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

Abstract

The invention relates to a safe operation protection system for a non-metal mud scraper, a mud scraping system and a control method. The safe operation protection system for the non-metal mud scraper comprises a scraper detection device, a tension early warning device and an electrical control system, the scraper blade detection device comprises at least one group of scraper blade detection devices, each group of scraper blade detection devices comprises two scraper blade detection devices which are oppositely arranged, each scraper blade detection device is connected with the electrical control system, and the scraper blade detection devices are used for being in contact with the two side ends of a scraper blade; the tensioning force early warning device comprises two opposite tensioning force early warning devices, each tensioning force early warning device is connected with the electric appliance control system, and the tensioning force early warning devices are used for making contact with the first chain wheel. The system can timely identify the faults such as asynchronous deviation and chain breakage of the two sides of the scraper.

Description

Technical Field

[0001] The invention relates to the field of mud scrapers, and in particular to a safe operation protection system for a non-metallic mud scraper, a mud scraper system and a control method. Background Art

[0002] Non-metal scraper, also known as non-metal chain scraper or non-metal chain scraper, is a common sludge removal equipment in sewage treatment systems. Its main working feature is to collect the deposited sludge into the sludge collection pit through continuous circulation and then discharge it out of the pool. Most of the equipment operates underwater 24 hours a day. When the equipment fails, it is difficult to identify. Usually, the sewage plant needs to stop water and clean the pool for inspection and maintenance, which brings great trouble to the operation and maintenance of the equipment. The existing non-metal scraper has problems such as asynchronous deviation of the two sides of the scraper and inability to detect after the chain is broken during operation. Continuing to operate the equipment will cause greater losses. Summary of the invention

[0003] In view of the deficiencies in the prior art, the first object of the present invention is to provide a non-metallic scraper safe operation protection system and a scraper system, which can promptly identify faults such as asynchronous deviation and chain breakage on both sides of the scraper.

[0004] The second object of the present invention is to provide a control method for a scraper system, which can terminate the operation of the scraper in time to avoid asynchronous deviation of the two sides of the scraper and greater losses caused by continued operation of the equipment when the chain is broken.

[0005] To achieve the first purpose of the present invention, the present invention provides a non-metallic scraper safe operation protection system for a scraper system, the scraper system comprising a scraper, a chain connected at both ends of the scraper, and a movable first sprocket for changing the direction of the chain, the non-metallic scraper safe operation protection system comprising a scraper detection device, a tensioning force warning device and an electrical control system; the scraper detection device comprises at least one group of scraper detection devices, each group of the scraper detection devices comprises two scraper detection devices arranged opposite to each other, each of the scraper detection devices is connected to the electrical control system, and the scraper detection device is used to contact the two side ends of the scraper; the tensioning force warning device comprises two tensioning force warning devices arranged opposite to each other, each of the tensioning force warning devices is connected to the electrical control system, and the tensioning force warning device is used to contact the first sprocket.

[0006] In some embodiments of the present invention, the scraper detection device includes a fixed seat, a rocker arm and a detection switch; the fixed seat includes a first connecting section, a second connecting section and a third connecting section connected in sequence, the first connecting section is vertically arranged and includes a mounting mechanism, the second connecting section is bent relative to the first connecting section, the detection switch is connected to the second connecting section, the third connecting section is vertically arranged, and the rocker arm can be pivotally arranged on the third connecting section; 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 force warning device includes a tension force sensor, a tensioning mechanism, a pulley and a tensioning rope; the tensioning mechanism includes an elastic member, the first end of the elastic member is directly or indirectly connected to the tensioning rope, the tensioning rope passes around the pulley and is used to connect to the first sprocket, and the tension force sensor is arranged 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 which are mutually nested, the movable sleeve can move relative to the fixed sleeve, the first end of the elastic member contacts the movable sleeve, the second end of the elastic member contacts the fixed sleeve, and the movable sleeve is connected to the tensioning rope.

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

[0010] To achieve the first purpose of the present invention, the present invention provides a scraper system, including a sedimentation tank and a non-metallic scraper, the sedimentation tank having two side walls located on both sides of the length direction of the sedimentation tank, the non-metallic scraper including a scraper, two chains connected at both ends of the scraper, and two movable first sprockets respectively used to change the direction of the two chains, the chains extending along the length direction of the sedimentation tank and connected end to end; it also includes the non-metallic scraper safe operation protection system described in any of the above technical solutions, the two scraper detection devices in each group of the scraper detection devices are respectively arranged opposite to each other on the two side walls; the two tensioning force warning devices are respectively connected to the two first sprockets.

[0011] In some embodiments of the present invention, the sedimentation tank includes a boss disposed at the top of the sedimentation tank, and the boss is provided with a through hole; the tension warning device 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; the tension sensor and the tension rope can both movably pass through the through hole, and the tension sensor is located in the through hole;

[0012] In some embodiments of the present invention, the non-metallic mud scraper further comprises a driving device and a driving wheel, the driving wheel is connected to the chain, and the scraper detection device is arranged close to the driving wheel;

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

[0014] To achieve the second objective of the present invention, the present invention further provides a control method for the scraping system according to any of the above schemes, which comprises:

[0015] When the non-metallic scraper is running, a first signal sent by the scraper detection device and a second signal sent by the tensioning force warning device are obtained;

[0016] When the time difference of the first signals sent by the two scraper detection devices is greater than the first threshold, or the second signal sent by any tensioning force warning device is less than the second threshold, or the difference between the second signals sent by the two tensioning force warning devices is greater than the third threshold, the non-metallic scraper is stopped.

[0017] In some embodiments of the present invention, when the time difference between the first signals sent by the two scraper detection devices is greater than the first threshold, a first alarm signal is issued; when the second signal sent by any tensioning force warning device is less than the second threshold, a second alarm signal is issued; when the difference between the second signals sent by the two tensioning force warning devices is greater than the third threshold, a third alarm signal is issued.

[0018] In some embodiments of the present invention, when the time difference between the first signals sent by the two scraper detection devices is greater than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 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 devices is greater than the first threshold, and the second signal sent by any tensioning force warning device 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 devices is greater than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 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 devices is less than the first threshold, and the second signal sent by any tensioning force warning device 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 devices is less than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices is greater than the third threshold, an eighth alarm signal is issued.

[0019] In some embodiments of the present invention, the electrical control system also includes a display and input device, which is used to display the first signal sent by the two scraper detection devices and the second signal sent by the two tensioning force warning devices, and to receive input signals of the first threshold, the second threshold and the third threshold.

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

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

[0022] The non-metal scraper safe operation protection system and scraper system of the present invention utilizes the scraper detection device to contact the two side ends of the scraper of the scraper, so as to know the synchronization of the scraper detection device used to contact the two side ends of the scraper, and utilizes the tensioning force warning device to connect with the sprocket, so as to know the change of the sprocket tension and thus know whether the chain is broken. The present invention can timely detect the failure of the scraper and the type of failure, which is convenient for the maintenance of the scraper, and helps to terminate the operation of the equipment in time to avoid causing greater losses. The system of the present invention also has the advantages of compact structure, easy installation, and complete functions. The control method of the present invention can terminate the operation of the scraper in time when a failure occurs, and avoid the asynchronous deviation of the two sides of the scraper and the continued operation of the equipment when the chain is broken, resulting in greater losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a main structural diagram of an embodiment of a non-metallic scraper safe operation protection system of the present invention.

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

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

[0026] Figure 4 It is a structural schematic diagram of a tension force warning device in an embodiment of a non-metallic scraper safe operation protection system of the present invention.

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation modes. DETAILED DESCRIPTION

[0028] like Figures 1 to 4 As shown, the embodiment of the present invention provides a non-metal scraper safe operation protection system, which can be applied to environmental protection fields such as drinking water, domestic sewage and industrial sewage, petrochemical and chemical sewage treatment, etc., and is installed in the non-metal scraper system of rectangular sedimentation tanks such as primary sedimentation tanks and secondary sedimentation tanks. It is mainly used for collecting the non-metal scraper for collecting the sediment sludge at the bottom of the tank in various types of wastewater treatment primary sedimentation tanks, secondary sedimentation tanks and other rectangular sedimentation tanks. The non-metal scraper can use non-metal chains or non-metal sprockets. During the operation of the non-metal scraper, due to the slippage and breakage of the chain, the scraper will occasionally have asynchronous deviation, chain breakage, chain derailment and other faults on both sides. If it is not detected and stopped in time, the continued operation of the equipment will cause greater losses. This embodiment adds a detection device to judge the equipment operation failure, which can identify various possible failures of the non-metal scraper in advance without manual intervention, so as to achieve early warning and avoid unnecessary losses caused by continued operation due to equipment failure, thereby improving the stability of the product and providing great safety protection for the operation of the equipment.

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

[0030] The 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. The number of scrapers 21 can be multiple, and the multiple scrapers 21 are evenly distributed on the chain 22. When the chain 22 moves, the chain 22 drives the scraper 21 to move so as to scrape the mud. The first sprocket 23 can be a driven wheel.

[0031] The non-metallic scraper safe operation protection system includes a scraper detection device 30, a tensioning force warning device 40 and an electrical control system 50, wherein the scraper detection device 30 is used to detect whether the two side ends of the scraper 21 are synchronized, that is, to detect the failure of the two sides of the scraper to deviate from the synchronization, and the tensioning force warning device 40 is used to detect the tensioning force of the chain 22 or the first sprocket 23, so as to detect failures such as chain breakage and chain derailment.

[0032] Among them, the scraper detection device 30 includes at least one group of scraper detection devices 30, each group of scraper detection devices 30 includes two scraper detection devices 30 arranged opposite to each other, and the scraper detection device 30 is used to contact with the two side ends of the scraper 21. The two scraper detection devices 30 in each group of scraper detection devices 30 respectively contact with the two side ends of the scraper 21, and generate a signal after the contact. The moment when 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 devices 40 arranged opposite to each other. Each tension warning device 40 is used to contact the first sprocket 23. The tension warning device 40 can detect the tension value of the first sprocket 23 in real time or at preset time intervals.

[0034] Each scraper detection device 30 is connected to the electrical control system 50, and each tensioning force warning device 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 tensioning force warning device 40, process and compare the signals, and judge whether there is a fault and the specific fault types such as the two sides of the scraper are out of sync, chain breakage, chain decoupling, etc.

[0035] It can be seen that the technical solution of this embodiment is mainly: installing a scraper detection device 30 on both sides of the scraper 21. When the scraper 21 passes through the scraper detection device 30, the synchronization of the scrapers 21 on both sides is detected to determine whether the scraper 21 has faults such as tilting or derailing; installing a tension warning device 40 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 scraper 20 has faults such as chain breakage or derailment, so as to detect the fault in time and determine the fault type, which provides 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 installed in the existing scraper system, and the application is flexible.

[0036] In some examples, the scraper detection device 30 includes a fixed seat 31, a swing arm 32 and a detection switch 33; the fixed seat 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 a 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 arranged at 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, the detection switch 33 is used to detect the swing of the swing arm 32, and the detection switch 33 is arranged at the second connecting section 35 so that it can be conveniently detected toward the swing arm 32.

[0037] In some examples, the tension warning device 40 includes a tension sensor 46, a tension mechanism 41, a pulley 42 and a tension rope 43. The tension mechanism 41 includes an elastic member such as a spring, the first end of the elastic member is directly or indirectly connected to the tension rope 43, and the elastic member allows the tension rope 43 to move within a certain range. The tension rope 43 bypasses the pulley 42 and is used to connect the first sprocket 23, and the pulley 42 is used to change the direction of the tension rope 43, so as to facilitate the installation of the tension mechanism 41 and the like above the sedimentation tank 10. The tension sensor 46 is provided on the tension mechanism 41 or the tension rope 43, for example, it can be connected to the elastic member, connected to the tension rope 43, and connected between the tension 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, which determines the magnitude of the pressure or tension by detecting the displacement of the tension mechanism 41 or the tension rope 43. The use of an elastic member can prevent the tension rope 43 or the tension force sensor 46 from being easily broken.

[0038] In some examples, the tensioning mechanism 41 also includes a fixed sleeve 44 and a movable sleeve 45 that are nested with each other. The fixed sleeve 44 is used to be installed on the sedimentation tank 10. The movable sleeve 45 can move relative to the fixed sleeve 44. The first end of the elastic member contacts the movable sleeve 45, and the second end of the elastic member 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 member are in indirect contact. The elastic member is arranged between the two sleeves to be more evenly stressed.

[0039] In some examples, the tension sensor 46 is inserted in the middle of the tension rope 43 and is 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 scraper system includes a sedimentation tank 10 and a non-metallic scraper 20, wherein the sedimentation tank 10 has two side walls located on both sides of the length direction of the sedimentation tank 10, and the non-metallic scraper 20 includes a scraper 21 extending in the width direction of the sedimentation tank 10, two chains 22 connected to the two ends of the scraper 21, and two movable first sprockets 23 respectively used to change the direction of the two chains 22, wherein the first sprocket 23 can move in a direction away from the directional wheel 42, and when the non-metallic scraper 20 is running, the chain 22 pulls the first sprocket 23 to move, so that the tension warning device 40 can detect a larger tension. Since the scraper 21 has a larger dimension extending in the width direction of the sedimentation tank 10, two chains 22 are required to pull the two ends of the scraper 21 to move respectively. The chain 22 extends in the length direction of the sedimentation tank 10 and is connected end to end, and the chain 22 can move cyclically. The non-metal scraper safe operation protection system, the two scraper detection devices 30 in each set of scraper detection devices 30 are respectively arranged on the two side walls to detect the synchronization of the movement of the two side ends of the scraper. The two tensioning force warning devices 40 are respectively connected to the two first sprockets 23 to detect whether the two chains are broken or decoupled.

[0041] In some examples, the sedimentation tank 10 includes a boss 11 disposed at the top of the sedimentation tank 10, the boss 11 is provided with a through hole 12, the boss 11 can be blocked above a portion 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 device 40 includes a tension sensor 46 and a tension rope 43, the tension sensor 46 is connected to the tension rope 43, and the end of the tension rope 43 is connected to the 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. The tension sensor 46 and the tension rope 43 can both movably pass through the through hole 12, and the tension sensor 46 is located in the through hole 12, thereby protecting the tension sensor 46 and making the tension warning device 40 easy to install and capable of more accurately detecting the tension.

[0042] In some examples, the non-metallic scraper 20 further includes a driving device 24 and a driving wheel 25, the driving device 24 and the driving wheel 25 are connected, the driving wheel 25 is connected to the chain 22, and the scraper detection device 30 is arranged near the driving wheel 25. The driving wheel 25 can be, for example, a rotating shaft with a sprocket structure, which drives two chains 22 at the same time. The driving device 24 can be a motor, etc. Since the driving wheel 25 can provide a pulling force, the chain 22 will be in a tensioned state when it is close to the driving wheel 25. The scraper detection device 30 is arranged near the driving wheel 25 to more accurately reflect whether the scraper 21 has asynchronous offset at both ends.

[0043] In some examples, the non-metal scraper 20 further includes a driving wheel 25 and a second sprocket 26 for changing the direction of the chain 22, and the chain 22 is driven by the driving wheel 25 to pass through the first sprocket 23, the second sprocket 26 and the driving wheel 25 in sequence. In the length direction of the sedimentation tank 10, the second sprocket 26 is located between the first sprocket 23 and the driving wheel 25, and the second sprocket 26 is higher than the first sprocket 23, that is, the first sprocket 23 is a sprocket located at the bottom of the tank, and the second sprocket 26 is located obliquely above the first sprocket 23. The pulley 42 is located on the side of the first sprocket 23 away from the driving wheel 25. The tension warning device 40 is installed at the end of the non-metal scraper 20. In this way, the non-metal scraper 20 is subjected to a more uniform and stable tension during operation, and the first sprocket 23 can be better driven by the chain 22 to move away from the pulley 42.

[0044] In some examples, the present embodiment further provides a control method for a mud scraping system, which includes the following steps:

[0045] Step 1: When the non-metallic scraper 20 is running, a first signal sent by the scraper detection device 30 and a second signal sent by the tension warning device 40 are obtained. The first signal sent by the scraper detection device 30 is an electrical signal sent when the scraper detection device 30 contacts the scraper 21, and the second signal sent by the tension warning device 40 can be a continuous signal detected in real time or a tension signal detected intermittently. For example, the tension signal can be obtained when the scraper detection device 30 sends the first signal.

[0046] Step 2: When the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, or the second signal sent by any tension warning device 40 is less than the second threshold value, or the difference of the second signals sent by the two tension warning devices 40 is greater than the third threshold value, the non-metallic scraper 20 is stopped. Among them, the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, indicating that the two ends of the scraper 21 are offset and asynchronous in operation. The second signal sent by any tension warning device 40 is less than the second threshold value, indicating that the chain 22 is likely to be decoupled or broken. The difference of the second signals sent by the two tension warning devices 40 is greater than the third threshold value, indicating that the two chains 22 are unevenly stressed, indicating that the chain 22 is likely to be decoupled, broken, or stuck. The setting of the first threshold value, the second threshold value, and the third threshold value allows the detected or calculated values ​​to have a certain error, thereby improving the stability of the system.

[0047] In some examples, in step 2, the scraper system of this embodiment can also send out an alarm signal when a fault is detected. When the time difference between the first signals sent by the two scraper detection devices 30 is greater than the first threshold, a first alarm signal is sent out; when the second signal sent by any tensioning force warning device 40 is less than the second threshold, a second alarm signal is sent out; when the difference between the second signals sent by the two tensioning force warning devices 40 is greater than the third threshold, a third alarm signal is sent out. Sending out different alarm signals in different situations makes it easier for operators to understand the specific type of fault from the alarm signal. The alarm signal can be, for example, sound, light, electricity, display mark, etc.

[0048] In some examples, in step 2, more types of different alarm signals may be issued according to different conditions of the detection signal to determine the type, cause and / or location of the fault, so as to facilitate the operator to select different maintenance methods.

[0049] For example, when the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold, the second signal sent by any tensioning force warning device 40 is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 40 is less than the third threshold, a fourth alarm signal is issued. At this time, it can be inferred that the system only has a failure of the two ends of the scraper being out of sync. The operator can repair the scraper 21 and / or chain 22 according to the fourth alarm signal to synchronize the two ends of the scraper.

[0050] When the time difference between the first signals sent by the two scraper detection devices 30 is greater than the first threshold, and the second signal sent by any tensioning force warning device 40 is less than the second threshold, the fifth alarm signal is issued. At this time, it can be inferred that a chain breakage or chain detachment failure has occurred in the system and the failure has caused the two ends of the scraper to be out of sync. The operator can repair the chain 22 etc. according to the fifth alarm signal to solve the chain breakage or chain detachment problem.

[0051] When the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold, the second signal sent by any tensioning force warning device 40 is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 40 is greater than the third threshold, the sixth alarm signal is issued. At this time, it can be inferred that the system has a fault such as the chain 22 being stuck, which causes the two ends of the scraper 21 to be out of sync. The operator can repair the system according to the fifth alarm signal to avoid the chain 22 from getting stuck and repair it to make the two ends of the scraper 21 synchronized.

[0052] When the time difference between the first signals sent by the two scraper detection devices 30 is less than the first threshold, and the second signal sent by any tensioning force warning device 40 is less than the second threshold, the seventh alarm signal is issued. At this time, it can be inferred that the chain 22 is broken or detached, but the two ends of the scraper 21 are not out of sync. The broken chain position may be located at a position of the chain 22 away from the scraper detection device 30, and the operator can perform corresponding maintenance.

[0053] When the time difference of the first signals sent by the two scraper detection devices 30 is less than the first threshold, the second signal sent by any tensioning force warning device 40 is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 40 is greater than the third threshold, the eighth alarm signal is issued. At this time, it can be inferred that the chain 22 is stuck, 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 perform operations such as cleaning the difficult-to-move obstacles on the local bottom of the pool.

[0054] In some examples, the electrical control system 50 further includes a display and input device 51, which is used to display the first signal sent by the two scraper detection devices 30 and the second signal sent by the two tension warning devices 40, such as displaying the time of the first signal and the tension value of the second signal, and is used to receive input signals of the first threshold, the second threshold, and the third threshold. The display and input device 51 may include a separate display screen and buttons, or may be a touch screen with display and input functions. The first threshold, the second threshold, and the third threshold may be selected and adjusted according to the actual system environment to determine the appropriate shutdown condition.

[0055] In some embodiments of the present invention, the control method further includes: when the time interval of the first signal sent by the scraper detection device 30 when two adjacent scrapers 21 pass through is greater than the fourth threshold, the non-metallic scraper is stopped. If the time interval of the first signal sent by the scraper detection device 30 when two adjacent scrapers 21 pass through is greater than the fourth threshold, it indicates that the moving speed of the scraper 21 has changed. At this time, the motor may be unstable, or there may be obstacles on the bottom of the pool that are difficult to move. The fault type can be further determined by combining whether the time difference of the first signals sent by the two scraper detection devices 30 is less than the first threshold, whether the second signal sent by any tensioning force warning device 40 is greater than the second threshold, and whether the difference of the second signals sent by the two tensioning force warning devices 40 is less than the third threshold, and a corresponding alarm signal can also be issued.

[0056] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-metal scraper safe operation protection system for a scraper system, the scraper 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 It includes a scraper detection device, a tensioning force warning device and an electrical control system; the scraper detection device includes at least one group of scraper detection devices, each group of scraper detection devices includes two scraper detection devices arranged opposite to each other, each of the scraper detection devices is connected to the electrical control system, and the scraper detection devices are used to contact the two side ends of the scraper; the tensioning force warning device includes two tensioning force warning devices arranged opposite to each other, each of the tensioning force warning devices is connected to the electrical control system, and the tensioning force warning device is used to contact the first sprocket.

2. The non-metallic scraper safe operation protection system according to claim 1 is characterized in that The scraper detection device includes a fixed seat, a rocker arm and a detection switch; the fixed seat includes a first connecting section, a second connecting section and a third connecting section connected in sequence, the first connecting section is vertically arranged and includes a mounting mechanism, the second connecting section is bent relative to the first connecting section, the detection switch is connected to the second connecting section, the third connecting section is vertically arranged, and the rocker arm can be pivotally arranged on the third connecting section; the rocker arm is used to contact the scraper, and the detection switch is used to detect the swing of the rocker arm.

3. The non-metallic scraper safe operation protection system according to claim 1 or 2, characterized in that The tension force warning device includes a tension force sensor, a tensioning mechanism, a pulley and a tensioning rope; the tensioning mechanism includes an elastic member, the first end of the elastic member is directly or indirectly connected to the tensioning rope, the tensioning rope passes around the pulley and is used to connect to the first sprocket, and the tension force sensor is arranged on the tensioning mechanism or the tensioning rope.

4. The non-metallic scraper safe operation protection system according to claim 3 is characterized in that The tensioning mechanism further comprises a fixed sleeve and a movable sleeve which are mutually nested, the movable sleeve can move relative to the fixed sleeve, the first end of the elastic member contacts the movable sleeve, the second end of the elastic member contacts the fixed sleeve, and the movable sleeve is connected to the tensioning rope; And / or, the tensioning force sensor is inserted in the middle of the tensioning rope and located between the tensioning mechanism and the pulley.

5. A scraping system, comprising a sedimentation tank and a non-metallic scraper, wherein the sedimentation tank has two side walls located on both sides of the length direction of the sedimentation tank, and the non-metallic scraper comprises a scraper, two chains connected to the two ends of the scraper, and two movable first sprockets respectively used to change the direction of the two chains, wherein the chains extend along the length direction of the sedimentation tank and are connected end to end; characterized in that It also includes a non-metallic scraper safe operation protection system according to any one of claims 1 to 4, wherein the two scraper detection devices in each group of the scraper detection devices are respectively arranged opposite to each other on the two side walls; and the two tensioning force warning devices are respectively connected to the two first sprockets.

6. The sludge scraping system according to claim 5, characterized in that The sedimentation tank comprises a boss disposed at the top of the sedimentation tank, and the boss is provided with a through hole; the tension warning device comprises 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; the tension sensor and the tension rope can both movably pass through the through hole, and the tension sensor is located in the through hole; And / or, the non-metallic scraper further comprises a driving device and a driving wheel connected to the driving device, the driving wheel is connected to the chain, and the scraper detection device is arranged close to the driving wheel; And / or, the non-metallic scraper also includes a driving wheel and a second sprocket for changing the direction of the chain, the chain is driven by the driving wheel to pass through the first sprocket, the second sprocket and the driving wheel in sequence; in the length direction of the sedimentation tank, the second sprocket is located between the first sprocket and the driving wheel, the second sprocket is higher than the first sprocket, and the pulley is arranged on the side of the first sprocket away from the driving wheel.

7. The control method of the sludge scraping system according to any one of claims 5 or 6, characterized in that include: When the non-metallic scraper is running, a first signal sent by the scraper detection device and a second signal sent by the tensioning force warning device are obtained; When the time difference of the first signals sent by the two scraper detection devices is greater than the first threshold, or the second signal sent by any tensioning force warning device is less than the second threshold, or the difference between the second signals sent by the two tensioning force warning devices is greater than the third threshold, the non-metallic scraper is stopped.

8. The control method according to claim 7, characterized in that Also includes: When the time difference between the first signals sent by the two scraper detection devices is greater than a first threshold, a first alarm signal is issued; When the second signal sent by any tensioning force warning device is less than the second threshold value, a second alarm signal is sent; When the difference between the second signals sent by the two tensioning force warning devices is greater than a third threshold, a third alarm signal is sent out.

9. The control method according to claim 7, characterized in that Also includes: When the time difference between the first signals sent by the two scraper detection devices is greater than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 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 devices is greater than the first threshold, and the second signal sent by any tensioning force early warning device 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 devices is greater than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices 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 devices is less than the first threshold, and the second signal sent by any tensioning force early warning device is less than the second threshold, a seventh alarm signal is issued; When the time difference of the first signals sent by the two scraper detection devices is less than the first threshold, the second signal sent by any tensioning force warning device is greater than the second threshold, and the difference between the second signals sent by the two tensioning force warning devices is greater than the third threshold, the eighth alarm signal is issued.

10. The control method according to any one of claims 7 to 9, characterized in that: The electrical control system further comprises a display and input device, the display and input device being used to display a first signal sent by the two scraper detection devices and a second signal sent by the two tensioning force warning devices, and being used to receive input signals of a first threshold, a second threshold and a third threshold; The control method further comprises: when the time interval between two adjacent scrapers passing through the first signal sent by the scraper detection device is greater than a fourth threshold value, stopping the non-metallic scraper from running.

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