Comprehensive pipe network drainage system

Abstract

The invention provides a comprehensive pipe network drainage system, and relates to the field of municipal engineering. The device comprises a rainwater pipe, a sewage pipe, a drainage pipe and a water collecting tank body, the rainwater pipe and the sewage pipe are both communicated with the drainage pipe, and strain mechanisms are arranged between the water collecting tank body and the rainwater pipe and between the water collecting tank body and the sewage pipe. The method has the effect of ensuring normal traffic operation.

Description

Technical Field

[0001] The present application relates to the field of municipal engineering, and in particular to an integrated pipe network drainage system. Background Art

[0002] The municipal drainage system is an important part of urban infrastructure, mainly responsible for collecting and discharging urban sewage and rainwater.

[0003] At present, the traditional municipal drainage system collects sewage and rainwater into the drainage pipe at the same time and discharges them; however, in this way, if there is heavy rain and the sewage is still collected and discharged normally, the rainwater will not be discharged quickly, which can easily cause water accumulation on the road to form a "land lake", which can easily cause traffic to be unable to operate. Summary of the invention

[0004] In order to improve the problems existing in the above-mentioned technologies, the present application provides a comprehensive pipe network drainage system.

[0005] This application provides a comprehensive pipe network drainage system, which adopts the following technical solutions: A comprehensive pipe network drainage system comprises: a rainwater pipe, a sewage pipe, a drain pipe and a water collecting tank body, wherein the rainwater pipe and the sewage pipe are both connected to the drain pipe, and a strain mechanism is arranged between the water collecting tank body and the rainwater pipe and the sewage pipe.

[0006] By adopting the above technical solution, if it rains, the emergency mechanism can automatically increase the amount of water discharged from the rainwater pipe into the drainage pipe per unit time, and reduce the amount of water discharged from the sewage pipe into the drainage pipe per unit time, so that the road surface is not prone to form a "land lake" due to excessive water accumulation, so as to ensure the normal operation of traffic.

[0007] Optionally, the strain mechanism includes: a transition component, a change component, a transmission component, a closing component and an adjustment component, the transition component includes: a closed box, a connecting pipe, a filter screen and a partition, one end of the connecting pipe is connected to the water collecting tank body, and the other end is connected to the closed box, the end of the rainwater pipe away from the drain pipe is connected to the closed box, the filter screen is arranged in the connecting pipe, the partition is fixed in the closed box, the change component is arranged between the partition and the closed box, the transmission component is arranged on the change component, the closing component is arranged in the rainwater pipe and the sewage pipe, and the adjustment component is arranged between the closing component and the transmission component.

[0008] By adopting the above technical solution, on rainy days, rainwater can flow into the closed box through the connecting pipe; then, it flows into the drain pipe through the rainwater pipe; if rainwater continues to accumulate in the closed box, the changing component will change according to the actual amount of rainwater.

[0009] Optionally, the changing component includes: a water tank body and a support spring, the water tank body is slidably mounted on the partition, the support spring is fixed between the closing box and the water tank body, and the transmission component is arranged on the water tank body.

[0010] By adopting the above technical solution, if rainwater is not drained in time but continues to accumulate in the closed box, then when the water level exceeds the height of the top of the partition, the rainwater will overflow into the water tank body; as rainwater is continuously injected, the weight of the water tank body increases and decreases, and during this process, the transmission component can operate.

[0011] Optionally, the transmission component includes: a transmission cylinder, a transmission rack and a transmission gear, the transmission cylinder is connected to the closed box, one end of the transmission rack is fixed to the water tank body, and the other end is arranged in the transmission cylinder, the transmission gear is arranged on the adjustment component, and the transmission rack is meshed with the transmission gear.

[0012] By adopting the above technical solution, during the process of the water tank body moving downward, the transmission rack will drive the transmission gear to rotate, so that the adjustment component starts to operate to adjust the opening degree of the closing component.

[0013] Optionally, the adjustment assembly includes: a sleeve, an adjustment rod, an adjustment block and an adjustment sleeve, the sleeve is fixed between the transmission cylinder and the rainwater pipe and between the transmission cylinder and the sewage pipe, the adjustment block is slidably arranged on the closing assembly, one end of the adjustment sleeve is hinged to the adjustment block, and the other end passes through the sleeve, one end of the adjustment rod is rotatably installed in the sleeve and threadedly connected to the adjustment sleeve, and the other end passes through the transmission cylinder and is coaxially fixed with the transmission gear.

[0014] By adopting the above technical solution, when the transmission gear rotates, the adjusting rod rotates together to drive the adjusting sleeve to extend and retract in the sleeve, so that the closing component can be flipped to change the opening degree of the rainwater pipe and the sewage pipe.

[0015] Optionally, the closing assembly includes: a valve plate and a rotating shaft, the valve plate is rotatably installed in the rainwater pipe and the sewage pipe via the rotating shaft, and the regulating block is slidably arranged on the valve plate.

[0016] By adopting the above technical solution, during the downward movement of the water tank body, the adjusting sleeve corresponding to the rainwater pipe will pull the valve plate to flip toward a vertical state to increase the opening degree of the rainwater pipe; the adjusting sleeve corresponding to the sewage pipe will push the valve plate to flip toward an inclined state to reduce the opening degree of the sewage pipe.

[0017] Optionally, a release mechanism is provided between the closed box and the water tank body, and the release mechanism includes: a control component and a water discharge component, the water discharge component is provided between the water tank body and the drain pipe, and the control component is provided between the water discharge component and the closed box.

[0018] By adopting the above technical solution, during the downward movement of the water tank body, the adjusting sleeve corresponding to the rainwater pipe will pull the valve plate to flip toward a vertical state to increase the opening degree of the rainwater pipe; the adjusting sleeve corresponding to the sewage pipe will push the valve plate to flip toward an inclined state to reduce the opening degree of the sewage pipe.

[0019] Optionally, the drain assembly includes: a hose, a drain pipe, a fixed plate, a drain plate and a reset spring, one end of the drain pipe is connected to the drain pipe, and the other end passes through the closed box, one end of the hose is connected to the water tank body, and the other end is connected to the drain pipe, the fixed plate is fixed in the drain pipe, and a water hole is penetrated through the fixed plate, a control hole is opened on the inner wall of the water hole, the drain plate is arranged in the control hole, and the reset spring is fixed between the drain plate and the bottom of the control hole, and the control assembly is arranged between the drain plate and the closed box.

[0020] By adopting the above technical solution, once the water level in the closed box continues to rise, the drain plate will be inserted into the water hole to close the water hole, so that the water tank body can receive overflowing rainwater at any time.

[0021] Optionally, the control component includes: a float, a control rope and a guide wheel, the float is arranged in the closed box, the guide wheel is fixed in the closed box, one end of the control rope is fixed to the float, and the other end is wrapped around the guide wheel and passes through the control hole to be fixedly connected to the drain plate.

[0022] By adopting the above technical solution, after the accumulated water in the closed box is discharged, the float ball drops; during this process, the control rope will pull the drain plate back into the control hole to release the blockage, thereby facilitating the discharge of rainwater in the water tank body.

[0023] Optionally, the control component further includes: a mesh cover, the mesh cover is fixed in the closed box, and the float is arranged in the mesh cover.

[0024] By adopting the above technical solution, the mesh cover is used to limit the floating ball so that the floating ball can only move up and down in the vertical direction.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. If it rains, the emergency mechanism can automatically increase the amount of water discharged from the rainwater pipe into the drainage pipe per unit time, and reduce the amount of water discharged from the sewage pipe into the drainage pipe per unit time, so that the road surface is not prone to form "land lakes" due to excessive water accumulation, so as to ensure the normal operation of traffic.

[0026] 2. During the downward movement of the water tank, the adjusting sleeve corresponding to the rainwater pipe will pull the valve plate to flip toward the vertical state to increase the opening degree of the rainwater pipe; the adjusting sleeve corresponding to the sewage pipe will push the valve plate to flip toward the inclined state to reduce the opening degree of the sewage pipe.

[0027] 3. During the downward movement of the water tank, the adjusting sleeve corresponding to the rainwater pipe will pull the valve plate to flip toward the vertical state to increase the opening degree of the rainwater pipe; the adjusting sleeve corresponding to the sewage pipe will push the valve plate to flip toward the inclined state to reduce the opening degree of the sewage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the structure according to an embodiment of the present application; Figure 2 yes Figure 1 A schematic side view of Figure 3 is along Figure 2 A schematic cross-sectional view taken along the cutting line AA in FIG. Figure 4 yes Figure 3 A schematic partial enlarged view of part B; Figure 5 is along Figure 2 A schematic cross-sectional view taken along the cutting line CC in FIG. Figure 6 yes Figure 5 Schematic partial enlarged view of part D in the figure.

[0029] In the figure: 1. rainwater pipe; 11. sewage pipe; 12. drainage pipe; 13. water collecting tank body; 2. transition component; 21. closing box; 22. connecting pipe; 23. filter screen; 24. partition; 3. changing component; 31. water collecting tank body; 32. supporting spring; 4. transmission component; 41. transmission cylinder; 42. transmission rack; 43. transmission gear; 5. adjustment component; 51. sleeve; 52. adjustment rod; 53. adjustment block; 54. adjustment sleeve; 6. closing component; 61. valve plate; 62. rotating shaft; 7. drain component; 71. hose; 72. drain pipe; 73. fixing plate; 731. water hole; 732. control hole; 74. drain plate; 75. reset spring; 8. control component; 81. float; 82. control rope; 83. guide wheel; 84. mesh cover. DETAILED DESCRIPTION

[0030] The present application provides a comprehensive pipe network drainage system.

[0031] See also Figure 1 A comprehensive pipe network drainage system includes: a rainwater pipe 1, a sewage pipe 11, a drainage pipe 12 and a water collecting trough body 13. The rainwater pipe 1 and the sewage pipe 11 are both connected to the drainage pipe 12, and the rainwater pipe 1 is also connected to the water collecting trough body 13. In actual application, the water collecting trough body 13, the rainwater pipe 1 and the sewage pipe 11 are buried underground, and a manhole cover is provided on the water collecting trough body 13. On rainy days, rainwater on the road surface flows into the water collecting trough body 13, and then flows into the drainage pipe 12 from the rainwater pipe 1 for discharge; the end of the sewage pipe 11 away from the drainage pipe 12 is connected to a residential area or a sewage treatment plant.

[0032] See also Figure 2 Furthermore, a strain mechanism is provided between the water collecting trough body 13 and the rainwater pipe 1 and the sewage pipe 11. If there is no rainy weather, the strain mechanism will not operate at all, that is, the water flow rate of the rainwater pipe 1 per unit time is less than the water flow rate of the sewage pipe 11, so that it is not easy to affect the discharge of a large amount of sewage; if there is rainy weather, the strain mechanism can automatically increase the water flow rate of the rainwater pipe 1 into the drainage pipe 12 per unit time, and reduce the water flow rate of the sewage pipe 11 into the drainage pipe 12 per unit time, so that the road surface is not easy to form a "land lake" due to excessive water accumulation, so as to ensure the normal operation of traffic.

[0033] See also Figure 3 and Figure 4 The strain mechanism includes: a transition component 2, a change component 3, a transmission component 4, a closing component 6 and an adjustment component 5.

[0034] See also Figure 3 The transition assembly 2 includes: a closed box 21, a connecting pipe 22, a filter 23 and a partition 24. One end of the connecting pipe 22 is connected to the water collecting tank body 13, and the other end is connected to the closed box 21; the rainwater pipe 1 is connected to the closed box 21. The filter 23 is fixed in one end of the connecting pipe 22 close to the water collecting tank body 13. On rainy days, the filter 23 can filter rainwater to reduce impurities entering the closed box 21, so that it is not easy to cause smooth drainage due to blockage.

[0035] See also Figure 3 , the partition 24 is fixed in the closed box 21, and a space is left between the top of the partition 24 and the inner top wall of the closed box 21 for rainwater overflow; in addition, the connecting pipe 22 and the connecting ends of the rainwater pipe 1 and the closed box 21 are all located on the same side of the partition 24. On rainy days, rainwater can flow into the closed box 21 through the connecting pipe 22; then, it flows into the drain pipe 12 through the rainwater pipe 1; if rainwater continues to accumulate in the closed box 21, the changing component 3 will change according to the actual amount of rainwater.

[0036] See also Figure 3The changing component 3 includes: a water tank body 31 and a support spring 32. The water tank body 31 is slidably mounted on the partition 24. The water tank body 31 slides in the vertical direction and is located on the side of the partition 24 away from the connecting pipe 22. The support spring 32 is fixed between the bottom wall of the water tank body 31 and the inner bottom wall of the closed box 21. The support spring 32 is used to support the water tank body 31. In the embodiment of the present application, multiple support springs 32 can be provided to stably support the water tank body 31. If the rainwater is not drained in time but continuously accumulates in the closed box 21, then when the water level exceeds the height of the top of the partition 24, the rainwater will overflow into the water tank body 31; as the rainwater is continuously injected, the weight of the water tank body 31 increases and decreases. During this process, the transmission component 4 can operate.

[0037] See also Figure 3 and Figure 4 The transmission assembly 4 includes: a transmission cylinder 41, a transmission rack 42 and a transmission gear 43. The transmission cylinder 41 is connected to the closed box 21. The end of the transmission cylinder 41 away from the closed box 21 is closed, and the transmission cylinder 41 is located on the side of the partition 24 close to the water tank body 31. One end of the transmission rack 42 is fixed to the bottom wall of the water tank body 31, and the other end extends into the transmission cylinder 41; the transmission gear 43 is arranged on the adjustment assembly 5, and the transmission rack 42 is meshed with the transmission gear 43. When the water tank body 31 moves downward, the transmission rack 42 drives the transmission gear 43 to rotate, so that the adjustment assembly 5 starts to operate to adjust the opening degree of the closing assembly 6.

[0038] See also Figure 4 In the embodiment of the present application, two transmission gears 43, adjustment components 5 and closing components 6 are provided, and they correspond one to one, one of the closing components 6 is provided in the rainwater pipe 1, and the other is provided in the sewage pipe 11. The adjustment component 5 includes: a sleeve 51, an adjustment rod 52, an adjustment block 53 and an adjustment sleeve 54. The sleeve 51 is fixed between the rainwater pipe 1 and the transmission cylinder 41 and the sewage pipe 11 and the transmission cylinder 41. The actual length of the two sleeves 51 is set according to the distance between the rainwater pipe 1 and the transmission cylinder 41 and the sewage pipe 11 and the transmission cylinder 41. The adjustment block 53 is slidably mounted on the closing component 6.

[0039] See also Figure 4 One end of the adjusting sleeve 54 is hinged to the adjusting block 53, and the other end is arranged in the sleeve 51; one end of the adjusting rod 52 is rotatably installed in the sleeve 51 and threadedly connected to the adjusting sleeve 54, and the other end extends into the transmission cylinder 41 and is coaxially fixed with the transmission gear 43. When the transmission gear 43 rotates, the adjusting rod 52 rotates together to drive the adjusting sleeve 54 to retract and retract in the sleeve 51, so that the closing component 6 can be flipped to change the opening degree of the rainwater pipe 1 and the sewage pipe 11.

[0040] See also Figure 4The closing assembly 6 includes: a valve plate 61 and a rotating shaft 62. The valve plate 61 is rotatably installed in the rainwater pipe 1 and the sewage pipe 11 through the rotating shaft 62; the adjusting block 53 is slidably installed on the valve plate 61. When it does not rain or the rainwater does not overflow into the water tank body 31, the valve plate 61 in the rainwater pipe 1 is in an inclined state, that is, only a small space is opened to allow rainwater to flow through; the valve plate 61 in the sewage pipe 11 is in a vertical state, that is, the maximum space is opened to the sewage pipe 11 to allow sewage to flow through; in the process of the water tank body 31 moving downward, the adjusting sleeve 54 corresponding to the rainwater pipe 1 will pull the valve plate 61 to flip toward the vertical state to increase the opening degree of the rainwater pipe 1; the adjusting sleeve 54 corresponding to the sewage pipe 11 will push the valve plate 61 to flip toward the inclined state to reduce the opening degree of the sewage pipe 11.

[0041] See also Figure 5 and Figure 6 A release mechanism is provided between the closing box 21 and the water tank body 31. When there is no more water accumulation in the closing box 21, the release assembly can discharge the rainwater in the water tank body 31, so as not to easily affect the subsequent adjustment; and after the discharge, the water tank body 31 is reset, that is, the valve plate 61 will also be reset.

[0042] See also Figure 5 and Figure 6 The release mechanism includes: a control component 8 and a water release component 7.

[0043] See also Figure 5 and Figure 6 The drain assembly 7 includes: a hose 71, a drain pipe 72, a fixing plate 73, a drain plate 74 and a reset spring 75. One end of the drain pipe 72 is connected to the closed box 21, and the other end is connected to the drain pipe 12, and the drain pipe 72 is located on the side of the partition 24 close to the water tank body 31; one end of the hose 71 is connected to the water tank body 31, and the other end is connected to the drain pipe 72, and the length of the hose 71 in the embodiment of the present application is long enough to allow the water tank body 31 to move.

[0044] See also Figure 5 and Figure 6 The fixing plate 73 is fixed in the drain pipe 72, and a water hole 731 is formed through the top wall of the fixing plate 73; a control hole 732 is formed in the inner wall of the water hole 731, and the drain plate 74 is arranged in the control hole 732. A reset spring 75 is fixed between the drain plate 74 and the bottom of the control hole 732, and the reset spring 75 is used to reset the drain plate 74. Once the water level in the closed box 21 continues to rise, the drain plate 74 will be inserted into the water hole 731 to close the water hole 731, so that the water tank body 31 can receive the overflowing rainwater at any time.

[0045] See also Figure 5 and Figure 6The control assembly 8 includes: a float 81, a control rope 82 and a guide wheel 83. The float 81 is arranged in the closed box 21 and is located on the side of the partition 24 away from the water tank body 31. The guide wheel 83 is horizontally fixed in the closed box 21 and is located above the partition 24; one end of the control rope 82 is fixedly connected to the float 81, and the other end passes through the control hole 732 and is fixedly connected to one end of the drain plate 74 near the reset spring 75. When the water level in the closed box 21 continues to rise, the float 81 floats upward; during this process, the control rope 82 no longer pulls the drain plate 74, so that the reset spring 75 can push the drain plate 74 to insert into the water hole 731; See also Figure 5 and Figure 6 After the accumulated water in the closed box 21 is discharged, the float 81 drops; during this process, the control rope 82 will pull the drain plate 74 back into the control hole 732 to release the blockage, thereby facilitating the discharge of rainwater in the water tank body 31.

[0046] See also Figure 5 and Figure 6 Furthermore, the control component 8 also includes: a mesh cover 84, the mesh cover 84 is fixed in the closed box 21, the mesh cover 84 is located on the side of the partition 24 away from the water tank body 31, and the float 81 is arranged in the mesh cover 84, and the mesh cover 84 is used to limit the float 81 so that the float 81 can only move up and down in the vertical direction.

[0047] The working principle of a comprehensive pipe network drainage system of the present application when in use is as follows: when it is not raining or the rainwater has not overflowed into the water tank body 31, the valve plate 61 in the rainwater pipe 1 is in an inclined state, that is, only a small space is opened to allow rainwater to flow through; the valve plate 61 in the sewage pipe 11 is in a vertical state, that is, the maximum space is opened to the sewage pipe 11 to allow sewage to flow through; in the process of the water tank body 31 moving downward, the adjustment sleeve 54 corresponding to the rainwater pipe 1 will pull the valve plate 61 to flip toward the vertical state to increase the opening degree of the rainwater pipe 1; the adjustment sleeve 54 corresponding to the sewage pipe 11 will push the valve plate 61 to flip toward the inclined state to reduce the opening degree of the sewage pipe 11.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A comprehensive pipe network drainage system, characterized in that: include: A rainwater pipe (1), a sewage pipe (11), a drainage pipe (12) and a water collecting tank body (13); the rainwater pipe (1) and the sewage pipe (11) are both connected to the drainage pipe (12); and a strain mechanism is provided between the water collecting tank body (13) and the rainwater pipe (1) and the sewage pipe (11).

2. The integrated pipe network drainage system according to claim 1, characterized in that: The strain mechanism comprises: a transition component (2), a change component (3), a transmission component (4), a closing component (6) and an adjustment component (5); the transition component (2) comprises: a closed box (21), a connecting pipe (22), a filter screen (23) and a partition (24); one end of the connecting pipe (22) is connected to the water collecting tank body (13), and the other end is connected to the closed box (21); one end of the rainwater pipe (1) away from the drainage pipe (12) is connected to the closed box (21); The filter screen (23) is arranged in the connecting pipe (22), the partition (24) is fixed in the closed box (21), the changing component (3) is arranged between the partition (24) and the closed box (21), the transmission component (4) is arranged on the changing component (3), the closing component (6) is arranged in the rainwater pipe (1) and the sewage pipe (11), and the regulating component (5) is arranged between the closing component (6) and the transmission component (4).

3. The integrated pipe network drainage system according to claim 2, characterized in that: The changing component (3) comprises: a water tank body (31) and a supporting spring (32); the water tank body (31) is slidably mounted on the partition (24); the supporting spring (32) is fixed between the closed box (21) and the water tank body (31); and the transmission component (4) is arranged on the water tank body (31).

4. The integrated pipe network drainage system according to claim 3, characterized in that: The transmission assembly (4) comprises: a transmission cylinder (41), a transmission rack (42) and a transmission gear (43); the transmission cylinder (41) is connected to the closed box (21); one end of the transmission rack (42) is fixed to the water tank body (31) and the other end is arranged in the transmission cylinder (41); the transmission gear (43) is arranged on the adjustment assembly (5), and the transmission rack (42) is meshed with the transmission gear (43).

5. The integrated pipe network drainage system according to claim 4, characterized in that: The adjustment component (5) comprises: a sleeve (51), an adjustment rod (52), an adjustment block (53) and an adjustment sleeve (54); the sleeve (51) is fixed between the transmission cylinder (41) and the rainwater pipe (1) and between the transmission cylinder (41) and the sewage pipe (11); the adjustment block (53) is slidably arranged on the closing component (6); one end of the adjustment sleeve (54) is hinged to the adjustment block (53) and the other end passes through the sleeve (51); one end of the adjustment rod (52) is rotatably installed in the sleeve (51) and is threadedly connected to the adjustment sleeve (54); the other end passes through the transmission cylinder (41) and is coaxially fixed with the transmission gear (43).

6. The integrated pipe network drainage system according to claim 5, characterized in that: The closing assembly (6) comprises: a valve plate (61) and a rotating shaft (62); the valve plate (61) is rotatably installed in the rainwater pipe (1) and the sewage pipe (11) via the rotating shaft (62); and the regulating block (53) is slidably arranged on the valve plate (61).

7. The integrated pipe network drainage system according to claim 3, characterized in that: A release mechanism is provided between the closed box (21) and the water tank body (31), the release mechanism comprising: a control component (8) and a water discharge component (7), the water discharge component (7) being provided between the water tank body (31) and the drain pipe (12), and the control component (8) being provided between the water discharge component (7) and the closed box (21).

8. The integrated pipe network drainage system according to claim 7, characterized in that: The drain assembly (7) comprises: a hose (71), a drain pipe (72), a fixing plate (73), a drain plate (74) and a return spring (75); one end of the drain pipe (72) is connected to the drain pipe (12), and the other end thereof passes through the closed box (21); one end of the hose (71) is connected to the water tank body (31), and the other end thereof is connected to the drain pipe (72); the fixing plate (73) is fixed to the drain pipe ( The fixing plate (73) is provided with a water hole (731) extending therethrough, the inner wall of the water hole (731) is provided with a control hole (732), the water discharge plate (74) is arranged in the control hole (732), the return spring (75) is fixed between the water discharge plate (74) and the bottom of the control hole (732), and the control assembly (8) is arranged between the water discharge plate (74) and the closed box (21).

9. The integrated pipe network drainage system according to claim 8, characterized in that: The control assembly (8) comprises: a float (81), a control rope (82) and a guide wheel (83); the float (81) is arranged in the closed box (21); the guide wheel (83) is fixed in the closed box (21); one end of the control rope (82) is fixed to the float (81); the other end is wound around the guide wheel (83) and passes through the control hole (732) to be fixedly connected to the water discharge plate (74).

10. The integrated pipe network drainage system according to claim 9, characterized in that: The control component (8) further comprises a mesh cover (84), wherein the mesh cover (84) is fixed in the closed box (21), and the floating ball (81) is arranged in the mesh cover (84).

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