Chemical additive dosing device and dosing method for sewage treatment tank

Abstract

The present invention discloses a chemical additive dosing device for a sewage treatment tank and its dosing method. The device includes components such as a track, a movable base, rollers, a plurality of additive tanks circumferentially distributed, a cloth box, a double-shaft motor, etc. arranged on the top of the sewage treatment tank. A piston mechanism is provided inside the additive tank, and precise dosing of the additive is achieved by driving with the double-shaft motor. A partition plate and a liquid receiving pipe section are provided inside the cloth box for preliminary mixing of different additives. The rotating pipe fittings and the stirring mechanism ensure sufficient mixing of the additives and the sewage. The present invention realizes precise dosing and efficient mixing of the additives through automatic control, improves the sewage treatment efficiency, and reduces the need for manual intervention. In addition, through modular design and intelligent control system, the device has the characteristics of strong flexibility, strong adaptability, energy conservation and environmental protection, and is suitable for sewage treatment requirements of different scales and types.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically, to a chemical additive dosing device and dosing method for a sewage treatment tank. Background Art

[0002] With the acceleration of industrialization and urbanization, sewage treatment has become an important task in environmental protection. Sewage treatment not only involves removing pollutants such as suspended solids, organic matter, and inorganic salts in sewage, but also often requires adding specific chemical additives to improve the treatment effect or meet specific water quality standards. For example, in some cases, a flocculant needs to be added to promote the coagulation and precipitation of solid particles, or a disinfectant needs to be added to kill bacteria and viruses in the water.

[0003] Currently, the chemical additive dosing methods used in sewage treatment mainly include manual dosing and simple automated dosing.

[0004] Among them, although the manual dosing method has high flexibility, it has the following disadvantages:

[0005] High labor intensity: Manual dosing of additives requires staff to frequently carry and operate, resulting in a relatively high labor intensity.

[0006] Poor accuracy: Due to the instability of manual operation, it is difficult to ensure that the dosage of each additive added is completely accurate every time.

[0007] Low safety: Prolonged contact with chemical additives may pose a hazard to human health.

[0008] While existing automated dosing equipment can reduce the manual labor intensity, there are still deficiencies in the mixing efficiency and dosing accuracy of additives. For example, some equipment can only achieve the dosing of a single type of additive and cannot handle the mixing problem of multiple additives simultaneously; while some other equipment can achieve the mixing of multiple additives, but due to insufficient mixing, the treatment effect is not good. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an adaptive chemical additive dosing system that can achieve the automatic dosing of multiple chemical additives and ensure the full mixing of additives with sewage, thereby improving the sewage treatment efficiency and water quality.

[0010] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A chemical additive dosing device for a sewage treatment tank, including a track provided at the top of the sewage treatment tank and a movable base provided in the track. A plurality of additive tanks distributed circumferentially are provided on the top of the movable base. A cloth box is fixed to the bottom of the movable base through a fixed connecting rod. Additive output pipes are provided at the bottoms of the plurality of additive tanks, and the additive output pipes are connected into the cloth box;

[0011] A plurality of chambers are formed in the cloth box through partitions. The plurality of additive output pipes are respectively connected to different chambers. A columnar area is formed in the middle of the cloth box by the partition. A liquid receiving pipe section is provided in the columnar area. A plurality of through holes evenly distributed vertically are provided on the side walls of the columnar area and the partition. A strip hole is provided on the side wall of the liquid receiving pipe section;

[0012] A double-shaft motor is provided on the top of the movable base. The second output shaft at the bottom of the double-shaft motor passes downward through the movable base and is connected with a rotating pipe fitting through a coupling. The liquid receiving pipe section is arranged in the middle of the rotating pipe fitting, and an additive output hole is provided at the lower end of the rotating pipe fitting.

[0013] In a preferred solution, rollers are provided at the bottom of the movable base, and the rollers drive the movable base to move on the track.

[0014] In a preferred solution, an additive input pipe is connected to the side wall of the additive tank. An movable block is provided in the additive tank. A piston is embedded on the bottom surface of the movable block. A piston rod is connected to the top surface of the piston, and the piston rod passes through the top surface of the movable block and the top surface of the additive tank.

[0015] In a preferred solution, a first output shaft is provided on the top of the double-shaft motor. The first output shaft extends upward above the top surface of the additive tank, and a rotating block is provided at the upper end of the first output shaft. A downward variable-height annular protrusion is provided on the bottom surface of the rotating block, and the downward variable-height annular protrusion contacts the upper ends of the piston rods protruding from the top surfaces of the plurality of additive tanks.

[0016] In a preferred solution, a first spring is sleeved on the piston rod in the additive tank, and a second spring is sleeved on the piston rod outside the additive tank.

[0017] In a preferred solution, a vertical groove is provided on the inner side wall of the additive tank. One end of the additive input pipe is connected in the vertical groove. A protrusion is provided on the outer wall of the movable block, and the protrusion is located in the vertical groove.

[0018] In a preferred solution, a driving gear is provided on the rotating pipe fitting below the cloth box. A plurality of stirring shafts are movably provided on the bottom surface of the cloth box. Driven gears meshing with the driving gear are provided on the upper parts of the stirring shafts, and stirring rods are provided at the lower ends of the stirring shafts.

[0019] Based on the above additive feeding method of the chemical additive feeding device for a sewage treatment tank, the specific steps are as follows:

[0020] 1) The device drives the rollers through the drive system, causing the device to move above the operation area on the track;

[0021] 2) Start the conveying valves on the pipelines connected to the multiple additive input pipes;

[0022] 3) Start the double-shaft motor. The first output shaft drives the rotating block to rotate, and under the action of the first spring and the second spring, the movable blocks and pistons in the multiple additive tanks are successively lowered and raised;

[0023] 4) Different additives enter the additive tanks in sequence and are injected into different compartments in the cloth tank after being pressurized by the pistons. The additives in different compartments are preliminarily mixed through the through holes on the partition plates;

[0024] 5) The second output shaft at the lower end of the double-shaft motor simultaneously drives the liquid receiving pipe joint to rotate. The strip holes on the liquid receiving pipe joint are successively aligned with different through holes on the central cylindrical area of the partition plate, realizing the injection of different additives into the rotating pipe fitting;

[0025] 6) The different additives injected into the rotating pipe fitting are output from the additive output holes at the lower end of the rotating pipe fitting, and are fully mixed with the sewage in the sewage treatment tank under the action of the stirring rods on both sides of the output position.

[0026] In the preferred solution, in step 3), the first spring remains in a compressed state and ensures the fit between the movable block and the piston;

[0027] The second spring ensures that the movable block and the piston can perform an upward reset action during the rotation of the rotating block;

[0028] The elastic modulus of the first spring is greater than that of the second spring.

[0029] In the preferred solution, in step 6), the continuous rotation of the rotating pipe fitting drives the change of the orientation of the additive output holes, enabling the additives to be evenly diffused in all directions.

[0030] The chemical additive feeding device and feeding method for a sewage treatment tank provided by the present invention, by adopting the above structure and method, have the following beneficial effects:

[0031] (1) By using a double-shaft motor to drive the piston mechanism and the rotating pipe fitting inside the additive tank, automatic intermittent conveying and feeding of additives are realized. The movement of the rollers on the track enables the entire device to be automatically positioned above the sewage treatment tank, reducing the need for manual intervention;

[0032] (2) The initial mixing of the additive in the cloth box is achieved through the through holes on the partition plate and the strip holes on the liquid receiving pipe joint. The continuous rotation of the rotating pipe fitting and the stirring action of the stirring rod ensure the sufficient mixing of the additive and the sewage, improving the efficiency of the chemical reaction;

[0033] (3) The design of multiple additive tanks allows for the simultaneous treatment of multiple chemical additives, meeting different sewage treatment requirements. It is also possible to adjust the types and dosing sequences of the additives according to different treatment processes, enhancing the application scope of the device. Description of the Drawings

[0034] The present invention will be further described below in conjunction with the drawings and embodiments:

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0036] Figure 2 It is a schematic diagram of the structure above the movable base of the present invention.

[0037] Figure 3 It is a schematic diagram of the structure below the movable base of the present invention.

[0038] Figure 4 It is a schematic diagram of a partial structure of the stirring system of the present invention.

[0039] Figure 5 It is a schematic top view of the cloth box of the present invention.

[0040] Figure 6 It is a schematic diagram of the rotating block of the present invention.

[0041] In the figure: sewage treatment tank 1, track 2, movable base 3, roller 4, additive tank 5, movable stop block 6, vertical groove 7, additive input pipe 8, convex part 9, piston 10, piston rod 11, first spring 12, second spring 13, additive output pipe 14, double-shaft motor 15, first output shaft 151, second output shaft 152, rotating block 16, variable-height annular convexity 161, cloth box 17, fixed connecting rod 171, rotating pipe fitting 18, partition plate 19, through hole 191, liquid receiving pipe joint 20, strip hole 21, driving gear 22, stirring shaft 23, driven gear 24, additive output hole 25, stirring rod 26. Detailed Embodiments

[0042] Embodiment 1:

[0043] This embodiment provides a chemical additive dosing device for a sewage treatment tank, and the device includes but is not limited to the following components:

[0044] Sewage treatment tank 1: provides a working environment for the entire device.

[0045] Track 2: Set on the top of the sewage treatment tank, used to support and guide the movement of the movable base.

[0046] Movable base 3: Set inside Track 2 and can move freely on the track.

[0047] Roller 4: Set at the bottom of the movable base 3, used to drive the movable base to move along the track.

[0048] Additive tanks 5: Multiple, arranged circumferentially on the top of the movable base 3 to ensure a reasonable spatial layout of the additive output pipe 14, used to store different types of chemical additives.

[0049] Additive input pipe 8: Connected to the additive tank 5, used to transport the externally stored additives into the additive tank.

[0050] Additive output pipe 14: Connected to the bottom of the additive tank 5, used to transport the additives from the additive tank to the cloth box.

[0051] Cloth box 17: Fixed to the bottom of the movable base 3 through the fixed connecting rod 171, used to receive and mix the additives from the additive tank 5.

[0052] Partition 19: Forms multiple chambers inside the cloth box 17, used to preliminarily mix different types of additives.

[0053] Liquid receiving pipe joint 20: Set in the cylindrical area of the cloth box 17, used to receive the mixed additives and guide the additives to the rotating pipe fitting 18 through the strip holes 21.

[0054] Rotating pipe fitting 18: Set below the cloth box 17, used to finally transport the additives into the sewage treatment tank.

[0055] Dual-axis motor 15: Set on the top of the movable base 3, used to drive the rotation of the movable block 6 and the piston mechanism inside the additive tank 5 and the rotating pipe fitting 18.

[0056] Rotating block 16: Set on the first output shaft 151 of the dual-axis motor 15, used to drive the lifting of the piston mechanism.

[0057] Stirring shaft 23: Set below the cloth box 17, used to further mix the additives with the sewage.

[0058] The specific structure of the device part is as follows:

[0059] The device includes a track 2 arranged at the top of a sewage treatment tank 1 and a movable base 3 arranged in the track 2. A plurality of additive tanks 5 distributed circumferentially are arranged on the top of the movable base 3. A cloth box 17 is fixed to the bottom of the movable base 3 through a fixed connecting rod 171. Additive output pipes 14 are arranged at the bottoms of the plurality of additive tanks 5, and the additive output pipes 14 are connected into the cloth box 17;

[0060] A plurality of chambers are formed in the cloth box 17 through a partition plate 19. The plurality of additive output pipes 14 are respectively connected to different chambers. The partition plate 19 forms a cylindrical area in the middle of the cloth box 17. A liquid receiving pipe joint 20 is arranged in the cylindrical area. A plurality of through holes 191 are uniformly distributed vertically on the side walls of the cylindrical area and the partition plate 19. A strip hole 21 is arranged on the side wall of the liquid receiving pipe joint 20;

[0061] A double-shaft motor 15 is arranged on the top of the movable base 3. A second output shaft 152 at the bottom of the double-shaft motor 15 passes through the movable base 3 downward and is connected with a rotating pipe fitting 18 through a coupling. The liquid receiving pipe joint 20 is arranged in the middle of the rotating pipe fitting 18. An additive output hole 25 is arranged at the lower end of the rotating pipe fitting 18.

[0062] In a preferred solution, rollers 4 are arranged at the bottom of the movable base 3, and the rollers 4 drive the movable base 3 to move on the track 2.

[0063] In a preferred solution, an additive input pipe 8 is connected to the side wall of the additive tank 5. A movable block 6 is arranged in the additive tank 5. A piston 10 is embedded on the bottom surface of the movable block 6. A piston rod 11 is connected to the top surface of the piston 10, and the piston rod 11 passes through the top surface of the movable block 6 and the top surface of the additive tank 5.

[0064] In a preferred solution, a first output shaft 151 is arranged at the top of the double-shaft motor 15. The first output shaft 151 extends upward above the top surface of the additive tank 5, and a rotating block 16 is arranged at the upper end of the first output shaft 151. A downward variable-height annular protrusion 161 is arranged on the bottom surface of the rotating block 16, and the downward variable-height annular protrusion 161 contacts the upper ends of the piston rods 11 protruding from the top surfaces of the plurality of additive tanks 5.

[0065] In a preferred solution, a first spring 12 is sleeved on the piston rod 11 in the additive tank 5, and a second spring 13 is sleeved on the piston rod 11 outside the additive tank 5.

[0066] In a preferred solution, a vertical groove 7 is arranged on the inner side wall of the additive tank 5. One end of the additive input pipe 8 is connected to the vertical groove 7. A protrusion 9 is arranged on the outer wall of the movable block 6, and the protrusion 9 is located in the vertical groove 7.

[0067] In a preferred embodiment, a driving gear 22 is provided on the rotating pipe fitting 18 below the fabric box 17. A plurality of stirring shafts 23 are movably provided on the bottom surface of the fabric box 17. A driven gear 24 meshing with the driving gear 22 is provided on the upper part of the stirring shaft 23, and a stirring rod 26 is provided at the lower end of the stirring shaft 23.

[0068] Embodiment 2:

[0069] Based on the additive feeding method of the chemical additive feeding device for a sewage treatment tank described in Embodiment 1, the method specifically includes the following steps:

[0070] 1) The device drives the rollers 4 through the driving system to move the device above the operation area on the track 2;

[0071] 2) Start the conveying valves on the pipelines connected to the plurality of additive input pipes 8;

[0072] 3) Start the double-shaft motor 15. The first output shaft 151 drives the rotating block 16 to rotate, and under the action of the first spring 12 and the second spring 13, the movable stoppers 6 and the pistons 10 in the plurality of additive tanks 5 are sequentially lowered and raised;

[0073] 4) Different additives sequentially enter the additive tanks 5 and are injected into different compartments in the fabric box 17 after being pressurized by the pistons 10. The additives in different compartments are preliminarily mixed through the through holes 191 on the partition plate 19;

[0074] 5) The second output shaft 152 at the lower end of the double-shaft motor 15 simultaneously drives the liquid receiving pipe joint 20 to rotate. The strip holes 21 on the liquid receiving pipe joint 20 are sequentially aligned with different through holes 191 in the central cylindrical area of the partition plate 19, so as to realize the injection of different additives into the rotating pipe fitting 18;

[0075] 6) The different additives injected into the rotating pipe fitting 18 are output from the additive output holes 25 at the lower end of the rotating pipe fitting 18, and are fully mixed with the sewage in the sewage treatment tank 1 under the action of the stirring rods 26 on both sides of the output position.

[0076] In a preferred embodiment, in step 3), the first spring 12 is kept in a compressed state to ensure the fit between the movable stopper 6 and the piston 10;

[0077] The second spring 13 ensures that the movable stopper 6 and the piston 10 can perform an upward reset action during the rotation of the rotating block 16;

[0078] The elastic modulus of the first spring 12 is greater than the elastic modulus of the second spring 13.

[0079] In a preferred embodiment, in step 6), the continuous rotation of the rotating pipe fitting 18 drives the change of the orientation of the additive output holes 25, so that the additives can be evenly diffused around.

[0080] Example 3:

[0081] Based on the above Example 1, the following components and functions can be further added:

[0082] Sensor integration: Temperature sensors, pressure sensors, etc. are integrated on the movable base 3 to monitor the working conditions in the additive tank 5, ensuring that the additives are dispensed under suitable conditions.

[0083] Remote control system: Through the wireless communication module, the working status of the entire device can be remotely monitored and controlled, enabling remote adjustment of the dispensing parameters.

[0084] Emergency stop button: An emergency stop button is provided on the movable base 3 to handle emergencies.

[0085] When adopting the above solution, through sensor integration and the remote control system, the working status of the device can be monitored in real time, and the dispensing parameters can be adjusted as needed.

[0086] The setting of the emergency stop button improves the safety of the device, allowing it to stop working quickly in case of anomalies and avoiding accidents.

[0087] The integration of sensors makes fault diagnosis more convenient and reduces maintenance costs.

[0088] Example 4:

[0089] Based on the above Example 1, a modular chemical additive dispensing device for sewage treatment tanks can be further provided. The device is characterized in that the number and type of additive tanks can be flexibly configured according to actual needs.

[0090] Among them:

[0091] The movable base 3 is designed as a modular structure, and the number of additive tanks 5 can be increased or decreased as needed.

[0092] In addition to the standard additive tank 5, additive tanks with special functions can be added, such as additive tanks with heating or cooling functions, to meet the requirements of specific additives.

[0093] The modular design enables the device to adapt to different scales and types of sewage treatment requirements.

[0094] By adding additive tanks with special functions, the requirements of special additives can be better met, improving the treatment effect.

[0095] Selecting and configuring additive tanks according to actual needs avoids unnecessary investment and reduces operating costs.

[0096] Example 5:

[0097] Based on the above-mentioned Embodiment 1, a chemical additive dosing device for a sewage treatment tank that focuses on energy conservation can be further provided, which reduces energy consumption through optimized design and the use of energy-saving materials.

[0098] Among them:

[0099] An energy-efficient double-shaft motor 15 is adopted to reduce power consumption.

[0100] The movable base 3 and other components are made of lightweight materials to reduce the overall weight and the energy required for driving.

[0101] Through an optimized control algorithm, the optimal timing and optimal amount of additive dosing are achieved, reducing unnecessary energy consumption.

[0102] Based on Embodiments 1-2, the chemical additive dosing device and dosing method for a sewage treatment tank disclosed by the present invention have the following effects:

[0103] High degree of automation: The double-shaft motor is used to drive the piston mechanism and the rotating pipe fittings inside the additive tank, realizing the automatic transportation and dosing of additives; the movement of the rollers on the track enables the entire device to automatically position above the sewage treatment tank, greatly reducing the need for manual intervention.

[0104] Accurate dosing: The design of the piston mechanism combined with the first spring and the second spring realizes the alternating quantitative dosing of different additives, improving the accuracy of additive dosing; each additive tank works independently and can accurately control the dosing amount of each additive according to a predetermined program, avoiding the problems of over-dosing or under-dosing.

[0105] Adequate mixing: The preliminary mixing of additives in the cloth box is realized through the through holes on the partition plate and the slotted holes on the liquid receiving pipe joint; the continuous rotation of the rotating pipe fittings and the stirring action of the stirring rod ensure the adequate mixing of additives and sewage, improving the efficiency of chemical reactions.

[0106] Simple operation: The entire device has a compact structure, facilitating installation and maintenance; the automatic dosing process simplifies the operation process and reduces the operation difficulty.

Claims

1. A chemical additive dosing device for a sewage treatment tank, comprising a track (2) arranged on the top of the sewage treatment tank (1) and a movable base (3) arranged in the track (2), characterized in that: A plurality of additive boxes (5) distributed in an annular direction are provided on the top of the movable base (3); a material distribution box (17) is fixed to the bottom of the movable base (3) via a fixed connecting rod (171); additive output pipes (14) are provided at the bottom of the plurality of additive boxes (5); and the additive output pipes (14) are connected to the inside of the material distribution box (17); The material distribution box (17) has a plurality of chambers formed by a partition (19), and a plurality of additive output pipes (14) are respectively connected to different chambers. The partition (19) forms a columnar region in the middle of the material distribution box (17), and a liquid receiving pipe section (20) is provided in the columnar region. A plurality of vertically evenly distributed through holes (191) are provided on the side wall of the columnar region and the partition (19), and a strip hole (21) is provided on the side wall of the liquid receiving pipe section (20); A double-shaft motor (15) is provided at the top of the movable base (3); a second output shaft (152) at the bottom of the double-shaft motor (15) passes downward through the movable base (3) and is connected to a rotating pipe member (18) via a coupling; a liquid receiving pipe section (20) is provided in the middle of the rotating pipe member (18); and an additive output hole (25) is provided at the lower end of the rotating pipe member (18); The additive box (5) has an additive inlet pipe (8) connected to the side wall thereof. A movable stopper (6) is provided in the additive box (5). A piston (10) is embedded on the bottom surface of the movable stopper (6). The top surface of the piston (10) is connected to a piston rod (11). The piston rod (11) passes through the top surface of the movable stopper (6) and the top surface of the additive box (5). A first output shaft (151) is provided on the top of the dual-axis motor (15), the first output shaft (151) extends upward to above the top surface of the additive box (5), and a rotating block (16) is provided on the upper end of the first output shaft (151), and a downwardly-protruding annular protrusion (161) is provided on the bottom surface of the rotating block (16), and the height-changing annular protrusion (161) contacts the upper ends of piston rods (11) extending from the top surfaces of the plurality of additive boxes (5).

2. The chemical additive dosing device for a sewage treatment pool according to claim 1, characterized in that: A roller (4) is provided at the bottom of the movable base (3), and the roller (4) drives the movable base (3) to move on the track (2).

3. The chemical additive dosing device for a sewage treatment pool according to claim 2, characterized in that: A first spring (12) is sleeved on the piston rod (11) inside the additive box (5), and a second spring (13) is sleeved on the piston rod (11) outside the additive box (5).

4. The chemical additive dosing device for a sewage treatment pool according to claim 1, characterized in that: The inner wall of the additive box (5) is provided with a vertical groove (7), one end of the additive inlet pipe (8) is connected to the vertical groove (7), and the outer wall of the movable stopper (6) is provided with a protrusion (9), which is located in the vertical groove (7).

5. The chemical additive dosing device for a sewage treatment pool according to claim 3, characterized in that: A driving gear (22) is provided on the rotating pipe member (18) below the material distribution box (17), a plurality of stirring shafts (23) are movably provided on the bottom surface of the material distribution box (17), a driven gear (24) meshing with the driving gear (22) is provided on the upper part of the stirring shaft (23), and a stirring rod (26) is provided at the lower end of the stirring shaft (23).

6. The method for adding additives to a chemical additive adding device for a sewage treatment tank according to claim 5, characterized in that The following steps are involved: 1) The device drives the roller (4) through the drive system, so that the device moves on the track (2) to above the working area; 2) starting the delivery valves on the pipelines connected to the multiple additive inlet pipes (8); 3) starting the dual-axis motor (15), the first output shaft (151) drives the rotating block (16) to rotate and, under the action of the first spring (12) and the second spring (13), the movable blocks (6) and the pistons (10) in the plurality of additive boxes (5) are sequentially lowered and raised; 4) Different additives are sequentially introduced into the additive box (5) and injected into different compartments in the material distribution box (17) after being pressurized by the piston (10), and the additives in different compartments are preliminarily mixed through the through holes (191) on the partition (19); 5) The second output shaft (152) at the lower end of the dual-axis motor (15) drives the liquid receiving pipe section (20) to rotate simultaneously, and the strip holes (21) on the liquid receiving pipe section (20) are aligned with different through holes (191) on the central columnar region of the partition (19) in sequence, so as to realize the injection of different additives into the rotating pipe member (18); 6) The various additives injected into the rotating pipe member (18) are discharged from the additive output hole (25) at the lower end of the rotating pipe member (18) and are fully mixed with the sewage in the sewage treatment tank (1) under the action of the stirring rods (26) on both sides of the output position.

7. The method for adding additives to a chemical additive adding device for a sewage treatment pool according to claim 6, characterized in that: In the step 3), the first spring (12) remains in a compressed state and ensures the fit between the movable stopper (6) and the piston (10); The second spring (13) ensures that the movable stopper (6) and the piston (10) can perform an upward reset action during the rotation of the rotating block (16); The elastic modulus of the first spring (12) is greater than the elastic modulus of the second spring (13).

8. The method for adding additives to a chemical additive adding device for a sewage treatment pool according to claim 6, characterized in that: In the step 6), the continuous rotation of the rotating tube (18) drives the direction of the additive output hole (25) to change, so that the additive can be evenly diffused in all directions.

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