Slag conveyor chain breakage protection device and protection method thereof

Abstract

The invention discloses a chain breakage protection device and method for a submerged chain conveyor, and the device comprises a driven wheel which rotates along with a conveying belt; and the sensing piece is provided with a detection block which is in contact with the driven wheel and is used for collecting potential information. High-low level change frequency is collected through a sensor, and the state of the device is confirmed; time delay prerequisites are set at different nodes according to working conditions, and misjudgment is prevented; and the PLC logic of the secondary loop is set according to sensing requirements. Based on sensing and an existing workpiece operation principle, basic chain breakage early warning logic is designed. Through combination of the soft and hard surfaces, efficient and simplified chain breakage early warning logic is formed, the equipment reliability is improved, and the influence on the environment is reduced by timely shutdown, so that the overall operation efficiency and economic benefits of a power plant are improved.

Description

Technical Field

[0001] The invention relates to the field of thermal power generation, in particular to a slag scoop chain breaking protection device and a protection method thereof. Background Art

[0002] Because the desulfurization bucket elevator in the background frame of the conveying plate of the slag machine in this patent is 35 meters high, and the control box is located on the top of the limestone silo, it is often prone to chain break failure (at least 1 failure per month), and the slag machine cannot be stopped when the chain is broken, causing the chain to get stuck inside the slag machine and the overcurrent protection action can stop it. During the treatment, the unit needs to reduce the load and the slag water in the slag machine must be completely discharged before it can be treated. This process is time-consuming and may cause environmental pollution and personal injury. Although the existing protection mechanism can prevent further damage to the equipment, it has not effectively reduced the fault handling time and the impact on the environment.

[0003] The design of the secondary circuit used for risk avoidance is very complex and cannot meet the special requirements of timely response under such extreme working conditions. Therefore, it is necessary to simplify the secondary circuit and improve the response efficiency through the cooperation of some hard devices, thereby reducing the frequency of failures, improving equipment reliability, ensuring the safety of workers, and reducing the impact on the environment, thereby improving the overall operating efficiency and economic benefits of the power plant. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problem that the existing protection mechanism in the above and / or prior art can prevent further damage to the equipment but fails to effectively reduce the fault handling time and the impact on the environment, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is to simplify the detection of exercise faults through the cooperation of some rigid devices.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a slag scoop chain breaking protection device, comprising: a driven wheel, rotating with the conveyor belt;

[0008] The sensor is provided with a detection block which contacts the driven wheel and collects potential information.

[0009] As a preferred solution of the chain-breaking protection device for a slag dredger of the present invention, the driven wheel upper ring is provided with a convex measuring point and a flat measuring point;

[0010] The detection block is provided with high and low level acquisition points;

[0011] The high and low level acquisition points are in cyclic contact with the convex measuring point and the flat measuring point.

[0012] As a preferred solution of the slag dredger chain breaking protection device of the present invention, wherein: the width distance of the convex measuring point is D;

[0013] The width distance of the flat measuring point is d;

[0014] Both D and d have process error fluctuations, and D≠d.

[0015] As a preferred solution of the slag scoop chain breaking protection device of the present invention, the driven wheels are placed on both sides of the conveyor belt.

[0016] As a preferred solution of the chain breaking protection device for a slag dredger of the present invention, wherein:

[0017] The beneficial effects of the present invention are as follows: through sensing and existing workpiece operation principles, a basic chain break warning logic is designed.

[0018] The secondary circuit design for risk avoidance is very complex and cannot meet the special requirements of timely response in such extreme working conditions.

[0019] Therefore, the technical problem to be solved by the present invention is to simplify the secondary circuit and improve the response efficiency.

[0020] In order to solve the above technical problems, the present invention also provides the following technical solutions: a slag scoop chain break protection method, comprising the slag scoop chain break protection device, and collecting the high and low level change frequencies through a sensor to confirm the device status;

[0021] Set delay prerequisites at different nodes based on working conditions to prevent misjudgment;

[0022] Set the PLC logic of the secondary loop according to the sensing requirements.

[0023] As a preferred solution of the chain-breaking protection method for a slag dredger of the present invention, the sensor is provided with the high and low level collection points, and the high level and the low level are collected cyclically;

[0024] When a cycle of high level and low level is collected, a rotation signal is collected.

[0025] As a preferred solution of the chain-breaking protection method for a slag dredger of the present invention, wherein: the high and low level loop logics are preceded by delay signals, namely TM1, TM2, TM3, TM4, and TM5;

[0026] TM2 and TM4 are responsible for the high level delay on the left and right sides respectively;

[0027] TM3 and TM5 are responsible for the low level delay on the left and right sides respectively.

[0028] As a preferred solution of the chain breaking protection method of the slag dredger described in the present invention, the delay time is 30s, that is,

[0029] If only a high level or a low level is detected within 30 seconds without alternating changes, it is judged that a link break has occurred in the working condition.

[0030] As a preferred solution of the chain breaking protection method of the slag picker described in the present invention, when a chain breaking signal appears,

[0031] In the PLC ladder logic, the normally open node Q0.4 is closed, which in turn activates Q0.2;

[0032] Q0.2 outputs a signal to the chain break detection nodes SQ1 and SQ2, and feeds back to the running oil pump KM1 for shutdown operation.

[0033] As a preferred solution of the chain break protection method for a slag picker described in the present invention, the delay signal TM1 is responsible for delaying the detection just after starting by 60 seconds to avoid misjudgment caused by the slow rotation of the driven wheel when starting.

[0034] The beneficial effects of the present invention are as follows: through the combination of soft and hard aspects, an efficient and simplified chain break warning logic is formed, equipment reliability is improved, and timely shutdown is carried out to reduce the impact on the environment, thereby improving the overall operating efficiency and economic benefits of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0036] Figure 1 A schematic diagram of the mechanical structure of a chain breaking protection device for a slag dredger according to an embodiment of the present invention;

[0037] Figure 2 A PLC startup ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0038] Figure 3 A TM1 delay ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0039] Figure 4 A TM2 delay ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0040] Figure 5 A TM3 delay ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0041] Figure 6 A TM4 delay ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0042] Figure 7 A TM5 time-delay ladder logic diagram of a slag machine chain-breaking protection method according to an embodiment of the present invention;

[0043] Figure 8 An output ladder logic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0044] Fig. 9 It is the PLC part of the output electrical schematic diagram of a slag machine chain breaking protection method according to an embodiment of the present invention;

[0045] Fig.10 An electrical schematic diagram of a warning signal shutdown of a slag machine chain break protection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0049] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] Example 1

[0051] Reference Figure 1 This embodiment provides a chain-breaking protection device for a slag lifter, including a driven wheel 100, which rotates with the conveyor belt. The driven wheel 100 and the conveyor belt have indirect gear meshing by default, but are not in direct contact. The power source of the conveyor belt is provided by a fixed motor in the desulfurization bucket elevator system;

[0052] Furthermore, the sensing member 200 is provided with a detection block 201 in contact with the driven wheel 100 to collect potential information. The sensing member 200 can be directly regarded as a sensor, which is arranged on one side of the driven wheel to monitor the rotation state of the driven wheel and then confirm the working state of the conveyor belt;

[0053] After the chain breaks, the rotation of the driven wheel will stop immediately, which means that the conveyor belt cannot be in normal working condition at this time.

[0054] Example 2

[0055] Reference Figure 1 , which is the second embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: a convex measuring point 100a and a flat measuring point 100b are provided on the driven wheel 100, and the potential of the points to be measured also has a difference, and the change of the high potential and the low potential will be directly reflected on the sensor in contact with it;

[0056] Furthermore, the detection block 201 is a measuring point on the sensor 200, and its surface is provided with high and low level acquisition points, which can convert the high and low level potential change information into digital signals and feed back to the entire power system or the early warning terminal. The driven wheels 100 are placed on both sides of the conveyor belt, and the structures on both sides are exactly the same, and the same potential monitoring is performed. No matter which side has a problem, it needs to be repaired in time.

[0057] In detail, the high and low level acquisition points are in cyclic contact with the convex measuring point 100a and the flat measuring point 100b, that is, the convex measuring point 100a and the flat measuring point 100b are alternately arranged on the driven wheel 100, and send different level signals to the detection block 201 in turn.

[0058] Further, the width distance of the convex measuring point 100a is D, and the width distance of the measuring point 100b is d;

[0059] Different D and d have process error fluctuations, and from the overall point of view, D≠d, that is, the time when the high and low levels appear on the sensor is not completely uniform, and may even cause collisions with the driven wheel 100 due to process problems, or the influence of collisions and slag gravity during the operation of the desulfurization bucket elevator, affecting the monitoring effect.

[0060] Example 3

[0061] Reference Figures 1-2 , which is the third embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: the frequency of high and low level changes is collected by the sensor to confirm the device status, which is the basic underlying logic of the entire technical solution, and cooperates with the above-mentioned protection device to achieve the effect;

[0062] Furthermore, delays are set at different nodes in combination with working conditions to prevent misjudgment. Due to the process errors and size differences of D and d discussed at the end of Example 2, and the monitoring effects brought about by some specific working conditions when implemented in reality, it is impossible to avoid them at a low cost. Therefore, it is necessary to consider these out-of-bounds conditions during monitoring, and make trial and error in advance to avoid misjudgment.

[0063] The PLC logic of the secondary circuit is set according to the sensing requirements. This part is mainly reflected in the ladder diagram.

[0064] The sensor is provided with high and low level collection points, which collect high and low levels cyclically. When a cycle of high and low levels is collected, a rotation signal is collected. The continuous existence of rotation signals indicates that the driven wheel is always in a rotating state.

[0065] Example 4

[0066] Reference Figures 1 to 8 , which is the fourth embodiment of the present invention, and this embodiment provides a slag machine chain break protection method. This embodiment is based on the previous embodiment, and the difference from the previous embodiment is that: the high and low level loop logic is preceded by a delay signal, namely TM1, TM2, TM3, TM4, and TM5; these are all displayed on the PLC ladder diagram.

[0067] The existence of the delayed signals TM2~TM5 is mainly to avoid the situation of misjudgment of signals mentioned above. Therefore, the cycle of collecting electrical signals is placed within a certain time period. If there is no change in the electrical signal within the time period, it means that a real link break has occurred. If the electrical signal has not changed for a long time just because of some external factors, then within the specified cycle time, its fault tolerance can be expanded to ensure that the subsequent secondary signal confirmation can be received.

[0068] TM2 and TM4 are responsible for the high level delay on the left and right sides respectively;

[0069] TM3 and TM5 are responsible for the low level delay on the left and right sides respectively.

[0070] The delay time is 30s, that is, if only a high level or a low level is detected within 30s and no alternating changes occur, it is judged that a link break occurs in the working condition.

[0071] In the PLC ladder diagram, we can see that %TM1 is used as a timer. By presetting the time of 60s, and storing the timer state %M1, Q output is true to address %Q0.2;

[0072] Similarly, the input (IN) of %TM2 is determined by the logical AND (AND) of %M1 and %I0.5. When both %M1 and %I0.5 are true, %TM2 starts timing. If the timer reaches the preset value of 30, the output Q will become true and activate %M2.

[0073] The principle of TM3~TM5 is the same as that of TM2 mentioned above. After the output of %TM1~%TM5 is true, %M2 is activated and closed, and the next step instruction is given to %Q0.4, thereby completing the final oil pump shutdown signal transmission.

[0074] Example 5

[0075] Reference Figures 1 to 10 , which is the fifth embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: when a link break signal appears, in the PLC ladder logic, the normally open node Q0.4 is closed, and then Q0.2 is started. The normally open node Q0.4 can be regarded as a checkpoint for the overall process in the logic to proceed downward. Only when the normally open node is closed can the subsequent Q0.2, that is, the signal transmission at the electrical signal output end, be confirmed to be stable and forward;

[0076] In detail, in the entire PLC electrical principle system, Q0.2 outputs signals to the chain break detection nodes SQ1 and SQ2. The two detection nodes can be regarded as the judgment result feedback paths on the left and right sides. Regardless of whether SQ1 or SQ2 receives the electrical signal, it should be promptly fed back to the running oil pump KM1 for shutdown operation.

[0077] Example 6

[0078] Reference Figures 1 to 10 , which is the sixth embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that the delay signal TM1 is responsible for delaying the detection after the start by 60 seconds to avoid the driven wheel 100 rotating slowly when starting and causing misjudgment. The normal complete start of the power system of the slag loader involves the start of many linkage components, so the start time will affect the running speed of the driven wheel.

[0079] It takes a certain amount of time to go from slow rotation to a uniform speed for normal operation, and it also takes a certain amount of time for the electrical signal to give the driven wheel operation information, so giving a 60s delay node in advance can also ensure that misjudgment does not occur.

[0080] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0081] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0082] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0083] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A chain break protection device for a slag scooping machine, based on a conveyor belt carrying slag, characterized in that: include, A driven wheel (100) rotates following the conveyor belt; The sensor (200) is provided with a detection block (201) which contacts the driven wheel (100) and collects potential information.

2. A slag scoop chain breaking protection device according to claim 1, characterized in that: The driven wheel (100) is provided with a convex measuring point (100a) and a flat measuring point (100b) on the upper ring; The detection block (201) is provided with high and low level collection points; The high and low level acquisition points are in cyclic contact with the convex measuring point (100a) and the flat measuring point (100b).

3. A slag scoop chain breaking protection device according to claim 2, characterized in that: The width distance of the convex measuring point (100a) is D; The width distance of the flat measuring point (100b) is d; Both D and d have process error fluctuations, and D≠d.

4. A slag scoop chain breaking protection device according to claim 1 or 3, characterized in that: The driven wheels (100) are placed on both sides of the conveyor belt.

5. A slag dredger chain break protection method, characterized in that: The invention comprises a slag scoop chain breaking protection device as claimed in claim 4, and The sensor collects the frequency of high and low level changes to confirm the device status; Set delay prerequisites at different nodes based on working conditions to prevent misjudgment; Set the PLC logic of the secondary loop according to the sensing requirements.

6. A slag dredger chain breaking protection method according to claim 5, characterized in that: The sensor is provided with the high and low level collection points, and cyclically collects high and low levels; When a cycle of high level and low level is collected, a rotation signal is collected.

7. A slag dredger chain breaking protection method according to claim 6, characterized in that: The high and low level loop logic is preceded by a delayed signal, namely TM1, TM2, TM3, TM4, and TM5; TM2 and TM4 are responsible for the high level delay on the left and right sides respectively; TM3 and TM5 are responsible for the low level delay on the left and right sides respectively.

8. A slag dredger chain breaking protection method according to claim 7, characterized in that: The delay time is 30s, that is, If only a high level or a low level is detected within 30 seconds without alternating changes, it is judged that a link break has occurred in the working condition.

9. A slag dredger chain breaking protection method according to claim 7, characterized in that: When a link break signal occurs, In the PLC ladder logic, the normally open node Q0.4 is closed, which in turn activates Q0.2; Q0.2 outputs a signal to the chain break detection nodes SQ1 and SQ2, and feeds back to the running oil pump KM1 for shutdown operation.

10. A slag dredger chain breaking protection method according to claim 8, characterized in that: The delay signal TM1 is responsible for delaying the detection immediately after startup by 60 seconds, so as to avoid misjudgment caused by the driven wheel (100) rotating slowly when starting.

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