River flood control and drainage structure that can clean up river garbage

Abstract

The present invention relates to the technical field of flood control and drainage structures, and discloses a river flood control and drainage structure capable of cleaning river garbage, comprising a fabric base, a flood drainage channel being arranged in the base, the inner end of the flood drainage channel forming a water inlet, and the outer end of the flood drainage channel forming a water outlet; the flood drainage channel comprises a front section, a middle section and a rear section; the switch channel is arranged between the front section and the middle section, a rolling shaft is arranged in the switch channel, and a connecting channel is arranged in the rolling shaft; a power structure drives the rolling shaft to roll; the bottom of the longitudinal channel extends to between the middle section and the rear section to form an interception section, and the top of the longitudinal channel passes through the top of the base; a horizontally arranged interception net cylinder is arranged in the interception section, the interception net cylinder has a accommodating cavity, and a plurality of mesh holes are arranged on the outer periphery of the interception net cylinder; a feed port is arranged on the interception net cylinder, and a limiting structure is provided on the feed port to limit the river garbage in the accommodating cavity from being discharged outward through the feed port, and the river garbage in the water body is accommodated in the accommodating cavity through the feed port.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of flood control and drainage structures, specifically, to a river flood control and drainage structure that can clean up garbage in the river. Background Art

[0002] When extreme weather events such as heavy rains and floods occur, they pose a huge challenge to the river flood control and drainage system. In terms of flood control and drainage technology, traditional methods include embankment construction and gate control. Embankments are the main engineering measures to prevent river flooding. Their height and slope need to be designed according to the conditions of the river to ensure that they can effectively block the flow of water when floods come. Gates are laid at the drainage outlets. Gates are water retaining structures that can control the flow of river water.

[0003] In the existing technology, garbage in the river is salvaged manually to keep the river unblocked, but the efficiency is low and the labor intensity is high. Alternatively, an interception net is set in the river to intercept the garbage floating on the water surface, but it can only intercept the garbage floating on the water surface and the deployment is difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a river flood control and drainage structure that can clean up river garbage, aiming to solve the problem in the prior art that a large amount of garbage accumulates in the river, causing serious impact on the river's flood discharge capacity.

[0005] The present invention is implemented as follows: a river flood control and drainage structure capable of cleaning river garbage comprises a base arranged at a drainage position of the river, the base having a water-facing surface facing the river, and a water-receiving surface facing away from the river; a flood discharge channel is arranged in the base, the inner end of the flood discharge channel penetrates the water-facing surface to form a water inlet, and the outer end of the flood discharge channel penetrates the water-receiving surface to form a water outlet; along the direction from the water-facing surface to the water-receiving surface, the flood discharge channel comprises a front section, a middle section and a rear section in sequence;

[0006] The base has a switch channel arranged transversely, the switch channel is arranged between the front section and the middle section, a rolling shaft arranged in a rolling manner is provided in the switch channel, the rolling shaft is connected to a power structure driving the rolling shaft to rotate horizontally, and a connecting channel is provided in the rolling shaft; the power structure drives the rolling shaft to roll, when the connecting channel is connected to the front section and the middle section respectively, the flood discharge channel is in an open state, and when the connecting channel is misaligned with the front section and the middle section respectively, the flood discharge channel is in a closed state;

[0007] The base is provided with a longitudinal channel arranged longitudinally, the bottom of the longitudinal channel extends to between the middle section and the rear section to form a transversely arranged interception section, and the top of the longitudinal channel passes through the top of the base; the interception section is provided with a horizontally arranged interception net cylinder, the interception net cylinder has a accommodating cavity, and the outer periphery of the interception net cylinder is provided with a plurality of mesh holes; the interception net cylinder is provided with a feed port, the feed port is arranged along the axial extension of the interception net cylinder, and the feed port is provided with a limiting structure that limits the river garbage in the accommodating cavity from being discharged outward through the feed port;

[0008] When the flood discharge channel is in an open state, the water in the river flows through the front section, the connecting channel, the middle section, the intercepting net cylinder and the rear section in sequence and is discharged from the outlet; the intercepting net cylinder rolls under the impact of the flow of the water, and the river garbage in the water passes through the feed port and is accommodated in the accommodating cavity.

[0009] Optionally, along the flow direction of the water body in the flood discharge channel, the diameter of the front section gradually decreases, the front section is arranged in a cone shape, and the water inlet is in an expanded shape.

[0010] Optionally, a steel grating is provided on the water inlet, which covers the water inlet and protrudes outward away from the flood discharge channel in a convex shape; the steel grating has a plurality of grating intervals arranged at intervals in the transverse direction, and the water body enters the flood discharge channel through the plurality of grating intervals.

[0011] Optionally, along the direction from the middle to the periphery of the steel bar grating, the steel bar grating is arranged inclined toward the base to form a frustum shape with a protruding middle portion.

[0012] Optionally, a rolling acceleration cylinder is provided in the middle section, and the acceleration cylinder has an acceleration track connected to or separated from the connecting channel, and the acceleration track runs through the end of the acceleration cylinder; the acceleration cylinder is arranged along the axial extension of the middle section and is rotationally connected to the middle section. When water enters the acceleration track from the connecting channel and flows along the acceleration track to the intercepting section, the acceleration cylinder is in a rolling state driven by the flow of water.

[0013] Optionally, the outer circumference of the acceleration cylinder is provided with a plurality of spiral grooves arranged at intervals, the plurality of spiral grooves are arranged along the axial extension of the acceleration cylinder, and are arranged spirally along the circumference of the acceleration cylinder, and the depth of the spiral grooves gradually increases along the extension direction of the spiral grooves.

[0014] Optionally, the spiral widths of the plurality of spiral grooves are different.

[0015] Optionally, the feed port has two axial walls arranged at intervals up and down, the axial walls are arranged along the axial extension of the intercepting net cylinder, and the two axial walls are enclosed to form the feed port; a plurality of elastic strips are provided on the axial wall, and the plurality of elastic strips are arranged at intervals along the length direction of the axial wall; one end of the elastic strip is connected to the axial wall, and the other end of the elastic strip extends obliquely into the accommodating cavity and is arranged obliquely toward the feed port;

[0016] An elastic gap is formed between the multiple elastic strips on the two axial walls, and the width of the elastic gap is smaller than the width of the feed port. When the water body flows toward the feed port, river garbage in the water body passes through the feed port, squeezing the multiple elastic strips on the two axial walls to elastically swing away from each other, the elastic gap increases, and the river garbage enters the accommodating cavity through the elastic gap. When the river garbage in the accommodating cavity flows toward the feed port, the multiple elastic strips on the two axial walls are squeezed to swing toward each other, the elastic gap decreases, and the river garbage in the accommodating cavity is restricted from passing through the elastic gap.

[0017] Optionally, an eccentric roller made of elastic material is provided in the accommodating chamber, and the eccentric roller is arranged along the axial extension of the intercepting net tube. Both ends of the accommodating chamber are respectively provided with hinged arms, one end of the hinged arm is hinged to the middle part of the intercepting net tube, and the other end of the hinged arm freely extends along the radial direction of the intercepting net tube; the ends of the eccentric roller are respectively rotatably connected to the other ends of the two hinged arms, and the eccentric roller is eccentrically arranged with respect to the central axis of the accommodating chamber;

[0018] When the water flows through the accommodating cavity, the water impacts the eccentric roller, and the eccentric roller swings back and forth around the central axis of the accommodating cavity.

[0019] Optionally, the two articulated arms have different lengths, the eccentric roller is arranged obliquely to the central axis of the accommodating chamber, and the eccentric roller is twisted and deformed during the reciprocating swing of the eccentric roller around the central axis of the accommodating chamber.

[0020] Compared with the prior art, the river flood control and drainage structure capable of cleaning river garbage provided by the present invention drives the rolling shaft to roll through a power structure, so that the connecting channel on the rolling shaft is connected to the flood discharge channel, and the rolling shaft acts as a gate, so that the water in the river can flow to the water outlet through the water inlet, thereby playing a role in flood control and drainage. In the process of the water body passing through the flood discharge channel, the water body carries the river garbage into the containing chamber through the feed port, and the river garbage is restricted and stored in the containing chamber, and the water in the containing chamber flows back to the flood discharge channel through the mesh holes. In the process again, the intercepting net cylinder rolls back and forth up and down while the feed port remains facing the water inlet under the impact of the water body, and the intercepting net cylinder can be pulled up and taken out through the longitudinal channel to clean the containing chamber, and the intercepting net cylinder is placed back to the intercepting section through the longitudinal channel. In this way, the river flood control and drainage is achieved while cleaning the river garbage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a river flood control and drainage structure capable of cleaning river garbage provided by the present invention;

[0022] Figure 2 is a cross-sectional schematic diagram of a base provided by the present invention;

[0023] Figure 3 is a cross-sectional schematic diagram of the acceleration cylinder provided by the present invention;

[0024] Figure 4 It is a cross-sectional schematic diagram of the interception section provided by the present invention;

[0025] Figure 5 It is a cross-sectional schematic diagram of the intercepting net cylinder provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0028] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Reference Figure 1-5 The figure shows a preferred embodiment of the present invention.

[0030] The river flood control and drainage structure capable of cleaning river garbage provided by the present invention comprises a base 100 arranged at a drainage position of the river, the base 100 having a water-facing surface facing the river, and a water-receiving surface facing away from the river; a flood discharge channel 110 is arranged in the base 100, the inner end of the flood discharge channel 110 penetrates the water-facing surface to form a water inlet, and the outer end of the flood discharge channel 110 penetrates the water-receiving surface to form a water outlet; along the direction from the water-facing surface to the water-receiving surface, the flood discharge channel 110 sequentially comprises a front section 111, a middle section 112 and a rear section 113;

[0031] The base 100 has a switch channel 200 arranged transversely, and the switch channel 200 is arranged between the front section 111 and the middle section 112. The switch channel 200 is provided with a rolling shaft 210 arranged in a rolling manner, and the rolling shaft 210 is connected to a power structure for driving the rolling shaft 210 to rotate horizontally, and a connecting channel 211 is provided in the rolling shaft 210; the power structure drives the rolling shaft 210 to roll, and when the connecting channel 211 is connected to the front section 111 and the middle section 112 respectively, the flood discharge channel 110 is in an open state, and when the connecting channel 211 is misaligned with the front section 111 and the middle section 112 respectively, the flood discharge channel 110 is in a closed state;

[0032] A longitudinal channel 300 is arranged longitudinally in the base 100, the bottom of the longitudinal channel 300 extends to between the middle section 112 and the rear section 113 to form a transversely arranged interception section, and the top of the longitudinal channel 300 passes through the top of the base 100; a horizontally arranged interception net cylinder 310 is provided in the interception section, the interception net cylinder 310 has a receiving cavity 311, and a plurality of mesh holes 312 are arranged on the periphery of the interception net cylinder 310; a feed port is provided on the interception net cylinder 310, and the feed port is arranged along the axial extension of the interception net cylinder 310, and a limiting structure is provided on the feed port to limit the river garbage in the receiving cavity 311 from being discharged outward through the feed port;

[0033] When the flood discharge channel 110 is in an open state, the water in the river flows through the front section 111, the connecting channel 211, the middle section 112, the intercepting net cylinder 310 and the rear section 113 in sequence and is discharged from the outlet; the intercepting net cylinder 310 rolls under the impact of the flow of the water, and the river garbage in the water passes through the feed port and is accommodated in the accommodating chamber 311.

[0034] The above-mentioned river flood control and drainage structure capable of cleaning up river garbage drives the rolling shaft 210 to roll through a power structure, so that the connecting channel 211 on the rolling shaft 210 is connected to the flood discharge channel 110, so that the water in the river can flow to the water outlet through the water inlet, and the rolling shaft 210 plays the role of a gate, playing the role of flood control and drainage. In the process of water passing through the flood discharge channel 110, the water carries the river garbage through the feed port into the containing chamber 311, and the river garbage is restricted and stored in the containing chamber 311. The water in the containing chamber 311 flows back to the flood discharge channel 110 through the mesh 312. In the process again, the intercepting net cylinder 310 is impacted by the water body, and the feed port is kept facing the water inlet while rolling back and forth up and down, and the intercepting net cylinder 310 can be pulled up and taken out through the longitudinal channel 300, and the containing chamber 311 is cleaned, and the intercepting net cylinder 310 is placed back to the intercepting section through the longitudinal channel 300. In this way, river flood control and drainage are achieved while cleaning up the river garbage.

[0035] In practical applications, multiple flood discharge channels 110 may be arranged according to the width of the base 100. Figure 2, to achieve rapid flood control and drainage.

[0036] Specifically, along the flow direction of the water in the flood discharge channel 110, the diameter of the front section 111 gradually decreases, the front section 111 is arranged in a cone shape, and the water inlet is expanded. In this way, more water flows into the water inlet, and the flow rate of the water in the flood discharge channel 110 is increased.

[0037] Specifically, a steel bar grid fence 120 is provided on the water inlet, which covers the water inlet and protrudes outward away from the flood discharge channel 110 in a convex shape; the steel bar grid fence 120 has a plurality of grid intervals arranged transversely, and the water enters the flood discharge channel 110 through the plurality of grid intervals. In this way, large objects such as stones can be isolated outside the flood discharge channel 110 through the steel bar grid fence 120, and some river garbage can also be broken and scattered.

[0038] Along the direction from the middle to the periphery of the steel bar grid fence 120, the steel bar grid fence 120 is arranged tilted toward the base 100 to form a frustum shape with a protruding middle portion. In this way, the isolation effect is better and the breaking and scattering effect is better.

[0039] The middle section 112 is provided with a rolling acceleration cylinder 400, which has an acceleration track 401 connected to or separated from the connecting channel 211, and the acceleration track 401 runs through the end of the acceleration cylinder 400; the acceleration cylinder 400 is arranged along the axial extension of the middle section 112 and is rotatably connected to the middle section 112. When the water enters the acceleration track 401 from the connecting channel 211 and flows along the acceleration track 401 to the intercepting section, the acceleration cylinder 400 is in a rolling state driven by the flow of the water. In this way, the water entering the acceleration track 401 from the middle section 112 increases its flow rate.

[0040] The outer circumference of the acceleration cylinder 400 is provided with a plurality of spiral grooves 402 arranged at intervals. The plurality of spiral grooves 402 are arranged along the axial extension of the acceleration cylinder 400 and spirally arranged along the circumference of the acceleration cylinder 400. The depth of the spiral grooves 402 gradually increases along the extension direction of the spiral grooves 402. In this way, when the water passes through the spiral grooves 402, the acceleration cylinder 400 rolls rapidly. Through the design of the plurality of spiral grooves 402 and the acceleration track 401, the water flow is accelerated and the garbage in the water is concentrated, which is convenient for subsequent interception net cylinder 310 to collect.

[0041] The spiral widths of the plurality of spiral grooves 402 are different. Thus, spiral grooves 402 of different widths have different capture effects on river garbage of different sizes. A wider spiral groove 402 is more likely to capture larger garbage, while a narrower spiral groove 402 may have a better separation effect on smaller or lighter garbage. Such a design allows the acceleration cylinder 400 to have a better separation effect on garbage of different sizes and types.

[0042] The feed port has two axial walls arranged at intervals in the upper and lower parts, and the axial walls are arranged along the axial extension of the interception net cylinder 310, and the two axial walls enclose the feed port; a plurality of elastic strips 320 are arranged at intervals along the length direction of the axial wall; one end of the elastic strip 320 is connected to the axial wall, and the other end of the elastic strip 320 extends obliquely into the accommodating cavity 311 and is arranged obliquely toward the feed port;

[0043] The multiple elastic strips 320 on the two axial walls are enclosed to form an elastic interval, and the width of the elastic interval is smaller than the width of the feed port. When the water flows toward the feed port, the river garbage in the water passes through the feed port, squeezing the multiple elastic strips 320 on the two axial walls to swing elastically away from each other, and the elastic interval increases, and the river garbage enters the accommodation cavity 311 through the elastic interval. When the river garbage in the accommodation cavity 311 flows toward the feed port, the multiple elastic strips 320 on the two axial walls are squeezed to swing toward each other, and the elastic interval decreases, limiting the river garbage in the accommodation cavity 311 from passing through the elastic interval. In this way, the river garbage in the accommodation cavity 311 is effectively limited from flowing out through the feed port to the flood discharge channel 110.

[0044] In this embodiment, an eccentric roller 340 made of elastic material is provided in the accommodating chamber 311. The eccentric roller 340 is arranged along the axial extension of the intercepting net cylinder 310. Both ends of the accommodating chamber 311 are respectively provided with hinged arms 330. One end of the hinged arm 330 is hinged to the middle of the intercepting net cylinder 310, and the other end of the hinged arm 330 freely extends along the radial direction of the intercepting net cylinder 310. The ends of the eccentric roller 340 are respectively corresponding to the other ends of the two hinged arms 330 for rotation connection. The eccentric roller 340 is eccentrically arranged with respect to the central axis of the accommodating chamber 311.

[0045] When the water flows through the accommodating chamber 311, the water impacts the eccentric roller 340, and the eccentric roller 340 swings back and forth around the central axis of the accommodating chamber 311. In this way, the swing of the eccentric roller 340 can effectively prevent garbage from accumulating or clogging in the accommodating chamber 311, keep the interception net cylinder 310 unobstructed, and ensure the normal operation of the flood control and drainage structure. At the same time, because the eccentric roller 340 is made of elastic material, it can adapt to the impact of water bodies with different flow rates and flow rates, has a certain buffering effect, and improves the adaptability and durability of the entire structure.

[0046] The two articulated arms 330 have different lengths, and the eccentric roller 340 is arranged obliquely with respect to the central axis of the accommodating chamber 311. The eccentric roller 340 is twisted and deformed during the reciprocating swing of the eccentric roller 340 around the central axis of the accommodating chamber 311. In this way, the stirring area is increased, the interception net cylinder 310 is kept unobstructed, and the water body is ensured to flow out through the mesh 312, forming a better flow path.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A river flood control and drainage structure capable of cleaning up river garbage, characterized in that: The invention comprises a base arranged at a drainage position of a river channel, the base having a water-facing surface facing the river channel, and a water-receiving surface facing away from the river channel; a flood discharge channel is arranged in the base, the inner end of the flood discharge channel penetrates the water-facing surface to form a water inlet, and the outer end of the flood discharge channel penetrates the water-receiving surface to form a water outlet; along the direction from the water-facing surface to the water-receiving surface, the flood discharge channel sequentially comprises a front section, a middle section and a rear section; The base has a switch channel arranged transversely, the switch channel is arranged between the front section and the middle section, a rolling shaft arranged in a rolling manner is provided in the switch channel, the rolling shaft is connected to a power structure driving the rolling shaft to rotate horizontally, and a connecting channel is provided in the rolling shaft; the power structure drives the rolling shaft to roll, when the connecting channel is connected to the front section and the middle section respectively, the flood discharge channel is in an open state, and when the connecting channel is misaligned with the front section and the middle section respectively, the flood discharge channel is in a closed state; The base is provided with a longitudinal channel arranged longitudinally, the bottom of the longitudinal channel extends to between the middle section and the rear section to form a transversely arranged interception section, and the top of the longitudinal channel passes through the top of the base; the interception section is provided with a horizontally arranged interception net cylinder, the interception net cylinder has a accommodating cavity, and the outer periphery of the interception net cylinder is provided with a plurality of mesh holes; the interception net cylinder is provided with a feed port, the feed port is arranged along the axial extension of the interception net cylinder, and the feed port is provided with a limiting structure that limits the river garbage in the accommodating cavity from being discharged outward through the feed port; When the flood discharge channel is in an open state, the water in the river flows through the front section, the connecting channel, the middle section, the interception net cylinder and the rear section in sequence and is discharged from the outlet; the interception net cylinder rolls under the impact of the flow of the water, and the river garbage in the water passes through the feed port and is contained in the containing cavity; The middle section is provided with a rolling acceleration cylinder, and the acceleration cylinder has an acceleration track connected to or separated from the connecting channel, and the acceleration track runs through the end of the acceleration cylinder; the acceleration cylinder is arranged along the axial extension of the middle section and is rotationally connected to the middle section, and when the water enters the acceleration track from the connecting channel and flows along the acceleration track to the intercepting section, the acceleration cylinder is in a rolling state driven by the flow of the water; The outer circumference of the acceleration cylinder is provided with a plurality of spiral grooves arranged at intervals, the plurality of spiral grooves are arranged along the axial direction of the acceleration cylinder, and spirally arranged along the circumference of the acceleration cylinder, and the depth of the spiral grooves gradually increases along the extending direction of the spiral grooves; The spiral widths of the plurality of spiral grooves are different; The feed port has two axial walls arranged at intervals in an upper and lower direction, the axial walls are arranged along the axial extension of the intercepting net cylinder, and the two axial walls are enclosed to form the feed port; a plurality of elastic strips are arranged on the axial wall, and the plurality of elastic strips are arranged at intervals along the length direction of the axial wall; one end of the elastic strip is connected to the axial wall, and the other end of the elastic strip extends obliquely into the accommodating cavity and is arranged obliquely toward the feed port; An elastic interval is formed between the multiple elastic strips on the two axial walls, and the width of the elastic interval is smaller than the width of the feed port; when the water body flows toward the feed port, the river garbage in the water body passes through the feed port, squeezing the multiple elastic strips on the two axial walls to elastically swing away from each other, the elastic interval increases, and the river garbage enters the accommodation cavity through the elastic interval; when the river garbage in the accommodation cavity flows toward the feed port, the multiple elastic strips on the two axial walls are squeezed to swing toward each other, the elastic interval decreases, and the river garbage in the accommodation cavity is restricted from passing through the elastic interval; An eccentric roller made of elastic material is arranged in the accommodating chamber, and the eccentric roller is arranged along the axial direction of the intercepting net tube. Both ends of the accommodating chamber are respectively provided with hinged arms, one end of the hinged arm is hinged to the middle part of the intercepting net tube, and the other end of the hinged arm freely extends along the radial direction of the intercepting net tube; the ends of the eccentric roller are respectively corresponding to the other ends of the two hinged arms for rotation connection, and the eccentric roller is eccentrically arranged with respect to the central axis of the accommodating chamber; When the water flows through the accommodating cavity, the water impacts the eccentric roller, and the eccentric roller swings back and forth around the central axis of the accommodating cavity.

2. The river flood control and drainage structure capable of cleaning river garbage as claimed in claim 1, characterized in that: Along the flow direction of the water body in the flood discharge channel, the diameter of the front section gradually decreases, the front section is arranged in a cone shape, and the water inlet is in an expanded shape.

3. The river flood control and drainage structure capable of cleaning river garbage as claimed in claim 1, characterized in that: A steel bar grid is provided on the water inlet, which covers the water inlet and protrudes outward away from the flood discharge channel in a convex shape; the steel bar grid has a plurality of grid intervals arranged at intervals in the transverse direction, and the water body enters the flood discharge channel through the plurality of grid intervals.

4. The river flood control and drainage structure capable of cleaning river garbage as claimed in claim 3, characterized in that: Along the direction from the middle to the periphery of the steel bar grid, the steel bar grid is arranged obliquely toward the base to form a frustum shape with a protruding middle portion.

5. The river flood control and drainage structure capable of cleaning river garbage as claimed in any one of claims 1 to 4, characterized in that: The two articulated arms have different lengths, the eccentric roller is arranged obliquely to the central axis of the accommodating cavity, and the eccentric roller is twisted and deformed during the reciprocating swing of the eccentric roller around the central axis of the accommodating cavity.

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