Biochemical sludge treatment device

Abstract

The utility model belongs to the technical field of sludge treatment, and discloses a biochemical sludge treatment device which comprises a case and a rack arranged in the case, a roller assembly is arranged on the rack and comprises a roller, a screen drum and a motor used for driving the screen drum to rotate, and the screen drum is rotationally arranged in the roller; the first cam is coaxially and fixedly connected with the screen drum; the second cam is arranged on the rack, the second cam is matched with the first cam, the first cam is used for intermittently colliding with the second cam, the motor is an adjustable-speed motor and is electrically connected with a controller, the output end of the motor is coaxially connected with a driving wheel, the screen drum is coaxially connected with a driven wheel, and the driven wheel is coaxially connected with the motor. The driving wheel and the driven wheel are in transmission connection through a belt; according to the scheme, the problem that sludge adheres to the inner wall in the drying process in the roller is solved through vibration of the two matched cams, and the problem that sludge adheres to the inner wall of the roller easily in the prior art is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge treatment, and specifically relates to a biochemical sludge treatment device. Background Art

[0002] Referring to the document with the existing publication (announcement) number CN118006367A, a biochemical sludge treatment system is disclosed. With the rapid development of industrialization and urbanization, the amount of biochemical sludge generated in the sewage treatment process is increasing. Biochemical sludge contains a large number of microorganisms, organic and inorganic particles, and impurities and salts enriched in the sewage treatment process. If not properly treated, the toxic and harmful substances in these sludges will pose a serious threat to the environment and human health.

[0003] Before sludge is mixed with coal for power generation, it is usually necessary to dry the sludge. This is because the original sludge has a high water content (usually 70%-90%). Direct mixing will not only absorb a large amount of combustion heat and reduce boiler efficiency, but may also affect combustion stability. Through drying, the water content of the sludge can be effectively reduced to a ratio more suitable for mixing (less than 30%). This not only improves the combustion efficiency, but also ensures that the sludge and coal are mixed more evenly, promotes the stability of the combustion process, and reduces the amount of flue gas and pollutant emissions, achieving more environmentally friendly and efficient resource utilization. Therefore, sludge drying is a pretreatment step for achieving sludge and coal mixed power generation.

[0004] Referring to the document with the existing publication (announcement) number CN115108704A, a drum-type sludge dryer is disclosed. Through the cooperation of the air expansion column and the guide groove, the injected hot air is diffused and directly impacts the inner surface of the drum for heat transfer. With the cooperation of the arc pressure plate, the sludge is compacted to the inner surface of the drum. The hot air and the arc pressure plate dry the compacted sludge surface, and under the action of arc scraper one, arc scraper two, arc scraper three and scraper, the compacted sludge is scraped layer by layer to dry the inside of the sludge. In the process of continuous compaction and scraping, the sludge is dried by both compression and heat transfer, and also dried by scraping to reduce the size of the block sludge. The injected hot air can be fully utilized on the inner surface of the drum. In the existing equipment, the hot air passing through the top of the drum cannot be utilized, and the drying effect is better.

[0005] The above-mentioned device dries the sludge by means of a drum with the aid of hot air. However, due to the high moisture content and viscosity of the sludge, when the sludge is placed in the drum dryer, as the temperature rises and the water evaporates, the viscous components in the sludge will gradually become more viscous and begin to solidify, and easily adhere to the inner wall of the drum. At the same time, due to the capillary action and surface tension between the sludge particles, the migration of water during the drying process may cause the particles to rearrange, increasing the adhesion between the sludge and the contact surface of the drum. In addition, the high temperature environment inside the drum dryer will accelerate the evaporation of water in the sludge, and the evaporation rate may exceed the rate at which the water migrates to the outside of the drum, causing the water to re-condense on the surface of the drum, forming a layer of wet sludge film, which is easy to adhere to the surface of the drum. As the drying process proceeds, the solid particles in the sludge may accumulate on the surface of the drum, forming a dirt layer that is difficult to remove. Utility Model Content

[0006] The purpose of this scheme is to provide a biochemical sludge treatment device to solve the problem in the prior art that sludge easily adheres to the inner wall of the drum.

[0007] In order to achieve the above-mentioned object, the present invention provides a biochemical sludge treatment device, comprising a chassis and a frame arranged in the chassis, a drum assembly is arranged on the frame, the drum assembly comprises a drum, a screen drum and a motor for driving the screen drum to rotate, the screen drum is rotatably arranged in the drum; and further comprising:

[0008] a first cam, wherein the first cam is coaxially fixedly connected to the screen drum;

[0009] The second cam is arranged on the frame, the second cam is matched with the first cam, and the first cam is used for intermittently colliding with the second cam.

[0010] The principle of this scheme is that in order to achieve the shedding of the sludge adhering to the inner wall of the screen drum, two mutually cooperating cams, namely the first cam and the second cam, are provided in the device. The first cam is coaxial with the screen drum and fixedly connected, so that the screen drum drives the first cam to rotate synchronously while rotating; the second cam is provided on the frame and cooperates with the first cam. When the motor drives the screen drum to rotate, the first cam also rotates, and generates mechanical vibration through intermittent collision with the second cam. The vibration force generated by the periodic collision destroys the adhesion between the sludge and the inner wall of the screen drum, so that the sludge adhering to the inner wall of the screen drum can be loosened and fall off.

[0011] The effects of this solution are as follows: (1) The problem of sludge adhering to the inner wall during the drying process in the drum is solved by vibrating two coordinated cams. Compared with the prior art, this solution adopts a simple mechanical structure, generates vibrations through the intermittent collision of the cam, effectively promotes the detachment of the adhered sludge, reduces the need for complex transmission systems or additional vibration generators, and reduces manufacturing and maintenance costs. (2) Since the device can periodically remove the sludge on the inner wall of the screen drum, it reduces the equipment efficiency reduction and additional cleaning work caused by sludge accumulation. (3) Compared with the prior art that cleans the screen drum after the drying process is completed, this solution can avoid excessive accumulation and hardening of sludge on the inner wall of the screen drum by rotating the screen drum in the middle and late stages of drying, thereby avoiding the increase in equipment movement resistance caused by sludge adhesion. Secondly, timely cleaning is conducive to maintaining uniform heating of the screen drum surface, promoting uniform drying of sludge in the screen drum, and improving drying quality. Furthermore, by rotating and cleaning the screen drum in the later stage, the workload and time of cleaning after drying can be reduced, because the sludge is easier to fall off before it is completely dried and hardened, and the wear on the screen drum caused by long-term operation can also be reduced.

[0012] Furthermore, the motor is an adjustable speed motor, the motor is electrically connected to a controller, the output end of the motor is coaxially connected to a driving wheel, the screen drum is coaxially connected to a driven wheel, and the driving wheel and the driven wheel are connected via a belt drive.

[0013] The principle and effect of this solution are as follows: (1) By adopting an adjustable speed motor and electrically connecting it to the controller, the rotation speed of the screen drum can be controlled, and the rotation speed of the screen drum can be adjusted in real time according to time and the drying process. (2) The driving wheel and the driven wheel are connected by a belt drive, which can make the power transmission smoother and provide additional buffer, reduce the use of reducers, and help reduce the wear between the driving wheel and the driven wheel caused by speed changes or load fluctuations.

[0014] Furthermore, a cylinder is provided on the frame, a piston rod of the cylinder is coaxially fixedly connected to the second cam, and the cylinder is electrically connected to the controller.

[0015] The principle and effect of this scheme are as follows: (1) During the drying process of the sludge on the screen drum, the rotation speed of the screen drum needs to be increased in the early stage due to the extremely high water content of the sludge. This is to generate greater centrifugal force through the faster rotation of the screen drum, so as to throw the sewage in the sludge out of the screen drum. The sludge in this process is relatively thin and not easy to adhere to the inner wall of the screen drum. At this time, it is not necessary to vibrate the screen drum, and vibrating the screen drum at this time will affect the rotation speed of the screen drum and cause mechanical equipment failure. As the screen drum continues to rotate, the moisture content gradually decreases, and the sludge becomes more and more viscous, especially after hot air is introduced into the screen drum in the later stage, the viscosity of the sludge is greatly increased, and the sludge will easily adhere to the inner wall of the screen drum. This is because after the moisture content decreases, the solid particles and gelling substances in the sludge begin to adhere to each other, forming a layer of highly viscous film, and the effect of hot air further promotes the adhesion phenomenon. Therefore, in the middle and late stages of drying, in order to prevent the sludge from adhering to and clogging the screen drum, it is necessary to vibrate the screen drum. (2) The program pre-stored in the controller starts the cylinder according to the drying time. When the drying time reaches the preset value, the controller controls the cylinder to start, so that the cylinder piston rod extends, thereby driving the second cam to extend. After the second cam extends, the first cam will rotate to collide with it, thereby causing the screen drum to vibrate and vibrate to clean the sludge adhering to the inner wall of the screen drum. (3) By controlling the vibration time of the screen drum, in the early stage of drying, the centrifugal force generated by the high-speed rotation of the screen drum helps to quickly throw out the moisture in the sludge, and at this time, the vibration of the screen drum is avoided, ensuring the stability of the rotation speed and avoiding mechanical equipment failure. Secondly, as the moisture content of the sludge decreases and the viscosity increases, especially in the middle and late stages of drying, the cylinder is started in time through the preset program of the controller, so that the second cam and the first cam collide intermittently, generating vibration, effectively removing the adhering sludge on the inner wall of the screen drum and avoiding clogging of the screen holes.

[0016] Furthermore, a compression spring is provided below the second cam.

[0017] The principle and effect of this solution is that the compression spring is provided to provide a buffer for the second cam when it is vibrated.

[0018] Furthermore, a slide groove is provided on the frame, and the second cam is slidably connected to the slide groove.

[0019] The principle and effect of this solution are that the slide groove provides positioning and guiding functions for the movement of the cam.

[0020] Furthermore, the roller is connected to a tension spring, a free end of the tension spring is connected to a shock absorber, and the shock absorber is connected to the frame.

[0021] The principle and effect of this solution are as follows: Since the vibration generated by the screen drum is bound to be transmitted to the outer drum, in order to avoid excessive amplitude of the drum, tension springs and shock absorbers are provided to reduce the energy transmitted from the screen drum vibration to the drum, avoid excessive amplitude of the drum, and thus reduce equipment structural fatigue caused by vibration.

[0022] Furthermore, it also includes a fan arranged in the chassis, the fan is connected to the screen drum through a rotary joint and a pipeline, a one-way check valve is arranged on the pipeline, and the fan is electrically connected to the controller.

[0023] The principle and effect of this scheme are as follows: (1) By sending hot air directly into the screen drum through the fan, the evaporation of water in the sludge can be accelerated and the drying cycle can be shortened. (2) By electrically connecting the fan to the controller, the controller controls the temperature of the fan hot air according to the drying time. In the early stage of the screen drum rotation, there is no need to introduce hot air into the screen drum. In the middle and late stages, hot air is introduced into the screen drum, and the temperature of the hot air gradually decreases from high to low. (3) The setting of the one-way check valve ensures the directional flow of hot air and prevents the backflow of pollutants into the fan.

[0024] Furthermore, the temperature generated by the fan is 60 degrees to 430 degrees.

[0025] The principle and effect of this solution are as follows: the temperature range generated by the fan is from 60 degrees to 430 degrees, covering multiple stages of the sludge drying process. In the early stage, gentle heating at a lower temperature (such as 60 degrees) helps to slowly increase the sludge temperature and gradually evaporate the surface moisture. As the drying progresses, the temperature is gradually increased to the medium temperature zone (such as 150 degrees to 250 degrees) to accelerate the separation of internal bound water. At this time, the sludge viscosity decreases and the drying rate is accelerated. Entering the high temperature stage (close to 430 degrees), the evaporation of residual water is completed quickly, effectively shortening the drying cycle and reducing energy consumption.

[0026] Furthermore, the drum is provided with a sewage outlet, and a sewage bucket is provided below the sewage outlet.

[0027] The principle and effect of this solution is to quickly remove moisture, mud or other impurities inside the drum through the sewage outlet.

[0028] Furthermore, a stirring rod is provided in the sieve cylinder, a scraper is provided on the stirring rod, and the stirring rod is coaxially fixedly connected to the sieve cylinder.

[0029] The principle and effect of this solution are that when the screen drum rotates, it not only uses centrifugal force to effectively promote the separation of water in the sludge, but also causes the scraper to extend outward, thereby scraping off the sticky sludge layer attached to the inner wall of the screen drum, thereby avoiding clogging of the screen holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1The structure diagram of the biochemical sludge treatment device of the utility model is shown in FIG. Figure 1 ;

[0031] Figure 2 The structure diagram of the biochemical sludge treatment device of the utility model is shown in FIG. Figure 2 ;

[0032] Figure 3 The structure of the roller assembly of the utility model is shown in FIG. Figure 1 ;

[0033] Figure 4 The structure of the roller assembly of the utility model is shown in FIG. Figure 2 ;

[0034] Figure 5 The structure of the roller assembly of the utility model is shown in FIG. Figure 3 ;

[0035] Figure 6 The structure of the first cam and the second cam of the utility model is shown in FIG. Figure 1 ;

[0036] Figure 7 The structure of the first cam and the second cam of the utility model is shown in FIG. Figure 2 ;

[0037] Figure 8 The structure of the first cam and the second cam of the utility model is shown in FIG. Figure 3 ;

[0038] Fig. 9 for Figure 8 Magnified view at A in the middle.

[0039] The names of corresponding marks in the accompanying drawings are: chassis 1, frame 2, drum assembly 3, drum 31, screen drum 32, motor 33, controller 34, sewage bucket 35, first cam 4, second cam 5, cylinder 6, compression spring 7, tension spring 8, shock absorber 9, fan 10. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the concept and technical effects of the utility model in combination with the embodiments, so as to fully understand the purpose, features and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model:

[0041] Example:

[0042] See also Figure 1-Figure 2A biochemical sludge treatment device includes a chassis 1 and a frame 2 built inside the chassis 1. A fan 10 is arranged at the bottom of the chassis 1. The fan 10 is connected to the screen drum 32 through a rotary joint and a pipeline. The hot air is directly sent into the screen drum through the fan 10, which can accelerate the evaporation of water in the sludge. The temperature generated by the fan 10 is 60 degrees to 430 degrees. The temperature range generated by the fan 10 is from 60 degrees to 430 degrees, covering multiple stages of the sludge drying process. In the early stage, gentle heating in a lower temperature section (such as 60 degrees) helps to slowly increase the sludge temperature and gradually evaporate the surface moisture. As the drying process progresses, the temperature is gradually increased to the medium temperature zone (such as 150 degrees to 250 degrees), accelerating the separation of internal bound water. At this time, the sludge viscosity is reduced and the drying rate is accelerated. Entering the high temperature stage (close to 430 degrees), the evaporation of residual water is quickly completed, effectively shortening the drying cycle and reducing energy consumption.

[0043] See also Figure 3-Figure 5 The frame 2 is provided with a drum assembly 3, which includes a drum 31, a screen drum 32 and a motor 33 for driving the screen drum 32 to rotate. The drum 31 is provided on the frame 2, and is connected with a tension spring 8. The free end of the tension spring 8 is connected with a shock absorber 9, and the shock absorber 9 is connected with the frame 2. Since the vibration generated by the screen drum 32 is bound to be transmitted to the outer drum 31, in order to avoid the excessive amplitude of the drum 31, the tension spring 8 and the shock absorber 9 are provided to reduce the energy transmitted from the vibration of the screen drum 32 to the drum 31, so as to avoid the excessive amplitude of the drum 31, thereby reducing the fatigue of the equipment structure caused by vibration. The screen drum 32 is rotatably arranged in the drum 31, and one end of the screen drum 32 is rotatably connected with the chassis 1 through a bearing. The motor 33 is provided on the frame 2, and the motor 33 is an adjustable speed motor. The motor 33 is electrically connected with a controller 34. The output end of the motor 33 is coaxially connected with a driving wheel, and the screen drum 32 is coaxially connected with a driven wheel, and the driving wheel and the driven wheel are connected by a belt drive. By using an adjustable speed motor, such as a servo motor, and electrically connecting it to the controller 34 (PID controller), the rotation speed of the screen drum 32 can be controlled, and the rotation speed of the screen drum can be adjusted in real time according to time and the drying process. The driving wheel and the driven wheel are connected by a belt drive, which can make the power transmission smoother, provide additional buffer, reduce the use of reducers, and help reduce the wear between the driving wheel and the driven wheel caused by speed changes or load fluctuations.

[0044] See also Figure 6-Figure 8, the screen drum 32 is coaxially connected with the first cam 4, the frame 1 is provided with a cylinder 6, the piston rod of the cylinder 6 is coaxially connected with the second cam 5 matched with the first cam 4, and a compression spring 7 is provided below the second cam 5 to provide a buffering effect for the second cam 5 when it is vibrated. The cylinder 6 is electrically connected to the controller 34, and the first cam 4 will intermittently collide with the second cam when it rotates. By setting two mutually matching cams, namely the first cam 4 and the second cam 5. The first cam 4 is coaxial with the screen drum 32 and fixedly connected, so that the screen drum 32 drives the first cam 4 to rotate synchronously while rotating; the second cam 5 is set on the frame and cooperates with the first cam 4. When the motor 33 drives the screen drum 32 to rotate, the first cam 4 also rotates, and generates mechanical vibration through its intermittent collision with the second cam 5. The vibration force generated by the periodic collision destroys the adhesion between the sludge and the inner wall of the screen drum 32, so that the sludge adhered to the inner wall of the screen drum 32 can be loosened and dropped.

[0045] During the drying process of the sludge in the sieve drum 32, the water content of the sludge is extremely high in the early stage, so it is necessary to increase the rotation speed of the sieve drum 32. This is to generate a greater centrifugal force through the faster rotation of the sieve drum 32, so as to throw the sewage in the sludge out of the sieve drum 32. The sludge in this process is relatively thin and not easy to adhere to the inner wall of the sieve drum 32. At this time, it is not necessary to vibrate the sieve drum 32, and vibrating the sieve drum 32 at this time will affect the rotation speed of the sieve drum and cause mechanical equipment failure. As the sieve drum 32 continues to rotate, the water content gradually decreases, and the sludge becomes more and more viscous, especially after hot air is introduced into the sieve drum 32 in the later stage, the viscosity of the sludge is greatly increased, and the sludge will easily adhere to the inner wall of the sieve drum 32. This is because after the water content decreases, the solid particles and gelling substances in the sludge begin to adhere to each other, forming a layer of highly viscous film, and the effect of hot air further promotes the adhesion phenomenon. Therefore, in the middle and late stages of drying, in order to prevent the sludge from adhering to and blocking the sieve drum, it is necessary to vibrate the sieve drum 32. The cylinder 6 is started according to the drying time through the program pre-stored in the controller 34. When the drying time reaches the preset value, the controller 34 controls the cylinder 6 to start, so that the piston rod of the cylinder 6 extends, thereby driving the second cam 5 to extend. When the second cam 5 extends, the first cam 4 will rotate to collide with it, so that the screen drum 32 vibrates, and the sludge adhering to the inner wall of the screen drum 32 is vibrated and cleaned.

[0046] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A biochemical sludge treatment device, comprising a chassis (1) and a frame (2) arranged in the chassis (1), a drum assembly (3) being arranged on the frame (2), the drum assembly (3) comprising a drum (31), a screen drum (32) and a motor (33) for driving the screen drum (32) to rotate, the screen drum (32) being rotatably arranged in the drum (31); characterized in that: Also includes: A first cam (4), the first cam (4) being coaxially fixedly connected to the screen drum (32); A second cam (5), wherein the second cam (5) is arranged on the frame, the second cam (5) is arranged in cooperation with the first cam (4), and the first cam (4) is used to intermittently collide with the second cam (5).

2. The biochemical sludge treatment device according to claim 1, characterized in that: The motor (33) is an adjustable speed motor. The motor (33) is electrically connected to a controller (34). The output end of the motor (33) is coaxially connected to a driving wheel. The screen drum (32) is coaxially connected to a driven wheel. The driving wheel and the driven wheel are connected via a belt transmission.

3. The biochemical sludge treatment device according to claim 1, characterized in that: A cylinder (6) is provided on the frame (2); a piston rod of the cylinder (6) is coaxially fixedly connected to the second cam (5); and the cylinder (6) is electrically connected to a controller (34).

4. The biochemical sludge treatment device according to claim 1, characterized in that: A compression spring (7) is provided below the second cam (5).

5. The biochemical sludge treatment device according to claim 3, characterized in that: The frame (2) is provided with a slide groove, and the second cam (5) is slidably connected to the slide groove.

6. The biochemical sludge treatment device according to claim 1, characterized in that: The roller (31) is connected to a tension spring (8), the free end of the tension spring (8) is connected to a shock absorber (9), and the shock absorber (9) is connected to the frame (2).

7. The biochemical sludge treatment device according to claim 1, characterized in that: It also includes a fan (10) disposed in the chassis (1), the fan (10) being connected to the screen drum (32) via a rotary joint and a pipeline, the pipeline being provided with a one-way check valve, and the fan (10) being electrically connected to a controller (34).

8. The biochemical sludge treatment device according to claim 7, characterized in that: The temperature generated by the fan (10) is 60 degrees to 430 degrees.

9. The biochemical sludge treatment device according to claim 1, characterized in that: The drum (31) is provided with a sewage outlet, and a sewage hopper (35) is provided below the sewage outlet.

10. The biochemical sludge treatment device according to claim 1, characterized in that: A stirring rod is provided in the sieve drum (32), a scraper is provided on the stirring rod, and the stirring rod is coaxially fixedly connected to the sieve drum (32).

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