Off-line dust removal device for electrical unit of power plant

Abstract

The utility model discloses an off-line dust removal device for a power plant electrical unit, which comprises a power plant electrical unit control cabinet and an off-line dust removal device body arranged at the top of the power plant electrical unit control cabinet, the right side of the power plant electrical unit control cabinet is fixedly connected with an air outlet filter screen matched with the multiple air outlet holes. According to the utility model, through a series of structures, automatic blowing and heat dissipation can be carried out on the interior of the power plant electrical unit control cabinet, so that the two filter screens used for air intake and dust impurity filtration can be automatically and alternately cleaned, dredged and dedusted off line at regular time according to a preset program, and the filter screens can be disassembled, assembled and cleaned without shutdown; the automatic degree of cleaning and dust removal is improved, the phenomenon that air inlet is affected due to blockage of dust impurities is reduced, the dust impurities discharged through back-blowing cleaning are conveniently collected in a centralized mode, the phenomenon that a large number of dust impurities are scattered outwards is reduced, and the cleaning and environment-friendly effects are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal for electrical units in power plants, and particularly relates to an off-line dust removal device for electrical units in power plants. Background Art

[0002] A variety of electrical components such as controllers, meters, and collectors are installed in the control cabinet of the electrical unit in the power plant. To ensure the stable operation of its multiple electrical components, a safe temperature environment is extremely important. Therefore, heat dissipation holes and fans are provided on the control cabinet of the electrical unit in the power plant for heat dissipation work. A filter screen is often installed at the air intake position of the control cabinet to filter dust and impurities in the incoming gas, preventing a large amount of dust and impurities from entering the interior of the control cabinet and causing damage to the internal electrical components.

[0003] However, with use, a large amount of dust and impurities inevitably accumulate and cover the outside of the filter screen at the air intake position of the control cabinet of the electrical unit in the power plant, causing blockage and affecting the ventilation effect. Personnel need to regularly disassemble and clean the filter screen; the existing cleaning method requires temporary shutdown for cleaning work, and it cannot perform off-line automatic cleaning, dredging, and dust removal work without shutdown, reducing work efficiency. The degree of automation and convenience of dust cleaning is not ideal. In view of this, this application proposes an off-line dust removal device for electrical units in power plants to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide an off-line dust removal device for electrical units in power plants to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An off-line dust removal device for electrical units in power plants, including a control cabinet of the electrical unit in the power plant and an off-line dust removal device body installed on its top. A plurality of air outlet holes are provided on the right side of the control cabinet of the electrical unit in the power plant, and an air outlet filter screen adapted to the plurality of air outlet holes is fixedly connected to the right side of the control cabinet of the electrical unit in the power plant. The off-line dust removal device body includes a fixed box fixedly connected to the top of the control cabinet of the electrical unit in the power plant. A blower is embedded and fixed on the bottom inner wall of the fixed box and is communicated with its interior. The bottom of the blower is an air outlet and extends into the control cabinet of the electrical unit in the power plant. Two air inlet pipes are fixedly connected and communicated to the top of the fixed box, and a filter screen is fixedly connected to the top end of the air inlet pipe. The provided blower is used to actively blow air into the control cabinet of the electrical unit in the power plant for heat dissipation when controlled by a PLC controller. When the blower is turned on, its top air inlet sucks air in the fixed box, so that the external gas is filtered by the filter screen and then sucked into through the air inlet pipe. The air outlet holes and the air outlet filter screen are used for the internal hot air to be discharged. By using the method of blowing air outwards, it is not easy for impurities to adhere and accumulate on the outside of the air outlet filter screen.

[0006] A horizontal guide and drive assembly is fixedly installed between the left side of the fixed box and the top left side of the control cabinet of the power plant electrical unit. A PLC controller is fixedly installed on and electrically connected to the top of the horizontal guide and drive assembly. A U-shaped rod is fixedly connected to the top of the horizontal guide and drive assembly. The right bottom end of the U-shaped rod slidably penetrates into the fixed box and is fixedly connected to a blowing and cleaning assembly. Both the blowing and cleaning assembly and the blower are electrically connected to the PLC controller. The blowing and cleaning assembly is located below the intake pipe on the left side and cooperates with the filter net on the left side. The right top end of the U-shaped rod is fixedly connected to a slag collection assembly. The slag collection assembly is located above the filter net on the left side and cooperates with the filter net on the left side. The horizontal guide and drive assembly is used to control the U-shaped rod to move alternately to the right and left at regular intervals under the control of the PLC controller. The blowing and cleaning assembly is used to move to the lower part of the intake pipe on the right side when the U-shaped rod moves to the right, and is controlled by the PLC controller to start the reverse blowing and cleaning and dredging of the filter net on the right side, and to move to the lower part of the filter net on the left side for reverse blowing and cleaning when moving to the left. The slag collection assembly is used to move integrally with the U-shaped rod when the U-shaped rod moves to the right and left, and to centrally collect the impurities cleaned by reverse blowing.

[0007] Preferably, the horizontal guide and drive assembly includes a multi-stage electric telescopic rod fixedly installed on the top left side of the control cabinet of the power plant electrical unit. The PLC controller is fixedly installed on and electrically connected to the top of the multi-stage electric telescopic rod. An L-shaped guide rod is fixedly connected between the left side of the fixed box and the top left side of the control cabinet of the power plant electrical unit. A moving plate fixedly connected to the extended end of the multi-stage electric telescopic rod is slidably sleeved on the L-shaped guide rod. The top of the moving plate is fixedly connected to the bottom left side of the U-shaped rod. A touch switch electrically connected to the PLC controller is fixedly installed on both the left side of the fixed box and the left inner wall. The touch switch on the left side cooperates with the moving plate.

[0008] Preferably, the blowing and cleaning assembly includes a reverse blowing box fixedly connected to the right bottom end of the U-shaped rod. The top of the reverse blowing box is in movable contact with the top inner wall of the fixed box. An air pump electrically connected to the PLC controller is fixedly installed at the bottom of the reverse blowing box. The air outlet of the air pump extends into the reverse blowing box. A plurality of blowing holes are formed in the top of the reverse blowing box. The blowing holes are located below the intake pipe on the left side and cooperate with the filter net on the left side. The touch switch on the right side is in tight contact with the left side of the reverse blowing box.

[0009] Preferably, the slag collection assembly includes an air collecting hood fixedly connected to the right top end of the U-shaped rod. The air collecting hood is located above the filter net on the left side and cooperates with the filter net on the left side. A conduit is fixedly connected and communicated at the top of the air collecting hood. External threads are formed on the left side of the conduit and are screwed with a nut. An air-permeable dust collection cloth bag is fixedly connected and communicated on the left side of the nut. The air-permeable dust collection cloth bag is adhesively fixed to the top of the U-shaped rod.

[0010] Preferably, a temperature sensor electrically connected to the PLC controller is fixedly installed on the top inner wall of the control cabinet of the power plant electrical unit.

[0011] Preferably, the PLC controller is a programmable controller with a timing function.

[0012] Preferably, a female magic tape is fixedly connected to the bottom of the breathable dust collection cloth bag, and a male magic tape adhesively connected to the female magic tape is fixedly connected to the top of the U-shaped rod.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. Through the cooperation of the PLC controller, temperature sensor, fan, fixed box, intake pipe and filter screen, it can automatically blow air and dissipate heat inside the control cabinet of the electrical unit in the power plant, and filter and intercept dust and impurities in the incoming gas;

[0015] 2. Through the cooperation of the filter screen, intake pipe, horizontal guide and horizontal drive assembly, U-shaped rod and cleaning assembly, when presetting the start time of the multi-stage electric telescopic rod by using the PLC controller according to the on-site cleaning requirements, and presetting to control the air pump to start for 15 seconds after receiving the opening and closing signal, it can alternately clean, dredge and remove dust from the two filter screens offline and automatically according to the preset program, without stopping the machine to disassemble and clean the filter screen, improving the degree of automation of cleaning and dust removal, and reducing the phenomenon that its air intake is affected by being blocked by dust and impurities;

[0016] 3. Through the cooperation of the U-shaped rod and the slag collection assembly, it can centrally collect the dust and impurities discharged by the reverse blowing and cleaning, reduce the phenomenon of a large amount of dust and impurities scattering outside, and improve the environmental protection effect of cleaning.

[0017] By setting a series of structures, the present utility model can automatically blow air and dissipate heat inside the control cabinet of the electrical unit in the power plant, facilitate alternately cleaning, dredging and removing dust from the two filter screens for air intake filtration of dust and impurities offline and automatically according to the preset program, without stopping the machine to disassemble and clean the filter screen, improving the degree of automation of cleaning and dust removal, reducing the phenomenon that its air intake is affected by being blocked by dust and impurities, and facilitating the centralized collection of the dust and impurities discharged by the reverse blowing and cleaning, reducing the phenomenon of a large amount of dust and impurities scattering outside, and improving the environmental protection effect of cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an offline dust removal device for an electrical unit in a power plant proposed by the present utility model;

[0019] Figure 2 It is a three-dimensional structure schematic diagram of the offline dust removal device body of an offline dust removal device for an electrical unit in a power plant proposed by the present utility model;

[0020] Figure 3 is Figure 1 The enlarged sectional structure schematic diagram of part A in

[0021] In the figure: 100 is the control cabinet of the electrical unit of the power plant; 101 is the air outlet filter screen; 1 is the fixed box; 2 is the fan; 3 is the intake pipe; 4 is the filter screen; 5 is the L-shaped guide rod; 6 is the multi-stage electric telescopic rod; 7 is the moving plate; 8 is the PLC controller; 9 is the U-shaped rod; 10 is the touch switch; 11 is the back-blowing box; 12 is the air blowing hole; 13 is the air pump; 14 is the air collecting hood; 15 is the conduit; 16 is the breathable dust collection cloth bag. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] As Figures 1 to 3 shown, an off-line dust removal device for an electrical unit of a power plant proposed in this embodiment includes a control cabinet 100 of the electrical unit of the power plant and an off-line dust removal device body installed on its top. A plurality of air outlet holes are provided on the right side of the control cabinet 100 of the electrical unit of the power plant. An air outlet filter screen 101 adapted to the plurality of air outlet holes is fixedly connected to the right side of the control cabinet 100 of the electrical unit of the power plant. The off-line dust removal device body includes a fixed box 1 fixedly connected to the top of the control cabinet 100 of the electrical unit of the power plant. A fan 2 communicating with its interior is fixedly installed on the bottom inner wall of the fixed box 1. The bottom of the fan 2 is the air outlet and extends into the control cabinet 100 of the electrical unit of the power plant. Two intake pipes 3 are fixedly connected to the top of the fixed box 1. A filter screen 4 is fixedly connected to the top end of the intake pipe 3. A horizontal guide and horizontal drive assembly is fixedly installed between the left side of the fixed box 1 and the left side of the top of the control cabinet 100 of the electrical unit of the power plant. A PLC controller 8 is fixedly installed and electrically connected to the top of the horizontal guide and horizontal drive assembly. The PLC controller 8 is a programmable controller with a timing function; a temperature sensor electrically connected to the PLC controller 8 is fixedly installed on the top inner wall of the control cabinet 100 of the electrical unit of the power plant. The provided temperature sensor is used to detect the temperature inside the control cabinet 100 of the electrical unit of the power plant and transmit the temperature value to the PLC controller 8. The PLC controller 8 controls the fan 2 to start blowing for heat dissipation when the temperature value is higher than the preset value. Among them, the heat dissipation temperature value is preset by the PLC controller 8 and the fan 2 is automatically controlled to start when the received temperature value is higher than the preset value. This is a mature basic heat dissipation control technology for the existing fan 2, and no further description will be given here;

[0024] The provided blower 2 is used to actively blow air for heat dissipation into the control cabinet 100 of the power plant's electrical unit when controlled by the PLC controller 8. When the blower 2 is turned on, its top air inlet sucks air into the fixed box 1, causing external air to be drawn in through the air inlet pipe 3 after being filtered by the filter screen 4. The air outlet holes and the air outlet filter screen 101 are used for discharging the hot air inside. By means of blowing the air outwards, it is not easy for impurities to adhere and accumulate on the outside of the air outlet filter screen 101.

[0025] The top of the horizontal guide and horizontal drive assembly is fixedly connected with a U-shaped rod 9. The right bottom end of the U-shaped rod 9 slides into the fixed box 1 and is fixedly connected with a blowing and cleaning assembly. A horizontal guide hole for slidingly sleeving the outside of the U-shaped rod 9 is opened on the left side of the fixed box 1, which serves to allow the right bottom end of the U-shaped rod 9 to pass through and guide its horizontal sliding. Both the blowing and cleaning assembly and the blower 2 are electrically connected to the PLC controller 8. The blowing and cleaning assembly is located below the left air inlet pipe 3 and cooperates with the left filter screen 4. The right top end of the U-shaped rod 9 is fixedly connected with a slag collection assembly, which is located above the left filter screen 4 and cooperates with the left filter screen 4. The horizontal guide and horizontal drive assembly is used to control the U-shaped rod 9 to alternately move right and left at regular intervals under the control of the PLC controller 8. The blowing and cleaning assembly is used to move to the lower part of the right air inlet pipe 3 when the U-shaped rod 9 moves to the right, and is controlled by the PLC controller 8 to turn on to blow and clean and dredge the right filter screen 4, and to move to the lower part of the left filter screen 4 for blowing and cleaning work when moving to the left. The slag collection assembly is used to move integrally with the U-shaped rod 9 when it moves right and left, and to centrally collect the impurities blown and cleaned.

[0026] Specifically, the horizontal guide and horizontal drive assembly includes a multi-stage electric telescopic rod 6 fixedly installed on the left side of the top of the control cabinet 100 of the power plant electrical unit. The PLC controller 8 is fixedly and electrically connected to the top of the multi-stage electric telescopic rod 6. There is a fixed connection between the left side of the fixed box 1 and the left side of the top of the control cabinet 100 of the power plant electrical unit with an L-shaped guide rod 5. A moving plate 7 fixedly connected to the extended end of the multi-stage electric telescopic rod 6 is slidably sleeved on the L-shaped guide rod 5. Among them, a guiding through hole slidably sleeved on the outer side of the L-shaped guide rod 5 is opened on the right side of the moving plate 7, which has the effect of guiding the horizontal sliding of the moving plate 7. The top of the moving plate 7 is fixedly connected to the bottom left side of the U-shaped rod 9. Touch switches 10 electrically connected to the PLC controller 8 are fixedly installed and embedded on both the left side and the left inner wall of the fixed box 1. The touch switch 10 on the left side cooperates with the moving plate 7. The multi-stage electric telescopic rod 6, the moving plate 7, and the L-shaped guide rod 5 are arranged in cooperation. According to the on-site cleaning requirements, the PLC controller 8 is used to preset the start time of the multi-stage electric telescopic rod 6. When the multi-stage electric telescopic rod 6 is controlled to start forward, it drives the moving plate 7 to move to the right. The moving plate 7 drives the U-shaped rod 9 to move to the right. When the moving plate 7 moves to squeeze and contact the touch switch 10 on the left side, an opening and closing signal is transmitted to the PLC controller 8. When the PLC controller 8 receives the opening and closing signal, it controls the multi-stage electric telescopic rod 6 to automatically close and waits to control the multi-stage electric telescopic rod 6 to start in the reverse direction until the next cleaning time is reached.

[0027] Further, the blowing and cleaning assembly includes a back-blowing box 11 fixedly connected to the right bottom end of the U-shaped rod 9. The top of the back-blowing box 11 is in movable contact with the inner wall of the top of the fixed box 1. A gas pump 13 electrically connected to the PLC controller 8 is fixedly installed at the bottom of the back-blowing box 11. The air outlet of the gas pump 13 extends into the back-blowing box 11. A plurality of blowing holes 12 are formed in the top of the back-blowing box 11. The blowing holes 12 are located below the left intake pipe 3 and cooperate with the left filter screen 4. The touch switch 10 on the right is in tight contact with the left side of the back-blowing box 11. The provided back-blowing box 11, gas pump 13 and blowing holes 12 cooperate. When the U-shaped rod 9 moves to the right, it drives the back-blowing box 11 to move to the right below the right intake pipe 3. When the PLC controller 8 receives the opening and closing signal, it also controls the gas pump 13 to start. The PLC controller 8 is pre-set to set the start time of the gas pump 13 to 15 seconds each time. When the gas pump 13 starts, it supplies gas into the back-blowing box 11. The gas blows upward through the plurality of blowing holes 12 to realize the back-blowing cleaning and dredging of the right filter screen 4. Until the gas pump 13 is turned off after 15 seconds. When it reaches the next set cleaning time, the multi-stage electric telescopic rod 6 is controlled to start in the reverse direction and drives the U-shaped rod 9 to move to the left through the moving plate 7, so as to drive the back-blowing box 11 to move to the left below the left intake pipe 3. The back-blowing box 11 squeezes and touches the touch switch 10 on the right to transmit the opening and closing signal to the PLC controller 8, and then controls the gas pump 13 to start again to perform the back-blowing cleaning and dust removal work on the left filter screen 4. And so on, to realize the effect of alternately cleaning and dredging the two filter screens 4 offline automatically according to the preset program, without stopping the machine to disassemble and clean the filter screens 4, improving the degree of automation of cleaning and dust removal, and reducing the phenomenon that it is blocked by dust and impurities and affects air intake.

[0028] Further, the slag collection assembly includes a gas collecting hood 14 fixedly connected to the right top end of the U-shaped rod 9. The gas collecting hood 14 is located above the left filter screen 4 and cooperates with the left filter screen 4. A conduit 15 is fixedly connected and communicated at the top of the gas collecting hood 14. An external thread is provided on the outer left side of the conduit 15 and is screwed with a nut. A breathable dust collection cloth bag 16 is fixedly connected and communicated on the left side of the nut. The breathable dust collection cloth bag is adhesively fixed to the top of the U-shaped rod 9. The bottom of the breathable dust collection cloth bag 16 is fixedly connected with a female magic tape, and the top of the U-shaped rod 9 is fixedly connected with a male magic tape adhesively bonded to the female magic tape, which plays the effect of facilitating the convenient adhesive positioning of the breathable dust collection cloth bag 16. The provided gas collecting hood 14, conduit 15, nut and breathable dust collection cloth bag 16 cooperate. When the U-shaped rod 9 moves left and right, it will drive the gas collecting hood 14 to move integrally. When back-blowing and cleaning the filter screen 4, the dust and impurities discharged by blowing are sequentially discharged into the breathable dust collection cloth bag 16 through the gas collecting hood 14 and the conduit 15. The gas is discharged through the breathable dust collection cloth bag 16, and the dust and impurities are intercepted and collected in the breathable dust collection cloth bag 16, realizing the effect of centralized collection of the dust and impurities discharged by back-blowing and cleaning.

[0029] The usage method of this embodiment is as follows: The temperature sensor detects the temperature inside the control cabinet 100 of the power plant electrical unit in real time and transmits the temperature value to the PLC controller 8. When the temperature value exceeds the preset threshold, the PLC controller 8 controls the fan 2 to start. When the fan 2 starts, its top air inlet sucks the air inside the fixed box 1, so that the external air is filtered by the filter screen 4 and then sucked into the intake pipe 3. The fan 2 blows air downward to dissipate heat inside the control cabinet 100 of the power plant electrical unit. The internal hot air is blown out to the outside through the air outlet hole and the air outlet filter screen 101, achieving the effect of automatically blowing and dissipating heat inside the control cabinet 100 of the power plant electrical unit;

[0030] During the filtering process, it is inevitable that the top of the filter screen 4 will be covered with dust and impurities, which will affect the ventilation effect. According to the on-site cleaning requirements in advance, the PLC controller 8 is used to preset the start time of the multi-stage electric telescopic rod 6, and it is also preset to control the air pump 13 to start for 15 seconds when receiving the opening and closing signal. When the cleaning time is reached, the PLC controller 8 controls the multi-stage electric telescopic rod 6 to start forward, driving the moving plate 7 to slide to the right on the L-shaped guide rod 5. The moving plate 7 drives the U-shaped rod 9 to move to the right. The U-shaped rod 9 drives the back-blowing box 11 and the air collecting hood 14 to move to the lower and upper sides of the right intake pipe 3 respectively. When the moving plate 7 moves to the right and squeezes and touches the touch switch 10 on the left, the touch switch 10 on the left transmits the opening and closing signal to the PLC controller 8. At this time, the PLC controller 8 controls the multi-stage electric telescopic rod 6 to close and controls the air pump 13 to start for 15 seconds. When the air pump 13 starts, it supplies air to the back-blowing box 11, and the air blows upward through the multiple air blowing holes 12, realizing the back-blowing cleaning and dredging of the right filter screen 4. When the next cleaning time is reached, the PLC controller 8 controls the multi-stage electric telescopic rod 6 to start in the reverse direction and drives the U-shaped rod 9 to move leftward to reset through the moving plate 7, driving the back-blowing box 11 and the air collecting hood 14 to move leftward to the lower and upper sides of the left intake pipe 3 respectively. The back-blowing box 11 squeezes and touches the touch switch 10 on the right to transmit the opening and closing signal to the PLC controller 8, and then controls the multi-stage electric telescopic rod 6 to close and the air pump 13 to start again. At this time, it turns to the back-blowing cleaning and dust removal work of the left filter screen 4. By analogy, the effect of alternately cleaning, dredging, and removing dust from the two filter screens 4 according to the preset program offline and at regular intervals is achieved. By using the method of alternately back-blowing, cleaning, dredging, and removing dust, there is no need to stop the machine to disassemble and clean the filter screen 4, improving the degree of automation of cleaning and dust removal and reducing the phenomenon that it is blocked by dust and impurities and affects air intake;

[0031] During the reverse blowing and cleaning process, the dust gas blown up to the upper part sequentially enters the air collecting hood 14 and the conduit 15 and is discharged into the breathable dust collecting cloth bag 16. The gas is discharged through the breathable dust collecting cloth bag 16, and the dust impurities are intercepted and collected in the breathable dust collecting cloth bag 16, achieving the effect of centralized collection of the dust impurities discharged by the reverse blowing and cleaning, reducing the phenomenon of a large amount of dust impurities scattering outside, and improving the cleaning and environmental protection effect. After multiple uses, the operator can pull up the breathable dust collecting cloth bag 16 to drive the separation of the female magic tape and the male magic tape, and reverse-rotate the nut to separate it from the conduit 15, so as to clean or replace the breathable dust collecting cloth bag 16.

[0032] Among them, the PLC controller 8, the multi-stage electric telescopic rod 6, the air pump 13 and the touch switch 10 in the present utility model are well-known to those skilled in the art, belonging to conventional means or common general knowledge. Those skilled in the art can make any selection according to their needs or convenience. In addition, programming the PLC controller 8 to set the start time and then controlling the start of the multi-stage electric telescopic rod 6 at a fixed time, and controlling the multi-stage electric telescopic rod 6 to close and the air pump 13 to start when the touch switch 10 is touched to transmit the opening and closing signal are basic time and touch programming numerical control methods well-known to those skilled in the art. The corresponding basic control program can be realized by programming personnel according to the requirements of this step, and all belong to conventional means or common general knowledge, so they will not be elaborated here.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An off-line dust removal device for an electrical unit in a power plant, comprising an electrical unit control cabinet (100) in the power plant and an off-line dust removal device body installed on the top thereof, wherein a plurality of air outlets are arranged on the right side of the electrical unit control cabinet (100) in the power plant, and an air outlet filter (101) adapted to the plurality of air outlets is fixedly connected to the right side of the electrical unit control cabinet (100) in the power plant, wherein: The offline dust removal device body comprises a fixed box (1) fixedly connected to the top of the electrical unit control cabinet (100) of the power plant; a fan (2) connected to the interior of the fixed box (1) is embedded and fixedly mounted on the bottom inner wall of the fixed box (1); the bottom of the fan (2) is an air outlet and extends into the electrical unit control cabinet (100) of the power plant; two air inlet pipes (3) are connected and fixedly connected to the top of the air inlet pipe (3); a filter screen (4) is fixedly connected to the top of the air inlet pipe (3); A transverse guide and transverse drive assembly is fixedly installed between the left side of the fixed box (1) and the left side of the top of the power plant electrical unit control cabinet (100); the top of the transverse guide and transverse drive assembly is fixedly connected to and electrically connected to a PLC controller (8); the top of the transverse guide and transverse drive assembly is fixedly connected to a U-shaped rod (9); the right bottom end of the U-shaped rod (9) slides into the fixed box (1) and is fixedly connected to a blow-off assembly; the blow-off assembly and the fan (2) are both electrically connected to the PLC controller (8); the blow-off assembly is located below the air intake pipe (3) on the left side and cooperates with the filter screen (4) on the left side; the right top end of the U-shaped rod (9) is fixedly connected to a slag collection assembly; the slag collection assembly is located above the filter screen (4) on the left side and cooperates with the filter screen (4) on the left side.

2. The off-line dust removal device for an electrical unit in a power plant according to claim 1, characterized in that: The transverse guide and transverse drive assembly comprises a multi-stage electric telescopic rod (6) fixedly mounted on the left side of the top of the power plant electrical unit control cabinet (100); a PLC controller (8) is fixed and electrically connected to the top of the multi-stage electric telescopic rod (6); an L-shaped guide rod (5) is fixedly connected between the left side of the fixed box (1) and the left side of the top of the power plant electrical unit control cabinet (100); a movable plate (7) fixedly connected to the extended end of the multi-stage electric telescopic rod (6) is slidably sleeved on the L-shaped guide rod (5); the top of the movable plate (7) is fixedly connected to the left side of the bottom of the U-shaped rod (9); a touch switch (10) electrically connected to the PLC controller (8) is embedded and fixed on the left side and the inner wall of the left side of the fixed box (1); the touch switch (10) located on the left side cooperates with the movable plate (7).

3. The off-line dust removal device for an electrical unit in a power plant according to claim 2, characterized in that: The blow-cleaning assembly comprises a back-blowing box (11) fixedly connected to the right bottom end of the U-shaped rod (9), the top of the back-blowing box (11) is in active contact with the top inner wall of the fixed box (1), an air pump (13) electrically connected to the PLC controller (8) is fixedly installed at the bottom of the back-blowing box (11), the air outlet of the air pump (13) extends into the back-blowing box (11), a plurality of blowing holes (12) are opened at the top of the back-blowing box (11), the blowing holes (12) are located below the air inlet pipe (3) on the left and cooperate with the filter screen (4) on the left, and the touch switch (10) on the right is in tight contact with the left side of the back-blowing box (11).

4. The off-line dust removal device for an electrical unit in a power plant according to claim 1, characterized in that: The slag collecting assembly comprises an air collecting hood (14) fixedly connected to the top end of the right side of the U-shaped rod (9); the air collecting hood (14) is located above the filter screen (4) on the left side and cooperates with the filter screen (4) on the left side; a conduit (15) is connected and fixed to the top of the air collecting hood (14); an external thread is provided on the left side of the outer side of the conduit (15) and a nut is screwed on it; a breathable dust collecting bag (16) is connected and fixed to the left side of the nut; and the breathable dust collecting bag is adhesively fixed to the top of the U-shaped rod (9).

5. The off-line dust removal device for an electrical unit in a power plant according to claim 1, characterized in that: A temperature sensor electrically connected to a PLC controller (8) is fixedly mounted on the top inner wall of the power plant electrical unit control cabinet (100).

6. The off-line dust removal device for an electrical unit in a power plant according to claim 1, characterized in that: The PLC controller (8) is a programmable controller with a timing function.

7. The off-line dust removal device for an electrical unit in a power plant according to claim 4, characterized in that: The bottom of the breathable dust collecting bag (16) is fixedly connected with a female Velcro, and the top of the U-shaped rod (9) is fixedly connected with a male Velcro bonded to the female Velcro.

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