Quantitative discharge assembly of silt and dredging device

Abstract

The application provides a silt quantitative discharging assembly and a dredging device. The silt quantitative discharging assembly comprises a collecting box, a sliding seat, a carrying table and a monitoring assembly. The upper and lower sides of the collecting box are respectively provided with an inlet and a discharge outlet. The sliding seat is slidingly arranged on the inner wall of the collecting box and is drivingly connected with a lifting driving member. The carrying table is arranged in the collecting box and is hingedly connected with the inner side of the sliding seat. The carrying table is provided with a strip-shaped hole, a connecting rod is inserted into the strip-shaped hole, and the two ends of the connecting rod are connected with the collecting box. The monitoring assembly is arranged in the collecting box and is used for detecting the height of silt in a measuring chamber surrounded by the surface of the carrying table when the surface of the carrying table is in a first inclined state. When the value range of the quantitative discharge is detected, the surface of the carrying table is switched to a second inclined state, so that the silt falls out. The silt quantitative discharging assembly and the dredging device provided by the application can monitor the recovery amount of silt and discharge the silt when the preset amount is reached, so that the technical purpose of quantitative discharge of silt is achieved.

Description

Technical Field

[0001] This application belongs to the field of sludge treatment technology, specifically relating to a sludge quantitative discharge component and a sludge dredging device. Background Technology

[0002] Silt deposition significantly raises the riverbed and reduces the cross-sectional area of ​​the river channel. Especially during the flood season, silt deposition can cause abnormally high water levels, greatly increasing the risk of levee overflow and breach. Therefore, regular silt treatment is essential to ensure stable water levels.

[0003] In existing technologies, sludge treatment processes include recycling, impurity removal, and purification. Between the recycling and impurity removal steps, operators control the sludge discharge rate by controlling the duration of outlet opening. However, this method gradually loses its accuracy as the amount of sludge accumulates. Therefore, there is an urgent need in existing technologies for a discharge component that can monitor the amount of sludge recycled in real time and discharge it when the amount of sludge recycled reaches a certain range. Utility Model Content

[0004] This application provides a sludge quantitative discharge component and a sludge removal device, which are designed to monitor the amount of sludge recovered and discharge it when a preset amount is reached.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A sludge metering discharge component is provided, comprising: The material collection box has a feed inlet and a discharge outlet on its upper and lower sides, respectively. The sliding seat is slidably connected to the inner wall of the collection box and is connected to a lifting drive component. A loading platform is disposed within the collection box and hinged to the inner side of the sliding seat; the loading platform has a strip-shaped hole extending along the hinge axis, and a connecting rod is coaxially inserted into the strip-shaped hole, with both ends of the connecting rod connected to the inner wall of the collection box; and The monitoring component is installed inside the collection bin; The lifting drive component can drive the sliding seat to move downward so that the surface of the material platform is in a first inclined state, and the surface of the material platform, the upper side of the sliding seat and the inner wall of the collection box form a measuring chamber. The measuring chamber is used to receive sludge discharged through the feed inlet, and the monitoring component is used to monitor the sludge height in the measuring chamber. The lifting drive component can also drive the sliding seat to move upward, so that the surface of the material platform is in a second inclined state, and the sludge on the surface of the material platform can fall downward through the gap between the material platform and the inner wall of the collection box.

[0006] In one possible implementation, the top of the collection box is provided with a first reserved hole, and the lifting drive component includes: The drive base is slidably disposed on the outside of the collection box in the vertical direction, and a transmission nut is fixedly disposed on it; A first rotating motor is fixedly installed on the outside of the collection box, and its power output end is coaxially connected to a transmission screw, which is threadedly connected to the transmission nut; and A traction rope, one end of which is connected to the sliding seat, and the other end extending through the first reserved hole and connected to the drive seat; and When the first rotating motor is started, it can drive the drive seat to move downward, so as to apply an upward pulling force to the sliding seat through the traction rope, so that the surface of the material platform switches to the second tilt state. Alternatively, the drive seat can be moved upward to release part of the traction rope, and the sliding seat falls under its own gravity, causing the surface of the loading platform to switch to the first tilt state.

[0007] In one possible implementation, the material collection box has a protective cover on its outside; the protective cover is fitted over the drive seat and the first rotating motor and is integrally connected to the material collection box.

[0008] In one possible implementation, the drive seat has a guide hole that extends through in the vertical direction; a guide rod extending in the vertical direction is fixedly disposed inside the protective cover, and the guide rod is inserted into the guide hole.

[0009] In one possible implementation, the drive seat has a snap-fit ​​hole that extends vertically; the transmission nut is coaxially embedded in the snap-fit ​​hole, and both ends of the snap-fit ​​hole have a cover that is detachably connected to the drive seat.

[0010] In one possible implementation, the collection box has a connecting shaft extending in the vertical direction; the sliding seat has a through hole extending in the vertical direction, and the connecting shaft is inserted into the through hole to form a degree of freedom for the sliding seat to move relative to the collection box in the vertical direction.

[0011] In one possible implementation, a spring is fitted onto the connecting shaft; the spring is located below the sliding seat, and its two ends are respectively connected to the lower ends of the sliding seat and the connecting shaft; When the surface of the loading platform is in the second inclined state, the spring is in an elastic tension state and applies a downward pulling force to the sliding seat; When the surface of the loading platform is in the first inclined state, the spring is in an elastic tension state or a non-deformation state.

[0012] In one possible implementation, the monitoring component is a diffuse reflection photoelectric sensor; the diffuse reflection photoelectric sensor is fixedly connected to the inner top wall of the collection box, and its monitoring end is arranged facing downwards.

[0013] In one possible implementation, the collection box also includes a rotating roller located below the loading platform, with its axis perpendicular to the axis of the connecting rod. The rotating roller has a degree of freedom to rotate relative to the collection box about its own central axis, and is connected to a second rotating motor; and the rotating roller has an agitator arm extending radially outward. When the second rotating motor drives the rotating roller to rotate, the stirring arm can contact the sludge on the lower side of the loading platform and apply a force around the rotating roller to the sludge.

[0014] In this embodiment, by providing a feed inlet, the recovered sludge can be collected and discharged into the collection box. Furthermore, by using a lifting drive component to move the sliding seat vertically, the loading platform can swing relative to the collection box and move relative to the connecting rod, thereby switching the surface of the loading platform to a first inclined state. In this state, the surface of the loading platform, the upper side of the sliding seat, and the inner wall of the collection box together form a measuring chamber, which is located directly below the feed inlet to achieve the recovery of the introduced material.

[0015] Because the surface of the loading platform is in a first inclined state, the cross-sectional area of ​​the measuring chamber gradually increases from bottom to top. Based on this structure, the monitoring component achieves better accuracy during detection. This is because, firstly, sludge accumulates along the inclined surface of the loading platform, avoiding detection errors; secondly, the chamber structure with its gradually increasing cross-sectional area amplifies the height of even a small amount of sludge. That is, the same amount of sludge has a greater height within this structure, resulting in a wider data range from which the monitoring component can provide data, making it easier to compare with standard discharge levels.

[0016] When the sludge in the measurement room reaches the standard discharge amount (or enters the allowable discharge range), the lifting drive component can drive the sliding seat to move upward, so that the surface of the platform switches from the first tilt state to the second tilt state; in this state, the sludge will slide down along the tilted surface, thereby moving away from the side where the sliding seat is located, and finally fall out from the gap between the platform and the inner wall of the collection box into the discharge port.

[0017] The sludge quantitative discharge component provided in this embodiment, compared with the prior art, can monitor the amount of sludge recovered and discharge it when it reaches a preset amount, so as to achieve the technical purpose of real-time monitoring and timely discharge of sludge and avoid the adverse effects caused by sludge accumulation.

[0018] The technical solution adopted in this application also provides a dredging device, including the sludge quantitative discharge component proposed in any of the preceding claims.

[0019] The beneficial effects of the dredging device provided in this embodiment are the same as those of the aforementioned sludge quantitative discharge component, and will not be repeated here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 One of the front views of the sludge metering discharge assembly provided in the embodiments of this application; Figure 2 A second front view of the sludge metering discharge assembly provided in the embodiments of this application; Figure 3 A third front view of the sludge metering discharge assembly provided in the embodiments of this application; Figure 4 A three-dimensional structural schematic diagram of the sludge quantitative discharge component provided in the embodiments of this application; Figure 5 This is a three-dimensional structural diagram of the collection box used in the embodiments of this application; Figure 6 This is a three-dimensional structural diagram of the sliding seat and the material carrier used in the embodiments of this application in a combined state; Figure 7 This is a three-dimensional structural diagram of the drive seat and transmission nut used in the embodiments of this application from an exploded perspective. Explanation of reference numerals in the attached drawings: 1. Collection box; 11. Feed inlet; 12. Discharge outlet; 13. Connecting rod; 14. First reserved hole; 15. Connecting shaft; 2. Sliding seat; 21. Through hole; 3. Carrying platform; 31. Strip hole; 4. Monitoring component; 5. Lifting drive component; 51. Drive seat; 511. Guide hole; 512. Snap-fit ​​hole; 513. Cover; 52. First rotating motor; 53. Traction rope; 6. Protective cover; 61. Guide rod; 7. Spring; 8. Rotating roller; 81. Second rotating motor; 82. Agitator arm; 10. Transmission nut; 20. Transmission screw. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] Please refer to the following: Figures 1 to 7 The sludge quantitative discharge assembly provided in this application will now be described. The sludge quantitative discharge assembly proposed in this application includes a collection box 1, a sliding seat 2, a loading platform 3, and a monitoring component 4.

[0027] The collection box 1 adopts a hollow cuboid structure. Figures 1 to 3 It is a sectional view made with one side of the inner wall of the collection box 1 as the reference plane, that is, one side of the collection box 1 is hidden so as to make it easier to observe its internal structure. The upper and lower sides of the collection box 1 are respectively provided with a feed inlet 11 and a discharge outlet 12. In actual use, the sludge is discharged from the feed inlet 11 and discharged from the discharge outlet 12.

[0028] The sliding seat 2 is slidably connected to the inner wall of the collection box 1 in the vertical direction, and the sliding seat 2 is also connected to a lifting drive component 5 for controlling its lifting and locking. In this embodiment, for ease of description and to match the perspective of the accompanying drawings, the inner wall to which the sliding seat 2 is slidably connected is defined as the right wall of the collection box 1.

[0029] The loading platform 3 is located inside the collection box 1, specifically inside the sliding seat 2 (i.e., on the side of the sliding seat 2 facing the central axis of the collection box 1, on the left side of the sliding seat 2), and is hinged to the inner side of the sliding seat 2; the hinge axis is parallel to the horizontal plane and perpendicular to the left and right direction, i.e., the front and back direction.

[0030] The loading platform 3 has a strip-shaped hole 31 that runs through it along its hinge axis (i.e., the front-to-back direction). A connecting rod 13 is coaxially inserted into the strip-shaped hole 31, and both ends of the connecting rod 13 are connected to the inner wall of the collection box 1.

[0031] The monitoring component 4 is installed inside the collection box 1. Its function is to monitor the material height on the loading platform 3, so that the on-site operators or the corresponding control system can compare it with the preset standard height to determine the timing of material discharge.

[0032] In actual use, the lifting drive component 5 can drive the sliding seat 2 to move downwards, so that the surface of the loading platform 3 is in a first inclined state (e.g., Figure 2 As shown), the surface of the loading platform 3, the upper side of the sliding seat 2, and the inner wall of the collection box 1 form a measuring chamber. The measuring chamber is used to receive the sludge discharged through the feed inlet 11, and the monitoring component 4 is used to monitor the sludge height in the measuring chamber.

[0033] The lifting drive component 5 can also drive the sliding seat 2 to move upward, so that the surface of the loading platform 3 is in a second inclined state (e.g. Figure 3 As shown), the silt on the surface of the loading platform 3 can fall downward through the gap between the loading platform 3 and the inner wall of the collection box 1.

[0034] In this embodiment, by providing the feed inlet 11, the recovered sludge can be concentrated and discharged into the collection box 1. Furthermore, by using the lifting drive component 5 to move the sliding seat 2 vertically, the loading platform 3 can swing relative to the collection box 1 and move relative to the connecting rod 13, thereby switching the surface of the loading platform 3 to a first inclined state. In this state, the surface of the loading platform 3, the upper side of the sliding seat 2, and the inner wall of the collection box 1 together form a measuring chamber, which is located directly below the feed inlet 11, to achieve the recovery of the introduced material.

[0035] Because the surface of the loading platform 3 is in a first inclined state, the cross-sectional area of ​​the measuring chamber gradually increases from bottom to top. Based on this structure, the monitoring component 4 achieves better accuracy when performing detection. This is because, on the one hand, the sludge will accumulate along the surface of the loading platform 3 in the first inclined state, avoiding detection errors; on the other hand, the chamber structure with a gradually increasing cross-sectional area from bottom to top can amplify the height of a small amount of sludge. That is, for the same amount of sludge, it has a greater height in this structure, and the monitoring component 4 can provide a wider range of data, making it easier to compare with standard discharge levels.

[0036] When the sludge in the measuring chamber reaches the standard discharge amount (or enters the allowable discharge range), the lifting drive component 5 can drive the sliding seat 2 to move upward, so that the surface of the platform switches from the first tilt state to the second tilt state; in this state, the sludge will slide down along the tilted surface, thereby moving away from the side where the sliding seat 2 is located, and finally fall out from the gap between the platform and the inner wall of the collection box 1 into the discharge port 12.

[0037] The sludge quantitative discharge component provided in this embodiment, compared with the prior art, can monitor the amount of sludge recovered and discharge it when it reaches a preset amount, so as to achieve the technical purpose of real-time monitoring and timely discharge of sludge and avoid the adverse effects caused by sludge accumulation.

[0038] In some embodiments, such as Figures 1 to 5 As shown, the top of the collection box 1 is provided with a first reserved hole 14, and the lifting drive component 5 includes a drive seat 51, a first rotating motor 52 and a traction rope 53.

[0039] The drive base 51 is slidably disposed on the outside of the collection box 1 in the vertical direction, and a transmission nut 10 is fixedly disposed on it.

[0040] The first rotating motor 52 is fixedly installed on the outside of the collection box 1, and its power output end is coaxially connected to a transmission screw 20. The transmission screw 20 and the transmission nut 10 are located on the same side and are threadedly connected.

[0041] The traction rope 53 is partially located inside the collection box 1 and partially located outside the collection box 1. Specifically, the traction rope 53 is made of flexible material, with one end connected to the sliding seat 2 and the other end extending through the first reserved hole 14 and connected to the drive seat 51. The traction rope 53 is kept taut as a whole.

[0042] In actual use, when the first rotating motor 52 is started, it can drive the drive seat 51 to move downward, thereby applying an upward pulling force to the sliding seat 2 via the traction rope 53, causing the surface of the loading platform 3 to switch to the second inclined state. Alternatively, the first rotating motor 52 can drive the drive seat 51 to move upward, thereby releasing part of the traction rope 53, and the sliding seat 2 falls under its own weight, causing the surface of the loading platform 3 to switch to the first inclined state.

[0043] In some embodiments, such as Figures 1 to 5 As shown, the outer side of the collection box 1 has a protective cover 6; the protective cover 6 is fitted on the outside of the drive seat 51 and the first rotating motor 52, and is integrally connected with the collection box 1, thereby protecting the relevant structures.

[0044] In some embodiments, such as Figure 5 and Figure 7As shown, the drive seat 51 has a guide hole 511 that runs through the vertical direction; a guide rod 61 extending vertically is fixedly installed inside the protective cover 6, and the guide rod 61 is inserted into the guide hole 511 to form a sliding connection between the drive seat 51 and the protective cover 6.

[0045] In some embodiments, such as Figure 7 As shown, the drive seat 51 has a snap-fit ​​hole 512 that runs through the vertical direction; the transmission nut 10 is coaxially embedded in the snap-fit ​​hole 512, and both ends of the snap-fit ​​hole 512 have a cover 513 that can be detachably connected to the drive seat 51, so as to realize the embedded installation of the transmission nut 10 relative to the drive seat 51, and the stability of the combined structure is ensured by the cover 513 on both sides.

[0046] In some embodiments, such as Figure 3 , Figure 5 and Figure 6 As shown, the collection box 1 has a connecting shaft 15 extending in the vertical direction; the sliding seat 2 has a through hole 21 extending in the vertical direction, and the connecting shaft 15 is inserted into the through hole 21 to form the degree of freedom for the sliding seat 2 to move relative to the collection box 1 in the vertical direction.

[0047] In some embodiments, such as Figures 1 to 3 As shown, a spring 7 is sleeved on the connecting shaft 15; the spring 7 is located below the sliding seat 2, and its two ends are connected to the lower ends of the sliding seat 2 and the connecting shaft 15, respectively.

[0048] When the surface of the loading platform 3 is in the second inclined state, the spring 7 is in an elastic tension state and applies a downward pulling force to the sliding seat 2.

[0049] When the surface of the loading platform 3 is in the first tilted state, the spring 7 is in an elastic tension state or a non-deformed state.

[0050] By adopting the above technical solution, during the process of switching the loading platform 3 to the first tilt state, the spring 7 plays an auxiliary role, that is, it provides a downward pulling force to the sliding seat 2, so as to avoid the situation that the sliding seat 2 cannot move smoothly due to reasons such as silt blocking the hole and thus cannot switch to the first tilt state.

[0051] In some embodiments, the monitoring component 4 is a diffuse reflection photoelectric sensor, that is, the transmitter and receiver are integrated and work by the reflected light of the sludge; the diffuse reflection photoelectric sensor is fixedly connected to the inner top wall of the collection box 1 and its monitoring end is set facing downward.

[0052] Specifically, the transmitter emits a beam of light onto the surface of the loading platform 3. After the sludge accumulates, the beam of light will be diffusely reflected when it encounters the sludge at the top, and part of the scattered light will be reflected back to the receiver of the sensor, thereby triggering a signal and detecting the height of the sludge.

[0053] In some embodiments, such as Figures 1 to 4 As shown, the collection box 1 also has a rotating roller 8, which is located below the loading platform 3 and its axis is perpendicular to the axis of the connecting rod 13.

[0054] The rotating roller 8 has a degree of freedom to rotate relative to the collection box 1 with its own central axis as the axis, and is connected to a second rotating motor 81 for driving its rotation; and the rotating roller 8 has an agitator arm 82 extending radially outward.

[0055] When the second rotating motor 81 drives the rotating roller 8 to rotate, the stirring arm 82 can contact the sludge on the lower side of the loading platform 3 and apply a force around the rotating roller 8 to the sludge to prevent the sludge from clumping and ensure that the sludge is discharged smoothly.

[0056] Based on the same inventive concept, embodiments of this application also provide a dredging device, including the sludge quantitative discharge component proposed in any of the preceding claims.

[0057] The beneficial effects of the dredging device provided in this embodiment are the same as those of the aforementioned sludge quantitative discharge component, and will not be repeated here.

[0058] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sludge metering discharge component, characterized in that, include: The material collection box has a feed inlet and a discharge outlet on its upper and lower sides, respectively. The sliding seat is slidably connected to the inner wall of the collection box and is connected to a lifting drive component. A loading platform is disposed within the collection box and hinged to the inner side of the sliding seat; the loading platform has a strip-shaped hole extending along the hinge axis, and a connecting rod is coaxially inserted into the strip-shaped hole, with both ends of the connecting rod connected to the inner wall of the collection box; and The monitoring components are installed inside the collection bin; The lifting drive component can drive the sliding seat to move downward so that the surface of the material platform is in a first inclined state, and the surface of the material platform, the upper side of the sliding seat and the inner wall of the collection box form a measuring chamber. The measuring chamber is used to receive sludge discharged through the feed inlet, and the monitoring component is used to monitor the sludge height in the measuring chamber. The lifting drive component can also drive the sliding seat to move upward, so that the surface of the material platform is in a second inclined state, and the sludge on the surface of the material platform can fall downward through the gap between the material platform and the inner wall of the collection box.

2. The sludge metering discharge component as described in claim 1, characterized in that, The top of the collection box is provided with a first reserved hole, and the lifting drive component includes: The drive base is slidably disposed on the outside of the collection box in the vertical direction, and a transmission nut is fixedly disposed on it; A first rotating motor is fixedly installed on the outside of the collection box, and its power output end is coaxially connected to a transmission screw, which is threadedly connected to the transmission nut; and A traction rope, one end of which is connected to the sliding seat, and the other end extending through the first reserved hole and connected to the drive seat; and When the first rotating motor is started, it can drive the drive seat to move downward, so as to apply an upward pulling force to the sliding seat through the traction rope, so that the surface of the material platform switches to the second tilt state. Alternatively, the drive seat can be moved upward to release part of the traction rope, and the sliding seat falls under its own gravity, causing the surface of the loading platform to switch to the first tilt state.

3. The sludge metering discharge component as described in claim 2, characterized in that, The material collection box has a protective cover on its outside; the protective cover is fitted over the drive seat and the first rotating motor and is integrally connected to the material collection box.

4. The sludge metering discharge component as described in claim 3, characterized in that, The drive base has a guide hole that runs through the vertical direction; a guide rod extending vertically is fixedly installed inside the protective cover, and the guide rod is inserted into the guide hole.

5. The sludge metering discharge component as described in claim 2, characterized in that, The drive seat has a snap-fit ​​hole that runs through the vertical direction; the transmission nut is coaxially embedded in the snap-fit ​​hole, and both ends of the snap-fit ​​hole have a cover that can be detachably connected to the drive seat.

6. The sludge metering discharge component as described in any one of claims 1-5, characterized in that, The collection box has a connecting shaft extending in the vertical direction; the sliding seat has a through hole extending in the vertical direction, and the connecting shaft is inserted into the through hole to form a degree of freedom for the sliding seat to move relative to the collection box in the vertical direction.

7. The sludge metering discharge component as described in claim 6, characterized in that, A spring is fitted onto the connecting shaft; the spring is located below the sliding seat, and its two ends are respectively connected to the lower ends of the sliding seat and the connecting shaft. When the surface of the loading platform is in the second inclined state, the spring is in an elastic tension state and applies a downward pulling force to the sliding seat; When the surface of the loading platform is in the first inclined state, the spring is in an elastic tension state or a non-deformation state.

8. The sludge metering discharge component as described in claim 1, characterized in that, The monitoring component is a diffuse reflection type photoelectric sensor; the diffuse reflection type photoelectric sensor is fixedly connected to the inner top wall of the collection box, and its monitoring end is set facing downward.

9. The sludge metering discharge component as described in claim 1, characterized in that, The collection box also has a rotating roller, which is located below the material loading platform and its axis is perpendicular to the axis of the connecting rod. The rotating roller has a degree of freedom to rotate relative to the collection box about its own central axis, and is connected to a second rotating motor; and the rotating roller has an agitator arm extending radially outward. When the second rotating motor drives the rotating roller to rotate, the stirring arm can contact the sludge on the lower side of the loading platform and apply a force around the rotating roller to the sludge.

10. A dredging device, characterized in that, Includes the sludge metering discharge component as described in any one of claims 1-9.

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