CN217606105U

CN217606105U - Photoelectric switch type slag blockage measuring device

Info

Publication number: CN217606105U
Application number: CN202221790865.9U
Authority: CN
Inventors: 王敷勇
Original assignee: Huaneng Fujian Energy Development Co Ltd Fuzhou Branch
Current assignee: Huaneng Fujian Energy Development Co Ltd Fuzhou Branch
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-10-18
Anticipated expiration: 2032-07-12

Abstract

The utility model discloses a photoelectric switch type slag blockage measuring device in the technical field of thermotechnical measuring devices, which comprises a slag conveyor chain for scraping ash slag to a slag hopper of a slag crusher; a light-transmitting protection component is arranged outside each of the transmitting photoelectric unit and the receiving photoelectric unit; the control unit outputs a signal when the continuous time of the receiving photoelectric unit is longer than a preset threshold value and the optical signal of the transmitting photoelectric unit is not received; the execution unit is used for receiving signals and executing cleaning action or alarming action on the light-transmitting protection component; the utility model detects whether the slag hopper of the slag crusher is blocked or not in an optical mode consisting of the transmitting photoelectric unit and the receiving photoelectric unit, thereby avoiding the defects on most mechanical structures; and when the transmitting photoelectric unit and the receiving photoelectric unit are polluted by dust in the air and ash in a slag hopper of a slag crusher at the bottom of the furnace, a washing instruction is sent to wash the optical channel and the glass lens for 2 seconds.

Description

Photoelectric switch type slag blockage measuring device

Technical Field

The utility model relates to a thermotechnical measuring device technical field specifically is a stifled sediment measuring device of photoelectric switch formula.

Background

Slag hopper working condition of furnace bottom slag crusher of coal-fired thermal power plant: after coal is combusted in a boiler, ash falls into a slag conveyor at the bottom of the boiler, an ash slag is scraped to a slag hopper of a slag crusher by a chain of the slag conveyor, the ash slag is in a solid state at the moment, and the size of the ash slag is variable. A water seal is arranged on the slag conveyor at the bottom of the furnace, a water spraying device is also arranged on a slag hopper of the slag crusher, and the slag is in a solid state and also carries much moisture.

What adopt for the jam of monitoring slag crusher sediment fill among the prior art is: the slag hopper is provided with a rotation-resisting material level switch. The working principle of the rotation-resistant material level switch is as follows: an alternating current micro motor is adopted to drive the monitoring blade to rotate at a low speed after speed reduction, and when the material level of the material rises to block the rotation of the blade, the detection mechanism generates rotary displacement around the main shaft. This displacement first causes a microswitch to be actuated, signaling a blockage. Then another microswitch is acted to cut off the power supply of the micromotor to stop rotating. The state is kept as long as the material level in the slag hopper blocks the rotation of the monitoring blade. When the material level is lowered and the detection blade is not blocked any more, the detection mechanism is restored to the original state by the spring tension. First, a micro switch is operated to turn on the power supply to rotate the switch. Then the other microswitch sends out a material-free signal, and the state is kept as long as no material blocks the rotation of the monitoring blade.

The application of the rotation-resistant material level switch on the slag hopper of the slag crusher has three problems:

1. the rotation-resisting material level switch is applied to a slag hopper of the slag crusher, and falling slag easily crushes blades.

2. The falling slag is accumulated above the rotation-resistant material level switch and is collided with the blade to be mistakenly moved.

3. The rotation-resisting material level switch bearing is corroded and stuck.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stifled sediment measuring device of photoelectric switch formula to the formula material level switch monitoring slag crusher sediment fill that hinders who provides in solving above-mentioned background art blocks up the problem that has the defect.

In order to achieve the above object, the utility model provides a following technical scheme: a photoelectric switch type slag blockage measuring device comprises:

scraping ash slag to a slag conveyor chain of a slag hopper of a slag crusher;

a photoelectric detection unit: the device comprises an emitting photoelectric unit and a receiving photoelectric unit, wherein the receiving photoelectric unit is used for receiving optical signals after the optical signals pass through a slag hopper of a slag crusher, and light-transmitting protection components are arranged outside the emitting photoelectric unit and the receiving photoelectric unit;

a control unit: the control unit is in communication connection with the receiving photoelectric unit and is used for outputting a first signal when the continuous time of the receiving photoelectric unit is longer than a preset first threshold value and the optical signal sent by the transmitting photoelectric unit is not received; meanwhile, the control unit outputs a second signal when the continuous time of the receiving photoelectric unit is longer than a preset second threshold value and the optical signal of the transmitting photoelectric unit is not received, wherein the first threshold value is smaller than the second threshold value;

an execution unit: the execution unit is used for receiving the first signal and then executing a cleaning action on the light-transmitting protection component; and the execution unit is used for executing the alarm action after receiving the second signal.

Preferably, the light transmission protection assembly comprises a fixed base assembly and a movable base assembly which are detachably connected, the transmitting photoelectric unit and the receiving photoelectric unit are arranged in the corresponding movable base assemblies, a glass lens is arranged between the fixed base assembly and the movable base assembly, and the glass lens isolates the corresponding transmitting photoelectric unit or receiving photoelectric unit from the outside.

Preferably, the fixed base assembly is provided with an optical channel for transmitting optical signals of the corresponding transmitting photoelectric unit or receiving photoelectric unit.

Preferably, a sealing ring is arranged between the glass lens and the optical channel of the fixed base assembly.

Preferably, a flushing water joint communicated with the optical channel is arranged on the fixed base assembly; the execution unit comprises a washing water electromagnetic valve connected with the washing water joint, and the washing water electromagnetic valve is connected with an external water source.

Preferably, the execution unit further comprises a DCS system, and the DCS system is connected to an external protection device.

Preferably, the fixed base assembly is welded on the side wall of the slag hopper of the slag crusher.

Preferably, the control unit adopts a PLC.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model detects whether the slag hopper of the slag crusher is blocked or not in an optical mode consisting of the transmitting photoelectric unit and the receiving photoelectric unit, thereby avoiding the defects on most mechanical structures; and when the transmitting photoelectric unit and the receiving photoelectric unit are polluted by dust in the air and ash in a slag hopper of the slag crusher at the bottom of the furnace, a flushing instruction is sent to flush the optical channel and the glass lens for 2 seconds.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an exploded view of the light transmission protection assembly of the present invention;

FIG. 3 is a schematic diagram of a control circuit of the present invention;

fig. 4 is a logic diagram of the PLC of the present invention.

1. An instrument cabinet; 2. a light transmissive protective component; 4. a first cable signal line; 5. a flushing water solenoid valve; 6. an emitting photoelectric unit; 9. a receiving photoelectric unit; 12. flushing a water pipe; 14. a slag hopper of the slag crusher; 16. a second cable signal line; 17. a third cable signal line; 18. a dragveyer chain; 21. fixing the base assembly; 22. a movable base assembly; 23. a glass lens; 24. an optical channel; 25. a rinse water connection; 26. and (5) sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The utility model discloses an embodiment:

the transmitting photoelectric unit 6 and the receiving photoelectric unit 9 form a correlation photoelectric switch, such as model: and the receiving photoelectric unit 9 receives signals of the photoelectric switch and is connected to a control unit (such as a PLC) in real time in a correlation type SC 10M-1K-RS.

The fixed base assembly 21 is welded on the side wall of the slag hopper 14 of the slag crusher, the transmitting photoelectric unit 6 and the receiving photoelectric unit 9 are installed on the corresponding movable base assembly 22, a penetrating optical channel 24 is formed between the two opposite side walls of the fixed base assembly 21, the glass lens 23 is positioned between the fixed base assembly 21 and the movable base assembly 22, the glass lens 23 is clamped and fixed when the rotating movable base assembly 22 and the fixed base assembly 21 are connected into a whole through threads, a sealing ring 26 is arranged between the glass lens 23 and the fixed base assembly 21, and the sealing ring 26 prevents water from passing through the glass lens 23 and contacting the transmitting photoelectric unit 6 or the receiving photoelectric unit 9; the infrared light emitted by the emitting photoelectric unit 6 is sent out through the corresponding glass lens 23 and the optical channel 24 in sequence; the infrared light received by the receiving photoelectric unit 9 is received inwards through the corresponding optical channel 24 and the glass lens 23 in sequence.

The flushing water solenoid valve 5 is connected to two sets of flushing water connections 25 via a flushing water pipe 12. The flushing water electromagnetic valve 5 is electrically connected with the PLC through a first cable signal line 4, and the transmitting photoelectric unit 6 and the receiving photoelectric unit 9 are respectively electrically connected with the PLC through a corresponding third cable signal line 17 and a corresponding second cable signal line 16. The power switch, the PLC, the relay and other components are installed in the instrument cabinet.

The slag conveyor chain 18 conveys the ash into the slag hopper 14 of the slag crusher, the transmitting photoelectric unit 6 and the receiving photoelectric unit 9 are oppositely arranged on the side walls at two opposite sides of the slag hopper 14 of the slag crusher, and infrared light emitted by the transmitting photoelectric unit 6 passes through the inner cavity of the slag hopper 14 of the slag crusher and then is received by the opposite receiving photoelectric unit 9 to form a loop; the time for the ash to rapidly pass through the space between the transmitting photoelectric unit 6 and the receiving photoelectric unit 9 under the action of the self gravity is far less than the first threshold (6 seconds), so that the judgment on whether the glass lens 23 is clean or not is not influenced.

When the glass lenses 23 corresponding to the transmitting photoelectric unit 6 and/or the receiving photoelectric unit 9 are polluted by dust in the air and ash in a slag hopper of a slag crusher at the bottom of the furnace, infrared light emitted by the transmitting photoelectric unit 6 is blocked by the dirty objects when passing through the glass lenses 23, so that the receiving photoelectric unit 9 cannot receive the infrared light; or the optical channel 24 is blocked on the transmission path of the infrared light by the slag bucket;

after the PLC judges that the continuous blocking time of the infrared light exceeds a first threshold value (6 seconds), a digital quantity output point DO10.05 of the PLC acts, a relay K1 acts to control the flushing water electromagnetic valve 5 to be electrified and opened for 2 seconds, and external water sequentially passes through the flushing water electromagnetic valve 5, the flushing water pipe 12 and the flushing water joint 25 to flush the glass lenses 23 and the optical channel 24 for 2 seconds. The flushing water is discharged from the optical channel 24 outwards.

When the PLC judges that the continuous infrared light blocking time exceeds a second threshold value (16 seconds), the PLC automatically judges that slag is blocked in a slag hopper 14 of the slag crusher, the PLC controls a red light of a field instrument panel to be on to realize alarming, and a contact signal is sent to a DCS system to trigger a corresponding protection device and alarm; the protection device protects the external equipment for the external equipment, and avoids the slag blockage of the slag hopper 14 of the slag crusher to cause the damage of the external related equipment.

And the timer in the PLC is used for timing when the receiving photoelectric unit 9 does not receive the signal of the transmitting photoelectric unit 6, comparing the timing with a preset first threshold value and a preset second threshold value, and triggering the corresponding flushing water electromagnetic valve 5 or the DCS according to the comparison structure.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a stifled sediment measuring device of photoelectric switch formula which characterized in that: the method comprises the following steps:

a slag conveyor chain (18) for scraping the ash slag to a slag hopper (14) of the slag crusher;

a photoelectric detection unit: the device comprises an emitting photoelectric unit (6) and a receiving photoelectric unit (9), wherein the receiving photoelectric unit (9) is used for receiving optical signals after the optical signals pass through a slag hopper (14) of a slag crusher, and light-transmitting protection components (2) are arranged outside the emitting photoelectric unit (6) and the receiving photoelectric unit (9);

a control unit: the control unit is in communication connection with the receiving photoelectric unit (9), and is used for outputting a first signal when the continuous time of the receiving photoelectric unit (9) is longer than a preset first threshold value and does not receive the optical signal sent by the transmitting photoelectric unit (6); meanwhile, the control unit outputs a second signal when the continuous time of the receiving photoelectric unit (9) is greater than a preset second threshold value and the optical signal of the transmitting photoelectric unit (6) is not received, wherein the first threshold value is smaller than the second threshold value;

2. The photoelectric switch type clogging measuring device according to claim 1, characterized in that: the light transmission protection assembly comprises a fixed base assembly (21) and a movable base assembly (22) which are detachably connected, the transmitting photoelectric unit (6) and the receiving photoelectric unit (9) are arranged in the corresponding movable base assemblies (22), a glass lens (23) is arranged between the fixed base assembly (21) and the movable base assembly (22), and the corresponding transmitting photoelectric unit (6) or the corresponding receiving photoelectric unit (9) is isolated from the outside by the glass lens (23).

3. The photoelectric switch type clogging measuring device according to claim 2, characterized in that: and the fixed base assembly (21) is provided with an optical channel (24) for transmitting optical signals of the corresponding transmitting photoelectric unit (6) or receiving photoelectric unit (9).

4. The photoelectric switch type clogging measuring device according to claim 3, characterized in that: and a sealing ring (26) is arranged between the glass lens (23) and the optical channel (24) of the fixed base assembly (21).

5. The photoelectric switch type clogging measuring device according to claim 3, characterized in that: a flushing water joint (25) communicated with an optical channel (24) is arranged on the fixed base assembly (21); the execution unit comprises a washing water solenoid valve (5) connected with the washing water joint (25), and the washing water solenoid valve (5) is connected with an external water source.

6. The photoelectric switch type clogging measuring device according to claim 5, wherein: the execution unit further comprises a DCS system, and the DCS system is connected with an external protection device.

7. The photoelectric switch type clogging measuring device according to claim 2, characterized in that: the fixed base assembly (21) is welded on the side wall of the slag hopper (14) of the slag crusher.

8. The photoelectric switch type clogging measuring device according to claim 1, characterized in that: the control unit adopts a PLC.