Window cover assembly and flywheel casing with same

Abstract

The utility model provides a window cover assembly and a flywheel casing with the same. The window cover assembly is used for being installed on an observation window of a flywheel shell body, and the window cover assembly comprises a frame body, and the frame body is provided with a first through hole corresponding to the observation window; the cover plate is slidably arranged on the frame body, and the cover plate has a shielding state for shielding the first through hole and an observable state for avoiding at least part of the first through hole; and the frame body is connected with the cover plate through the matching assembly. The flywheel observation window effectively solves the problem that in the prior art, when a worker observes OT scribed lines on a flywheel, the worker needs to detach an observation window cover plate, and the labor intensity of the worker is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a window cover assembly and a flywheel housing having the same. Background Art

[0002] At present, it is usually necessary to set an observation window on the flywheel housing of the engine, and the staff observes the OT scale line on the flywheel through the observation window to facilitate the adjustment of the valve clearance.

[0003] In the prior art, in order to prevent foreign matter from entering the observation window, an observation window cover is usually covered on the observation window and tightened with bolts. When the staff needs to check the flywheel OT line, the bolts are removed and the observation window cover is removed. After the inspection is completed, the observation window cover is fixed with bolts.

[0004] However, the above-mentioned disassembly and assembly method of the observation window cover is not only cumbersome and complicated, resulting in a large number of parts, but also requires the use of tools for disassembly and assembly, which increases the time consumption of disassembly and assembly and may cause the phenomenon of lost parts. Utility Model Content

[0005] The main purpose of the utility model is to provide a window cover assembly and a flywheel housing having the same, so as to solve the problem in the prior art that when workers observe the OT line on the flywheel, they need to disassemble the observation window cover plate, which increases the labor intensity of the workers.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a window cover assembly is provided for being installed on the observation window of the flywheel housing body, the window cover assembly comprising: a frame body, the frame body having a first through hole arranged corresponding to the observation window; a cover plate, slidably arranged on the frame body, the cover plate having a blocking state for blocking the first through hole and an observable state for avoiding at least a part of the first through hole; a mating assembly, the frame body is connected to the cover plate through the mating assembly.

[0007] Furthermore, the mating component includes: a first mating portion, which is arranged on the frame and spaced apart from the first through hole; a second mating portion, which is arranged on the cover plate; wherein one of the first mating portion and the second mating portion is a protrusion, and the other of the first mating portion and the second mating portion is a recess, the protrusion extends into the recess and can slide along the extension direction of the recess, so that the cover plate can switch between a shielding state and an observable state; the extension direction of the recess is consistent with the sliding direction of the cover plate.

[0008] Further, there is one recess and one or more protrusions. When there are multiple protrusions, the multiple protrusions are arranged at intervals along the extension direction of the recess; or, there are multiple recesses and multiple protrusions, and the multiple protrusions are arranged in a one-to-one correspondence with the multiple recesses; or, there are multiple groups of protrusions, and the multiple groups of protrusions are arranged in a one-to-one correspondence with the multiple recesses, and the multiple protrusions in each group are arranged at intervals along the extension direction of the recesses corresponding to the group of protrusions.

[0009] Further, the frame includes: a frame body, having a first through hole and a mounting opening, the mounting opening is used to mount the cover, and the first matching portion is arranged on the frame body; a stopper, detachably arranged at the mounting opening, the stopper having a stopping state in which it is installed at the mounting opening to limit the second matching portion and / or the cover, and a disassembly state in which it is removed from the mounting opening.

[0010] Further, there is one installation opening and one stopper; or, there are multiple installation openings and multiple stoppers, and the multiple stoppers are arranged in one-to-one correspondence with the multiple installation openings.

[0011] Furthermore, there are two installation openings, which are respectively located on both sides of the first through hole. There are two stoppers, which include a first stopper and a second stopper. The first stopper is arranged at one installation opening to cover the installation opening, and the second stopper is arranged at another installation opening and has an opening, and the opening is used for the cover plate to pass through.

[0012] Furthermore, the first matching portion is a recess, the recess is a second through hole, and the extension direction of the second through hole is set at an angle with the extension direction of the first through hole; the second matching portion is a protrusion, and the protrusion is at least one of a convex hump, a bump and a bent portion.

[0013] Furthermore, the protrusion includes a first plate body, a second plate body and a third plate body which are bent in sequence, the first plate body and the third plate body are parallel to each other and arranged opposite to each other, and the first plate body is connected to the cover plate.

[0014] Furthermore, an operating portion is provided on the cover plate; and / or the cover plate and the second matching portion are an integrally formed structure; and / or a buffer layer is provided on the surface of the stopper facing the second matching portion and / or the cover plate.

[0015] According to another aspect of the utility model, a flywheel housing is provided, comprising a flywheel housing body and a window cover assembly arranged on the flywheel housing body; wherein the window cover assembly is the above-mentioned window cover assembly.

[0016] Applying the technical solution of the utility model, the window cover assembly includes a frame, a cover plate and a matching assembly, the frame has a first through hole corresponding to the observation window, the cover plate can be slidably arranged on the frame, and the cover plate has a blocking state of blocking the first through hole and an observable state of avoiding at least part of the first through hole. The frame is connected to the cover plate through the matching assembly. In this way, in the initial state, the cover plate blocks the first through hole and is in a blocking state, thereby preventing impurities and foreign objects such as dust from entering the observation window through the first through hole, so as to fully protect the observation window; when the staff needs to observe the OT lines on the flywheel, it is only necessary to operate the cover plate to slide from the blocking state to the observable state of avoiding at least part of the first through hole. At this time, the first through hole is arranged opposite to the observation window, and the staff can observe the OT lines located in the observation window through the first through hole. After the staff completes the observation of the OT lines, operate the cover plate to slide to the blocking state.

[0017] Compared with the prior art that requires the observation window cover to be removed as a whole, the window cover assembly in the present application is installed as a whole on the flywheel housing body. The staff only needs to operate the cover to slide to observe or cover the observation window without removing the cover, which makes it easier and simpler for the staff to operate the cover. This solves the problem in the prior art that the staff needs to remove the observation window cover when observing the OT line on the flywheel, which increases the labor intensity of the staff and reduces the labor intensity of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a flywheel housing according to an embodiment of the utility model is shown;

[0020] Figure 2 A three-dimensional structural schematic diagram of an embodiment of a window cover assembly according to the utility model is shown;

[0021] Figure 3 Shows Figure 2 A front view of the window cover assembly;

[0022] Figure 4 Shows Figure 3 AA sectional view of the window cover assembly;

[0023] Figure 5 Shows Figure 2 A perspective view of the window cover assembly in a shielded state;

[0024] Figure 6 Shows Figure 2A perspective view of the window cover assembly in a position between a shielding state and an observable state;

[0025] Figure 7 Shows Figure 2 A perspective view of the window cover assembly in an observable state.

[0026] The above drawings include the following reference numerals:

[0027] 10. Flywheel housing body; 11. Observation window;

[0028] 20. frame; 21. first through hole; 22. frame body; 23. stopper; 231. first stopper; 232. second stopper;

[0029] 30. Cover plate; 31. Operation unit;

[0030] 40. Matching assembly; 41. First matching portion; 42. Second matching portion; 421. First plate; 422. Second plate; 423. Third plate. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0033] In the present invention, unless otherwise specified, directional words such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0034] In order to solve the problem in the prior art that workers need to remove the observation window cover when observing the OT line on the flywheel, which increases the labor intensity of the workers, the present application provides a window cover assembly and a flywheel housing having the same.

[0035] like Figures 2 to 7As shown, the window cover assembly is used to be installed on the observation window 11 of the flywheel housing body 10, and the window cover assembly includes a frame 20, a cover plate 30 and a matching assembly 40. Among them, the frame 20 has a first through hole 21 corresponding to the observation window 11. The cover plate 30 is slidably arranged on the frame 20, and the cover plate 30 has a shielding state of shielding the first through hole 21 and an observable state of avoiding at least a part of the first through hole 21. The frame 20 is connected to the cover plate 30 through the matching assembly 40.

[0036] By applying the technical solution of this embodiment, in the initial state, the cover plate 30 blocks the first through hole 21 and is in a blocking state, thereby preventing impurities and foreign objects such as dust from entering the observation window 11 through the first through hole 21, so as to fully protect the observation window 11; when the staff needs to observe the OT lines on the flywheel, they only need to operate the cover plate 30 to slide from the blocking state to the observable state of avoiding at least part of the first through hole 21. At this time, the first through hole 21 is arranged opposite to the observation window 11, and the staff can observe the OT lines in the observation window 11 through the first through hole 21. After the staff has completed the observation of the OT lines, they can operate the cover plate 30 to slide to the blocking state.

[0037] Compared with the prior art that requires the observation window cover to be removed as a whole, the window cover assembly in this embodiment is installed as a whole on the flywheel housing body. The staff only needs to operate the cover 30 to slide to observe or cover the observation window 11 without removing the cover 30, thereby making it easier and more convenient for the staff to operate the cover 30. This solves the problem in the prior art that the staff needs to remove the observation window cover when observing the OT line on the flywheel, which increases the labor intensity of the staff and reduces the labor intensity of the staff.

[0038] In this embodiment, the window cover assembly is a push-pull observation window opening and closing structure, and the frame 20 is directly welded to the flywheel housing body 10, thereby reducing the number of parts and components and reducing the installation process.

[0039] like Figures 5 to 7As shown, the mating component 40 includes a first mating portion 41 and a second mating portion 42. The first mating portion 41 is arranged on the frame 20 and is spaced apart from the first through hole 21, and the second mating portion 42 is arranged on the cover plate 30. Among them, one of the first mating portion 41 and the second mating portion 42 is a protrusion, and the other of the first mating portion 41 and the second mating portion 42 is a recess, and the protrusion extends into the recess and can slide along the extension direction of the recess, so that the cover plate 30 can switch between the shielding state and the observable state. The extension direction of the recess is consistent with the sliding direction of the cover plate 30. In this way, the above-mentioned setting makes the structure of the mating component 40 simpler, easier to process and realize, and reduces the processing cost and difficulty of the mating component 40; on the other hand, it makes the structural selection of the mating component 40 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the mating component 40.

[0040] Specifically, when the staff operates the cover plate 30 to slide, the protrusion extends into the recess and slides along the extension direction of the recess, thereby making the sliding of the cover plate 30 easier and more labor-saving, reducing the difficulty of operation for the staff.

[0041] Optionally, there is one recess and one or more protrusions. When there are multiple protrusions, the multiple protrusions are arranged at intervals along the extension direction of the recess; or, there are multiple recesses and multiple protrusions, and the multiple protrusions are arranged one-to-one with the multiple recesses; or, there are multiple groups of protrusions, and the multiple groups of protrusions are arranged one-to-one with the multiple recesses, and the multiple protrusions in each group are arranged at intervals along the extension direction of the recess corresponding to the group of protrusions. In this way, the above arrangement makes the selection of the number of protrusions and protrusions more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the matching component 40. When there are multiple protrusions and recesses, the above arrangement increases the contact area between the cover plate 30 and the frame 20, thereby improving the sliding stability of the cover plate 30 and the connection stability of the two.

[0042] like Figures 5 to 7 As shown, the frame 20 includes a frame body 22 and a stopper 23. The frame body 22 has a first through hole 21 and an installation opening, the installation opening is used to install the cover plate 30, and the first matching portion 41 is arranged on the frame body 22. The stopper 23 is detachably arranged at the installation opening, and the stopper 23 has a stop state in which it is installed at the installation opening to limit and stop the second matching portion 42 and / or the cover plate 30, and a disassembly state in which it is removed from the installation opening. In this way, when the staff operates the cover plate 30 to slide along the frame 20, the stopper 23 can limit and stop the second matching portion 42 and / or the cover plate 30, thereby preventing the cover plate 30 from falling off the frame 20 and affecting the structural stability of the window cover assembly. At the same time, the above-mentioned arrangement makes the structure of the frame 20 simpler, easier to process and realize, and reduces the processing cost and processing difficulty of the frame 20.

[0043] Specifically, when the window cover assembly needs to be disassembled and assembled, the staff can first remove the stopper 23 from the frame body 22. At this time, the cover plate 30 can be removed from the frame body 22 through the installation port or the cover plate 30 can be installed on the frame body 22, thereby reducing the difficulty of disassembling and assembling the window cover assembly.

[0044] In this embodiment, the stopper 23 has a stopping state in which it is installed at the installation opening to limit the second matching portion 42 and a disassembly state in which it is removed from the installation opening. When the stopper 23 is in the stopping state, the cover 30 can be slidably installed on the frame body 22.

[0045] Optionally, there is one mounting opening and one stopper 23; or, there are multiple mounting openings and multiple stoppers 23, and the multiple stoppers 23 are arranged one-to-one with the multiple mounting openings. In this way, the above arrangement makes the number of mounting openings and stoppers 23 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the matching component 40. When there are multiple mounting openings and stoppers 23, the above arrangement makes the disassembly and assembly method and disassembly and assembly direction of the cover plate 30 more flexible and diverse.

[0046] In this embodiment, there are two mounting openings, which are respectively located on both sides of the first through hole 21. There are two stoppers 23, which include a first stopper 231 and a second stopper 232. The first stopper 231 is arranged at one mounting opening to cover the mounting opening, and the second stopper 232 is arranged at the other mounting opening and has an opening for the cover plate 30 to pass through. In this way, the above arrangement reduces the number of parts of the window cover assembly while ensuring that the cover plate 30 can slide and is easy to disassemble and assemble, thereby reducing the processing cost and difficulty of the window cover assembly.

[0047] It should be noted that the number of the mounting ports is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the number of the mounting ports is three, four, five, or more.

[0048] It should be noted that the number of the stoppers 23 is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the number of the stoppers 23 is three, four, five, or more.

[0049] In this embodiment, the frame body 22 is plate-shaped, the two mounting openings are arranged opposite to each other, and the first through hole 21 penetrates the frame body 22 along the thickness direction of the frame body 22 .

[0050] Optionally, the first matching portion 41 is a recessed portion, which is a second through hole, and the extension direction of the second through hole is set at an angle with the extension direction of the first through hole 21; the second matching portion 42 is a protrusion, which is at least one of a convex bump, a convex block, and a bent portion. In this way, the above arrangement makes the structure of the first matching portion 41 and the second matching portion 42 simpler, easier to process and realize, and reduces the processing cost and difficulty of the matching component 40. At the same time, the above arrangement makes the structural selection of the second matching portion 42 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0051] In this embodiment, the second through hole penetrates the frame body 22 along the length direction of the frame body 22 , and the extending directions of the first through hole 21 and the second through hole are perpendicular to each other.

[0052] like Figure 4 As shown, the protrusion includes a first plate body 421, a second plate body 422 and a third plate body 423 that are bent in sequence, the first plate body 421 and the third plate body 423 are parallel to each other and arranged oppositely, and the first plate body 421 is connected to the cover plate 30. In this way, the above arrangement increases the contact area between the protrusion and the recessed portion, thereby improving the sliding stability of the cover plate 30; on the other hand, the structure of the protrusion is simpler, easy to process and realize, and the processing cost and difficulty of the window cover assembly are reduced.

[0053] Specifically, the first plate 421 and the second plate 422 are disposed perpendicularly to each other, and the second plate 422 and the third plate 423 are disposed perpendicularly to each other. At least one of the first plate 421, the second plate 422 and the third plate 423 contacts the hole wall of the second through hole.

[0054] Optionally, the cover plate 30 is provided with an operating portion 31; and / or the cover plate 30 and the second matching portion 42 are an integrally formed structure; and / or a buffer layer is provided on the surface of the stopper 23 facing the second matching portion 42 and / or the cover plate 30. In this way, the staff can slide the cover plate 30 through the operating portion 31, thereby reducing the difficulty of the staff to operate the cover plate 30. At the same time, the above-mentioned settings make the processing of the cover plate 30 and the second matching portion 42 easier and simpler, and reduce the processing difficulty of the two.

[0055] In this embodiment, an operating portion is provided on the cover plate 30, and the cover plate 30 and the second matching portion 42 are an integrally formed structure. Optionally, the operating portion is a convex block or a concave groove.

[0056] In this embodiment, a buffer layer is provided on the surface of the stopper 23 facing the second matching portion 42 and / or the cover plate 30. Thus, when the worker slides until the cover plate 30 contacts the stopper 23, the buffer layer can reduce the impact force between the two, avoid structural damage, and thus extend the service life of the window cover assembly.

[0057] In this embodiment, the stopper 23 is made of metal material.

[0058] like Figure 1 As shown, the present application also provides a flywheel housing, comprising a flywheel housing body 10 and a window cover assembly arranged on the flywheel housing body 10. The window cover assembly is the above-mentioned window cover assembly.

[0059] In this embodiment, the window cover assembly is directly welded to the flywheel housing body 10 and is not an independent component, which reduces the number of parts and reduces the corresponding management costs and installation procedures.

[0060] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0061] The window cover assembly includes a frame, a cover plate and a matching assembly. The frame has a first through hole corresponding to the observation window. The cover plate can be slidably arranged on the frame. The cover plate has a blocking state of blocking the first through hole and an observable state of avoiding at least part of the first through hole. The frame is connected to the cover plate through a matching assembly. In this way, in the initial state, the cover plate blocks the first through hole and is in a blocking state, thereby preventing impurities and foreign objects such as dust from entering the observation window through the first through hole, so as to fully protect the observation window; when the staff needs to observe the OT lines on the flywheel, they only need to operate the cover plate to slide from the blocking state to the observable state of avoiding at least part of the first through hole. At this time, the first through hole is arranged opposite to the observation window, and the staff can observe the OT lines in the observation window through the first through hole. After the staff completes the observation of the OT lines, operate the cover plate to slide to the blocking state.

[0062] Compared with the prior art that requires the observation window cover to be removed as a whole, the window cover assembly in the present application is installed as a whole on the flywheel housing body. The staff only needs to operate the cover to slide to observe or cover the observation window without removing the cover, which makes it easier and simpler for the staff to operate the cover. This solves the problem in the prior art that the staff needs to remove the observation window cover when observing the OT line on the flywheel, which increases the labor intensity of the staff and reduces the labor intensity of the staff.

[0063] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0066] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A window cover assembly, for installation on an observation window (11) of a flywheel housing body (10), characterized in that: The window cover assembly comprises: A frame (20), the frame (20) having a first through hole (21) arranged corresponding to the observation window (11); A cover plate (30) is slidably disposed on the frame body (20), the cover plate (30) having a shielding state for shielding the first through hole (21) and an observable state for avoiding at least a portion of the first through hole (21); A matching component (40), wherein the frame (20) is connected to the cover plate (30) via the matching component (40).

2. The window cover assembly according to claim 1, characterized in that: The mating assembly (40) comprises: A first matching portion (41) is arranged on the frame (20) and is spaced apart from the first through hole (21); A second matching portion (42) is arranged on the cover plate (30); One of the first matching portion (41) and the second matching portion (42) is a protrusion, and the other of the first matching portion (41) and the second matching portion (42) is a recessed portion, wherein the protrusion extends into the recessed portion and can slide along the extension direction of the recessed portion, so that the cover plate (30) can switch between the shielding state and the observable state; the extension direction of the recessed portion is consistent with the sliding direction of the cover plate (30).

3. The window cover assembly according to claim 2, characterized in that: There is one concave portion and one or more protrusions. When there are multiple protrusions, the multiple protrusions are arranged at intervals along the extending direction of the concave portion; or There are multiple recesses and multiple protrusions, and the multiple protrusions are arranged in one-to-one correspondence with the multiple recesses; or, there are multiple groups of protrusions, and the multiple groups of protrusions are arranged in one-to-one correspondence with the multiple recesses, and the multiple protrusions in each group are arranged at intervals along the extension direction of the recesses corresponding to the group of protrusions.

4. The window cover assembly according to claim 2, characterized in that: The frame (20) comprises: A frame body (22) having the first through hole (21) and a mounting opening, the mounting opening being used to mount the cover plate (30), and the first matching portion (41) being arranged on the frame body (22); A stopper (23) is detachably arranged at the installation opening, and the stopper (23) has a stopping state in which it is installed at the installation opening to limit and stop the second matching portion (42) and / or the cover plate (30), and a disassembly state in which it is removed from the installation opening.

5. The window cover assembly according to claim 4, characterized in that: There is one installation opening and one stopper (23); or there are multiple installation openings and multiple stoppers (23), and the multiple stoppers (23) are arranged in a one-to-one correspondence with the multiple installation openings.

6. The window cover assembly according to claim 4, characterized in that: There are two installation openings, and the two installation openings are respectively located on both sides of the first through hole (21); there are two stoppers (23), and the two stoppers (23) include a first stopper (231) and a second stopper (232); the first stopper (231) is arranged at one installation opening to cover the installation opening, and the second stopper (232) is arranged at the other installation opening and has an opening, and the opening is used for the cover plate (30) to pass through.

7. The window cover assembly according to claim 2, characterized in that: The first matching portion (41) is the recessed portion, the recessed portion is a second through hole, and the extension direction of the second through hole is arranged at an angle with the extension direction of the first through hole (21); the second matching portion (42) is the protrusion, and the protrusion is at least one of a convex hump, a convex block and a bent portion.

8. The window cover assembly according to claim 7, characterized in that: The protrusion comprises a first plate body (421), a second plate body (422) and a third plate body (423) which are bent in sequence, the first plate body (421) and the third plate body (423) are parallel to each other and arranged opposite to each other, and the first plate body (421) is connected to the cover plate (30).

9. The window cover assembly according to claim 4, characterized in that: The cover plate (30) is provided with an operating portion (31); and / or, The cover plate (30) and the second matching portion (42) are an integrally formed structure; and / or, A buffer layer is provided on the surface of the stopper (23) facing the second matching portion (42) and / or the cover plate (30).

10. A flywheel housing, characterized in that: It comprises a flywheel housing body (10) and a window cover assembly arranged on the flywheel housing body (10); wherein the window cover assembly is the window cover assembly according to any one of claims 1 to 9.

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