Protection against over-limit due to soot blower controller failure

Abstract

An over-limit protection device is disclosed that protects a sootblower and prevents further damage from occurring.SOLUTION: A sootblower housing, a transport tube disposed within the sootblower housing, a movable assembly disposed on the transport tube, and an over-limit protection assembly disposed between the transport tube and the movable assembly, wherein the movable assembly causes the over-limit protection assembly to move back and forth on the transport tube to interrupt false electrical signals in the event of over-travel of the sootblower, thereby preventing further damage to the electrical equipment.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of sootblowers, and more particularly to a protection device for preventing over-limit failures in controllers for sootblowers. [Background technology]

[0002] The telescopic soot blower is controlled by a PLC installed on-site; a remote operator simply sends simple commands to the PLC controller installed on-site via the DCS system, and the PLC controller automatically executes a series of operations including the soot blower's forward movement, backward movement, stopping, opening and closing of the air source valve, and evacuation in the event of an emergency.In addition, by feeding back signals of each operation status to the DCS system, the operator can constantly monitor the operating status of the equipment.

[0003] However, over long-term use of the PLC, the internal relay element may fail, making it impossible to cut off the electrical signal to the AC contactor. The AC contactor is equipped with an interlock mechanism, so if an incorrect electrical signal is sent, the normal electrical signal will not be executed. As a result, the sootblower will continue to operate in either the forward or reverse state. If it encounters an obstacle in this state, this could cause serious hazards, such as mechanical damage to the sootblower body, damage to the drive mechanism, motor burnout, and even overheating and deformation of the sootblower casing, making it impossible to remove for a long period of time. Summary of the Invention

[0004] The present invention has been proposed in view of the problem that the internal relay element of the PLC breaks down over a long period of use in the above-mentioned conventional technology, making it impossible to cut off the electrical signal to the AC contactor.

[0005] SUMMARY OF THE INVENTION Therefore, the present invention aims to provide an over-limit protection device for preventing a controller failure for a sootblower, to protect the sootblower and prevent further damage from occurring.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution, namely, a sootblower housing, a transport pipe installed in the sootblower housing, a movable assembly installed in the transport pipe, and an over-limit protection assembly installed between the transport pipe and the movable assembly, wherein the movable assembly allows the over-limit protection assembly to move back and forth on the transport pipe, and cut off erroneous electrical signals when the sootblower moves excessively, thereby preventing further damage to electrical equipment.

[0007] In a preferred embodiment of the over-limit prevention protection device due to failure of a soot blower controller described in the present invention, the movable assembly comprises a main body provided in the transport pipe, a track plate provided on both sides of the inner wall of the soot blower housing, a movable member provided within the main body, a power member provided within the main body, and a rolling member provided on the main body.

[0008] In a preferred embodiment of the over-limit prevention protection device due to failure of a soot blower controller described in the present invention, the movable member comprises an adjustment shaft rotatably mounted on the main body, a first helical gear mounted on one side of the adjustment shaft, a helical gear bearing mounted within the adjustment shaft and meshing with and connected to the first helical gear, a stud mounted within the helical gear bearing, a connection block mounted on the stud, a limit rod mounted at the bottom of the connection block, movable rollers mounted on both sides of the connection block near the raceway plate, and a raceway groove formed in the raceway plate.

[0009] In a preferred embodiment of the over-limit prevention protection device due to failure of a soot blower controller described in the present invention, the power member comprises a motor provided within the main body, a second helical gear provided at the output end of the motor, a third helical gear provided within the main body and connected to mesh with the second helical gear, a threaded rod provided on one side of the third helical gear, a toothed shaft provided within the main body and interlocking with the threaded rod, output gears provided at both ends of the toothed shaft penetrating both sides of the main body, and a gear groove opened below the raceway plate.

[0010] In a preferred embodiment of the protection device for preventing over-limit failure due to a failure of a soot blower controller described in the present invention, the rolling member comprises a fixed bracket provided on the main body, a roller provided on the fixed bracket, and a rolling groove opened in the transport pipe.

[0011] In a preferred embodiment of the over-limit prevention device for preventing a controller failure for a soot blower according to the present invention, the main body has a split structure and is fixedly connected by bolts.

[0012] As a preferred embodiment of the over-limit protection device for preventing failure of a soot blower controller described in the present invention, the over-limit protection assembly comprises a limit switch provided in the transport pipe, a switch pin shaft provided in the transport pipe, and a toggle member provided in the main body.

[0013] In a preferred embodiment of the over-limit prevention protection device for a soot blower controller due to failure described in the present invention, the toggle member comprises a toggle shaft provided on the main body, a rotating shaft provided on the toggle shaft, and a fixing bolt provided on the toggle shaft.

[0014] In a preferred embodiment of the over-limit prevention protection device for a soot blower controller according to the present invention, the rotating shaft is rotatably connected to the main body, and the fixing bolt is fixedly connected to the main body by screwing.

[0015] In a preferred embodiment of the over-limit protection device for preventing a soot blower controller from being over-faulted as described in the present invention, the limit switch is directly electrically connected to the AC contactor.

[0016] The beneficial effect of the present invention is that the limit switch acts directly on the AC contactor, and when the soot blower operates beyond the limit position, the movable assembly drives the toggle member to directly cut off the erroneous electrical signal, preventing the execution of the signal, and then sends an electrical signal to the soot blower through PLC control to return it to its initial position, thereby avoiding damage to mechanical or electrical equipment and reducing the burden and difficulty of subsequent inspection work. [Brief explanation of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments, and it should be understood that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram showing the overall structure of a protection device for preventing excessive limits due to a failure of a soot blower controller according to the present invention; [Figure 2] 1 is a schematic diagram showing the structure of a movable assembly of a protection device for preventing over-limit failure of a controller for a soot blower according to the present invention; FIG. [Figure 3] 1 is a schematic diagram showing the structure of the transport pipe of the protection device for preventing over-limit due to a failure of the soot blower controller according to the present invention; FIG. [Figure 4] 1 is a schematic diagram showing the structure of the main body of the protection device for preventing over-limit due to a failure of the soot blower controller according to the present invention; [Figure 5] 1 is a schematic diagram showing the cross-sectional structure of the main body of the protection device for preventing excessive limit due to failure of the soot blower controller according to the present invention. [Figure 6]1 is a schematic diagram showing the structure of the threaded rod of the over-limit prevention protection device due to a failure of the soot blower controller according to the present invention; FIG. [Figure 7] FIG. 5 is an enlarged view of the structure of FIG. 4A of the present invention. [Figure 8] 1 is a schematic diagram showing the electrical connection structure of the limit switch of the protection device for preventing over-limit failure due to a controller for a soot blower according to the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the above objects, features and advantages of the present invention more clear and understandable, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings of the specification.

[0019] Numerous specific details are set forth below to facilitate a thorough understanding of the present invention; however, the present invention may be practiced in other ways than those described herein, and similar extensions may be made by those skilled in the art without departing from the spirit of the present invention, and therefore the present invention is not limited by the specific examples disclosed below.

[0020] Also, as used herein, "one embodiment" or "embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one embodiment of the present invention. The appearances of the phrase "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they mutually exclusive embodiments separate or alternative from other embodiments.

[0021] Furthermore, the present invention will be described in detail in conjunction with schematic drawings, and when describing the embodiments of the present invention in detail, for ease of explanation, the cross-sectional views showing the structure of the device are partially enlarged and not according to the normal scale, and the schematic drawings are merely illustrative and do not limit the scope of protection of the present invention, and should include three-dimensional spatial dimensions of length, width and depth during actual production.

[0022] Example 1 Referring to Figure 1, Example 1 of the present invention provides an over-limit prevention protection device for a sootblower controller due to failure, which includes a sootblower housing 100, a transport pipe 200 arranged in the sootblower housing 100, which serves to transport steam and support a movable assembly 300, a movable assembly 300 arranged in the transport pipe 200, which moves back and forth on the transport pipe 200 to drive the opening and closing operation of the over-limit protection assembly 400, and an over-limit protection assembly 400 arranged between the transport pipe 200 and the movable assembly 300, which blocks erroneous electrical signals and retreats the sootblower to its initial position according to the command of the PLC. The movable assembly 300 causes the over-limit protection assembly 400 to move back and forth on the transport pipe 200, and blocks erroneous electrical signals when the sootblower moves excessively, thereby preventing further damage to electrical equipment.

[0023] During normal operation, when the soot blower is in normal operation, the movable assembly 300 drives the over-limit protection assembly 400 to move back and forth on the transport pipe 200. During this time, the over-limit protection assembly 400 cannot close as the movable assembly 300 moves. If the internal relay element of the PLC breaks down over a long period of time, causing the electrical signal to the AC contactor to fail to be cut off, the movable assembly 300 will continue to move in only one direction, exceeding the limit position. In this over-limit state, the over-limit protection assembly 400 will activate, forming a closed circuit and directly cutting off the erroneous electrical signal. This allows the PLC to properly execute the retreat command, returning the faulty soot blower to its original position and reliably preventing damage to the equipment.

[0024] Example 2 1 to 7, a second embodiment of the present invention differs from the first embodiment in that a main body 301 is moved.

[0025] Compared to Example 1, the movable assembly 300 further comprises a main body 301 as a support structure movably arranged on the transport pipe 200, a track plate 302 arranged on both sides of the inner wall of the soot blower housing 100 and supporting the movable member 303, the movable member 303 arranged within the main body 301 and moving back and forth on the transport pipe 200 in conjunction with the power member 304, the power member 304 arranged within the main body 301 and generating a moving power, and a rolling member 305 arranged in the main body 301 and reducing the frictional force between the main body 301 and the transport pipe 200 and preventing mechanical wear.

[0026] Here, the movable member 303 is rotatably installed on the main body 301 and includes an adjustment shaft 303a that adjusts the rotation of the first helical gear 303b, a first helical gear 303b that is installed on one side of the adjustment shaft 303a and that rotates and drives a helical gear bearing 303c, and a helical gear bearing 303c that is installed inside the adjustment shaft 303a and is connected to and meshes with the first helical gear 303b, and the helical gear bearing 303c rotates and presses the stud 303d, thereby driving the stud 303d to rise or fall. The bearing is provided with a gear bearing 303c, a stud 303d provided in the helical gear bearing 303c, a connection block 303e provided on the stud 303d and connecting the movable roller 303g, a limit rod 303f provided at the bottom of the connection block 303e for positioning, movable rollers 303g provided on both sides of the connection block 303e near the track plate 302, and track grooves 303h provided in the track plate 302 for guiding the rolling of the movable roller 303g.

[0027] Here, the power member 304 is provided in the main body 301 and includes a motor 304a that generates power, a second helical gear 304b that is provided at the output end of the motor 304a and transmits the power of the motor 304a to a third helical gear 304c, a third helical gear 304c that is provided in the main body 301 and engages with the second helical gear 304b to drive the rotation of the threaded rod 304d, and a third helical gear 304d that is provided on one side of the third helical gear 304c and transmits the power of the motor 304a to a third helical gear 304c. the toothed shaft 304e is provided within the main body 301 and works in conjunction with the threaded rod 304d to drive the rotation of the output gear 304f; the toothed shaft 304e penetrates both sides of the main body 301 and is provided at both ends of the toothed shaft 304e, which meshes with the gear groove 304g; and the gear groove 304g is opened below the track plate 302.

[0028] Here, the rolling member 305 is provided on the main body 301 and comprises a fixed bracket 305a to which a fixed roller 305b is attached, a roller 305b provided on the fixed bracket 305a which moves on the transport pipe 200 in conjunction with the rolling groove 305c and converts sliding friction into rolling friction, and a rolling groove 305c provided on the transport pipe 200 which defines the rolling path of the roller 305b and has a positioning guide function.

[0029] Here, the main body 301 has a split structure and is fixedly connected by bolt fastening, and this structure makes it easy to attach and detach the parts inside the main body 301.

[0030] During use, when the main body 301 is attached to the soot blower, the roller 305b is fitted into the rolling groove 305c, allowing the main body 301 to slide back and forth on the transport pipe 200. Furthermore, the cooperation between the roller 305b and the rolling groove 305c prevents the main body 301 from rotating in the transport pipe 200, ensuring the safety of workers. At this time, when the adjustment shaft 303a is rotated, the helical gear bearing 303c rotates, driving the connecting block 303e up and down, thereby fitting the moving roller 303g into the track groove 303h and the output gear 304f into the gear groove 304g. After installation is complete, the soot blower can be operated, and the PLC controls the forward or reverse rotation of the motor 304a to rotate the screw rod 304d and move the main body 301 forward or backward. The interlocking structure of the threaded rod 304d and the toothed shaft 304e prevents the body 301 from sliding unintentionally when the motor 304a is not operating, improving the operational stability of the device and providing a degree of protection for the electrodes.

[0031] The other structures are the same as those in the first embodiment.

[0032] Example 3 1 to 4, 7 and 8, the third embodiment of the present invention differs from the second embodiment in that the electric signal of the PLC is cut off when the main body 301 moves excessively.

[0033] Compared with Example 2, the over-limit protection assembly 400 further includes a limit switch 401 provided in the transport pipe 200 for controlling the on / off of the AC contactor, a switch pin shaft 402 provided in the transport pipe 200 and linked with a toggle member 403 for turning off the limit switch 401 and blocking erroneous electrical signals when the main body 301 moves beyond the limit, and a toggle member 403 provided in the main body 301 for contacting the switch pin shaft 402 and operating the switch pin shaft 402 to switch the limit switch 401 on / off.

[0034] Here, the toggle member 403 is provided on the main body 301 and includes a toggle shaft 403a that toggles the switch pin shaft 402, a rotating shaft 403b rotatably provided on the toggle shaft 403a, and a fixing bolt 403c rotatably provided on the toggle shaft 403a.

[0035] Here, the rotating shaft 403b is rotatably connected to the main body 301, and the fixing bolt 403c is fixedly connected to the main body 301 by screw fastening. Cooperation between the rotating shaft 403b and the fixing bolt 403c enables the toggle shaft 403a to be deployed and retracted, preventing accidental contact between the toggle shaft 403a and the switch pin shaft 402 when the worker installs the main body 301.

[0036] Here, the limit switch 401 is directly electrically connected to the AC contactor and is used as a substitute for the command line of the electrical signal, and the other end is connected to the original command line of the electrical signal.

[0037] During use, under normal conditions, the switch pin shaft 402 is in a conductive state with the AC contactor. When the soot blower is in operation, the main body 301 drives the toggle member 403 under the control of the PLC, which moves back and forth between the two sets of switch pin shafts 402. At this time, the toggle shaft 403a does not come into contact with the switch pin shaft 402 during the operating orbit of the main body 301. If the internal relay element of the PLC fails due to long-term use, the AC contactor is equipped with an interlock mechanism, so even if the correct signal is sent, it will not be executed. At this time, the soot blower is limited to either forward or backward operation. When the soot blower operates beyond the limit position, the toggle shaft 403a contacts the switch pin shaft 402 and toggles the switch pin shaft 402, thereby cutting off the limit switch 401. This prevents the erroneous electrical signal from being executed. The PLC can then control the soot blower by sending an electrical signal to return it to its initial position. This eliminates the need for human intervention and significantly reduces the maintenance workload. During equipment maintenance, only the PLC needs to be inspected, and after the procedure is completed, the switch pin shaft 402 can be manually reset to resume use, reducing the difficulty of maintenance work.

[0038] The other structures are the same as those in the second embodiment.

[0039] It should be noted that the structure and arrangement of the present application, as shown in several different exemplary embodiments, are merely illustrative. While only a few embodiments are described in detail in this disclosure, it will be readily apparent to those reading this disclosure that numerous modifications (e.g., changes in the dimensions, scale, structure, shape, and proportions of various elements, parameter values ​​such as temperature and pressure, mounting arrangements, use of materials, color, orientation, etc.) are possible without substantially departing from the novel teachings and advantages of the subject matter described herein. For example, elements shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be reversed or otherwise changed, and the nature, number, or location of separate elements may be altered. Accordingly, all such modifications are intended to be within the scope of the present invention. The order or sequence of any process or method steps may be modified or re-ordered according to alternative embodiments. In the claims, any "apparatus plus function" clause is intended to cover structures that perform the functions described herein, and is intended to encompass not only structurally equivalent but also equivalent structures. Other substitutions, variations, modifications, and omissions may be made in the design, operating conditions, and arrangements of the exemplary embodiments without departing from the scope of the present invention. Accordingly, the present invention is not limited to a particular embodiment, but rather covers various modifications that fall within the scope of the appended claims. Moreover, in order to provide a concise description of exemplary embodiments, it is not necessary to describe all features of an actual embodiment (i.e., features that are not relevant to the best mode presently contemplated for carrying out the invention or that are not relevant to the implementation of the invention).

[0040] It should be noted that the above-described embodiments are only for illustrating the technical solutions of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art may make modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and these modifications or substitutions should be included in the scope of the claims of the present invention.

Claims

1. An over-limit protection device for preventing a sootblower from exceeding its limit due to a controller failure, comprising: a sootblower housing (100); a transport pipe (200) provided within the sootblower housing (100); a movable assembly (300) provided in the transport pipe (200); and an over-limit protection assembly (400) provided between the transport pipe (200) and the movable assembly (300), wherein the movable assembly (300) causes the over-limit protection assembly (400) to move back and forth on the transport pipe (200), thereby cutting off erroneous electrical signals in the event of excessive movement of the sootblower, thereby preventing further damage to electrical equipment.

2. The movable assembly (300) comprises a main body (301) provided in the transport pipe (200), a track plate (302) provided on both sides of the inner wall of the soot blower housing (100), a movable member (303) provided within the main body (301), a power member (304) provided within the main body (301), and a rolling member (305) provided on the main body (301).

3. 3. The protective device for preventing an over-limit failure due to a failure of a soot blower controller as described in claim 2, wherein the movable member (303) comprises: an adjustment shaft (303a) rotatably mounted on the main body (301); a first helical gear (303b) mounted on one side of the adjustment shaft (303a); a helical gear bearing (303c) mounted in the adjustment shaft (303a) and meshing with the first helical gear (303b); a stud (303d) mounted in the helical gear bearing (303c); a connection block (303e) mounted on the stud (303d); a limit rod (303f) mounted at the bottom of the connection block (303e); movable rollers (303g) mounted on both sides of the connection block (303e) close to the raceway plate (302); and a raceway groove (303h) formed in the raceway plate (302).

4. 4. The protection device for preventing an over-limit failure due to a failure of a soot blower controller as described in claim 3, wherein the power member (304) comprises: a motor (304a) provided in the main body (301); a second helical gear (304b) provided at the output end of the motor (304a); a third helical gear (304c) provided in the main body (301) and meshing with the second helical gear (304b); a threaded rod (304d) provided on one side of the third helical gear (304c); a toothed shaft (304e) provided in the main body (301) and interlocking with the threaded rod (304d); output gears (304f) provided on both ends of the toothed shaft (304e) penetrating both sides of the main body (301); and a gear groove (304g) opened below the raceway plate (302).

5. The protection device for preventing over-limit failure due to failure of a soot blower controller as described in claim 4, characterized in that the rolling member (305) comprises a fixed bracket (305a) provided on the main body (301), a roller (305b) provided on the fixed bracket (305a), and a rolling groove (305c) opened in the transport pipe (200).

6. The protection device for preventing over-limit failure of a controller for a soot blower as claimed in claim 5, characterized in that the main body (301) has a split structure and is fixedly connected by bolts.

7. The over-limit protection device for preventing over-limit failure due to a failure of a controller for a soot blower as described in claim 6, characterized in that the over-limit protection assembly (400) comprises a limit switch (401) provided in the transport pipe (200), a switch pin shaft (402) provided in the transport pipe (200), and a toggle member (403) provided in the main body (301).

8. The over-limit prevention protection device for preventing failure of a soot blower controller as described in claim 7, characterized in that the toggle member (403) comprises a toggle shaft (403a) provided on the main body (301), a rotating shaft (403b) provided on the toggle shaft (403a), and a fixing bolt (403c) provided on the toggle shaft (403a).

9. The over-limit prevention protection device for a soot blower controller due to failure as described in claim 8, characterized in that the rotating shaft (403b) is rotatably connected to the main body (301), and the fixing bolt (403c) is fixedly connected to the main body (301) by screwing.

10. The soot blower controller over-limit protection device according to claim 9, characterized in that the limit switch (401) is directly electrically connected to the AC contactor.

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