An explosion-proof fan for stone processing plants

Abstract

The utility model discloses a kind of anti-explosion fan for stone processing factory.Belongs to stone processing technical field, for the dust removal passive of existing anti-explosion fan, monitoring response lag and limited anti-explosion effect problem, the following technical scheme is proposed: fan main body includes shell, PLC controller and base, impeller and bearing are equipped in shell, shell side is equipped with air inlet, one end is equipped with air outlet, and both form gas flow channel in communication;First nozzle group is installed in the inner side wall of air inlet, second nozzle group is installed in the rear area of impeller, shell top end is equipped with blowing device, first, second nozzle group is connected with gas compression component through nozzle pipeline, and dust in channel is actively washed by high-pressure compressed gas, to prevent accumulation.

Description

Technical Field

[0001] This utility model relates to the field of stone processing technology, and in particular to an explosion-proof fan for stone processing plants. Background Technology

[0002] Stone processing (such as cutting, grinding, and polishing) generates a large amount of dust. This dust has a small particle size and is easily suspended. When its concentration reaches the explosion limit (usually 30-40 g / m³), it can easily cause a dust explosion when exposed to open flames or high-temperature surfaces, posing a serious threat to production safety. Therefore, explosion-proof fans are key ventilation equipment in stone processing plants, and their performance directly affects the dust control effect.

[0003] In existing technologies, dust tends to accumulate in explosion-proof fans, such as behind the impeller. Due to the rotation of the impeller, a large amount of dust can easily accumulate behind it and is difficult to clean. There is a lack of active intervention methods, and it is impossible to directly remove the dust that has adhered to the fan channel, resulting in limited explosion-proof effect.

[0004] Therefore, an explosion-proof fan for stone processing plants was proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing an explosion-proof fan for stone processing plants.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: an explosion-proof fan for a stone processing plant, comprising a fan body, the fan body being composed of a housing, a PLC controller, and a base, wherein an impeller and bearing are disposed inside the housing, and a drive motor is installed at the outer end of the housing, the drive motor being connected to the bearing for transmission, characterized in that: An air inlet is provided on the side of the housing, and an air outlet is provided at one end of the housing. The air inlet and the air outlet are connected to form a gas flow channel. The impeller is disposed in the gas flow channel to drive the gas flow. A first nozzle group is installed on the inner sidewall of the air inlet, a second nozzle group is installed in the area behind the impeller, and a blowing device is installed on the top of the housing. The blowing device includes a gas compression assembly and a nozzle pipe connected to the gas compression assembly. The first nozzle group and the second nozzle group are respectively connected to the gas compression assembly through the nozzle pipe. The blowing device blows compressed gas into the gas flow channel through the first nozzle group and the second nozzle group to remove dust or flammable gas accumulated in the channel, thereby achieving explosion-proof function.

[0007] As a preferred embodiment of this utility model, the gas compression assembly is equipped with a pressure switch, which is electrically connected to the PLC controller. The pressure switch is used to monitor the working pressure of the gas compression assembly in real time and feed the pressure signal back to the PLC controller to adjust the blowing intensity of the blowing device.

[0008] As a preferred technical solution of this utility model, a laser dust sensor is installed on the bottom wall inside the air outlet, and the laser dust sensor is electrically connected to the PLC controller; the laser dust sensor is used to monitor the dust concentration at the air outlet in real time. When the dust concentration is detected to reach a preset danger value, the PLC controller controls the drive motor to start at maximum power to accelerate gas flow, and at the same time triggers the alarm device to issue an audible and visual alarm.

[0009] As a preferred technical solution of this utility model, the PLC controller has a multi-level control strategy preset. When the laser dust sensor detects that the dust concentration exceeds the safety threshold but does not reach the danger value, the PLC controller first starts the blowing device to perform intermittent blowing. If the concentration continues to rise to the danger value, the drive motor is further started to the maximum power and an alarm is triggered.

[0010] As a preferred technical solution of this utility model, a one-way valve is provided at the connection between the nozzle pipe of the blowing device and the first nozzle group and the second nozzle group. The one-way valve is used to prevent dust or gas in the gas flow channel from entering the nozzle pipe in reverse, so as to ensure the one-way blowing function of the blowing device.

[0011] As a preferred technical solution of this utility model, a temperature sensor is provided inside the housing, and the temperature sensor is electrically connected to the PLC controller; when the temperature inside the housing exceeds the preset safety value, the PLC controller controls the drive motor to stop and starts the spraying device for forced cooling.

[0012] The beneficial effects of this utility model are reflected in: This invention significantly improves the safety and reliability of dust-prone environments such as stone processing plants through the synergistic innovation of a jet-blowing device and an intelligent monitoring system. The jet-blowing device, through the combined effect of pre-blowing at the air inlet and directional cleaning on the back of the impeller, actively flushes the gas flow channel with high-pressure compressed gas, effectively preventing dust accumulation in critical areas and reducing the risk of explosion from the source. At the same time, the laser dust sensor monitors the dust concentration at the air outlet in real time, and combined with the multi-level control strategy of the PLC controller, it responds quickly when the dust concentration is abnormal, avoiding excessive intervention that affects production and enabling forced risk reduction in emergency situations, significantly improving the adaptability of the fan to complex working conditions. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a flowchart of the present invention.

[0014] In the picture 1. Fan body; 101. Impeller; 102. Drive motor; 103. Second nozzle group; 2. Air inlet; 201. First nozzle group; 3. Air outlet; 301. Laser dust sensor; 4. PLC controller; 5. Pulse blowing device; 501. Gas compression assembly; 6. Base. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0016] Example 1 Please see Figure 1-3 This utility model discloses an explosion-proof fan for stone processing plants.

[0017] The explosion-proof fan includes a housing, a PLC controller 4, and a base 6. An impeller 101 and bearings are installed inside the housing, and a drive motor 102 is connected to the outer end of the housing via a drive shaft. An air inlet 2 is located on the side of the housing, and an air outlet 3 is located at one end; the two are connected to form a gas flow channel. The impeller 101 is located within this channel and drives the gas flow through its rotation.

[0018] The inner wall of the air inlet 2 is provided with a first nozzle group 201 arranged in a ring. The nozzle direction is at a 30° angle with the air intake direction. It is used to pre-spray compressed gas during the air intake stage to prevent dust from accumulating in the air inlet 2.

[0019] A second nozzle group 103 is provided in the area behind the impeller 101, with the nozzles facing the back of the impeller 101, for removing dust adhering to the impeller 101 when it rotates.

[0020] The inner wall of the air inlet 2 and the area behind the impeller 101 are both places where dust easily accumulates, and the area behind the impeller 101 is a difficult place to clean.

[0021] A jetting device 5 is installed at the top of the housing, and its interior contains a gas compression assembly 501 (including a high-pressure air pump and an air tank) and nozzle pipes. The nozzle pipes are connected to the first nozzle group 201 and the second nozzle group 103 respectively through branch pipes, and solenoid valves are installed in the pipes to control the opening and closing of the jetting.

[0022] When the fan starts, the PLC controller 4 simultaneously activates the gas compression assembly 501. Compressed gas (pressure 0.6-0.8 MPa) in the gas storage tank is delivered to the first nozzle group 201 and the second nozzle group 103 through the nozzle pipeline. The first nozzle group 201 uses pulse-type jet blowing to disperse the dust near the air inlet 2 and allow it to enter the channel with the airflow. The second nozzle group 103 removes the dust adhering to the back of the impeller 101.

[0023] A pressure switch is installed in the gas compression assembly 501 to monitor the pressure of the gas storage tank in real time. When the pressure is lower than 0.5MPa, the PLC controller 4 reduces the blowing frequency; after the pressure recovers to 0.8MPa, the set blowing intensity is restored to ensure a balance between energy consumption and cleaning efficiency.

[0024] Example 2 This embodiment adds a laser dust sensor 301 and its linkage function with the PLC controller 4 to the existing embodiment 1, enabling proactive response when dust concentration exceeds limits. Please refer to [link to embodiment 1]. Figure 1-4 : A laser dust sensor 301 is installed on the bottom wall inside the air outlet 3. The sensor's transmitter and receiver are arranged diagonally to ensure that the detection area covers the entire cross-section of the air outlet 3. The laser dust sensor 301 detects dust concentration in real time using the Mie scattering principle, and the data is transmitted to the PLC controller 4 as a 4-20mA current signal. The PLC has two preset threshold levels: Safety threshold: Dust concentration ≤ 10 mg / m³ under normal operating conditions; Hazard threshold: Dust concentration > 15 mg / m³ requires emergency handling.

[0025] When the concentration is >10mg / m³ but ≤15mg / m³: PLC controller 4 prioritizes starting the intermittent blowing mode of the blowing device 5, and the blowing frequency of the first nozzle group 201 and the second nozzle group 103 is increased to 20 times / minute. If the concentration does not decrease after 5 minutes, it will enter the next level of response. When the concentration is >15mg / m³: PLC controller 4 controls the drive motor 102 to increase the power to 120% of the rated power and adjusts the speed through the frequency converter to accelerate the gas flow to dilute the dust concentration; triggers the alarm device audible and visual alarm, and the alarm signal continues until the concentration drops below 10mg / m³; at the same time, the blowing device 5 switches to continuous blowing mode, and the first nozzle group 201 and the second nozzle group 103 continue to work until the concentration reaches the standard.

[0026] If the concentration does not decrease after the blowing device 5 has been operating continuously for 10 minutes, the PLC controller 4 will automatically stop the machine and lock the drive motor 102 to prevent the dust concentration from further increasing and causing risks. The PLC controller 4 records the time, peak concentration, and handling measures for each dust exceedance event, and uploads the data to the cloud management platform via a 4G module for subsequent analysis and optimization.

[0027] Example 3 This embodiment adds a temperature sensor to the existing embodiment 2 to achieve linkage protection under high-temperature conditions.

[0028] A temperature sensor is installed on the inner wall of the housing (near the impeller area), with a detection range of -20℃ to 200℃ and an accuracy of ±1℃. The sensor data is transmitted to the PLC controller in real time.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Additionally, "multiple" refers to two or more.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof fan for a stone processing plant, comprising a fan body (1), the fan body (1) being composed of a housing, a PLC controller (4) and a base (6), wherein an impeller (101) and a bearing are disposed inside the housing, and a drive motor (102) is mounted on the outer end of the housing, the drive motor (102) being connected to the bearing for transmission, characterized in that: An air inlet (2) is provided on the side of the housing, and an air outlet (3) is provided at one end of the housing. The air inlet (2) and the air outlet (3) are connected to form a gas flow channel. The impeller (101) is provided in the gas flow channel to drive the gas flow. The air inlet (2) has a first nozzle group (201) installed on its inner sidewall, and a second nozzle group (103) installed in the area behind the impeller (101). A blowing device (5) is installed on the top of the housing. The blowing device (5) includes a gas compression assembly (501) and a nozzle pipe connected to the gas compression assembly (501). The first nozzle group (201) and the second nozzle group (103) are respectively connected to the gas compression assembly (501) through the nozzle pipe. The blowing device (5) blows compressed gas into the gas flow channel through the first nozzle group (201) and the second nozzle group (103) to remove dust or flammable gas accumulated in the channel and achieve explosion-proof function.

2. The explosion-proof fan for a stone processing plant according to claim 1, characterized in that: The gas compression assembly (501) is equipped with a pressure switch, which is electrically connected to the PLC controller (4) to monitor the working pressure of the gas compression assembly (501) in real time and feed the pressure signal back to the PLC controller (4) to adjust the blowing intensity of the blowing device (5).

3. The explosion-proof fan for a stone processing plant according to claim 1, characterized in that: A laser dust sensor (301) is installed on the bottom wall inside the air outlet (3). The laser dust sensor (301) is electrically connected to the PLC controller (4). The laser dust sensor (301) is used to monitor the dust concentration at the air outlet (3) in real time. When the dust concentration reaches the preset danger value, the PLC controller (4) controls the drive motor (102) to start to the maximum power to accelerate the gas flow, and at the same time triggers the alarm device to issue an audible and visual alarm.

4. The explosion-proof fan for a stone processing plant according to claim 1, characterized in that: The PLC controller (4) has multiple control strategies preset. When the laser dust sensor (301) detects that the dust concentration exceeds the safety threshold but does not reach the danger value, the PLC controller (4) first starts the blowing device (5) to perform intermittent blowing. If the concentration continues to rise to the danger value, the drive motor (102) is further started to the maximum power and an alarm is triggered.

5. The explosion-proof fan for a stone processing plant according to claim 1, characterized in that: A one-way valve is provided at the connection between the nozzle pipe of the blowing device (5) and the first nozzle group (201) and the second nozzle group (103). The one-way valve is used to prevent dust or gas in the gas flow channel from entering the nozzle pipe in reverse, so as to ensure the one-way blowing function of the blowing device (5).

6. The explosion-proof fan for a stone processing plant according to claim 1, characterized in that: A temperature sensor is installed inside the housing, and the temperature sensor is electrically connected to the PLC controller (4). When the temperature inside the housing exceeds the preset safety value, the PLC controller (4) controls the drive motor (102) to stop and starts the spraying device (5) for forced cooling.

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