Sludge crushing, screening and fuel production device
By installing an automatic cleaning system with scrapers and return springs inside the drum screen, combined with precise control by a servo motor, the problem of mud adhesion on the inner wall of the drum screen is solved, enabling continuous screening and crushing of sludge, and improving the operating efficiency and stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUICHANG HONGSHI ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-23
AI Technical Summary
When processing dry sludge, existing rotary drum screens suffer from reduced screening efficiency due to the adhesion of sludge layers on the inner wall. This can lead to equipment blockage, affecting the continuity of the processing flow, requiring shutdown for cleaning, and reducing work efficiency.
A sludge crushing, screening, and fuel preparation device was designed. It adopts a combination of scraper and return spring. The trapezoidal inclined surface of the scraper makes close contact with the inner wall of the drum screen, automatically scraping off the sludge from the inner wall. Combined with a servo motor to precisely control the rotation speed, it can achieve continuous screening and crushing of sludge and avoid downtime for cleaning.
It has achieved stable and efficient operation of the sludge screening process, prevented the accumulation of sludge on the inner wall, ensured continuous operation of the equipment, improved work efficiency and production capacity, reduced energy consumption, and enhanced the stability and service life of the equipment.
Smart Images
Figure CN224394749U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sludge treatment technology, specifically to a sludge crushing, screening, and fuel preparation device. Background Technology
[0002] With the acceleration of urbanization and rapid industrial development, the amount of sewage sludge generated has increased dramatically. As a byproduct of wastewater treatment, the proper disposal of sewage sludge has become one of the major challenges facing the environmental protection field.
[0003] Existing rotary drum screens or other screening devices often face the problem of mud adhering to the inner wall when processing dry sludge. This mud adhering not only reduces screening efficiency and the effective screening area, but also, with the accumulation of mud, can cause blockage of the screening device, affecting the continuity of the entire sludge treatment process. This requires operators to open the inspection port of the rotary drum screen or disassemble part of the rotary drum screen after the equipment has stopped running, and then use tools such as shovels and brushes to remove and clean the mud adhering to the inner wall. This cleaning can only be done after the equipment has stopped running, which increases the downtime of the equipment. During the sludge treatment process, frequent shutdowns to clean the inner wall mud can interrupt the entire treatment process and affect work efficiency. Utility Model Content
[0004] The purpose of this invention is to provide a sludge crushing, screening, and fuel preparation device to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, this utility model provides a sludge crushing, screening, and fuel preparation device, including a drum screen, a mounting rod, a fixing sleeve fixedly installed on the outer wall of the mounting rod; a sliding rod slidably mounted on the fixing sleeve; a return spring fixedly installed between the fixing sleeve and the sliding rod; a fixing rod fixedly installed at one end of the sliding rod, with a torsion spring sleeved on the outer wall of the fixing rod; two scrapers rotatably connected to the fixing rod, the cross-section of the scrapers being trapezoidal, and the acute angle formed by the inclined surface of the scrapers abutting against the inner wall of the drum screen; a torsion spring disposed between the two scrapers; and multiple cleaning plates fixedly installed on the inner wall of the drum screen, with two plates forming a group.
[0006] Furthermore, a servo motor is provided on one side of the drum screen, and a fixing ring is fixedly installed at one end of the drum screen, with the drive end of the servo motor fixedly connected to the fixing ring.
[0007] Furthermore, the mounting rod is disposed inside the drum screen, a mounting frame is fixedly installed on one side of the drum screen, a first fixing block is fixedly installed on the mounting frame, one end of the mounting rod extends to the outside of the drum screen, and the extended end of the mounting rod is fixedly installed on the first fixing block.
[0008] Furthermore, a support frame is provided below the drum screen, the fixing ring is sleeved on the outside of the mounting rod, the fixing ring is rotatably connected to the first fixing block, and the other end of the mounting rod extends to the outlet of the drum screen and is bent and installed on the support frame at the bottom of the drum screen.
[0009] Furthermore, a limit ring is fixedly installed on the outer wall of the drum screen, a fixed frame is fixedly installed on the support frame, and a roller is fixedly installed on the fixed frame, with the limit ring set on the roller.
[0010] Furthermore, a crushing device is fixedly installed on the support frame, and two crushing rollers are installed on the outer wall of the crushing device, with the bottom end of the crushing device extending into the interior of the drum screen.
[0011] Furthermore, a fuel preparation device body is provided at the outlet of the drum screen, a heating device is provided on the top of the fuel preparation device body, a blower is fixedly installed on the top of the heating device, and a stirring device is provided inside the fuel preparation device body.
[0012] Furthermore, an L-shaped fixing block is fixedly installed at one end of the slide rod, and the end of the fixing rod away from the slide rod is fixedly installed on the inner wall of the L-shaped fixing block. An elastic membrane layer is fixedly installed between the L-shaped fixing block and the scraper.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. In this utility model, when the device is running, the drum screen rotates, and the internal sludge tumbles and acts on the screen mesh for screening. Because the sludge is sticky and easily adheres to the inner wall due to friction, the fixed scraper, under the action of the return spring and the sliding rod, closely abuts against the inner wall. Its trapezoidal inclined surface scrapes away the sludge from the inner wall. After the sludge that rotates with the drum screen hits the scraper, the sludge is continuously scraped off, preventing accumulation, ensuring unobstructed screen holes, maintaining stable and efficient screening, and allowing the sludge to be screened into subsequent stages according to particle size requirements. The rotation of the drum screen also drives the cleaning plate to rotate, applying pressure to the scraper so that it bends under the action of the torsion spring. The rotating cleaning plate cleans the sludge adhering to the scraper. After contact, the scraper returns to a horizontal position. This method can automatically clean the inner wall sludge layer during operation without stopping the machine, ensuring continuous operation of the equipment and continuous screening, improving efficiency, stabilizing the sludge treatment rhythm and flow rate, and helping to increase the production capacity of the device.
[0015] 2. In this invention, the crushing device is mounted on a support frame, with its bottom end extending into the inside of the drum screen, and it has two crushing rollers. This layout allows the sludge crushing and screening processes to be closely integrated. The sludge can be immediately crushed by the crushing device after entering the drum screen, resulting in smaller sludge particles, which is more beneficial for the subsequent screening process. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the internal structure of the drum screen of this utility model;
[0018] Figure 3 This is a schematic diagram of the connection structure between the fixing rod and the scraper in this utility model;
[0019] Figure 4 for Figure 2 Enlarged view of the structure at point A in the middle;
[0020] Figure 5 for Figure 2 Enlarged view of the structure at point B.
[0021] In the diagram: 1. Rotary drum screen; 2. Mounting rod; 3. Fixing sleeve; 4. Return spring; 5. Slide rod; 6. Fixing rod; 7. Torsion spring; 8. Scraper; 9. Cleaning plate; 10. L-shaped fixing block; 11. Elastic membrane layer; 12. Servo motor; 13. First fixing block; 14. Fixing ring sleeve; 15. Crushing device; 16. Fuel preparation device body. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Please see Figures 1-5 This utility model provides a technical solution:
[0024] See Figures 1-5 As shown, a sludge crushing, screening, and fuel preparation device includes a drum screen 1, a mounting rod 2, a fixing sleeve 3 fixedly installed on the outer wall of the mounting rod 2; a sliding rod 5 slidably mounted on the fixing sleeve 3; a return spring 4 fixedly installed between the fixing sleeve 3 and the sliding rod 5; a fixing rod 6 fixedly installed at one end of the sliding rod 5, with a torsion spring 7 sleeved on the outer wall of the fixing rod 6; two scrapers 8 rotatably connected to the fixing rod 6, the cross-section of the scraper 8 being trapezoidal, and the acute angle formed by the inclined surface of the scraper 8 abutting against the inner wall of the drum screen 1; a torsion spring 7 disposed between the two scrapers 8; and multiple cleaning plates 9 fixedly installed on the inner wall of the drum screen 1, with two plates forming a group.
[0025] During operation, the drum screen 1 begins to rotate, causing the sludge inside to tumble and interact with the screen mesh for screening. Due to the stickiness of the sludge and the friction with the inner wall of the drum screen 1, it easily adheres to the inner wall. At this time, the scraper 8, which abuts against the inner wall of the drum screen 1, begins to work. The position of the scraper 8 remains unchanged, and the return spring 4, through the slide rod 5, ensures that the scraper 8 is tightly abutted against the inner wall of the drum screen 1. When the sludge rotates with the drum screen 1 and encounters the scraper 8, because the cross-section of the scraper 8 is trapezoidal and its acute angle abuts against the inner wall of the drum screen 1, it can effectively scrape off the sludge adhering to the inner wall of the drum screen 1, continuously removing the sludge adhering to the inner wall. This effectively prevents the accumulation of sludge on the inner wall of the drum screen 1, ensuring that the screen holes of the drum screen 1 remain unobstructed, maintaining stable and efficient operation of the sludge screening process. This allows the sludge to be successfully screened out according to the set particle size requirements for subsequent fuel production.
[0026] When the drum screen 1 rotates, it drives the cleaning plate 9 to rotate as well. The rotation of the cleaning plate 9 applies downward pressure to the scraper 8. Under the action of the torsion spring 7, the two scraper 8 bend downward. When the cleaning plate 9 rotates downward, it can clean the sludge adhering to the scraper 8. When the cleaning plate 9 slides and contacts the scraper 8, the scraper 8 returns to a horizontal position under the action of the torsion spring 7. The above can automatically clean the mud layer on the inner wall of the drum screen 1 during operation without additional downtime. The equipment can run continuously, ensuring the continuity of sludge screening, greatly improving work efficiency, and allowing sludge to be processed at a stable rhythm and flow rate. This helps to improve the overall capacity of the sludge crushing, screening and fuel preparation unit.
[0027] It should be noted that the torsion spring 7 has a relatively large torque, so the two scrapers 8 are not easy to bend when cleaning the drum screen 1. The scraper 8 will only bend when it slides against the cleaning plate 9.
[0028] The fine sludge particles that pass through the sieve fall onto another fuel preparation device body 16 below the drum screen 1.
[0029] See Figure 1-2 A servo motor 12 is provided on one side of the drum screen 1, and a fixing ring 14 is fixedly installed at one end of the drum screen 1. The drive end of the servo motor 12 is fixedly connected to the fixing ring 14.
[0030] The servo motor 12 features high-precision speed control. By controlling the servo motor 12, the rotation speed of the drum screen 1 can be precisely set. This is crucial for the sludge screening process. Different types and properties of sludge may require different screening speeds to achieve optimal screening results. For example, for sludge with larger particles and lower viscosity, the rotation speed of the drum screen 1 can be appropriately increased, allowing the sludge to tumble and move more quickly within the drum screen 1, thereby improving screening efficiency. Conversely, for sludge with smaller particles and higher viscosity, a lower rotation speed can prevent excessive compression of the sludge on the screen mesh, thus preventing screen clogging.
[0031] Precise control of rotation speed helps improve the quality and efficiency of sludge screening, enabling sludge to pass through the screen holes more evenly and be screened into particles of the required size, thus providing more suitable sludge raw materials for subsequent fuel production.
[0032] See Figure 5 The mounting rod 2 is set inside the drum screen 1. A mounting frame is fixedly installed on one side of the drum screen 1. A first fixing block 13 is fixedly installed on the mounting frame. One end of the mounting rod 2 extends to the outside of the drum screen 1, and the extended end of the mounting rod 2 is fixedly installed on the first fixing block 13.
[0033] When the drum screen 1 is in operation, vibration and shaking may occur due to the movement of the internal sludge and the operation of the equipment itself. One end of the mounting rod 2 is fixed to the support frame, and the other end is fixed to the first external fixing block 13, acting like a stable "bracket" to limit excessive shaking of the drum screen 1. This not only reduces noise during equipment operation but also reduces damage to other components such as the motor and transmission device caused by vibration, extending the service life of the entire device.
[0034] See Figure 2 A support frame is provided below the drum screen 1. A fixing ring 14 is sleeved on the outside of the mounting rod 2. The fixing ring 14 is rotatably connected to the first fixing block 13. The other end of the mounting rod 2 extends to the outlet of the drum screen 1 and is bent and installed on the support frame at the bottom of the drum screen 1.
[0035] The first fixing block 13 and the support frame can provide two support points for the mounting rod 2, so that when the scraper 8 and the cleaning plate 9 are in contact and sliding connection, the mounting rod 2 will not easily vibrate, and the stability will be better.
[0036] See Figure 1 A limit ring is fixedly installed on the outer wall of the drum screen 1. A fixed frame is fixedly installed on the support frame, and a roller is fixedly installed on the fixed frame. The limit ring is set on the roller.
[0037] The drum screen 1 contacts the rollers via a limiting ring. When the drum screen 1 rotates, this contact generates rolling friction instead of sliding friction. The coefficient of rolling friction is much smaller than the coefficient of sliding friction, which greatly reduces the frictional force experienced by the drum screen 1 during rotation. This means that the power required to drive the drum screen 1 to rotate can be reduced, thereby reducing the energy consumption of the equipment and improving energy efficiency.
[0038] See Figure 1 The support frame is fixedly installed with a crushing device 15. Two crushing rollers are installed on the outer wall of the crushing device 15, and the bottom end of the crushing device 15 extends into the interior of the drum screen 1.
[0039] The crushing device 15 is mounted on a support frame, with its bottom end extending into the interior of the drum screen 1, and is equipped with two crushing rollers. This arrangement allows the sludge crushing and screening processes to be closely integrated. After entering the drum screen 1, the sludge can be immediately crushed by the crushing device 15, resulting in smaller sludge particles, which is more beneficial for the subsequent screening process.
[0040] A DC motor and a figure-eight drive belt work together to drive the crushing roller to rotate.
[0041] See Figure 1 A fuel preparation device body 16 is provided at the outlet of the drum screen 1. A heating device is provided on the top of the fuel preparation device body 16. A blowing device is fixedly installed on the top of the heating device. A stirring device is provided inside the fuel preparation device body 16.
[0042] The heating device, located at the top of the fuel preparation unit 16, directly heats the internal sludge, accelerating moisture evaporation and transforming it into a fuelable state. The air blowing device further enhances heat transfer and air circulation, promoting rapid moisture removal from the sludge. During the drying process, the combined effect of these two devices improves drying efficiency and shortens preparation time.
[0043] The stirring device operates inside the fuel preparation unit 16, ensuring that the sludge is evenly tumbled during the heating and drying process. On one hand, this ensures that all parts of the sludge are fully exposed to heat, preventing localized overheating or uneven drying and improving overall drying quality. On the other hand, during any additive mixing or chemical conversion processes, the stirring device allows the sludge to fully mix and react with the additives or internal components, resulting in a more complete and uniform fuel conversion process and improving the quality stability of the final fuel product.
[0044] See Figure 4 An L-shaped fixing block 10 is fixedly installed at one end of the slide rod 5, and the end of the fixing rod 6 away from the slide rod 5 is fixedly installed on the inner wall of the L-shaped fixing block 10. An elastic membrane layer 11 is fixedly installed between the L-shaped fixing block 10 and the scraper 8.
[0045] The sliding rod 5 and the fixed rod 6 are connected by an L-shaped fixing block 10, which makes the entire structure more stable. As an intermediate connector, the L-shaped fixing block 10 can effectively transmit and distribute the force between the sliding rod 5 and the fixed rod 6, avoiding loosening or damage to the components due to excessive local stress.
[0046] Preventing sludge from entering also protects the structural integrity and functional stability of the L-shaped fixing block 10 and the scraper 8. If sludge accumulates between them, it may corrode the surface of the torsion spring 7, affecting its mechanical properties.
Claims
1. A sludge crushing, screening, and fuel preparation device, comprising a drum screen (1) and a mounting rod (2), characterized in that: The fixing sleeve (3) is fixedly installed on the outer wall of the mounting rod (2); The slide bar (5) is slidably mounted on the fixed sleeve (3); The return spring (4) is fixedly installed between the fixed sleeve (3) and the slide rod (5); A fixing rod (6) is fixedly installed at one end of a sliding rod (5), and a torsion spring (7) is sleeved on the outer wall of the fixing rod (6); The scraper (8) is rotatably connected to the fixed rod (6), and the number of scrapers (8) is set to two. The cross-section of the scraper (8) is trapezoidal, and the acute angle formed by the inclined surface of the scraper (8) abuts against the inner wall of the drum screen (1). A torsion spring (7) is disposed between the two scrapers (8); Cleaning plates (9) are fixedly installed on the inner wall of the drum screen (1), and the quantity is set to multiple, with two forming a group.
2. The sludge crushing, screening, and fuel production apparatus as described in claim 1, characterized in that: A servo motor (12) is provided on one side of the drum screen (1), and a fixing ring (14) is fixedly installed at one end of the drum screen (1). The drive end of the servo motor (12) is fixedly connected to the fixing ring (14).
3. The sludge crushing, screening, and fuel preparation device as described in claim 2, characterized in that: The mounting rod (2) is set inside the drum screen (1). A mounting frame is fixedly installed on one side of the drum screen (1). A first fixing block (13) is fixedly installed on the mounting frame. One end of the mounting rod (2) extends to the outside of the drum screen (1). The extended end of the mounting rod (2) is fixedly installed on the first fixing block (13).
4. The sludge crushing, screening, and fuel preparation device as described in claim 3, characterized in that: A support frame is provided below the drum screen (1). The fixing ring (14) is sleeved on the outside of the mounting rod (2). The fixing ring (14) is rotatably connected to the first fixing block (13). The other end of the mounting rod (2) extends to the outlet of the drum screen (1) and is bent and installed on the support frame at the bottom of the drum screen (1).
5. The sludge crushing, screening, and fuel preparation apparatus as described in claim 4, characterized in that: The outer wall of the drum screen (1) is fixedly equipped with a limiting ring, a fixed frame is fixedly installed on the support frame, and a roller is fixedly installed on the fixed frame. The limiting ring is set on the roller.
6. The sludge crushing, screening, and fuel production apparatus as described in claim 5, characterized in that: A crushing device (15) is fixedly installed on the support frame. Two crushing rollers are installed on the outer wall of the crushing device (15). The bottom end of the crushing device (15) extends into the interior of the drum screen (1).
7. The sludge crushing, screening, and fuel preparation apparatus as described in claim 6, characterized in that: The outlet of the drum screen (1) is provided with a fuel preparation device body (16), the top of the fuel preparation device body (16) is provided with a heating device, the top of the heating device is fixedly installed with a blower, and the inside of the fuel preparation device body (16) is provided with a stirring device.
8. The sludge crushing, screening, and fuel preparation apparatus as described in claim 1, characterized in that: An L-shaped fixing block (10) is fixedly installed at one end of the slide rod (5), and the end of the fixing rod (6) away from the slide rod (5) is fixedly installed on the inner wall of the L-shaped fixing block (10). An elastic membrane layer (11) is fixedly installed between the L-shaped fixing block (10) and the scraper (8).