Dust explosion-proof monitoring and pre-control device of cigarette dust removal pneumatic conveying system

Abstract

The utility model discloses a dust explosion-proof monitoring pre-control device of a cigarette dust-removing pneumatic conveying system, and relates to the technical field of dust explosion prevention of cigarette production equipment. Explosion-proof detection mechanisms such as a temperature sensor, a pressure sensor and an electrostatic spark detector, and control execution mechanisms such as an extinguishing and cooling device, a pressure relief control valve and a pipeline blocking valve device are arranged on the dust removal branch pipe and the main pipe, and are connected with a centralized control device; real-time monitoring and pre-control of temperature, pressure and electrostatic sparks of the cigarette dust in the conveying process are achieved. When abnormal conditions are detected, sound and light alarms can be given out in time, measures such as water spraying cooling, pressure relief and pipeline blocking are taken, dust explosion is effectively prevented and controlled, and the safety of cigarette production equipment and personnel is protected. Meanwhile, by arranging the one-way explosion-proof device, it is ensured that when the dust removal equipment explodes, impact airflow cannot affect an upstream conveying pipeline and equipment, and the safety of the system is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of dust explosion prevention in cigarette production equipment, in particular to a dust explosion prevention monitoring and pre-control device for a cigarette dust removal air conveying system. Background Art

[0002] At present, most of the dust explosion prevention measures for cigarette dust in cigarette production focus on the dust collector body, and there is little research on the monitoring and control of dust explosion prevention in the pipeline conveying system. However, since the tobacco dust conveying system is a closed pipeline pneumatic conveying system with generally long conveying pipelines and many parallel branches, and the tobacco dust has flammable characteristics. During the long-distance pneumatic conveying of tobacco dust in the pipeline, factors such as the friction between the tobacco dust and the pipeline, fragmentation, blockage in dust conveying, and low-load operation will cause the temperature, concentration, pipeline pressure of the dust in the pipeline to increase, as well as frictional static electricity sparks. When the concentration, temperature, pressure, and static electricity sparks of the tobacco dust in the conveying pipeline reach a certain level, it is bound to cause the spontaneous combustion and even explosion of the tobacco dust. Therefore, it is urgent to develop a device that can monitor and pre-control the cigarette explosion prevention and dust removal conveying system. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a dust explosion prevention monitoring and pre-control device for a cigarette dust removal air conveying system to monitor and pre-control abnormal conditions during the conveying of tobacco dust and reduce the harm to subsequent dust removal equipment and pipeline systems.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: A dust explosion prevention monitoring and pre-control device for a cigarette dust removal air conveying system includes an explosion prevention detection mechanism and a control execution mechanism that are successively installed on the pipeline along the air flow conveying direction. The explosion prevention detection mechanism includes a temperature sensor, a pressure sensor, and an electrostatic spark detector for detecting the inside of the pipeline. The control execution mechanism includes an extinguishing and cooling device, a pressure relief control valve, and a pipeline blocking valve device. Both the explosion prevention detection mechanism and the control execution mechanism are connected to a centralized control device.

[0005] Preferably, an explosion prevention detection mechanism and a control execution mechanism are provided on each conveying branch pipeline of the cigarette explosion prevention and dust removal conveying system and on the aggregated conveying main pipeline. A one-way explosion isolation device that only allows air flow to be conveyed in the direction of the dust removal equipment is also provided between the end of the conveying main pipeline and the external dust removal equipment.

[0006] More preferably, the extinguishing and cooling device includes a water pipe connected to external water supply, a solenoid valve, a flow switch, and a spray head provided on the water pipe. The spray head is installed on the top of the pipeline and is used to spray water into the pipeline.

[0007] More preferably, the number of the spray heads is multiple and they are arranged at intervals along the air flow conveying direction.

[0008] More preferably, the pipeline valve blocking device includes a valve arranged in the pipeline and a driving mechanism for driving the valve to open or close.

[0009] More preferably, the centralized control device includes an audible and visual alarm device, an integrated module and an integrated control box, and a touch display screen.

[0010] Compared with the prior art, the utility model is provided with a variety of explosion-proof detection instruments and execution control devices such as temperature detection, pressure detection and static spark detection on the cigarette explosion-proof dust removal air conveying pipeline, which can monitor and pre-control the conveying state of tobacco dust in the pipeline, so as to facilitate different forms of intervention and control according to different states and harm degrees of the dust in the conveying pipeline, reduce the damage to the front and rear equipment during the cigarette dust conveying, prevent the explosion of the dust in the pipeline, improve the cigarette production efficiency and extend the service life of the cigarette equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a front view schematic diagram of the overall structure of the utility model;

[0012] Figure 2 is a top view schematic diagram of the overall structure of the utility model;

[0013] Figure 3 is a monitoring and pre-control schematic diagram of a branch pipe of the cigarette explosion-proof dust removal conveying system in the embodiment;

[0014] Figure 4 is a monitoring and pre-control schematic diagram of a main pipe of the cigarette explosion-proof dust removal conveying system in the embodiment.

[0015] In the figure:

[0016] 1 - temperature sensor; 2 - pressure sensor; 3 - static spark detector

[0017] 4 - extinguishing and cooling device; 41 - solenoid valve; 42 - flow switch

[0018] 43 - nozzle; 44 - water pipe; 5 - pressure relief control valve

[0019] 6 - pipeline blocking valve device; 7 - centralized control device

[0020] 71 - audible and visual alarm device; 72 - integrated control box; 73 - touch display screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the embodiments does not limit the present utility model.

[0022] It should be noted in advance that in the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0023] As Figures 1 to 4 shown, the dust explosion-proof monitoring and pre-control device for the cigarette dust removal air delivery system includes an explosion-proof detection mechanism and a control execution mechanism that are successively installed on the pipeline along the air flow transportation direction. The explosion-proof detection mechanism includes a temperature sensor 1, a pressure sensor 2, and an electrostatic spark detector 3 for detecting the interior of the pipeline. The control execution mechanism includes an extinguishing and cooling device 4, a pressure relief control valve 5, and a pipeline blocking valve device 6. Both the explosion-proof detection mechanism and the control execution mechanism are connected to a centralized control device 7. An explosion-proof detection mechanism and a control execution mechanism are provided on each conveying branch pipeline and the aggregated and connected main conveying pipeline of the cigarette dust removal pipeline system. A one-way explosion isolation device 8 that only allows air flow to be conveyed towards the dust removal device is also provided between the end of the main conveying pipeline and the external dust removal device.

[0024] In the above structure, the extinguishing and cooling device 4 includes a water pipe 44 connected to external water supply, a solenoid valve 41, a flow switch 42, and a spray head 43 provided on the water pipe 44. The spray head 43 is installed on the top of the pipeline and is used for spraying water into the pipeline interior. Among them, the number of spray heads 43 is multiple and they are arranged at intervals along the air flow transportation direction.

[0025] The pipeline valve blocking device 6 in this embodiment includes a valve provided in the pipeline and a driving mechanism for driving the valve to open or close. For example, the valve is a valve plate structure, and the driving mechanism is automatic. By driving the valve plate to rotate with a motor or compressed air, etc., the interior of the pipeline can be opened or blocked.

[0026] In addition, the temperature detection, pressure detection, and static spark detection in this embodiment can classify the detection data according to actual operating needs. The grade specifications can be divided into three forms: normal transportation, transportation alarm, and supercritical operation. The centralized control device 7 includes an audible and visual alarm device 71, an integrated module, and an integrated control box 72, and a touch display screen 73. The audible and visual alarm device 71, the integrated control module, and the touch display screen 73 are integrated on the control box 72. The control box 72 is located on the side of the conveying pipeline for easy observation and operation, and is used to control and respond to abnormal monitoring situations. The centralized control device 7 can also set different control modes such as normal transportation, transportation alarm, and supercritical operation according to the classification of the monitoring data in the monitoring instrument and actual operating needs.

[0027] The temperature sensor 1, pressure sensor 2, static spark detector 3, solenoid valve 41, flow switch 42, pressure relief control valve 5, pipeline blocking valve device 6, one-way explosion-proof device 8, and the centralized control device 7 such as the audible and visual alarm device 71, touch display screen 73, and integrated control box 72 in this embodiment are all intrinsically safe explosion-proof products.

[0028] It should be noted that the one-way explosion-proof device 8 in this embodiment is arranged on the conveying inlet pipe of the main pipe close to the dust collector equipment. When an explosion occurs in the dust collector equipment, the impact air flow generated is not affected by the upstream conveying pipeline and equipment, thereby protecting the cigarette equipment. The specific implementation principle can refer to the existing one-way explosion-proof valve structure, such as the air inlet pipe one-way explosion-proof valve in CN 208831815 U. Through the setting of the valve core plate and the balance weight structure, it can achieve the effect of quickly retracting the valve core plate to block the air inlet to prevent the high-temperature and high-pressure shock wave generated by the explosion from entering the air inlet pipe.

[0029] The working principle of the dust explosion-proof monitoring and pre-control device for the cigarette dust removal and pneumatic conveying system provided by the above embodiment is as follows: When the tobacco dust conveyed by the branch pipe or main pipe of the centralized dust removal and conveying system is within the normal range, the data detected by the temperature sensor 1, pressure sensor 2, and static spark detector 3 are all within the normal range, and the tobacco dust is normally conveyed.

[0030] When the temperature value of the conveyed tobacco dust reaches the alarm setting value, the temperature sensor 1 transmits the detection signal to the centralized control device 7, controls the audible and visual alarm device 71 to emit an audible and visual alarm, and at the same time makes the extinguishing and cooling device 4 spray water mist for cooling. When the temperature detection 1 value reaches the supercritical set temperature, the centralized control device 7 not only controls the audible and visual alarm and increases the amount of water mist sprayed, but also controls the pipeline blocking valve device 6 behind the conveying to close and notifies the dust removal valve of the cigarette machine to close, so as to control the high temperature of the dust within a local range and not affect the front cigarette equipment and the rear dust removal equipment.

[0031] When the pressure detection value of the conveyed tobacco dust reaches the alarm setting value, the pressure sensor 2 transmits the detection signal to the centralized control device 7, and controls the sound and light alarm device 71 to give out a sound and light alarm. At the same time, the pressure relief control valve 5 relieves pressure to reduce the internal pressure of the pipeline; when the pressure detection value reaches the supercritical setting pressure, in addition to controlling the sound and light alarm 71 and strengthening the pressure relief amount of the pressure relief control valve 5, the centralized control device 7 also controls the pipeline blocking valve device 6 behind the conveying to close and notifies the dust removal valve of the cigarette machine to close, so as to control the high-pressure dust area within a local range without affecting the front cigarette equipment and the rear dust removal equipment.

[0032] When the degree of static electric spark detected by the static electric spark detector 3 of the conveyed tobacco dust reaches the alarm setting value, the detection signal is transmitted to the centralized control device 7, and controls the sound and light alarm device 71 to give out a sound and light alarm. At the same time, it controls the extinguishing and cooling device 4 to spray water mist for fire extinguishing and cooling; when it is detected that the spark significantly exceeds the critical setting, in addition to controlling the sound and light alarm 71 and strengthening the water mist amount of the water spray, the centralized control device 7 also controls the pipeline blocking valve device 6 behind the conveying to close and notifies the dust removal valve of the cigarette machine to close, so as to control the dust spark area within a local range without affecting the front cigarette equipment and the rear dust removal equipment.

[0033] When dust removal equipment such as dust collectors at the end of the conveyed tobacco dust explodes due to high temperature, high pressure or sparks, due to the reverse flow of air, the one-way explosion isolation device 8 at the end of the explosion-proof dust removal pipeline system is automatically closed under pressure, preventing the high-pressure and high-temperature air flow generated by the explosion of the dust removal equipment from affecting the front conveying pipeline and cigarette equipment.

[0034] The dust explosion monitoring and pre-control device of the cigarette dust removal air conveying system of the present utility model realizes the real-time monitoring and pre-control of the temperature, pressure and static electric sparks of cigarette dust during the conveying process by installing explosion-proof detection mechanisms such as temperature sensors, pressure sensors and static electric spark detectors on the pipeline, as well as control and execution mechanisms such as extinguishing and cooling devices, pressure relief control valves and pipeline blocking valve devices, and connecting them to the centralized control device. When abnormal conditions are detected, it can give out a sound and light alarm in time, and take measures such as spraying water for cooling, relieving pressure and blocking the pipeline to effectively prevent and control dust explosions and protect the safety of cigarette production equipment and personnel. At the same time, by setting the one-way explosion isolation device, it is ensured that when the dust removal equipment explodes, the impact air flow will not affect the upstream conveying pipeline and equipment, further enhancing the safety of the system.

[0035] In order to make it more convenient for those of ordinary skill in the art to understand the improvements of the present utility model over the prior art, some drawings and descriptions of the present utility model have been simplified, and the above embodiments are the preferred implementation schemes of the present utility model. In addition, the present utility model can also be implemented in other ways. Any obvious replacement within the premise of not departing from the concept of the technical solution is within the protection scope of the present utility model.

Claims

1. The dust explosion-proof monitoring and pre-control device of the cigarette dust removal and air conveying system is characterized by: The invention comprises an explosion-proof detection mechanism and a control actuator which are successively installed on a pipeline along the air flow conveying direction. The explosion-proof detection mechanism comprises a temperature sensor (1), a pressure sensor (2) and an electrostatic spark detector (3) for detecting the inside of the pipeline. The control actuator comprises an extinguishing and cooling device (4), a pressure relief control valve (5) and a pipeline blocking valve device (6). The explosion-proof detection mechanism and the control actuator are both connected to a centralized control device (7).

2. The dust explosion prevention monitoring and pre-control device for the cigarette dust removal and air conveying system according to claim 1 is characterized in that: Each branch conveying pipeline of the cigarette explosion-proof dust removal conveying system and the main conveying pipeline for collective connection are provided with an explosion-proof detection mechanism and a control actuator. A one-way explosion-proof device (8) is also provided between the end of the main conveying pipeline and the external dust removal equipment for conveying air only in the direction of the dust removal equipment.

3. The dust explosion prevention monitoring and pre-control device for the cigarette dust removal and air conveying system according to claim 1 is characterized in that: The extinguishing and cooling device (4) comprises a water pipe (44) connected to an external water supply, a solenoid valve (41) arranged on the water pipe (44), a flow switch (42) and a spray head (43); the spray head (43) is installed on the top of the pipe and is used to spray water toward the inside of the pipe.

4. The dust explosion prevention monitoring and pre-control device for the cigarette dust removal and air conveying system according to claim 3 is characterized by: The number of the nozzles (43) is plural and they are arranged at intervals along the airflow conveying direction.

5. The dust explosion prevention monitoring and pre-control device for the cigarette dust removal and air conveying system according to claim 1 is characterized in that: The pipeline blocking valve device (6) comprises a valve arranged in the pipeline and a driving mechanism for driving the valve to open or close.

6. The dust explosion prevention monitoring and pre-control device for the cigarette dust removal and air conveying system according to claim 1 is characterized in that: The centralized control device (7) comprises an audible and visual alarm device (71), an integrated module and integrated control box (72), and a touch display screen (73).

7. A cigarette dust removal air conveying system, characterized in that: A dust explosion prevention monitoring and pre-control device for a cigarette dust removal and air conveying system as claimed in any one of claims 1 to 6 is provided.

Images