An engineering machine water filtration self-cleaning control system

Abstract

The application provides an engineering machinery water filtering self-cleaning control system, comprising: a water supply pipeline, which is sequentially provided with a water pipe reel, a turbidity sensor, a flow sensor, a water filter, a safety valve, a heat exchanger, a water pump, a water pipeline ball valve, a stop valve and a rock drill in sequence along a water flow direction, and the pipeline circulates water containing silt. A controller is signal connected with the turbidity sensor and the flow sensor, and is used for controlling a filter screen cleaning mechanism in the water filter to clean the filter screen and synchronously opening a blowdown outlet to blowdown according to a detection signal. The system realizes automatic cleaning and blowdown according to needs based on water quality and flow, does not need to stop, effectively guarantees stable operation of equipment and saves water resources.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and more specifically, to a self-cleaning control system for water filtration in engineering machinery. Background Technology

[0002] Rock drilling rigs rely on external water for slag removal, cooling, and dust suppression during tunnel excavation and mining operations. The cleanliness of the water directly affects the stability of the equipment's operation. Currently, the industry commonly uses manual flushing filters or automatic flushing schemes triggered by a single condition to remove silt and impurities from the water.

[0003] In existing technologies, manual flushing relies on manual periodic opening of the drain solenoid valve to flush the filter screen. However, the harsh operating environment of rock drilling rigs makes it difficult to guarantee the frequency of manual inspections, and filter screen removal and machine shutdown are required when flushing fails, severely impacting operational efficiency. While automatic flushing schemes triggered by a single differential pressure can achieve automatic backwashing, they rely solely on the inlet and outlet pressure difference as the sole criterion, failing to consider the dynamic operating conditions of the rock drilling rig. A surge in flow rate during tunneling can easily trigger false flushing, resulting in water waste. Furthermore, when sticky impurities adhere to the filter screen surface, the pressure difference change is not significant, but the flow rate has already decreased, making a single differential pressure trigger unable to respond promptly. In addition, existing timed or flow-triggered control schemes are not linked to the actual operating status of the rock drilling rig, resulting in rigid control logic and a lack of multi-condition composite judgment mechanisms, leading to poor anti-interference capabilities. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a self-cleaning control system for water filtration in engineering machinery to overcome the problems in the prior art.

[0005] In a first aspect, embodiments of this application provide a self-cleaning control system for water filtration in engineering machinery, comprising: a controller, a water supply pipeline, and a water pipe reel, a turbidity sensor, a flow sensor, a water filter, a safety valve, a heat exchanger, a water pump, a water ball valve, a shut-off valve, and a rock drill arranged sequentially along the water flow direction on the water supply pipeline; the medium flowing in the water supply pipeline is water containing silt; The water pipe reel is connected to an external water source to introduce external water into the system; The turbidity sensor, flow sensor, and water filter are sequentially installed on the water supply pipeline at the rear end of the water pipe reel. The turbidity sensor is used to detect the water quality before entering the water filter in real time, and the flow sensor is used to detect the water flow rate through the water filter in real time. The safety valve, heat exchanger, and water pump are sequentially installed on the water supply pipeline downstream of the water filter. The safety valve is used to limit the water pressure in the pipeline to protect the heat exchanger. The heat exchanger is used to realize the heat exchange between the water and the hydraulic system. The water pump is used to pressurize the water. The water circuit ball valve and the shut-off valve are sequentially installed on the water supply pipeline at the rear end of the water pump. The water circuit ball valve is used to control the opening and closing of the water supply pipeline, and the shut-off valve is used to regulate the flow rate of the water supply pipeline. The rock drill is located at the end of the water supply pipeline behind the shut-off valve and is used to receive water that has been filtered, heat-exchanged and pressurized. The controller is connected to the turbidity sensor and the flow sensor respectively, and is used to control the filter cleaning mechanism in the water filter to clean the filter screen and simultaneously open the drain outlet to discharge sewage based on the detection signals of the turbidity sensor and the flow sensor.

[0006] In some technical solutions of this application, the water filter includes a filter body, a filter screen disposed within the filter body, and a filter screen cleaning mechanism.

[0007] In some technical solutions of this application, the water filter is a Y-type filter. The filter cleaning mechanism includes an electric brush head disposed inside the filter screen and a motor for driving the electric brush head to rotate. The bottom of the Y-type filter is provided with a drain port, and a drain solenoid valve is provided at the drain port. The controller is connected to the motor and the drain solenoid valve respectively.

[0008] In some technical solutions of this application, the water filter further includes an inlet pressure sensor disposed at the inlet of the water filter and an outlet pressure sensor disposed at the outlet of the water filter, both of which are signal connected to the controller.

[0009] In some technical solutions of this application, the controller includes a PLC controller, which has a built-in control program for data acquisition, logic operation and instruction output; the controller has a reserved communication interface for signal connection with the whole vehicle controller of the rock drilling rig, for real-time acquisition of the drilling status, cumulative drilling time and load current parameters of the rock drilling machine.

[0010] In some technical solutions of this application, the controller has a built-in multi-trigger condition composite judgment logic. The multi-trigger conditions include a pressure difference trigger condition based on the pressure sensor at the inlet and outlet, a flow attenuation trigger condition based on the flow sensor, a cumulative working time trigger condition based on the cumulative drilling time, and a water quality turbidity trigger condition based on the turbidity sensor.

[0011] In some technical solutions of this application, the controller adopts a combined triggering strategy of OR logic and priority sorting, wherein the differential pressure triggering condition and the flow attenuation triggering condition are first-level priorities, the water turbidity triggering condition is a second-level priority, and the cumulative working time triggering condition is a third-level priority; when multiple triggering conditions are met simultaneously, the controller executes the flushing action in the order of first-level priority to third-level priority.

[0012] In some technical solutions of this application, the controller dynamically adjusts the flushing threshold, flushing duration and flushing frequency according to the obtained drilling status and load current parameters; when the load current is greater than or equal to 80% of the rated current, the differential pressure threshold is reduced; when in a low-load drilling or shutdown state, the differential pressure threshold is increased and the cumulative working time threshold is extended.

[0013] In some technical solutions of this application, the filter screen is a stainless steel filter screen with a filtration accuracy of 60-100 mesh; the bristles of the electric brush head are made of wear-resistant nylon, and the electric brush head is driven by the motor to achieve 360° rotation; the controller has a preset rinsing time; when the rinsing action is triggered, the controller controls the motor to drive the electric brush head to rotate forward for 3 seconds and reverse for 3 seconds at a speed of 1000 rpm, repeating 2 to 3 times, and simultaneously controls the opening of the drain solenoid valve, so that brushing and draining are carried out simultaneously, and the total rinsing time is the rinsing time.

[0014] In some technical solutions of this application, the turbidity sensor is replaced by a water quality suspended solids concentration sensor; the pressure sensors at the inlet and outlet of the water filter are replaced by differential pressure sensors for directly measuring the pressure difference between the inlet and outlet; and the cumulative working time trigger condition is replaced by a cumulative water flow trigger condition, which triggers flushing when the cumulative water flow reaches a preset threshold.

[0015] The technical solutions provided by the embodiments of this application may include the following beneficial effects: This application provides a water filtration self-cleaning control system for engineering machinery, including: a controller, a water supply pipeline, and a water pipe reel, a turbidity sensor, a flow sensor, a water filter, a safety valve, a heat exchanger, a water pump, a water ball valve, a shut-off valve, and a rock drill, sequentially arranged along the water flow direction on the water supply pipeline; the medium flowing in the water supply pipeline is water containing sediment; the water pipe reel is connected to an external water source for introducing external water into the system; the turbidity sensor, flow sensor, and water filter are sequentially arranged on the water supply pipeline at the rear end of the water pipe reel, the turbidity sensor is used to detect the water quality before entering the water filter in real time, and the flow sensor is used to detect the water flow rate through the water filter in real time; the safety valve, heat exchanger, and water pump are sequentially arranged on the water supply pipeline. On the water supply pipeline downstream of the water filter, the safety valve is used to limit the water pressure in the pipeline to protect the heat exchanger. The heat exchanger is used to realize heat exchange between water and the hydraulic system. The water pump is used to pressurize the water. The water ball valve and the shut-off valve are sequentially arranged on the water supply pipeline downstream of the water pump. The water ball valve is used to control the opening and closing of the water supply pipeline, and the shut-off valve is used to regulate the flow rate of the water supply pipeline. The rock drill is arranged at the end of the water supply pipeline downstream of the shut-off valve and is used to receive the water after filtration, heat exchange and pressurization. The controller is connected to the turbidity sensor and the flow sensor respectively, and is used to control the filter screen cleaning mechanism in the water filter to clean the filter screen and simultaneously open the drain outlet to discharge sewage according to the detection signals of the turbidity sensor and the flow sensor.

[0016] This application transforms the traditional manual inspection or timed flushing mode into an on-demand automatic cleaning mode based on water turbidity and flow rate. The system can automatically trigger the filter cleaning mechanism within the water filter based on real-time detection signals and simultaneously open the drain outlet to discharge wastewater. This completes filter cleaning without requiring machine shutdown, effectively preventing filter clogging caused by untimely manual inspections or delayed timing strategies. This ensures normal cooling of the rock drill and normal heat exchange of the heat exchanger, while also reducing ineffective flushing and significantly saving water resources.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This paper shows an overall layout diagram of a water filtration self-cleaning control system for engineering machinery provided in an embodiment of this application; Figure 2 This is a cross-sectional view of the internal structure of a water filter provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0021] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0023] Rock drilling rigs rely on external water for slag removal, cooling, and dust suppression during tunnel excavation and mining operations. The cleanliness of the water directly affects the stability of the equipment's operation. Currently, the industry commonly uses manual flushing filters or automatic flushing schemes triggered by a single condition to remove silt and impurities from the water.

[0024] In existing technologies, manual flushing relies on manual periodic opening of the drain solenoid valve to flush the filter screen. However, the harsh operating environment of rock drilling rigs makes it difficult to guarantee the frequency of manual inspections, and filter screen removal and machine shutdown are required when flushing fails, severely impacting operational efficiency. While automatic flushing schemes triggered by a single differential pressure can achieve automatic backwashing, they rely solely on the inlet and outlet pressure difference as the sole criterion, failing to consider the dynamic operating conditions of the rock drilling rig. A surge in flow rate during tunneling can easily trigger false flushing, resulting in water waste. Furthermore, when sticky impurities adhere to the filter screen surface, the pressure difference change is not significant, but the flow rate has already decreased, making a single differential pressure trigger unable to respond promptly. In addition, existing timed or flow-triggered control schemes are not linked to the actual operating status of the rock drilling rig, resulting in rigid control logic and a lack of multi-condition composite judgment mechanisms, leading to poor anti-interference capabilities.

[0025] Based on this, this application provides a self-cleaning control system for water filtration in engineering machinery, which is described below through embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] like Figure 1 As shown, this application relates to a water filtration self-cleaning control system for engineering machinery, applicable to operating environments such as rock drilling rigs, tunnel boring equipment, and mining machinery, and particularly suitable for engineering equipment requiring external water sources for drill bit cooling, slag removal, and hydraulic system cooling. The system introduces external water into the equipment via a water supply pipeline, and filters, pressurizes, and transports the water entering the pipeline to ensure that the water quality reaching the rock drill 11 meets operational requirements.

[0027] The medium flowing through the water supply pipeline is water containing silt and sand. In actual engineering operations, external water sources are mostly river water or groundwater, which inevitably contains silt, rock debris, and other solid impurities. If such impurities enter the rock drill 11 directly without treatment, they can easily cause blockage of the drill bit cooling channel, or even lead to overheating and damage to the hydraulic system due to poor heat dissipation. Therefore, the system is equipped with a water pipe reel 1, a turbidity sensor 2, a flow sensor 3, a water filter 4, a safety valve 6, a heat exchanger 7, a water pump 8, a water circuit ball valve 9, a shut-off valve 10, and the rock drill 11 in sequence along the water flow direction to treat and transport the water source in stages.

[0028] The water pipe reel 1 serves as the starting component of the water supply pipeline, connecting to an external water source and introducing external water into the system. In practical applications, since the working position of the rock drilling rig often needs to be moved, the water pipe reel 1 can be wound up and down synchronously with the equipment, providing a flexible and extended water inlet channel for the entire water system, and is the inlet structure that ensures continuous water supply to the system.

[0029] Turbidity sensor 2 is installed on the water supply pipe at the rear end of water pipe reel 1, before water filter 4. Its function is to detect the water quality before it enters water filter 4 in real time, specifically reflecting the concentration of suspended particulate matter in the water. Through this sensor, the system can obtain signals in advance when significant changes occur in water quality, providing data on water quality dimensions for subsequent control decisions. The specific detection principle of this sensor is not limited to a specific type; any sensor capable of measuring the turbidity of a liquid can be used.

[0030] Flow sensor 3 is also installed on the water supply pipe at the rear end of the water pipe reel 1, and works in conjunction with turbidity sensor 2 to detect the water flow rate through water filter 4 in real time. During actual operation, as impurities trapped on the surface of filter screen 42 gradually increase, the resistance to water flow through filter screen 42 will rise, resulting in a decrease in water output. Flow sensor 3 can capture this change in flow rate, providing data on flow rate to determine whether filter screen 42 needs cleaning.

[0031] The water filter 4 is located on the water supply pipeline downstream of the turbidity sensor 2 and the flow sensor 3, and is the core component of the system responsible for physical interception. It contains a filter screen 42 and a filter screen cleaning mechanism. The filter screen 42 is used to trap impurities such as sediment in the water, while the filter screen cleaning mechanism cleans its surface when it becomes clogged. In actual operation, water containing sediment enters the water filter 4 and flows through the filter screen 42. The impurities are trapped on the surface of the filter screen 42, and the filtered water continues to be transported along the pipeline. When the impurities trapped by the filter screen 42 accumulate to a certain extent, the filter screen cleaning mechanism activates to remove the impurities adhering to the surface of the filter screen 42, thereby restoring the filtration capacity of the filter screen 42.

[0032] Safety valve 6 is installed on the water supply pipeline downstream of water filter 4. Its function is to limit the water pressure in the pipeline to protect downstream equipment. Because water pump 8 may generate excessively high water pressure during the pressurization process, if the pressure exceeds the limits that heat exchanger 7 or the pipeline can withstand, it will lead to seal failure or pipeline rupture. Safety valve 6 can automatically open to release pressure when the pressure exceeds the limit, ensuring that the pipeline system operates within a safe pressure range.

[0033] Heat exchanger 7 is installed on the water supply pipeline downstream of safety valve 6. Its function is to realize heat exchange between water and hydraulic system. During the operation of rock drill 11, the hydraulic system generates a lot of heat due to high-pressure operation. Heat exchanger 7 uses water flowing through the pipeline as a cooling medium to carry away the heat of hydraulic oil, preventing the hydraulic system from affecting the seal life and operating accuracy due to excessive temperature.

[0034] Water pump 8 is installed on the water supply pipeline at the rear end of heat exchanger 7 to pressurize the water after heat exchange. Since the pressure of the external water source is limited and cannot meet the water supply pressure and head requirements of the rock drill 11 for normal operation, water pump 8 increases the kinetic energy of the water through mechanical pressurization, enabling it to overcome the resistance of the subsequent pipeline and reach the rock drill 11 smoothly.

[0035] A water supply ball valve 9 and a shut-off valve 10 are sequentially installed on the water supply pipeline downstream of the water pump 8. The water supply ball valve 9 controls the opening and closing of the water supply pipeline. During normal system operation, the ball valve 9 is open. When the equipment needs to be shut down for maintenance or the pipeline needs to be disconnected, the water supply ball valve 9 can be closed to cut off the water flow. The shut-off valve 10 regulates the flow rate of the water supply. By adjusting the opening degree of the shut-off valve 10, the amount of water entering the rock drill 11 can be changed to adapt to the slag removal requirements under different drilling operation conditions.

[0036] The rock drill 11 is located at the end of the water supply pipeline downstream of the shut-off valve 10 and is the terminal equipment of the entire water circuit. After filtration, heat exchange, pressurization and flow regulation, the water finally enters the rock drill 11, which is used to flush away the rock cuttings generated during the drilling process to achieve slag removal, and to cool the drill bit to ensure that the drilling operation can be carried out continuously and effectively.

[0037] At the control level, the system's controller 5 is connected to both the turbidity sensor 2 and the flow sensor 3. Controller 5 is a device capable of signal reception and command output. It processes the detection signals from the turbidity sensor 2 and the flow sensor 3 in real time, and drives the filter cleaning mechanism inside the water filter 42 to clean the filter screen 42. Simultaneously, it opens the drain solenoid valve 44 to discharge wastewater containing impurities from the system. This closed-loop control scheme based on actual water quality and flow signals effectively avoids the inherent defects of inaccurate manual inspections and unreasonable timed flushing in traditional operation methods, achieving intelligent and automated operation of the water filtration system.

[0038] In an optional implementation, the water filter 4 is installed on the water supply pipeline downstream of the turbidity sensor 2 and the flow sensor 3, and is the core component for implementing physical interception in the system. For example... Figure 2As shown, the water filter 4 includes a filter body, within which a filter screen 42 and a filter screen cleaning mechanism are provided. The filter screen 42 is used to trap solid impurities such as silt in the water, while the filter screen cleaning mechanism is used to actively clean the filter screen 42 to restore its filtration capacity. In a specific embodiment, the water filter 4 adopts a Y-type filter. In this embodiment, the filter screen cleaning mechanism specifically includes an electric brush head 43 disposed inside the filter screen 42 and a motor for driving the electric brush head 43 to rotate. The motor is controlled and connected to a controller 5 so that it drives the electric brush head 43 to rotate and brush the surface of the filter screen 42 when a control signal is received. At the same time, the bottom of the Y-type filter is provided with a drain port, and a drain solenoid valve 44 is provided at the drain port. The drain solenoid valve 44 is also controlled and connected to the controller 5 so that it is opened synchronously during the brushing process to discharge the detached impurities and wastewater from the system.

[0039] In addition, in this optional embodiment, the water filter 4 is also equipped with pressure detection elements, specifically including an inlet pressure sensor 41 located at the inlet of the water filter 4 and an outlet pressure sensor 45 located at the outlet of the water filter 4. Both the inlet pressure sensor 41 and the outlet pressure sensor 45 are connected to the controller 5 for signal transmission, and are used to collect water pressure data before and after the water filter 4 in real time, thereby providing the controller 5 with data on the inlet and outlet pressure difference to determine the clogging status of the filter screen 42. The connection and cooperation of the above-mentioned sensors and actuators with the controller 5 constitute the basic hardware support for the system to monitor the working status of the water filter 4 and perform self-cleaning control.

[0040] In an optional embodiment, the filter screen 42 is made of stainless steel with a filtration accuracy of 60 to 100 mesh. This mesh size range ensures sufficient flow capacity while effectively trapping impurities such as mud and sand. The bristles of the electric brush head 43 are made of wear-resistant nylon to extend the service life of the core moving parts. The electric brush head 43 is driven by a motor to achieve 360° rotation, ensuring that there are no dead corners in the cleaning of the filter screen 42 surface during the brushing process. The controller 5 has a preset rinsing time to limit the duration of a single rinsing action. When the controller 5 determines that the rinsing action is triggered based on the sensor signal, the controller 5 sends a control command to the motor to drive the electric brush head 43 to rotate and brush at a speed of 1000 revolutions per minute. The rotation pattern alternates between 3 seconds of clockwise rotation and 3 seconds of counterclockwise rotation, repeating 2 to 3 times to fully remove firmly attached impurities from the surface of the filter screen 42. During the above-mentioned rotational brushing process performed by the electric brush head 43, the controller 5 simultaneously sends an opening command to the drain solenoid valve 44, causing the drain solenoid valve 44 to open synchronously. The impurities removed by the brushing are discharged through the drain outlet along with the water flow. The brushing and draining actions are performed simultaneously. The total duration of the entire rinsing process is determined by the preset rinsing time in the controller 5. After rinsing is completed, the controller 5 closes the electric brush head 43 and the drain solenoid valve 44, and the system returns to normal filtration state.

[0041] In an optional implementation, the controller 5 is a PLC controller, which has a built-in control program for data acquisition, logic operation and instruction output; at the same time, the controller 5 has a reserved communication interface for signal connection with the whole vehicle controller of the rock drilling rig. Through this communication interface, the drilling status, cumulative drilling time and load current parameters of the rock drill 11 can be obtained in real time, so that the system can fully grasp the real-time operating conditions of the rock drill 11.

[0042] Based on the hardware configuration of the controller 5, it has a built-in multi-trigger condition composite judgment logic, which includes four types of trigger conditions: a pressure difference trigger condition based on the pressure difference calculated from the inlet and outlet pressure data collected by the inlet pressure sensor 41 and the outlet pressure sensor 45; a flow decay trigger condition based on the flow decay data collected by the flow sensor 3; a cumulative working time trigger condition based on the cumulative drilling time obtained by the communication interface; and a turbidity trigger condition based on the water quality data collected by the turbidity sensor 2.

[0043] In actual execution, the controller 5 adopts a combined triggering strategy that combines OR logic with priority sorting. The differential pressure triggering condition and the flow attenuation triggering condition are set as first-level priority, the water quality turbidity triggering condition is set as second-level priority, and the cumulative working time triggering condition is set as third-level priority. When the above multiple triggering conditions are met at the same time, the controller 5 executes the flushing action in the order of first-level priority to third-level priority, thereby effectively avoiding false flushing or missed flushing that may occur under single-condition triggering.

[0044] In addition, controller 5 also has an adaptive adjustment function based on operating conditions. It dynamically adjusts the flushing threshold, flushing duration, and flushing frequency according to the real-time drilling status and load current parameters. When the load current is greater than or equal to 80% of the rated current, it indicates that the rock drill 11 is in a high-load drilling state, and controller 5 automatically reduces the differential pressure threshold to ensure the frequency of filter cleaning. When in a low-load drilling state or when the machine is stopped, controller 5 appropriately increases the differential pressure threshold and extends the cumulative working time threshold to reduce unnecessary flushing actions and save water resources while ensuring the filtration effect. Through the combined action of the above-mentioned multi-trigger condition composite judgment, priority sorting, and adaptive operating condition strategy, controller 5 can flexibly adjust control parameters under different operating conditions to achieve precise control of the cleaning process of water filter 4.

[0045] In an optional implementation, the selection of the aforementioned sensing elements and the triggering conditions of the control logic can be adaptively adjusted according to different application scenarios. Specifically, the turbidity sensor 2 can be replaced with a water suspended solids concentration sensor. This sensor reflects the impurity content by detecting the concentration of suspended solids in the water. Its detection principle is different from that of the turbidity sensor, but both can achieve a quantitative assessment of the degree of water pollution and are suitable for working conditions with special requirements for water quality detection accuracy or detection focus. The pressure sensors at the inlet and outlet of the water filter 4 can be replaced with differential pressure sensors. These differential pressure sensors are used to directly measure the pressure difference between the inlet and outlet of the water filter 4, eliminating the need for the controller 5 to read the inlet and outlet pressures separately and then perform difference calculations, thereby simplifying the signal processing logic of the controller 5 and improving the response speed. In addition, the aforementioned cumulative working time triggering condition based on cumulative drilling time can be replaced with a cumulative water flow triggering condition. That is, the controller 5 performs integral calculations based on the flow data collected in real time by the flow sensor 3, and triggers the flushing action when the total cumulative water flow through the water filter 4 reaches a preset threshold. Since the degree of clogging of filter screen 42 is directly correlated with the total amount of sediment passing through, and the cumulative water flow rate can more directly reflect the actual interception load of filter screen 42, under operating conditions where water volume is the core indicator, this replacement scheme can make the flushing triggering timing more closely match the actual filtration consumption, thereby further improving control accuracy and water resource utilization efficiency. The above replacement schemes can be flexibly selected according to actual operating needs and environmental conditions. Each scheme can achieve self-cleaning control of filter screen 42 of water filter 4 while maintaining the basic functions and operating effects of the system.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A self-cleaning control system for water filtration in engineering machinery, characterized in that, include: The system includes a controller, a water supply pipeline, and, sequentially along the water flow direction, a water pipe reel, a turbidity sensor, a flow sensor, a water filter, a safety valve, a heat exchanger, a water pump, a water ball valve, a stop valve, and a rock drill; the medium flowing in the water supply pipeline is water containing silt. The water pipe reel is connected to an external water source to introduce external water into the system; The turbidity sensor, flow sensor, and water filter are sequentially installed on the water supply pipeline at the rear end of the water pipe reel. The turbidity sensor is used to detect the water quality before entering the water filter in real time, and the flow sensor is used to detect the water flow rate through the water filter in real time. The safety valve, heat exchanger, and water pump are sequentially installed on the water supply pipeline downstream of the water filter. The safety valve is used to limit the water pressure in the pipeline to protect the heat exchanger. The heat exchanger is used to realize the heat exchange between the water and the hydraulic system. The water pump is used to pressurize the water. The water circuit ball valve and the shut-off valve are sequentially installed on the water supply pipeline at the rear end of the water pump. The water circuit ball valve is used to control the opening and closing of the water supply pipeline, and the shut-off valve is used to regulate the flow rate of the water supply pipeline. The rock drill is located at the end of the water supply pipeline behind the shut-off valve and is used to receive water that has been filtered, heat-exchanged and pressurized. The controller is connected to the turbidity sensor and the flow sensor respectively, and is used to control the filter cleaning mechanism in the water filter to clean the filter screen and simultaneously open the drain outlet to discharge sewage based on the detection signals of the turbidity sensor and the flow sensor.

2. The system according to claim 1, characterized in that, The water filter includes a filter body, a filter screen disposed within the filter body, and a filter screen cleaning mechanism.

3. The system according to claim 2, characterized in that, The water filter is a Y-type filter. The filter cleaning mechanism includes an electric brush head disposed inside the filter screen and a motor for driving the electric brush head to rotate. The bottom of the Y-type filter is provided with a drain port, and a drain solenoid valve is provided at the drain port. The controller is connected to the motor and the drain solenoid valve respectively.

4. The system according to claim 2, characterized in that, The water filter also includes an inlet pressure sensor located at the inlet of the water filter and an outlet pressure sensor located at the outlet of the water filter, both of which are connected to the controller.

5. The system according to claim 1, characterized in that, The controller includes a PLC controller, which has a built-in control program for data acquisition, logic operation and instruction output; the controller has a reserved communication interface for signal connection with the rock drilling rig's vehicle controller, for real-time acquisition of the rock drilling status, cumulative drilling time and load current parameters.

6. The system according to claim 4, characterized in that, The controller has a built-in multi-trigger condition composite judgment logic. The multi-trigger conditions include a pressure difference trigger condition based on the pressure sensor at the inlet and outlet, a flow rate attenuation trigger condition based on the flow sensor, a cumulative working time trigger condition based on the cumulative drilling time, and a water quality turbidity trigger condition based on the turbidity sensor.

7. The system according to claim 6, characterized in that, The controller employs a combined triggering strategy of OR logic and priority sorting, wherein the differential pressure triggering condition and the flow attenuation triggering condition are first-level priorities, the water turbidity triggering condition is a second-level priority, and the cumulative working time triggering condition is a third-level priority; when multiple triggering conditions are met simultaneously, the controller executes the flushing action in the order of first-level priority to third-level priority.

8. The system according to claim 5, characterized in that, The controller dynamically adjusts the flushing threshold, flushing duration, and flushing frequency based on the obtained drilling status and load current parameters; when the load current is greater than or equal to 80% of the rated current, the differential pressure threshold is reduced; when drilling under low load or in a shutdown state, the differential pressure threshold is increased and the cumulative working time threshold is extended.

9. The system according to claim 3, characterized in that, The filter screen is made of stainless steel with a filtration accuracy of 60-100 mesh; the bristles of the electric brush head are made of wear-resistant nylon, and the electric brush head is driven by the motor to achieve 360° rotation; the controller has a preset rinsing time; when the rinsing action is triggered, the controller controls the motor to drive the electric brush head to rotate forward for 3 seconds and then reverse for 3 seconds at a speed of 1000 rpm, repeating this cycle 2 to 3 times, and simultaneously controls the opening of the drain solenoid valve, so that brushing and draining are carried out simultaneously, and the total rinsing time is the preset rinsing time.

10. The system according to claim 1, characterized in that, The turbidity sensor is replaced with a water suspended solids concentration sensor; the pressure sensors at the inlet and outlet of the water filter are replaced with differential pressure sensors for directly measuring the pressure difference between the inlet and outlet; the cumulative working time trigger condition is replaced with a cumulative water flow trigger condition, which triggers flushing when the cumulative water flow reaches a preset threshold.

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