Stepping type device for removing dust of air pre-heater

Abstract

The invention discloses a stepping device, and particularly relates to a stepping device for removing dust of an air pre-heater, which comprises a driving device, a shifting block support is connected onto the driving device, a stepping shifting block is arranged on the shifting block support, shifting teeth are arranged on the stepping shifting block, and the shifting teeth are matched with a toothed plate. The two-way conversion stepping device is installed on the outer side of the air pre-heater, and furnace shutdown repair and maintenance are not needed. The toothed plate is convenient to machine without finish machining, the material utilization rate is high, and the manufacturing cost is low. And the device is mounted outside the flue and can be maintained and replaced in time. Limiting plates on the two sides of the stepping shifting block and a toothed plate limiting pin are adopted for bidirectional conversion, and the effect is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of dust cleaning equipment, and in particular to a step-by-step device for dust cleaning of an air preheater. Background Art

[0002] At present, in order to improve the thermal efficiency of the boiler and reduce the heat loss of flue gas, an air preheater is usually installed at the tail of the boiler. When the air preheater is working, dust will accumulate on its surface, affecting the thermal efficiency of the heat exchanger and hindering the circulation of flue gas. The dust accumulated on the surface of the air preheater is mostly a mixture of ammonium bisulfate and dust particles, which can easily corrode and damage the heat exchange tubes of the air preheater. Therefore, it is necessary to clean the air preheater through dust cleaning equipment.

[0003] The patent with application number 202311179229.1 proposes a step-by-step device that uses a cylinder step-by-step drive to drive the cleaning device. The short-stroke cylinder drives the step-by-step device to circulate and achieve a cleaning distance of any length. When the cleaning element is blocked by the accumulated dust between the heat exchange tubes and cannot operate, it will maintain a certain driving force and will not be overloaded and cause equipment damage. However, its driving method has disadvantages. The two-way conversion stepping mechanism is located in the air preheater. The furnace needs to be stopped for maintenance and repair, and it is necessary to enter the flue, which is inconvenient to use. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a step-by-step device for cleaning an air preheater to solve the current technical problems.

[0005] The technical solution adopted by the present invention to solve its technical problem is: The present invention provides a step-by-step device for cleaning an air preheater, comprising: a driving device, a shift block support connected to the driving device, a step-by-step shift block provided on the shift block support, a shift tooth provided on the step-by-step shift block, the shift tooth cooperated with a tooth plate, the tooth plate was fixed on the frame of a tooth plate trolley, and the driving device was arranged outside the flue.

[0006] Preferably, the shift block support includes a mounting plate, a wear-resistant sleeve is provided on the mounting plate, a guide rod is provided inside the wear-resistant sleeve, a track plate is also provided on the mounting plate, a shift block shaft is provided through the track plate, a shift block is provided on the shift block shaft, a limit plate is provided on the shift block, and the limit plates are installed on both sides of the tooth plate.

[0007] Preferably, the driving device is a cylinder, a piston rod is arranged in the cylinder, and the piston rod is connected to the stepping block through a block support.

[0008] Preferably, the driving device is fixed on a cylinder bracket, the cylinder bracket is fixed on a guide rail frame, and a guide rod is installed on the cylinder bracket.

[0009] Preferably, the toothed plate trolley is connected to a push-pull rod, and the push-pull rod is connected to a dust cleaning trolley.

[0010] Preferably, support rollers are installed at the four corners of the frame of the toothed plate trolley, and the support rollers are arranged on the guide rails at the inner edge of the guide rail frame.

[0011] Preferably, limit pins are fixed on both sides of the tooth plate, and the shifting teeth of the stepping shifting block are inserted into the tooth grooves of the tooth plate.

[0012] Preferably, the driving device is fixed on a cylinder bracket, the cylinder bracket is fixed on a trolley, and a guide rod is installed on the cylinder bracket.

[0013] Preferably, the tooth plate is fixed on the track frame, the trolley is connected to a push-pull rod, and the push-pull rod is connected to a dust cleaning trolley.

[0014] Preferably, support rollers are installed at the four corners of the frame of the trolley, and the support rollers are arranged on the guide rails at the inner edge of the guide rail frame.

[0015] The beneficial effects of the present invention are: (1) The two-way conversion stepping device is installed on the outside of the air preheater and does not require shutdown for repair and maintenance.

[0016] (2) The tooth plate is easy to process and does not require fine processing, with high material utilization and low manufacturing cost. Moreover, it can be installed outside the flue for timely maintenance and replacement.

[0017] (3) The limit plates on both sides of the stepping block and the limit pins on the toothed plate are used for two-way conversion, which makes the effect more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 1 is a schematic structural diagram of a step-by-step device for cleaning an air preheater according to an embodiment of the present invention; Figure 2 1 is a schematic structural diagram of a step-by-step device for cleaning an air preheater according to an embodiment of the present invention; Figure 3 1 is a schematic structural diagram of a step-by-step device for cleaning an air preheater according to an embodiment of the present invention; Figure 4 1 is a schematic structural diagram of a step-by-step device for cleaning an air preheater according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a step-by-step device for cleaning an air preheater according to an embodiment of the present invention. Description of Reference Numerals

[0019] exist Figure 1-Figure 5Among them, the limit pin 1; the tooth plate 2; the supporting roller 3; the cylinder 4; the shift block support 5; the guide rod 6; the push-pull rod 7; the cylinder support 8; the trolley 9; the guide rail frame 10; the tooth plate trolley 11; the wear-resistant sleeve 12; the connecting plate 13; the shifting gear 14; the stepping shift block 15; the limit plate 16; the shift block shaft 17; the cotter pin 18; the track plate 19; and the mounting plate 20. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention provides a step-by-step device for cleaning an air preheater, comprising: The device consists of: cylinder 4, cylinder bracket 8, guide rod 6, push-pull rod 7, shift block support 5, step shift block 15, tooth plate 2, limit pin 1, tooth plate trolley frame, support roller 3, guide rail frame 10. The driving components include cylinder 4, cylinder bracket 8, guide rod 6; the two-way conversion stepping mechanism includes shift block support 5, step shift block 15, shift block shaft 17, tooth plate 2, limit pin 1.

[0022] The cylinder bracket 8 is installed on the upper side of the outer guide rail frame 10 of the flue through threads, the cylinder 4 is installed on one side of the cylinder bracket 8, the piston rod passes through the cylinder bracket 8 and is connected to the mounting plate 20 of the shift block support 5 through threads, and the guide rod 6 passes through the wear-resistant sleeve 12 on the shift block support 5 and is fixed to the cylinder bracket 8; the track plates 19 on both sides of the shift block support 5 (parallel to the cross-section side of the piston rod) are provided with through holes, and shafts are installed in the through holes. The position is limited by the cotter pins 18 on both sides of the shaft. The stepping block 15 can rotate left and right around the axis in the support, and the bottom surface of the connecting plate 13 of the shift block support 5 contacts the end surface of the shift tooth 14 to limit the rotation range. The cleaning trolley is connected to one end of the push-pull rod 7 extending into the flue, and the other end of the push-pull rod 7 outside the flue is fixedly connected to the frame of the toothed plate trolley 11 through threads. Support rollers 3 are installed at the four corners of the frame of the toothed plate trolley 11 to roll along the movement axis of the piston rod in the guide rail of the guide rail frame 10. Limit pins 1 are fixed on both sides of the toothed plate 2, and the toothed plate 2 is fixed on the frame of the toothed plate trolley 11. The shifting teeth 14 of the stepping block 15 are inserted into the tooth grooves of the toothed plate 2.

[0023] Working principle of the device: the cylinder 4 is started, the piston rod extends forward to push the shift block support 5 forward, and the stepping shift block 15 is blocked by the tooth surface on the tooth plate 2 as the shift block support 5 moves forward, and then rotates around the axis to slide over the tooth and enter the front tooth groove; the piston rod retracts to pull the shift block support 5, and the end face of the shifting tooth 14 of the stepping shift block 15 is pressed against the tooth surface of the tooth plate 2, driving the dust cleaning trolley connected to the push-pull rod 7 to move a distance, the length of this distance is the tooth pitch, and this cycle is repeated to realize the backward stepping of the dust cleaning trolley; when the stepping shift block 15 reaches the front end of the tooth plate 2, the piston rod extends forward to push the stepping shift block 15 forward, and the limit plate 16 on the stepping shift block 15 is pressed by the limit plate on the rack The limit pin 1 blocks and drives the shift block to flip backward, so that the reverse shift tooth 14 is lifted, thus realizing the reversal of the step shift block 15; when the step shift block 15 changes direction, the cylinder 4 retracts and drives the step shift block 15 to move backward, and the limit plate 16 on the step shift block 15 is no longer blocked by the limit pin 1, and the step shift block 15 moves backward and rotates around the axis to slide over the teeth of the tooth plate 2 and enter the tooth groove at the rear. When the piston rod is extended, the end face of the shift tooth 14 of the step shift block 15 is against the tooth surface of the tooth plate 2, driving the cleaning trolley connected to the push-pull rod 7 to move a distance, and this cycle realizes the forward movement of the cleaning trolley; when it reaches the rear end of the tooth plate 2 and touches the limit pin 1, it flips again.

[0024] The key to the reversing of the stepping block 15 is that the limit plates 16 are fixed on both sides of the block, and the spacing is greater than the thickness of the rack. The limit pins 1 are fixed on both ends of the rack and extend longer than the outer surface spacing of the two limit plates 16. When the stepping block 15 rotates left and right within the rotation limit range, the bottom surface of the upper limit plate 16 of the stepping block 15 exceeds the arc surface of the upper limit pin 1 of the tooth plate 2. The shape, weight, center of gravity, rotation angle and rack tooth height of the stepping block 15 are specially designed. The stepping block 15 is a face-symmetrical design with the center of gravity within the symmetry plane. When the block deflects to the left or right, affected by gravity, the block will inevitably turn to the direction of the center of gravity. The rotation angle of the two-way conversion of the shifting teeth is greater than twice the maximum rotation angle when the block is stepping, so it can remain stable during operation and will not accidentally turn the block to the other end.

[0025] Optimally, the tooth plate 2 and the limit pin 1 are installed on the guide rail frame 10, and the driving components and the shift block support 5 and the parts installed on the shift block support 5 are installed on the frame of the trolley 9. When the cylinder 4 is started, the piston rod extends forward to drive the shifting tooth 14 of the stepping shift block 15 to fall into the front tooth groove, and the piston rod retracts, and the end face of the shifting tooth 14 of the stepping shift block 15 presses on the tooth surface of the tooth plate 2 connected to the guide rail frame 10, driving the frame of the trolley 9 connected to the cylinder 4 to move a certain distance. (Attached Figure 4 ) Optimally, the cylinder 4 can be a device with output linear motion, such as a hydraulic cylinder, an electric cylinder, etc.

[0026] Optimized, in order to make the stepping block 15 flip reliably, the side mounting screw of the block extends from the arc bar hole directly on the block and installs a tension spring, and the other end of the tension spring is fixed on the screw installed on the block. The characteristic is that the fixing point is farther than the center of the rotating shaft. When the block rotates in the opposite direction, the tension spring is stretched, thereby increasing the resistance to rotation and preventing accidental flipping and reversing.

[0027] Optimally, the toothed plate 2 and the toothed plate trolley 11 may be connected in other ways such as threading or riveting.

[0028] Optimized, because the equipment is entirely outside the flue, electrical components such as electrical travel switches can be installed as needed to collect information to accurately control the cylinder stroke and cleaning frequency.

[0029] Optimally, the tooth plate 2 can adopt double-sided teeth to increase utilization.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A step-by-step device for cleaning an air preheater, comprising a driving device, characterized in that: The driving device is connected with a shift block support, the shift block support is provided with a step shift block, the step shift block is provided with shift teeth, the shift teeth cooperate with a tooth plate, the tooth plate is fixed on the frame of the tooth plate trolley, and the driving device is arranged outside the flue.

2. The step-by-step device for cleaning the air preheater according to claim 1 is characterized in that: The shift block support includes a mounting plate, a wear-resistant sleeve is arranged on the mounting plate, a guide rod is arranged inside the wear-resistant sleeve, a track plate is also arranged on the mounting plate, a shift block shaft is arranged through the track plate, a shift block is arranged on the shift block shaft, a limit plate is arranged on the shift block, and the limit plate is installed on both sides of the tooth plate.

3. The step-by-step device for cleaning the air preheater according to claim 1 is characterized in that: The driving device is a cylinder, a piston rod is arranged in the cylinder, and the piston rod is connected to the stepping shifting block through a shifting block support.

4. The step-by-step device for cleaning the air preheater according to claim 1 is characterized in that: The driving device is fixed on a cylinder bracket, the cylinder bracket is fixed on a guide rail frame, and a guide rod is installed on the cylinder bracket.

5. The step-by-step device for cleaning the air preheater according to claim 1 is characterized in that: The toothed plate trolley is connected with a push-pull rod, and the push-pull rod is connected with a dust cleaning trolley.

6. The step-by-step device for cleaning the air preheater according to claim 5 is characterized in that: Support rollers are installed at the four corners of the frame of the toothed plate trolley, and the support rollers are arranged on the guide rails at the inner edge of the guide rail frame.

7. The step-by-step device for cleaning air preheater according to claim 1 is characterized in that: Limiting pins are fixed on both sides of the tooth plate, and the shifting teeth of the stepping shifting block are clamped in the tooth grooves of the tooth plate.

8. The step-by-step device for cleaning air preheater according to claim 1 is characterized in that: The driving device is fixed on a cylinder bracket, the cylinder bracket is fixed on a trolley, and a guide rod is installed on the cylinder bracket.

9. The step-by-step device for cleaning air preheater according to claim 1 is characterized in that: The tooth plate is fixed on the track frame, the trolley is connected with a push-pull rod, and the push-pull rod is connected with a dust cleaning trolley.

10. The step-by-step device for cleaning the air preheater according to claim 9, characterized in that: Support rollers are installed at the four corners of the frame of the trolley, and the support rollers are arranged on the guide rails at the inner edge of the guide rail frame.

Images