JPH07239116A - Refuse supplying apparatus for refuse incinerating furnace - Google Patents

Abstract

PURPOSE:To obtain a refuse supplying apparatus for a refuse incinerating furnace which can rapidly detect a bridge by providing a contact type detector for detecting presence or absence of refuse on a pushing surface of a pusher provided at a bottom of a refuse introducing hopper. CONSTITUTION:A lower pushing surface 22 protruding from an upper pushing surface 21 for pushing out refuse toward a furnace body is formed at a front part of a pusher 6. Contact type detectors 24, 25, 26 for detecting presence or absence of the refuse are arranged laterally of the pusher 6 on the surface 22. The detectors 24, 25, 26 respectively have limit switches 30 which are closed by retreating or introducing a detecting rod 28 telescopically mounted on the surface 22. If a bridge is generated, the switches 30 are not closed even if the pusher 5 is retreated or introduced, and hence no detection signal is generated, thereby discovering generation of the bridge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse feeding device for feeding refuse thrown into a refuse throwing hopper into a refuse incinerator body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a waste injecting hopper 2 is installed in a furnace body 1 of a waste incinerator, and a waste supplying device 3 is provided at the bottom of the waste injecting hopper 2. The refuse supply device 3 is composed of a pusher 6 that is arranged so as to be able to move out and out and pushes out the refuse 4 from the refuse input hopper 2 onto the grate 5 of the furnace body 1, and a cylinder device 7 that reciprocates the pusher 6. ing. The front surface of the pusher 6 is formed as an extrusion surface 8 that pushes out the dust 4.

According to this, the dust 4 thrown in from the dust throwing hopper 2 falls inside and reaches the bottom.
After that, the piston rod 9 of the cylinder device 7 extends and the pusher 6 projects to the furnace body 1 side, and the pusher 6 pushes the dust 4 from the dust input hopper 2 onto the grate 5 by the pushing surface 8 thereof. After the extrusion, the piston rod 9 is shortened, the pusher 6 is retracted, and the pusher 6 is repeatedly protruded and retracted a plurality of times. As a result, the dust 4 is supplied onto the grate 5 from within the dust input hopper 2.

[0004]

However, in the above-mentioned conventional type, although the pusher 6 is operating, the dust 4 causes a bridge in the dust throwing hopper 2 as shown by A in FIG. There were times when it happened. The generation of such a bridge causes the waste 4 into the waste input hopper 2.
Judgment was made based on the decrease of the input amount and the decrease of furnace temperature, but there was a problem that the detection of the bridge and its response were delayed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a refuse supply device in a refuse incinerator which can detect a bridge quickly.

[0006]

In order to solve the above-mentioned problems, a refuse supply device for a refuse incinerator according to the present invention is disposed at the bottom of a refuse input hopper installed in the incinerator body so as to be able to move in and out. A pusher that pushes out from the dust input hopper onto the grate in the incinerator body, and a drive device that moves this pusher back and forth, and the push-out surface of the pusher has a contact-type detection device that detects the presence or absence of dust. It is provided.

[0007]

[Advantage] According to the above-mentioned structure, after the dust is thrown into the dust throwing hopper, the driving device is driven so that the pusher protrudes toward the incinerator body side, and the pusher pushes the dust from the dust throwing hopper to the fire inside the furnace body. Extrude on the grid. At this time, the detection device contacts the dust at the bottom of the dust input hopper to detect this dust.

Further, when the dust causes a bridge in the dust input hopper, a cavity is formed in front of the pushing surface of the pusher, so that even if the pusher protrudes toward the main body of the incinerator, the detector does not contact the dust. It will not be detected. By not detecting the detection device in this way, it was found that the dust did not reach the front of the pusher's extrusion surface, and it was possible to quickly detect the occurrence of a bridge in the dust input hopper. , Can respond early.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same members as those of the related art are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 1 to 3, at the front of the pusher 6, an upper extruding surface 21 for pushing out the dust 4 toward the furnace body 1, and a portion projecting more toward the furnace body 1 than the upper extruding surface 21. A lower extruding surface 22 and a horizontal surface 23 communicating with the lower part of the upper extruding surface 21 and the upper part of the lower extruding surface 22 are formed.
The lower extruding surface 22 is provided with a contact-type first detecting device 24, a second detecting device 25, and a third detecting device 26 for detecting the presence or absence of dust. These detectors 24, 25 and 26 are arranged in the width direction of the pusher 6 and have the same structure.

That is, each of the detection devices 24, 25 and 26 is a detection rod 28 which is attached to the lower extruding surface 22 so as to be retractable.
And a coil spring 29 that biases the detection rod 28 in the protruding direction.
And a limit switch that is turned on when the detection rod 28 retreats.
It is composed of 30 and. The detection rod 28 is the lower extrusion surface.
The detection rod 28 is inserted through the boss member 31 provided inside 22.
The rear end portion is inserted into a support plate 32 that hangs inside the horizontal surface 23. A retaining ring 33 is attached to the middle portion of the detection rod 28 so as to come into and out of contact with the rear end of the boss member 31 as the detection rod 28 moves back and forth. A striker 35 that comes into contact with the sensing protrusion 34 of the limit switch 30 to turn on the limit switch 30 is provided. The coil spring 29 is externally fitted to the detection rod 28,
It is attached between the retaining ring 33 and the support plate 32. The limit switch 30 is mounted inside the bottom surface of the pusher 6.

A bridge eliminating device 37 for eliminating the bridge of dust is provided in the middle of the dust input hopper 2. The bridge eliminating device 37 is a lateral support shaft 38 attached to the inner surface of the dust throwing hopper 2 and an upper end of the support shaft 38 connected to the support shaft 38 so that the bridge 38 can swing about the support shaft 38 in the hopper 2. It is composed of a moving plate 39 and a cylinder device 40 for rocking the rocking plate 39.

As shown in the block diagram of FIG. 4, an alarm device 41 is provided in the control room of the refuse incinerator to notify the occurrence of a bridge.
And a control device 42 that outputs an operation signal to the alarm device 41 and the bridge eliminating device 37 based on the detection signals of the detection devices 24, 25, and 26. The control device 42 includes
A sensor system including the first detecting device 24, the second detecting device 25, and the third detecting device 26, and a drive system including the driving unit 45 of the pusher 6, the driving unit 46 of the bridge eliminating device 37, and the alarm device 41. It is connected and outputs a drive signal to the drive system according to the detection signal input from the sensor system.

The operation of the above configuration will be described below with reference to the flowcharts of FIGS. 5 and 6. First, after the waste 4 is put into the waste input hopper 2, the pusher 6
It is determined whether or not is projected (step 1). When the piston rod 9 of the cylinder device 7 extends and the pusher 6 projects, the position detection sensor (not shown) or the like detects the projection of the pusher 6, and then the limit switch 30 of the first detection device 24 turns on. It is judged whether it has been done (step 2). That is, when the pusher 6 is pushed out and the dust 4 is pushed out of the dust input hopper 2 onto the grate 5 by the upper extrusion surface 21 and the lower extrusion surface 22, as shown by the phantom line in FIG. Lower extrusion surface 22 pushed by 4
The striker 35 moves and the sensing protrusion 34
The limit switch 30 of the first detection device 24 is turned on. Then, it is determined whether the pusher 6 has retreated (step 3). When the piston rod 9 of the cylinder device 7 is shortened and the pusher 6 is retracted, the first detection device 24
It is determined whether the limit switch 30 of is turned off (step 4). That is, as the pusher 6 retreats,
As shown by the solid line, the detection rod 28 projects toward the lower pushing surface 22 by the urging force of the coil spring 29, and the striker 35
Moves away from the sensing protrusion 34, and the limit switch 30 of the first detection device 24 is turned off. After that, the procedure returns to the above (step 1).

If the limit switch 30 of the first detecting device 24 remains ON in the above (step 4), it is determined that the first detecting device 24 is abnormal (step 5), and the abnormality indicating lamp ( (Not shown) or the like is displayed.

Further, as shown in FIG. 1A, when the dust 4 causes a bridge in the dust input hopper 2, the dust 4 does not reach the front of the lower extruding surface 22 of the pusher 6, and therefore the above ( In step 2), the limit switch 30 of the first detection device 24 remains off, and it is determined that the first detection device 24 has detected the bridge (step 6). After that, similarly, it is determined whether the second detecting device 25 detects the bridge (step 7), and when the second detecting device 25 also detects the bridge (that is, at least the first detecting device 24 and the second detecting device 25 are detected). If the bridge is detected), the alarm device 41 is activated (step 8) and the bridge eliminating device 37 is activated (step 9). As a result, the occurrence of the bridge is promptly notified, and the piston rod 43 of the cylinder device 40 moves back and forth to swing the swing plate 39, as shown in FIG. Therefore, the dust 4 forming the bridge in the dust input hopper 2 is forcibly dropped to the bottom of the dust input hopper 2 and the bridge is eliminated early.

Further, in the above (step 7), the second detection device is used.
If 25 does not detect the bridge, it is judged whether the third detecting device 26 detects the bridge (step 10), and if the third detecting device 26 detects the bridge (that is, the first detecting device 24 and the third detecting device 24). If the detection device 26 detects a bridge), the alarm device 41 is activated (step 8) and the bridge elimination device 37 is activated (step 9).

Further, if the third detecting device 26 does not detect the bridge in the above (step 10) (that is, if the second detecting device 25 and the third detecting device 26 do not detect the bridge), 1 It is judged that the detection device 24 is abnormal (step
11) Display an abnormality indicator lamp (not shown) in the control room.

When the pusher 6 projects in the above (step 1), the logic of the second detecting device 25 and the third detecting device 26 is developed in the (step 12).
The logics of the second detection device 25 and the third detection device 26 are the same as the logics of the first detection device 24 (step 2) to (step 11), respectively. The abnormality of 25 and the abnormality of the third detection device 26 can be determined.

FIG. 7 shows the pusher 6 moving in and out and each detecting device.
It is a graph showing a comparison with ON / OFF signals of the limit switches 30 of 24, 25 and 26. When the bridge does not occur, the limit switch 30 is turned on and off by the pusher 6 moving in and out. 44 generated controller 42
Sent to.

When a bridge is generated, the limit switch 30 is not turned on even if the pusher 6 moves back and forth, so that the detection signal 44 is not generated and the occurrence of the bridge is detected.

As another embodiment of the present invention, the pressure of the dust 4 at the bottom of the dust throwing hopper 2 is detected by each of the detecting devices 24, 2.
It is possible to detect at 5 and 26. That is, as shown in FIG. 3, the tip end surface of the detection rod 28 of each of the detection devices 24, 25, and 26 is used as a pressure receiving portion 47, and the pressure of the dust 4 loaded on the pressure receiving portion 47 causes the detection rod 28 to move back and forth. , The bridge is detected quickly.

In each of the above embodiments, the first detection device 24, the second detection device 25, and the third detection device 26 are attached to the pusher 6, but the number is not limited to three, and the size of the pusher 6 may be changed. The number of detection devices may be increased or decreased accordingly.

[0024]

As described above, according to the present invention, after the dust is thrown into the dust throwing hopper, the driving device is driven so that the pusher projects toward the main body of the incinerator, and the pusher throws the dust at the pushing surface thereof. Push out from the hopper onto the grate in the furnace body. At this time, the detection device contacts the dust at the bottom of the dust input hopper to detect this dust.

Further, when the dust causes a bridge in the dust feeding hopper, a cavity is formed in front of the pushing surface of the pusher, so that even if the pusher projects toward the incinerator body side, the detection device does not contact the dust. It will not be detected. By not detecting the detection device in this way, it was found that dust did not reach the front of the pusher's extrusion surface, and it was possible to quickly detect the occurrence of a bridge in the dust input hopper. . Therefore, after the occurrence of the bridge is detected, it is possible to take countermeasures for releasing the bridge early.

[Brief description of drawings]

FIG. 1 is a side view of a refuse supply device according to an embodiment of the present invention.

FIG. 2 is a front view of the waste supply device.

FIG. 3 is a side view of the detection device.

FIG. 4 is a block diagram showing a control system of the dust supply device.

FIG. 5 is a flowchart showing a process from detection of a bridge to cancellation of the bridge.

FIG. 6 is a flowchart showing a process from detection of a bridge to cancellation of the bridge.

FIG. 7 is a graph in which the pusher retracts and the detection signal of the detection device are compared.

FIG. 8 is a side view of a conventional refuse supply device.

[Explanation of symbols]

 1 Furnace Main Body 2 Waste Input Hopper 3 Waste Supply Device 4 Waste 5 Grate 6 Pusher 7 Cylinder Device (Drive Device) 22 Lower Extrusion Surface 24 1st Detection Device 25 2nd Detection Device 26 3rd Detection Device

Claims (1)

[Claims] 1. A pusher, which is arranged at the bottom of a refuse input hopper installed in the incinerator main body so as to be able to move out and out, and pushes out the waste from the waste input hopper onto a grate in the incinerator main body, and the pusher A refuse supply device for a refuse incinerator, comprising a drive device for retracting the contact, and a contact-type detection device for detecting the presence or absence of dust on the pushing surface of the pusher.