JPH11343016A - Pneumatic floatation type belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To independently increase the compressed air jetting force by connecting the air suction pipes with a point directed toward the upstream side of the compressed air in an air duct, to the air supply openings. SOLUTION: A belt 6 is inserted into a cylindrical belt supporting member 7 to be travelled with a semi-circular cross section. On this occasion, an air duct 18 along a travelling direction of the belt 6, is mounted at a lower portion of the belt supporting member 7, and a plurality of air supply openings 20 communicated with the inside of the air duct 18 are formed. The air suction pipes 21 respectively having a point side 21a directed to the upstream side of the compressed air in an air duct 18 is connected to the air supplying openings 20 on a required part A having high contact pressure between the belt 6 and the belt supporting member 7. Whereby the flow velocity of the compressed air jetted from the air supply holes 20 can be partially increased and the belt floating force of the required part A is independently increased, which prevents the contact of the belt 6 and the belt supporting member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-floating belt conveyor in which air is blown out from an air blow-out hole formed in a belt support so that a part of the belt floats above the belt support and runs. Related to the device.

[0002]

2. Description of the Related Art As a conventional belt conveyor device of this kind, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-206122, a forward end portion of an endless flexible belt wound around a pair of pulleys is known. Is inserted into the inner circular pipe of the inner and outer double circular pipes arranged coaxially, and the return path portion of the belt is inserted between the outer circular pipe and the inner circular pipe so that the outward path and the return path are By running the belt in a gutter-like or trough-like shape, and blowing air inward from air blowing holes formed at regular intervals below the inner and outer circular pipes to float the belt. In addition, there is one that reduces the running resistance of the belt.

Further, there is a type in which a circular pipe for inserting the forward path portion of the belt and a circular pipe for inserting the return path portion are arranged vertically in parallel.

[0004]

In the conventional apparatus as described above, the trough conversion is performed between a portion where the belt travels in a convexly curved shape in the vertical direction and a portion of the belt from a pulley to a completely gutter-shaped portion. There is a portion where the contact pressure between the belt and the belt support material is locally high, such as a portion or a portion where a conveyed object is dropped from a chute at the start end of the outward path of the belt.

[0005] In such a portion, a part of the belt may come into contact with the belt supporting member, and the running resistance of the belt may increase.

The present invention has been made in view of the above-mentioned problems of the prior art, and is capable of individually increasing the ejection power of compressed air ejected from an air outlet only by adding a simple structure. As a result, the ejection power of the compressed air ejected from the air outlet at the portion where the contact pressure between the belt and the belt support material is locally high as described above is locally increased, and the belt support at that portion is increased. It is an object of the present invention to provide an air-floating belt conveyor device that prevents a belt from contacting a material.

[0007]

According to the present invention, the above-mentioned problem is solved as follows. (1) A belt supporting member is disposed close to at least a part of an endless belt looped between a pair of pulleys, and an air duct connected to a compressed air source is provided below the belt supporting member. The compressed air in the air duct is blown out toward the belt from an air blowing hole formed in the belt support so as to communicate with the air duct, so that the belt floats above the belt support and runs. In the air levitation type belt conveyor device described above, an air introduction pipe whose leading end is directed to the upstream side of the flow of the compressed air in the air duct is connected to one of the air blowing holes.

(2) In the above item (1), the air blowing holes at the portions where the contact pressure between the belt and the belt supporting member is high,
Connect the air inlet tube.

(3) In the above item (1) or (2), an air introduction pipe is connected to an air blowout hole provided in a belt support member in the arched curved traveling portion of the belt.

(4) In any one of the above items (1) to (3), the chute is disposed above the start end of the outward path of the belt, and the air is blown into the air blowing hole provided in the belt support below the chute. Connect the inlet pipe.

(5) In any one of the above items (1) to (4), the air inlet pipe may be an air inlet portion parallel to the flow of the compressed air in the air duct, and a guide from the base end to the air outlet. Department.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1-3, a horizontally long frame
The head pulley (4) and the tail pulley (5), which are pivotally supported at the front and rear ends of (1) with axes (2) and (3) facing in the left-right direction, have a flexible endless flat plate. The belt (6) is wound around and the tail pulley (5) is rotationally driven by a motor (not shown) so that the belt (6) can be run in the direction indicated by the arrow in FIG.

The outward path portion of the belt (6) (hereinafter, the outward belt (6)
a)) and a return section (hereinafter referred to as a return belt (6b)) are each formed of a pair of upper and lower parallel cylindrical belt support members formed by steel pipes supported by the frame (1).
(7) It is inserted through (8) and has a substantially semi-arc-shaped gutter-shaped cross section for running.

Tail pulley (5) in forward belt (6a)
Below each trough conversion section (9) between the belt support (7) and one end of the belt support (7) adjacent thereto and between the other end of the belt support (7) and the head pulley (4), a belt support is provided. The end connected to the member (7) has a semicircular shape substantially the same as the lower half of the belt support (7), and has a gradual curvature from there toward the tail pulley (5) or the head pulley (4). It becomes large, and finally belt support materials (10) (11) which are almost flat are arranged,
It is supported by the frame (1).

Also, between the head pulley (4) of the return belt (6b) and one end of the belt support (8) adjacent thereto, and between the other end of the belt support (8) and the tail pulley (5). Above the trough converting section (12), guide rollers (13) and (14) pivotally supported by the frame (1) are arranged.

The trough converting section (9) in the forward belt (6a)
A chute (16) for supplying a conveyed object (15) such as powder onto the forward belt (6a), and a load receiving hopper (17) at a position directly below the head pulley (4). The conveyed object provided on the forward belt (6a) from the chute (16)
(15) is a belt supporting material (10) (7) together with the forward belt (6a).
After passing through the inside of (11) and passing through the head pulley (4), it is dropped to the receiving hopper (17).

The return belt (6b), which has become empty after rotating around the head pulley (4), is returned to the tail pulley (5) through the belt support (8).

Air ducts (18) and (19) are provided immediately below the belt supports (7) and (8) and the belt supports (10) and (11) connected to the belt supports in the running direction of the belt (6). In the center of the lower part of each belt support (7) (8) (10) (11), air duct (1)
8) A plurality of air outlets (20) communicating with the inside of (19) are formed at appropriate intervals in the longitudinal direction. The belt support member (10) on which the chute (16) is disposed at the upper side is provided with three rows of air blowing holes (20).

The left end of the air ducts (18) and (19) in FIG. 1 is connected to a compressed air source (not shown), and the compressed air sent into the air ducts (18) and (19) is supplied to the air outlet ( 20) blows out toward the lower surface of the belt (6), and the belt (6)
Is slightly lifted from each of the belt supports (7), (8), (10) and (11), and the running resistance of the belt (6) is reduced by a roller or the like.
(6) is remarkably reduced as compared with the case of supporting.

According to the present invention, in the above-described air-floating type belt conveyor device, as shown in FIGS. 6 and 7, for example, a cylindrical belt support member (7) and an air duct
(18) and the like are curved in an arch shape in a side view, so that a belt (6) passing therethrough is curved upward and an arch-shaped curved traveling portion (A), and as shown in FIG. 16) is disposed on the upper side, from which the transported object (15) is dropped onto the belt (6). The trough converter (9) at the start end side of the forward path (6a) of the belt (6) Belt (6) and belt support
(7) Air outlet (20) in the area where the contact pressure with (10) is high
An air inlet pipe (21) having a tip (21a) directed upstream (to the left in FIG. 6) of the flow of compressed air in the air duct (18).
Is connected.

In the present embodiment, the air introduction pipe (21)
As shown in FIG. 7, an air introduction part (21b) parallel to the flow of compressed air in the air duct (18) and a guide part which is bent almost at a right angle from the base end and reaches the air outlet (20). (21c)
It consists of

Thus, the air inlet pipe (20)
By connecting (21), compressed air can be ejected from the air outlet (20) with a pressure obtained by adding the dynamic pressure due to the flow of compressed air to the static pressure in the air duct (18). The flow velocity of the air ejected from the outlet (20) is
Like other air outlets (20) to which (21) is not connected, it can be somewhat increased compared to the case where only static pressure in air duct (18) blows out.

The extent of the increase depends on the static pressure of the compressed air in the air duct (18), the flow velocity flowing therethrough, and the air introduction pipe.
Although it depends on the shape and dimensions of (21), the air introduction pipe (2
It has been confirmed by experiments that although the method 1) is not provided, it can be relatively easily increased if it is about 30 to 40%.

As described above, the air introduction pipe (21) is connected to the air outlet (20) of the belt support (7) in the arch-shaped curved traveling portion (A) of the belt (6) and the chute ( 16), the air levitation force of the belt (6) in those portions is locally increased by connecting to the air blowing holes (20) and the like of the belt support (10) below the belt support (10). Belt support (7) (10)
Can be prevented beforehand.

In particular, as shown in FIG. 8, three rows of air blowing holes (20) are provided in the belt support (10) below the chute (16), and an air introducing pipe (21) is connected to each of them. For example, the belt (6) can be lifted strongly without losing the load when the object (15) is dropped from the chute (16) onto the belt (6).

An air outlet (20) for connecting an air inlet pipe (21).
Is not limited to only the above
(6) Air blowing holes in the area where the contact pressure between the belt support and the
Connection may be made to (20) as needed.

Further, the shape of the air introduction pipe (21) is not limited to the above-mentioned one. For example, as shown in an air introduction pipe (22) shown in FIG. The air introduction pipe shown in FIG.
As shown in (23), the air blow hole (20) may have a shape that is curved in a substantially quarter-arc shape toward the upstream side of the flow of the compressed air as a whole, or the tip portion may be expanded in a divergent shape. It may be opened. Note that reference numeral (22a) in FIG.
Is a tip similar to the tip of the air introduction pipe (21) described above, (2
2b) is an air introduction part.

Further, the belt supporting member may have a gutter shape,
The belt (6) may be run as a flat plate, or the belt (6) may be formed in a tubular shape as described above.
(6) may be rolled up to a complete tubular shape and run as a so-called pipe conveyor.

[0030]

According to the first aspect of the present invention, since the air introduction pipe is connected to one of the air outlets, the flow velocity of the compressed air ejected from the air outlet is reduced.
It can be increased individually than others, and the belt levitation force at that portion can be locally increased.

Therefore, by connecting the air introduction pipe to the air blowing hole of the portion where the contact pressure between the belt and the belt supporting member is high, the belt floating force at that portion is reduced. By locally increasing, it is possible to prevent the belt from coming into contact with the belt support material in that part, and increase in running resistance due to such belt contact,
The accompanying increase in the load on the belt driving means can be controlled.

According to the third aspect of the present invention, the contact between the belt and the belt support in the arched curved traveling portion of the belt where the contact pressure between the belt and the belt support becomes large can be effectively prevented. .

According to the fourth aspect of the present invention, the belt can be lifted strongly without losing the load when an object is dropped from the chute onto the belt.

According to the fifth aspect of the present invention, by increasing the length of the air introduction section, the dynamic pressure of the compressed air flowing through the air duct can be sufficiently taken in, and the flow velocity of the compressed air ejected from the air outlet can be increased. it can.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional plan view taken along line II-II in FIG.

FIG. 3 is a vertical sectional front view as viewed from III-III in FIG. 1;

FIG. 4 is an enlarged perspective view of a main part.

FIG. 5 is an enlarged vertical sectional front view of a main part.

FIG. 6 is an enlarged perspective view of an upwardly convex curved traveling portion of the belt.

7 is an enlarged vertical sectional side view of a main part of FIG. 6;

FIG. 8 is an enlarged vertical sectional front view of a chute disposition portion.

FIG. 9 is a vertical sectional side view similar to FIG. 7, showing a modification of the air introduction pipe.

FIG. 10 is a vertical sectional side view similar to FIG. 7, showing another modified example of the air introduction pipe.

[Explanation of symbols]

 (1) Frame (2) (3) Shaft (4) Head pulley (5) Tail pulley (6) Belt (6a) Forward belt (6b) Return belt (7) (8) Belt support (9) Trough converter ( (10) (11) Belt support material (12) Trough conversion part (13) (14) Guide roller (15) Workpiece (16) Chute (17) Load receiving hopper (18) (19) Air duct (20) Air outlet (21) (22) (23) Air introduction pipe (21a) (22a) (23a) Tip (21b) (22b) Air introduction part (21c) (22c) Guide part (A) Arch-shaped curved traveling part

Claims (5)

[Claims] 1. A belt supporting member is disposed close to at least a part of an endless belt wound around a pair of pulleys, and connected to a compressed air source below the belt supporting member. An air duct is provided, and compressed air in the air duct is blown toward the belt from an air blowing hole formed in the belt support so as to communicate with the air duct, so that the belt floats above the belt support and travels. In the air levitation type belt conveyor device, the air introduction pipe is connected to any one of the air blowing holes, the leading end of which is connected to the upstream side of the flow of the compressed air in the air duct. Levitation type belt conveyor device. 2. The air levitation type belt conveyor device according to claim 1, wherein an air introduction pipe is connected to an air blowing hole in a portion where a contact pressure between the belt and the belt supporting member is high. 3. The air levitation type belt conveyor device according to claim 1, wherein an air introduction pipe is connected to an air blowing hole provided in the belt support member in the arcuate curved traveling portion of the belt. 4. A belt according to claim 1, wherein a chute is disposed above a start end of the outward path of the belt, and an air introduction pipe is connected to an air blowing hole provided in the belt support below the chute. Levitation type belt conveyor equipment. 5. The air introduction pipe according to claim 1, wherein the air introduction pipe comprises an air introduction section parallel to the flow of the compressed air in the air duct, and a guide section extending from the base end to the air outlet. Air floating type belt conveyor device.