JP2012171742A - Pyrite discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pyrite discharge device that has simple constitution and is a dry type, and low in device cost and running cost.SOLUTION: The pyrite discharge device includes: a hopper 1 which stores pyrite 2; a pyrite discharge duct 3 linked to an upper end of the hopper; a pyrite cutout opening 7 which is provided in a lower part of the hopper and opened and closed with an opening and closing door 8; a gate valve 4 which is provided in the pyrite discharge duct and opened and closed with a gate cylinder 5; a lock mechanism 11 which is driven by a lock cylinder 12 to lock/unlock the opening and closing door; and a driving circuit which applies and removes operating pressure to the gate cylinder and lock cylinder, respectively. The driving circuit is configured to lock/unlock the lock mechanism by the lock cylinder, corresponding to the opening and closing of the gate valve by the gate cylinder.

Description

  The present invention relates to a pyrite discharging apparatus that collects and stores pyrite that remains without being pulverized when coal is pulverized, and further discharges it outside the system.

  A pulverized coal burner using pulverized coal as a fuel is used for the coal-fired boiler. The pulverized coal burner is supplied with pulverized coal burned into fine powder by a pulverizer to the pulverized coal burner together with the conveying air. However, what cannot be pulverized during coal pulverization, that is, pyrite remains. Such pyrite is collected by the pyrite discharge device, temporarily stored in the pyrite discharge device, and further discharged out of the system.

  Conventionally, as shown in Patent Document 1, a pulverizer for pulverizing coal, that is, pyrite discharged from a pulverized coal mill, is temporarily stored in a hopper of a pyrite discharge device, and further cut out from the hopper with water to form a slurry. Was carried out.

  Since such a conventional pyrite discharge device is wet using water, the structure of the pyrite discharge device is complicated, and a water treatment facility is required, resulting in a large-scale facility, which increases the device cost and the running cost. There was a problem such as becoming higher.

JP-A-1-303229

  In view of such circumstances, the present invention provides a pyrite discharge device that has a simple configuration and is of a dry type and has low apparatus cost and low running cost.

  The present invention provides a hopper for storing pyrite, a pyrite discharge duct communicated with an upper end of the hopper, a pyrite cutout opening provided at a lower portion of the hopper and opened and closed by an open / close door, and a gate provided in the pyrite discharge duct. A gate valve that is opened and closed by a cylinder; a lock mechanism that is driven by a lock cylinder to lock / unlock the door; and a drive circuit that supplies and discharges operating pressure to and from the gate cylinder and the lock cylinder, respectively. The drive circuit relates to a pyrite discharge device configured to correspond to opening / closing of the gate valve by the gate cylinder and to lock / release the lock mechanism by the lock cylinder.

  The present invention also includes a pressure relief valve that releases the internal pressure in the hopper, a valve opening / closing cylinder that opens and closes the pressure relief valve, a first limit switch that operates at a stroke end of the gate valve closing operation of the gate cylinder, A second limit switch that operates in response to the pressure relief valve opening / closing operation of the valve opening / closing cylinder, and a driving pressure for unlocking the lock cylinder is supplied via the first limit switch, and the opening / closing door The unlocking of the gate valve is delayed with respect to the closing operation of the gate valve, the driving pressure for opening the gate valve is supplied via the second limit switch, and the opening operation of the gate valve is performed by the pressure. The present invention relates to a pyrite discharge device that is performed with a delay in the closing operation of the relief valve.

  According to the present invention, the driving pressure for opening the gate valve is branched, and the branched driving pressure is supplied as the driving pressure for closing the pressure relief valve and locking the lock cylinder. The opening operation is related to the pyrite discharging device which is performed after the locking operation of the locking mechanism.

  The present invention also relates to a pyrite discharge device, wherein the first limit switch and the second limit switch are mechanical switches whose flow paths are switched by cylinder operation.

  Further, according to the present invention, the drive circuit includes a delay unit, the delay unit delays the unlocking operation of the lock cylinder with respect to the gate valve closing operation of the gate cylinder, and prevents the lock cylinder from being locked. The present invention relates to a pyrite discharge device configured to delay the gate valve opening operation of the gate cylinder.

  Further, the present invention includes a pyrite unloading carriage provided so as to be able to travel under the pyrite cutout opening, and a traveling cylinder for traveling the pyrite unloading carriage, and the traveling cylinder has a pyrite receiving position by the drive circuit. The present invention relates to a pyrite discharge device that is driven to reciprocate between the pyrite carry-out position.

  According to the present invention, a hopper for storing pyrite, a pyrite discharge duct communicated with an upper end of the hopper, a pyrite cutout opening provided at a lower portion of the hopper and opened and closed by an open / close door, and provided in the pyrite discharge duct A gate valve that is opened and closed by a gate cylinder, a lock mechanism that is driven by a lock cylinder and locks / unlocks the door, and a drive circuit that supplies and discharges operating pressure to and from the gate cylinder and the lock cylinder, respectively. The drive circuit is adapted to open / close the gate valve by the gate cylinder and lock / release the lock mechanism by the lock cylinder, so that the pyrite can be stored and discharged dry. The gate valve can be opened and closed by the gate cylinder. Locking of the locking mechanism by said lock cylinder, a brief configuration is performed only by unlocking the running cost also exhibited an excellent effect that low.

It is the schematic of the pyrite discharge apparatus which concerns on the Example of this invention. It is a drive system figure of this pyrite discharge device. (A), (B), and (C) are operation | movement explanatory drawings in the case of discharging | emitting from the storage of pyrite in this pyrite discharge apparatus. (A), (B), and (C) are operation | movement explanatory drawings at the time of storing from the discharge of the pyrite in this pyrite discharge apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a pyrite discharging apparatus according to an embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a hopper for storing pyrite 2. A pyrite discharge duct 3 is communicated with the upper end of the hopper 1, and the pyrite discharge duct 3 is connected to a pulverized coal mill (not shown) so as to discharge the pyrite. A gate valve 4 is provided in the middle of the duct 3. The gate valve 4 is opened and closed by a gate cylinder 5. The gate cylinder 5 is provided with a first limit switch 6, and the first limit switch 6 is operated by the operation of the gate cylinder 5, for example, the movement of a cylinder rod, and the gate is moved through the movement of the cylinder rod. The open / close state of the valve 4 is detected by the first limit switch 6.

  A pyrite cutout opening 7 that opens in the horizontal direction is provided at the lower portion of the hopper 1. The pyrite cutout opening 7 is opened and closed by an opening / closing door 8. In the closed state, the pyrite cutout opening 7 is airtightly closed by the opening / closing door 8. It has become like that.

  The opening / closing door 8 is provided with an opening / closing handle 9, and the opening / closing door 8 is opened / closed by rotating the opening / closing handle 9. Further, the opening / closing door 8 is provided with a lock mechanism 11, which locks or unlocks the opening / closing door 8, restricts the opening / closing of the opening / closing door 8 by the opening / closing handle 9, and enables opening / closing. To do. The lock mechanism 11 is locked / released by a lock cylinder 12.

  Further, the position of the hopper 1 that does not interfere with the pyrite 2, for example, the upper surface thereof, a pressure detector 13 that detects the pressure in the hopper 1, and a storage level detection that detects the level of the pyrite 2 stored in the hopper 1. And a pressure relief valve 15 for releasing the air in the hopper 1 and reducing the internal pressure. The pressure relief valve 15 is opened and closed by a valve opening / closing cylinder 16. Similar to the gate cylinder 5, the valve opening / closing cylinder 16 is provided with a second limit switch 17 for detecting the operation state of the valve opening / closing cylinder 16, and the pressure relief valve is operated via the operation state of the valve opening / closing cylinder 16. 15 open / close states are detected.

  In the figure, 18 is an illumination window (illuminating device is omitted) for illuminating the inside of the hopper 1, and 19 is a viewing window for confirming the state of the pyrite 2 in the hopper 1. Further, the bottom surface of the hopper 1 is at an angle θ greater than the repose angle of the pyrite 2 so that the stored pyrite 2 moves toward the pyrite cutout 7 without staying.

  A pyrite unloading carriage 21 is provided below the pyrite cutout opening 7 so as to be able to travel. The pyrite unloading carriage 21 is connected to, for example, a traveling cylinder 22 and is set to reciprocate between the pyrite receiving position and the pyrite unloading position by the traveling cylinder 22.

  At the pyrite receiving position, when the open / close door 8 is opened, the cut out pyrite 2 is dropped onto the pyrite carrying carriage 21, and at the pyrite carrying position, a transport device outside the system, such as a dump truck, is provided. As a result, the pyrite 2 of the pyrite carrying cart 21 is discharged.

  The gate cylinder 5, the lock cylinder 12, and the traveling cylinder 22 are connected by a drive circuit 20 (see FIG. 2) that is an operating pressure supply / discharge circuit, and the drive circuit 20 includes the gate cylinder 5, the lock cylinder 12, and the A control valve 23 for controlling supply and discharge of air pressure (working pressure) to the traveling cylinder 22 is provided.

  By operating the control valve 23, the storage state of the pyrite 2 and the discharge state of the pyrite 2 of the drive circuit 20 are selected, and air pressure is supplied to and discharged from the gate cylinder 5, the lock cylinder 12, and the traveling cylinder 22. Thus, the gate cylinder 5, the lock cylinder 12, and the traveling cylinder 22 are each driven. However, for safety reasons, there are restrictions on the operation of the gate cylinder 5 and the lock cylinder 12. Thereby, the gate valve 4 and the open / close door 8 are simultaneously opened, and hot air from a pulverizer (not shown) is prevented from being ejected from the pyrite cutout opening 7.

  The first limit switch 6 and the second limit switch 17 are provided to further enhance safety.

  When the first limit switch 6 does not detect the closed state of the gate valve 4 and the cylinder rod does not reach the closing stroke end (stroke end), the lock cylinder 12 is not released. The drive circuit 20 for the cylinder is configured.

  Further, the second limit switch 17 has a cylinder driving circuit 20 so that the lock cylinder 12 is not released when the pressure relief valve 15 is not detected to be open, that is, when the internal pressure of the hopper 1 is high. It is configured.

  Hereinafter, the operation of the pyrite discharging apparatus will be described.

  When the pyrite 2 is stored in the hopper 1, the gate valve 4 is released, and the open / close door 8 is locked by the lock mechanism 11.

  When the storage level detector 14 detects that the pyrite 2 accumulated in the hopper 1 has reached a predetermined level, a warning light or the like on the operation panel or the like is turned on, and it is time for the operator to discharge the pyrite 2. Announce that.

  An operator operates the control valve 23 to drive the gate cylinder 5 and closes the gate valve 4. The closed state of the gate valve 4 is detected by the first limit switch 6. At the same time, the valve opening / closing cylinder 16 is driven, the pressure relief valve 15 is opened, and the high-pressure air in the hopper 1 is released from the pressure relief valve 15. The open state of the pressure relief valve 15 is detected by the second limit switch 17.

  Based on the detection of the open state of the gate valve 4 of the first limit switch 6 and the detection of the open state of the pressure relief valve 15 by the second limit switch 17, the lock cylinder 12 is driven to activate the lock mechanism 11. To release.

  Also, the operation of the control valve 23 causes the pyrite unloading carriage 21 to move to the pyrite receiving position in synchronization with the lock cylinder 12 being locked.

  The operator confirms that the pressure detected by the pressure detector 13, that is, the pressure inside the hopper 1 is normal, and operates the opening / closing handle 9 to open the opening / closing door 8. The pyrite 2 in the hopper 1 is dropped onto the pyrite carrying cart 21. When the pyrite 2 is loaded on the pyrite carrying cart 21, the open / close door 8 is closed.

  When the open / close door 8 is completely closed, the control valve 23 is operated to drive the lock cylinder 12 and lock the open / close door 8 by the lock mechanism 11.

  In conjunction with the drive of the lock cylinder 12, the traveling cylinder 22 operates, and the pyrite unloading carriage 21 moves to the pyrite unloading position. Further, the pressure relief valve 15 is closed by the valve opening / closing cylinder 16, the gate cylinder 5 is further driven, and the gate valve 4 is opened.

  A fluid pressure cylinder is used as the gate cylinder 5, the lock cylinder 12, the valve opening / closing cylinder 16, and the traveling cylinder 22 described above. Further, an air cylinder that can easily obtain a pressure fluid and can easily manage the pressure fluid is preferable.

  As described above, in this embodiment, water is not used for discharging the pyrite 2, and the pyrite 2 can be stored and discharged in a dry manner. Basically, the hopper 1, the gate valve 4 for opening and closing the pyrite discharge duct 3, and the opening and closing door 8 for opening and closing the pyrite cutout opening 7 are simply structured to be locked / released. Since the door 8 is locked / released by the lock mechanism 11 that operates in conjunction with the opening and closing of the gate valve 4, the safety is high. Further, since a cylinder is used as an operation source for driving the gate valve 4 and the lock mechanism 11, an inexpensive configuration can be achieved.

  Next, a specific configuration will be described with reference to FIG. 2 that are the same as those shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  The control valve 23 is connected to an air pressure source (not shown). By operating the lever 24 of the control valve 23, air pressure is alternatively supplied to the first air pressure path 25 and the second air pressure path 26. It is like. That is, air pressure is supplied to the first pneumatic path 25 at the first position 24 a of the lever 24, and air pressure is supplied to the second pneumatic path 26 at the second position 24 b of the lever 24. It is like.

  The first pneumatic passage 25 is branched into three, and the first pneumatic passage first branch 25a is connected to a port that locks the opening / closing door 8 of the lock cylinder 12, and the first pneumatic passage second branch 25b. Is connected to a port for closing the pressure relief valve 15 of the valve opening / closing cylinder 16, and the first pneumatic passage third branch 25 c opens the gate valve 4 of the gate cylinder 5 via the second limit switch 17. Connected to the port

  The second pneumatic path 26 is branched into two, the second pneumatic path first branch 26a is connected to a port for closing the gate valve 4 of the gate cylinder 5, and the second pneumatic path second branch 26b is The first limit switch 6 is connected to a port for opening the pressure relief valve 15 of the valve opening / closing cylinder 16 and to a port for releasing the lock of the lock cylinder 12.

  The first limit switch 6 is a so-called mechanical switch and functions as a switching valve for communicating / disconnecting the second pneumatic path second branch 26b. The first limit switch 6 always cuts the second pneumatic path second branch 26b. The rod displaces the spool of the first limit switch 6 at the movement of the rod of the gate cylinder 5, that is, the stroke end (stroke end) at the position where the gate valve 4 is closed, and the second pneumatic path second The branch 26b is connected.

  The second limit switch 17 is also a mechanical switch that functions as a switching valve, and the second limit switch 17 operates in response to the operation of the valve opening / closing cylinder 16. The pressure relief valve 15 is always in communication (the gate valve 4 is open and the pyrite 2 is stored) and the first pneumatic passage third branch 25c is in communication, and the valve opening / closing cylinder 16 is connected to the pressure relief valve 15. When the relief valve 15 is operated to be opened, the second limit switch 17 is actuated by the valve opening / closing cylinder 16 to cut the first pneumatic path third branch 25c.

  The first limit switch 6 and the second limit switch 17 may be limit switches that detect the operation of the gate cylinder 5 and the valve opening / closing cylinder 16 and generate an electrical signal.

  Hereafter, the operation | movement in the case of discharging | emitting pyrite from a pyrite storage state is demonstrated using FIG. 3 (A)-FIG.3 (C).

  The state where pyrite is stored in the hopper 1 is a state where the control valve 23 is in the first position 24a and the air pressure is supplied to the first air pressure path 25 (FIG. 3A). ).

  In a state where the pressure relief valve 15 is closed via the valve opening / closing cylinder 16 and the valve opening / closing cylinder 16 closes the pressure relief valve 15, the second limit switch 17 is connected to the first pneumatic path third. The branch 25c is communicated. Therefore, the gate cylinder 5 opens the gate valve 4. Further, the lock mechanism 11 is operated via the lock cylinder 12, and the open / close door 8 is locked.

  Next, when the control valve 23 is set to the second position 24b in order to discharge the pyrite 2, air pressure is supplied to the second air pressure passage 26. The gate cylinder 5 drives the gate valve 4 in the closing direction by supplying air pressure to the second air pressure path first branch 26a branched from the second air pressure path 26 (FIG. 3B). ). In this state, the second pneumatic path second branch 26b is disconnected. The lock cylinder 12 is continuously supplied with air pressure so as to maintain the lock.

  When the gate cylinder 5 completely closes the gate valve 4, the first limit switch 6 detects the closed state of the gate valve 4 and connects the second pneumatic path second branch 26b. When the second air pressure passage 26 communicates, air pressure is supplied to the valve opening / closing cylinder 16 and the lock cylinder 12, and the pressure relief valve 15 is opened via the valve opening / closing cylinder 16. The lock cylinder 12 is activated and the lock mechanism 11 unlocks the open / close door 8.

  Air pressure is supplied to the valve opening / closing cylinder 16 via the first limit switch 6 and air pressure is supplied to the lock cylinder 12, so that the pressure relief is performed after the closing operation of the gate valve 4 is completed. The valve 15 is opened, and a time delay that enables the opening / closing of the opening / closing door 8 is formed, so that the air of the hopper 1 is not ejected when the opening / closing door 8 is opened. At the same time, the second limit switch 17 operates to cut the first pneumatic path third branch 25c.

  When the lock cylinder 12 performs the unlocking operation, the divided air pressure in the first air pressure passage third branch 25c on the lock cylinder 12 side is discharged to the atmosphere via the second limit switch 17. However, in this case, a throttle valve or the like can be provided to control the speed of the lock cylinder 12, and the unlocking of the lock mechanism 11 can be delayed with respect to the opening operation of the pressure relief valve 15. it can. This prevents the lock mechanism 11 from being unlocked before the pressure in the hopper 1 drops.

  Thus, when the gate valve 4 is closed and the air pressure inside the hopper 1 is released, the lock mechanism 11 is unlocked and the open / close door 8 can be opened (FIG. 3C )).

  Next, with reference to FIG. 4 (A) to FIG. 4 (C), an operation in the case of shifting the pyrite from the pyrite discharge to the storage state will be described.

  The state where the pyrite is discharged is the same as the state shown in FIG. 3C, the control valve 23 is located at the second position 24b, and the air pressure is the second air pressure path. 26. The valve opening / closing cylinder 16 has the pressure relief valve 15 open, the first limit switch 6 communicates with the second pneumatic path second branch 26b, and the air pressure is the second pneumatic path second branch. It is supplied to the gate cylinder 5 and the lock cylinder 12 through 26b, the gate valve 4 is closed, and the lock mechanism 11 unlocks the door 8 (FIG. 4A).

  Next, when the control valve 23 is operated to reach the first position 24 a, air pressure is supplied to the first air pressure path 25.

  Air pressure is supplied to the lock cylinder 12 via the first air pressure passage first branch 25a, and the open / close door 8 is locked in the closed state. At the same time, air pressure is supplied to the valve opening / closing cylinder 16 via the first air pressure passage second branch 25b, and the pressure relief valve 15 is closed (FIG. 4B).

  When the pressure relief valve 15 is completely closed, the second limit switch 17 is actuated to connect the first pneumatic path third branch 25c. Air pressure is supplied to the gate cylinder 5 through the first pneumatic passage third branch 25c. Accordingly, there is a time delay until the valve opening / closing cylinder 16 operates the second limit switch 17 until the pneumatic pressure for opening the gate valve 4 is supplied to the gate cylinder 5. To do. That is, the gate valve 4 starts to open only when the lock mechanism 11 is completely locked and the pressure relief valve 15 is completely closed.

  By operating the second limit switch 17 and communicating the first pneumatic path third branch 25c, air pressure is supplied to the gate cylinder 5 through the first pneumatic path third branch 25c, The gate cylinder 5 opens the gate valve 4 (FIG. 4C). Accordingly, the pyrite cutout 7 is airtightly closed, the pressure relief valve 15 is closed, the hopper 1 is in a sealed state, and the pyrite 2 is stored through the opened gate valve 4.

  As described above, the first limit switch 6 and the second limit switch 17 are locked when the pyrite 2 is stored in the hopper 1 and / or when the pressure inside the hopper 1 is high. The mechanism 11 maintains the locked state of the opening / closing door 8 and prevents the opening / closing door 8 from being opened, and constitutes a safety holding means.

  The first limit switch 6 and the second limit switch 17 function as delay means for generating an operation delay between the gate cylinder 5 and the lock cylinder 12.

  The first limit switch 6 and the second limit switch 17 mechanically switch the pneumatic circuit using the movement of the cylinder. The first limit switch 6 and the second limit switch No electric signal or electric power is required for the operation of 17, and the opening / closing of the gate valve 4 and the pressure relief valve 15 can be detected without an electrical sensor. As a result, in this embodiment, the operation of the gate valve 4, the lock / release operation by the lock mechanism 11, the detection of opening / closing of the gate valve 4, and the detection of opening / closing of the pressure relief valve 15 are all performed by a pneumatic circuit. It can be done, is simple in construction, and can be achieved at low cost.

  In the above embodiment, the pneumatic circuit is described as the drive circuit. However, it goes without saying that the hydraulic circuit can be similarly implemented.

DESCRIPTION OF SYMBOLS 1 Hopper 2 Pyrite 3 Pyrite discharge duct 4 Gate valve 5 Gate cylinder 6 1st limit switch 7 Pyrite cutout 8 Opening door 9 Opening / closing handle 11 Lock mechanism 12 Lock cylinder 13 Pressure detector 14 Storage level detector 15 Pressure relief valve 16 Valve Opening and closing cylinder 17 Second limit switch 20 Drive circuit 21 Pyrite unloading carriage 22 Traveling cylinder 23 Control valve

Claims (6)

  A hopper for storing pyrite, a pyrite discharge duct communicating with the upper end of the hopper, a pyrite cutout opening provided at a lower portion of the hopper and opened and closed by an open / close door, and a gate cylinder provided in the pyrite discharge duct and opened and closed by a gate cylinder A gate valve, a lock mechanism that is driven by a lock cylinder to lock / unlock the open / close door, and a drive circuit that supplies / discharges operating pressure to / from the gate cylinder and the lock cylinder, respectively. A pyrite discharge device configured to lock / release the lock mechanism by the lock cylinder in response to opening / closing of the gate valve by the gate cylinder.   A pressure relief valve for releasing the internal pressure in the hopper, a valve opening / closing cylinder for opening / closing the pressure relief valve, a first limit switch operated at a stroke end of a gate valve closing operation of the gate cylinder, A second limit switch that operates in response to the opening and closing operation of the pressure relief valve, a driving pressure for unlocking the lock cylinder is supplied via the first limit switch, and the unlocking of the opening and closing door is performed by a gate. The drive pressure is delayed with respect to the valve closing operation, and the driving pressure for opening the gate valve is supplied through the second limit switch. The gate valve opening operation is performed by the pressure relief valve closing operation. The pyrite discharging apparatus according to claim 1, which is performed with a delay.   The driving pressure for opening the gate valve is branched, and the branched driving pressure is supplied as the driving pressure for closing the pressure relief valve and locking the lock cylinder. The pyrite discharging apparatus according to claim 2, wherein the pyrite discharging apparatus is performed with a delay from the locking operation of the locking mechanism.   The pyrite discharge device according to claim 3, wherein the first limit switch and the second limit switch are mechanical switches whose flow paths are switched by a cylinder operation.   The drive circuit has a delay means, the delay means delays the unlocking operation of the lock cylinder with respect to the gate valve closing operation of the gate cylinder, and the gate of the gate cylinder with respect to the lock operation of the lock cylinder. The pyrite discharging apparatus according to claim 1, wherein the pyrite discharging apparatus is configured to delay the valve opening operation.   A pyrite unloading carriage provided so as to be able to travel under the pyrite cutout opening; and a traveling cylinder for traveling the pyrite unloading carriage; the traveling cylinder is configured to have a pyrite receiving position and a pyrite unloading position by the drive circuit. The pyrite discharging apparatus according to claim 1, which is driven so as to reciprocate between them.

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