Obstacle-clearing robot for highway and working method thereof

Abstract

The present invention discloses a highway obstacle-clearing robot and its working method, and relates to the field of highway clearing. A highway obstacle-clearing robot comprises two symmetrically arranged support frames, and further comprises: a roller shaft rotatably connected between the two support frames, wherein a plurality of sliding cavities are equidistantly opened on the circumference of the roller shaft, each of the sliding cavities is slidably connected to an electromagnetic block, and the end of the electromagnetic block located outside the sliding cavity is a magnetic surface; two elastic airbags are symmetrically arranged in the sliding cavities; the present invention combines the two methods of shifting and spraying air into the gap, so that it can better change metal objects and non-metallic objects from a tightly stuck state to a loose state, facilitating the subsequent magnetic adsorption of metal objects and the cleaning of non-metallic objects by a brush and a shovel. The obstacle-clearing robot can better clean metal objects and non-metallic objects stuck in the gap.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway clearing, and in particular relates to an obstacle-clearing robot for highways and a working method thereof. Background Art

[0002] When a vehicle collides on the highway, parts of the vehicle may fall off due to the force of the impact. For example, the bumper, body shell and other parts of the car are fixed with screws and other connectors. The violent collision may cause these screws to loosen or even fall off. In the process of the vehicle rolling, the chassis, suspension system and other components may also be damaged. The screws, bolts and other metal parts will be scattered on the road. Therefore, after the accident, the road surface needs to be cleaned in time to prevent the screws, bolts and other metal parts scattered on the road from damaging the tires of passing vehicles and posing a serious safety hazard.

[0003] However, currently, cleaning equipment is often used to clean up metal pieces scattered on the road after a collision. However, for some metal pieces stuck in the gaps of the road, cleaning them only by cleaning is not effective, so the present invention is proposed in view of this. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a highway obstacle removal robot and a working method thereof that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A roadblock clearing robot for highways, comprising two symmetrically arranged support frames, and further comprising: a roller shaft rotatably connected between the two support frames, wherein a plurality of sliding cavities are equidistantly provided on the circumference of the roller shaft, an electromagnetic block is slidably connected in each sliding cavity, and one end of the electromagnetic block located outside the sliding cavity is a magnetic surface; two elastic airbags are symmetrically arranged in the sliding cavity, wherein one end of the elastic airbag is fixedly connected to the electromagnetic block, and the other end is fixedly connected to the inner wall of the sliding cavity, a hollow cavity 1 is provided in the roller shaft between two adjacent electromagnetic blocks, an air jet hole connected to the hollow cavity 1 is provided on the roller shaft, a conduit 1 connected to the elastic airbag is provided on the roller shaft, a conduit 2 is provided in the roller shaft, one end of the conduit 2 is connected to the elastic airbag, and the other end is connected to the hollow cavity 1.

[0007] Preferably, two springs 1 are further included, and the two springs 1 are symmetrically arranged in the sliding cavity. One end of the spring 1 is fixedly connected to the inner wall of the sliding cavity, and the other end is fixedly connected to the electromagnetic block.

[0008] In order to control the switch of the electromagnetic block and facilitate the cleaning of the screws adsorbed on the electromagnetic block, preferably, it also includes a conductive block 1 and a conductive block 2 arranged in the sliding cavity to control the switch of the electromagnetic block. The conductive block 1 is slidably connected in the sliding cavity, and the conductive block 2 is embedded in the electromagnetic block.

[0009] In order to enable the conductive block 1 to slide smoothly in the sliding cavity, it further includes two multi-stage telescopic rods, which are symmetrically fixedly connected to the inner wall of the sliding cavity, and the telescopic ends of the multi-stage telescopic rods are fixedly connected to the conductive block 1. A spring 2 is sleeved on the multi-stage telescopic rod, and one end of the spring 2 is fixedly connected to the conductive block 1, and the other end is fixedly connected to the inner wall of the sliding cavity.

[0010] In order to drive the roller to drive the electromagnetic blocks to rotate so that the multiple electromagnetic blocks can better clean the screws on the road surface, preferably, a motor is fixedly mounted on the support frame, and the roller is fixedly connected to the output end of the motor.

[0011] In order to facilitate the cleaning of large debris on the road, it further includes a bulldozer, and the two support frames are rotatably connected to the two ends of the bulldozer. Both ends of the bulldozer are rotatably connected to a hydraulic telescopic rod, and the support frame is rotatably connected to the telescopic end of the hydraulic telescopic rod.

[0012] In order to facilitate the cleaning of garbage and non-metallic parts on the road surface and thus improve the cleaning effect, further, multiple groups of brushes are fixedly installed on the outer wall of the roller shaft between two adjacent electromagnetic blocks, and each group of brushes is provided with multiple brushes, and the brushes are used in conjunction with the push shovel.

[0013] In order to allow the metal to fall into the bulldozer better when it falls from the electromagnetic block, preferably, a hollow cavity 2 is opened in the electromagnetic block, and a plurality of air nozzles connected to the hollow cavity 2 are fixedly installed on one side of the electromagnetic block. The air nozzles are arranged at an angle, and the electromagnetic block is provided with branch pipes respectively connected to the hollow cavity 2 and the hollow cavity 1.

[0014] In order to increase the friction coefficient between the electromagnetic block and the metal part, preferably, anti-slip grooves are provided on one side of the electromagnetic block.

[0015] The working method of the obstacle removal robot includes the following steps:

[0016] Step 1: When cleaning metal objects on the road, the electromagnetic block on the roller is brought close to the ground, and then the electromagnetic block is turned on. The magnetic surface of the electromagnetic block generates a magnetic field, which enables it to absorb and clean the metal objects on the road;

[0017] Step 2: During cleaning, the electromagnetic block is driven to rotate synchronously by the rolling roller. When the electromagnetic block contacts the metal object stuck in the gap but exposed on the road surface, it can move the metal object to loosen it;

[0018] Step 3: When the rotating electromagnetic block contacts the road surface, it retracts into the sliding cavity and compresses the elastic airbag, causing the gas to be transported through the second conduit into the air jet hole and sprayed toward the gap, blowing away dust and debris around the metal object and loosening the metal object.

[0019] Step 4: After completing the cleaning of metal objects on the road, turn off the electromagnetic block to make it lose its magnetic attraction, and then you can clean the metal objects that have fallen from the electromagnetic block.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] The present invention combines the two methods of stirring and spraying air into the gap, so that it can better change metal objects and non-metallic objects from a tightly stuck state to a loose state, making it easier to subsequently adsorb metal objects through magnetic force and clean non-metallic objects through a brush and a shovel. The obstacle removal robot can better clean metal objects and non-metallic objects stuck in the gap.

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the attached figure:

[0024] Figure 1 This is a schematic diagram of the structure of the present invention Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention Figure 2 ;

[0026] Figure 3 This is a cross-sectional view of the roller and electromagnetic block of the present invention. Figure 1 ;

[0027] Figure 4 This is a cross-sectional view of the roller and electromagnetic block of the present invention. Figure 2 ;

[0028] Figure 5 It is a schematic diagram of the internal structure of the roller shaft of the present invention;

[0029] Figure 6 The present invention Figure 3 Enlarged view of part A;

[0030] Figure 7 The present invention Figure 5Magnified view of part B.

[0031] In the figure: 1. Dozer; 101. Support frame; 102. Roller; 103. Hydraulic telescopic rod; 104. Motor; 2. Sliding chamber; 201. Electromagnetic block; 202. Spring 1; 203. Multi-stage telescopic rod; 204. Conductive block 1; 205. Conductive block 2; 206. Spring 2; 207. Anti-slip groove; 3. Brush; 4. Elastic airbag; 401. Catheter 1; 402. Catheter 2; 403. Hollow cavity 1; 404. Jet hole; 5. Branch pipe; 501. Hollow cavity 2; 502. Jet nozzle. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0033] Example 1:

[0034] Reference Figure 3 、 Figure 4 、 Figure 5 A highway obstacle-clearing robot comprises two symmetrically arranged support frames 101, and further comprises: a roller shaft 102 rotatably connected between the two support frames 101, wherein the roller shaft 102 is provided with a plurality of sliding cavities 2 equidistantly arranged on the circumference, and an electromagnetic block 201 is slidably connected in each sliding cavity 2, and one end of the electromagnetic block 201 located outside the sliding cavity 2 is a magnetic surface; two elastic airbags 4 are symmetrically arranged in the sliding cavity 2, wherein one end of the elastic airbag 4 is connected to the electromagnetic block 201. 201 is fixedly connected, and the other end is fixedly connected to the inner wall of the sliding cavity 2. A hollow cavity 1 403 is opened in the roller shaft 102 between two adjacent electromagnetic blocks 201. An air injection hole 404 connected to the hollow cavity 1 403 is opened on the roller shaft 102. A conduit 1 401 connected to the elastic airbag 4 is provided on the roller shaft 102. A conduit 2 402 is provided in the roller shaft 102. One end of the conduit 2 402 is connected to the elastic airbag 4, and the other end is connected to the hollow cavity 1 403.

[0035] It also includes two springs 1 202 , which are symmetrically arranged in the sliding cavity 2 , one end of the spring 1 202 is fixedly connected to the inner wall of the sliding cavity 2 , and the other end is fixedly connected to the electromagnetic block 201 .

[0036] A motor 104 is fixedly mounted on the support frame 101 , and the roller shaft 102 is fixedly connected to the output end of the motor 104 .

[0037] When clearing obstacles on the road, the electromagnetic block 201 on the roller 102 is brought close to the ground, and then the electromagnetic block 201 is turned on. The magnetic surface of the electromagnetic block 201 generates an adsorption force, which enables it to adsorb and clean metal objects on the road.

[0038] In addition, some sharp metal objects stuck in the gap but exposed on the road surface can also be adsorbed and cleaned by the magnetic surface on the electromagnetic block 201. At the same time, when cleaning, the motor 104 is started, the motor 104 drives the roller 102 to rotate, and the roller 102 drives the electromagnetic block 201 to rotate synchronously. When one side of the electromagnetic block 201 contacts the metal object stuck in the gap but exposed on the road surface, it can move the relatively firm metal object stuck in the gap to loosen it, thereby facilitating the magnetic surface of the electromagnetic block 201 to adsorb and clean the metal object stuck in the gap, thereby improving the cleaning effect.

[0039] At the same time, when the rotating electromagnetic block 201 contacts the road surface, the electromagnetic block 201 is squeezed and retracted into the sliding cavity 2, and the spring 1 202 and the elastic airbag 4 are compressed (it should be noted that since the magnetic surface of the electromagnetic block 201 is an arc surface, when the electromagnetic block 201 contacts the road surface, it can avoid being stuck with the ground, so that the electromagnetic block 201 can smoothly retract into the sliding cavity 2). At this time, the gas in the elastic airbag 4 is filled into the hollow cavity 1 403 through the conduit 2 402 and is ejected through the jet hole 404, so that it is sprayed into the gap, thereby causing the metal Dust and debris around the object are blown away, which helps loosen the metal object. At the same time, the impact force of the gas can also slightly loosen the metal object, making it easier for the electromagnetic block 201 to absorb and clean it. Then, when the electromagnetic block 201 separates from the road surface, the compressed spring 1 202 generates a thrust, which pushes the electromagnetic block 201 out of the sliding cavity 2 and stretches the elastic airbag 4. At the same time, when the elastic airbag 4 is stretched, it can absorb external gas through the conduit 1 401 to restore it to its expanded state. Both the conduit 1 401 and the conduit 2 402 are provided with a one-way valve.

[0040] In summary, by combining the two methods of moving and spraying air into the gap, it is possible to better move the metal object from a tightly stuck state to a loose state. Therefore, when the electromagnetic block 201 cleans the metal object in the gap, the cleaning effect can be significantly improved.

[0041] Example 2:

[0042] Reference Figure 1 、 Figure 2 、 Figure 4 、 Figure 5A highway obstacle-clearing robot is substantially the same as that of Example 1, but further includes a bulldozer 1, two support frames 101 rotatably connected to the ends of the bulldozer 1, and both ends of the bulldozer 1 are rotatably connected to hydraulic telescopic rods 103, and the support frames 101 are rotatably connected to the telescopic ends of the hydraulic telescopic rods 103;

[0043] When clearing obstacles on the road, the push shovel 1 can be used to clear large obstacles on the road, and at the same time, metal objects adsorbed on the magnetic surface of the electromagnetic block 201 can be collected;

[0044] When large obstacles on the road need to be cleared, the support frame 101 can be pushed by the hydraulic telescopic rod 103 to raise the roller 102 located in front of the dozer blade 1 so that the dozer blade 1 can clear the large obstacles on the road.

[0045] The outer wall of the roller 102 is located between two adjacent electromagnetic blocks 201 and is fixed with multiple groups of brushes 3. Each group of brushes 3 is provided with multiple brushes. The brushes 3 are used in conjunction with the dozer 1.

[0046] When clearing obstacles on the road, the brush 3 rotating along with the roller 102 can clean small non-metallic objects on the road. At the same time, the brush 3 is used in conjunction with the shovel 1 to clean non-metallic objects, thereby improving the practicality of the obstacle removal robot.

[0047] At the same time, air is ejected into the gap through the air jet hole 404, thereby blowing away dust and debris around the non-metallic object, thereby helping to loosen the non-metallic object. At the same time, when the gas is ejected, the airflow exerts an impact force on the non-metallic object, enabling it to overcome the friction between it and the gap and other possible resistance, thereby blowing it out of the gap, so that the brush 3 cooperates with the push shovel 1 to clean the non-metallic object stuck in the gap but exposed on the road surface;

[0048] In specific implementation, in order to ensure that the gas ejected from the jet hole 404 exerts an impact force on the non-metallic object, can overcome the friction between it and the gap and other possible resistance, and thus blow it out of the gap, an external booster pump can be connected to supply air to the hollow cavity 403 connected to the jet hole 404.

[0049] It should be noted that, since the electromagnetic block 201 can be retracted into the sliding cavity 2 and its final state after retraction into the sliding cavity 2 is flush with the end of the brush 3 away from the roller 102 , the electromagnetic block 201 will not interfere with the use of the brush 3 .

[0050] Example 3:

[0051] Reference Figure 1 、 Figure 2、 Figure 5 、 Figure 7 A highway obstacle-clearing robot is substantially the same as that of Example 1, except that a second hollow cavity 501 is defined within the electromagnetic block 201, and a plurality of air jets 502 connected to the second hollow cavity 501 are fixedly mounted on one side of the electromagnetic block 201. The air jets 502 are arranged at an angle, and a branch pipe 5 is provided on the electromagnetic block 201, which is connected to the second hollow cavity 501 and the first hollow cavity 403, respectively.

[0052] When clearing obstacles on the road, the electromagnetic block 201 follows the roller 102 and rotates to the side facing the dozer 1 (such as Figure 5 As shown in Figure a), the electromagnetic block 201 is turned off. At this time, the metal objects adsorbed on the magnetic surface of the electromagnetic block 201 can fall into the push shovel 1, so that they can be cleaned centrally later. At the same time, the magnetic attraction performance of the magnetic surface of the electromagnetic block 201 can be ensured, preventing the magnetic surface of the electromagnetic block 201 from adsorbing too many metal objects and reducing the magnetic attraction performance of the magnetic surface of the electromagnetic block 201, thereby improving the cleaning effect of the electromagnetic block 201 on metal objects;

[0053] At the same time, if Figure 5 As shown, the three electromagnetic blocks 201 are a, b, and c, and the roller 102 rotates clockwise. a contacts the ground first, then b contacts the ground, and finally c contacts the ground. When b contacts the ground, the elastic airbag 4 at b will be compressed, and air will not only be supplied to the hollow cavity 1 403 connected to it through the second conduit 402, but also to the hollow cavity 2 501 at a through the hollow cavity 1 403 and the branch pipe 5. The gas is ejected from the air nozzle 502, and a one-way valve is provided on the branch pipe 5. At this time, a has already contacted the ground, and the magnetic force has attracted the metal object. At the same time, the electromagnetic block at a is powered off and closed, the magnetic force disappears, and the metal object falls downward. The air nozzle 502 blows out airflow, exerting wind force on the metal object in the direction of the dozer 1, blowing the metal object into the dozer 1 better.

[0054] When c contacts the ground, the air nozzle 502 at b blows out air to blow the metal object adsorbed by b.

[0055] It should be noted that the branch pipe 5 is a stretchable and contractible hose, so the branch pipe 5 will not interfere with the movement of the electromagnetic block 201.

[0056] Example 4:

[0057] Reference Figure 3 、 Figure 5 、 Figure 6, a roadblock clearing robot for highways, which is basically the same as Example 1, further includes a conductive block 1 204 and a conductive block 205 arranged in the sliding cavity 2 to control the switch of the electromagnetic block 201, the conductive block 1 204 is slidably connected in the sliding cavity 2, and the conductive block 205 is embedded in the electromagnetic block 201.

[0058] It also includes two multi-stage telescopic rods 203, which are symmetrically fixedly connected to the inner wall of the sliding cavity 2. The telescopic ends of the multi-stage telescopic rods 203 are fixedly connected to the conductive block 1 204. A spring 206 is sleeved on the multi-stage telescopic rod 203. One end of the spring 206 is fixedly connected to the conductive block 1 204, and the other end is fixedly connected to the inner wall of the sliding cavity 2.

[0059] Method for controlling the switch of electromagnetic block 201:

[0060] When the electromagnetic block 201 contacts the road surface and retracts into the sliding cavity 2, the conductive block 205 moves synchronously with the electromagnetic block 201. When the conductive block 205 moves the first preset distance and contacts the conductive block 1 204, the electromagnetic block 201 is turned on to generate a magnetic attraction, thereby adsorbing and cleaning metal objects on the road surface. At the same time, the conductive block 205 will continue to push the conductive block 1 204 to move the second preset distance and compress the spring 206 and the multi-stage telescopic rod 203. Then, when the electromagnetic block 201 separates from the road surface and loses the reverse thrust of the ground, the electromagnetic block 201 will extend out of the sliding cavity 2 under the push of the spring 1 202, and at the same time, the compressed spring 206 and the multi-stage telescopic rod 2 03 will push the conductive block 1 204, so that the conductive block 1 204 continues to contact and resist the conductive block 2 205, so that the electromagnetic block 201 still maintains the magnetic attraction until the conductive block 1 204 resets and moves to the second preset distance with the conductive block 2 205, and then the conductive block 1 204 stops moving, and the conductive block 2 205 continues to reset and move the first preset distance to return to its original position. The conductive block 1 204 and the conductive block 2 205 no longer contact and resist each other, and the electromagnetic block 201 loses its magnetic attraction. At this time, the metal object falls downward. During the reset and movement process of the conductive block 1 204 and the conductive block 2 205, the air nozzle 502 always blows air, exerting wind force on the metal object in the direction of the dozer 1, blowing the metal object into the dozer 1 better.

[0061] Example 5:

[0062] Reference Figure 5 , a highway obstacle-clearing robot, which is substantially the same as that of embodiment 1, and furthermore, an anti-slip groove 207 is provided on one side of the electromagnetic block 201;

[0063] When cleaning metal and non-metal objects on the road, when the electromagnetic block 201 approaches a metal or non-metal object stuck in a gap but exposed on the road, the anti-slip groove 207 increases the friction coefficient between one side of the electromagnetic block 201 and the contact point or surface of the object, thereby further helping the electromagnetic block 201 to move the object to loosen it, thereby helping to clean the metal and non-metal objects stuck in the gap.

[0064] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention.

Claims

1. A highway obstacle-clearing robot, comprising two symmetrically arranged support frames (101), characterized in that: Also includes: Rotating the roller (102) connected between the two support frames (101), A plurality of sliding cavities (2) are equidistantly provided on the circumference of the roller shaft (102), an electromagnetic block (201) is slidably connected in each sliding cavity (2), and one end of the electromagnetic block (201) located outside the sliding cavity (2) is a magnetic attraction surface; Two elastic air bags (4) are symmetrically arranged in the sliding cavity (2). The elastic airbag (4) is fixedly connected to the electromagnetic block (201) at one end and fixedly connected to the inner wall of the sliding cavity (2) at the other end. A hollow cavity (403) is provided between two adjacent electromagnetic blocks (201) in the roller shaft (102). An air injection hole (404) communicating with the hollow cavity (403) is provided on the roller shaft (102). A conduit (401) communicating with the elastic airbag (4) is provided on the roller shaft (102). A conduit (402) is provided in the roller shaft (102). One end of the conduit (402) is communicated with the elastic airbag (4) and the other end is communicated with the hollow cavity (403). The roller shaft (102) further comprises two springs (202). ), two springs (202) are symmetrically arranged in the sliding cavity (2), one end of the spring (202) is fixedly connected to the inner wall of the sliding cavity (2), and the other end is fixedly connected to the electromagnetic block (201), and also includes a conductive block (204) and a conductive block (205) arranged in the sliding cavity (2) to control the switch of the electromagnetic block (201), the conductive block (204) is slidably connected in the sliding cavity (2), and the conductive block (205) is embedded in the electromagnetic block (201), and also includes two multi-stage telescopic rods (203), the two multi-stage telescopic rods (203) are symmetrically fixedly connected to the inner wall of the sliding cavity (2), and the multi-stage telescopic rods (203) The telescopic end is fixedly connected to the conductive block 1 (204), the multi-stage telescopic rod (203) is sleeved with a spring 2 (206), one end of the spring 2 (206) is fixedly connected to the conductive block 1 (204), and the other end is fixedly connected to the inner wall of the sliding cavity (2), the support frame (101) is fixedly mounted with a motor (104), the roller (102) is fixedly connected to the output end of the motor (104), and also includes a push shovel (1), the two support frames (101) are respectively rotatably connected to the two ends of the push shovel (1), and the two ends of the push shovel (1) are rotatably connected to the hydraulic telescopic rod (103), and the support frame (101) and the telescopic end of the hydraulic telescopic rod (103) are rotatably connected. The outer wall of the roller shaft (102) is located between two adjacent electromagnetic blocks (201) and is fixedly installed with a plurality of brushes (3). Each group of the brushes (3) is provided with a plurality of brushes. The brushes (3) are used in conjunction with the push shovel (1). A second hollow cavity (501) is provided in the electromagnetic block (201). A plurality of air jets (502) connected to the second hollow cavity (501) are fixedly installed on one side of the electromagnetic block (201). The air jets (502) are arranged in an inclined manner. A branch pipe (5) connected to the second hollow cavity (501) and the first hollow cavity (403) is provided on the electromagnetic block (201). An anti-slip groove (207) is provided on one side of the electromagnetic block (201).

2. A method for operating an obstacle-clearing robot, comprising: using the obstacle-clearing robot for a highway according to claim 1, characterized in that: The following steps are included: Step 1: When cleaning metal objects on the road surface, the electromagnetic block (201) on the roller (102) is brought close to the ground, and then the electromagnetic block (201) is turned on. The magnetic surface of the electromagnetic block (201) generates a magnetic field, which enables the electromagnetic block (201) to absorb and clean the metal objects on the road surface; Step 2: During cleaning, the electromagnetic block (201) is driven to rotate synchronously by the rolling roller (102), and when the electromagnetic block (201) contacts the metal object stuck in the gap but exposed on the road surface, it is able to move the metal object to loosen it; Step 3: When the rotating electromagnetic block (201) contacts the road surface, the electromagnetic block (201) retracts into the sliding cavity (2) and compresses the elastic airbag (4), so that the gas is transported into the air injection hole (404) through the second conduit (402) and sprayed toward the gap, so that dust and debris around the metal object are blown away, and the metal object is loosened; Step 4: After the metal objects on the road are cleaned, the electromagnetic block (201) is turned off to make the electromagnetic block (201) lose its magnetic attraction, and then the metal objects dropped from the electromagnetic block (201) can be cleaned.

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