Non-metal mud scraper safe operation protection system and mud scraping system

Abstract

The utility model relates to a safe operation protection system of a non-metal mud scraper and a mud scraping system. The safe operation protection system of 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 utility model relates to the field of mud scraper, concretely relates to nonmetallic mud scraper safe operation protection system and mud scraping system. BACKGROUND

[0002] Nonmetallic mud scraper, also called nonmetallic chain plate mud scraper and nonmetallic chain mud scraper, is a kind of common mud discharging equipment in sewage treatment system, and its main working feature is that deposited sludge is collected to mud collecting pit and then discharged outside pool by continuous circulation operation, most of the equipment is underwater 24 hours operation, when the equipment fails, it is difficult to identify, and usually sewage plant needs to stop water to clean pool to check and maintain, which brings great trouble to equipment operation and maintenance. SUMMARY

[0003] In view of the defects of prior art, the utility model aims at providing nonmetallic mud scraper safe operation protection system and mud scraping system, which can identify the faults such as the different step of two sides of scraper and chain breakage in time.

[0004] To realize the utility model's purpose, the utility model provides nonmetallic mud scraper safe operation protection system for mud scraping system, the mud scraping system includes scraper, chain connected at both ends of the scraper and movable first sprocket for changing the direction of the chain, and the nonmetallic mud scraper safe operation protection system includes scraper detection device, tension force early warning device and electrical control system;The scraper detection device includes at least one group of scraper detection devices, each group of scraper detection devices includes two oppositely arranged scraper detection devices, each scraper detection device is connected with the electrical control system, and the scraper detection device is used for contacting with the two sides of the scraper;The tension force early warning device includes two oppositely arranged tension force early warning devices, each tension force early warning device is connected with the electrical control system, and the tension force early warning device is used for contacting with the first sprocket.

[0005] In some embodiments of the utility model, the scraper detection device includes fixed seat, swing lever and detection switch;The fixed seat includes first connecting section, second connecting section and third connecting section connected in sequence, the first connecting section is vertically arranged and includes 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 swing lever is pivotably arranged on the third connecting section;The swing lever is used for contacting with the scraper, and the detection switch is used for detecting the swing of the swing lever.

[0006] In some embodiments of the utility model, the tensioning force early warning device comprises a tensioning force sensor, a tensioning mechanism, a pulley and a tensioning rope, the tensioning mechanism comprises an elastic piece, the elastic piece first end is directly or indirectly connected with the tensioning rope, the tensioning rope passes through the pulley and is used for connecting the first chain wheel, the tensioning force sensor is arranged in the tensioning mechanism or the tensioning rope.

[0007] In some embodiments of the utility model, the tensioning mechanism further comprises a fixed sleeve and a movable sleeve which are sleeved with each other, the movable sleeve can move relative to the fixed sleeve, the elastic piece first end contacts with the movable sleeve, the elastic piece second end contacts with the fixed sleeve, and the movable sleeve is connected with the tensioning rope.

[0008] In some embodiments of the utility model, the tensioning force sensor is inserted in the middle of the tensioning rope and located between the tensioning mechanism and the pulley.

[0009] In order to realize the purpose of the utility model, the utility model provides a mud scraping system, including a sedimentation tank and a nonmetallic mud scraper, the sedimentation tank has two side walls on both sides of the length direction of the sedimentation tank, the nonmetallic mud scraper includes a scraper, two chains connected at both ends of the scraper and two movable first chain wheels for changing the direction of the two chains respectively, and the chain extends along the length direction of the sedimentation tank and is connected head to tail, further including the nonmetallic mud scraper safety operation protection system of any one of the above technical solutions, two scraper detection devices in each group of the scraper detection device are oppositely arranged on the two side walls respectively, and two tensioning force early warning devices are connected to the two first chain wheels respectively.

[0010] In some embodiments of the utility model, the sedimentation tank comprises a boss arranged at the top end of the sedimentation tank, the boss is provided with a through hole, the tensioning force early warning device comprises a tensioning force sensor and a tensioning rope, the tensioning force sensor is connected with the tensioning rope, and the end of the tensioning rope is connected with the first chain wheel, the tensioning force sensor and the tensioning rope can move through the through hole, and the tensioning force sensor is located in the through hole.

[0011] In some embodiments of the utility model, the nonmetallic mud scraper further comprises a driving device and a driving wheel, the driving wheel is connected with the chain, and the scraper detection device is arranged close to the driving wheel.

[0012] In some embodiments of the utility model, the nonmetallic mud scraper further includes a driving wheel and a second sprocket for changing the direction of the chain, the chain is sequentially driven by the driving wheel to pass through the first sprocket, the second sprocket and the driving wheel, 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.

[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0014] The nonmetallic mud scraper safety operation protection system and mud scraping system utilize the contact between the scraper detection device and the both sides of the scraper, can know the synchronization of the scraper detection device for contacting the both sides of the scraper, utilize the tensioning force early warning device and the sprocket connection, can know the tension change of the sprocket and then know whether the chain breaks or other problems, the utility model can detect the fault of the mud scraper and the type of the fault in time, is convenient for the maintenance of the mud scraper, and is helpful for timely termination of equipment operation to avoid greater loss. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is the front view structural schematic diagram of the nonmetallic mud scraper safety operation protection system embodiment of the utility model.

[0016] Fig. 2 It is the plan view structural schematic diagram of the nonmetallic mud scraper safety operation protection system embodiment of the utility model.

[0017] Fig. 3 It is the structural schematic diagram of the scraper detection device in the nonmetallic mud scraper safety operation protection system embodiment of the utility model.

[0018] Fig. 4 It is the structural schematic diagram of the tensioning force early warning device in the nonmetallic mud scraper safety operation protection system embodiment of the utility model.

[0019] The utility model is further explained in detail in combination with the drawings and specific embodiments. SPECIFIC EMBODIMENTS

[0020] As Figs. 1 to 4The embodiment of the utility model provides a kind of nonmetallic mud scraper safety operation protection system, can be applied to drinking water, domestic sewage and industrial sewage, petrochemical chemical sewage treatment etc. Environmental protection field, install in rectangular sedimentation tank nonmetallic mud scraper system of primary sedimentation tank, secondary sedimentation tank etc., mainly used in rectangular sedimentation tank such as various wastewater treatment primary sedimentation tank, secondary sedimentation tank etc. For collecting the nonmetallic mud scraper of pool bottom sediment sludge. Nonmetallic mud scraper can use nonmetallic chain or nonmetallic sprocket etc. Nonmetallic mud scraper can occasionally appear scraper both sides out of sync, chain breakage, chain off etc. Faults such as chain slip and breakage during operation, if not timely detection and shutdown, equipment continues to run will lead to greater loss. This embodiment adds detection device to judge equipment operation failure, can identify the various possible failures of nonmetallic mud scraper operation in advance without manual intervention, achieve early warning, avoid unnecessary loss caused by equipment failure continues to run, to improve the stability of product, provide great safety guarantee for equipment operation.

[0021] Specifically, the nonmetallic mud scraper safety operation protection system provided by the embodiment is used for mud scraping system, in other words, the embodiment also provides a mud scraping system with the nonmetallic mud scraper safety operation protection system.

[0022] The mud 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, thereby realizing mud scraping. The first sprocket 23 can be a driven wheel.

[0023] The nonmetallic mud scraper safety operation protection system 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 sides of the scraper 21 are synchronized, i.e., to detect the fault of the two sides of the scraper running out of sync. 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 off.

[0024] The scraper detection device 30 includes at least one group of scraper detection devices 30, and each group of scraper detection devices 30 includes two oppositely arranged scraper detection devices 30. The scraper detection device 30 is used to contact the two sides of the scraper 21. The two scraper detection devices 30 in each group of scraper detection devices 30 contact the two sides of the scraper 21 respectively, and generate a signal after contact. The time when the signal is generated is the time when the scraper detection device 30 contacts the scraper 21.

[0025] The tension early warning device 40 includes two tension early warning devices 40 arranged oppositely, each of which is used to contact the first chain wheel 23, and the tension early warning device 40 can detect the tension value of the first chain wheel 23 in real time or at a preset time interval.

[0026] Each of the scraper detection devices 30 is connected with the electrical control system 50, and each of the tension early warning devices 40 is connected with the electrical control system, and the electrical control system 50 can centrally process the signals sent by the scraper detection devices 30 and the tension early warning devices 40, and process, compare and judge the signals to determine whether there is a fault and the specific fault type such as the asynchronization of the two sides of the scraper, chain breakage and chain disengagement.

[0027] It can be seen that the technical scheme of the embodiment is mainly that the scraper detection devices 30 are installed on the two sides of the scraper 21, when the scraper 21 passes through the scraper detection devices 30, the synchronization of the two sides of the scraper 21 is detected to determine whether the scraper 21 has a fault such as tilting or derailment, the tension early warning devices 40 are installed on the first chain wheel 23, when the tension of the two sides of the tension sensor 46 suddenly decreases or the tension deviation of the two sides is large, it can be determined that the non-metallic mud scraper 20 has a fault such as chain breakage or derailment, so that the fault can be detected in time and the fault type can be determined, which provides convenience for subsequent alarm and shutdown. Moreover, the scraper detection devices 30, the tension early warning devices 40 and the electrical control system 50 can be conveniently added to the existing mud scraping system, and the application is flexible.

[0028] In some examples, the scraper detection device 30 includes a fixed seat 31, a swing rod 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 through the mounting mechanism such as a screw or a bolt, 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, and the third connecting section 36 is vertically arranged, the swing rod 32 is pivotally arranged on the third connecting section 36, so that the swing rod 32 automatically droops under the action of gravity. The swing rod 32 is used to contact the scraper 21, and the detection switch 33 is used to detect the swing of the swing rod 32, and the detection switch 33 arranged on the second connecting section 35 can conveniently detect the swing rod 32.

[0029] In some examples, the tension warning device 40 comprises a tension sensor 46, a tensioning mechanism 41, a pulley 42 and a tensioning rope 43. The tensioning mechanism 41 comprises an elastic member such as a spring, the first end of the elastic member is directly or indirectly connected to the tensioning rope 43, and the elastic member allows the tensioning rope 43 to move within a certain range. The tensioning rope 43 passes through the pulley 42 and is used to connect the first sprocket 23, and the pulley 42 is used to change the direction of the tensioning rope 43, thereby facilitating the installation of the tensioning mechanism 41 and the like above the sedimentation tank 10. The tension sensor 46 is provided on the tensioning mechanism 41 or the tensioning rope 43, for example, it can be connected to the elastic member, connected to the tensioning rope 43, connected between the tensioning mechanism 41 and the tensioning rope 43. The tension sensor 46 can be an existing tension sensor, for example, it can comprise 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 size of the pressure or tension by detecting the displacement of the tensioning mechanism 41 or the tensioning rope 43. The use of the elastic member can avoid the easy breakage of the tensioning rope 43 or the tension sensor 46.

[0030] In some examples, the tensioning mechanism 41 further comprises a fixed sleeve 44 and a movable sleeve 45 which 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 is in contact with the movable sleeve 45, the second end of the elastic member is in contact with 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 indirectly in contact, and the elastic member is arranged between the two sleeves to be more evenly stressed.

[0031] In some examples, the tension sensor 46 is inserted in the middle of the tensioning rope 43 and located between the tensioning mechanism 41 and the pulley 42, and the tension sensor 46 can better detect the tension received by the tensioning rope 43.

[0032] In some examples, the mud scraping system comprises a sedimentation tank 10 and a non-metallic mud scraper 20, the sedimentation tank 10 has two side walls located at both sides of the length direction of the sedimentation tank 10, the non-metallic mud scraper 20 comprises a scraper 21 extending along the width direction of the sedimentation tank 10, two chains 22 connected at both ends of the scraper 21, and two movable first sprockets 23 respectively used for changing the directions of the two chains 22, the first sprockets 23 are movable in a direction away from the orientation wheel 42, when the non-metallic mud scraper 20 is running, the chains 22 pull the first sprockets 23 to move, so that the larger tension force can be detected by the tension force early warning device 40. Since the size of the scraper 21 extending along the width direction of the sedimentation tank 10 is large, two chains 22 are needed to pull the both ends of the scraper 21 to move respectively. The chain 22 extends along the length direction of the sedimentation tank 10 and is connected end to end, and the chain 22 can move in a loop. The non-metallic mud scraper safety operation protection system, the two scraper detection devices 30 in each group of scraper detection devices 30 are oppositely arranged on the two side walls respectively, for detecting the synchronization of the movement of the both ends of the scraper. The two tension force early warning devices 40 are connected to the two first sprockets 23 respectively, for detecting whether the two chains are broken or off.

[0033] In some examples, the sedimentation tank 10 comprises a boss 11 provided at the top end of the sedimentation tank 10, the boss 11 is provided with a through hole 12, the boss 11 can shield above 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 force early warning device 40 comprises a tension force sensor 46 and a tension rope 43, the tension force sensor 46 is connected with the tension rope 43, the end of the tension rope 43 is connected with the first sprocket 23, for example, connected to the shaft center of the first sprocket 23 and allows the first sprocket 23 to rotate relative to the connection of the first sprocket 23 and the shaft center. The tension force sensor 46 and the tension rope 43 are both movably through the through hole 12, the tension force sensor 46 is located in the through hole 12, so as to protect the tension force sensor 46, and make the tension force early warning device 40 easy to install and more accurate to detect the tension force.

[0034] In some examples, the non-metallic mud scraper 20 further comprises 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 with the chain 22, and the scraper detection device 30 is arranged close to the driving wheel 25. The driving wheel 25 may, for example, be a rotating shaft with a sprocket structure, which can drive two chains 22 at the same time. The driving device 24 may, for example, be a motor or the like. Since the driving wheel 25 can provide pulling force, the chain 22 will be in tension when it is close to the driving wheel 25, and the scraper detection device 30 arranged close to the driving wheel 25 can more accurately reflect whether the both ends of the scraper 21 are out of synchronization.

[0035] In some examples, the non-metallic mud scraper 20 further comprises a driving wheel 25 and a second sprocket 26 for changing the direction of the chain 22, 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 turn. 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 arranged 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-metallic mud scraper 20. In this way, the non-metallic mud scraper 20 is subjected to more uniform and stable tension when it is running, and the first sprocket 23 can better move away from the pulley 42 under the driving of the chain 22.

[0036] In some examples, the present embodiment also provides a control method of the mud scraping system, which comprises the following steps:

[0037] Step one: obtaining the first signal sent by the scraper detection device 30 and the second signal sent by the tension warning device 40 when the non-metallic mud scraper 20 is running. 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 an intermittent tension signal, for example, the tension signal can be obtained when the first signal sent by the scraper detection device 30.

[0038] Step two: stopping the non-metallic mud scraper 20 from running when the time difference of the first signals sent by the two scraper detection devices 30 is greater than a first threshold value, or the second signal sent by any tension warning device 40 is less than a second threshold value, or the difference between the second signals sent by the two tension warning devices 40 is greater than a third threshold value. The time difference of the first signals sent by the two scraper detection devices 30 being greater than the first threshold value indicates that the running of the two sides of the scraper 21 is out of sync or out of sync. The second signal sent by any tension warning device 40 being less than the second threshold value indicates that the chain 22 is likely to be off-chain or broken. The difference between the second signals sent by the two tension warning devices 40 being greater than the third threshold value indicates that the two chains 22 are not evenly stressed, indicating that the chain 22 is likely to have a fault such as off-chain, broken chain, chain jamming, etc. The settings of the first threshold value, the second threshold value and the third threshold value allow the detected or calculated values to have a certain error, improving the stability of the system.

[0039] In some examples, in step two, the mud scraping system of the present embodiment can also send an alarm signal when a fault is detected. When the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, a first alarm signal is sent; when the second signal sent by any one of the tension warning devices 40 is less than the second threshold value, a second alarm signal is sent; when the difference of the second signals sent by the two tension warning devices 40 is greater than the third threshold value, a third alarm signal is sent. Different alarm signals are sent in different cases, so that the operator can understand the specific type of fault from the alarm signal. The alarm signal may, for example, be sound, light, electricity, display sign, etc.

[0040] In some examples, in step two, more types of different alarm signals can be sent according to different situations of the detection signals to determine the type, cause and / or location of the fault, so as to facilitate the operator to choose different maintenance methods.

[0041] For example, when the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, the second signal sent by any one of the tension warning devices 40 is greater than the second threshold value, and the difference of the second signals sent by the two tension warning devices 40 is less than the third threshold value, a fourth alarm signal is sent, at which time it can be inferred that the system only has a fault of asynchrony of the two ends of the scraper, and the operator can maintain the scraper 21 and / or the chain 22 according to the fourth alarm signal to make the two ends of the scraper synchronous.

[0042] When the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, and the second signal sent by any one of the tension warning devices 40 is less than the second threshold value, a fifth alarm signal is sent, at which time it can be inferred that the system has a chain breakage or chain disengagement fault and the asynchrony of the two ends of the scraper is caused by the fault, and the operator can maintain the chain 22 according to the fifth alarm signal to solve the chain breakage or chain disengagement problem.

[0043] When the time difference of the first signals sent by the two scraper detection devices 30 is greater than the first threshold value, the second signal sent by any one of the tension warning devices 40 is greater than the second threshold value, and the difference of the second signals sent by the two tension warning devices 40 is greater than the third threshold value, a sixth alarm signal is sent, at which time it can be inferred that the system has a chain 22 stuck fault causing the asynchrony of the two ends of the scraper 21, and the operator can maintain the system according to the fifth alarm signal to avoid the chain 22 stuck and maintain the asynchrony of the two ends of the scraper 21.

[0044] When the time difference of the first signals sent by the two scraper detection devices 30 is less than the first threshold value, and the second signal sent by any one of the tension warning devices 40 is less than the second threshold value, a seventh alarm signal is sent, at this time it can be inferred that the chain 22 appears to be broken or off, but the two ends of the scraper 21 are not out of sync, and the broken position of the chain 22 can be located away from the scraper detection device 30, and the operator can correspondingly perform maintenance.

[0045] When the time difference of the first signals sent by the two scraper detection devices 30 is less than the first threshold value, and the second signal sent by any one of the tension warning devices 40 is greater than the second threshold value, and the difference of the second signals sent by the two tension warning devices 40 is greater than the third threshold value, an eighth alarm signal is sent, at this time it can be inferred that the chain 22 appears to be stuck, but the two ends of the scraper 21 are not out of sync, and the chain 22 does not appear to be broken or off, and the operator can perform operations such as cleaning of the difficult-to-move obstacles existing locally in the pool bottom.

[0046] In some examples, the electrical control system 50 further comprises a display and input device 51 for displaying the first signals sent by the two scraper detection devices 30 and the second signals sent by the two tension warning devices 40, for example, displaying the time of the first signal and the tension value of the second signal, and for receiving input signals of the first threshold value, the second threshold value and the third threshold value. The display and input device 51 can include a separate display screen and keys, or it can be a touch screen with display and input functions. The first threshold value, the second threshold value and the third threshold value can be selected and adjusted according to the actual system environment, so as to determine the appropriate shutdown conditions.

[0047] In some embodiments of the utility model, the control method further comprises: when the time interval of the first signals sent by the adjacent two scrapers 21 passing through the scraper detection device 30 is greater than the fourth threshold value, stopping the non-metallic mud scraper from running. When the time interval of the first signals sent by the adjacent two scrapers 21 passing through the scraper detection device 30 is greater than the fourth threshold value, it indicates that the moving speed of the scraper 21 changes, at this time, faults such as unstable operation of the motor and existence of difficult-to-move obstacles in the pool bottom can occur, and the type of fault can be further judged in combination with whether the time difference of the first signals sent by the two scraper detection devices 30 is less than the first threshold value, whether the second signal sent by any one of the tension warning devices 40 is greater than the second threshold value, and whether the difference of the second signals sent by the two tension warning devices 40 is less than the third threshold value, or a corresponding alarm signal can be sent.

[0048] Finally, it needs to be emphasized that the above-mentioned is only the preferred embodiment of the utility model, and is not used for limiting the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A non-metallic scraper safety operation protection system for a scraper system, wherein the scraper system comprises 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 device is 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 base, a rocker arm and a detection switch; the fixed base 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 is 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 also includes a fixed sleeve and a movable sleeve that are nested with each other. 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.

5. The non-metallic scraper safe operation protection system according to claim 3 is characterized in that The tensioning force sensor is inserted in the middle of the tensioning rope and is located between the tensioning mechanism and the pulley.

6. 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 of the sedimentation tank in the longitudinal direction, and the non-metallic sludge scraper comprises a scraper, two chains connected at both ends of the scraper, and two movable first sprockets for changing the direction of the two chains, wherein the chains extend along the longitudinal 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 5, 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.

7. The mud scraping system according to claim 6, characterized in that The sedimentation tank includes a boss provided at the top of the sedimentation tank, and the boss is provided with a through hole; the tension force warning device includes a tension force sensor and a tension rope, the tension force sensor is connected to the tension rope, and the end of the tension rope is connected to the first sprocket; the tension force sensor and the tension rope can both be movably passed through the through hole, and the tension force sensor is located in the through hole.

8. The mud scraping system according to claim 6, characterized in that The non-metallic scraper also includes 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.

9. The mud scraping system according to claim 6, characterized in that 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, 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.

Images