A sludge disposal system for urban sewage treatment plants

Abstract

The present invention relates to the field of sludge disposal, specifically a sludge disposal system for a town sewage plant, comprising a cylinder and a feed pipe connected to the upper end of the cylinder, a hollow shaft is rotatably connected to the inner wall of the middle part of the upper end of the cylinder, and four furnace bed layers are fixedly connected to the inner wall of the cylinder from top to bottom in sequence, and an arc-shaped scraper can be rotated in accordance with the hole groove wall of the first furnace bed layer to scrape off the sludge attached to the hole groove of the furnace bed layer, and at the same time, multiple rake teeth 1 can be synchronously rotated ninety degrees and form a closure, and then multiple rake teeth 1 switch angles to comprehensively scrape off the sludge on the surface of the furnace bed layer, so as to avoid that the single angle of the rake teeth 1 cannot completely scrape off the sludge on the surface of the furnace bed layer. Therefore, the inner side and upper surface of the furnace bed layer are cleaned, avoiding affecting the performance of the multi-chamber rake furnace. The intermittent opening and closing can be controlled by an electric valve, so that not only the side of the rake teeth 1 is effectively cleaned by the airflow, but also the heat can be discharged to the outside.

Description

Technical Field

[0001] The invention relates to the field of sludge disposal, in particular to a sludge disposal system for a municipal sewage plant. Background Art

[0002] With the rapid development of my country's economy and society, the scale of urban domestic sewage treatment has increased year by year. As the main by-product of sewage treatment, the generation and treatment volume of sludge has also increased accordingly.

[0003] At present, the main methods of sludge treatment and disposal include landfill, incineration, anaerobic digestion, aerobic composting, drying and pyrolysis, etc. Among them, sludge pyrolysis technology has attracted extensive attention at home and abroad in recent years due to its outstanding harmlessness and resource advantages. Sludge pyrolysis technology is to use anaerobic or anoxic treatment at a higher temperature to make the organic matter in the sludge undergo thermal cracking and thermochemical conversion reactions, turning the sludge into pyrolysis gas, bio-oil and pyrolysis carbon products with utilization value.

[0004] In the process of sludge pyrolysis, multi-chamber rake furnaces are often used. The outer layer of the multi-chamber rake furnace is made of carbon steel, and the internal structure of the furnace body is built with special-shaped refractory bricks using self-supporting small-angle micro-arch masonry. The center of the furnace is penetrated by a rotatable central axis, and the central axis is connected to a rake arm, and the rake arm is attached with rake teeth. When the rake arm is driven by the rotation of the central axis, the rake teeth contact the material layer to push the material layer apart and evenly distribute it on the furnace bed. The angle adjustment of the rake teeth can make the material move toward the center or to the wall on the furnace bed. After the sludge is fed from the top of the furnace body, it is evenly distributed on the surface of the furnace bed under the rotating raking of the rake arm. The rake teeth rake the material layer again and again to increase the contact area between the material layer and the higher temperature gas to promote the heat energy transfer and mass transfer rate. The discharge port of the multi-chamber rake furnace is designed with alternating central discharge and wall side discharge, so that the material can have the best furnace bed utilization efficiency in the furnace. The solid moves from top to bottom in the furnace and undergoes drying, pyrolysis and carbonization processes, and the high-temperature gas generated in the process is discharged from the furnace top from bottom to top. This up and down flow process effectively utilizes the thermal energy of the high-temperature gas, and uses its own gas thermal energy for drying in the drying section.

[0005] However, although the furnace body can dry the sludge, the sludge that has just entered the furnace body and stayed on the first furnace bed still has a high humidity. At this time, when the rake teeth above the first furnace bed move the sludge, more sludge will easily adhere to the surface of the rake teeth, and more sludge will also easily adhere to the surface of the first furnace bed. In the process of heating the sludge by the furnace body, the sludge adhered to the surface of the rake teeth and the surface of the first furnace bed will dry and form adhesion, which will affect the performance of the multi-chamber rake furnace. For this reason, we propose a sludge disposal system for urban sewage treatment plants. Summary of the invention

[0006] The object of the present invention is to provide a sludge disposal system for a municipal sewage plant to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sludge disposal system for a municipal sewage treatment plant, comprising a cylinder and a feed pipe connected to the upper end of the cylinder, a hollow shaft is rotatably connected to the inner wall of the middle part of the upper end of the cylinder, four furnace bed layers are fixedly connected to the inner wall of the cylinder in sequence from top to bottom, a driving mechanism is provided between the hollow shaft and the cylinder, a blowing mechanism is provided at the lower end of the cylinder, an exhaust mechanism is provided on the outer wall of the hollow shaft, four groups of cylinders 1 are fixedly connected to the outer wall of the hollow shaft in a linear array from top to bottom, the number of cylinders 1 in each group is four, cylinders 2 are fixedly connected to the inner sides of sixteen cylinders 1, the four cylinders 2 at the top are provided with a material shifting mechanism, the four cylinders 2 at the top are provided with an air jet mechanism at the bottom of the outer wall, and the other twelve cylinders 2 are fixedly connected to a group of rake teeth 2 at the bottom of the outer wall in a linear array.

[0008] Preferably, the driving mechanism includes a first motor and a second gear. The first motor is fixedly installed on the top of the cylinder through a mounting base. The output shaft end of the first motor is fixedly connected to the first gear. The second gear is fixedly sleeved on the outer wall of the hollow shaft corresponding to the first gear, and the first gear and the second gear are meshed with each other.

[0009] Preferably, the hair blowing mechanism comprises a support frame, the support frame is fixedly connected to the lower end of the cylinder, a cold air blower is fixedly connected to the middle of the support frame, and an air outlet end of the cold air blower is rotatably connected to the bottom end of the hollow shaft.

[0010] Preferably, the exhaust mechanism includes an air outlet pipe 1, the air outlet pipe 1 is connected to the outer wall of the hollow shaft near the upper edge, and an electric valve is installed on the air outlet pipe 1.

[0011] Preferably, the material-moving mechanism comprises four fixed plates, which are respectively fixedly connected to the inner walls of the four cylinders two, the lower ends of the four fixed plates are rotatably connected to a group of rotating columns, the four groups of rotating columns are respectively movable through the four cylinders two, the bottom ends of the four groups of rotating columns are respectively fixedly connected to rake teeth one, the upper edges of the outer walls of the four groups of rotating columns are fixedly sleeved with connecting rods five, the ends of the four groups of connecting rods five away from the rotating columns are rotatably connected to connecting rods four, and a transmission mechanism is provided between the four connecting rods four and the hollow shaft.

[0012] Preferably, the transmission mechanism comprises a heat insulation layer, a second motor, four sliding blocks and four supporting blocks, the second motor is fixedly mounted on the top of the hollow shaft, the output shaft end of the second motor is fixedly connected to a rotating rod, the bottom end of the rotating rod is fixedly connected to the first bevel gear, the four sliding blocks are respectively slidably arranged on the inner walls of the four cylinders two, the middle parts of the inner walls of the four sliding blocks are penetrated and tightened with threaded rods, one end of the four threaded rods corresponding to the axis line of the hollow shaft is fixedly connected to the second bevel gear, the four second bevel gears are meshed with the first bevel gear, the four supporting blocks are respectively fixedly connected to one end of the four cylinders one corresponding to the axis line of the hollow shaft, the four threaded rods respectively penetrate and are rotatably connected in the inner walls of the four supporting blocks, the ends of the four sliding blocks away from the first bevel gear are fixedly connected to the connecting rod two, the ends of the four connecting rods two away from the sliding block are respectively rotatably connected to the four connecting rods four with connecting rod three, and the heat insulation layer is fixedly connected to the upper edge of the inner wall of the hollow shaft.

[0013] Preferably, the inner wall of the sliding block is symmetrically slidably interspersed with limit rods, and the two limit rods are fixedly connected to the inner wall of the second cylinder.

[0014] Preferably, the jet mechanism comprises a plurality of air outlet pipes 2, the plurality of air outlet pipes 2 are linearly arrayed and connected to the bottom of the outer wall of the cylinder 2, the inner walls of the plurality of air outlet pipes 2 are fixedly connected with a fixed ring near the upper edge, the outer walls of the plurality of air outlet pipes 2 are symmetrically connected with an inclined jet pipe, the inner bottom ends of the plurality of air outlet pipes 2 are fixedly connected with a sleeve, the interiors of the plurality of sleeves are slidably inserted with a fixed rod, the upper ends of the plurality of fixed rods are fixedly connected with a rubber plug, the outer walls of the plurality of rubber plugs are respectively attached to the inner ring surfaces of the plurality of fixed rings, the lower ends of the plurality of rubber plugs are respectively fixedly connected with a spring to the upper ends of the plurality of sleeves, and the plurality of springs are respectively slidably sleeved on the outer walls of the plurality of fixed rods.

[0015] Preferably, a disc is fixedly sleeved on the outer wall of the hollow shaft, a connecting rod 1 is symmetrically fixedly connected to the bottom of the disc, two ends of the connecting rod 1 away from the disc are fixedly connected to arc scrapers, and the two arc scrapers are both attached to the inner annular surface of the furnace bed layer located at the top.

[0016] Preferably, the bottom of the cylinder and the furnace bed layer located below are both provided with discharge ports, and the two discharge ports are interconnected.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the cooperation between the material-dispensing mechanism and the arc-shaped scraper, the arc-shaped scraper can rotate in close contact with the hole groove wall of the first furnace bed layer, and can scrape off the sludge attached to the hole groove of the furnace bed layer. At the same time, multiple rake teeth can rotate 90 degrees synchronously and form a closed state, and then multiple rake teeth switch angles to completely scrape off the sludge on the surface of the furnace bed layer, so as to avoid the situation that the single angle of the rake teeth cannot completely scrape off the sludge on the surface of the furnace bed layer. Therefore, the inner side and upper surface of the furnace bed layer are cleaned, avoiding affecting the performance of the multi-chamber rake furnace.

[0019] 2. Through the cooperation of the jet mechanism, the blower mechanism and the exhaust mechanism, and the intermittent opening and closing can be controlled by the electric valve, not only the side of the rake teeth can be effectively cleaned by the airflow, but also the heat can be discharged to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic cross-sectional view of the cylinder of the present invention;

[0022] Figure 3 It is a cross-sectional schematic diagram of a hollow shaft of the present invention;

[0023] Figure 4 It is a schematic diagram of the position relationship between the hollow shaft and the disc of the present invention;

[0024] Figure 5 It is a schematic diagram of the positional relationship between the first bevel gear and the second bevel gear of the present invention;

[0025] Figure 6 It is a schematic diagram of the position relationship between the sliding block and the connecting rod of the present invention;

[0026] Figure 7 It is a schematic cross-sectional view of a cylinder according to the present invention;

[0027] Figure 8 For the present invention Figure 7 A schematic diagram of the structure enlargement in the middle;

[0028] Fig. 9 It is a schematic diagram of the position relationship between the rotating column and the rake teeth of the present invention;

[0029] Fig.10 For the present invention Fig. 9 A magnified schematic diagram of the structure at B in the middle;

[0030] Fig.11 For the present invention Fig. 9 Enlarged schematic diagram of the structure at point C in the middle.

[0031] In the attached drawings, the parts represented by the reference numerals are as follows: 1. support frame; 2. cylinder; 3. feed pipe; 4. first motor; 5. first gear; 6. air cooler; 7. hollow shaft; 8. second motor; 9. second gear; 10. outlet pipe 1; 11. electric valve; 12. rotating rod; 13. heat insulation layer; 14. cylinder 1; 15. cylinder 2; 16. disc; 17. connecting rod 1; 18. arc scraper; 19. first bevel gear; 20. second Bevel gear; 21. Threaded rod; 22. Limit rod; 23. Sliding block; 24. Connecting rod 2; 25. Connecting rod 3; 26. Connecting rod 4; 27. Fixed plate; 28. Connecting rod 5; 29. ​​Rotating column; 30. Rake tooth 1; 31. Exhaust pipe 2; 32. Injection pipe; 33. Fixed ring; 34. Rubber plug; 35. Fixed rod; 36. Spring; 37. Sleeve; 38. Hearth layer; 39. Discharge port; 40. Rake tooth 2; 41. Support block. DETAILED DESCRIPTION

[0032] 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.

[0033] Embodiment 1

[0034] See also Figure 1 - Fig.11 The figure shows a sludge disposal system for a town sewage plant, comprising a cylinder 2 and a feed pipe 3 connected to the upper end of the cylinder 2. A hollow shaft 7 is rotatably connected to the inner wall of the middle part of the upper end of the cylinder 2. Four furnace bed layers 38 are fixedly connected to the inner wall of the cylinder 2 in sequence from top to bottom. A driving mechanism is provided between the hollow shaft 7 and the cylinder 2. A blower mechanism is provided at the lower end of the cylinder 2. An exhaust mechanism is provided on the outer wall of the hollow shaft 7. Four groups of cylinders 14 are fixedly connected to the outer wall of the hollow shaft 7 in a linear array from top to bottom. The number of cylinders 14 in each group is four. Cylinders 2 15 are fixedly connected to the inner sides of the sixteen cylinders 14. The four cylinders 2 15 located at the top are provided with a material shifting mechanism. The bottom of the outer wall of the four cylinders 2 15 located at the top are provided with an air jet mechanism. The bottom of the outer wall of the other twelve cylinders 2 15 are fixedly connected to a group of rake teeth 2 40 in a linear array.

[0035] Specifically, the centers of the first furnace bed layer 38 and the third furnace bed layer 38 from top to bottom are both provided with holes and grooves, and the outer wall of the second furnace bed layer 38 is provided with a plurality of arc-shaped notches in a circular array. When the rake teeth 1 30 above the first furnace bed layer 38 and the rake teeth 2 40 above the third furnace bed layer 38 rotate, the angle setting thereof can push the sludge on the upper surface of the first furnace bed layer 38 and the third furnace bed layer 38 to the holes and grooves to fall, and when the rake teeth 2 40 above the second furnace bed layer 38 rotate, the angle setting thereof can push the sludge on the upper surface of the second furnace bed layer 38 to the plurality of arc-shaped notches to fall. The furnace bed layer 38 is made of high temperature resistant bricks. The inner cavity of the cylinder 2 is heated from the bottom of the cavity by an external heating device.

[0036] The driving mechanism includes a first motor 4 and a second gear 9. The first motor 4 is fixedly installed above the cylinder 2 through a mounting base. The output shaft end of the first motor 4 is fixedly connected to the first gear 5. The second gear 9 is fixedly sleeved on the outer wall of the hollow shaft 7 corresponding to the first gear 5. The first gear 5 and the second gear 9 are meshed with each other.

[0037] The hair dryer mechanism comprises a support frame 1 which is fixedly connected to the lower end of the barrel 2 , a cold air blower 6 is fixedly connected to the middle of the support frame 1 , and an air outlet end of the cold air blower 6 is rotatably connected to the bottom end of the hollow shaft 7 .

[0038] The exhaust mechanism includes an air outlet pipe 10, which is connected to the outer wall of the hollow shaft 7 near the upper edge, and an electric valve 11 is installed on the air outlet pipe 10.

[0039] Specifically, the cold air can be delivered to the inside of the hollow shaft 7 by starting the cold air blower 6, so as to provide cooling protection for the hollow shaft 7 and the cylinder 15, and the electric valve 11 is opened, so that the cold air flow will finally be discharged to the outside along the outlet pipe 10.

[0040] The material-dispensing mechanism includes four fixed plates 27, which are fixedly connected to the inner walls of the four cylinders 15, respectively. The lower ends of the four fixed plates 27 are rotatably connected to a group of rotating columns 29 (such as Fig.10 As shown, four groups of rotating columns 29 are respectively movable and penetrate the four cylinders 2 15, the bottom ends of the four groups of rotating columns 29 are fixedly connected with rake teeth 1 30, the upper edges of the outer walls of the four groups of rotating columns 29 are fixedly sleeved with connecting rods 5 28, the ends of the four groups of connecting rods 5 28 away from the rotating columns 29 are rotatably connected with connecting rods 4 26, and a transmission mechanism is provided between the four connecting rods 4 26 and the hollow shaft 7.

[0041] The transmission mechanism includes an insulation layer 13, a second motor 8, four sliding blocks 23 and four supporting blocks 41. The second motor 8 is fixedly installed on the top of the hollow shaft 7. The output shaft end of the second motor 8 is fixedly connected to the rotating rod 12. The bottom end of the rotating rod 12 is fixedly connected to the first bevel gear 19. The four sliding blocks 23 are respectively slidably arranged on the inner walls of the four cylinders 15. The middle parts of the inner walls of the four sliding blocks 23 are all penetrated and tightened with threaded rods 21. The ends of the four threaded rods 21 corresponding to the axis of the hollow shaft 7 are fixedly connected to the second bevel gear 20. The four second bevel gears 20 are all meshed with the first bevel gear 19. The four supporting blocks 41 are respectively fixedly connected to the ends of the four cylinders 14 corresponding to the axis of the hollow shaft 7. The four threaded rods 21 are respectively penetrated and rotatably connected in the inner walls of the four supporting blocks 41 (such as Figure 5 As shown), one end of the four sliding blocks 23 away from the first bevel gear 19 is fixedly connected to a connecting rod 24, and one end of the four connecting rods 24 away from the sliding blocks 23 is rotatably connected to the four connecting rods 4 26 respectively, and a connecting rod 3 25 is connected thereto (as shown in FIG. Figure 8 As shown), the heat insulation layer 13 is fixedly connected to the upper edge of the inner wall of the hollow shaft 7.

[0042] Specifically, the heat insulation layer 13 is made of polystyrene foam board to prevent the second motor 8 from being affected by excessively high temperature.

[0043] The inner wall of the sliding block 23 is symmetrically slidably interlaced with the limiting rods 22 , and the two limiting rods 22 are fixedly connected to the inner wall of the second cylinder 15 .

[0044] The outer wall of the hollow shaft 7 is fixedly sleeved with a disc 16, and the bottom of the disc 16 is symmetrically fixedly connected with a connecting rod 17. The ends of the two connecting rods 17 away from the disc 16 are fixedly connected with arc scrapers 18, and the two arc scrapers 18 are both attached to the inner annular surface of the furnace bed layer 38 located at the top.

[0045] The bottom of the cylinder 2 and the furnace bed layer 38 located below are both provided with discharge ports 39 , and the two discharge ports 39 are interconnected.

[0046] In this embodiment, the staff transfers the sludge to the upper surface of the first furnace bed layer 38 through the feed pipe 3, and then starts to heat the inner cavity of the cylinder 2 through the existing external heating device, so that the sludge begins to be heated for pyrolysis treatment of the sludge, and at the same time, the first motor 4 is energized to drive the first gear 5 to start rotating, and the first gear 5 drives the second gear 9 meshing therewith to rotate, and the rotation of the second gear 9 drives the hollow shaft 7 to rotate synchronously. At this time, the hollow shaft 7 drives the cylinder 14 to rotate synchronously, and at the same time, the hollow shaft 7 drives the disc 16 to rotate synchronously. Therefore, the disc 16 drives the connecting rod 17 to rotate with the center of the disc 16 as the axis, the disc 16 drives the connecting rod 17 to rotate, and the connecting rod 17 drives the arc scraper 18 to rotate in contact with the hole groove wall of the first furnace bed layer 38. Since the sludge just put into the inner cavity of the cylinder 2 is relatively wet, when the sludge passes through the holes and grooves of the furnace bed layer 38 and falls to the bottom, the sludge tends to adhere to the holes and grooves of the furnace bed layer 38. The rotation of the arc scraper 18 can scrape off the sludge attached to the holes and grooves of the furnace bed layer 38. Then the sludge passes through the two layers of furnace beds 38 below in sequence and is finally discharged from the discharge port 39.

[0047] After all the sludge falls off from the holes and grooves of the first furnace bed layer 38, the second motor 8 is started. The second motor 8 can drive the rotating rod 12 to start rotating in the inner cavity of the hollow shaft 7. The rotation of the rotating rod 12 drives the first bevel gear 19 to rotate synchronously, so the first bevel gear 19 drives the second bevel gear 20 meshing therewith to start rotating, and the second bevel gear 20 drives the threaded rod 21 to rotate synchronously. The rotation of the threaded rod 21 drives the sliding block 23 to slide on the limit rod 22 in the direction away from the second bevel gear 20. The sliding of the sliding block 23 drives the connecting rod 24 to move synchronously, and the connecting rod 24 pushes the connecting rod 3 25 to move synchronously. The connecting rod 3 25 pushes the connecting rod 4 26 to move in the direction away from the threaded rod 21. The connecting rod 4 26 drives the connecting rod 5 28 to swing with the center of the rotating column 29 as the axis, so that the connecting rod 4 26 also moves in an arc. The function of the connecting rod 3 25 is to prevent the connecting rod 4 26 from getting stuck when performing arc motion. At the same time, the connecting rod 5 28 drives the rotating column 29 to start rotating at the bottom of the fixed plate 27 with the center of the rotating column 29 as the axis. Therefore, the rotating column 29 drives the rake teeth 1 30 to start rotating 90 degrees, so that the synchronous rotation of multiple rake teeth 1 30 by 90 degrees forms a closed state. Therefore, multiple rake teeth 1 30 switch angles and then completely scrape the sludge on the surface of the furnace bed layer 38, so as to avoid the single angle of the rake teeth 1 30 failing to completely scrape the sludge on the surface of the furnace bed layer 38. The inner side and upper surface of the furnace bed layer 38 are cleaned.

[0048] The sludge that has just entered the cylinder 2 and stayed on the first furnace bed layer 38 has a high humidity because it has not been subjected to pyrolysis treatment. At this time, the soil above the first furnace bed layer 38 will stick to it. When the sludge reaches the second furnace bed layer 38 after being heated in the first furnace bed layer 38, its moisture is not enough to stick to the upper surfaces of the second furnace bed layer 38 and the third furnace bed layer 38. Therefore, the rake teeth 40 located on the second furnace bed layer 38 and the third furnace bed layer 38 do not need to be closed.

[0049] Embodiment 2

[0050] See also Fig. 9 and Fig.11 The present embodiment further explains the first embodiment. In the figure, the jet mechanism includes a plurality of air outlet pipes 31, which are linearly connected to the bottom of the outer wall of the cylinder 15 in an array. The inner walls of the plurality of air outlet pipes 31 are fixedly connected with fixed rings 33 near the upper edge. The outer walls of the plurality of air outlet pipes 31 are symmetrically connected with inclined jet pipes 32. The inner bottom ends of the plurality of air outlet pipes 31 are fixedly connected with sleeves 37. Fixed rods 35 are slidably inserted into the interiors of the plurality of sleeves 37. The upper ends of the plurality of fixed rods 35 are fixedly connected with rubber plugs 34. The outer walls of the plurality of rubber plugs 34 are respectively attached to the inner ring surfaces of the plurality of fixed rings 33. The lower ends of the plurality of rubber plugs 34 are fixedly connected with springs 36 respectively between the upper ends of the plurality of sleeves 37. The plurality of springs 36 are slidably sleeved on the outer walls of the plurality of fixed rods 35.

[0051] In this embodiment, the air cooler 6 injects strong cold air into the inner cavity of the hollow shaft 7, and the electric valve 11 is closed first. At this time, the air outlet pipe 10 is closed to the outside world. At this time, the strong cold air output by the air cooler 6 will enter the inner cavity of the cylinder 2 15 through the hollow shaft 7, so that the strong cold air enters the air outlet pipe 2 31 and pushes the rubber plug 34 under the action of air pressure. The rubber plug 34 drives the fixing rod 35 to slide into the inside of the sleeve 37, and the rubber plug 34 compresses the spring 36. When the rubber plug 34 no longer conflicts with the fixing ring 33, the cold air is ejected through the two jet pipes 32 outside the air outlet pipe 2 31 and sprayed to the sides of the two adjacent rake teeth 1 30, blowing off the sludge adhered to the sides of the rake teeth 1 30 above the first furnace bed layer 38.

[0052] When the electric valve 11 is opened, the air outlet pipe 10 is connected to the outside, and the cold air will be discharged to the outside along the air outlet pipe 10. Therefore, the compressed spring 36 pushes the rubber plug 34 through the elastic stretching force to make it contact with the fixed ring 33 again, so that the cold air cannot enter the inner cavity of the air outlet pipe 2 31.

[0053] It should be noted that the electric valve 11 can be controlled to be opened and closed intermittently, so that not only the side of the rake tooth 30 can be cleaned, but also the heat can be discharged to the outside.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sludge disposal system for a municipal sewage plant, comprising a cylinder and a feed pipe connected to the upper end of the cylinder, characterized in that: A hollow shaft is rotatably connected to the inner wall of the middle part of the upper end of the cylinder, four furnace bed layers are fixedly connected to the inner wall of the cylinder in sequence from top to bottom, a driving mechanism is provided between the hollow shaft and the cylinder, a blower mechanism is provided at the lower end of the cylinder, an exhaust mechanism is provided on the outer wall of the hollow shaft, four groups of cylinders 1 are fixedly connected to the outer wall of the hollow shaft in a linear array from top to bottom, each group of cylinders 1 has four cylinders, and cylinders 2 are fixedly connected to the inner sides of the sixteen cylinders 1, the four cylinders 2 at the top are provided with a material-prying mechanism, the bottom of the outer wall of the four cylinders 2 at the top are provided with an air-jet mechanism, and the bottom of the outer wall of the other twelve cylinders 2 are fixedly connected to a group of rake teeth 2 in a linear array; The material-shifting mechanism comprises four fixed plates, which are respectively fixedly connected to the inner walls of the four cylinders 2, and the lower ends of the four fixed plates are rotatably connected to a group of rotating columns, which are respectively movable and penetrate the four cylinders 2, and the bottom ends of the four rotating columns are respectively fixedly connected to rake teeth 1, and the upper edges of the outer walls of the four rotating columns are all fixedly sleeved with connecting rods 5, and the ends of the four connecting rods 5 away from the rotating columns are all rotatably connected to connecting rods 4, and a transmission mechanism is provided between the four connecting rods 4 and the hollow shafts; The outer wall of the hollow shaft is fixedly sleeved with a disc, the bottom of the disc is symmetrically fixedly connected with a connecting rod, and the ends of the two connecting rods away from the disc are fixedly connected with arc scrapers, and the two arc scrapers are both attached to the inner annular surface of the uppermost furnace bed layer.

2. The sludge disposal system for urban sewage treatment plants according to claim 1, characterized in that: The driving mechanism includes a first motor and a second gear. The first motor is fixedly installed on the top of the cylinder through a mounting base. The output shaft end of the first motor is fixedly connected to the first gear. The second gear is fixedly sleeved on the outer wall of the hollow shaft corresponding to the first gear. The first gear and the second gear are meshed with each other.

3. The sludge disposal system for urban sewage treatment plants according to claim 1, characterized in that: The hair dryer mechanism comprises a support frame, which is fixedly connected to the lower end of the cylinder, a cold air blower is fixedly connected to the middle of the support frame, and an air outlet end of the cold air blower is rotatably connected to the bottom end of the hollow shaft.

4. The sludge disposal system for urban sewage treatment plants according to claim 1, characterized in that: The exhaust mechanism comprises an air outlet pipe 1, which is connected to the outer wall of the hollow shaft near the upper edge, and an electric valve is installed on the air outlet pipe 1.

5. The sludge disposal system for urban sewage treatment plants according to claim 1, characterized in that: The transmission mechanism comprises a heat insulation layer, a second motor, four sliding blocks and four supporting blocks, the second motor is fixedly installed at the top end of the hollow shaft, the output shaft end of the second motor is fixedly connected with a rotating rod, and the bottom end of the rotating rod is fixedly connected with the first bevel gear, the four sliding blocks are respectively slidably arranged on the inner walls of the four cylinders two, the middle parts of the inner walls of the four sliding blocks are penetrated and tightened with threaded rods, one end of the four threaded rods corresponding to the axis line of the hollow shaft is fixedly connected with the second bevel gear, the four second bevel gears are meshed with the first bevel gear, the four supporting blocks are respectively fixedly connected to one end of the axis line of the four cylinders one corresponding to the axis line of the hollow shaft, the four threaded rods respectively penetrate and are rotatably connected in the inner walls of the four supporting blocks, the ends of the four sliding blocks away from the first bevel gear are fixedly connected with connecting rod two, the ends of the four connecting rods two away from the sliding blocks are respectively rotatably connected with connecting rod three between the four connecting rods four, and the heat insulation layer is fixedly connected to the upper edge of the inner wall of the hollow shaft.

6. The sludge disposal system for urban sewage treatment plants according to claim 5, characterized in that: The inner wall of the sliding block is symmetrically slidably interlaced with limit rods, and the two limit rods are fixedly connected to the inner wall of the second cylinder.

7. The sludge disposal system for urban sewage treatment plants according to claim 6, characterized in that: The jet mechanism comprises a plurality of air outlet pipes 2, which are linearly arrayed and connected to the bottom of the outer wall of the cylinder 2, the inner walls of the plurality of air outlet pipes 2 are fixedly connected with fixed rings near the upper edge, the outer walls of the plurality of air outlet pipes 2 are symmetrically connected with inclined jet pipes, the inner bottom ends of the plurality of air outlet pipes 2 are fixedly connected with sleeves, the interiors of the plurality of sleeves are slidably inserted with fixed rods, the upper ends of the plurality of fixed rods are fixedly connected with rubber plugs, the outer walls of the plurality of rubber plugs are respectively fitted on the inner ring surfaces of the plurality of fixed rings, the lower ends of the plurality of rubber plugs are respectively fixedly connected with springs between the upper ends of the plurality of sleeves, and the plurality of springs are respectively slidably sleeved on the outer walls of the plurality of fixed rods.

8. The sludge disposal system for urban sewage treatment plants according to claim 1, characterized in that: The bottom of the cylinder and the furnace bed layer below are both provided with discharge ports, and the two discharge ports are interconnected.

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