Low-temperature negative pressure counter-shearing dryer

Abstract

The present application relates to sludge treatment technical field, specifically said is a kind of low-temperature negative pressure opposite shearing dryer, including horizontal cylindrical cylinder body, and left cavity shaft, right cavity shaft being set in cylinder body;Left cavity shaft and right cavity shaft are parallel and horizontal through cylinder body, both ends are sealed rotary connection with cylinder end plate and extend out of cylinder body by bearing and dynamic sealing element, left cavity shaft, right cavity shaft are all provided with flow channel inside;Through the double-layer wall cleaning structure of setting adaptive liquid cleaning plate assembly in the front end of fan blade rotating direction, rear end is provided with scraper, cleaning plate assembly can be adjusted to extend distance according to material viscosity, first complete the crushing of large clumps sludge and the stripping of thick layer sticky material, so that rear end scraper only needs to scrape thin layer residual material, effectively avoid the invalid scraping, excessive scraping or cleaning problem of traditional fixed length scraper, greatly reduce the blade rotation resistance and equipment energy consumption, while improving the scraping precision and service life of scraper.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, specifically to a low-temperature negative pressure counter-shear drying machine. Background Technology

[0002] Sludge, as a solid waste from municipal and industrial wastewater treatment, is characterized by high water content, strong viscosity, and easy agglomeration. Low-temperature negative pressure drying technology has become the mainstream method for drying high-viscosity sludge because it can avoid high-temperature coking of sludge and is energy-efficient. As a result, multi-shaft paddle dryers are widely used in this field.

[0003] Existing high-vacuum multi-shaft paddle dryers mainly consist of an internally heated cylindrical body, hollow paddle shafts, and a drive mechanism. The sludge is stirred and propelled by the rotation of the paddle shafts, and drying is achieved through the heating structure of the cylinder and paddle shafts. A double-sealing structure maintains the vacuum environment inside the cylinder. However, existing equipment has significant technical defects in practical use. The large gap between the circular paddles and the inner wall of the cylinder allows highly viscous sludge to easily adhere to the wall, forming a scale layer, reducing heat transfer efficiency and equipment processing capacity, and requiring frequent shutdowns for cleaning. Furthermore, complex double sealing and external insulation are used to ensure vacuum levels. The traditional cylindrical structure of sludge dryers involves numerous parts, demanding installation requirements, and cumbersome repairs and high maintenance costs when internal components malfunction. Furthermore, the circular blades have weak mixing and shearing action, making them ineffective at breaking up highly viscous sludge and prone to sludge clumping and sticking to the shaft, resulting in uneven drying and low overall drying efficiency. Therefore, a low-temperature negative pressure counter-shear dryer is proposed, which is a self-cleaning, anti-sticking, and easy-to-maintain low-temperature negative pressure dryer with strong adaptability to highly viscous sludge. This improves sludge drying efficiency and the equipment's continuous operation capability, meeting the actual needs of industrial sludge treatment. Summary of the Invention

[0004] To address the problems in the existing technology, this invention provides a low-temperature negative pressure counter-shear dryer, which is a low-temperature negative pressure dryer that can achieve self-cleaning and anti-sticking, convenient maintenance, and strong adaptability to highly viscous sludge, thereby improving sludge drying efficiency and continuous operation capability, and meeting the actual needs of industrial sludge treatment.

[0005] The technical solution adopted by the present invention to solve its technical problem is a low-temperature negative pressure counter-shear drying machine, including a horizontal cylindrical body, and a left cavity shaft and a right cavity shaft disposed inside the body; the left cavity shaft and the right cavity shaft pass through the body horizontally and parallel, and their two ends are sealed and rotatably connected to the end plate of the body through bearings and dynamic seals and extend out of the body; both the left cavity shaft and the right cavity shaft are provided with flow channels inside;

[0006] The outer side of the cylinder is equipped with a drive device that is connected to the ends of the left and right cavity shafts. The drive device drives the left and right cavity shafts to rotate in opposite directions. Multiple cavity-structured fan-shaped blades are uniformly fixed to the outer side of the left and right cavity shafts along the axial direction. The internal cavity of the fan-shaped blades is connected to the flow channel. The fan-shaped blades on the left and right cavity shafts are arranged in a staggered manner. A raised scraper is fixedly connected to the front end of the outer edge of each fan-shaped blade along the direction of rotation. A heating assembly is provided on the outer side of the cylinder for heating the left and right cavity shafts and the fan-shaped blades. Each set of fan-shaped blades is equipped with an adaptive hydraulic cleaning plate assembly that is adjusted according to the viscosity of the material. The adaptive hydraulic cleaning plate assembly is located at the front end of the fan-shaped blade in the direction of rotation.

[0007] Specifically, the adaptive hydraulic cleaning plate assembly includes an opening on the outer edge of the fan-shaped blade, a housing fixedly connected inside the opening, a sliding seat slidably connected inside the housing, a cleaning plate on the side of the sliding seat away from the cavity shaft, one end of the cleaning plate extending out of the housing and slidably connected to the housing, and a groove on the side of the cleaning plate near the direction of rotation, with a squeezing plate slidably connected inside the groove.

[0008] The cleaning plate has a positioning groove inside, and the sliding groove has a slot communicating with the positioning groove. A positioning rod is slidably connected in the positioning groove. The upper end of the positioning rod has a first wedge-shaped extrusion surface. The end of the positioning rod away from the positioning groove is fixedly connected to the sliding seat. A compression spring is fixedly connected between the sliding seat and the cleaning plate. An extrusion rod that slides with the slot is fixedly connected to the side of the extrusion plate near the slot. The end of the extrusion rod away from the extrusion plate has a second wedge-shaped extrusion surface corresponding to the first wedge-shaped extrusion surface.

[0009] Specifically, an inclined liquid storage shell is fixedly connected to one end of the casing inside the fan-shaped blade. A counterweight is slidably connected inside the liquid storage shell. The inner wall of the casing is equipped with a one-way inlet valve and a one-way outlet valve that communicate with the liquid storage shell. The end of the liquid storage shell facing the casing is filled with liquid. The opening of the casing is chamfered.

[0010] Specifically, an elastic sealing ring is fitted on the outside of the counterweight, and buffer limit blocks are fixedly connected to both ends of the liquid storage shell.

[0011] Specifically, the heating assembly includes a jacket fitted around the lower periphery of the cylinder, two long grooves adapted to the stirring range of the fan-shaped blades are opened horizontally at the bottom of the cylinder, a feed inlet is opened at the middle of the top of the cylinder, a discharge outlet is opened at the middle of the bottom of the cylinder, and a vacuum port is also opened at the top of the cylinder.

[0012] The lower part of the jacket is provided with a hot water inlet, and the upper part of the jacket is provided with a hot water outlet; the end of the left cavity shaft extending out of the cylinder is provided with a shaft blade hot water inlet one and a shaft blade hot water outlet one, both of which are connected to the internal flow channel of the left cavity shaft; the end of the right cavity shaft extending out of the cylinder is provided with a shaft blade hot water inlet two and a shaft blade hot water outlet two, both of which are connected to the internal flow channel of the right cavity shaft.

[0013] Specifically, the top of the cylinder is equipped with a maintenance assembly, which includes a quick-opening inspection port and a high-pressure flushing nozzle. The quick-opening inspection port is located on the top of the cylinder and between the feed inlet and the vacuum port. The cover of the quick-opening inspection port is fixed with a quick-clamp handle or bolts. The high-pressure flushing nozzle is located on the cover of the quick-opening inspection port and is flexibly connected to an external high-pressure water source.

[0014] Specifically, the drive unit includes a drive motor, a reducer, and a coupling. The output end of the drive motor is reduced in speed by the reducer and then connected to the ends of the left and right cavity shafts through the coupling.

[0015] Specifically, the scraper and the fan-shaped blades are an integrated structure.

[0016] The beneficial effects of this invention are:

[0017] The low-temperature negative pressure counter-shear dryer of this invention features a double-layer cleaning structure with an adaptive hydraulic cleaning plate assembly at the front end of the fan-shaped blades and a scraper at the rear end. The cleaning plate assembly can adaptively adjust its extension distance according to the viscosity of the material, first breaking down large clumps of sludge and peeling off thick layers of sticky material, so that the rear scraper only needs to scrape off a thin layer of residual material. This effectively avoids the problems of ineffective scraping, excessive scraping, or incomplete cleaning caused by traditional fixed-length scrapers, significantly reducing blade rotation resistance and equipment energy consumption, while improving the scraping accuracy and service life of the scraper.

[0018] The low-temperature negative pressure counter-shear dryer of this invention uses the counter-rotating left and right cavity shafts, combined with staggered fan-shaped blades, to form a counter-shearing action. This action can break up highly viscous sludge clumps, prevent sludge from clumping together, and the staggered fan-shaped blades can scrape off the materials adhering to their sides as they rotate, achieving self-cleaning of the fan-shaped blades. At the same time, it can fully agitate and mix the sludge, making the sludge heat more evenly, significantly improving the drying efficiency and the uniformity of the dried sludge quality.

[0019] The low-temperature negative pressure counter-shear dryer of the present invention uses a dual-circuit heating system that combines a jacket with a left cavity shaft, a right cavity shaft and fan-shaped blades. The heating medium simultaneously achieves indirect heating of the outer periphery of the cylinder and direct contact heating of the fan-shaped blades, which greatly increases the heat transfer area. In addition, the long groove at the bottom of the cylinder matches the heating area with the material stirring area, which significantly improves the heat utilization efficiency.

[0020] The low-temperature negative pressure counter-shear dryer of this invention achieves adaptive extension and fine adjustment by relying on the material extrusion pressure through an adaptive hydraulic cleaning plate assembly. The hydraulic assistance is formed by the cooperation of the counterweight and the liquid flow in the storage tank, which enhances the scraping and crushing force on large clumps of materials. This structure completes automatic extension and self-cleaning actions as the fan-shaped blades rotate. No additional power devices such as motors and cylinders are required throughout the process, so as not to increase the energy consumption of the equipment, nor to damage the low-temperature negative pressure sealing condition of the dryer. It is suitable for the continuous operation requirements of the equipment and reduces the maintenance cost of the equipment. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is an isometric view of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the cylindrical body of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection structure between the left cavity shaft and the right cavity shaft of the present invention;

[0025] Figure 4 This is a top view of the structure of the present invention;

[0026] Figure 5 These are isometric views of the left and right cavity shafts of the present invention.

[0027] Figure 6 This is a schematic cross-sectional view of the fan-shaped blade structure of the present invention;

[0028] Figure 7 for Figure 6 Enlarged view of region A;

[0029] In the diagram: 1. Cylinder; 2. Left cavity shaft; 3. Right cavity shaft; 4. Fan-shaped blade; 5. Scraper; 6. Sleeve; 7. Sliding seat; 8. Cleaning plate; 9. Slide groove; 10. Extrusion plate; 11. Positioning groove; 12. Slot; 13. Positioning rod; 14. Extrusion spring; 15. Extrusion rod; 16. Liquid storage shell; 17. Counterweight; 18. One-way inlet valve; 19. One-way outlet valve; 20. Chamfer; 21. Long groove; 22. Feed inlet; 23. Discharge outlet; 24. Hot water inlet; 25. Hot water outlet; 26. Shaft blade hot water inlet one; 27. Shaft blade hot water outlet one; 28. Shaft blade hot water inlet two; 29. ​​Shaft blade hot water outlet two; 30. Quick-opening inspection port; 31. High-pressure flushing nozzle; 32. Drive motor; 33. Reducer; 34. Vacuum port; 35. Jacket. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] To improve sludge drying efficiency and equipment continuous operation capability, and to meet the actual needs of industrial sludge treatment, as one embodiment of the present invention, such as... Figure 1 , Figure 2 , Figure 3 As shown, the low-temperature negative pressure counter-shear drying machine of the present invention includes a horizontal cylindrical body 1, and a left cavity shaft 2 and a right cavity shaft 3 disposed inside the body 1; the left cavity shaft 2 and the right cavity shaft 3 are parallel and horizontally penetrate the body 1, and their two ends are sealed and rotatably connected to the end plate of the body 1 via bearings and dynamic seals and extend out of the body 1; both the left cavity shaft 2 and the right cavity shaft 3 are provided with flow channels inside;

[0032] The outer side of the cylinder 1 is equipped with a drive device that is connected to the ends of the left cavity shaft 2 and the right cavity shaft 3. The drive device drives the left cavity shaft 2 and the right cavity shaft 3 to rotate in opposite directions. Multiple cavity-structured fan-shaped blades 4 are uniformly fixed along the axial direction on the outer side of the left cavity shaft 2 and the right cavity shaft 3. The internal cavity of the fan-shaped blades 4 is connected to the flow channel. The fan-shaped blades 4 on the left cavity shaft 2 and the right cavity shaft 3 are arranged in a staggered manner. A raised scraper 5 is fixedly connected to the front end of the outer edge of each fan-shaped blade 4 along the direction of rotation. A heating assembly is provided on the outer side of the cylinder 1 for heating the left cavity shaft 2, the right cavity shaft 3 and the fan-shaped blades 4. Each set of fan-shaped blades 4 is equipped with an adaptive hydraulic cleaning plate assembly that is adjusted according to the viscosity of the material. The adaptive hydraulic cleaning plate assembly is located at the front end of the fan-shaped blades 4 in the direction of rotation.

[0033] During use, the heating components are activated to preheat the left cavity shaft 2, right cavity shaft 3, and fan-shaped blades 4, ensuring that each heating component reaches the working temperature required for sludge drying, while maintaining the cylinder 1 in a low-temperature negative pressure working environment. The sludge to be dried is fed into the cylinder 1 from the feed end, causing the sludge to fall into the working area between the left cavity shaft 2 and right cavity shaft 3 inside the cylinder 1. The drive device is then activated, causing the left cavity shaft 2 and right cavity shaft 3 to rotate in opposite directions. The left cavity shaft 2 and right cavity shaft 3 simultaneously drive the fan-shaped blades 4 on their respective shaft sections to rotate with the shafts.

[0034] During the rotation, the fan-shaped blades 4 arranged alternately on the left cavity shaft 2 and the right cavity shaft 3 exert opposing shearing, tearing and tumbling effects on the sludge in the cylinder 1. At the same time, the heating component continuously transfers heat to the fan-shaped blades 4 through the left cavity shaft 2 and the right cavity shaft 3. The fan-shaped blades 4 fully contact the sludge to achieve heat exchange, heat the sludge, and gradually evaporate the moisture inside the sludge.

[0035] When the fan-shaped blade 4 rotates, the adaptive hydraulic cleaning plate assembly first contacts the sludge on the inner wall of the cylinder 1. It adaptively adjusts the extension distance according to the squeezing force generated by the viscosity of the material. As the blade rotates, it squeezes and scrapes the inner wall of the cylinder 1, breaking up the clumps of highly viscous sludge and peeling off the sticky material on the inner wall. This prevents the sludge from clumping together and improves the equipment's adaptability to highly viscous sludge. At the same time, it prevents large clumps of sludge from affecting the heat transfer efficiency. After the adaptive hydraulic cleaning plate assembly completes the initial scraping, the protruding scraper 5 at the outer edge of the fan-shaped blade 4 continues to rotate with the blade to perform a secondary scraping of the inner wall of the cylinder 1, removing the residual sticky material on the inner wall and keeping the heat transfer surface inside the cylinder 1 clean. This greatly improves the heat exchange efficiency, eliminates the need for frequent shutdowns for cleaning, and ensures continuous and efficient operation of the equipment.

[0036] Meanwhile, the staggered fan-shaped blades 4 clean each other's side sludge by matching side spacing during rotation, preventing sludge from sticking to the wall and clumping together, achieving self-cleaning of the fan-shaped blades 4, avoiding material accumulation between the blades, further ensuring mixing and shearing effects, while reducing the frequency of maintenance of the fan-shaped blades 4 and reducing equipment operating costs.

[0037] The opposing rotation of the left cavity shaft 2 and the right cavity shaft 3 drives the fan-shaped blades 4 to shear and stir, while pushing the sludge in the cylinder 1 to move slowly along the axis towards the discharge end of the cylinder 1. During the process of pushing, the sludge continuously completes the heating, drying and self-cleaning operations, realizing continuous drying treatment. When the sludge moves to the discharge end of the cylinder 1 with the push of the fan-shaped blades 4, the dried sludge is discharged from the discharge end of the cylinder 1, completing one sludge drying process.

[0038] To better adapt to the cleaning needs of different material working conditions, for example, such as Figure 5 , Figure 6 , Figure 7 As shown, the present invention also includes an adaptive hydraulic cleaning plate assembly including an opening on the outer edge of the fan-shaped blade 4, a housing 6 fixedly connected inside the opening, a sliding seat 7 slidably connected inside the housing 6, a cleaning plate 8 provided on the side of the sliding seat 7 away from the cavity shaft, one end of the cleaning plate 8 extending out of the housing 6 and slidably connected to the housing 6, and a groove 9 provided on the side of the cleaning plate 8 near the rotation direction, and a pressing plate 10 slidably connected inside the groove 9.

[0039] The cleaning plate 8 has a positioning groove 11 inside, and the sliding groove 9 has a slot 12 communicating with the positioning groove 11 inside. A positioning rod 13 is slidably connected in the positioning groove 11. The upper end of the positioning rod 13 has a first wedge-shaped extrusion surface. The end of the positioning rod 13 away from the positioning groove 11 is fixedly connected to the sliding seat 7. A compression spring 14 is fixedly connected between the sliding seat 7 and the cleaning plate 8. The side of the extrusion plate 10 near the slot 12 is fixedly connected to an extrusion rod 15 that slides with the slot 12. The end of the extrusion rod 15 away from the extrusion plate 10 has a second wedge-shaped extrusion surface corresponding to the first wedge-shaped extrusion surface.

[0040] In operation, the drive unit rotates the left cavity shaft 2, the right cavity shaft 3, and the fan-shaped blades 4 in opposite directions. When the amount of sludge material in the cylinder 1 is large and its viscosity is high, forming large clumps, the material squeezes the extrusion plate 10. After being squeezed by the material, the extrusion plate 10 slides along the slide groove 9 towards the casing 6. During the sliding process, the extrusion plate 10 drives the extrusion rod 15 to move synchronously. The second wedge-shaped extrusion surface of the extrusion rod 15 and the first wedge-shaped extrusion surface of the positioning rod 13 generate relative extrusion, driving the cleaning plate 8 to overcome the extrusion spring 14. The elasticity extends outward a certain distance along the shell 6, so that the end of the cleaning plate 8 is attached to the inner wall of the cylinder 1 or the surface of large clumps of material. When the fan-shaped blade 4 rotates with the cavity shaft, the extended cleaning plate 8 scrapes and breaks up the large clumps of material adhering to the inner wall of the cylinder 1, and at the same time tears and disperses the large clumps of sludge gathered around the blades, so as to avoid the accumulation and clumping of large clumps of material in the cylinder, and avoids the technical problem of poor cleaning effect of conventional scraper 5 on large clumps of material, thereby solving the problem of uneven drying caused by large clumps of high-viscosity sludge.

[0041] Meanwhile, the extension distance of the cleaning plate 8 is automatically controlled by the extrusion pressure generated by the amount and viscosity of the material in the cylinder 1. The higher the viscosity of the material and the larger the agglomeration, the stronger the extrusion pressure, the further the cleaning plate 8 extends, and the stronger the scraping and cleaning effect. After the material working conditions are improved, it automatically resets without manual adjustment, realizing adaptive cleaning and adapting to the sludge drying needs of different characteristics and different processing volumes. When the amount of material in the cylinder 1 decreases and the viscosity decreases, the extrusion pressure on the extrusion plate 10 weakens. The reset force of the extrusion spring 14 pushes the cleaning plate 8 to slide inward along the sleeve 6. The extrusion rod 15 separates from the wedge-shaped surface of the positioning rod 13. The extrusion plate 10 resets synchronously with the cleaning plate 8, and the cleaning plate 8 returns to the initial position, adapting to the cleaning needs of different material working conditions.

[0042] After the front-end adaptive hydraulic cleaning plate assembly completes the scraping process in advance, the rear scraper 5 no longer needs to deal with large sludge clumps of different hardness inside the cylinder, effectively reducing the scraping load on the scraper 5, minimizing damage to the scraper 5, significantly reducing the overall rotational resistance of the fan-shaped blades 4, and reducing additional energy consumption; at the same time, the front end has already specifically broken and peeled off sludge clumps of different sizes and hardness, so the rear scraper 5 only needs to perform a secondary scraping of the sticky material remaining on the inner wall of the cylinder 1, avoiding the problem of excessive scraping or incomplete cleaning by the scraper 5, and significantly improving the accuracy and efficiency of the scraping operation of the scraper 5.

[0043] To achieve automatic self-cleaning of the cleaning plate 8, for example, such as Figure 6 , Figure 7As shown, the present invention also includes an inclined liquid storage shell 16 fixedly connected to one end of the shell 6 located inside the fan-shaped blade 4, a counterweight 17 being slidably connected inside the liquid storage shell 16, a one-way liquid inlet valve 18 and a one-way liquid outlet valve 19 communicating with the liquid storage shell 16 on the inner wall of the shell 6, and the liquid storage shell 16 being filled with liquid at the end facing the shell 6; a chamfer 20 is provided at the opening of the shell 6.

[0044] During use, the fan-shaped blade 4 rotates with the cavity shaft. When the adaptive hydraulic cleaning plate assembly moves to the bottom of the cavity shaft, the counterweight 17 is subjected to gravity and slides along the inclined liquid storage shell 16 toward one end of the casing 6. During the sliding process, the liquid in the liquid storage shell 16 is squeezed, so that the liquid quickly enters the casing 6 through the one-way liquid outlet valve 19, pushing the sliding seat 7, the cleaning plate 8 and the compression spring 14 to extend outward, effectively scraping the cylinder wall of the cylinder 1 and the large clumps of material around the fan-shaped blade 4.

[0045] As the fan-shaped blade 4 continues to rotate above the cavity shaft, the counterweight 17 slides along the liquid storage shell 16 away from the end of the sleeve 6 by its own weight. During the sliding process, a negative pressure suction effect is formed in the liquid storage shell 16. The liquid in the sleeve 6 is quickly drawn back into the liquid storage shell 16 through the one-way liquid inlet valve 18. After the liquid in the sleeve 6 is drawn, the sliding seat 7 is driven to retract inward along the sleeve 6 by the weight of the sliding seat 7 and the cleaning plate 8. At the same time, the cleaning plate 8 is driven to move towards the sliding seat 7 by the return spring force of the compression spring 14. During the retraction process, the chamfer 20 can facilitate the compression plate 10 to slide into the inside of the sleeve 6. The inner wall of the sleeve 6 will scrape the four sides of the cleaning plate 8 in all directions to remove the sludge and impurities adhering to the cleaning plate 8, realize the automatic self-cleaning of the cleaning plate 8, avoid the accumulation of sludge on the surface of the cleaning plate 8, ensure the effect of subsequent scraping operations, and at the same time, no additional cleaning steps are required, reducing equipment maintenance costs.

[0046] The fan-shaped blade 4 rotates continuously with the cavity shaft, and the counterweight 17 slides back and forth as the position of the fan-shaped blade 4 changes. The liquid continuously circulates between the liquid storage shell 16 and the outer shell 6, driving the cleaning plate 8 to complete the downward extension scraping and upward retraction self-cleaning cycle action, realizing the continuous cleaning of the clumps of material in the cylinder 1. The entire process is driven by gravity and spring force, without the need to add motors, cylinders or other additional power devices, without increasing equipment energy consumption, and without damaging the low temperature negative pressure sealing condition of the dryer.

[0047] For example, the present invention also includes an elastic sealing ring sleeved on the outer side of the counterweight 17, and buffer limiting blocks fixedly connected to both ends of the liquid storage shell 16.

[0048] During use, the elastic sealing ring enables a sealed sliding fit between the counterweight 17 and the inner wall of the liquid storage shell 16, ensuring stable hydraulic driving force and reducing frictional wear of the counterweight 17, thus ensuring smooth sliding.

[0049] The buffer limiting blocks at both ends of the liquid storage shell 16 can form a flexible limit on the counterweight 17, avoiding hard collisions between it and the end of the liquid storage shell 16, and preventing the liquid storage shell 16 from deforming and cracking and the counterweight 17 from shifting.

[0050] To improve heat utilization efficiency and avoid heat waste, for example, such as Figure 2 , Figure 3 As shown, the present invention also includes a heating assembly including a jacket 35 fitted around the lower periphery of the cylinder 1, two long grooves 21 adapted to the stirring range of the fan-shaped blades 4 are opened in the horizontal direction at the bottom of the cylinder 1, a feed inlet 22 is opened at the middle of the top of the cylinder 1, a discharge outlet 23 is opened at the middle of the bottom of the cylinder 1, and a vacuum port is also opened at the top of the cylinder 1.

[0051] The jacket 35 has a hot water inlet 24 at the lower part and a hot water outlet 25 at the upper part; the end of the left cavity shaft 2 extending out of the cylinder 1 has a shaft blade hot water inlet 26 and a shaft blade hot water outlet 27, both of which are connected to the internal flow channel of the left cavity shaft 2; the end of the right cavity shaft 3 extending out of the cylinder 1 has a shaft blade hot water inlet 28 and a shaft blade hot water outlet 29, both of which are connected to the internal flow channel of the right cavity shaft 3.

[0052] In use, hot water is first introduced into the hot water inlet 24 at the lower part of the jacket 35. The hot water flows from bottom to top along the jacket 35 and is finally discharged from the hot water outlet 25 at the upper part of the jacket 35. At the same time, hot water is introduced into the first hot water inlet 26 and the second hot water inlet 28 of the shaft blade respectively. The hot water enters the internal cavity of the fan blade 4 through the internal flow channels of the left cavity shaft 2 and the right cavity shaft 3, and is then discharged from the first hot water outlet 27 and the second hot water outlet 29 of the shaft blade, so that the hot water is in full contact with the fan blade 4 and achieves direct internal heating of the fan blade 4.

[0053] The two long grooves 21 inside the cylinder 1 are adapted to the stirring range of the fan-shaped blades 4, so that the heating area of ​​the jacket 35 corresponds completely to the main stirring area of ​​the material inside the cylinder 1, with no heating dead corners, so that the heat is concentrated on the sludge to be dried, greatly improving the heat utilization efficiency and avoiding heat waste.

[0054] Open the vacuum port at the top of the cylinder 1 to perform a vacuum operation on the inner cavity of the cylinder 1, maintain the low temperature negative pressure condition inside the cylinder 1, and at the same time, the evaporated water vapor is drawn away through the vacuum port, effectively reducing the boiling point of water in the sludge, realizing the low temperature drying of the sludge, and avoiding the sludge from coking and deteriorating due to high temperature heating.

[0055] The high-viscosity sludge to be dried is fed into the cylinder 1 through the feed port 22 at the top middle of the cylinder 1. The left cavity shaft 2 and the right cavity shaft 3 are driven to rotate in opposite directions, which drives the fan-shaped blades 4 to rotate synchronously. The staggered fan-shaped blades 4 have a shearing and tearing effect on the sludge, breaking up sludge clumps and preventing sludge from sticking to the shaft and clumping together. At the same time, the scraper 5 on the outer edge of the fan-shaped blades 4 continuously scrapes the inner wall of the cylinder 1 as the blades rotate, timely removing the adhering sludge and keeping the heat transfer surface inside the cylinder 1 clean.

[0056] The dried sludge is continuously discharged from the discharge port 23, realizing continuous operation of sludge feeding, drying and discharge, which is suitable for the needs of large-scale industrial sludge treatment.

[0057] When the sludge drying operation is completed or the machine needs to be shut down, first stop feeding sludge into the feed inlet 22. After all the remaining sludge in the cylinder 1 has dried and been discharged from the discharge outlet 23, turn off the drive device and then stop the supply of hot water. After the residual hot water in the jacket 35, left cavity shaft 2, right cavity shaft 3 and fan blade 4 has been completely drained from the corresponding outlets, close the vacuum port to prevent residual hot water from accumulating due to equipment shutdown and cooling, and to prevent corrosion and scaling problems inside the cylinder 1, cavity shaft and fan blade 4, effectively extending the service life of the heating components and core components of the equipment.

[0058] For example, such as Figure 2 , Figure 3 , Figure 4 As shown, the present invention also includes a maintenance assembly on the top of the cylinder 1. The maintenance assembly includes a quick-opening inspection port 30 and a high-pressure flushing nozzle 31. The quick-opening inspection port 30 is located on the top of the cylinder 1 and between the feed inlet 22 and the vacuum port. The cover plate of the quick-opening inspection port 30 is fixed by a quick-clamp handle or bolts. The high-pressure flushing nozzle 31 is located on the cover plate of the quick-opening inspection port 30 and is flexibly connected to an external high-pressure water source.

[0059] When the equipment is in use, if slight material sticking occurs on the inner wall of the cylinder 1, the left cavity shaft 2, the right cavity shaft 3, or the fan-shaped blades 4 after the equipment has been running for a period of time, there is no need to stop the machine. Just turn on the external high-pressure water source and spray the high-pressure water through the high-pressure flushing nozzle 31 to the inner wall of the cylinder 1, the left cavity shaft 2, the right cavity shaft 3, and the surface of the fan-shaped blades 4 to remove the sticky material.

[0060] When the equipment needs internal component inspection and maintenance, or when stubborn scale cannot be removed by high-pressure flushing, the quick-opening inspection port 30 cover can be quickly opened by using the quick-clamp handle or the removal bolt. Operators can then use the quick-opening inspection port 30 to inspect and clean the inside of the cylinder 1.

[0061] For example, such as Figure 2As shown, the present invention also includes a drive device comprising a drive motor 32, a reducer 33 and a coupling. The output end of the drive motor 32 is reduced in speed by the reducer 33 and then connected to the ends of the left cavity shaft 2 and the right cavity shaft 3 in a one-to-one transmission connection through the coupling.

[0062] When in use, the drive motor 32 is started. The power output by the motor is reduced and increased in torque by the reducer 33 to adjust to the speed and torque suitable for sludge drying. The power adjusted by the reducer 33 is transmitted to the left cavity shaft 2 and the right cavity shaft 3 through the coupling, driving the two to rotate synchronously in opposite directions, driving the fan-shaped blades 4 to shear, stir and propel the sludge in the cylinder 1.

[0063] For example, the present invention also includes a scraper 5 and a fan-shaped blade 4 as an integral structure.

[0064] When in use, the scraper 5 and the fan-shaped blade 4 adopt an integrated structure, which has higher connection strength than the separate fixed structure. It can withstand the reaction force of highly viscous sludge, prevent the scraper 5 from falling off or deforming during the scraping process, and improve the structural stability and service life of the scraper 5.

[0065] In use, hot water is introduced into the hot water inlet 24 of the jacket 35 at the bottom of the cylinder 1. The hot water flows from bottom to top along the jacket 35 and is discharged from the hot water outlet 25, providing indirect heating to the cylinder 1 from the outside. At the same time, hot water is introduced into the first hot water inlet 26 of the left cavity shaft 2 and the second hot water inlet 28 of the right cavity shaft 3. The hot water enters the internal cavity of the fan-shaped blade 4 through the internal flow channel of the cavity shaft, and after heat exchange, it is discharged from the corresponding hot water outlet 27 and hot water outlet 29 of the fan-shaped blade, achieving direct contact heating of the fan-shaped blade 4 until each heating component reaches the working temperature required for sludge drying. At the same time, the vacuum port at the top of the cylinder 1 is opened to perform a vacuum operation on the inner cavity of the cylinder 1, maintaining a low-temperature negative pressure condition inside the cylinder 1.

[0066] The high-viscosity sludge to be dried is fed into the feed port 22 at the top middle of the cylinder 1, so that the sludge falls into the core working area between the left cavity shaft 2 and the right cavity shaft 3 inside the cylinder 1. The drive motor 32 on the outside of the cylinder 1 is started. The motor output power is reduced and increased in torque by the reducer 33, and then transmitted to the left cavity shaft 2 and the right cavity shaft 3 through the coupling, driving the two to rotate synchronously in opposite directions. This also drives the fan-shaped blades 4 on the shaft to rotate with the shaft. The fan-shaped blades 4, which are arranged in a staggered manner on the left cavity shaft 2 and the right cavity shaft 3, generate opposing shearing, tearing and tumbling effects on the sludge during the rotation. At the same time, the fan-shaped blades 4 continue to be in full contact with the sludge to complete heat exchange, so that the moisture inside the sludge gradually evaporates.

[0067] When the fan-shaped blade 4 rotates in opposite directions with the left cavity shaft 2 and the right cavity shaft 3, the adaptive hydraulic cleaning plate assembly at the front end of the rotation direction contacts the inner wall of the cylinder 1 and the sludge first. It automatically adjusts the extension distance according to the squeezing force generated by the viscosity of the material to break up large clumps of sludge and peel off the thick layer of sticky material on the inner wall of the cylinder 1, completing the initial scraping and cleaning. When the fan-shaped blade 4 rotates to the bottom of the cavity shaft, the counterweight 17 in the liquid storage shell 16 slides under gravity, squeezing the liquid into the sleeve 6 and pushing the cleaning plate 8 outward to facilitate scraping the inner wall of the cylinder 1.

[0068] When the fan-shaped blade 4 rotates above the cavity shaft, the counterweight 17 slides along the liquid storage shell 16 away from the sleeve 6 by its own weight, and the liquid in the sleeve 6 is drawn back to the liquid storage shell 16 through the one-way liquid inlet valve 18. The cleaning plate 8 is then in a contracted state. During the contraction of the cleaning plate 8, the inner wall of the sleeve 6 will scrape its surrounding surface to remove the sludge and impurities adhering to the cleaning plate 8, thereby realizing the automatic self-cleaning of the cleaning plate 8 assembly, avoiding the accumulation of sludge on the plate surface, and improving the subsequent scraping and cleaning effect on the inner wall of the cylinder 1.

[0069] After the cleaning plate 8 completes the initial scraping, the integrated scraper 5 on the outer edge of the fan-shaped blade 4 rotates with the blade to perform a secondary scraping of the inner wall of the cylinder 1, removing a thin layer of residual material; at the same time, as the staggered fan-shaped blades 4 rotate, they scrape off the sludge adhering to each other's sides through the appropriate side spacing, realizing the self-cleaning of the fan-shaped blades 4. The double-layer wall cleaning structure avoids the problems of excessive scraping or incomplete cleaning of traditional fixed-length scrapers 5, greatly reducing the blade rotation resistance and equipment energy consumption, while improving the scraping accuracy and service life of the scraper 5;

[0070] The opposing rotation of the left cavity shaft 2 and the right cavity shaft 3 drives the fan-shaped blades 4 to shear, stir, and clean the walls, while pushing the sludge in the cylinder 1 to move slowly along the axis towards the discharge end of the cylinder 1. During the process of pushing, the sludge continuously completes heating, drying and self-cleaning operations, forming a continuous drying process. When the sludge moves to the discharge end of the cylinder 1 with the push of the fan-shaped blades 4, the dried sludge is continuously discharged from the discharge port 23 at the bottom middle of the cylinder 1, completing one sludge drying process. By keeping the feed inlet 22 continuously feeding, continuous production of sludge drying can be achieved.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature negative pressure counter-shear drying machine, characterized in that, It includes a horizontal cylindrical body (1), and a left cavity shaft (2) and a right cavity shaft (3) set inside the body (1); the left cavity shaft (2) and the right cavity shaft (3) pass through the body (1) horizontally and parallel. Both ends of the two shafts are connected to the end plate of the body (1) by bearings and dynamic seals and extend out of the body (1). The left cavity shaft (2) and the right cavity shaft (3) are both provided with flow channels inside. The outer side of the cylinder (1) is provided with a drive device that is connected to the end of the left cavity shaft (2) and the right cavity shaft (3). The drive device drives the left cavity shaft (2) and the right cavity shaft (3) to rotate in opposite directions. Multiple cavity-structured fan-shaped blades (4) are uniformly fixed along the axial direction on the outer side of the left cavity shaft (2) and the right cavity shaft (3). The internal cavity of the fan-shaped blades (4) is connected to the flow channel. The fan-shaped blades (4) on the left cavity shaft (2) and the right cavity shaft (3) are arranged in a staggered manner. A raised scraper (5) is fixedly connected to the front end of the outer edge of each fan-shaped blade (4) along the rotation direction. A heating assembly is provided on the outer side of the cylinder (1) for heating the left cavity shaft (2), the right cavity shaft (3) and the fan-shaped blades (4). Each set of fan-shaped blades (4) is provided with an adaptive hydraulic cleaning plate assembly that is adjusted according to the viscosity of the material. The adaptive hydraulic cleaning plate assembly is located at the front end of the fan-shaped blades (4) in the rotation direction. The adaptive hydraulic cleaning plate assembly includes an opening on the outer edge of the fan-shaped blade (4), a housing (6) is fixedly connected inside the opening, a sliding seat (7) is slidably connected inside the housing (6), a cleaning plate (8) is provided on the side of the sliding seat (7) away from the cavity shaft, one end of the cleaning plate (8) extends out of the housing (6) and is slidably connected to the housing (6), and a groove (9) is provided on the side of the cleaning plate (8) near the rotation direction, and a squeezing plate (10) is slidably connected inside the groove (9). The cleaning plate (8) has a positioning groove (11) inside, and the sliding groove (9) has a slot (12) that communicates with the positioning groove (11) inside. A positioning rod (13) is slidably connected in the positioning groove (11). The upper end of the positioning rod (13) has a first wedge-shaped extrusion surface. The end of the positioning rod (13) away from the positioning groove (11) is fixedly connected to the sliding seat (7). A compression spring (14) is fixedly connected between the sliding seat (7) and the cleaning plate (8). The side of the extrusion plate (10) close to the slot (12) is fixedly connected to an extrusion rod (15) that slides with the slot (12). The end of the extrusion rod (15) away from the extrusion plate (10) has a second wedge-shaped extrusion surface corresponding to the first wedge-shaped extrusion surface. The end of the casing (6) located inside the fan-shaped blade (4) is fixedly connected to an inclined liquid storage shell (16). The liquid storage shell (16) is sealed and slidably connected to a counterweight (17). The inner wall of the casing (6) is provided with a one-way liquid inlet valve (18) and a one-way liquid outlet valve (19) communicating with the liquid storage shell (16). The end of the liquid storage shell (16) facing the casing (6) is filled with liquid. The opening of the casing (6) is provided with a chamfer (20).

2. The low-temperature negative pressure counter-shear drying machine according to claim 1, characterized in that, An elastic sealing ring is fitted on the outside of the counterweight (17), and buffer limit blocks are fixedly connected to both ends of the liquid storage shell (16).

3. A low-temperature negative pressure counter-shear drying machine according to claim 2, characterized in that, The heating assembly includes a jacket (35) fitted around the lower periphery of the cylinder (1), two long grooves (21) adapted to the stirring range of the fan-shaped blades (4) are opened at the bottom of the cylinder (1) in the horizontal direction, a feed inlet (22) is opened at the middle of the top of the cylinder (1), a discharge outlet (23) is opened at the middle of the bottom of the cylinder (1), and a vacuum port (34) is also opened at the top of the cylinder (1). The lower part of the jacket is provided with a hot water inlet (24), and the upper part of the jacket is provided with a hot water outlet (25); the end of the left cavity shaft (2) extending out of the cylinder (1) is provided with a first shaft blade hot water inlet (26) and a first shaft blade hot water outlet (27), both of which are connected to the internal flow channel of the left cavity shaft (2); the end of the right cavity shaft (3) extending out of the cylinder (1) is provided with a second shaft blade hot water inlet (28) and a second shaft blade hot water outlet (29), both of which are connected to the internal flow channel of the right cavity shaft (3).

4. A low-temperature negative pressure counter-shear drying machine according to claim 3, characterized in that, The top of the cylinder (1) is provided with a maintenance component, which includes a quick-opening inspection port (30) and a high-pressure flushing nozzle (31). The quick-opening inspection port (30) is located on the top of the cylinder (1) and between the feed inlet (22) and the vacuum port. The cover plate of the quick-opening inspection port (30) is fixed by a quick-clamp handle or bolts. The high-pressure flushing nozzle (31) is located on the cover plate of the quick-opening inspection port (30). The high-pressure flushing nozzle (31) is flexibly connected to the external high-pressure water source.

5. A low-temperature negative pressure counter-shear drying machine according to claim 4, characterized in that, The drive unit includes a drive motor (32), a reducer (33) and a coupling. The output end of the drive motor (32) is reduced by the reducer (33) and then connected to the ends of the left cavity shaft (2) and the right cavity shaft (3) through the coupling.

6. A low-temperature negative pressure counter-shear drying machine according to claim 1, characterized in that, The scraper (5) and the fan-shaped blade (4) are an integral structure.

Images