Medicament feeding device for soil pollution remediation

Abstract

The invention relates to the technical field of soil remediation, in particular to a soil pollution remediation agent feeding device which comprises a rolling assembly, a plurality of feeding assemblies arranged on the rolling assembly and a connecting assembly used for being connected with an external machine. The rolling assembly is of a cylindrical structure, and a plurality of throwing assemblies are evenly distributed on the outer surface of the rolling assembly. The rolling assembly is connected with an external machine through the connecting assembly; driving force is provided through an external machine to drive the rolling assembly to advance on the ground; the feeding device further comprises a material conveying assembly. The material conveying assembly provides a liquid repairing agent for the rolling assembly with the hollow interior. A passage for conveying a repairing agent is reserved between the rolling assembly and the putting assembly; in the advancing process of the rolling assembly, the putting assembly is inserted into the soil under the gravity effect of the rolling assembly, the output end is kept in an open state, and the putting assembly is used for conveying the liquid remediation agent into the soil to complete agent putting. Remediation agents can be conveniently put into soil, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, in particular to a device for delivering a drug for soil pollution remediation. Background Art

[0002] Soil remediation refers to the use of physical, chemical and biological methods to transfer, absorb, degrade and transform pollutants in the soil to reduce their concentration to an acceptable level, or to transform toxic and harmful pollutants into harmless substances. Fundamentally speaking, the technical principles of contaminated soil remediation may include: (1) changing the form of pollutants in the soil or the way they bind to the soil, reducing their mobility and bioavailability in the environment; (2) reducing the concentration of harmful substances in the soil;

[0003] The conventional soil remediation method is to prepare different remediation agents according to the type of pollutant and then apply them to the soil; however, applying the agents on the soil surface is not conducive to absorption, so how to efficiently turn over the soil and apply the agents has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a soil pollution remediation agent delivery device to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: A soil pollution remediation agent delivery device, comprising a rolling assembly, a plurality of delivery assemblies arranged on the rolling assembly, and a connection assembly for connecting with an external machine;

[0006] The rolling assembly is a cylindrical structure, and a plurality of delivery assemblies are evenly distributed on its outer surface; the connecting assembly connects the rolling assembly with an external machine; the external machine provides driving force to drive the rolling assembly to move on the ground;

[0007] The delivery device further comprises a feeding component; the feeding component provides liquid repair agent to the hollow rolling component; a passage for delivering the repair agent is reserved between the rolling component and the delivery component;

[0008] When the rolling component is moving, the delivery component is inserted into the soil under the action of the gravity of the rolling component, and the output end remains open to transport the liquid repair agent into the soil to complete the delivery of the agent.

[0009] Preferably, the rolling assembly includes a limit ring, a first rotating disk, and a second rotating disk;

[0010] Two groups of limit rings are symmetrically arranged, respectively located on the left and right sides of the rolling assembly; the limit rings are connected to the main body of the rolling assembly through bearings and maintain relative rolling;

[0011] The first rotating disk is installed on one side of the rolling assembly, and the second rotating disk is installed on the other side of the rolling assembly; the first rotating disk and the second rotating disk are both kept in rolling connection with the rolling assembly through bearings;

[0012] The first rotating disc is used to connect with the feeding component, and the feeding component passes through the first rotating disc and is inserted into the rolling component to transport the liquid repair agent;

[0013] The second turntable is used for assembly and installation in combination with the connecting assembly to form a supporting structure.

[0014] Preferably, a plurality of positioning members are provided on the limiting ring for connection with the lifting hook, so as to facilitate the lifting or transfer and transportation of the entire device by engineering machinery.

[0015] Preferably, a limiter is provided inside the hollow rolling assembly;

[0016] The bottom of the limiting member is in an arc shape, and a plurality of through holes are reserved in the middle for the material feeding assembly to be installed in cooperation; the limiting member adds a counterweight inside the rolling assembly and limits the material feeding assembly at the same time.

[0017] Preferably, a plurality of drain grooves are preset along the inner wall of the rolling assembly; the positions where the drain grooves are installed correspond to the delivery assembly;

[0018] A passage is formed between the drain trough and the delivery component, which facilitates the delivery of the liquid repair agent to the delivery component.

[0019] Preferably, the delivery assembly includes a support seat, a housing, a rotatable movable part and a connecting shaft;

[0020] The support seat provides a mounting platform for other components of the delivery assembly, and the support seat is directly fixed to the outer surface of the rolling assembly;

[0021] The housing is formed by splicing two triangular metal sheets, the ends of which form a conical structure; the joints at the splicing parts form hard metal edges and are arranged in the direction of travel of the rolling assembly;

[0022] The movable part is rotatably arranged on one side of the belly of the shell through a connecting shaft, and a torsion spring is arranged on the connecting shaft; the end of the movable part and the end of the shell form a closed structure, clamping the outlet of the hose arranged on the support seat so that it will not leak out; after the delivery assembly comes into contact with the soil, the movable part is squeezed by the soil and rotates relative to the connecting shaft, opening the outlet of the hose, so that the liquid repair agent can be delivered into the soil.

[0023] Preferably, the movable member is a triangular metal sheet; after its end is closed with the shell, its bottom is inclined toward a side away from the shell.

[0024] Preferably, the connecting assembly includes a crank, a connecting frame and an auxiliary rod;

[0025] The crank is "L" shaped, one end of which is connected to the second turntable, and the other end is connected to the connecting frame through a connecting piece; the connecting piece is a ball cage type universal joint;

[0026] The connecting frame is used to connect with external mechanical equipment to transmit driving force;

[0027] Two groups of auxiliary rods are symmetrically arranged to provide auxiliary support between the crank and the connecting frame.

[0028] Preferably, the auxiliary rod comprises a fixed rod, a movable rod and a sleeve;

[0029] The sleeve is located in the middle, one end of the movable rod is inserted into the sleeve, and the other end is connected to the positioning piece on the limiting ring and kept fixed; the outer periphery of the movable rod is sleeved with a first spring to provide elastic force between the sleeve and the positioning piece;

[0030] A positioning plate is arranged on the connecting frame; one end of the fixing rod is fixed on the outer shell of the sleeve, and the other end is arranged toward the positioning plate, leaving a certain space between the fixing rod and the positioning plate, and maintaining a non-contact state; the second spring is sleeved on the outer circumference of the fixing rod, one end of which is fixed to the positioning plate, and the other end is fixed to the end face of the sleeve.

[0031] Preferably, the material delivery component includes an outer conduit and an inner conduit;.

[0032] The outer conduit is a hard tube, one end of which is connected to the material box, and the other end is inserted into the rolling assembly to communicate with the inner conduit;

[0033] The inner conduit is provided with a plurality of branch pipes in the hollow part of the rolling assembly, and the branch pipes pass through the through hole of the limiter; the limiter is used for limiting the position; the liquid repair agent flows through the outer conduit and the inner conduit in sequence through the material box and enters the rolling assembly; and then enters the hose through the leakage groove, and after the output end of the delivery assembly is opened, the liquid repair agent is delivered into the soil.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention can move in a designated area by setting a rolling assembly in conjunction with a mechanical device drive; cooperate with multiple groups of delivery assemblies set on the rolling assembly to synchronously deliver the repair agent into the soil during the movement of the device; because the delivery assembly body is relatively slender and moves with the rolling assembly, when it is pulled out of the soil, the surrounding soil automatically covers the delivery site; the agent can be well pre-buried in the soil, further improving the effect of the agent delivery;

[0036] The present invention connects the rolling assembly to the mechanical equipment through a connecting assembly; connects to the connecting frame through a set crank, and provides auxiliary support through two groups of symmetrical auxiliary rods; thus, the stability of the entire connecting assembly is improved, and the bumps and vibrations during movement are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A three-dimensional diagram of a delivery device in an embodiment of the present invention;

[0038] Figure 2 It is a right side perspective view of the delivery device in an embodiment of the present invention;

[0039] Figure 3 It is a left perspective view of the delivery device in an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the assembly structure of the limiter in the rolling assembly in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the internal structure of a rolling assembly in an embodiment of the present invention;

[0042] Figure 6 It is a schematic diagram of the structure of the limiter in the embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the delivery component in an embodiment of the present invention;

[0044] Figure 8 An exploded diagram of a delivery component in an embodiment of the present invention;

[0045] Fig. 9 A partial enlarged view of the auxiliary rod in the embodiment of the present invention;

[0046] Fig.10 Schematic diagram of the assembly structure of the auxiliary rod and the crank in an embodiment of the present invention.

[0047] In the figure: 1. rolling assembly; 11. limiting ring; 12. positioning member; 13. first turntable; 14. second turntable; 15. limiting member; 16. leakage groove; 17. through hole; 2. delivery assembly; 21. support seat; 22. shell; 23. movable member; 24. connecting shaft; 25. hose; 3. connecting assembly; 31. crank; 311. limiting hole; 32. connecting frame; 33. auxiliary rod; 331. sleeve; 332. movable rod; 333. first spring; 334. fixed rod; 335. second spring; 336. positioning plate; 34. connecting member; 4. feeding assembly; 41. outer conduit; 42. inner conduit. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Example 1

[0050] A soil pollution remediation agent delivery device comprises a rolling component 1, a plurality of delivery components 2 arranged on the rolling component 1, and a connection component 3 for connecting with an external machine;

[0051] The rolling component 1 is a cylindrical structure, which is convenient for movement in the field; a plurality of delivery components 2 are evenly distributed on its outer surface; the connecting component 3 connects the rolling component 1 with an external machine; the driving force is provided by the external machine to drive the rolling component 1 to move on the ground; common external machines can use agricultural machinery such as tractors; when used on smaller plots of land, the device can also be manually pushed to operate.

[0052] The delivery device also includes a feeding component 4; the feeding component 4 provides liquid repair agent to the internally hollow rolling component 1; a passage for conveying the repair agent is reserved between the rolling component 1 and the delivery component 2; when the rolling component 1 is moving, the delivery component 2 is inserted into the soil under the action of the gravity of the rolling component 1, and the output end remains in an open state, which is used to transport the liquid repair agent into the soil to complete the agent delivery.

[0053] In an optional embodiment, the rolling assembly 1 includes a limit ring 11, a first turntable 13, and a second turntable 14; the limit ring 11 is symmetrically arranged in two groups, respectively located on the left and right sides of the rolling assembly 1; the limit ring 11 is connected to the main body of the rolling assembly 1 through a bearing and maintains relative rolling; the first turntable 13 is installed on one side of the rolling assembly 1, and the second turntable 14 is installed on the other side of the rolling assembly 1; the first turntable 13 and the second turntable 14 are both connected to the rolling assembly 1 through a bearing to maintain rolling connection; the first turntable 13 is used to connect with the feeding assembly 4, and the feeding assembly 4 passes through the first turntable 13 and is inserted into the rolling assembly 1 to transport liquid repair agents; the second turntable 14 is used to be installed in combination with the connecting assembly 3 to form a supporting structure. A number of positioning members 12 are arranged on the limit ring 11 for connecting with the hook, so as to facilitate the engineering machinery to lift or transfer the entire device. A limiter 15 is provided inside the hollow rolling assembly 1; the bottom of the limiter 15 is arc-shaped, and a plurality of through holes 17 are reserved in the middle for the material feeding assembly 4 to be installed; the limiter 15 adds a counterweight inside the rolling assembly 1 and limits the material feeding assembly 4 at the same time. Multiple leakage grooves 16 are preset along the inner wall of the rolling assembly 1; the position where the leakage grooves 16 are installed corresponds to the delivery assembly 2; a passage is formed between the leakage grooves 16 and the delivery assembly 2, which facilitates the delivery of liquid repair agents to the delivery assembly 2.

[0054] In an optional embodiment, the delivery component 2 includes a support seat 21, a shell 22, a rotatable movable part 23 and a connecting shaft 24; the support seat 21 provides an installation platform for other components of the delivery component 2, and the support seat 21 is directly fixed to the outer surface of the rolling component 1; the shell 22 is spliced ​​by two triangular metal sheets, and its ends form a conical structure; the joints at the splicing parts form hard metal edges and are arranged toward the travel direction of the rolling component 1; the movable part 23 is rotatably arranged on the belly side of the shell 22 through the connecting shaft 24, and a torsion spring is arranged on the connecting shaft 24; the end of the movable part 23 and the end of the shell 22 form a closed structure, clamping the outlet of the hose 25 arranged on the support seat 21 so that it does not leak liquid to the outside; after the delivery component 2 comes into contact with the soil, the movable part 23 is squeezed by the soil and rotates relative to the connecting shaft 24 to open the outlet of the hose 25, so that it can deliver liquid repair agent into the soil.

[0055] Preferably, the movable member 23 is a triangular metal sheet; after its end is closed with the shell 22 , its bottom is inclined toward a side away from the shell 22 .

[0056] In an optional embodiment, the connecting component 3 includes a crank 31, a connecting frame 32 and an auxiliary rod 33; the crank 31 is "L"-shaped, one end of which is connected to the second turntable 14, and the other end is connected to the connecting frame 32 through a connecting member 34; the connecting member 34 is a ball cage universal joint, and the connecting member 34 can play a buffering role during the movement of the rolling component 1, which is beneficial to reduce the vibration of one end of the connecting component 3; the connecting frame 32 is used to connect to external mechanical equipment to transmit driving force; the auxiliary rods 33 are symmetrically arranged in two groups for auxiliary support between the crank 31 and the connecting frame 32.

[0057] In an optional embodiment, the auxiliary rod 33 includes a fixed rod 334, a movable rod 332 and a sleeve 331; the sleeve 331 is located in the middle, one end of the movable rod 332 is inserted into the sleeve 331, and the other end is connected to the positioning member 12 on the limiting ring 11 and remains fixed; the outer periphery of the movable rod 332 is sleeved with a first spring 333 for providing elastic force between the sleeve 331 and the positioning member 12; a positioning plate 336 is provided on the connecting frame 32; one end of the fixed rod 334 is fixed to the outer shell of the sleeve 331, and the other end is arranged toward the positioning plate 336, and is aligned with the positioning plate 336 A certain space is left between them and they remain in a non-contact state; the second spring 335 is sleeved on the outer circumference of the fixed rod 334, one end of which is fixed to the positioning plate 336, and the other end is fixed to the end face of the sleeve 331; the auxiliary rod 33 plays an auxiliary supporting role for the rolling component 1 and the connecting component 3; since one end of the fixed rod 334 is fixed to the outer shell of the sleeve 331, and the other end is arranged toward the positioning plate 336, a certain space is left between the positioning plate 336 and they remain in a non-contact state, so that the connecting frame 32 can be twisted with the auxiliary rod 33 by a certain angle, which is beneficial to reduce vibration.

[0058] In an optional embodiment, the feeding component 4 includes an outer conduit 41 and an inner conduit 42; the outer conduit 41 is a hard tube, one end of which is connected to the material box, and the other end is inserted into the rolling component 1 and communicated with the inner conduit 42; the inner conduit 42 is provided with a plurality of branch pipes in the hollow part of the rolling component 1, and the branch pipes pass through the through hole 17 of the limiter 15; the limiter 15 is used for limiting; the liquid repair agent flows through the material box through the outer conduit 41 and the inner conduit 42 in turn into the rolling component 1; and then enters the hose 25 through the leakage groove 16, and after the output end of the delivery component 2 is opened, the liquid repair agent is delivered into the soil.

[0059] In this embodiment, the external mechanical device and the rolling component 1 are first connected through the connecting component 3, and the driving force provided by the external mechanical device drives the rolling component 1 to move; during the movement, the material box supplies liquid to the rolling component 1 through the feeding component 4, and the liquid repair agent flows through the material box through the outer conduit 41 and the inner conduit 42 in sequence into the rolling component 1; and then enters the hose 25 through the leakage groove 16; since the limiter 15 is arranged inside the rolling component 1 to play the role of counterweight, the repair agent filled between the limiter 15 and the inner wall of the rolling component 1 can also have a certain lubrication effect; when there is more repair agent, the limiter 15 can float up and cooperate with the liquid level sensor to monitor the internal liquid level height in real time, thereby further controlling the liquid supply of the feeding component 4;

[0060] During the rotation of the rolling assembly 1, the shell 22 of the delivery assembly 2 is first inserted into the soil under the action of the gravity of the entire rolling assembly 1, and since the movable part 23 is a triangular metal sheet; after its end is closed with the shell 22, the bottom is inclined toward the side away from the shell 22, and when it is squeezed by the soil; the bottom of the movable part 23 is subjected to greater force, so it will rotate a certain angle around the connecting shaft 24, so that the outlet of the hose 25 is opened, so that it can deliver liquid repair agents into the soil; and when the delivery assembly 2 is pulled out of the soil, the surrounding soil will cover the delivery site; at the same time, the movable part 23 can be reset under the elastic action of the torsion spring; prepare for the next delivery operation. The present invention can be used in conjunction with mechanical equipment such as tractors to conveniently deliver repair agents to the soil; at the same time, delivery assemblies 2 of different lengths can be set as needed to meet the delivery requirements of soils of different depths.

[0061] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil pollution remediation agent delivery device, characterized in that: It comprises a rolling component (1), a plurality of delivery components (2) arranged on the rolling component (1), and a connection component (3) for connecting with an external machine; The rolling assembly (1) is a cylindrical structure, and a plurality of delivery assemblies (2) are evenly distributed on its outer surface; the connecting assembly (3) connects the rolling assembly (1) to an external machine; the external machine provides driving force to drive the rolling assembly (1) to move on the ground; The delivery device further comprises a feeding component (4); the feeding component (4) provides liquid repair agent to the rolling component (1) which is hollow inside; a passage for delivering the repair agent is reserved between the rolling component (1) and the delivery component (2); When the rolling component (1) is moving, the delivery component (2) is inserted into the soil under the action of the gravity of the rolling component (1), and the output end remains in an open state, so as to transport the liquid repair agent into the soil, thereby completing the delivery of the agent.

2. The soil pollution remediation agent delivery device according to claim 1, characterized in that: The rolling assembly (1) comprises a limiting ring (11), a first rotating disk (13), and a second rotating disk (14); Two groups of limiting rings (11) are symmetrically arranged, respectively located on the left and right sides of the rolling assembly (1); the limiting rings (11) are connected to the main body of the rolling assembly (1) through bearings and maintain relative rolling; The first rotating disk (13) is mounted on one side of the rolling assembly (1), and the second rotating disk (14) is mounted on the other side of the rolling assembly (1); the first rotating disk (13) and the second rotating disk (14) are both in rolling connection with the rolling assembly (1) via bearings; The first rotating disk (13) is used to be connected to the feeding component (4), and the feeding component (4) passes through the first rotating disk (13) and is inserted into the interior of the rolling component (1) to transport the liquid repair agent; The second rotating disk (14) is used to be assembled with the connecting assembly (3) to form a supporting structure.

3. The soil pollution remediation agent delivery device according to claim 2, characterized in that: A plurality of positioning members (12) are arranged on the limiting ring (11) for connection with the lifting hook, so as to facilitate the lifting or transfer and transportation of the entire device by engineering machinery.

4. The soil pollution remediation agent delivery device according to claim 3, characterized in that: A limiting member (15) is arranged inside the hollow rolling component (1); The bottom of the limiting member (15) is in an arc shape, and a plurality of through holes (17) are reserved in the middle for the material feeding assembly (4) to be installed in cooperation; the limiting member (15) adds a counterweight inside the rolling assembly (1) and limits the material feeding assembly (4) at the same time.

5. The soil pollution remediation agent delivery device according to claim 4, characterized in that: A plurality of leakage grooves (16) are preset along the inner wall of the rolling component (1); the positions at which the leakage grooves (16) are installed correspond to the delivery component (2); A passage is formed between the drain groove (16) and the delivery component (2), which facilitates the delivery of the liquid repair agent to the delivery component (2).

6. The soil pollution remediation agent delivery device according to claim 1, characterized in that: The delivery assembly (2) comprises a support seat (21), a housing (22), a rotatable movable part (23) and a connecting shaft (24); The support seat (21) provides a mounting platform for other components of the delivery assembly (2), and the support seat (21) is directly fixed on the outer surface of the rolling assembly (1); The housing (22) is formed by splicing two triangular metal sheets, the ends of which form a conical structure; the joint at the splicing position forms a hard metal edge and is arranged toward the travel direction of the rolling assembly (1); The movable part (23) is rotatably arranged on one side of the belly of the shell (22) via a connecting shaft (24), and a torsion spring is arranged on the connecting shaft (24); the end of the movable part (23) and the end of the shell (22) form a closed structure, clamping the outlet of the hose (25) arranged on the support seat (21) so that it will not leak liquid outward; after the delivery component (2) contacts the soil, the movable part (23) is squeezed by the soil and rotates relative to the connecting shaft (24), opening the outlet of the hose (25), so that the liquid repair agent can be delivered into the soil.

7. The soil pollution remediation agent delivery device according to claim 6, characterized in that: The movable member (23) is a triangular metal thin plate; after its end is closed with the shell (22), its bottom is inclined toward a side away from the shell (22).

8. The soil pollution remediation agent delivery device according to claim 1, characterized in that: The connecting assembly (3) comprises a crank (31), a connecting frame (32) and an auxiliary rod (33); The crank (31) is L-shaped, one end of which is connected to the second rotating disk (14), and the other end of which is connected to the connecting frame (32) through a connecting member (34); the connecting member (34) is a ball cage type universal joint; The connecting frame (32) is used to connect with external mechanical equipment to transmit driving force; Two groups of auxiliary rods (33) are symmetrically arranged to provide auxiliary support between the crank (31) and the connecting frame (32).

9. The soil pollution remediation agent delivery device according to claim 8, characterized in that: The auxiliary rod (33) comprises a fixed rod (334), a movable rod (332) and a sleeve (331); The sleeve (331) is located in the middle, one end of the movable rod (332) is inserted into the sleeve (331), and the other end is connected to the positioning piece (12) on the limiting ring (11) and is kept fixed; a first spring (333) is sleeved on the outer periphery of the movable rod (332) to provide elastic force between the sleeve (331) and the positioning piece (12); A positioning plate (336) is arranged on the connecting frame (32); one end of the fixing rod (334) is fixed on the outer shell of the sleeve (331), and the other end is arranged toward the positioning plate (336), leaving a certain space between the fixing rod (334) and the positioning plate (336) and maintaining a non-contact state; the second spring (335) is sleeved on the outer periphery of the fixing rod (334), one end of the fixing rod (334) is fixed to the positioning plate (336), and the other end is fixed to the end surface of the sleeve (331).

10. The soil pollution remediation agent delivery device according to claim 1, characterized in that: The material conveying component (4) comprises an outer conduit (41) and an inner conduit (42). The outer conduit (41) is a hard tube, one end of which is connected to the material box, and the other end is inserted into the rolling assembly (1) and communicated with the inner conduit (42); The inner conduit (42) is provided with a plurality of branch pipes in the hollow part of the rolling assembly (1), and the branch pipes pass through the through hole (17) of the limiting member (15); the limiting member (15) is used for limiting; the liquid repair agent flows through the material box, through the outer conduit (41), the inner conduit (42) in sequence, and enters the rolling assembly (1); then enters the hose (25) through the leakage groove (16), and after the output end of the delivery assembly (2) is opened, the liquid repair agent is delivered into the soil.

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