JP2000053219A - Clogging detector and coal shoot provided with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clogging detector for a coal shoot which hardly operates incorrectly, adjusts the sensitivity, and improve the operativity in maintenance. SOLUTION: A clogging detector 20 for a coal shoot is provided with a shroud 21 for partitioning a clogging detecting space 25 inside the coal shoot, a coal flow hole 24 provided in the shroud 21, a rotational movement main body 22 arranged in the detecting space 25 so as to move rotationally, and a switch 23 which is operated by the rotational movement of the rotational movement main body 22, when the coal accumulated in the rotational movement main body 22 via the coal flow hole 24 reaches a prescribed weight. A sensitivity adjustment member 31 is preferably attached to the rotational movement main body 22 to adjust the prescribed weight of the coal necessary for rotationally moving the rotational movement main body 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal chute for conveying coal, and more particularly to a clogging detection mechanism for detecting clogging when coal is clogged in the coal chute.

[0002]

2. Description of the Related Art A coal chute is transported from an upstream belt conveyor for transporting coal as a raw material to a downstream belt conveyor disposed below, for example, a roller mill for crushing lime. This is a chute that drops coal.

[0003] Coal is conveyed by a belt conveyor on the upstream side, falls from the belt conveyor in a coal chute, and is conveyed to the next conveyor. Coal as this raw material has a high humidity and Therefore, it adheres to seams and the like on the wall surface constituting the coal chute. The deposited coal grows rapidly and eventually causes the coal chute to become clogged.

[0004] If coal is clogged at the coal chute, especially at the top of the coal chute, the pulleys of the belt conveyor located inside the coal chute may be damaged, causing a large amount of damage. Therefore, a clogging detection device is provided to detect a clogging of the coal chute at an early stage. If clogging can be detected early by this clogging detection device, maintenance can be performed to discharge the clogged coal.

FIG. 6 is a configuration diagram showing a main part of a conventional clogging detection device 4. As shown in FIG. In FIG. 6 (A), a frame portion 2f protruding from the frame 2 of the lime chute is formed so as to open its inside toward the space where the coal falls,
The cylindrical portion 40 of the clogging detecting device 4 is hung down by a chain 43 from the upper inner wall of the frame portion 2f. Tube part 4
0 has electrical contacts 41a at its upper and lower portions, respectively.
And 41b are attached. Further, inside the cylindrical portion 40, only the lower electrical contact 41b is contacted,
Mercury 42 is sealed.

[0006] In the conventional clogging detection device 4 configured as described above, a joint (not shown) is provided as shown in FIG.
When the coal 6 attached to the cylinder grows and pushes up the lower part of the cylinder 40, and the cylinder 40 tilts, the mercury 42 sealed in the cylinder 40 comes into contact with both of the two electrical contacts 41a and 41b. The connection state is established, and the clogging of the coal 6 can be detected.

[0007]

However, the projecting frame portion 2f of the frame 2 is open to the space where the coal 6 falls.
Further, since the cylindrical portion 40 is merely hung by the chain 43 on the frame portion 2f, even if the coal chute is not clogged, the coal 6 falling from the belt conveyer is not used.
Accidentally collides with the cylindrical portion 40, the cylindrical portion 40 is tilted, and the two electric contacts 41a and 41
b is in a conductive state, and there is a problem that the clogging of the coal chute is erroneously detected.

Further, since the sensitivity adjustment of how much the cylinder portion 40 is tilted and the electrical contacts 41a and 41b become conductive is determined by the set position of the electrical contacts at the time of manufacture, it is not necessary to adjust thereafter. There was also a problem that it was not possible.

Furthermore, since coal and the like are heavy in weight, the clogging detection device itself must be made firmly. Therefore, the weight of the clogging detection device itself also increases, so that it is desired to improve operability during maintenance. Was rare.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a clogging detection device for a coal chute which can be adjusted in sensitivity without malfunction. It is the main purpose.

[0011]

According to one aspect of the present invention, a clogging detection device comprises:
An enclosure defining a clogging detection space therein, a coal inflow hole provided in the enclosure, a rotating main body rotatably disposed in the detection space, and the coal inflow hole. A switch that is activated by the rotation of the rotating main body when the coal accumulated in the rotating main body reaches a predetermined weight.

[0012] In the clogging detection device, it is preferable that a sensitivity adjusting member is attached to the rotating main body in order to adjust the predetermined weight of the coal required for rotating the rotating main body.

According to another aspect of the present invention, a space for coal falling is defined and surrounds a pulley supporting an upstream belt conveyor for coal inflow at an upper portion, and extends downward through a work floor. In the coal chute having a frame guiding the coal to the downstream belt conveyor for coal discharge, the position below the pulley of the upstream belt conveyor located in the coal chute and above the work floor The frame is provided with the above-described clogging detection device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 4 is a partial perspective view showing the upper portion of the coal chute 1, and the outline of the coal chute 1 will be described with reference to FIG. In FIG. 4, a coal chute 1 includes a frame 2 that defines a space in which coal is dropped. The frame 2 transports coal to a roller mill through a box-shaped portion 2a having an opening 2d for receiving a belt conveyor 3 for transporting coal, a funnel portion 2b tapered downward, and a work floor 10. And a columnar portion 2c for guiding the coal to a downstream belt conveyor (not shown). The columnar portion 2c may be bifurcated below so as to guide the coal to a plurality of belt conveyors depending on the application. The pulley 5 supporting the belt of the belt conveyor 3 is rotatably mounted in the frame 2 by a known method.

The jam detecting device 20 includes a belt conveyor 3
Provided on the wall surface adjacent to the wall having the opening 2d. The clogging detection device 20 is mounted above the work floor 10 and at a position where maintenance can be performed by opening the lid 26. Next, the clogging detection device 20 will be described in detail.

FIG. 1 is a block diagram showing a main part of a clogging detection device 20 for a coal chute according to the present invention. In this figure, the clogging detection device 20 includes a clogging detection space 25.
, A rotating body 22 that rotates according to the weight of the coal, and a switch 23 that comes into contact with the rotating body 22 and detects clogging of the coal.

The clogging detection space 25 is defined so as to surround the inward opening of the projecting frame portion 19 projecting outward from the frame body 2 with the surrounding plate 21. The surrounding plate 21 is provided with a coal inflow hole 24 so that coal can flow in from a coal falling space defined inside the frame 2. A lid 26 is attached to the projecting frame 19 from outside by a plurality of screws 27.

As shown in detail in FIG. 2, inside the space 25 for detecting clogging, a pocket receiving portion 28 for receiving coal is provided.
And a back plate 29 attached at a predetermined angle to the pocket receiving portion 28, the turning body 22 is rotatably disposed. A support shaft 30 protrudes outward from both sides between the pocket receiving portion 28 and the back plate 29, and the rotation main body 22 rotates around the support shaft 30. The rotation of the rotating main body 22 is controlled by a known balance holding mechanism, and is prevented from rotating until a predetermined weight of coal is accumulated in the pocket receiving portion 28 in order to prevent malfunction.

The pocket receiving portion 28 is disposed so as to be close to the coal inflow hole 24 of the surrounding plate 21 and
Coal which enters the clogging detection space 25 through 4 is reliably received. Further, a weight plate 31 for sensitivity adjustment is attached to the pocket receiving portion 28. In addition, since the coal is heavy, the clogging detection device 20 itself must be made firmly. In this embodiment, the size of the coal is a mandarin box size, so that the internal rotating main body 22 has a large size. The weight is also quite heavy.

A switch 23 is disposed above the rotating main body 22 in the clogging detection space 25 so that the rotating main body 22 rotates and the back plate 29 contacts when the back plate 29 rotates by a predetermined amount. .

Next, the process of coal clogging in the coal chute and the detection of clogging by the clogging detection device will be described with reference to FIGS. The coal is conveyed by the belt conveyor 3, falls from the belt conveyor 3 in the box-shaped portion 2a of the coal chute 1, passes through the funnel portion 2b and the columnar portion 2c, and is conveyed to the next conveyor (see arrow).

As described above, since coal has a high humidity and moisture and is clay-like, the coal 6 adheres to the joint 2e between the funnel 2b and the column 2c. As shown in FIG. 5, when coal 6 adheres to the upper portion of the coal chute 1, the adhered coal 6 gradually grows and the enclosing plate 2
It reaches the same height as the one coal inflow hole 24 or slightly higher. When the coal 6 grows to this position, the coal flows through the coal inflow hole 24 of the surrounding plate 21 and overflows into the pocket receiving portion 28 of the rotating main body 22 from the space for dropping coal. At this time, since the pocket receiving portion 28 is located close to the coal inflow hole 24, the coal 6 reliably flows into the pocket receiving portion 28. Further, the coal 6 falling from the belt conveyor does not directly collide with the pocket receiving portion 28 due to the presence of the surrounding plate 21, so that the coal 6 always flows through the coal inflow hole 24 and does not accidentally enter.

When the amount of coal flowing into the pocket receiving portion 28 reaches a predetermined amount, the rotating body 22 rotates about the support shaft 31 to move the back plate 29 in the direction of the arrow X, and the switch 23 and the back plate are moved. 29, and the clogging of the coal chute is detected.

When the clogging detection device 20 detects the clogging of the coal, the operation of the coal chute is temporarily stopped, and cleaning and maintenance are performed. This clogging frequency is usually about once a year, but if freezing or water leakage occurs, it may occur about once every two to three weeks, so frequent maintenance is required.

The maintenance of the clogging detecting device 20 is performed as follows. The work floor 10 (see FIG. 4) is provided at a position where the clogging detection device 20 can be easily maintained. Therefore, the operator can open the lid 26 of the clogging detection device 20 from the work floor 10 and remove the coal 6 scattered inside the rotating main body 22 and the space 25 for clogging detection. Such a positional relationship between the work floor 10 and the clog detection device 20 improves operability during maintenance. In addition, since the rotation main body 22 is rotatable, it is possible to easily remove coal.

Next, adjustment of the rotation sensitivity of the rotation main body 22 will be described. First, as in the case of the maintenance described above, the lid 26 is removed from the projecting frame portion 19 of the frame 2, and then the weight of the weight plate 31 provided in the pocket receiving portion 28 of the rotating main body 22 is adjusted. Here, if the weight plate 31 is made heavy, it rotates even if the amount of coal accumulated in the pocket receiving portion 28 is small, so that the sensitivity is improved. If the weight plate 31 is made light, a large amount of coal is made to rotate. , The sensitivity becomes worse. Thus, the rotation sensitivity of the rotation main body 22 can be easily adjusted.

In the above-described embodiment, the coal inflow hole 24 is provided in the integrally formed enclosure plate 21. However, the upper enclosure plate and the separately formed upper enclosure plate so as to define the coal inflow hole in the center. A lower surrounding plate may be provided. Further, the rotating main body 22 may be formed integrally, or the pocket receiving portion and the back plate may be formed separately.

In this embodiment, the back plate 29
Although the switch 23 that comes into contact with the switch 23 is mounted above the clogging detection space 25, the mounting position of the switch 23 can be set arbitrarily as long as it is within the clogging detection space 25. A back plate may be attached to the rotating body so as to correspond to the position of the switch 23.

Further, in order to detect clogging, the back plate 2
9 and the switch 23 are used, but the present invention is not limited to this embodiment. For example, a photoelectric sensor is provided,
By detecting that the back plate has passed a predetermined position, it is possible to detect a blockage.

As the balance holding mechanism for controlling the rotation of the rotating main body 22, any known method may be used.
For example, a clutch that maintains the engagement until a predetermined load is applied to the support shaft 31 may be attached, or the load may be supported by a torsion spring. Further, the pocket receiving portion 28 of the rotating main body 22 may be hung from above with a thread, chain, spring, or the like that can withstand a predetermined load. However, the rotating body 22
Because of its heavy weight, it is limited to those that can maintain the balance.

In this embodiment, the coal chute 1 is formed so as to extend downward through the work floor 10. However, in order to perform maintenance of the clogging detection device 20, an operator can approach the coal chute 1. If it has
Any structure such as a temporary scaffold may be used.

Further, in this embodiment, since the damage of the pulley 5 of the belt conveyor 3 due to coal clogging causes the greatest damage, the clogging detection device 20 is disposed above the coal chute 1, but the clogging detection space is provided. 25 is the enclosure 2
5 and is not directly hit by the coal 6, the installation location is not limited to this, but below the opening 2d for the belt conveyor 3 and above the funnel 2b. Then, it can be installed at any place.

The clogging detection space 25 is defined using the space in the protruding frame portion 19 protruding outward from the frame 2, but a lid for opening and closing is directly attached to the frame 2 itself. Thus, the clogging detection space may be defined by disposing the surrounding plate 21 directly on the inner wall surface of the frame 2.

[0035]

According to the first aspect of the present invention, the clogging detection device comprises: a shroud defining a clogging detection space inside the coal chute; a coal inflow hole provided in the shroud; A rotatable main body rotatably disposed in the detection space, and activated by rotation of the rotatable main body when the coal accumulated in the rotatable main body via the coal inflow hole reaches a predetermined weight. The switch and the switch prevent the coal from directly colliding with the clogging detection device due to the shroud defining the clogging detection space, and enter the rotating main body through the coal inflow hole and accumulate a predetermined weight of coal. In this case, the rotating main body is turned to operate the switch to detect the clogging, so that there is no malfunction.

According to the second aspect of the present invention, the sensitivity adjusting member is attached to the rotating main body in order to adjust the predetermined weight of the coal required for rotating the rotating main body. The detection sensitivity of the clogging detection device can be adjusted.

According to the third aspect of the present invention, a space for dropping coal is defined, a pulley supporting an upstream belt conveyor for coal inflow is surrounded at an upper portion, and extends through a work floor, In a coal chute having a frame for guiding coal to a downstream belt conveyor for coal transport at a lower portion, a position below the pulley of the upstream belt conveyor located in the coal chute and a position of the work floor. 3. The frame according to claim 1 or 2, wherein the frame is in an upper position.
Since the jam detector described in (1) is attached, jam can be reliably detected by the jam detector, the pulley supporting the belt conveyor is not damaged, and maintenance costs can be reduced. Further, since the clogging detection device is accessible from the work floor, maintenance such as sensitivity adjustment and coal removal of the clogging detection device can be easily performed, and operability is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of a clogging detection device for a coal chute according to the present invention.

FIG. 2 is a perspective view showing details of a rotating main body constituting the clogging detection device.

FIG. 3 is a diagram illustrating an operation state of a clogging detection device when coal is clogged in a coal chute.

FIG. 4 is a perspective view showing an outline of a coal chute.

FIG. 5 is a schematic diagram showing a state in which coal is clogged in a coal chute.

6A and 6B are configuration diagrams illustrating a main part of a conventional clogging detection device, in which FIG. 6A illustrates a normal state, and FIG. 6B illustrates an operation state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coal chute, 2 ... Frame, 2a ... Box-shaped part, 2b ... Funnel part, 2c ... Column-shaped part, 2d ... Opening, 2e ... Joint part, 2f
... projecting frame, 3 ... belt conveyor, 4 ... jam detector, 5 ... pulley, 6 ... coal, 10 ... work floor, 19 ... projecting frame, 20 ... jam detector, 21 ... enclosure, 22 ... rotation Main unit, 23 switch, 24 coal inlet hole, 25 clogging detection space, 26 lid, 27 screw, 28 pocket receiving part, 29 back plate, 30 support shaft, 31 weight plate, 40 ...
Tube part, 41a, 41b ... electric contact, 42 ... mercury, 43 ...
chain.

Claims (3)

[Claims] An enclosure that defines a clogging detection space therein; a coal inflow hole provided in the enclosure; a rotating main body rotatably disposed in the detection space; A clogging detection device comprising: a switch that is activated by rotation of the rotating main body when coal accumulated in the rotating main body via the coal inflow hole reaches a predetermined weight. 2. The clogging detection device according to claim 1, wherein a sensitivity adjusting member is attached to the rotating main body to adjust the predetermined weight of the coal required for rotating the rotating main body. 3. A coal falling space is defined and surrounds a pulley that supports an upstream belt conveyor for coal inflow at the top and extends through the work floor, and a downstream downstream coal discharge at the bottom. 2. A coal chute having a frame for guiding coal to a belt conveyor, wherein the frame is attached to the frame at a position below the pulley of the upstream belt conveyor located in the coal chute and above the work floor. Or a coal chute provided with the clogging detection device according to claim 2.