Self-cleaning tubular air pre-heater

Abstract

The invention discloses an air pre-heater, and particularly relates to a self-cleaning tubular air pre-heater which comprises a heat exchange tube box, a reinforced heat exchange tube is arranged on the heat exchange tube box, an ash removal trolley is arranged on the reinforced heat exchange tube, a supporting frame is arranged on the ash removal trolley, and a main shaft and a stepping type driving device are arranged on the supporting frame. The stepping type driving device works to drive the supporting frame to move along the reinforced heat exchange pipes, so that translation of the toothed plate assembly between the air pre-heater pipes can be achieved, and ash removal operation is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment, in particular to a self-cleaning tubular air preheater. Background Art

[0002] After the boiler has been used for a period of time, the inner side of the air preheater tube wall connected to it will be seriously stained with ash, which will hinder the passage of flue gas. The air in the air preheater cannot fully absorb the heat of the flue gas, causing the heat exchange effect of the air preheater to fail to meet the use requirements. Due to the serious ash accumulation on the air preheater tube wall, manual ash cleaning is difficult. If the air preheater is replaced, the cost is high and the production efficiency will be reduced. Therefore, the existing scheme is mostly to use a ash cleaning device to clean the air preheater. In the prior art, the contact ash cleaning equipment is mainly driven by a motor, and the driving mechanism pushes and pulls the ash cleaning element on the ash cleaning mechanism to move back and forth between the air preheater heat exchange tubes, squeezing and peeling off the ash accumulated on the heat exchange tubes. When the ash cleaning element is blocked by the ash accumulation between the heat exchange tubes and cannot operate, in order to prevent overload from causing damage to the motor or equipment, the ash cleaning device will enter a shutdown protection state. Another driving method is cylinder drive, but when the stroke of the ash cleaner is long, the cylinder guide rod directly drives the ash cleaner to move back and forth horizontally, which has high requirements on the cylinder stroke and insufficient stability. Summary of the invention

[0003] In order to solve the above problems in the prior art, the present invention provides a self-cleaning tubular air preheater to solve the current technical problems.

[0004] The technical solution adopted by the present invention to solve the technical problem is: The present invention provides a self-cleaning tubular air preheater, comprising: a heat exchange tube box, a track is arranged on the heat exchange tube box, a dust cleaning trolley is arranged on the track, a support frame is arranged on the dust cleaning trolley, a main shaft and a stepping drive device are arranged on the support frame, and a tooth plate is connected to the main shaft.

[0005] A self-cleaning tubular air preheater comprises: a heat exchange tube box, the heat exchange tube box comprises an upper heat exchange tube box and a lower heat exchange tube box, the lower heat exchange tube box is provided with a track, a dust cleaning trolley is provided on the track, a support frame is provided on the dust cleaning trolley, a main shaft and a stepping drive device are provided on the support frame, a tooth plate is connected to the main shaft, and the tooth plate comprises an upper tooth plate and a lower tooth plate.

[0006] Preferably, the track is a reinforced heat exchange tube.

[0007] Preferably, the heat exchange tube box is provided with a plurality of heat exchange tubes.

[0008] Preferably, the dust cleaning trolley is provided with wheels, the wheels are connected to the wheel frame plate through wheel axles, the wheel frame plate is connected to the clamping plate through pads, and the clamping plate is fixed to the support frame.

[0009] Preferably, the stepping drive device includes a first support plate, a square hole plate is arranged on the first support plate, a push-pull rod is connected to the square hole plate, a shift block seat is arranged on the push-pull rod, a stepping block is arranged in the middle of the shift block seat for relative rotation, connecting blocks are arranged on both sides of the shift block seat, groove blocks are arranged on the connecting blocks, the grooves of the groove blocks are embraced on the square hole plate, and the square hole plate has square holes arranged equidistantly.

[0010] Preferably, when the stepping block rotates left and right, the bottom plate of the block seat will block the teeth of the stepping block and limit the rotation range of the stepping block. The grooves of the slotted blocks on both sides of the block seat embrace the two sides of the square hole plate. The square hole plate is fixed to the upper part of the dust cleaning trolley by a connecting plate. There are limit blocks at both ends of the square hole plate. The limit blocks are arranged in the square holes at both ends of the square hole plate.

[0011] Preferably, the push-pull rod is connected to a guide rod, the guide rod passes through a sleeve, the sleeve is arranged at the rear end of a cylinder seat, a cylinder is arranged on the cylinder seat, the cylinder rod of the cylinder is fixedly connected to the guide rod, the shifting teeth of the step shifting block can be inserted into the square hole of the square hole plate, and a flip bump block is also arranged on the step shifting block.

[0012] Preferably, a first screw is provided on the stepping block, an arc-shaped through hole is provided on the block seat, the first screw passes through the through hole, a second screw is provided on the block seat, and a tension spring is connected between the first screw and the second screw.

[0013] The beneficial effect of the present invention is that the support frame can be driven to move along the reinforced heat exchange tube by the step-by-step driving device, so that the tooth plate assembly can be translated between the air preheater tubes to achieve the dust cleaning operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 2 1 is a structural schematic diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 3 1 is a structural schematic diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 4 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 5 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 6 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 7 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Figure 8 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig. 9 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.10 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.11 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.12 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.13 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.14 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.15 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.16 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.17 1 is a schematic structural diagram of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.18 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig.19 1 is a schematic structural diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention; Fig. 20 It is a structural schematic diagram of a partial structure of a self-cleaning tubular air preheater according to an embodiment of the present invention. Description of Reference Numerals

[0015] exist Figure 1-Figure 20Among them, cylinder 1-1; guide rod 1-2; cylinder seat 1-3; flange 1-4; push-pull rod 1-5; first support plate 1-6; limit block 1-7; square hole plate 1-8; square hole 1-9; groove block 1-10; connecting plate 1-11; stepping block 1-12; first screw 1-13; second screw 1-14; flipping block 1-15; shifting tooth 1-16; first rotating shaft 1-17; main shaft 2-1; support Support frame 2-8; dust cleaning trolley 2-17; tooth plate 2-18; upper tooth plate 2-18a; lower tooth plate 2-18b; tooth plate mounting seat 2-19; ​​connecting frame 2-22; wheel 3-1; wheel frame plate 3-2; anti-slip straight hanging plate 3-3; heat exchange tube 3-4; reinforced heat exchange tube 3-5; heat exchange tube box 3-6; upper heat exchange tube box 3-6a; lower heat exchange tube box 3-6b; front wall panel 3-7; rear wall panel 3-8. DETAILED DESCRIPTION

[0016] 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. Embodiment 1:

[0017] The present invention provides a self-cleaning tubular air preheater, as shown in the attached Figure 1 -Attached Fig.16 As shown, it includes a heat exchange tube box 3-6, and the front and rear ends of the heat exchange tube box 3-6 are fixedly connected by the front wall panel 3-7 and the rear wall panel 3-8 respectively. The heat exchange tube box 3-6 is provided with multiple heat exchange tubes 3-4, among which, there are two heat exchange tubes 3-4 on the top of the heat exchange box, which are reinforced heat exchange tubes 3-5, and their wall thickness can be 3 times to 5 times that of ordinary heat exchange tubes 3-4. Their appearance is the same as that of ordinary heat exchange tubes 3-4, and their installation method is also the same as that of ordinary heat exchange tubes 3-4. A dust cleaning trolley 2-17 is placed thereon, and a wheel 3-1 is provided on the dust cleaning trolley 2-17. The wheel 3-1 is pressed on the reinforced heat exchange tube 3-5, and the wheel 3-1 is connected to the wheel frame plate 3-2 through a wheel axle. The wheel frame plate 3-2 is connected to the card plate 2-4 through a gasket, and the card plate 2-4 is fixed to the support frame 2-8. The trolley is also connected with an anti-dropping straight hanging plate 3-3, which is sleeved on the reinforced heat exchange tube 3-5.

[0018] The support frame 2-8 includes several roots, with a connecting frame 2-22 connected in the middle. A main shaft 2-1 is arranged above the support frame 2-8, and a plurality of tooth plate assemblies are arranged at intervals on the main shaft 2-1. The support frame 2-8 can be driven to move along the reinforced heat exchange tube 3-5 by the step-by-step drive device, so that the tooth plate assembly can be translated between the air preheater tubes to achieve dust cleaning. At the same time, due to the setting of the upper and lower vibration parts, the tooth plate assembly can be driven to reciprocate up and down, so that the tooth plate can reciprocate from top to bottom in the gap between the heat exchange tubes 3-4, cut and shake off the sticky or hardened dust on the heat exchange tube 3-4, and clean the dust on the tube plates at both ends of the air preheater, thereby avoiding the problem of the tooth plate 2-18 stroke range being gradually compressed due to sticky dust accumulation, and achieving long-term stable dust cleaning.

[0019] The tooth plate assembly includes a tooth plate mounting seat 2-19 and a tooth plate 2-18. The tooth plate mounting seat 2-19 is fixedly connected to the main shaft 2-1, and the tooth plate 2-18 is fixedly connected to the tooth plate mounting seat 2-19. The tooth plate 2-18 has a self-cleaning function, and a cleaning sawtooth is provided on the tooth plate 2-18, and the sawtooth of the cleaning sawtooth on the tooth plate 2-18 faces away from the tooth plate mounting seat 2-19.

[0020] Composition of stepping drive device: The stepping drive device includes cylinder 1-1, cylinder seat 1-3, guide rod 1-2, push-pull rod 1-5, shift block seat, stepping shift block 1-12, and square hole plate 1-8. The driving components include cylinder 1-1, cylinder seat 1-3, guide rod 1-2, push-pull rod 1-5; the two-way conversion stepping mechanism includes shift block seat, stepping shift block 1-12, and square hole plate 1-8; The cylinder 1-1 is installed at the front end of the cylinder seat 1-3, the cylinder rod and the guide rod 1-2 are connected by threads, and the rear end of the guide rod 1-2 is provided with a connecting flange 1-4. The guide rod 1-2 passes through the shaft sleeve at the rear end of the cylinder seat 1-3 and is connected to the flange at the front end of the push-pull rod 1-5; a shift block seat is fixed at the other end of the push-pull rod 1-5, and the step shift block 1-12 is in the groove of the shift block seat. There are holes on both side walls of the groove, and a shaft is installed in the hole. The step shift block 1-12 can rotate left and right around the axis, and the bottom surface of the groove of the shift block seat contacts the end surface of the shift tooth 1-16 to limit the rotation range of the step shift block 1-12. There are connecting blocks 1-11 on both sides of the shift block seat, and the groove block 1-10 is installed in the upper groove of the connecting block 1-11. The groove of the groove block 1-10 hugs the edge of the square hole plate 1-8. There are connecting plates at both ends of the square hole plate 1-8. The connecting plates are fixed on the frame of the cleaning trolley 2-17. There are square holes 1-9 arranged equidistantly on the square hole plate 1-8. There are limit blocks 1-7 at both ends of the square hole plate 1-8. The limit blocks 1-7 are set in the notches at both ends of the square hole plate 1-8; the shifting teeth 1-16 of the stepping block 1-12 are inserted into the square holes 1-9 of the square hole plate 1-8.

[0021] Principle of the stepping drive device: When the cylinder rod extends forward, it pushes the stepping block 1-12 forward. The stepping block 1-12 is blocked by the rear edge of the square hole 1-9 and rotates around the axis to disengage from the square hole 1-9, and slides along the lower surface of the square hole plate 1-8 into the front square hole 1-9; the cylinder rod retracts to pull the stepping block 1-12, and the end face of the tooth 1-16 of the stepping block 1-12 presses against the front surface of the square hole 1-9, driving the cleaning trolley 2-17 to step a certain distance in the retraction direction of the cylinder 1-1, and the cleaning trolley 2-17 is stepped in this cycle; when the stepping block 1-12 reaches the front end of the square hole plate 1-8, the cylinder rod extends forward to push the stepping block 1-12 forward, and the flipping block 1-15 on the stepping block 1-12 is The limit block 1-7 blocks and drives the shift block to flip backward, so that the reverse shift tooth 1-16 is lifted, thus realizing the reversal of the stepping shift block 1-12; after the stepping shift block 1-12 is reversed, the cylinder 1-1 retracts and drives the stepping shift block 1-12 to move backward, and the flipping block 1-15 is not blocked by the limit block 1-7. The stepping shift block 1-12 moves backward and rotates around the axis and slides along the lower surface of the square hole plate 1-8 into the rear square hole 1-9. The cylinder rod extends to push the stepping shift block 1-12, and the end face of the shift tooth 1-16 of the stepping shift block 1-12 presses against the rear surface of the square hole 1-9, driving the cleaning trolley to step a certain distance in the direction of the cylinder 1-1 extension, and the cleaning trolley is stepped in this cycle; it reaches the rear end of the square hole plate 1-8 and then flips. The length of the stepping distance = the spacing between square holes 1-9, the cylinder stroke = the spacing between square holes 1-9 + the cylinder stroke margin, and the margin is generally 5~10mm.

[0022] The key to the reversing of the stepping block 1-12 is that the bump block should be in the middle of the connecting surface of the two teeth 1-16. When the block is upright, the height of the bump block should be lower than the limit block 1-7. When the block slides along the bottom surface, the height of the bump block should be higher than the limit block 1-7 to achieve the reversing direction. The shape, weight, center of gravity and rotation angle of the stepping block 1-12 are specially designed. The block is designed to be face-symmetrical, and the center of gravity is in the symmetry plane. When the block deflects to the left or right, it will be affected by gravity and will inevitably turn to the direction of the center of gravity. The rotation angle is greater than 2 times the maximum rotation angle of the block when stepping, so it can remain stable during work and will not accidentally turn the block to the other end. The center of gravity is as close to the center of rotation as possible, and the weight is reduced as much as possible to reduce the torque required for the block to turn.

[0023] Optimized, in order to make the shift block flip reliably, a first screw 1-13 is installed on the side of the shift block, extending from the arc-shaped long hole of the shift block seat and installed with a tension spring, and the other end of the tension spring is fixed to the second screw 1-14 on the shift block seat. The characteristic is that the fixed point is farther than the center of the first rotating shaft 1-17. When the shift block rotates in the opposite direction, the tension spring is stretched, thereby increasing the resistance to rotation and preventing accidental flipping and reversing.

[0024] Optimally, the groove block 1-10 is made of wear-resistant material and can also be replaced by rollers arranged up and down to reduce resistance and limit other guiding and supporting structures running along the edge of the square hole plate 1-8.

[0025] Optimally, the cylinder 1-1 can be replaced by a device with output linear motion, such as a hydraulic cylinder, an electric cylinder, etc.

[0026] The present application uses a system composed of a block seat, a block, a square hole plate 1-8, and a guide support for cleaning, which can achieve a cleaning distance of any length when the stroke of the cylinder 1-1 is very short, and has a good use effect. In addition, the device occupies little space outside the furnace and has better adaptability. Embodiment 2:

[0027] The present invention provides a self-cleaning tubular air preheater, as shown in the attached Figure 6 -Attached Fig. 20 As shown, it includes a heat exchange tube box 3-6, and the heat exchange tube box 3-6 includes an upper heat exchange tube box 3-6a and a lower heat exchange tube box 3-6b. The front and rear ends of the upper heat exchange tube box 3-6a and the lower heat exchange tube box 3-6b are fixedly connected by a front wall plate 3-7 and a rear wall plate 3-8 respectively. The upper heat exchange tube box 3-6a and the lower heat exchange tube box 3-6b are provided with a plurality of heat exchange tubes 3-4. There is an installation height gap between the upper heat exchange tube box 3-6a and the lower heat exchange tube box 3-6b, and a dust cleaning trolley 2-17 is provided between the upper heat exchange tube box 3-6a and the lower heat exchange tube box 3-6b. Among them, there are two heat exchange tubes 3-4 on the top of the lower heat exchange tube box 3-6b, which are reinforced heat exchange tubes 3-5, and their wall thickness can be 3-5 times that of ordinary heat exchange tubes 3-4. Their appearance is the same as that of ordinary heat exchange tubes 3-4, and their installation method is also the same as that of ordinary heat exchange tubes 3-4. A dust cleaning trolley 2-17 is placed on it, and a wheel 3-1 is provided on the dust cleaning trolley 2-17. The wheel 3-1 rolls on the reinforced heat exchange tube 3-5. The wheel 3-1 is connected to the wheel frame plate 3-2 through the wheel axle, and the wheel frame plate 3-2 is connected to the card plate 2-4 through the pad, and the card plate 2-4 is fixed to the support frame 2-8. The trolley is also connected to an anti-slip straight hanging plate 3-3, and the anti-slip straight hanging plate 3-3 is sleeved on the reinforced heat exchange tube 3-5.

[0028] The support frame 2-8 is connected to the connecting frame 2-22. A main shaft 2-1 is provided above the support frame 2-8. A plurality of tooth plate assemblies are provided on the main shaft 2-1 at intervals. The support frame 2-8 can be driven to move along the reinforced heat exchange tube 3-5 by the step-by-step drive device, so that the tooth plate assembly can be translated between the air preheater tubes to achieve dust cleaning. At the same time, due to the setting of the upper and lower vibration parts, the tooth plate assembly can be driven to reciprocate up and down, so that the tooth plate can reciprocate from top to bottom in the gap between the heat exchange tubes 3-4, cut and shake off the sticky or hardened dust on the heat exchange tubes 3-4, and clean the dust on the tube plates at both ends of the air preheater, thereby avoiding the problem of the tooth plate 2-18 stroke range being gradually compressed due to sticky dust accumulation, and achieving long-term stable dust cleaning.

[0029] The tooth plate assembly includes a tooth plate mounting seat 2-19, an upper tooth plate 2-18a and a lower tooth plate 2-18b. The tooth plate mounting seat 2-19 is fixedly connected to the main shaft 2-1, the upper tooth plate 2-18a is fixedly connected to the tooth plate mounting seat 2-19, and the lower tooth plate 2-18b is fixedly connected to the tooth plate mounting seat 2-19. The upper tooth plate 2-18a and the lower tooth plate 2-18b have a self-cleaning function, and cleaning serrations are provided on the upper tooth plate 2-18a and the lower tooth plate 2-18b. The serrations of the cleaning serrations on the upper tooth plate 2-18a face the tooth plate mounting seat 2-19, and the serrations of the cleaning serrations on the lower tooth plate 2-18b face away from the tooth plate mounting seat 2-19.

[0030] Composition of stepping drive device: The stepping drive device includes cylinder 1-1, cylinder seat 1-3, guide rod 1-2, push-pull rod 1-5, shift block seat, stepping shift block 1-12, and square hole plate 1-8. The driving components include cylinder 1-1, cylinder seat 1-3, guide rod 1-2, push-pull rod 1-5; the two-way conversion stepping mechanism includes shift block seat, stepping shift block 1-12, and square hole plate 1-8; The cylinder 1-1 is installed at the front end of the cylinder seat 1-3, the cylinder rod and the guide rod 1-2 are connected by threads, and the rear end of the guide rod 1-2 is provided with a connecting flange 1-4. The guide rod 1-2 passes through the shaft sleeve at the rear end of the cylinder seat 1-3 and is connected to the flange at the front end of the push-pull rod 1-5; a shift block seat is fixed at the other end of the push-pull rod 1-5, and the step shift block 1-12 is in the groove of the shift block seat. There are holes on both side walls of the groove, and a shaft is installed in the hole. The step shift block 1-12 can rotate left and right around the axis, and the bottom surface of the groove of the shift block seat contacts the end surface of the shift tooth 1-16 to limit the rotation range of the step shift block 1-12. There are connecting blocks 1-11 on both sides of the shift block seat, and the groove block 1-10 is installed in the upper groove of the connecting block 1-11. The groove of the groove block 1-10 hugs the edge of the square hole plate 1-8. There are connecting plates at both ends of the square hole plate 1-8. The connecting plates are fixed on the frame of the cleaning trolley 2-17. There are square holes 1-9 arranged equidistantly on the square hole plate 1-8. There are limit blocks 1-7 at both ends of the square hole plate 1-8. The limit blocks 1-7 are set in the notches at both ends of the square hole plate 1-8; the shifting teeth 1-16 of the stepping block 1-12 are inserted into the square holes 1-9 of the square hole plate 1-8.

[0031] Principle of the stepping drive device: When the cylinder rod extends forward, it pushes the stepping block 1-12 forward. The stepping block 1-12 is blocked by the rear edge of the square hole 1-9 and rotates around the axis to disengage from the square hole 1-9, and slides along the lower surface of the square hole plate 1-8 into the front square hole 1-9; the cylinder rod retracts to pull the stepping block 1-12, and the end face of the tooth 1-16 of the stepping block 1-12 presses against the front surface of the square hole 1-9, driving the cleaning trolley 2-17 to step a certain distance in the retraction direction of the cylinder 1-1, and the cleaning trolley 2-17 is stepped in this cycle; when the stepping block 1-12 reaches the front end of the square hole plate 1-8, the cylinder rod extends forward to push the stepping block 1-12 forward, and the flipping block 1-15 on the stepping block 1-12 is The limit block 1-7 blocks and drives the shift block to flip backward, so that the reverse shift tooth 1-16 is lifted, thus realizing the reversal of the stepping shift block 1-12; after the stepping shift block 1-12 is reversed, the cylinder 1-1 retracts and drives the stepping shift block 1-12 to move backward, and the flipping block 1-15 is not blocked by the limit block 1-7. The stepping shift block 1-12 moves backward and rotates around the axis and slides along the lower surface of the square hole plate 1-8 into the rear square hole 1-9. The cylinder rod extends to push the stepping shift block 1-12, and the end face of the shift tooth 1-16 of the stepping shift block 1-12 presses against the rear surface of the square hole 1-9, driving the cleaning trolley to step a certain distance in the direction of the cylinder 1-1 extension, and the cleaning trolley is stepped in this cycle; it reaches the rear end of the square hole plate 1-8 and then flips. The length of the stepping distance = the spacing between square holes 1-9, the cylinder stroke = the spacing between square holes 1-9 + the cylinder stroke margin, and the margin is generally 5~10mm.

[0032] The key to the reversing of the stepping block 1-12 is that the bump block should be in the middle of the connecting surface of the two teeth 1-16. When the block is upright, the height of the bump block should be lower than the limit block 1-7. When the block slides along the bottom surface, the height of the bump block should be higher than the limit block 1-7 to achieve the reversing direction. The shape, weight, center of gravity and rotation angle of the stepping block 1-12 are specially designed. The block is designed to be face-symmetrical, and the center of gravity is in the symmetry plane. When the block deflects to the left or right, it will be affected by gravity and will inevitably turn to the direction of the center of gravity. The rotation angle is greater than 2 times the maximum rotation angle of the block when stepping, so it can remain stable during work and will not accidentally turn the block to the other end. The center of gravity is as close to the center of rotation as possible, and the weight is reduced as much as possible to reduce the torque required for the block to turn.

[0033] Optimized, in order to make the shift block flip reliably, a first screw 1-13 is installed on the side of the shift block, extending from the arc-shaped long hole of the shift block seat and installed with a tension spring, and the other end of the tension spring is fixed to the second screw 1-14 on the shift block seat. The characteristic is that the fixed point is farther than the center of the first rotating shaft 1-17. When the shift block rotates in the opposite direction, the tension spring is stretched, thereby increasing the resistance to rotation and preventing accidental flipping and reversing.

[0034] Optimally, the groove block 1-10 is made of wear-resistant material and can also be replaced by rollers arranged up and down to reduce resistance and limit other guiding and supporting structures running along the edge of the square hole plate 1-8.

[0035] Optimally, the cylinder 1-1 can be replaced by a device with output linear motion, such as a hydraulic cylinder, an electric cylinder, etc.

[0036] 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 self-cleaning tubular air preheater, comprising: The heat exchange tube box is characterized in that: a track is arranged on the heat exchange tube box, a dust cleaning trolley is arranged on the track, a support frame is arranged on the dust cleaning trolley, a main shaft and a stepping drive device are arranged on the support frame, and a tooth plate is connected to the main shaft.

2. A self-cleaning tubular air preheater, comprising: The heat exchange tube box is characterized in that: the heat exchange tube box comprises an upper heat exchange tube box and a lower heat exchange tube box, the lower heat exchange tube box is provided with a track, a dust cleaning trolley is provided on the track, a support frame is provided on the dust cleaning trolley, a main shaft and a stepping drive device are provided on the support frame, a tooth plate is connected to the main shaft, and the tooth plate comprises an upper tooth plate and a lower tooth plate.

3. The self-cleaning tubular air preheater according to claim 1, characterized in that: The track is a reinforced heat exchange tube.

4. The self-cleaning tubular air preheater according to claim 1, characterized in that: The heat exchange tube box is provided with a plurality of heat exchange tubes.

5. The self-cleaning tubular air preheater according to claim 1, characterized in that: The dust cleaning trolley is provided with wheels, the wheels are connected to the wheel frame plate through wheel axles, the wheel frame plate is connected to the clamping plate through pads, and the clamping plate is fixed on the supporting frame.

6. The self-cleaning tubular air preheater according to claim 1, characterized in that: The stepping drive device includes a first support plate, a square hole plate is arranged on the first support plate, a push-pull rod is connected to the square hole plate, a shift block seat is arranged on the push-pull rod, a step shift block is arranged in the middle of the shift block seat for relative rotation, connecting blocks are arranged on both sides of the shift block seat, groove blocks are arranged on the connecting blocks, the grooves of the groove blocks are embraced on the square hole plate, and the square hole plate has square holes arranged equidistantly.

7. The self-cleaning tubular air preheater according to claim 6, characterized in that: When the stepping block rotates left and right, the bottom plate of the block seat will block the teeth of the stepping block and limit the rotation range of the stepping block. The grooves of the groove blocks on both sides of the block seat embrace the two sides of the square hole plate. The square hole plate is fixed to the upper part of the dust cleaning trolley by a connecting plate. There are limit blocks at both ends of the square hole plate. The limit blocks are set in the square holes at both ends of the square hole plate.

8. The self-cleaning tubular air preheater according to claim 7, characterized in that: The push-pull rod is connected to a guide rod, the guide rod passes through a sleeve, the sleeve is arranged at the rear end of a cylinder seat, a cylinder is arranged on the cylinder seat, the cylinder rod of the cylinder is fixedly connected to the guide rod, the shifting teeth of the step shifting block can be inserted into the square hole of the square hole plate, and a flip bump block is also arranged on the step shifting block.

9. The self-cleaning tubular air preheater according to claim 7, characterized in that: The stepping block is provided with a first screw, the block seat is provided with an arc-shaped through hole, the first screw passes through the through hole, the block seat is provided with a second screw, and a tension spring is connected between the first screw and the second screw.

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