JP3509518B2 - Stretching method of canvas in air slide device for granular material tank and canvas - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for tensioning a canvas in an air slide device for a powder or granular material tank mounted on a powder or granular material carrier or the like, and a canvas used for the method.

[0002]

2. Description of the Related Art Conventionally, in a powder or granular material tank, a powder or granular material discharging portion is provided at the bottom of the tank, and an air slide composed of a perforated plate and a canvas stretched on the upper surface of the powder or granular material discharging portion. A device is provided, and the pressure air supplied to the air chamber below the air slide device is jetted through the air slide device into the powder particle storage chamber above the air slide device to fluidize the powder particles inside the chamber and externally The canvas forming such an air slide device is formed in a funnel shape as a whole in order to form an inclined surface having an angle of repose or more of the granular material on the upper surface thereof. Therefore, the conventional way of stretching canvas is to fix the central part of the canvas to the bottom wall of the powder discharge unit first, then pull the outer periphery of the canvas outward and expand the outer periphery of the canvas by expander. I tried to stop it at the attachment part of the discharge part, but at that time it is difficult to pull the canvas until it becomes the predetermined funnel shape, so it is necessary to make the canvas itself from the beginning, so that The canvas was forced to have at least one seam in its radial direction.

[0003]

By the way, since the conventional canvas has at least one seam formed in the radial direction, when discharging the powder or granular material on the canvas,
There is a problem that the granular material is caught in the seam of the canvas and remains there. Further, since the canvas has a seam, an extra work is required and the manufacturing cost is increased.

The present invention has been made in view of the above circumstances, and a novel powder capable of solving all of the above problems by making it possible to easily stretch a seamless canvas on the discharge portion of the powder and granular material. An object of the present invention is to provide a method for stretching a canvas in an air slide device for a granular tank and a canvas used directly in the method.

[0005]

In order to achieve the above object, the present invention according to claim 1 is a method for stretching a canvas of an air slide device provided in a powder discharge unit at the bottom of a powder tank. , An annular shape in which the outer peripheral edge of the canvas, which is seamless on the upper surface, is formed on the inner peripheral surface of the attachment part of the powder and granular material discharge part
Clamp between groove and expander ring with adjustable expansion / contraction
An enormous volume that was fixed and formed on the outer edge of the canvas
A step of engaging the said expander ring section, said Engineering
The outer peripheral edge part is the annular groove of the mounting part and the expander ring.
While pulling the canvas clamped between it and the center of the canvas toward the center, push down the center of the canvas to make it into a funnel shape. And a step of fixing to a wall. According to such a feature, the outer peripheral edge of the canvas is
Section formed on the inner peripheral surface of the mounting part of the powder and granular material discharge part
And expander ring with adjustable expansion and contraction
The outer edge of the canvas and
Engage with panda ring, then center the canvas
While pulling in the direction, push down the central part
Make the canvas funnel-shaped, then
The central part was fixed to the bottom wall of the powder discharge unit.
Thus, a seamless canvas can be easily stretched over the powdery or granular material discharging portion, the tensioning work is facilitated, and the canvas is free from the powdery or granular material due to the seamlessness. Also, set the outer edge of the canvas as above.
When pulling in the center direction, the bulge of the outer edge of the canvas
Engages the spander ring on the outer edge of the canvas
Does not come off from the mounting portion.

To achieve the above object, according to the invention of claim 2, the canvas used in the method of claim 1 is formed into a ring shape from a seamless breathable fabric, and characterized in that the enlarged portion at the outer peripheral edge is formed, according to this aspect, seamless canvas tension toward the center to fix the outer peripheral edge portion to the attachment portion of the particulate material discharge portion When this is done, the outer peripheral edge portion does not come off from the mounting portion.

In order to achieve the above object, the present invention is described in claim 3.
According to the invention, the method according to claim 1 is used.
A canvas made of seamless breathable fabric
Is formed in a circular shape, and an upright portion that rises upward is formed on the outer peripheral edge thereof.
Are integrally formed, and the upper edge of this standing part is
It is characterized in that the enlarged portion is formed over
According to this feature, the seamless canvas is
The outer peripheral edge is fixed to the attachment part of the powder and granular material discharge part
The outer peripheral edge of the
And its uprights will not expose the canvas.
Clamped between the spander ring and the annular groove of the mounting part
When doing, wrinkles can be less likely to occur.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

FIG. 1 is a side view of a granular material carrier equipped with a granular material tank equipped with an air slide device, FIG. 2 is a partially cutaway side view of the granular material tank, and FIG. 2 of 3-3
6 is an enlarged vertical cross-sectional view taken along the line, FIG. 4 is an enlarged view of a virtual line enclosing portion taken along line 4 of FIG. 2, FIG. 5 is a plan view taken along line 5 of FIG.
[Fig. 6] is an enlarged view of a virtual line enclosing portion viewed from the direction of arrow 6 in Fig. 4.

In FIG. 1, a sealed granular material tank T made of aluminum alloy is mounted on the chassis frame of the granular material transportation vehicle V. The granular material tank T is formed to be long in the traveling direction of the granular material transportation vehicle V, that is, in the front-rear direction.
The manhole that is opened and closed by the opening is opened, and the granular material is put into the granular material tank T from this manhole and stored.

As shown in FIGS. 2 and 3, in the lower part of the powder and granular material tank T, three powder and granular material discharging parts D are formed at intervals in the longitudinal direction, namely, front, rear and intermediate. A discharge pipe 1 is fixedly supported on the lower inclined wall 5 of the powder and granule tank T corresponding to each powder and granule discharge part D, and the discharge pipe 1 is curved in an elbow shape and faces downward. The open end of the funnel shape that spreads out toward the powder and granular material discharge portion D is faced, and the outer end thereof extends through the butterfly valve 2 and the connecting pipe 3 to the collective discharge pipe 4 extending in the longitudinal direction of the powder and granular material tank T. Connected to.
Then, the granular material in the granular material tank T is discharged to the outside through the discharge pipe 1 and the collective discharge pipe 4 by the pressure air.

As shown in FIGS. 3 and 4, each powder and granule discharging section D
Is a funnel-shaped inclined wall 5 at the bottom of the granular material tank T.
Is formed by a bottom wall 6 fixed to the bottom edge of the bottom wall 6 by welding or the like, and between the bottom edge of the inclined wall 5 and the top edge of the bottom wall 6, an attachment portion, that is, an annular holding ring. 7 is fixed by welding or the like. As shown most clearly in FIG. 6, the retaining ring 7 is formed in a block shape having a thick wall in cross section so as to have sufficient rigidity to clamp and fix a split porous plate 12 and a canvas 14 which will be described later. On its inner surface,
An annular groove 8 having a V-shaped cross-section that is open laterally is formed, and an annular seal rubber 9 is also integrally bonded to the inner portion of the annular groove 8.

As shown in FIG. 4, the powder discharge unit D includes
An air slide device A is provided which divides the powdery or granular material discharge portion D into a powdery or granular material storage chamber Cp and an air chamber Ca that communicates with an air pipe 10 that communicates with a pressure air supply source (not shown).

The structure of the air slide device A will be described below. The air slide device A is shown in FIGS.
As shown in FIG. 2, the split-type perforated plate 12 and the breathable and stretchable canvas 14 stretched on the upper surface of the split-type perforated plate 12 are formed in a funnel shape of a flat ring shape. The inner peripheral edge portions of the perforated plate 12 and the canvas 14 are tightened by a tightening plate 16 with packing 17 on the upper surface of the pedestal 15 which is superposed on each other and fixed to the lowermost part of the bottom wall 6 of the powder or granular material discharge part D. The bolts 18 are fixed, and the outer peripheral edges thereof are also overlapped, and as will be described later in detail, they are integrally clamped and fixed by the expander ring 20 in the annular groove 8 of the mounting portion, that is, the inner peripheral surface of the retaining ring 7. .

Next, constituent parts of the air slide device A will be described in order.

The divided perforated plate 12 is formed of a metal plate, and is formed by combining a plurality of fan-shaped perforated plates 13 which are divided into a plurality of, in this embodiment, four in a funnel shape. FIG. 7 is a perspective view of the split type perforated plate 12. Hereinafter, the structure of each perforated plate 13 will be described with reference to FIG. 7, which is formed in a fan shape by a metal plate such as an aluminum alloy plate. The flat plate-shaped main body 13 ₁ is formed flat and has a large number of ventilation small holes 21. Further, strip-shaped left and right reinforcing pieces 13 ₂ and 13 ₃ bent downward at substantially right angles over substantially the entire length are integrally formed on both left and right edges of the main body portion 13 ₁ , and the arc-shaped inner peripheral edges thereof are formed. A flange-shaped inner clamping piece 13 ₄ is integrally formed, and a flange-shaped outer clamping piece 13 ₅ is integrally formed on the arc-shaped outer peripheral edge of the arc-shaped outer peripheral edge. Angle-shaped notches 13 ₆ for forming are formed, and the engagement protrusions 7 ₁ of the retaining ring 7 can be engaged with these notches 13 ₆ .
The four fan-shaped perforated plates 13 are assembled in a ring shape as shown in FIG. 5 by abutting the side edges of the other perforated plates 13 on their side edges.

FIG. 8 is a plan view of the canvas 14, and FIG.
FIG. 9 shows a partial longitudinal side view of the canvas taken along the line 9-9 in FIG. 8, and FIG. 10 shows an enlarged view of the virtual line encircling portion as viewed in the direction of arrow 10 in FIG. To explain the structure of the canvas 14, the canvas 14 is made of a vinylon-based or tetoron-based fiber strip woven by "twill weave" or the like. 5450G) is constituted by heat cutting dished and the outer peripheral edge thereof, the upstanding portion 14 ₁ for standing in an L-shape upward are integrally formed. Meanwhile the upright portion 14 ₁ may be formed during weaving the canvas 14, or may be formed by post-processing after weaving flat fabric. And this upright section 14 _1, when clamped fixing the canvas 14 to the holding ring 7 by the expander ring 20, wrinkles are less likely to occur. The standing portion 14 ₁
At the upper edge of the bulge, the bulge or bead 14
₂ is formed, and a synthetic resin core material 22 is inserted into the bead 14 _{2 to} retain the upper edge of the standing portion 14 ₁ .

FIG. 11 is a plan view of the expander ring 20, and FIG. 12 is a partially cutaway enlarged view of the virtual line encircling portion as viewed in the direction of arrow 12 in FIG. 11, and these drawings will be referred to. The structure of the expander ring 20 will be described. The expander ring 20 is for fixing the outer peripheral portions of the split perforated plate 12 and the canvas 14 to the powder or granular material discharge portion D, and is made of carbon steel. A pair of semi-circular ring halves 20 ₁ and 20 ₂ formed of a pipe material are connected at their proximal ends by a hinge pin 24 so as to be openable and closable, and their free ends are connected at an adjustable metal fitting 25 so that their lengths can be adjusted. Has been done. This adjustment metal fitting 25 is used for one ring half 20.
_The male cone portion 27 formed at the free end of the nut 27 is composed of a bolt 26 rotatably connected to the free end of ₁ and a bag-shaped nut 27 screwed to the bolt 26.
₁ is rotatably abutted against a female cone portion 20 ₃ formed at the free end of the other ring half body 20 ₂ , and selectively into a plurality of pin holes 28, 29 bored in a nut 27. By inserting the pin portion p of the tool and adjusting the rotation of the nut 27, the expansion and contraction of the expandable metal fitting 25 can be expanded and contracted.

As shown most clearly in FIG. 6, the retaining ring 7 fixed between the lower edge of the inclined wall 5 of the granular material tank T and the outer peripheral edge of the bowl-shaped bottom wall 6 is It cooperates with the expander ring 20 to form a mounting portion for holding and fixing the outer peripheral edge portions of the split type perforated plate 12 and the canvas 14, and the annular groove 8 on the inner peripheral surface thereof is the split type perforated plate. In order to receive the outer peripheral edges of the canvas 12 and the canvas 14, a V-shaped cross section is formed, and the annular elastic seal rubber 9 is bonded to the inner part of the annular groove 8 as described above.

Next, the split type perforated plate 12 and the canvas 1
13 is a schematic view of the mounting process for attaching 4 to the powder discharging unit D of the powder tank T. As shown in FIG. The four perforated plate single bodies 13 accommodated in the powder and granular material tank T are assembled in the powder and granular material discharge part D into a ring-shaped funnel-shaped split perforated plate 12. At this time, as shown in FIG. 6, the outer peripheral edge of the split type perforated plate 12, that is, the outer sandwiching piece 13 ₅ of the four perforated plate unit 13 is superposed on the inclined surface 8 ₁ of the annular groove 8 of the retaining ring 7. The reinforcing pieces 13 ₂ and 13 ₃ protruding downward of each porous plate unit 13 do not come into contact with the bottom wall 6, and a space is formed between the reinforcement pieces 13 ₂ and 13 ₃ over the entire area with the bottom wall 6.

[0021] Next, as shown in FIG. 13 (b), the canvas 14, the split of the standing part 14 ₁ that extends from the outer edge of the perforated plate 12, split porous plate 12 by receiving in the annular groove 8 It is superposed on the outer clamping piece 13 ₅ and the seal rubber 9. Then, after the outer peripheral edge of the expander ring 20 is opposed to the annular groove 8, the adjusting metal fitting 25 is adjusted to expand the expander ring 20, so that the expander ring 20 and the annular groove 8 are separated from each other. , The outer sandwiching pieces 13 ₅ of the split type perforated plate 12 and the standing portions 14 ₁ of the canvas 14 are sandwiched and fixed. At this time, due to the wedge action of the outer surface of the expander ring 20 and the inclined surface of the annular groove 8, the outer edge portions of the split porous plate 12 and the canvas 14 are firmly fixed, and the enlarged portion of the outer edge of the canvas 14, that is, the bead 14 ₂ can engage with the expander rings to counteract the excessive pulling force acting in the outward direction (arrow direction in FIG. 6). Further, in order to fix the split type porous plate 12 in the annular groove 8, a fixing agent such as an adhesive or a fixing member as in the prior art is unnecessary.

Next, as shown in FIG. 13 (c), while pushing the canvas 14 from above, the canvas 14 is pulled toward the center to be superposed on the upper surface of the split type perforated plate 12, and its inner edge is
By overlapping the inner edge of the split porous plate 12 on the pedestal 15 and fixing the clamping plate 16 to the pedestal 15 with the packing 17 sandwiching the packing 17, the inner edges of the split porous plate 12 and the canvas 14 are fixed. It is fixed to the bottom wall 6.

As described above, the canvas 14 can be stretched on the split type perforated plate 12 in a tensioned state. Since the canvas 14 has no seam on its upper surface, the granular material on the canvas 14 can slide smoothly. Can be made.

It is to be noted that the split type perforated plate 12 is composed of four perforated plates alone 13. When exchanging the perforated plates, each perforated plate 13 is put into the granular material tank T from the manhole and the inside of the tank T is replaced. Since the single porous plate 13 is assembled to form the split porous plate 12, the replacement work of the split porous plate 12 is facilitated.

In order to discharge the powder or granular material contained in the powder or granular material storage chamber Cp, pressure air is supplied from the pressure air supply source (not shown) into the air chamber Ca through the air pipe 10. The pressure air that has flowed into the air chamber Ca reaches the entire area of the air chamber Ca through the gap between the split porous plate 12 and the bottom wall 6. At this time, the reinforcing pieces 13 ₂ , 13 _{3 of} each single porous plate 13
Since the bottom wall 6 is not in contact with the bottom wall 6, the pressure air in the air chamber Ca has less resistance and can be spread over the entire area. The pressure air in the air chamber Ca passes through the canvas 14 from the plurality of ventilation small holes 21 of the split type porous plate 12 and is jetted into the powder or granular material storage chamber Cp. As a result, the granular material in the granular material storage chamber Cp is fluidized and the pressure in the chamber Cp is increased, and the granular material passes from the discharge pipe 1 through the collecting and discharging pipe 4 to the granular material tank T. It is pumped out and discharged.

In the process of discharging the powder or granules, the canvas 14 is formed seamlessly and has a flat entire surface, so that the powder or granules placed on the canvas 14 resists on the canvas 14. Unlike the conventional canvas with seams, powder particles do not remain on the canvas 14 unlike the conventional canvas with seams, and the split-type perforated plate 12 is Since there is no contact with the bottom wall 6, deformation of the bottom wall 6 is prevented.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment and various embodiments are possible within the scope of the present invention. For example, in the above-mentioned embodiment, the case where the present invention is applied to the granular material tank mounted on the granular material transportation vehicle has been described, but the granular material tank mounted on another vehicle or the stationary type granular material tank is described. Of course, it can be carried out, and the split type perforated plate,
The canvas may be composed of a combination of 2, 3 or 5 or more perforated plate units, and the canvas may be composed by laminating a plurality of cloths. Further, the canvas may be a woven cloth, a knitted cloth or a non-woven cloth. You may comprise, and the material does not matter.

[0028]

As described above, according to the first aspect of the present invention, the outer peripheral edge portion of the canvas is attached to the attachment portion of the granular material discharging portion.
An annular groove formed on the inner peripheral surface and expandable expansion adjustable
It is sandwiched and fixed between the dolling and the canvas.
Engage the enlarged portion of the outer edge with the expander ring, and then
While pulling the canvas toward the center with
Part, push down to make the canvas funnel-shaped,
Next, use the center of the canvas as the bottom wall of the powder discharge unit.
Since it was fixed , a seamless canvas,
Since it can be easily stretched on the powder discharge unit, the tensioning work is facilitated, and since there is no seam on the canvas, the powder does not remain. Again the canvas
When pulling in the center direction as described above,
Enlarged part is engaged with expander ring,
The outer peripheral edge portion of the cloth does not come off from the mounting portion.

According to the second aspect of the invention, in the seamless canvas, when the outer peripheral edge portion is fixed to the attachment portion of the powder or granular material discharge portion and pulled in the central direction, the outer peripheral edge portion is It does not come off from its mounting part.

According to the invention of claim 3, the seam
If there is no canvas, remove the outer edge of the canvas from the powder discharge section.
When fixed to the attachment part and pulled in the center direction, its outer peripheral edge part
Does not come off from its mounting part, and
The standing part that is integrally formed with the part expands the canvas.
When sandwiching and fixing between the dulling and the annular groove of the mounting part
In addition, wrinkles can be less likely to occur.

[Brief description of drawings]

[Figure 1] Side view of a granular material carrier equipped with a granular material tank

[Fig. 2] Partially cutaway side view of the granular material tank

FIG. 3 is an enlarged vertical sectional view taken along line 3-3 of FIG.

FIG. 4 is an enlarged view of an imaginary line encircling portion viewed from arrow 4 in FIG.

5 is a plan view taken along line 5 of FIG.

6 is an enlarged view of an imaginary line encircling portion viewed from arrow 6 in FIG.

FIG. 7 is a perspective view of a single perforated plate.

FIG. 8 is a partially omitted plan view of the canvas.

FIG. 9 is a partial vertical cross-sectional side view of the canvas taken along line 9-9 in FIG.

FIG. 10 is an enlarged view of a virtual line encircling portion viewed from the direction of arrow 10 in FIG.

FIG. 11 is a plan view of the adjustment fitting.

FIG. 12 is a partially cutaway enlarged view of a virtual line encircling portion viewed from arrow 12 of FIG.

FIG. 13 is a schematic view showing a process of attaching the canvas.

[Explanation of symbols]

6 ... Bottom wall 7 ... Retaining ring 8 as an attachment part 8 Ring groove 14 Canvas 14 ₁ Standing part _{2 2} Expanded part (canvas) 20 Ex Panda ring A ··· Air slide device D ··· Powder discharge unit T ··· Powder tank

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 88/72 B65G 53/38 B60P 3/22

Claims (3)

(57) [Claims] 1. A method for stretching a canvas of an air slide device (A) provided in a powder discharge unit (D) at the bottom of a powder tank (T), the outer peripheral edge of a seamless canvas (14). Part formed on the inner peripheral surface of the attachment part (7) of the powder and granular material discharge part (D)
Groove (8) and expander ring (2
It is sandwiched and fixed between (0) and the canvas (1
The enlarged part (14 ₂ ) formed on the outer edge of 4) is expanded into
Engaging with the dulling (20), and an annular groove (8) having an outer peripheral edge portion of the mounting portion (7) in the step.
While pulling the canvas (14) sandwiched and fixed between the expander ring (20) and the expander ring (20) toward the center, the center part is pushed downward to make the canvas (14) into a funnel shape. And a step of fixing the central part of the canvas (14) to the bottom wall (6) of the powder or granular material discharge part (D). Installation method. 2. A canvas (14) used in the method of claim 1, formed on the ring by breathable fabric seamless, the enlarged portion at its outer peripheral edge (1
4 ₂ ) is formed on the canvas. 3. The key used in the method according to claim 1.
It is a canvas (14) and has a seamless breathable fabric
It is formed in a more annular shape and stands upright on the outer peripheral edge.
Standing part (14 ₁ ) Is integrally formed, and the upright portion (14
₁ ), The enlarging part (14 ₂ )
A canvas characterized by being formed.