A municipal sewage upgrading and transformation device and its treatment process

Abstract

The present invention relates to the technical field of municipal sewage treatment equipment, and discloses a municipal sewage upgrading and transformation device and a treatment process thereof, comprising a sewage treatment tank, a bubble cutting assembly arranged inside the sewage treatment tank, and a foam crushing assembly arranged inside the sewage treatment tank, wherein the bubble cutting assembly comprises a straight rod fixedly connected to the bottom of the inner cavity of the sewage treatment tank, a sleeve movably sleeved on the outside of the straight rod, a connecting shaft movably connected to the outside of the sleeve at equal intervals, and crushing blades fixedly connected to the outside of the connecting shaft at equal intervals, wherein the foam crushing assembly comprises a bracket fixedly connected to the outside of the sleeve at equal intervals, a roller rotatably connected to the bracket, an active cavity fixedly connected to the outside of the roller at equal intervals, and a poking rod with one end slidably connected to the inside of the active cavity. The present invention effectively avoids the problem that the ejected gas easily gathers to form large bubbles, thereby affecting the mixing of sewage and air, thereby reducing the problem of the effect of sewage aeration treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal sewage treatment equipment, and in particular to a municipal sewage upgrading and transformation device and a treatment process thereof. Background Art

[0002] Municipal wastewater refers to wastewater generated within cities, including wastewater from households, businesses, factories, and other locations. Municipal wastewater typically consists of two types: domestic and industrial. Domestic wastewater refers to wastewater from households, businesses, and public facilities, including toilet flushing, washing, and bathing water. This wastewater contains harmful substances such as organic matter, nitrogen, phosphorus, and oil. If discharged directly into the environment without treatment, it can pollute water bodies and the ecological environment. Industrial wastewater refers to wastewater generated during industrial production. The composition and types of pollutants in industrial wastewater vary depending on the industry and production process. Industrial wastewater may contain harmful substances such as heavy metals, organic solvents, and acid and alkaline wastewater, posing potential risks to the environment and human health. To protect the environment and water resources, municipal wastewater must be treated before discharge or reuse. The municipal wastewater treatment process includes multiple steps, including primary treatment, biological treatment, and secondary treatment, to remove suspended solids, organic matter, and harmful substances from the wastewater. Treated municipal wastewater can be used for irrigation, industrial use, or discharged directly into water bodies to minimize negative impacts on the natural environment.

[0003] Municipal sewage upgrading refers to the technical upgrade and transformation of existing sewage treatment facilities to meet more stringent emission standards and environmental requirements. Specifically, upgrading includes the following aspects:

[0004] 1. Equipment Upgrade: Modify or replace sewage treatment equipment to improve treatment efficiency and capacity. For example, introduce more advanced sewage treatment processes, add treatment units, or expand treatment facilities.

[0005] 2. Process Improvement: Optimize wastewater treatment processes to improve wastewater removal efficiency and reduce pollutant emissions. For example, introduce more efficient biological treatment processes and add nitrogen and phosphorus removal processes.

[0006] 3. Upgrading Emission Standards: Adjust and upgrade the emission standards of sewage treatment plants in accordance with national and local regulations to ensure that the discharged water quality meets environmental requirements. This may involve improving sewage treatment efficiency and lowering emission concentration limits.

[0007] 4. Operational Management Improvement: Improve the operational management and monitoring systems of sewage treatment plants to improve operational efficiency and ensure stable operation of the facilities. This includes optimizing operational plans, strengthening equipment maintenance and monitoring, and improving operational management levels.

[0008] In the prior art, for example, Chinese invention patent publication number CN215627041U discloses an aerated biological filter device for upgrading municipal wastewater. This device connects the pipes via an inlet pipe, a connecting pipe, and an outlet pipe. Aeration holes facilitate the discharge of gas into the reservoir. The provision of sleeves and air holes ensures the proper functioning of the aeration holes and reduces clogging. During use, the gas ejected from the device tends to aggregate and form large bubbles as it rises. Aeration is intended to provide oxygen to the microorganisms in the biological filter to promote their ability to degrade organic matter. However, if the bubbles are too large, their surface area is relatively small, resulting in a reduced contact area with the water and lower oxygen transfer efficiency. This can affect microbial respiration, reducing treatment efficiency. Furthermore, if the bubbles are too large, they can carry surrounding suspended matter with them as they rise, causing it to be carried to the upper layers and not properly settled or removed. This can lead to reduced wastewater treatment effectiveness, particularly in subsequent sedimentation or filtration processes.

[0009] In summary, there is a need for a municipal sewage upgrading and transformation device that can treat large bubbles generated during aeration. Summary of the Invention

[0010] In order to solve the problem in the above-mentioned background technology that the ejected gas easily gathers to form large bubbles, which affects the mixing of sewage and air, thereby reducing the effect of sewage aeration treatment, the present invention provides a municipal sewage upgrading and transformation device and its treatment process. The device has an integrated structure for cutting bubbles, so that large bubbles are divided into small bubbles, which does not affect the mixing of sewage and air, thereby improving the effect of sewage aeration treatment.

[0011] The present invention is implemented by the following technical solution: a municipal sewage upgrading and transformation device, including a sewage treatment tank, a bubble cutting component arranged inside the sewage treatment tank, and a foam crushing component arranged inside the sewage treatment tank.

[0012] The bubble cutting assembly includes a straight rod fixedly connected to the bottom of the inner cavity of the sewage treatment tank, a sleeve movably mounted on the outside of the straight rod, a connecting shaft movably connected to the outside of the sleeve at equal intervals, crushing blades fixedly connected to the outside of the connecting shaft at equal intervals, a fixed plate fixedly installed on the top of the sewage treatment tank, and a motor fixedly installed on the top of the fixed plate and coaxially fixedly connected to the sleeve.

[0013] Among them, the bubble cutting component can increase the surface area of the bubbles in contact with the water body and improve the efficiency of oxygen transfer by cutting large bubbles into small bubbles. Small bubbles are easier to transfer oxygen in sewage, thereby effectively improving the respiration of microorganisms in the biological filter and promoting the degradation of organic matter. And after the bubble cutting component divides the large bubbles into small bubbles, the rising speed of the small bubbles is relatively slow, which can better maintain the sedimentation of suspended matter. This can effectively reduce the situation where suspended matter is carried to the upper layer and improve the effect of sewage treatment. In addition, because small bubbles have a larger surface area, the energy required for the same aeration volume is relatively small, thereby reducing energy consumption. The application of the bubble cutting component can reduce the energy consumption of the aeration system and achieve the purpose of energy conservation and emission reduction. In short, the use of the bubble cutting component can improve the efficiency and stability of sewage treatment, so that the treatment device can better adapt to different loads and water quality changes, and improve the overall treatment effect.

[0014] Furthermore, the pulverizing blades are used to cut bubbles. The sleeve rotates, simultaneously driving the pulverizing blades to rotate, and the pulverizing blades themselves can also rotate. The pulverizing blades' orbital and rotational design allows them to rapidly rotate within the sewage, creating high-speed vortices and effectively cutting bubbles. The rotation of the pulverizing blades quickly breaks large bubbles into smaller ones, increasing the bubble surface area and oxygen transfer efficiency. Furthermore, the pulverizing blade design can adapt to sewage treatment plants of varying sizes and types. The equidistant, circumferential arrangement of connecting shafts and the pulverizing blades fixed to them ensure uniform and comprehensive cutting action, making them suitable for sewage treatment tanks of varying shapes and sizes. The pulverizing blades are typically made of wear-resistant materials, such as stainless steel, for excellent wear and corrosion resistance. This ensures efficient cutting performance over extended periods of operation, reducing the need for maintenance and replacement. Since the pulverizing blades themselves rotate, their speed and direction can be adjusted according to actual conditions. This allows for flexible adjustment of the cutting effect to suit varying treatment requirements and water quality, further improving treatment efficiency.

[0015] Furthermore, the motor is located above the aeration tank, out of contact with water, effectively protecting it from erosion and corrosion from sewage. This extends the motor's service life, reduces maintenance and replacement frequency, and lowers operating costs. Furthermore, the motor's location above the biological aeration filter, away from the water, reduces the risk of electrical failure. This improves equipment safety and reduces the likelihood of accidents. Since the motor is out of water, maintenance and inspection are more convenient. Frequent entry into the sewage treatment tank for maintenance is unnecessary, reducing exposure to sewage for maintenance personnel and improving work efficiency and safety.

[0016] As a further improvement of the above scheme, the foam crushing assembly includes a bracket fixedly connected to the outside of the sleeve at equal intervals, a roller rotatably connected to the bracket, an active cavity fixedly connected to the outside of the roller at equal intervals, and a poking rod with one end slidingly connected to the inside of the active cavity, so as to facilitate the bursting of foam formed on the surface of the sewage to prevent it from hindering oxygen from entering the aeration tank mixed liquid and reducing the oxygenation efficiency.

[0017] The foam crushing component effectively punctures the foam formed on the sewage surface by the bubble cutting component. This quickly releases the bubbles, preventing their accumulation on the sewage surface and reducing their obstruction to the aeration system, thereby improving the efficiency of bubble utilization. Furthermore, during sewage treatment, foam generated by bubbles often overflows the treatment equipment, causing environmental pollution and equipment damage. The use of the foam crushing component effectively punctures the foam, reducing the occurrence of foam overflow and maintaining the stability of the sewage treatment process. Furthermore, by puncturing the foam, the foam crushing component increases the contact area between the bubbles and the water, promoting gas dissolution and mass transfer, and improving the efficiency of bubble utilization. This accelerates the degradation of organic matter and improves treatment efficiency. Specifically, the use of the foam crushing component reduces the energy consumption of the aeration system. After puncturing the foam, the released bubbles are more quickly absorbed by the water, reducing the gas supply to the aeration system, lowering energy consumption and achieving energy conservation and emission reduction.

[0018] As a further improvement of the above scheme, air outlet pipes are equidistantly arranged at the bottom of the inner cavity of the sewage treatment tank, aeration holes are equidistantly opened at the top of the air outlet pipes, and the air outlet pipes are connected by connecting pipes. An aeration blower is provided on one side of the sewage treatment tank, and the air outlet of the aeration blower is connected to the air outlet pipe on one side, so as to facilitate the aeration of the sewage inside the sewage treatment tank.

[0019] As a further improvement of the above solution, the outer fixed sleeve of the straight rod is provided with a bevel gear, and one end of the connecting shaft is coaxially fixed with a bevel gear and meshed with the bevel gear, so that the crushing blade can rotate while performing circumferential motion.

[0020] As a further improvement of the above solution, a sealing ring is provided at the movable connection between the straight rod and the sleeve to prevent sewage from entering the cavity between the straight rod and the sleeve.

[0021] As a further improvement of the above scheme, one side of the bracket is rotatably connected to a transmission shaft, the bottom end of the transmission shaft and one end of the roller are coaxially fixedly connected to bevel gear 2 and the bevel gears 2 are meshed together, the top end of the transmission shaft is coaxially fixedly connected to a gear plate, and the inner wall of the sewage treatment tank is fixedly installed with a gear ring and meshed with the gear plate, so that the roller can rotate while performing circumferential motion.

[0022] Among them, through the setting of the gear ring, the power of the motor can be transmitted to the foam crushing component, avoiding the setting of additional motor equipment and energy consumption. This can save energy and reduce operating costs. The setting of the gear ring allows the foam crushing component to be directly driven by the power of the bubble cutting component motor, reducing additional transmission systems and components. This can simplify the device structure and reduce the risk of failure and maintenance. In addition, through the transmission of the gear ring, the power of the motor can be directly transmitted to the foam crushing component, avoiding transmission loss and energy waste. This can improve energy utilization efficiency and enhance the operating efficiency of the foam crushing component. In particular, the setting of the gear ring can adjust the transmission ratio as needed, thereby realizing flexible adjustment of the rotation speed and direction of the foam crushing component, so that the foam crushing effect can be flexibly adjusted according to different treatment requirements and water quality characteristics, thereby improving treatment efficiency.

[0023] As a further improvement of the above solution, one end of the poking rod extending into the interior of the active cavity is fixedly connected to a limiting block, which can prevent the poking rod from being separated from the active cavity.

[0024] As a further improvement of the above solution, the length of the connecting shaft is slightly smaller than the radius of the sewage treatment tank, ensuring that the connecting shaft can smoothly perform circumferential movement.

[0025] As a further improvement of the above solution, the air outlet pipe is fixedly installed at the bottom of the inner cavity of the sewage treatment tank through a fixing hoop, thereby ensuring the stability of the pipe during aeration.

[0026] As a further improvement of the above solution, the end of the poking rod is designed with a conical structure, which makes it easy to puncture the foam.

[0027] The treatment process of the municipal sewage upgrading and transformation device of any of the above schemes includes the following steps:

[0028] S01. Aeration is conducted to the sewage treatment tank (1) through the outlet pipe (2);

[0029] S02. Starting the motor (105), causing the sleeve (102) to rotate, so that the crushing blade (104) performs bubble cutting work;

[0030] S03. After the sewage treatment is completed, stop the outlet pipe (2) to aerate the sewage treatment tank (1);

[0031] S04. Turn off the motor (105) to stop the rotation process of the sleeve (102).

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention drives the sleeve to rotate through a motor, and the sleeve drives the connecting shaft and the crushing blades to perform circumferential motion. The meshing action between the bevel gear disk and the bevel gear is utilized so that the crushing blades can rotate while performing circumferential motion. This not only facilitates the cutting of bubbles and enables them to be better mixed with sewage, but also can stir the sewage, further improving the mixing effect of sewage and air. At the same time, stirring the sewage can also prevent the suspended matter from sinking, so as to avoid its accumulation causing clogging of the aeration holes, and has strong practicality.

[0034] 2. In the process of aerating sewage, some surfactants in the sewage will cause foam after being disturbed in the aeration tank. The present invention will also drive the roller to make circumferential motion during the rotation of the sleeve, and utilize the meshing effect of the gear plate and the gear ring and the meshing effect between the bevel gears to enable the roller to rotate while making circumferential motion, thereby driving the poking rod to rotate to poke the foam on the surface of the sewage, effectively avoiding the problem of reducing the oxygenation efficiency due to the foam blocking the entry of oxygen into the aeration tank mixed liquid, and further ensuring the mixing of air and sewage. At the same time, the poking rod and the movable chamber are coordinated, so that when the poking rod rotates to the bottom of the roller, the poking rod will automatically extend downward under the action of gravity, thereby facilitating the poke of small foams that are too far away from the roller, ensuring the thoroughness of foam removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 for Figure 1 A in the middle is an enlarged structural diagram;

[0037] Figure 3 It is a longitudinal cross-sectional view of the connection structure of the sleeve, straight rod, bevel gear disc and bevel gear of the present invention;

[0038] Figure 4 It is a longitudinal cross-sectional diagram of the connection structure of the movable cavity, the poking rod and the limit block of the present invention.

[0039] Description of main symbols:

[0040] 1. Sewage treatment tank; 2. Exhaust pipe; 3. Limit block; 101. Straight rod; 102. Sleeve; 103. Connecting shaft; 104. Crushing blade; 105. Motor; 1001. Bevel gear disc; 1002. Bevel gear 1; 201. Bracket; 202. Roller; 203. Movable cavity; 204. Poking rod; 2001. Transmission shaft; 2002. Bevel gear 2; 2003. Gear disc; 2004. Gear ring. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] Example 1:

[0043] Please combine Figure 1-4 A municipal sewage upgrading and transformation device of the present embodiment includes a sewage treatment tank 1, a bubble cutting component arranged inside the sewage treatment tank 1, and a foam crushing component arranged inside the sewage treatment tank 1. Air outlet pipes 2 are equidistantly arranged at the bottom of the inner cavity of the sewage treatment tank 1, and aeration holes are equidistantly opened on the top of the air outlet pipes 2. The air outlet pipes 2 are connected by connecting pipes. An aeration blower is provided on one side of the sewage treatment tank 1, and the air outlet of the aeration blower is connected to the air outlet pipe 2 on one side, which is convenient for aerating the sewage inside the sewage treatment tank 1. The air outlet pipe 2 is fixedly installed at the bottom of the inner cavity of the sewage treatment tank 1 by a fixing hoop, thereby ensuring the stability of the pipeline during aeration.

[0044] The bubble cutting assembly includes a straight rod 101 fixedly connected to the bottom of the inner cavity of the sewage treatment tank 1, a sleeve 102 movably sleeved on the outside of the straight rod 101, a connecting shaft 103 equidistantly circumferentially movably connected to the outside of the sleeve 102, a crushing blade 104 equidistantly circumferentially fixedly connected to the outside of the connecting shaft 103, a fixed plate fixedly mounted on the top of the sewage treatment tank 1 and a motor 105 fixedly mounted on the top of the fixed plate and coaxially fixedly connected to the sleeve 102, the outer fixed sleeve of the straight rod 101 is provided with a bevel gear 1001, one end of the connecting shaft 103 is coaxially fixedly connected to a bevel gear 1002 and meshed with the bevel gear 1001, so that the crushing blade 104 can rotate while performing circumferential movement, and a sealing ring is added at the movable connection between the straight rod 101 and the sleeve 102 to prevent sewage from entering the cavity between the straight rod 101 and the sleeve 102. The length of the connecting shaft 103 is slightly smaller than the radius of the sewage treatment tank 1, ensuring that the connecting shaft 103 can perform circumferential movement smoothly.

[0045] The foam crushing assembly includes a bracket 201 equidistantly and circumferentially fixedly connected to the outside of the sleeve 102, a roller 202 rotatably connected to the bracket 201, an active chamber 203 equidistantly and circumferentially fixedly connected to the outside of the roller 202, and a poking rod 204 with one end slidingly connected to the inside of the active chamber 203, so as to facilitate the bursting of foam formed on the surface of the sewage to prevent it from hindering the entry of oxygen into the aeration tank mixed liquid and reducing the oxygenation efficiency. A transmission shaft 2001 is rotatably connected to one side of the bracket 201, and the bottom end of the transmission shaft 2001 and one end of the roller 202 are coaxially fixedly connected to a bevel gear 2002, and the bevel gear 2002 is meshed with each other. The top of the transmission shaft 2001 is coaxially fixedly connected to a gear disk 2003, and a gear ring 2004 is fixedly installed on the inner wall of the sewage treatment tank 1 and is meshed with the gear disk 2003, so that the roller 202 can rotate while performing circumferential motion. The end of the poking rod 204 is designed with a conical structure, which is convenient for easily bursting the foam.

[0046] The implementation principle of a municipal sewage upgrading and transformation device in the embodiment of the present application is as follows: start the motor 105, and the motor 105 drives the sleeve 102 to rotate, and the sleeve 102 drives the connecting shaft 103 and the crushing blade 104 to make a circumferential motion, and utilizes the meshing action between the bevel gear disk 1001 and the bevel gear 1002 to enable the crushing blade 104 to rotate while making a circumferential motion, which not only facilitates the cutting of bubbles and makes them better mixed with sewage, but also can stir the sewage, further improving the mixing effect of sewage and air. At the same time, stirring the sewage can also prevent the suspended matter from sinking to avoid its accumulation causing clogging of the aeration holes. The motor 105 drives the sleeve 102 to rotate while At the same time, it will also drive the roller 202 to make circumferential motion, and utilize the meshing action of the gear plate 2003 and the gear ring 2004 as well as the meshing action between the bevel gear 2002, so that the roller 202 can rotate while making circumferential motion, thereby driving the poking rod 204 to rotate to poke the foam on the surface of the sewage, effectively avoiding the problem of reducing the oxygenation efficiency due to the foam blocking the oxygen from entering the aeration tank mixed liquid, and utilizing the movable coordination of the poking rod 204 and the movable chamber 203, so that when the poking rod 204 rotates to the bottom of the roller 202, the poking rod 204 will automatically extend downward under the action of gravity, thereby facilitating the poke of small foams that are too far away from the roller 202, thereby ensuring the thoroughness of the foam removal.

[0047] Example 2:

[0048] This embodiment is further improved on the basis of the embodiment 1 in that one end of the poking rod 204 extending into the active cavity 203 is fixedly connected to the limiting block 3 to prevent the poking rod 204 from being separated from the active cavity 203 .

[0049] Example 3:

[0050] In this embodiment, the processing process of any one of the above embodiments 1 and 2 includes the following steps:

[0051] S01. Aeration is carried out through the outlet pipe 2 to the sewage treatment tank 1;

[0052] S02 starts the motor 105, so that the sleeve 102 rotates, so that the crushing blade 104 performs bubble cutting work;

[0053] S03. After the sewage treatment is completed, stop the outlet pipe 2 to the sewage treatment tank 1 aeration;

[0054] S04. Turn off the motor 105 to stop the rotation of the sleeve 102.

[0055] The process of shutting down the motor 105 in step S04 needs to be performed after the process of stopping the air outlet pipe 2 in step S03, so that the bubbles remaining in the pool after stopping the air outlet pipe 2 can be further broken to avoid insufficient aeration.

[0056] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A municipal sewage upgrading and transformation device, characterized in that: It comprises a sewage treatment tank (1), a bubble cutting component arranged inside the sewage treatment tank (1), and a foam crushing component arranged inside the sewage treatment tank (1); The bubble cutting assembly comprises a straight rod (101) fixedly connected to the bottom of the inner cavity of the sewage treatment tank (1), a sleeve (102) movably sleeved on the outside of the straight rod (101), a connecting shaft (103) movably connected to the outside of the sleeve (102) at equal intervals, a crushing blade (104) fixedly connected to the outside of the connecting shaft (103) at equal intervals, a fixing plate fixedly mounted on the top of the sewage treatment tank (1), and an electric motor fixedly mounted on the top of the fixing plate and coaxially fixedly connected to the sleeve (102). The foam crushing assembly comprises a bracket (201) fixedly connected to the outside of the sleeve (102) at equal intervals, a roller (202) rotatably connected to the bracket (201), an active cavity (203) fixedly connected to the outside of the roller (202) at equal intervals, and a poking rod (204) with one end slidably connected to the inside of the active cavity (203); the bottom of the inner cavity of the sewage treatment tank (1) is provided with an air outlet pipe (2) at equal intervals, and the top of the air outlet pipe (2) is provided with an aeration nozzle at equal intervals. The outlet pipes (2) are connected to each other through a connecting pipe. An aeration blower is provided on one side of the sewage treatment tank (1), and the outlet of the aeration blower is connected to the outlet pipe (2) on one side. The outer fixed sleeve of the straight rod (101) is provided with a bevel gear (1001). One end of the connecting shaft (103) is coaxially fixedly connected to a bevel gear 1 (1002) and meshed with the bevel gear (1001). The movable connection between the straight rod (101) and the sleeve (102) is provided with a sealing Sealing ring; one side of the bracket (201) is rotatably connected to a transmission shaft (2001); the bottom end of the transmission shaft (2001) and one end of the roller (202) are coaxially fixedly connected to a second bevel gear (2002), and the second bevel gear (2002) is meshingly connected; the top end of the transmission shaft (2001) is coaxially fixedly connected to a gear plate (2003); and a gear ring (2004) is fixedly installed on the inner wall of the sewage treatment tank (1) and meshingly connected to the gear plate (2003).

2. A municipal sewage upgrading and transformation device according to claim 1, characterized in that: One end of the poking rod (204) extending into the interior of the active cavity (203) is fixedly connected to the limiting block (3).

3. A municipal sewage upgrading and transformation device according to claim 1, characterized in that: The air outlet pipe (2) is fixedly mounted on the bottom of the inner cavity of the sewage treatment tank (1) via a fixing hoop.

4. A municipal sewage upgrading and transformation device according to claim 1, characterized in that: The end of the poking rod (204) is designed as a conical structure.

5. A treatment process for the municipal sewage upgrading and transformation device according to any one of claims 1 to 4, characterized in that: The steps include: S01. Aerating the sewage treatment tank (1) through the outlet pipe (2); S02. Starting the motor (105) to rotate the sleeve (102) so that the crushing blade (104) performs bubble cutting; S03. After the sewage treatment is completed, the outlet pipe (2) is stopped from aerating the sewage treatment tank (1); S04. Turn off the motor (105) to stop the rotation of the sleeve (102).

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