Dust removal system for tunnel construction

Abstract

The invention relates to the technical field of tunnel dust removal, in particular to a dust removal system for tunnel construction, which comprises a detection unit, a control analysis unit and a dust removal device. The detection unit is used for detecting the dust content in air and the dust thickness on the surface of the filter screen after tunnel construction; the control analysis unit is used for drawing a change curve according to the dust content and calculating dust removal duration; judging whether the dust removal device meets the tunnel dust removal requirement; calculating the theoretical decrease rate of the dust content, and determining the optimal value of the power of the corresponding dust removal device; judging the dust deposition degree of a filter screen in the dust removal device, and adjusting parameters of the dust removal device; the dust removing device comprises a dust collecting module, a filtering module, an air purifying module and a power module. The filtering module comprises a box body, a filtering net, a rotating shaft and a plurality of spraying heads; the air purification module comprises a fan, a silencer and an air supply pipe; the dust collecting module comprises a dust bin and a dust suction opening. The state of the dust removal device is adjusted according to the dust removal effect, so that the dust removal efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel dust removal, and in particular to a dust removal system for tunnel construction. Background Art

[0002] With the continuous advancement of urban construction, tunnel construction has become an important part of urban transportation construction. Trackless transport drilling and blasting has become the main method of mountain tunnel construction due to its flexibility, speed and efficiency. However, trackless transport drilling and blasting tunnel construction will produce a large amount of free silica dust, especially in the four processes of drilling, blasting, spraying concrete and mucking. The dust problem generated during tunnel construction has a great impact on the health of construction workers and the tunnel environment.

[0003] Chinese Patent Publication No.: CN111441816A discloses a tunnel construction dust removal vehicle, including a vehicle body; the vehicle body is respectively provided with a dust suction system for absorbing dust in the tunnel, a dust removal system for filtering and collecting the absorbed dust in the tunnel, and a control room; the control room is provided with a power control system for driving the vehicle body to move and driving the dust suction system to operate; the dust suction system includes a volute-free centrifugal fan and an air intake duct; one end of the dust removal system is connected to the air intake duct, and the other end is connected to the air suction port of the volute-free centrifugal fan; it can be seen that the tunnel construction dust removal vehicle has the following problems: the filter screen in the existing dust removal device is at risk of being blocked by dust, which affects the dust removal efficiency. Summary of the invention

[0004] To this end, the present invention provides a dust removal system for tunnel construction, which is used to overcome the problem that the filter screen in the dust removal device in the prior art is at risk of being blocked by dust, thereby affecting the dust removal efficiency.

[0005] To achieve the above object, the present invention provides a dust removal system for tunnel construction, comprising:

[0006] A detection unit, which is connected to the control and analysis unit, is used to detect the dust content in the air after tunnel construction and the dust thickness on the filter surface and send the detection data to the control and analysis unit;

[0007] A control and analysis unit is connected to the dust removal device, and is used to draw a dust content change curve according to the dust content and calculate the dust removal time; calculate the minimum dust removal time according to the maximum power of the dust removal device, and judge whether the dust removal device meets the tunnel dust removal demand; check the dust content in the tunnel air after the dust removal device reaches the tunnel dust removal target time, calculate the theoretical decrease rate of the dust content, and determine the optimal value of the corresponding dust removal device power; judge the reason for the decrease in dust removal efficiency of the dust removal device, and adjust the cleaning frequency according to the fluctuation of the theoretical decrease rate; adjust the dust removal device parameters according to the thickness of the residual dust on the surface of the filter after cleaning.

[0008] The dust removal device comprises a dust collection module, a filter module, an air purification module and a power module; the filter module comprises a box, a filter screen and a rotating shaft, the filter screen is fixedly connected to the box, and the rotating shaft is connected to the power module; a brush layer for cleaning the filter screen is provided on the rotating shaft, and the brush layer is located above the filter screen; the power module is located outside the box and is used to drive the rotating shaft to rotate; the air purification module is located at the top of the box and comprises a fan, a muffler and an air supply pipe, and is used to introduce air into the box; the dust collection module is located at the bottom of the box and comprises an ash bin and a dust suction port, and is used to receive dust and inhale air;

[0009] Among them, the power of the dust removal device is the power of the fan in the air purification module of the dust removal device, and the parameter of the dust removal device is the rotation speed of the rotating shaft.

[0010] Furthermore, the detection unit detects the change of dust content in the tunnel in real time, and the control and analysis unit draws a curve of the dust content change in the tunnel air over time according to the change of dust content, and calculates the dust removal time required for the dust removal device to reduce the dust content in the tunnel air to the target dust content according to the dust content change curve.

[0011] Further, the control and analysis unit compares the dust removal time with the target time. If the dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal speed of the dust removal device for tunnel construction meets the dust removal requirements.

[0012] If the dust removal time is longer than the target time, the control analysis unit determines that the dust removal speed of the dust removal device for tunnel construction is low, and increases the fan power of the clean air module in the dust removal device according to the ratio of the dust removal time to the target time.

[0013] Furthermore, the control analysis unit calculates the minimum dust removal time of the dust removal device corresponding to when the fan power of the dust removal device is at the maximum value according to the corresponding relationship between the dust removal time and the current fan power of the dust removal device, and compares the minimum dust removal time with the target time.

[0014] If the minimum dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for air meets the dust removal requirements of tunnel construction;

[0015] If the minimum dust removal time is greater than the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for the air does not meet the dust removal requirements of tunnel construction, and sends a signal to increase the number of dust removal devices.

[0016] Furthermore, the detection unit detects the minimum dust content in the air in the tunnel after the dust removal device uses the current fan power to remove dust from the tunnel for a target time, and the control and analysis unit calculates the content difference between the minimum dust content and the target dust content, and compares the content difference with the difference evaluation value.

[0017] If the content difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is within an appropriate range;

[0018] If the content difference is greater than the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is large.

[0019] Furthermore, when the difference between the minimum dust content and the target dust content is large, the control and analysis unit determines that the fan power of the dust removal device is too large, and adjusts the fan power of the dust removal device according to the ratio of the minimum dust content to the target dust content.

[0020] Furthermore, the control and analysis unit determines the theoretical reduction rate of dust content based on the dust content after tunnel construction, the target dust content and the target duration of dust removal. The theoretical reduction rate is the difference between the dust content after tunnel construction and the target dust content divided by the target duration of dust removal, and the optimal value of the fan power of the corresponding dust removal device is calculated based on the theoretical reduction rate.

[0021] Furthermore, the detection unit detects the change of dust content in the tunnel in real time, and the control analysis unit calculates the actual decrease rate of the dust content according to the detected change of the dust content, and calculates the difference between the actual decrease rate and the theoretical decrease rate, and compares the decrease rate difference with the difference evaluation value.

[0022] If the decrease rate difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the decrease degree of the dust removal efficiency of the dust removal device is low;

[0023] If the decrease rate difference is greater than the difference evaluation value, the control and analysis unit determines that the dust removal efficiency of the dust removal device decreases to a high degree, and the degree of decrease exceeds a reasonable error range.

[0024] Furthermore, when the dust removal efficiency of the dust removal device decreases beyond a reasonable error range, the control and analysis unit calculates the dust settling velocity in the tunnel according to the dust content detected by the laser dust meters at different heights and the change value of the dust content per unit time.

[0025] If the dust settling velocity is greater than the preset settling velocity, the control and analysis unit determines that the reason for the decrease in the dust removal efficiency of the dust removal device is that the dust particles in the air are larger, resulting in a higher degree of dust accumulation on the filter. The frequency of cleaning the filter is increased according to the ratio of the actual settling rate to the theoretical settling rate.

[0026] Furthermore, the detection unit detects the thickness of the dust remaining on the surface of the filter after cleaning, and the control and analysis unit compares it with the standard thickness of the dust on the surface of the filter.

[0027] If the thickness of the dust remaining on the filter surface after cleaning is less than or equal to the standard thickness, the control and analysis unit determines that the cleanliness of the filter meets the standard;

[0028] If the thickness of the residual dust on the filter surface after cleaning is greater than the standard thickness, the control analysis unit determines that the cleanliness of the filter does not meet the standard, and increases the brush layer speed by increasing the shaft speed according to the ratio of the dust thickness to the standard thickness.

[0029] Compared with the prior art, the beneficial effect of the present invention lies in that the control and analysis unit determines the changing trend of the dust content in the tunnel air by drawing a dust content change curve, predicts the dust removal time required by the dust removal device, and adjusts the power of the dust removal device in real time according to the dust removal time, thereby ensuring the dust removal effect for tunnel construction and improving the dust removal efficiency.

[0030] Furthermore, if the dust removal device does not meet the dust removal requirements of tunnel construction, the construction time will be extended and the construction progress will be affected. The control and analysis unit quantifies the maximum dust removal capacity of the dust removal device by predicting the minimum value of the dust removal time according to the maximum power of the dust removal device, and determines whether the dust removal capacity of the dust removal device for air meets the dust removal requirements of tunnel construction, which is of great significance for ensuring construction progress, safety, quality, personnel health, and environmental protection.

[0031] Furthermore, in the process of dust removal for tunnel construction, the dust removal power of the dust removal device needs to consider not only the dust removal time and dust removal effect, but also the operation cost and maintenance cost. The control and analysis unit determines the extent to which the minimum dust content is less than the target dust content through the difference evaluation value, and performs a cost-benefit analysis on the dust removal power of the dust removal device to determine the optimal power setting with the lowest long-term operating cost, thereby reducing the energy consumption of the dust removal device, reducing wear and extending the service life of the device.

[0032] Furthermore, the degree of dust accumulation on the filter affects the dust removal efficiency of the dust removal device. The control and analysis unit determines whether the fluctuation of the dust removal speed of the dust removal device is within the normal range based on the difference between the actual descent rate and the theoretical descent rate and the difference evaluation value, and adjusts the frequency of cleaning the filter accordingly, thereby reducing the influence of the dust accumulation degree of the filter on the dust removal efficiency of the dust removal device and increasing the accuracy of dust removal in tunnel construction.

[0033] Furthermore, the size of the dust particles filtered by the filter will affect the ease of cleaning. Generally speaking, the smaller the dust particles, the easier it is to penetrate the filter, but it also means that the dust is more likely to adhere to the filter, forming a layer of dust that is difficult to clean. Therefore, in actual operation, fine dust is often more difficult to clean than coarse dust. The present invention determines the cleanliness of the filter by detecting and comparing the thickness of the dust remaining on the surface of the filter after cleaning, and increases the cleaning ability of the filter by increasing the relative speed of the brush and the filter, thereby increasing the accuracy of cleaning the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a unit connection diagram of a dust removal system for tunnel construction in an embodiment of the present invention;

[0035] Figure 2 It is a schematic structural diagram of a dust removal device in a dust removal system for tunnel construction in an embodiment of the present invention;

[0036] Figure 3 It is a linear schematic diagram of the dust content in the tunnel air changing with time in an embodiment of the present invention;

[0037] Figure 4 This is a flow chart of adjusting the fan power of the dust removal device according to the difference in dust content in an embodiment of the present invention;

[0038] In the figure: 1-box, 2-filter, 3-rotating shaft, 4-brush layer, 5-power module, 6-fan, 7-muffler, 8-air supply pipe, 9-ash bin, 10-dust suction port. DETAILED DESCRIPTION

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figure 1-Figure 4 As shown, Figure 1 This is a unit connection diagram of a dust removal system for tunnel construction in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a dust removal device in a dust removal system for tunnel construction in an embodiment of the present invention;

[0044] Figure 3 It is a linear schematic diagram of the dust content in the tunnel air changing with time in an embodiment of the present invention; Figure 4 The figure is a flow chart of adjusting the fan power of the dust removal device according to the difference in dust content in an embodiment of the present invention.

[0045] The present invention provides a dust removal system for tunnel construction, comprising:

[0046] A detection unit, which is connected to the control and analysis unit, is used to detect the dust content in the air after tunnel construction and the dust thickness on the surface of the filter 2 and send the detection data to the control and analysis unit;

[0047] A control and analysis unit is connected to the dust removal device, and is used to draw a dust content change curve according to the dust content and calculate the dust removal time; calculate the minimum dust removal time according to the maximum power of the dust removal device, and judge whether the dust removal device meets the tunnel dust removal demand; check the dust content in the tunnel air after the dust removal device reaches the tunnel dust removal target time, calculate the theoretical decrease rate of the dust content, and determine the optimal value of the corresponding dust removal device power; judge the reason for the decrease in the dust removal efficiency of the dust removal device, and adjust the cleaning frequency according to the fluctuation of the theoretical decrease rate; adjust the dust removal device parameters according to the thickness of the residual dust on the surface of the filter 2 after cleaning.

[0048] The dust removal device includes a dust collection module, a filter module, an air purification module and a power module 5; the filter module includes a housing 1, a filter screen 2 and a rotating shaft 3, the filter screen 2 is fixedly connected in the housing 1, and the rotating shaft 3 is connected to the power module 5; a brush layer 4 for cleaning the filter screen 2 is provided on the rotating shaft 3, and the brush layer 4 is located above the filter screen 2; the power module 5 is located outside the housing 1, and is used to drive the rotating shaft 3 to rotate; the air purification module is located at the top of the housing 1, and includes a fan 6, a muffler 7 and an air supply pipe 8, which are used to introduce air into the housing 1; the dust collection module is located at the bottom of the housing 1, and includes an ash bin 9 and a dust suction port 10, which are used to receive dust and inhale air.

[0049] In this embodiment, the dust removal system is started after the tunnel construction trackless transportation drilling and blasting. The detection unit uses a microcomputer laser dust meter (LD-3C) to detect the change of dust content in the tunnel in real time after the dust removal system is started. The control and analysis unit draws a curve of the change of dust content in the tunnel air over time according to the change of dust content, and calculates the dust removal time required for the dust removal device to reduce the dust content in the tunnel air to the target dust content according to the dust content change curve;

[0050] The dust content variation curve can be approximated as a linear function, and its linear schematic diagram is shown in Figure 3 As shown, N0 is the dust content in the air after drilling and blasting of trackless transportation in tunnel construction, te is the target duration of tunnel dust removal, Ne is the target dust content, N1 and N2 are the dust contents in the tunnel air after the dust removal device removes the dust in the tunnel for the target duration at different powers, t1 is the dust removal time required for the dust removal device to reduce the dust content in the tunnel air to the target dust content, S is the dust content difference, and A1 and A2 are linear functions of the dust content change curve of the dust removal device at different powers;

[0051] Specifically, according to the tunnel construction environment standard requirements, the dust content in the tunnel needs to be less than 4mg / m 3 The control and analysis unit calculates the rate of decrease of the dust content in a unit time according to the dust content change curve in the tunnel air, and the rate of decrease is equal to the dust content difference in the unit time interval of the content change curve divided by the unit time. The control and analysis unit calculates the dust removal time required for the dust removal device to reduce the dust content in the tunnel air to the target dust content according to the current dust content, the target dust content and the rate of decrease of the dust content;

[0052] For example, the current dust content is 1000mg / m3 and the target dust content is 50mg / m3. According to calculations, the dust content decreases by 10% per minute, and the time required is equal to the logarithm of the ratio of the current dust content to the target dust content divided by one and the logarithm of the difference between the dust content decrease rate.

[0053] In this example, the time required is log(1000 / 50) / log(1-0.1), which is approximately equal to 28.4 minutes, so it takes approximately 28.4 minutes to reduce the dust content from 1000 mg / m3 to 50 mg / m3.

[0054] The control and analysis unit compares the dust removal time with the target time. If the dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal speed of the dust removal device for tunnel construction meets the dust removal requirements.

[0055] If the dust removal time is longer than the target time, the control and analysis unit determines that the dust removal speed of the dust removal device for tunnel construction is low, and increases the power of the fan 6 of the clean air module in the dust removal device according to the ratio of the dust removal time to the target time.

[0056] Specifically, the control and analysis unit determines the changing trend of dust content in tunnel air by drawing a dust content change curve, predicts the dust removal time required by the dust removal device, and adjusts the power of the dust removal device in real time according to the dust removal time, so as to ensure the dust removal effect for tunnel construction and improve the dust removal efficiency.

[0057] The control and analysis unit calculates the minimum dust removal time of the dust removal device corresponding to the maximum fan power of the dust removal device according to the corresponding relationship between the dust removal time and the current fan power of the dust removal device, and compares the minimum dust removal time with the target time. The minimum dust removal time is equal to the current dust removal time divided by the ratio of the maximum fan power to the current fan power.

[0058] If the minimum dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for air meets the dust removal requirements of tunnel construction;

[0059] If the minimum dust removal time is greater than the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for the air does not meet the dust removal requirements of tunnel construction, and sends a signal to increase the number of dust removal devices.

[0060] Specifically, if the dust removal device does not meet the dust removal needs of tunnel construction, the construction time will be extended and the construction progress will be affected. The control and analysis unit predicts the minimum value of the dust removal time according to the maximum power of the dust removal device, quantifies the maximum dust removal capacity of the dust removal device, and determines whether the dust removal capacity of the dust removal device for air meets the dust removal needs of tunnel construction, which is of great significance for ensuring construction progress, safety, quality, personnel health, and environmental protection.

[0061] The detection unit detects the minimum dust content in the air in the tunnel after the dust removal device uses the current fan power to remove dust from the tunnel for a target time. The control and analysis unit calculates the difference between the minimum dust content and the target dust content, and compares the content difference with the difference evaluation value.

[0062] If the content difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is within an appropriate range;

[0063] If the content difference is greater than the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is large, and the current dust removal device fan power is too large, and adjusts the fan power of the dust removal device according to the ratio of the minimum dust content to the target dust content.

[0064] The difference evaluation value is the maximum error value that may be caused by the dust removal device in the tunnel dust removal process.

[0065] The control and analysis unit determines a theoretical reduction rate of dust content according to the dust content after tunnel construction, the target dust content and the target duration of dust removal, wherein the theoretical reduction rate is the difference between the dust content after tunnel construction and the target dust content divided by the target duration of dust removal, and calculates the optimal value of the fan power of the corresponding dust removal device according to the theoretical reduction rate;

[0066] Regarding the calculation of the dust content reduction rate and the fan power of the dust removal device in the present invention, those skilled in the art can fit the corresponding relationship between the dust content reduction rate and the fan power of the dust removal device through theoretical calculation or several experiments according to actual needs, and then calculate the fan power of the dust removal device according to the reduction rate.

[0067] Specifically, in the process of dust removal for tunnel construction, the dust removal power of the dust removal device needs to consider not only the dust removal time and dust removal effect, but also the operation cost and maintenance cost. The control and analysis unit determines the extent to which the minimum dust content is less than the target dust content through the difference evaluation value, and conducts a cost-benefit analysis on the dust removal power of the dust removal device to determine the optimal power setting with the lowest long-term operating cost, thereby reducing the energy consumption of the dust removal device, reducing wear and extending the service life of the device.

[0068] The detection unit detects the change of dust content in the tunnel in real time, and the control analysis unit calculates the actual decrease rate of dust content according to the detected change of dust content, and calculates the difference between the actual decrease rate and the theoretical decrease rate, and compares the decrease rate difference with the difference evaluation value.

[0069] If the decrease rate difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the decrease degree of the dust removal efficiency of the dust removal device is low and the decrease degree is within a reasonable error range;

[0070] If the decrease rate difference is greater than the difference evaluation value, the control and analysis unit determines that the dust removal efficiency of the dust removal device has decreased to a high degree, and the decrease degree exceeds the reasonable error range, and the control and analysis unit checks the reason for the decrease in the dust removal efficiency of the dust removal device;

[0071] The difference evaluation value is the difference in the reduction rate of dust content corresponding to the maximum error value that may be caused by the dust removal device in the tunnel dust removal process.

[0072] The detection unit is provided with laser dust monitors at different heights of the tunnel, and the control and analysis unit calculates the dust settling speed in the tunnel according to the dust content detected by the laser dust monitors at different heights and the change value of the dust content per unit time.

[0073] If the dust settling speed is greater than the preset settling speed, the control and analysis unit determines that the reason for the decrease in dust removal efficiency of the dust removal device is that the dust particles in the air are large, resulting in a high degree of dust accumulation on the filter 2, and increases the frequency of cleaning the filter 2 according to the ratio of the actual settling rate to the theoretical settling rate;

[0074] The settling velocity is positively correlated with the change in dust content per unit time and the height difference of the laser dust meter.

[0075] Specifically, the dust accumulation degree of the filter 2 affects the dust removal efficiency of the dust removal device. The control and analysis unit determines whether the fluctuation of the dust removal speed of the dust removal device is within the normal range according to the difference between the actual decrease rate and the theoretical decrease rate and the difference evaluation value, and adjusts the frequency of cleaning the filter 2 accordingly, thereby reducing the influence of the dust accumulation degree of the filter 2 on the dust removal efficiency of the dust removal device and increasing the accuracy of dust removal in tunnel construction.

[0076] The detection unit detects the thickness of the dust remaining on the surface of the filter screen 2 after cleaning, and the control and analysis unit compares it with the standard thickness of 1 mm of the dust on the surface of the filter screen 2.

[0077] If the thickness of the dust remaining on the surface of the filter screen 2 after cleaning is less than or equal to the standard thickness of 1 mm, the control and analysis unit determines that the cleanliness of the filter screen 2 meets the standard;

[0078] If the thickness of the dust remaining on the surface of the filter 2 after cleaning is greater than the standard thickness of 1 mm, the control and analysis unit determines that the cleanliness of the filter 2 does not meet the standard, and increases the speed of the rotating shaft 3 and the speed of the brush layer 4 according to the ratio of the dust thickness to the standard thickness of 1 mm.

[0079] Specifically, the size of the dust particles filtered by the filter 2 will affect the difficulty of cleaning. Generally speaking, the smaller the dust particles, the easier it is to penetrate the filter 2, but it also means that these dust particles are more likely to adhere to the filter 2, forming a dust layer that is difficult to clean. Therefore, in actual operation, fine dust is often more difficult to clean than coarse dust. The present invention determines the cleanliness of the filter 2 by detecting and comparing the thickness of the dust remaining on the surface of the filter 2 after cleaning, and increases the cleaning ability of the filter 2 by increasing the relative speed of the brush and the filter 2, thereby increasing the accuracy of cleaning the filter 2.

[0080] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dust removal system for tunnel construction, characterized in that: include: A detection unit, which is connected to the control and analysis unit, is used to detect the dust content in the air after tunnel construction and the dust thickness on the filter surface and send the detection data to the control and analysis unit; A control and analysis unit connected to the dust removal device is used to draw a dust content change curve according to the dust content and calculate the dust removal time; calculate the minimum dust removal time according to the maximum power of the dust removal device, and judge whether the dust removal device meets the dust removal requirements of the tunnel; check the dust content in the tunnel air after the dust removal device reaches the tunnel dust removal target time, calculate the theoretical decrease rate of the dust content, and determine the optimal value of the corresponding dust removal device power; judge the reason for the decrease in the dust removal efficiency of the dust removal device, and adjust the frequency of cleaning according to the fluctuation of the theoretical decrease rate; adjust the dust removal device parameters according to the thickness of the residual dust on the surface of the filter after cleaning; The dust removal device comprises a dust collection module, a filter module, an air purification module and a power module; the filter module comprises a box, a filter screen and a rotating shaft, the filter screen is fixedly connected to the box, and the rotating shaft is connected to the power module; a brush layer for cleaning the filter screen is provided on the rotating shaft, and the brush layer is located above the filter screen; the power module is located outside the box and is used to drive the rotating shaft to rotate; the air purification module is located at the top of the box and comprises a fan, a muffler and an air supply pipe, and is used to introduce air into the box; the dust collection module is located at the bottom of the box and comprises an ash bin and a dust suction port, and is used to receive dust and inhale air; Among them, the power of the dust removal device is the power of the fan in the air purification module of the dust removal device, and the parameter of the dust removal device is the rotation speed of the rotating shaft.

2. The dust removal system for tunnel construction according to claim 1, characterized in that: The detection unit detects the change of dust content in the tunnel in real time, and the control and analysis unit draws a curve of the dust content change in the tunnel air over time according to the change of dust content, and calculates the dust removal time required for the dust removal device to reduce the dust content in the tunnel air to the target dust content according to the dust content change curve.

3. The dust removal system for tunnel construction according to claim 2, characterized in that: The control and analysis unit compares the dust removal time with the target time. If the dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal speed of the dust removal device for tunnel construction meets the dust removal requirements. If the dust removal time is longer than the target time, the control analysis unit determines that the dust removal speed of the dust removal device for tunnel construction is low, and increases the fan power of the clean air module in the dust removal device according to the ratio of the dust removal time to the target time.

4. The dust removal system for tunnel construction according to claim 1, characterized in that: The control and analysis unit calculates the minimum dust removal time of the dust removal device corresponding to the maximum dust removal time according to the corresponding relationship between the dust removal time and the current fan power of the dust removal device, and compares the minimum dust removal time with the target time. If the minimum dust removal time is less than or equal to the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for air meets the dust removal requirements of tunnel construction; If the minimum dust removal time is greater than the target time, the control and analysis unit determines that the dust removal capacity of the dust removal device for the air does not meet the dust removal requirements of tunnel construction, and sends a signal to increase the number of dust removal devices.

5. The dust removal system for tunnel construction according to claim 1, characterized in that: The detection unit detects the minimum dust content in the air in the tunnel after the dust removal device uses the current fan power to remove dust from the tunnel for a target time. The control and analysis unit calculates the difference between the minimum dust content and the target dust content, and compares the content difference with the difference evaluation value. If the content difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is within an appropriate range; If the content difference is greater than the difference evaluation value, the control and analysis unit determines that the content difference between the minimum dust content and the target dust content is large.

6. The dust removal system for tunnel construction according to claim 1, characterized in that: When the difference between the minimum dust content and the target dust content is large, the control and analysis unit determines that the fan power of the dust removal device is too large, and adjusts the fan power of the dust removal device according to the ratio of the minimum dust content to the target dust content.

7. The dust removal system for tunnel construction according to claim 1, characterized in that: The control and analysis unit determines a theoretical reduction rate of dust content according to the dust content after tunnel construction, the target dust content and the target duration of dust removal. The theoretical reduction rate is the difference between the dust content after tunnel construction and the target dust content divided by the target duration of dust removal, and calculates the optimal value of the fan power of the corresponding dust removal device according to the theoretical reduction rate.

8. The dust removal system for tunnel construction according to claim 1, characterized in that: The detection unit detects the change of dust content in the tunnel in real time, and the control analysis unit calculates the actual decrease rate of dust content according to the detected change of dust content, and calculates the difference between the actual decrease rate and the theoretical decrease rate, and compares the decrease rate difference with the difference evaluation value. If the decrease rate difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the decrease degree of the dust removal efficiency of the dust removal device is low; If the decrease rate difference is greater than the difference evaluation value, the control and analysis unit determines that the dust removal efficiency of the dust removal device decreases to a high degree, and the degree of decrease exceeds a reasonable error range.

9. The dust removal system for tunnel construction according to claim 1, characterized in that: When the dust removal efficiency of the dust removal device decreases beyond a reasonable error range, the control and analysis unit calculates the dust settling speed in the tunnel according to the dust content detected by the laser dust monitors at different heights and the change value of the dust content per unit time. If the dust settling velocity is greater than the preset settling velocity, the control and analysis unit determines that the reason for the decrease in the dust removal efficiency of the dust removal device is that the dust particles in the air are larger, resulting in a higher degree of dust accumulation on the filter. The frequency of cleaning the filter is increased according to the ratio of the actual settling rate to the theoretical settling rate.

10. The dust removal system for tunnel construction according to claim 1, characterized in that: The detection unit detects the thickness of the dust remaining on the filter surface after cleaning, and the control and analysis unit compares it with the standard thickness of the dust on the filter surface. If the thickness of the dust remaining on the filter surface after cleaning is less than or equal to the standard thickness, the control and analysis unit determines that the cleanliness of the filter meets the standard; If the thickness of the residual dust on the filter surface after cleaning is greater than the standard thickness, the control analysis unit determines that the cleanliness of the filter does not meet the standard, and increases the brush layer speed by increasing the shaft speed according to the ratio of the dust thickness to the standard thickness.

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