Automatic residue separating device

Abstract

The utility model discloses an automatic residue separating device, which belongs to the technical field of residue separation and comprises a lifter, a conveying belt is arranged in the lifter, a material loading groove is arranged on the surface of the conveying belt, partition plates are distributed on the material loading groove at intervals along the conveying direction of the conveying belt, and a plurality of arc openings are arranged on two sides of the material loading groove. According to the scheme, the conveying belt in the lifter can carry away residues discharged from the liquid storage tank in time, the situation that a filter of the liquid storage tank is blocked due to the fact that the residues are accumulated in the residue well is avoided, the material carrying groove in the conveying belt can contain the residues, and the partition plate and the arc opening in the material carrying groove can better bear the material residues. According to the scheme, solid residues in the residue well in polyester production can be separated out in time, and the residues are prevented from blocking the filter; and backflow design and sealing treatment are further achieved, loss of separation liquid in the residue well and the lifter can be reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a solid-liquid separation device, more specifically, it relates to an automatic residue separation device. Background Art

[0002] During current polyester production, a certain amount of residue is generated in the vacuum system, causing it to malfunction. To address this, a residue filter is used to remove the residue from the system. However, due to design flaws in the filter, it must be regularly removed and cleaned during operation. The valve on the filter may not fully close due to material being stuck. Continuing with the next step could damage the vacuum system, resulting in serious production accidents.

[0003] For example: Chinese patent announcement number CN111804040A, announcement date October 23, 2020, invention name is a residue separation device, the application discloses a separation device, including a fixed barrel body, supported by a support frame, connected to a water inlet pipe at the top and a drainage port at the bottom; a winged rotating cylinder, rotatably arranged inside the fixed barrel body, coaxially connected to a drainage cylinder at the bottom, the drainage cylinder is sealed and rotated to extend out of the bottom of the fixed barrel body; a driving member, fixedly mounted on the support frame or the fixed barrel body through a mounting frame, and drives the winged rotating cylinder to rotate through a transmission member; wherein, the winged rotating cylinder is a conical cylindrical structure with a thick middle and thin ends, and a number of through holes are opened on it; the bottom of the drainage cylinder is rotatably connected to a drainage pipe. The winged rotating cylinder is used to rotate at high speed to inhale gas and liquid, which reduces the power consumption of water transportation. The winged rotating cylinder is used to rotate at high speed and separate from water and residue. The vortex drives the residue away from the outer surface of the winged rotating cylinder, avoiding the residue clogging the through holes and ensuring the smoothness of filtration. However, this solution cannot be applied to the continuous separation of residues in polyester production and is prone to filter clogging. Utility Model Content

[0004] The utility model overcomes the problem of material jamming in polyester production filtration and provides an automatic residue separation device. This solution can timely separate solid residues in the residue well in polyester production to prevent the residues from clogging the filter.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an automatic residue separation device comprising an elevator, a conveyor belt disposed within the elevator, a material loading trough on the surface of the conveyor belt, partitions spaced along the conveying direction of the conveyor belt, and a plurality of arc-shaped openings on both sides of the material loading trough. In this solution, the conveyor belt within the elevator can promptly transport the residue discharged from the liquid storage tank, preventing the residue from accumulating in the residue well and clogging the filter of the liquid storage tank. The material loading trough on the conveyor belt can accommodate the residue, and the partitions and arc-shaped openings on the material loading trough can better carry the material residue.

[0006] Preferably, the system further comprises a residue well and a liquid storage tank, wherein the residue well is connected to the lifter, and the liquid storage tank is connected to the residue well, with a first valve disposed between the liquid storage tank and the residue well. The residue well serves as a collection point for residue discharged from the liquid storage tank. The residue well is connected to the lifter so that the residue falls onto the conveyor belt. The first valves disposed on the liquid storage tank and the residue well can open and close the circuit between the residue well and the liquid storage tank, facilitating operations such as cleaning or sampling the residue well.

[0007] Preferably, the elevator is Z-shaped, with a pressure roller and a transmission wheel provided on the elevator, and the conveyor belt is wound around the pressure roller and the transmission wheel and arranged in a Z-shape. The elevator is arranged in a Z-shape, and the conveyor belt is also arranged in a Z-shape by the pressure roller and the transmission wheel, which facilitates the conveyor belt to transport and lift the residue. Specifically, the elevator can be arranged in an inclined Z-shaped structure.

[0008] Preferably, a residue port is provided at the top of the lifter, and a liquid sealing groove is provided at the top of the liquid storage tank. The height of the residue port is greater than or equal to the height of the liquid sealing groove. The residue port on the lifter is used to discharge residue. The liquid sealing groove at the top of the liquid storage tank is connected to the reactor and can pass the solid-liquid mixture in the reactor into the liquid storage tank. The height of the residue port cannot be less than the height of the liquid sealing groove to prevent the liquid in the liquid storage tank and the lifter from being discharged from the residue port together, resulting in loss of filtrate.

[0009] Preferably, at least one of the transmission wheels is connected to a driving device, which can be a motor, and the motor drives the transmission wheel to rotate, thereby driving the conveyor belt to move and separate the residue in time.

[0010] Preferably, a degassing circuit is provided between the residue well and the liquid storage tank, which can balance the air pressure between the residue well and the liquid storage tank, ensuring that the solid-liquid mixture in the liquid storage tank can normally enter the residue well.

[0011] Preferably, the conveyor belt is further provided with a water drop screen hole, which can return the liquid attached to the residue or the liquid in the loading trough to the lifter, thereby reducing the loss of the separated liquid at the residue outlet.

[0012] Preferably, the residue well is sealedly connected to the lifter. Since there is separation fluid in both the residue well and the lifter, the connection between the residue well and the lifter needs to be sealed to prevent the separation fluid from being lost.

[0013] Preferably, a sampling pipeline is provided on the residue well, which can collect samples in the residue well for sample inspection.

[0014] Preferably, the residue well is further provided with a cover, which is detachably connected to the residue well. The cover is detachably connected to the residue well, and when the interior of the residue well needs to be cleaned, the cover is opened, and when separation operations need to be performed, the cover is closed.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) it can separate the solid residue in the residue well during polyester production in a timely manner to prevent the residue from clogging the filter; (2) it has a reflux design and sealing treatment, which can reduce the loss of separation liquid in the residue well and the lifter, thereby improving production efficiency; (3) it is easy to maintain and clean, has a simple structure, lowers production costs, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the conveyor belt of the present utility model.

[0018] In the figure: 1. Elevator, 2. Conveyor belt, 3. Loading trough, 4. Partition, 5. Arc mouth, 6. Residue well, 7. Liquid storage tank, 8. First valve, 9. Press roller, 10. Drive wheel, 11. Residue mouth, 12. Liquid seal tank, 13. Drive device, 14. Degassing circuit, 15. Water screen hole, 16. Sampling pipeline, 17. Sealing cover, 18. Second valve, 19. Transparent tube. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be further described below with reference to specific embodiments and in conjunction with the accompanying drawings.

[0020] Example 1: Figure 1 and Figure 2 The shown device is an automatic residue separation device, comprising a liquid storage tank 7, a residue well 6 and a lifter 1. The liquid storage tank 7 is a collection tank for solid-liquid mixtures. During the polyester production process, the solid-liquid materials in the reactor will be transported to the liquid storage tank 7 for solid-liquid separation. The residue well 6 is connected to the liquid storage tank 7 through a pipeline. The solid-liquid residue in the liquid storage tank 7 enters the residue well 6 through the pipeline for solid-liquid separation. The separated liquid will be collected through a dedicated pipeline (not shown in the figure), while the residue will remain in the residue well 6. The lifter 1 and the residue well 6 are arranged together. Specifically, one side of the residue well 6 is adapted to the size of the lifter 1 and connected together, so that the residue well 6 and the lifter 1 become a whole. The solid-liquid mixture in the residue well 6 is connected to the lifter 1, so that the solid-liquid mixture will also be distributed in the lifter 1. In order to prevent leakage at the connection position between the lifter 1 and the residue well 6, a sealing treatment is required between the lifter 1 and the residue well 6 to achieve a sealed connection.

[0021] In this solution, the elevator 1 is arranged in a Z-shape. The elevator 1 is arranged vertically, with the bottom of the elevator 1 set horizontally and connected to the residue well 6. The top of the elevator 1 is also set horizontally, and the bottom and top of the elevator 1 are staggered to form a Z-shape. A conveyor belt 2 is arranged inside the elevator 1. Specifically, two transmission wheels 10 are set at the bottom of the elevator 1, and two transmission wheels 10 are also set at the top of the elevator 1. The conveyor belt 2 is wound around the four transmission wheels 10. In order for the conveyor belt 2 to operate normally, the position of the conveyor belt 2 needs to be fixed. Specifically, two pressure rollers 9 are set at the bottom of the elevator 1 and near the middle section of the elevator 1. The pressure rollers 9 are set above the conveyor belt 2 and exert downward pressure on the conveyor belt 2, so that the conveyor belt 2 can be horizontal at the bottom of the elevator 1; two pressure rollers 9 are set at the top of the elevator 1 and near the middle section of the elevator 1. The pressure rollers 9 are set below the conveyor belt 2 and exert upward pressure on the conveyor belt 2, so that the conveyor belt 2 can be horizontal at the top of the elevator 1. Therefore, the shape of the conveyor belt 2 is adapted to the shape of the lifter 1 and also becomes a Z shape.

[0022] It should be noted that the end of the conveyor belt 2 is arranged inside the residue well 6 and is located at the bottom of the position where the residue well 6 is connected to the liquid storage tank 7. Therefore, when the residue well 6 of the solid-liquid mixture is input into the liquid storage tank 6, the residue will fall directly on the upper surface of the conveyor belt 2 and be transported away from the residue well 6 through the upper surface, thereby avoiding the accumulation of residue in the residue well 6 and clogging the filter used for polyester production.

[0023] Specifically, a loading trough 3 is provided on the upper surface of the conveyor belt 2, that is, on the surface of the conveyor belt 2 away from the transmission wheel 10. The loading trough 3 is arranged on the entire conveyor belt 2. Figure 2As shown, the loading trough 3 is recessed into the surface of the conveyor belt 2. A number of arcuate openings 5 are provided on both sides of the loading trough 3. The arcuate openings 5 are continuously distributed in a wave-like pattern. A partition 4 is provided in the middle of the loading trough 3 and arranged transversely within the loading trough 3, that is, the partition 4 is arranged along the conveying direction of the conveyor belt 2. When in the residue well 6, the solid-liquid mixture input from the liquid storage tank 7 will fall onto the upper surface of the conveyor belt 2. In other words, the residue will be distributed in the loading trough 3 on the conveyor belt 2. Under the action of the arcuate openings 5 and the partition 4, the residue will adhere to the conveyor belt 2, and the arcuate openings 5 and the partition 4 will serve to transport the residue. As the conveyor belt 2 is transported, the residue enters the bottom position of the lifter 1 from the residue well 6, and then gradually climbs to the top position of the lifter 1. A residue opening 11 is provided at the top position of the lifter 1. The residue opening 11 is provided at the outer end position of the conveyor belt 2. When the residue is about to leave the conveyor belt 2, the residue will fall into the residue opening 11 for slag collection and treatment. After the residue leaves, the conveyor belt 2 continues to return to the residue well 6, thereby realizing a continuous slag removal operation and ensuring that no residue accumulates in the residue well 6.

[0024] A liquid seal groove 12 is provided at the top of the liquid storage tank 7. During the polyester production process, the solid-liquid mixture in the reactor enters the liquid storage tank 7 from the liquid seal groove 12. The height of the liquid seal groove 12 is lower than the position of the residue port 11 at the top of the lifter 1. A first valve 8 is provided in the pipeline connecting the liquid storage tank 7 and the residue well 6. The first valve 8 can open and close the pipeline. When the first valve 8 is in the open state, the solid-liquid mixture in the liquid storage tank 7 will be input into the residue well 6, and the liquid storage tank 7 and the lifter 1 will also become a communicating vessel. If the residue port 11 at the top of the lifter 1 is lower than the height of the liquid seal groove 12, the top of the lifter 1 will also be filled with the solid-liquid mixture, and the liquid will be discharged from the residue port 11, reducing the collection of the filtrate. When the first valve 8 is closed, the liquid storage tank 7 and the residue well 6 are disconnected, and the solid-liquid mixture no longer enters the residue well 6. At this time, the inside of the residue well 6 can be cleaned.

[0025] A water drop screen hole 15 is also provided on the conveyor belt 2. The water drop screen hole 15 is arranged at the bottom of the loading trough 3 and passes through the surface of the conveyor belt 2. When the conveyor belt 2 transports the residue to the top of the elevator 1, the conveyor belt 2 and the residue are separated from the solid-liquid mixing area. At this time, the liquid attached to the residue and the conveyor belt 2 will penetrate into the bottom of the conveyor belt 2 from the water drop screen hole 15 and flow back to the inside of the elevator 1 to prevent the separated liquid from being discharged along with the residue.

[0026] A degassing circuit 14 is also provided between the residue well 6 and the liquid storage tank 7 . The degassing circuit 14 can balance the air pressure between the residue well 6 and the liquid storage tank 7 , ensuring that the solid-liquid mixture in the liquid storage tank 7 can enter the residue well 6 normally.

[0027] It should be noted that the shape of the lifter 1 can be a right-angled Z-shape or an inclined Z-shape. In this solution, an inclined Z-shaped lifter 1 is used, so that the conveyor belt 2 is also arranged in an inclined Z-shape. The bottom and top of the lifter 1 are arranged at an obtuse angle to its inclined section, and the bottom and top of the conveyor belt 2 are also arranged at an obtuse angle to the inclined section, which is more conducive to the residue climbing from the bottom of the lifter 1 to the top of the lifter 1, and can improve the transportation efficiency of the residue. A driving device 13 is also provided on the outside of the lifter 1. The driving device 13 adopts a reduction motor. The output end of the reduction motor is connected to the transmission wheel 10. The reduction motor is connected to one of the transmission wheels 10 to drive the conveyor belt 2 to move. Of course, in order to increase the driving force, two reduction motors can be used to connect the two transmission wheels 10 respectively. In this solution, only one driving device 13 is used to connect the transmission wheel 10, and the driving device 13 is arranged at the top of the lifter 1. Since there will also be solid-liquid mixtures at the bottom and middle section of the lifter 1, it is not conducive to the installation and operation of the driving device 13. Therefore, the driving device 13 can be arranged on the transmission wheel 10 at the top of the lifter 1.

[0028] Example 2: Figure 1 and Figure 2 The shown device is an automatic residue separation device, comprising a liquid storage tank 7, a residue well 6 and a lifter 1. The liquid storage tank 7 is a collection tank for solid-liquid mixtures. During the polyester production process, the solid-liquid materials in the reactor will be transported to the liquid storage tank 7 for solid-liquid separation. The residue well 6 is connected to the liquid storage tank 7 through a pipeline. The solid-liquid residue in the liquid storage tank 7 enters the residue well 6 through the pipeline for solid-liquid separation. The separated liquid will be collected through a dedicated pipeline (not shown in the figure), while the residue will remain in the residue well 6. The lifter 1 and the residue well 6 are arranged together. Specifically, one side of the residue well 6 is adapted to the size of the lifter 1 and connected together, so that the residue well 6 and the lifter 1 become a whole. The solid-liquid mixture in the residue well 6 is connected to the lifter 1, so that the solid-liquid mixture will also be distributed in the lifter 1. In order to prevent leakage at the connection position between the lifter 1 and the residue well 6, a sealing treatment is required between the lifter 1 and the residue well 6 to achieve a sealed connection.

[0029] In this solution, the elevator 1 is arranged in a Z-shape. The elevator 1 is arranged vertically, with the bottom of the elevator 1 set horizontally and connected to the residue well 6. The top of the elevator 1 is also set horizontally, and the bottom and top of the elevator 1 are staggered to form a Z-shape. A conveyor belt 2 is arranged inside the elevator 1. Specifically, two transmission wheels 10 are set at the bottom of the elevator 1, and two transmission wheels 10 are also set at the top of the elevator 1. The conveyor belt 2 is wound around the four transmission wheels 10. In order for the conveyor belt 2 to operate normally, the position of the conveyor belt 2 needs to be fixed. Specifically, two pressure rollers 9 are set at the bottom of the elevator 1 and near the middle section of the elevator 1. The pressure rollers 9 are set above the conveyor belt 2 and exert downward pressure on the conveyor belt 2, so that the conveyor belt 2 can be horizontal at the bottom of the elevator 1; two pressure rollers 9 are set at the top of the elevator 1 and near the middle section of the elevator 1. The pressure rollers 9 are set below the conveyor belt 2 and exert upward pressure on the conveyor belt 2, so that the conveyor belt 2 can be horizontal at the top of the elevator 1. Therefore, the shape of the conveyor belt 2 is adapted to the shape of the lifter 1 and also becomes a Z shape.

[0030] It should be noted that the end of the conveyor belt 2 is arranged inside the residue well 6 and is located at the bottom of the position where the residue well 6 is connected to the liquid storage tank 7. Therefore, when the residue well 6 of the solid-liquid mixture is input into the liquid storage tank 6, the residue will fall directly on the upper surface of the conveyor belt 2 and be transported away from the residue well 6 through the upper surface, thereby avoiding the accumulation of residue in the residue well 6 and clogging the filter used for polyester production.

[0031] Specifically, a loading trough 3 is provided on the upper surface of the conveyor belt 2, that is, on the surface of the conveyor belt 2 away from the transmission wheel 10. The loading trough 3 is arranged on the entire conveyor belt 2. Figure 2 As shown, the loading trough 3 is recessed into the surface of the conveyor belt 2. A number of arcuate openings 5 are provided on both sides of the loading trough 3. The arcuate openings 5 are continuously distributed in a wave-like pattern. A partition 4 is provided in the middle of the loading trough 3 and arranged transversely within the loading trough 3, that is, the partition 4 is arranged along the conveying direction of the conveyor belt 2. When in the residue well 6, the solid-liquid mixture input from the liquid storage tank 7 will fall onto the upper surface of the conveyor belt 2. In other words, the residue will be distributed in the loading trough 3 on the conveyor belt 2. Under the action of the arcuate openings 5 and the partition 4, the residue will adhere to the conveyor belt 2, and the arcuate openings 5 and the partition 4 will serve to transport the residue. As the conveyor belt 2 is transported, the residue enters the bottom position of the lifter 1 from the residue well 6, and then gradually climbs to the top position of the lifter 1. A residue opening 11 is provided at the top position of the lifter 1. The residue opening 11 is provided at the outer end position of the conveyor belt 2. When the residue is about to leave the conveyor belt 2, the residue will fall into the residue opening 11 for slag collection and treatment. After the residue leaves, the conveyor belt 2 continues to return to the residue well 6, thereby realizing a continuous slag removal operation and ensuring that no residue accumulates in the residue well 6.

[0032] A liquid seal groove 12 is provided at the top of the liquid storage tank 7. During the polyester production process, the solid-liquid mixture in the reactor enters the liquid storage tank 7 from the liquid seal groove 12. The height of the liquid seal groove 12 is lower than the position of the residue port 11 at the top of the lifter 1. A first valve 8 is provided in the pipeline connecting the liquid storage tank 7 and the residue well 6. The first valve 8 can open and close the pipeline. When the first valve 8 is in the open state, the solid-liquid mixture in the liquid storage tank 7 will be input into the residue well 6, and the liquid storage tank 7 and the lifter 1 will also become a communicating vessel. If the residue port 11 at the top of the lifter 1 is lower than the height of the liquid seal groove 12, the top of the lifter 1 will also be filled with the solid-liquid mixture, and the liquid will be discharged from the residue port 11, reducing the collection of the filtrate. When the first valve 8 is closed, the liquid storage tank 7 and the residue well 6 are disconnected, and the solid-liquid mixture no longer enters the residue well 6. At this time, the inside of the residue well 6 can be cleaned.

[0033] A water drop screen hole 15 is also provided on the conveyor belt 2. The water drop screen hole 15 is arranged at the bottom of the loading trough 3 and passes through the surface of the conveyor belt 2. When the conveyor belt 2 transports the residue to the top of the elevator 1, the conveyor belt 2 and the residue are separated from the solid-liquid mixing area. At this time, the liquid attached to the residue and the conveyor belt 2 will penetrate into the bottom of the conveyor belt 2 from the water drop screen hole 15 and flow back to the inside of the elevator 1 to prevent the separated liquid from being discharged along with the residue.

[0034] A degassing circuit 14 is also provided between the residue well 6 and the liquid storage tank 7 . The degassing circuit 14 can balance the air pressure between the residue well 6 and the liquid storage tank 7 , ensuring that the solid-liquid mixture in the liquid storage tank 7 can enter the residue well 6 normally.

[0035] It should be noted that the shape of the lifter 1 can be a right-angled Z-shape or an inclined Z-shape. In this solution, an inclined Z-shaped lifter 1 is used, so that the conveyor belt 2 is also arranged in an inclined Z-shape. The bottom and top of the lifter 1 are arranged at an obtuse angle to its inclined section, and the bottom and top of the conveyor belt 2 are also arranged at an obtuse angle to the inclined section, which is more conducive to the residue climbing from the bottom of the lifter 1 to the top of the lifter 1, and can improve the transportation efficiency of the residue. A driving device 13 is also provided on the outside of the lifter 1. The driving device 13 adopts a reduction motor. The output end of the reduction motor is connected to the transmission wheel 10. The reduction motor is connected to one of the transmission wheels 10 to drive the conveyor belt 2 to move. Of course, in order to increase the driving force, two reduction motors can be used to connect the two transmission wheels 10 respectively. In this solution, only one driving device 13 is used to connect the transmission wheel 10, and the driving device 13 is arranged at the top of the lifter 1. Since there will also be solid-liquid mixtures at the bottom and middle section of the lifter 1, it is not conducive to the installation and operation of the driving device 13. Therefore, the driving device 13 can be arranged on the transmission wheel 10 at the top of the lifter 1.

[0036] The residue well 6 is also provided with a cover 17, which is detachably connected to the residue well 6. After the polyester production process is completed, the first valve 8 is closed and the cover 17 is removed, allowing the interior of the residue well 6 to be cleaned or maintained. During the polyester production process, the cover 17 is closed. Furthermore, the residue well 6 is provided with a sampling line 16, which is equipped with a second valve 18 and a transparent tube 19. During the polyester production process, the sampling line 16 is closed. Only during the sampling process is the second valve 18 opened, and a sample is removed from the residue well 6 for testing to verify the product quality during the polyester production process. The transparent tube 19 allows for a direct view of the sample inside the residue well 6.

Claims

1. An automatic residue separation device, characterized in that: It includes an elevator and a residue well. A conveyor belt is provided in the elevator. A loading trough is provided on the surface of the conveyor belt. Partitions are spaced apart on the loading trough along the conveying direction of the conveyor belt. A plurality of arc openings are provided on both sides of the loading trough. The lifter is arranged vertically in a Z shape, the bottom of the lifter is arranged horizontally and is connected to the residue well, and a residue port is provided at the top of the lifter and at the outer end of the conveyor belt.

2. The automatic residue separation device according to claim 1, characterized in that: It also includes a liquid storage tank, which is connected to the residue well, and a first valve is provided between the liquid storage tank and the residue well.

3. The automatic residue separation device according to claim 1 or 2, characterized in that: The lifter is provided with a pressure roller and a transmission wheel, and the conveyor belt is wound around the pressure roller and the transmission wheel and is distributed in a Z shape.

4. The automatic residue separation device according to claim 2, characterized in that: A liquid sealing groove is provided on the top of the liquid storage tank, and the height of the residue opening is greater than or equal to the height of the liquid sealing groove.

5. The automatic residue separation device according to claim 3, characterized in that: At least one of the transmission wheels is connected to a driving device.

6. The automatic residue separation device according to claim 2, characterized in that: A degassing circuit is also provided between the residue well and the liquid storage tank.

7. An automatic residue separation device according to any one of claims 1, 2, 4 or 6, characterized in that: The conveyor belt is also provided with water-falling screen holes.

8. The automatic residue separation device according to any one of claims 2, 4 or 6, characterized in that: The residue well is sealed and connected to the lifter.

9. The automatic residue separation device according to any one of claims 2, 4 or 6, characterized in that: A sampling pipeline is provided on the residue well.

10. The automatic residue separation device according to any one of claims 2, 4 or 6, characterized in that: The residue well is also provided with a sealing cover, which is detachably connected to the residue well.

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