Non-metallic mud scraper safe operation protection system, mud scraping system and control method

Abstract

The present application relates to non-metallic mud scraper safe operation protection system, mud scraping system and control method, the non-metallic mud scraper safe operation protection system includes scraper detection device, tension warning device and electrical control system;The scraper detection device includes at least one group of scraper detection components, each group of the scraper detection component includes two scraper detection units arranged oppositely, each scraper detection device is connected with the electrical control system, and the scraper detection device is used to contact with the two sides of the scraper;The tension warning device includes two tension warning units arranged oppositely, each tension warning unit is connected with the electrical control system, and the tension warning device is used to contact with the first chain wheel.This system can identify the different step deviation, chain breakage and other failures of the two sides of the scraper in time.

Description

Technical Field

[0001] This invention relates to the field of sludge scrapers, specifically to a safety operation protection system, sludge scraping system, and control method for non-metallic sludge scrapers. Background Technology

[0002] Non-metallic sludge scrapers, also known as non-metallic chain scrapers or non-metallic chain sludge scrapers, are a common type of sludge removal equipment in wastewater treatment systems. Their main operating characteristic is the continuous circulation process used to collect sedimented sludge into a sludge collection pit before discharging it outside the treatment tank. Most of these devices operate underwater 24 hours a day. When malfunctions occur, they are difficult to identify, often requiring the wastewater treatment plant to shut down and clean the tanks for inspection and repair, causing significant challenges to operation and maintenance. Existing non-metallic sludge scrapers suffer from problems such as asynchronous scraper blade deviation and the inability to detect chain breaks, which would lead to even greater losses if the equipment continued to operate. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the first objective of this invention is to provide a safety protection system and a scraping system for non-metallic sludge scrapers. This system can promptly identify faults such as asynchronous deviation of the two sides of the scraper and chain breakage.

[0004] The second objective of this invention is to provide a control method for a sludge scraping system. This control method can terminate the operation of the sludge scraper in a timely manner, avoiding further losses caused by the equipment continuing to operate when the scraper blades run off-center or the chain breaks.

[0005] To achieve the first objective of this invention, the present invention provides a safety operation protection system for a non-metallic sludge scraper, used in a sludge scraping system. The sludge scraping system includes a scraper, a chain connected to both ends of the scraper, and a movable first sprocket for changing the direction of the chain. The safety operation protection system includes a scraper detection device, a tension warning device, and an electrical control system. The scraper detection device includes at least one set of scraper detection components, each set including two oppositely arranged scraper detection units. Each scraper detection unit is connected to the electrical control system, and the scraper detection device is used to contact both ends of the scraper. The tension warning device includes two oppositely arranged tension warning units, each tension warning device connected to the electrical control system, and the tension warning device is used to contact the first sprocket.

[0006] In some embodiments of the present invention, the scraper detection unit includes a fixed base, a rocker arm, and a detection switch; the fixed base includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, the first connecting segment being vertically arranged and including a mounting mechanism, the second connecting segment being bent relative to the first connecting segment, the detection switch being connected to the second connecting segment, the third connecting segment being vertically arranged, and the rocker arm being pivotally disposed on the third connecting segment; the rocker arm is used to contact the scraper, and the detection switch is used to detect the swing of the rocker arm.

[0007] In some embodiments of the present invention, the tension warning unit includes a tension sensor, a tensioning mechanism, a pulley, and a tensioning rope; the tensioning mechanism includes an elastic element, the first end of which is directly or indirectly connected to the tensioning rope, the tensioning rope passing around the pulley and used to connect to the first sprocket, and the tension sensor is disposed on the tensioning mechanism or the tensioning rope.

[0008] In some embodiments of the present invention, the tensioning mechanism further includes a fixed sleeve and a movable sleeve that fit together, the movable sleeve being movable relative to the fixed sleeve, a first end of the elastic element contacting the movable sleeve, a second end of the elastic element contacting the fixed sleeve, and the movable sleeve being connected to the tensioning rope.

[0009] In some embodiments of the present invention, the tension sensor is inserted in the middle of the tension rope and located between the tensioning mechanism and the pulley.

[0010] To achieve the first objective of this invention, the present invention provides a sludge scraping system, including a sedimentation tank and a non-metallic sludge scraper. The sedimentation tank has two side walls located on both sides along its length. The non-metallic sludge scraper includes a scraper, two chains connected to both ends of the scraper, and two movable first sprockets for changing the direction of the two chains. The chains extend along the length of the sedimentation tank and are connected end to end. The system also includes a safety operation protection system for the non-metallic sludge scraper as described in any of the above technical solutions. Two scraper detection units in each set of scraper detection components are respectively arranged opposite to each other on the two side walls. Two tension warning units are respectively connected to the two first sprockets.

[0011] In some embodiments of the present invention, the sedimentation tank includes a boss at the top of the sedimentation tank, the boss having a through hole; the tension warning unit includes a tension sensor and a tension rope, the tension sensor being connected to the tension rope, the end of the tension rope being connected to the first sprocket; both the tension sensor and the tension rope can movably pass through the through hole, the tension sensor being located within the through hole;

[0012] In some embodiments of the present invention, the non-metallic sludge scraper further includes a drive device and a drive wheel, the drive wheel being connected to the chain, and the scraper detection device being disposed close to the drive wheel;

[0013] In some embodiments of the present invention, the non-metallic sludge scraper further includes a drive wheel and a second sprocket for changing the direction of the chain. The chain is driven by the drive wheel to pass sequentially through the first sprocket, the second sprocket, and the drive wheel. In the length direction of the sedimentation tank, the second sprocket is located between the first sprocket and the drive wheel, and the second sprocket is higher than the first sprocket.

[0014] To achieve the second objective of this invention, this invention also provides a control method for the sludge scraping system described in any of the above embodiments, comprising:

[0015] During the operation of the non-metallic sludge scraper, the first signal sent by the scraper detection unit and the second signal sent by the tension warning unit are acquired.

[0016] When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, or the second signal sent by any tension warning unit is less than the second threshold, or the difference between the second signals sent by the two tension warning units is greater than the third threshold, the non-metallic sludge scraper will stop operating.

[0017] In some embodiments of the present invention, a first alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is greater than a first threshold; a second alarm signal is issued when the second signal sent by either tension warning unit is less than a second threshold; and a third alarm signal is issued when the difference between the second signals sent by the two tension warning units is greater than a third threshold.

[0018] In some embodiments of the present invention, a fourth alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is greater than a first threshold, the second signal sent by any tension warning unit is greater than a second threshold, and the difference between the second signals sent by the two tension warning units is less than a third threshold; a fifth alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, and the second signal sent by any tension warning unit is less than the second threshold; a sixth alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the second signal sent by any tension warning unit is greater than the second threshold, and the difference between the second signals sent by the two tension warning units is greater than a third threshold; a seventh alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is less than the first threshold, and the second signal sent by any tension warning unit is less than the second threshold; and an eighth alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is less than the first threshold, the second signal sent by any tension warning unit is greater than the second threshold, and the difference between the second signals sent by the two tension warning units is greater than a third threshold.

[0019] In some embodiments of the present invention, the electrical control system further includes a display and input device for displaying a first signal sent by two scraper detection units and a second signal sent by two tension warning units, and for receiving input signals of a first threshold, a second threshold, and a third threshold.

[0020] In some embodiments of the present invention, the control method further includes: stopping the operation of the non-metallic sludge scraper when the time interval between the first signal sent by the scraper detection device for two adjacent scrapers is greater than a fourth threshold.

[0021] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0022] The non-metallic sludge scraper safety operation protection system and scraping system of this invention utilize a scraper detection device that contacts both sides of the scraper to determine the synchronicity of the contact. Furthermore, a tension warning device connected to the sprocket detects changes in sprocket tension, thereby indicating potential chain breakage or other problems. This invention can promptly detect sludge scraper malfunctions and their types, facilitating scraper maintenance and enabling timely termination of equipment operation to prevent further losses. The system also boasts advantages such as compact structure, easy installation, and comprehensive functionality. The control method of this invention can promptly terminate scraper operation in the event of a malfunction, preventing asynchronous scraper deviation or continued operation when the chain is broken, thus avoiding greater losses. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the main structure of an embodiment of the non-metallic sludge scraper safety operation protection system of the present invention.

[0024] Figure 2 This is a top view schematic diagram of an embodiment of the non-metallic sludge scraper safety operation protection system of the present invention.

[0025] Figure 3 This is a schematic diagram of the scraper detection device in an embodiment of the non-metallic sludge scraper safety operation protection system of the present invention.

[0026] Figure 4 This is a schematic diagram of the tension warning device in an embodiment of the non-metallic sludge scraper safety operation protection system of the present invention.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0028] like Figures 1 to 4 As shown, this embodiment of the invention provides a safety protection system for a non-metallic sludge scraper, applicable to environmental protection fields such as drinking water, domestic sewage, industrial wastewater, and petrochemical wastewater treatment. Installed within rectangular sedimentation tanks such as primary and secondary sedimentation tanks, it is primarily used to collect sludge deposited at the bottom of these tanks. The non-metallic sludge scraper can utilize non-metallic chains or sprockets. During operation, due to chain slippage and breakage, occasional malfunctions such as asynchronous scraper blade deviation, chain breakage, or chain detachment may occur. If these issues are not detected and addressed promptly, continued operation will lead to greater losses. This embodiment incorporates a detection device to identify operational faults, enabling early warning of various potential malfunctions without manual intervention. This prevents unnecessary losses due to continued operation and improves product stability, providing significant safety assurance for equipment operation.

[0029] Specifically, the non-metallic sludge scraper safety operation protection system provided in this embodiment is used in the sludge scraping system. In other words, this embodiment also provides a sludge scraping system with the non-metallic sludge scraper safety operation protection system.

[0030] The sludge scraping system includes a scraper 21, a chain 22 connected to both ends of the scraper 21, and a movable first sprocket 23 for changing the direction of the chain 22. There can be multiple scrapers 21, which are evenly distributed on the chain 22. When the chain 22 moves, it drives the scrapers 21 to move, thereby achieving sludge scraping. The first sprocket 23 can be a driven wheel.

[0031] The safety operation protection system of the non-metallic sludge scraper includes a scraper detection device 30, a tension warning device 40, and an electrical control system 50. The scraper detection device 30 is used to detect whether the two ends of the scraper 21 are synchronized, that is, to detect the fault of the scraper running off-center on both sides. The tension warning device 40 is used to detect the tension of the chain 22 or the first sprocket 23, thereby detecting faults such as chain breakage and chain slippage.

[0032] The scraper detection device 30 includes at least one set of scraper detection components. Each set of scraper detection components includes two scraper detection units arranged opposite to each other. The scraper detection device 30 is used to contact the two ends of the scraper 21. The two scraper detection units 30 in each set of scraper detection components contact the two ends of the scraper 21 respectively. After contact, a signal is generated. The moment the signal is generated is the moment when the scraper detection device 30 contacts the scraper 21.

[0033] The tension warning device 40 includes two tension warning units arranged opposite to each other. Each tension warning unit is used to contact the first sprocket 23. The tension warning unit can detect the tension value of the first sprocket 23 in real time or at a preset time interval.

[0034] Each scraper detection device 30 is connected to the electrical control system 50, and each tension warning unit 40 is connected to the electrical control system. The electrical control system 50 can centrally process the signals sent by the scraper detection device 30 and the tension warning unit 40, process the signals, compare them, and determine whether there is a fault, as well as specific fault types such as asynchronous scraper sides, chain breakage, and chain detachment.

[0035] As can be seen, the main technical solution of this embodiment is as follows: scraper detection devices 30 are installed on both sides of the scraper 21. When the scraper 21 passes the scraper detection device 30, the synchronization of the scrapers 21 on both sides is detected to determine whether the scraper 21 has tilted, derailed, or other faults. A tension warning device 40 is installed on the first sprocket 23. When the tension of the tension sensors 46 on both sides suddenly decreases or the tension deviation on both sides is large, it can be determined that the non-metallic sludge scraper 20 has broken chains or derailed, thereby timely detecting the fault and determining the fault type, providing convenience for subsequent alarm and shutdown. Moreover, the scraper detection device 30, the tension warning device 40, and the electrical control system 50 can be easily added to the existing sludge scraping system, making the application flexible.

[0036] In some examples, the scraper detection unit includes a fixed base 31, a swing arm 32, and a detection switch 33. The fixed base 31 includes a first connecting section 34, a second connecting section 35, and a third connecting section 36 connected in sequence. The first connecting section 34 is vertically arranged and includes a mounting mechanism. The first connecting section 34 can be connected to the side wall of the sedimentation tank 10 by the mounting mechanism, such as screws or bolts. The second connecting section 35 is bent relative to the first connecting section 34. The detection switch 33 is connected to the second connecting section 35. The third connecting section 36 is vertically arranged, and the swing arm 32 is pivotally mounted on the third connecting section 36, so that the swing arm 32 automatically droops under the action of gravity. The swing arm 32 is used to contact the scraper 21, and the detection switch 33 is used to detect the swing of the swing arm 32. The detection switch 33 is located on the second connecting section 35 so that it can be conveniently positioned towards the swing arm 32 for detection.

[0037] In some examples, the tension warning unit 40 includes a tension sensor 46, a tensioning mechanism 41, a pulley 42, and a tension rope 43. The tensioning mechanism 41 includes an elastic element, such as a spring, with its first end directly or indirectly connected to the tension rope 43, allowing the tension rope 43 to move within a certain range. The tension rope 43 passes over the pulley 42 and is used to connect to a first sprocket 23. The pulley 42 is used to change the direction of the tension rope 43, thereby facilitating the installation of the tensioning mechanism 41 above the sedimentation tank 10. The tension sensor 46 is disposed on the tensioning mechanism 41 or the tension rope 43, for example, it can be connected to the elastic element, to the tension rope 43, or between the tensioning mechanism 41 and the tension rope 43. The tension sensor 46 can be an existing tension sensor, for example, it can include a strain gauge to convert the measured pressure or tension into an electrical signal. In other examples, the tension sensor 46 can also be a displacement sensor, determining the magnitude of the pressure or tension by detecting the displacement of the tensioning mechanism 41 or the tension rope 43. Using an elastic element can prevent the tension rope 43 or tension sensor 46 from breaking easily.

[0038] In some examples, the tensioning mechanism 41 also includes a fixed sleeve 44 and a movable sleeve 45 that fit together. The fixed sleeve 44 is used to be installed on the sedimentation tank 10, and the movable sleeve 45 is movable relative to the fixed sleeve 44. The first end of the elastic element contacts the movable sleeve 45, and the second end of the elastic element contacts the fixed sleeve 44. The movable sleeve 45 is connected to the tensioning rope 43, so that the tensioning rope 43 and the elastic element are in indirect contact. The elastic element is located between the two sleeves and is subjected to more uniform force.

[0039] In some examples, the tension sensor 46 is inserted in the middle of the tension rope 43 and located between the tensioning mechanism 41 and the pulley 42. The tension sensor 46 can better detect the tension received by the tension rope 43.

[0040] In some examples, the sludge scraping system includes a sedimentation tank 10 and a non-metallic scraper 20. The sedimentation tank 10 has two sidewalls located on both sides along its length. The non-metallic scraper 20 includes a scraper 21 extending along the width of the sedimentation tank 10, two chains 22 connected to both ends of the scraper 21, and two movable first sprockets 23 for changing the direction of the two chains 22. The first sprockets 23 can move away from the directional wheel 42. When the non-metallic scraper 20 is running, the chains 22 pull the first sprockets 23, thereby enabling the tension warning unit to detect a large tension. Because the scraper 21 has a large dimension extending along the width of the sedimentation tank 10, two chains 22 are needed to pull the two ends of the scraper 21 respectively. The chains 22 extend along the length of the sedimentation tank 10 and are connected end to end, and the chains 22 can move cyclically. The non-metallic sludge scraper safety operation protection system includes two scraper detection units in each scraper detection assembly, which are respectively set opposite to each other on two side walls to detect the synchronicity of the movement of the two ends of the scraper. Two tension warning units 40 are respectively connected to two first sprockets 23 to detect whether the two chains are broken or derailed.

[0041] In some examples, the sedimentation tank 10 includes a boss 11 at the top of the sedimentation tank 10, the boss 11 having a through hole 12, the boss 11 can cover part of the bottom of the sedimentation tank 10, the through hole 12 leads to the bottom of the sedimentation tank 10, and the pulley 42 can be located below the through hole 12. The tension warning unit 40 includes a tension sensor 46 and a tension rope 43, the tension sensor 46 being connected to the tension rope 43, the end of the tension rope 43 being connected to a first sprocket 23, for example, connected to the axis of the first sprocket 23 and allowing the first sprocket 23 to rotate relative to the connection between the first sprocket 23 and the axis. Both the tension sensor 46 and the tension rope 43 can be movably passed through the through hole 12, the tension sensor 46 being located within the through hole 12, thereby protecting the tension sensor 46 and making the tension warning unit easy to install and capable of more accurate detection of tension.

[0042] In some examples, the non-metallic scraper 20 also includes a drive unit 24 and a drive wheel 25, which are connected. The drive wheel 25 is connected to a chain 22, and a scraper detection device 30 is positioned close to the drive wheel 25. The drive wheel 25 can be, for example, a shaft with a sprocket structure, driving both chains 22 simultaneously. The drive unit 24 can be a motor, etc. Because the drive wheel 25 provides tension, the chain 22 is taut when it is close to the drive wheel 25. Positioning the scraper detection device 30 close to the drive wheel 25 allows for more accurate detection of whether the scraper 21 has experienced asynchronous offset at both ends.

[0043] In some examples, the non-metallic scraper 20 also includes a drive wheel 25 and a second sprocket 26 for changing the direction of the chain 22, which is driven by the drive wheel 25, passing sequentially through the first sprocket 23, the second sprocket 26, and the drive wheel 25. Along the length of the sedimentation tank 10, the second sprocket 26 is located between the first sprocket 23 and the drive wheel 25, and is higher than the first sprocket 23; that is, the first sprocket 23 is located at the bottom of the tank, and the second sprocket 26 is located diagonally above it. A pulley 42 is located on the side of the first sprocket 23 away from the drive wheel 25. A tension warning device 40 is installed at the end of the non-metallic scraper 20. This arrangement allows the non-metallic scraper 20 to experience a more uniform and stable tension during operation, enabling the first sprocket 23 to move more effectively away from the pulley 42 under the drive of the chain 22.

[0044] In some examples, this embodiment also provides a method for controlling a sludge scraping system, which includes the following steps:

[0045] Step 1: During the operation of the non-metallic sludge scraper 20, acquire the first signal sent by the scraper detection unit 30 and the second signal sent by the tension warning unit 40. The first signal sent by the scraper detection unit 30 is an electrical signal emitted when the scraper detection unit 30 contacts the scraper 21. The second signal sent by the tension warning unit 40 can be a continuous signal detected in real time or a tension signal detected intermittently; for example, the tension signal can be acquired when the first signal is sent by the scraper detection unit 30.

[0046] Step Two: When the time difference between the first signals sent by the two scraper detection units 30 is greater than the first threshold, or the second signal sent by any tension warning unit 40 is less than the second threshold, or the difference between the second signals sent by the two tension warning units 40 is greater than the third threshold, the non-metallic scraper 20 stops operating. Specifically, a time difference greater than the first threshold indicates that the scraper 21 is deviating or out of sync on both sides. A second signal less than the second threshold indicates that the chain 22 is likely to derail or break. A difference between the second signals sent by the two tension warning units 40 is greater than the third threshold indicates uneven force on the two chains 22, suggesting that the chain 22 is likely to derail, break, or jam. The setting of the first, second, and third thresholds allows for a certain degree of error in the detected or calculated values, improving system stability.

[0047] In some examples, during step two, the sludge scraping system of this embodiment can also issue an alarm signal when a fault is detected. A first alarm signal is issued when the time difference between the first signals sent by the two scraper detection units is greater than a first threshold; a second alarm signal is issued when the second signal sent by either tension warning unit 40 is less than a second threshold; and a third alarm signal is issued when the difference between the second signals sent by the two tension warning units 40 is greater than a third threshold. Issuing different alarm signals under different circumstances allows operators to understand the specific type of fault from the alarm signals. Alarm signals can be, for example, audible, visual, electrical, or display indicators.

[0048] In some examples, in step two, more types of different alarm signals can be issued depending on the different detection signals to determine the type, cause and / or location of the fault, so that operators can choose different maintenance methods.

[0049] For example, when the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the second signal sent by either tension warning unit 40 is greater than the second threshold, and the difference between the second signals sent by the two tension warning units 40 is less than the third threshold, a fourth alarm signal is issued. At this time, it can be inferred that the system has only experienced a fault of asynchronous operation at both ends of the scraper. The operator can repair the scraper 21 and / or chain 22 according to the fourth alarm signal to make the two ends of the scraper synchronized.

[0050] When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, and the second signal sent by either tension warning unit 40 is less than the second threshold, a fifth alarm signal is issued. At this time, it can be inferred that the system has a chain breakage or chain detachment fault, which causes the two ends of the scraper to be out of sync. The operator can repair the chain 22 and other components according to the fifth alarm signal to solve the chain breakage or chain detachment problem.

[0051] When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the second signal sent by either tension warning unit 40 is greater than the second threshold, and the difference between the second signals sent by the two tension warning units 40 is greater than the third threshold, a sixth alarm signal is issued. At this time, it can be inferred that the system has a fault such as chain 22 jamming, which causes the two ends of scraper 21 to be out of sync. The operator can repair the system according to the fifth alarm signal to prevent chain 22 from jamming and repair it to make the two ends of scraper 21 synchronized.

[0052] When the time difference between the first signals sent by the two scraper detection units is less than the first threshold, and the second signal sent by either tension warning unit 40 is less than the second threshold, a seventh alarm signal is issued. At this time, it can be inferred that the chain 22 has broken or derailed, but the two ends of the scraper 21 are not synchronized. The broken chain position may be located on the chain 22 at a position far away from the scraper detection device 30, and the operator can carry out maintenance accordingly.

[0053] When the time difference between the first signals sent by the two scraper detection units is less than the first threshold, the second signal sent by either tension warning unit 40 is greater than the second threshold, and the difference between the second signals sent by the two tension warning units 40 is greater than the third threshold, an eighth alarm signal is issued. At this time, it can be inferred that the chain 22 is jammed, but the two ends of the scraper 21 are not out of sync, and the chain 22 is not broken or detached. The operator can then perform operations such as cleaning up obstacles that are difficult to move in the pool bottom.

[0054] In some examples, the electrical control system 50 also includes a display and input device 51 for displaying a first signal sent by the two scraper detection units 30 and a second signal sent by the two tension warning units 40, such as displaying the time of the first signal and the tension value of the second signal, and for receiving input signals for a first threshold, a second threshold, and a third threshold. The display and input device 51 may include separate displays and buttons, or it may be a touchscreen with display and input functions. The first threshold, the second threshold, and the third threshold can be selected and adjusted according to the actual system environment to determine appropriate shutdown conditions.

[0055] In some embodiments of the present invention, the control method further includes: stopping the operation of the non-metallic sludge scraper when the time interval between the first signals sent by the scraper detection device 30 to two adjacent scrapers 21 is greater than a fourth threshold. The time interval between the first signals sent by the scraper detection device 30 to two adjacent scrapers 21 being greater than the fourth threshold indicates a change in the moving speed of the scraper 21. This may indicate malfunctions such as unstable motor operation or the presence of difficult-to-move obstacles at the bottom of the pool. The type of malfunction can be further determined by considering whether the time difference between the first signals sent by the two scraper detection units 30 is less than the first threshold, whether the second signal sent by any tension warning unit 40 is greater than the second threshold, and whether the difference between the second signals sent by the two tension warning units 40 is less than a third threshold. Corresponding alarm signals can also be issued.

[0056] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A safety protection system for a non-metallic sludge scraper, used in a sludge scraping system, the sludge scraping system comprising a scraper, a chain connected to both ends of the scraper, and a movable first sprocket for changing the direction of the chain, characterized in that... The system includes a scraper detection device, a tension warning device, and an electrical control system. The scraper detection device comprises at least one set of scraper detection components, each set of scraper detection components includes two scraper detection units arranged opposite each other, each scraper detection unit is connected to the electrical control system, and the scraper detection device is used to contact both ends of the scraper. The tension warning device comprises two tension warning units arranged opposite each other, each tension warning unit is connected to the electrical control system, and the tension warning device is used to contact the first sprocket. The scraper detection unit includes a fixed base, a swing arm, and a detection switch; the fixed base includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, the first connecting segment is vertically arranged and includes a mounting mechanism, the second connecting segment is bent relative to the first connecting segment, the detection switch is connected to the second connecting segment, the third connecting segment is vertically arranged, and the swing arm is pivotally mounted on the third connecting segment; the swing arm is used to contact the scraper, and the detection switch is used to detect the swing of the swing arm; The tension warning unit includes a tension sensor, a tensioning mechanism, a pulley, and a tension rope; the tensioning mechanism includes an elastic element, the first end of which is directly or indirectly connected to the tension rope, the tension rope passing around the pulley and used to connect to the first sprocket, and the tension sensor is located on the tensioning mechanism or the tension rope; The tensioning mechanism further includes a fixed sleeve and a movable sleeve that fit together. The movable sleeve is movable relative to the fixed sleeve. The first end of the elastic element contacts the movable sleeve, and the second end of the elastic element contacts the fixed sleeve. The movable sleeve is connected to the tensioning rope. The tension sensor is inserted in the middle of the tension rope and is located between the tensioning mechanism and the pulley.

2. A sludge scraping system, comprising a sedimentation tank and a non-metallic sludge scraper, wherein the sedimentation tank has two sidewalls located on both sides along its length, and the non-metallic sludge scraper includes a scraper, two chains connected to both ends of the scraper, and two movable first sprockets for changing the direction of the two chains, wherein the chains extend along the length of the sedimentation tank and are connected end-to-end; characterized in that It also includes the non-metallic sludge scraper safety operation protection system according to claim 1, wherein the two scraper detection units in each set of scraper detection components are respectively arranged opposite to each other on the two side walls; and the two tension warning units are respectively connected to the two first sprockets; The sedimentation tank includes a boss at the top of the sedimentation tank, and the boss has a through hole; the tension warning unit includes a tension sensor and a tension rope, the tension sensor is connected to the tension rope, and the end of the tension rope is connected to the first sprocket; both the tension sensor and the tension rope can be movably passed through the through hole, and the tension sensor is located inside the through hole; The non-metallic sludge scraper also includes a drive unit and a drive wheel connected to the drive unit. The drive wheel is connected to the chain, and the scraper detection device is located close to the drive wheel. The non-metallic sludge scraper also includes a drive wheel and a second sprocket for changing the direction of the chain. The chain is driven by the drive wheel and passes through the first sprocket, the second sprocket and the drive wheel in sequence. In the length direction of the sedimentation tank, the second sprocket is located between the first sprocket and the drive wheel. The second sprocket is higher than the first sprocket. The pulley is located on the side of the first sprocket away from the drive wheel.

3. The control method for the sludge scraping system according to claim 2, characterized in that... include: During the operation of the non-metallic sludge scraper, the first signal sent by the scraper detection unit and the second signal sent by the tension warning unit are acquired. When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, or the second signal sent by any tension warning unit is less than the second threshold, or the difference between the second signals sent by the two tension warning units is greater than the third threshold, the non-metallic sludge scraper will stop operating.

4. The control method according to claim 3, characterized in that... Also includes: When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the first alarm signal is issued. When the second signal sent by any tension warning unit is less than the second threshold, a second alarm signal is issued; When the difference between the second signals sent by the two tension warning units is greater than the third threshold, a third alarm signal is issued.

5. The control method according to claim 4, characterized in that... Also includes: When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the second signal sent by either tension warning unit is greater than the second threshold, and the difference between the second signals sent by the two tension warning units is less than the third threshold, a fourth alarm signal is issued. When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, and the second signal sent by either tension warning unit is less than the second threshold, a fifth alarm signal is issued. When the time difference between the first signals sent by the two scraper detection units is greater than the first threshold, the second signal sent by either tension warning unit is greater than the second threshold, and the difference between the second signals sent by the two tension warning units is greater than the third threshold, a sixth alarm signal is issued. When the time difference between the first signals sent by the two scraper detection units is less than the first threshold, and the second signal sent by either tension warning unit is less than the second threshold, a seventh alarm signal is issued. When the time difference between the first signals sent by the two scraper detection units is less than the first threshold, the second signal sent by either tension warning unit is greater than the second threshold, and the difference between the second signals sent by the two tension warning units is greater than the third threshold, an eighth alarm signal is issued.

6. The control method according to any one of claims 3 to 5, characterized in that: The electrical control system also includes a display and input device, which is used to display a first signal sent by two scraper detection units and a second signal sent by two tension warning units, and to receive input signals of a first threshold, a second threshold and a third threshold; The control method further includes: stopping the operation of the non-metallic sludge scraper when the time interval between the first signal sent by the scraper detection device for two adjacent scrapers is greater than a fourth threshold.

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