A dust removal system for tunnel construction

Abstract

The present invention relates to the technical field of tunnel dust removal, and particularly to a dust removal system for tunnel construction, which includes a detection unit, a control and analysis unit, and a dust removal device. The detection unit is used to detect the dust content in the air after tunnel construction and the dust thickness on the surface of the filter screen; the control and analysis unit is used to draw a change curve based on the dust content and calculate the dust removal duration; determine whether the dust removal device meets the tunnel dust removal requirements; calculate the theoretical decline rate of the dust content and determine the optimal value of the corresponding dust removal device power; judge the dust accumulation degree of the filter screen in the dust removal device and adjust the parameters of the dust removal device; the dust removal device includes an ash collection module, a filtration module, a clean air module, and a power module; the filtration module includes a box body, a filter screen, a rotating shaft, and a plurality of spray heads; the clean air module includes a fan, a silencer, and an air supply pipe; the ash collection module includes an ash bin and a dust suction port. The present invention improves the dust removal efficiency by adjusting the state of the dust removal device according to the dust removal effect.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel dust removal, and particularly 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. The trackless transportation drill and blast method has become the main method for mountain tunnel construction due to its flexibility, speed, and high efficiency. However, a large amount of free silica dust is generated during the tunnel construction of the trackless transportation drill and blast method, especially the dust content in the four processes of drilling, blasting, shotcreting, and mucking is the highest. The dust problem generated during the tunnel construction process 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; 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 centralized control room are respectively arranged on the vehicle body; a power control system for driving the vehicle body to travel and driving the dust suction system to operate is arranged in the centralized control room; the dust suction system includes a volute-less centrifugal fan and an intake pipe; one end of the dust removal system is communicated with the intake pipe, and the other end is connected with the suction port of the volute-less centrifugal fan; thus, the following problems exist in the tunnel construction dust removal vehicle: there is a risk that the filter screen in the existing dust removal device is blocked by dust, affecting the dust removal efficiency. Summary of the Invention

[0004] Therefore, the present invention provides a dust removal system for tunnel construction 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, affecting the dust removal efficiency.

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

[0006] A detection unit, which is connected to a control and analysis unit, is used for detecting the dust content in the air after tunnel construction and the dust thickness on the surface of the filter screen and sending the detection data to the control and analysis unit;

[0007] A control and analysis unit, which is connected to a dust removal device, is used for drawing a dust content change curve according to the dust content and calculating the dust removal duration; calculating the minimum dust removal duration according to the maximum power value of the dust removal device, and judging whether the dust removal device meets the tunnel dust removal requirements; testing the dust content in the tunnel air after the dust removal device has reached the target dust removal duration, calculating the theoretical dust content decline rate, and determining the optimal value of the corresponding dust removal device power; judging the reason for the decline in the dust removal efficiency of the dust removal device, and adjusting the dust cleaning frequency according to the fluctuation of the theoretical decline rate; adjusting the dust removal device parameters according to the dust thickness remaining on the surface of the filter screen after dust cleaning.

[0008] The dust removal device includes an ash collection module, a filtration module, a clean air module, and a power module; the filtration module includes a box body, a filter net, and a rotating shaft. The filter net is fixedly connected inside the box body, and the rotating shaft is connected to the power module; a brush layer for cleaning the filter net is provided on the rotating shaft, and the brush layer is located above the filter net; the power module is located outside the box body and is used to drive the rotating shaft to rotate; the clean air module is located at the top of the box body and includes a fan, a muffler, and an air supply pipe for introducing air into the box body; the ash collection module is located at the bottom of the box body and includes an ash bin and a dust suction port for receiving dust and sucking in air;

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

[0010] Further, the detection unit detects the change in the dust content in the tunnel in real time. The control and analysis unit draws a curve of the dust content in the tunnel air changing with time according to the change in the dust content, and calculates the dust removal duration 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 duration with the target duration. If the dust removal duration is less than or equal to the target duration, 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 duration is greater than the target duration, the control and 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 duration to the target duration.

[0013] Further, the control and analysis unit calculates the minimum dust removal time corresponding to the maximum fan power of the dust removal device according to the correspondence 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 duration.

[0014] If the minimum dust removal time is less than or equal to the target duration, the control and analysis unit determines that the dust removal ability 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 duration, the control and analysis unit determines that the dust removal ability of the dust removal device for air does not meet the dust removal requirements of tunnel construction, and sends a signal to increase the number of dust removal devices.

[0016] Further, the detection unit detects the minimum value of the dust content in the tunnel air after the dust removal device operates at the current fan power for the target duration of tunnel dust removal. The control and analysis unit calculates the content difference between the minimum value of the 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 value of the 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 value of the dust content and the target dust content is large.

[0019] Further, when the content difference between the minimum value of the 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 high, and adjusts the fan power of the dust removal device according to the ratio of the minimum value of the dust content to the target dust content.

[0020] Further, the control and analysis unit determines the theoretical decline rate of the dust content according to the dust content after tunnel construction, the target dust content, and the target duration of dust removal. The theoretical decline 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 decline rate.

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

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

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

[0024] Further, when the degree of decline in the dust removal efficiency of the dust removal device exceeds the reasonable error range, the control and analysis unit calculates the sedimentation velocity of the dust 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 sedimentation velocity of the dust is greater than the preset sedimentation velocity, the control and analysis unit determines that the reason for the decline in the dust removal efficiency of the dust removal device is that the dust particle size in the air is relatively large, resulting in a relatively high degree of dust accumulation on the filter screen, and increases the cleaning frequency of the filter screen according to the ratio of the actual decline rate to the theoretical decline rate.

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

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

[0028] If the thickness of the residual dust on the surface of the filter screen after dust cleaning is greater than the standard thickness, the control and analysis unit determines that the cleaning degree of the filter screen does not meet the standard, and increases the speed of the brush layer by increasing the rotation speed of the rotating shaft 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 is that the control and analysis unit judges the change trend of the dust content in the tunnel air by drawing the change curve of the dust content, predicts the dust removal duration required by the dust removal device, and adjusts the power of the dust removal device in real time according to the size of the dust removal duration, ensuring the dust removal effect for tunnel construction dust removal and improving the dust removal efficiency.

[0030] Further, if the dust removal device does not meet the dust removal requirements of tunnel construction, the construction time will be extended, affecting the construction progress. The control and analysis unit predicts the minimum dust removal time according to the maximum power value of the dust removal device, quantifies the maximum dust removal capacity of the dust removal device, and judges whether the dust removal capacity of the dust removal device for the 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] Further, during 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 judges the degree 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 operation cost, reducing the energy consumption of the dust removal device, reducing wear and extending the service life of the device.

[0032] Further, the dust accumulation degree of the filter screen affects the dust removal efficiency of the dust removal device. The control and analysis unit judges 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 decline rate and the theoretical decline rate and the difference evaluation value, and correspondingly adjusts the cleaning frequency of the filter screen, reducing the influence of the dust accumulation degree of the filter screen on the dust removal efficiency of the dust removal device and increasing the accuracy of dust removal for tunnel construction.

[0033] Furthermore, the size of the dust particles filtered by the filter screen affects the ease of cleaning. Generally speaking, the smaller the dust particles, the easier it is for them to penetrate the filter screen, but at the same time, it also means that these dust particles are more likely to adhere to the filter screen, 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 screen by detecting and comparing the thickness of the residual dust on the surface of the filter screen after dust cleaning, and increases the cleaning ability of the filter screen by increasing the relative speed between the brush and the filter screen, thereby increasing the accuracy of cleaning the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0036] Figure 3 It is a linear schematic diagram of the change curve of the dust content in the tunnel air over time in the embodiment of the present invention;

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

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

[0039] In order to make the purpose and advantages of the present invention clearer, the present invention will be 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 will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0041] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "up", "down", "left", "right", "inside", "outside", etc. are based on the direction or positional relationship shown in the drawings. This is only 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, and therefore cannot be understood as a limitation to the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can be the communication inside 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] Please refer to Figures 1 - 4 as shown in Figure 1 which is the unit connection diagram of the dust removal system for tunnel construction in the embodiment of the present invention; Figure 2 which is the structural schematic diagram of the dust removal device in the dust removal system for tunnel construction in the embodiment of the present invention;

[0044] Figure 3 which is the linear schematic diagram of the curve of the dust content in the tunnel air changing with time in the embodiment of the present invention; Figure 4 which is the flowchart of adjusting the fan power of the dust removal device according to the difference in dust content in the embodiment of the present invention.

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

[0046] a detection unit, which is connected to the control and analysis unit, and is used for detecting the dust content in the air after tunnel construction and the dust thickness on the surface of the filter screen 2 and sending the detection data to the control and analysis unit;

[0047] a control and analysis unit, which is connected to the dust removal device, and is used for drawing a curve of the dust content change according to the dust content and calculating the dust removal duration; calculating the minimum dust removal duration according to the maximum power of the dust removal device to judge whether the dust removal device meets the tunnel dust removal requirements; testing the dust content in the tunnel air after the dust removal device has dusted for the target duration, calculating the theoretical decline rate of the dust content, and determining the optimal value of the corresponding dust removal device power; judging the reason for the decline in the dust removal efficiency of the dust removal device and adjusting the dust cleaning frequency according to the fluctuation of the theoretical decline rate; adjusting the parameters of the dust removal device according to the thickness of the residual dust on the surface of the filter screen 2 after dust cleaning.

[0048] a dust removal device, including a dust collection module, a filtering module, a clean air module, and a power module 5; the filtering module includes a box body 1, a filter screen 2, and a rotating shaft 3, the filter screen 2 is fixedly connected inside the box body 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 box body 1 and is used for driving the rotating shaft 3 to rotate; the clean air module is located at the top of the box body 1 and includes a fan 6, a silencer 7, and an air supply pipe 8, and is used for introducing air into the box body 1; the dust collection module is located at the bottom of the box body 1 and includes an ash bin 9 and a dust suction port 10, and is used for receiving dust and inhaling air.

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

[0050] The curve of the dust content change can be approximated as a linear function, and its linear schematic diagram is as Figure 3 shown, where N0 is the dust content in the air after the trackless transportation blasting 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 tunnel dust removal target duration by the dust removal device at different powers, t1 is the dust removal duration required for the dust removal device to reduce the dust content in the tunnel air to the target dust content, S is the content difference of the dust content, and A1 and A2 are the linear functions of the curves of the dust content change by the dust removal device at different powers;

[0051] Specifically, according to the requirements of the tunnel construction environment standard, the dust content in the tunnel needs to be less than 4mg / m 3 , and the control and analysis unit calculates the reduction rate of the dust content per unit time according to the curve of the dust content change in the tunnel air. The reduction rate 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 duration 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 reduction rate of the dust content;

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

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

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

[0055] If the dust removal duration is greater than the target duration, the control and analysis unit is controlled to determine that the dust removal speed of the dust removal device for tunnel construction is low, and the power of the fan 6 of the clean air module in the dust removal device is increased according to the ratio of the dust removal duration to the target duration.

[0056] Specifically, the control and analysis unit judges the change trend of the dust content in the tunnel air by drawing a dust content change curve, predicts the dust removal duration required by the dust removal device, and adjusts the power of the dust removal device in real time according to the size of the dust removal duration, 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 corresponding to the dust removal device 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 duration. 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 duration, the control and analysis unit judges that the dust removal ability of the dust removal device for the air meets the dust removal requirements of tunnel construction.

[0059] If the minimum dust removal time is greater than the target duration, the control and analysis unit judges that the dust removal ability 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 requirements of tunnel construction, the construction time will be extended, affecting the construction progress. The control and analysis unit predicts the minimum dust removal time according to the maximum power of the dust removal device, quantifies the maximum dust removal ability of the dust removal device, and judges whether the dust removal ability of the dust removal device for the air meets the dust removal requirements of tunnel construction, which is of great significance for ensuring the construction progress, safety, quality, personnel health and environmental protection.

[0061] The detection unit detects the minimum value of the dust content in the tunnel air after the dust removal device removes dust from the tunnel for the target duration at the current fan power. The control and analysis unit calculates the content difference between the minimum value of the 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 judges that the content difference between the minimum value of the 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 judges that the content difference between the minimum value of the dust content and the target dust content is large, and the current 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 value of the dust content to the target dust content.

[0064] Among them, the difference evaluation value is the maximum value of the error value that may be caused during the tunnel dust removal process by the dust removal device.

[0065] The control and analysis unit determines the theoretical dust content decline rate according to the dust content after tunnel construction, the target dust content, and the target duration of dust removal. The theoretical dust content decline 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 dust content decline rate;

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

[0067] Specifically, during 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 operating cost and maintenance cost. The control and analysis unit judges the degree 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, 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 in the dust content in the tunnel in real time. The control and analysis unit calculates the actual dust content decline rate according to the detected change in the dust content, calculates the difference between the actual dust content decline rate and the theoretical dust content decline rate, and compares the decline rate difference with the difference evaluation value.

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

[0070] If the decline rate difference is greater than the difference evaluation value, the control and analysis unit judges that the decline degree of the dust removal efficiency of the dust removal device is relatively high, and the decline degree exceeds the reasonable error range. The control and analysis unit checks the reason for the decline in the dust removal efficiency of the dust removal device.

[0071] Among them, the difference evaluation value is the decline rate difference of the dust content corresponding to the maximum value of the error value that may be caused during the tunnel dust removal process by the dust removal device.

[0072] The detection unit is provided with laser dust meters at different heights in the tunnel. The control and analysis unit calculates the sedimentation velocity of the dust 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.

[0073] If the sedimentation velocity of the dust is greater than the preset sedimentation 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 particle size in the air is relatively large, resulting in a relatively high degree of dust accumulation on the filter net 2, and increases the cleaning frequency of the filter net 2 according to the ratio of the actual decrease rate to the theoretical decrease rate;

[0074] Among them, the sedimentation velocity is positively correlated with the change value of the dust content per unit time and the height difference of the laser dust detector.

[0075] Specifically, the degree of dust accumulation on the filter net 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 correspondingly adjusts the cleaning frequency of the filter net 2, reducing the influence of the degree of dust accumulation on the filter net 2 on the dust removal efficiency of the dust removal device, and increasing the accuracy of tunnel construction dust removal.

[0076] The detection unit detects the thickness of the residual dust on the surface of the filter net 2 after dust 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 net 2.

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

[0078] If the thickness of the residual dust on the surface of the filter net 2 after dust cleaning is greater than the standard thickness of 1 mm, the control and analysis unit determines that the cleaning degree of the filter net 2 does not meet the standard, and increases the rotation 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 net 2 affects the difficulty of cleaning. Generally speaking, the smaller the dust particles, the easier it is to penetrate the filter net 2, but at the same time, it also means that these dusts are more likely to adhere to the filter net 2, 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 cleaning degree of the filter net 2 by detecting and comparing the thickness of the residual dust on the surface of the filter net 2 after dust cleaning, and increases the cleaning ability of the filter net 2 by increasing the relative speed of the brush and the filter net 2, thereby increasing the accuracy of cleaning the filter net 2.

[0080] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the 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 all fall within the protection scope of the present invention.

[0081] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention; for those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dust removal system for tunnel construction, characterized in that, Including: A detection unit, which is connected to a control and analysis unit, and is used to detect the dust content in the air after tunnel construction and the dust thickness on the surface of the filter screen, and send the detection data to the control and analysis unit; A control and analysis unit, which is connected to a dust removal device, and is used to draw a dust content change curve according to the dust content and calculate the dust removal duration; calculate the minimum dust removal duration according to the maximum power of the dust removal device, and judge whether the dust removal device meets the tunnel dust removal requirements; test the dust content in the tunnel air after the tunnel dust removal target duration, calculate the theoretical dust content reduction rate, 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 dust cleaning frequency according to the fluctuation of the theoretical dust content reduction rate; adjust the dust removal device parameters according to the thickness of the residual dust on the surface of the filter screen after dust cleaning; The dust removal device includes an ash collection module, a filtration module, a clean air module and a power module; the filtration module includes a box body, a filter screen and a rotating shaft, the filter screen is fixedly connected in the box body, and the rotating shaft is connected to the power module; a brush layer for cleaning the filter screen is arranged on the rotating shaft, and the brush layer is located above the filter screen; the power module is located outside the box body and is used to drive the rotating shaft to rotate; the clean air module is located at the top of the box body and includes a fan, a silencer and an air supply pipe for introducing air into the box body; the ash collection module is located at the bottom of the box body and includes an ash bin and a dust suction port for receiving dust and sucking in air; Wherein, the power of the dust removal device is the power of the fan in the clean air module of the dust removal device, and the parameter of the dust removal device is the rotation speed of the rotating shaft; The control and analysis unit determines the theoretical dust content reduction rate according to the dust content after tunnel construction, the target dust content and the target dust removal duration. The theoretical dust content reduction rate is the difference between the dust content after tunnel construction and the target dust content divided by the target dust removal duration, and calculates the optimal value of the fan power of the corresponding dust removal device according to the theoretical dust content reduction rate; The detection unit detects the change of the dust content in the tunnel in real time. The control and analysis unit calculates the actual dust content reduction rate according to the detected change of the dust content, calculates the difference between the actual dust content reduction rate and the theoretical dust content reduction rate, and compares the reduction rate difference with the difference evaluation value. If the reduction rate difference is less than or equal to the difference evaluation value, the control and analysis unit determines that the reduction degree of the dust removal efficiency of the dust removal device is relatively low; If the reduction rate difference is greater than the difference evaluation value, the control and analysis unit determines that the reduction degree of the dust removal efficiency of the dust removal device is relatively high, and the reduction degree exceeds the reasonable error range; When the reduction degree of the dust removal efficiency of the dust removal device exceeds the reasonable error range, the control and analysis unit calculates the dust settlement speed in the tunnel according to the dust content detected by the laser dust meter at different heights and the change value of the dust content per unit time. If the dust settlement speed is greater than the preset settlement speed, 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 particle size in the air is relatively large, resulting in a relatively high degree of dust accumulation on the filter screen, and increases the cleaning frequency of the filter screen according to the ratio of the actual dust content reduction rate to the theoretical dust content reduction rate.

2. The tunnel construction dust removal system according to claim 1, wherein The detection unit detects the change in the dust content in the tunnel in real time. The control and analysis unit draws a curve of the dust content in the tunnel air changing with time according to the change in the dust content, and calculates the dust removal duration 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, wherein the control and analysis unit compares the dust removal duration with the target duration. If the dust removal duration is less than or equal to the target duration, the control and analysis unit determines that the dust removal speed of the dust removal device meets the dust removal requirements for tunnel construction; if the dust removal duration is greater than the target duration, the control and 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 duration to the target duration.

4. The dust removal system for tunnel construction according to claim 1, wherein the control and 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 duration. If the minimum dust removal time is less than or equal to the target duration, the control and analysis unit determines that the dust removal ability of the dust removal device for air meets the dust removal requirements for tunnel construction; if the minimum dust removal time is greater than the target duration, the control and analysis unit determines that the dust removal ability of the dust removal device for air does not meet the dust removal requirements for 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, wherein the detection unit detects the minimum dust content in the tunnel air after the dust removal device performs dust removal on the tunnel for the target duration at the current fan power. 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. 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, wherein when the content 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, wherein the detection unit detects the thickness of the residual dust on the surface of the filter screen after dust cleaning. The control and analysis unit compares it with the standard thickness of the dust on the surface of the filter screen. If the thickness of the residual dust on the surface of the filter screen after dust cleaning is less than or equal to the standard thickness, the control and analysis unit determines that the cleanliness of the filter screen meets the standard; If the thickness of the dust remaining on the surface of the filter screen after dust cleaning is greater than the standard thickness, the control and analysis unit determines that the cleaning degree of the filter screen does not meet the standard, and increases the speed of the brush layer by increasing the rotation speed of the rotating shaft according to the ratio of the dust thickness to the standard thickness.

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