdered material, for example, cement, is loaded on a bulk truck (not shown) and transported to the construction site, and the pumping port of the bulk truck is connected to the receiving pressure pipe 66.

When the supply switch (not shown) of the control panel 60 is turned on, the associated pumping means is ready, and when the pumping valve on the bulk truck side is opened, the cement in the bulk truck mixes with the carrier air. While passing through the receiving pressure feeding pipe 66 as a mixed gas stream, the air is pressure fed toward the inside of the tank body 6. The mixed airflow is separated into air and cement by the bag filter 56, and the carrier air A is discharged outside through the bag filter 56, and the cement falls and accumulates in the tank body 6.

When the set amount of cement in the tank body 6 is accumulated, for example, 2000 kg, the rotating blades of the rotating full level detecting leveler 57a cannot rotate due to the resistance of the cement. Then, a buzzer and a patrol light (not shown) are activated to generate an alarm and notify that the battery has reached the full capacity. Based on this notification, the pressure feed valve of the bulk truck is closed to stop the supply of cement into the tank body 6.

However, during normal operation, a buzzer and a patrol light operate in the same manner as the leveler 57a to generate an alarm and notify the full capacity, according to the setting of the amount of reception incorporated in the control mechanism of the measuring instrument. The supply must be stopped immediately by closing the pumping valve of the bulk truck.

Due to the failure of the above-described full-amount detection leveler 57a and the like,
When the alarm device does not operate, or when the closing of the pumping valve of the bulk truck is delayed, the rotating leveler 57 is rotated.
The rotating blade b stops rotating due to the resistance of the cement and cannot rotate. Then, the buzzer and the patrol light are activated to issue an alarm, and an emergency notification is given that the amount has exceeded the set amount.

On the basis of this emergency notification, a shut-off valve (not shown) provided on the receiving pressure feed pipe 66 is urgently closed to stop the supply of cement into the tank body. The leveler 57b can prevent an excessive supply of the granular material into the tank main body 6, so that an explosion accident of the tank main body 6 can be prevented.

Next, a case where a desired amount of cement in the tank body 6 is discharged will be described. First, it is determined which one of the outlets 10a and 10b is to be used. For example, the outlet 10a is determined and connected to the batcher plant via the outlet chute 12. Start weighing of control panel 60 O
After confirming that the K lamp is lit, a desired weighing value, for example, 200 kg is set. Thereafter, when a payout switch (not shown) is turned on, the damper 11a of the discharge port 10a is opened.

The screw conveyor 9 can rotate forward and backward. However, the direction of rotation is determined so that the cement is sent to the discharge port 10a side. It is forcibly moved toward the discharge port 10a by the rotation of the screw conveyor 9, and is supplied to the batcher plant from the discharge port 10a through the discharge chute 12.

With the accessories such as the tank body 6 and the bag filter 56, the total weight of the load is constantly measured by the load cell 50 and sent to the control panel 60. In this embodiment, the set amount W is 2000 kg. However, since a combination lever mechanism is used, the load W is directly applied to the first inner support point 18 b (the balance point) and the weighing point 45 (concentration point). , A load is applied in a direction in which the load cell 50 is pulled up vertically.

Assuming that the load W _{0 at the} measuring point 45 is a tare load W ₁ , that is, the load of the tank body 6, the weight of the damper 11 and the bag filter 56 is 43.3 kg, 43.3 kg + 2000 × L ₁ / L _t = 43.3 + 200
0 × 50/1050 = 43.3 + 95.2 = 138.5 (kg).

That is, the actual weight is 2043.3 kg, which is the sum of the set amount W = 2000 kg and the tare weight of 43.3 kg, but the load cell 50 receives only 138.5 kg in the vertical direction. become. The value obtained by subtracting the tare weight W ₁ from the load W _0, that is, 95.2
kg is a measured value corresponding to the cement weight W = 2000 kg.

The measured value of the load cell 50 is input to the computer, the remaining amount W ₃ of cement in the tank body 6 is obtained by subtracting the tare weight W ₁ , and the discharge amount W ₄ is calculated. The cement remaining amount W ₃ and the discharged amount W ₄ are converted into actual weights and then displayed on a display unit (not shown) of the control panel 60.

Immediately before the desired weighing value of 200 kg, for example, 1
After closing the damper once with 80 kg, a minute amount of cement is discharged from the discharge port 10 a while finely measuring the remaining 20 kg. In the fine weighing method, the opening and closing of the damper in a short time is repeated several times until the set value reaches 200 kg, whereby the accuracy of the weighing can be improved.

The screw conveyor 9 is provided at both ends with rotor lifter-like blades 9b. When the granular material is cement, if the discharge from the discharge port 10a is performed only with a normal screw conveyor, the cement fluidizes and flows down from the discharge port vigorously.
In some cases, it may be difficult to discharge the desired value. However, if the rotor 9 is used, the above problem can be solved and the discharge amount can be adjusted accurately.

When the desired weighing value reaches 200 kg, the screw conveyor is automatically stopped, the damper is closed, and the discharge is stopped.

The above steps are repeated to discharge a desired amount of cement. At this time, the discharge port to be used and the rotation direction of the screw conveyor are appropriately changed as necessary. For example, when the amount of cement at the discharge port 10a side is smaller than that at the discharge port 10b side, the screw conveyor 9 is The cement is discharged from the discharge port 10b while rotating in the reverse direction.

As a result, the cement surface in the tank body 6 becomes flat, so that imbalanced load can be prevented from being applied to the measuring means, and the load can be measured in a stable state. The weighing accuracy is improved.

The powders and granules stored in the tank body 6 are not particularly limited. In addition to cement, inorganic powders such as lime and slag, feeds, fertilizers, various raw materials, powders and granules of products, etc. It is targeted.

After the completion of the measurement, the air knocker 13 is driven to strike the side surface of the granular material storage tank to give a shock.
Remove the cement adhering to its inner surface and clean it. Although a compressor is used as a driving means for a damper at the discharge port, a means for removing a bag filter, an air knocker, etc., the invention is not necessarily limited to this.

In the above embodiment, one load cell is used. However, the number is not particularly limited, and may be appropriately selected as needed, and a plurality of load cells, for example, four load cells may be used. Further, the measuring means may be provided on both side surfaces of the tank body 6.

[0051]

As described above, the present invention is configured as described above, so that the amount of the granular material in the tank body and the amount of the discharged granular material can be accurately measured. Therefore, it is possible to accurately supply a necessary amount of powder and granules. In addition, since the combination type lever mechanism is used, weighing can be performed in a vertical load direction without applying a full load to the load cell. Therefore, accurate measurement can be performed using a small load cell as compared with the conventional example.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a front view of a tank main body.

FIG. 4 is a side view of the tank body.

FIG. 5 is a front view of a main part of the combination lever mechanism.

FIG. 6 is a rear view of a main part of the combination lever mechanism.

FIG. 7 is a plan view of the tank main body.

FIG. 8 is a plan view showing the relationship between the tank main body and the measuring means.

FIG. 9 is an enlarged perspective view of a screw conveyor.

[Explanation of symbols]

 Reference Signs List 4 base 6 tank body 9 screw conveyor 10a discharge port 10b discharge port 13 air knocker 15 frame support bar 16 frame support bar 18 first upper lever bar 19 second upper lever bar 20 first lower lever bar 21 second upper lever bar 40 Vertical connecting member 50 Load cell 57a First full level detection leveler 57b Second full level detection leveler

Claims (7)

[Claims] 1. A powdery and granular material storage tank in which a discharge port is provided at the bottom of a tank main body and the tank main body is suspended and supported on a gantry via a measuring means disposed on a side surface of the tank main body; A granular material storage tank comprising a combination lever mechanism and a load cell. 2. A combination lever type mechanism comprising an upper lever bar and a lower lever bar rotatably connected by a vertical connecting member, wherein outer support points of both lever bars are connected to a gantry, 2. The storage tank according to claim 1, wherein the inner supporting point is connected to the tank body, and the measuring point of the upper lever is connected to the gantry via a load cell. 3. The method according to claim 1, wherein the upper lever is fixed at a right angle to one of the frame supporting bars arranged so as to sandwich the tank body, and the lower lever is fixed at a right angle to the other frame supporting bar. The storage tank according to claim 2, characterized in that: 4. The granular material storage tank according to claim 1, wherein the bottom is formed in an inverted truncated pyramid shape, and the discharge ports are formed at both ends of the bottom. 5. The powder according to claim 4, wherein the bottom has a built-in screw conveyor capable of rotating forward and backward, and the screw conveyor has rotor lifter-like blades at both ends thereof. Granule storage tank. 6. A first full level detecting leveler for detecting a set full level, and a second full level detecting means for detecting an excess of the set full level when the first full level detecting means is out of order. The granular material storage tank according to claim 1, further comprising an amount detection leveler. 7. The storage tank according to claim 1, wherein the tank body includes an air knocker.