Abstract:
An automatic machine for cleaning wallboards, such as the wallboards of wall, glass or solar panels. Pluralities of long axial tracks are arranged parallel in an array. Water guide pipes and electric rails are formed on the long axial tracks. The walls of the water guide pipes are provided with a plurality of magnetic valves at intervals. Sliding engine bases are arranged on the long axial tracks. The sliding engine bases are provided with conduction frames corresponding to the electric rails and a long axial magnet body which can open and close cleaning water by magnetic force relative to the magnetic valves. At least two brush supporting bases are provided movably on the corresponding sliding engine bases to close to or leave away from the sliding engine bases by a power extending object. A long axial brush is provided between two nearby brush supporting bases of the sliding engine bases. The setting direction of the long axial brush is vertical to that of the long axial tracks. The long axial brush is driven by a shaking device to brush and wash the wallboards. Protective cover plates are arranged at the outer side of the long axial brush.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to an automatic machine that is adapted for cleaning wallboards. 
       BACKGROUND OF THE INVENTION 
       [0002]    The cleanness of a building&#39;s exterior walls can have great influences on people&#39;s impression of the building as well as the city&#39;s appearance. In particular, since a building with glass curtain walls can be seen-through, whether the glass curtain walls are clean or not is very important. A conventional way that is adapted to clean the exterior walls or outer surfaces of glass windows of the building is hanging a suspended scaffold down from a top of the building to allow workers on the suspended scaffold to clean the exterior walls or the glass windows manually. However, cleaning the exterior walls or the glass windows manually not only consumes manpower and is difficult, but is also very dangerous to the workers on the suspended scaffold. 
       SUMMARY OF THE INVENTION 
       [0003]    The main objective of the present invention is to provide an automatic machine for cleaning wallboards that saves manpower when cleaning the wallboards. 
         [0004]    The automatic machine for cleaning the wallboards has: 
         [0005]    two long axial tracks being separated and being parallel to each other; 
         [0006]    at least two sliding engine bases respectively mounted slidably on the long axial tracks, and each sliding engine base driven by a main driving device to slide along a corresponding long axial track; 
         [0007]    at least two brush supporting bases respectively mounted movably on the at least two sliding engine bases, and each brush supporting base driven by a power extending object and selectively moving toward or away from a corresponding sliding engine base; and 
         [0008]    at least one long axial brush rotatably mounted around at least one elongated rod and being perpendicular to the long axial tracks, and each of the at least one long axial brush mounted between and sliding along with two of the at least two brush supporting bases that are disposed next to each other and having 
         [0009]    an elongated tube having multiple bristles; and 
         [0010]    at least one vibrator mounted in the long axial brush. 
         [0011]    In the above-mentioned automatic machine for cleaning wallboards, the at least one long axial brush and the at least one elongated rod freely rotate relative to each other. 
         [0012]    In the above-mentioned automatic machine for cleaning wallboards, at least two springs are mounted around the at least one elongated rod and are respectively disposed beside ends of the at least one long axial brush. 
         [0013]    In the above-mentioned automatic machine for cleaning wallboards, the at least two brush supporting bases are pivotally mounted on the at least two sliding engine bases and are respectively connected to the power extending objects, and each of the power extending objects has a distal end connected to a corresponding sliding engine base. When the power extending objects selectively retract, the at least two brush supporting bases pivot forward and backward relative to the at least two sliding engine bases. 
         [0014]    The above-mentioned automatic machine for cleaning wallboards further has at least one protective cover plate mounted around the at least one long axial brush. Each of the at least one protective cover plate has a partition disposed in the protective cover plate and having multiple through holes separately formed through the partition, and a vent channel defined between an outer wall of the protective cover plate and the partition. 
         [0015]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has a mounting recess and is securely attached to the wallboard with at least one T-nut fitted in the mounting recess and attached to the wallboard. 
         [0016]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has multiple recessed tracks, and each of the sliding engine bases has multiple wheels slidably mounted in the recessed tracks of the corresponding long axial track. 
         [0017]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has an electric rail, and each of the sliding engine bases has a conduction frame corresponding to and electrically connected to the electric rail of the corresponding long axial track. 
         [0018]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has an elongated water guide pipe and an elongated magnet guiding recess disposed beside and extending parallel to the water guide pipe. Multiple magnetic valves are mounted through an inner wall of each long axial track and correspond to the water guide pipe of each long axial track. A long axial magnet body is mounted in the magnet guiding recess of each long axial track, slides simultaneously along with the corresponding sliding engine base and controls the magnetic valves that are mounted on the long axial track. 
         [0019]    In the above-mentioned automatic machine for cleaning wallboards, each magnetic valve has a valve tube, a magnet, a spring, a waterproof gasket and a magnetic plate. The valve tube has a tubular inner space having a closed end and an open end, multiple grooves axially formed in an inner sidewall defined around the tubular inner space, and multiple through holes radially formed through the valve tube and respectively corresponding to and communicating with the grooves. The magnet is mounted in the tubular inner space of the valve tube. The spring is mounted around the magnet and is disposed in the tubular inner space of the valve tube. The waterproof gasket and the magnetic plate are mounted on the open end of the tubular inner space of the valve tube in sequence. The waterproof gasket has a through hole. The magnetic plate has a through hole. The spring constantly pushes the magnet toward the waterproof gasket, such that the magnet resiliently abuts the waterproof gasket and selectively seals the through hole of the waterproof gasket. 
         [0020]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has an elongated rack, and the main driving device of each of the sliding engine bases has a driving rod and a driving gear securely mounted on the driving rod and engaging the elongated rack of the corresponding long axial track. 
         [0021]    In the above-mentioned automatic machine for cleaning wallboards, two auxiliary driving devices are respectively disposed beside two ends of each long axial track, and each auxiliary driving device has a roller and a pulling element connected to the roller and the sliding engine base that corresponds to the long axial track. 
         [0022]    In the above-mentioned automatic machine for cleaning wallboards, two pivot shafts are rotatably disposed respectively beside the two ends of each long axial track and are perpendicular to the long axial track. The rollers are respectively mounted on the pivot shafts. The pulling element of each auxiliary driving device is connected to the roller and the sliding engine base that corresponds to the long axial track. Each pivot shaft is driven by one auxiliary driving device. 
         [0023]    The automatic machine for cleaning wallboards has: 
         [0024]    at least two long axial tracks being separated and being parallel to each other; 
         [0025]    at least two sliding engine bases respectively mounted slidably on the at least two long axial tracks, and each sliding engine base driven by a main driving device to slide along a corresponding long axial track; 
         [0026]    at least one bracket protective cover plate, and each of the at least one bracket protective cover plate mounted on and between each two of the sliding engine bases that are disposed next to each other, being perpendicular to the at least two long axial tracks and having an elongated sliding track longitudinally mounted on the bracket protective cover plate; 
         [0027]    at least one sliding brush base, and each of the at least one sliding brush base is driven by a driving apparatus and has a slide disposed on an inner surface of the sliding brush base and slidably mounted on the elongated sliding track of a corresponding bracket protective cover plate; and 
         [0028]    at least one brush bracket, each of the at least one brush bracket is slidably mounted on a corresponding sliding brush base and selectively slides forward and backward relative to the corresponding sliding brush base. 
         [0029]    In the above-mentioned automatic machine for cleaning wallboards, each of the at least one brush bracket has a vibrator mounted on the brush bracket. 
         [0030]    In the above-mentioned automatic machine for cleaning wallboards, each of the at least one bracket protective cover plate has a partition disposed in the bracket protective cover plate and having multiple through holes separately formed through the partition, and a vent channel defined between an outer wall of the bracket protective cover plate and the partition. 
         [0031]    In the above-mentioned automatic machine for cleaning wallboards, each of the at least two long axial tracks has an elongated water guide pipe. Each of the at least one bracket protective cover plate has a water collecting receptacle disposed lower than the elongated water guide pipe of the long axial track that corresponds to a top of the bracket protective cover plate, and a water storage receptacle communicating with the water collecting receptacle. 
         [0032]    In the above-mentioned automatic machine for cleaning wallboards, each of the at least two long axial tracks has a mounting recess and is securely attached to the wallboards with at least one T-nut fitted in the mounting recess and attached to the wallboard. 
         [0033]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has multiple recessed tracks, and each of the sliding engine bases has multiple wheels slidably mounted in the recessed tracks of the corresponding long axial track. 
         [0034]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has an electric rail, and each of the sliding engine bases has a conduction frame corresponding to and electrically connected to the electric rail of the corresponding long axial track. 
         [0035]    In the above-mentioned automatic machine for cleaning wallboards, each of the long axial tracks has an elongated water guide pipe and an elongated magnet guiding recess disposed beside and extending parallel to the water guide pipe. Multiple magnetic valves are mounted through an inner wall of each long axial track and correspond to the water guide pipe of each long axial track. A long axial magnet body is mounted in the magnet guiding recess of each long axial track, slides simultaneously along with the corresponding sliding engine base and controls the magnetic valves that are mounted on the long axial track. 
         [0036]    In the above-mentioned automatic machine for cleaning wallboards, each magnetic valve has a valve tube, a magnet, a spring, a waterproof gasket and a magnetic plate. The valve tube has a tubular inner space having a closed end and an open end, multiple grooves axially formed in an inner sidewall defined around the tubular inner space, and multiple through holes radially formed through the valve tube and respectively corresponding to and communicating with the grooves. The magnet is mounted in the tubular inner space of the valve tube. The spring is mounted around the magnet and is disposed in the tubular inner space of the valve tube. The waterproof gasket and the magnetic plate are mounted on the open end of the tubular inner space of the valve tube in sequence. The waterproof gasket has a through hole. The magnetic plate has a through hole. The spring constantly pushes the magnet toward the waterproof gasket, such that the magnet resiliently abuts the waterproof gasket and selectively seals the through hole of the waterproof gasket. 
         [0037]    In the above-mentioned automatic machine for wallboards, each of the long axial tracks has an elongated rack, and the main driving device of each of the sliding engine bases has a driving rod and a driving gear securely mounted on the driving rod and engages the elongated rack of the corresponding long axial track. 
         [0038]    In the above-mentioned automatic machine for cleaning wallboards, two auxiliary driving devices are respectively disposed beside two ends of each long axial track, and each auxiliary driving device has a roller and a pulling element connected to the roller and the sliding engine base that corresponds to the long axial track. 
         [0039]    In the above-mentioned automatic machine for cleaning wallboards, two pivot shafts are rotatably disposed respectively beside the two ends of each long axial track and are perpendicular to the long axial track. The rollers are respectively mounted on the pivot shafts. The pulling element of each auxiliary driving device is connected to the roller and the sliding engine base that corresponds to the long axial track. Each pivot shaft is driven by one auxiliary driving device. 
         [0040]    The automatic machine for cleaning wallboards in accordance with the present invention has the following advantages. The long axial tracks may be made of materials with antioxidant properties and are orderly mounted on the wallboards. When the automatic machine is not in operation, the brush brackets are put aside of the building and the power extending objects retract the brush brackets. Thus, the brushes of the brush brackets are moved off the wallboards and will not be easily deformed. The bracket protective cover plate protects the brush brackets and beautifies appearance of the automatic machine. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0041]      FIG. 1  is a perspective view of a first embodiment of an automatic machine for cleaning wallboards in accordance with the present invention, showing a protective cover plate being omitted; 
           [0042]      FIG. 2  is an enlarged exploded perspective view of the automatic machine in  FIG. 1 ; 
           [0043]      FIG. 3  is an exploded perspective view of a magnetic valve of the automatic machine in  FIG. 1 ; 
           [0044]      FIG. 4  is an end view of an long axial track of the automatic machine in  FIG. 1 ; 
           [0045]      FIG. 5  is an enlarged side view of the automatic machine in  FIG. 1 ; 
           [0046]      FIG. 6  is an enlarged perspective view of the automatic machine in  FIG. 1 , showing a roller pulling a pulling element; 
           [0047]      FIG. 7  is a perspective view of a second embodiment of an automatic machine for wallboards in accordance with the present invention; 
           [0048]      FIG. 8  is an enlarged exploded perspective view of the automatic machine in  FIG. 7 ; and 
           [0049]      FIG. 9  is an enlarged side view in partial section of the automatic machine in  FIG. 7 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0050]    The following descriptions of the preferred embodiments of the present invention are accompanied with the aforementioned attached drawings to explain the techniques for achieving the objective of the present invention. 
         [0051]    With reference to  FIGS. 1 and 2 , a first preferred embodiment of an automatic machine for cleaning wallboards in accordance with the present invention is adapted for cleaning the wallboards  90  having protrusions and has at least two sliding engine bases  20 , at least two brush supporting bases  50 A respectively mounted on the at least two sliding engine bases  20 , at least one elongated rod  24 A and at least one long axial brush  40 A rotatably mounted around the at least one elongated rod  24 A. Each of the at least one elongated rod  24 A is mounted between two of the at least two brush supporting bases  50 A that are disposed next to each other. Each of the at least one long axial brush  40 A has at least one vibrator  42 A. The at least one vibrator  42 A vibrates the long axial brush  40 A so that the long axial brush  40 A cleans the wallboards  90 . When the automatic machine is cleaning the wallboards  90 , the at least one long axial brush  40 A abuts the wallboards  90  and freely rotates. When the at least one long axial brush  40 A encounters the protrusions, the at least one long axial brush  40 A rolls across the protrusions such that the protrusions of the wallboards  90  are easily cleaned. 
         [0052]    A specific structure of the first preferred embodiment of the automatic machine for cleaning wallboards in accordance with the present invention comprises multiple magnetic valves  30 , at least two long axial tracks  10 , at least two sliding engine bases  20 , at least two brush supporting bases  50 A, at least one long axial brush  40 A and at least one protective cover plate  60 A. 
         [0053]    With further reference to  FIG. 3 , each magnetic valve  30  has a valve tube  31 , a magnet  32 , a spring  33 , a waterproof gasket  34  and a magnetic plate  35 . The valve tube  31  has a tubular inner space  311 , multiple grooves  312  and multiple through holes  313 . The tubular inner space  311  has a closed end, an open end and two different inner diameters. One inner diameter of the tubular inner space  311  is defined at the open end of the tubular inner space  311  and is longer than the other inner diameter of the tubular inner space  311  defined at the closed end of the tubular inner space  311 . The grooves  312  are axially formed in an inner sidewall defined around the tubular inner space  311 . The through holes  313  of the valve tube  31  are radially formed through the valve tube  31  and respectively correspond to and communicate with the grooves  312 . The magnet  32  undergoes an anti-rust treatment and a hardening treatment, is mounted in the tubular inner space  311  of the valve tube  31  and has two rod portions. The two rod portions have different outer diameters being respectively equal to the two different inner diameters of the tubular inner space  311 . The spring  33  is mounted around the rod portion with a shorter outer diameter, is disposed in the tubular inner space  311  at the closed end with a longer inner diameter, and has an inner diameter and two ends. The inner diameter of the spring  33  is equal to the shorter outer diameter of the rod portion. The ends of the spring  33  respectively abut the inner sidewall of the valve tube  31  and the magnet  32 . The waterproof gasket  34  and the magnetic plate  35  are mounted on the open end of the tubular inner space  311  of the valve tube  31  in sequence and are securely attached to the valve tube  31  via screws  36 . The waterproof gasket  34  has a through hole  341  formed through a center of the waterproof gasket  34 . The magnetic plate  35  has a through hole  351  formed through a center of the magnetic plate  35 . The spring  33  constantly pushes the magnet  32  toward the waterproof gasket  34 , such that the magnet  32  resiliently abuts the waterproof gasket  34  and selectively seals the through hole  341  of the waterproof gasket  34 . 
         [0054]    With reference to  FIGS. 2 and 4 , each long axial track  10  may be made by an aluminum extrusion process, is substantially rectangular and has multiple axial channels, multiple axial recesses, a long axial magnet body  151 , an electric rail  141  and an elongated rack  171 . One of the axial channels is defined as a water guide pipe  11 . Three of the axial recesses are defined as three recessed tracks  12 . The three recessed tracks  12  are respectively formed in three elongated outer surfaces of the long axial track  10 . Moreover, the others of the axial recesses are respectively defined as a mounting recess  13 , a conductive track recess  14 , a magnet guiding recess  15 , a magnetic valve recess  16  and a rack recess  17 . The magnet guiding recess  15  is disposed beside and extends parallel to the water guide pipe  11 . The magnetic valve recess  16  has an inner wall and multiple mounting holes  161 . The inner wall of the magnetic valve recess  16  is defined between the magnetic valve recess  16  and the water guide pipe  11 . The mounting holes  161  of the magnetic valve recess  16  are separately formed through the inner wall of the magnetic valve recess  16 . The magnetic valves  30  are respectively mounted through the mounting holes  161  of the magnetic valve recess  16 . The valve tube  31  of each magnetic valve  30  has multiple fastening holes  314  and is securely attached to a sidewall defined around the magnetic valve recess  16  via multiple screws mounted through the fastening holes  314  of the valve tube  31  and fastened to the sidewall of the magnetic valve recess  16 . The long axial magnet body  151  is mounted in the magnet guiding recess  15 . The electric rail  141  is mounted in the conductive track recess  14  and has an end electrically connected to a power source. The elongated rack  171  is mounted in the rack recess  17  and has a bottom, a top and multiple teeth. A size of the bottom of the elongated rack  171  corresponds to a size of the rack recess  17 . The teeth of the elongated rack  171  are formed on the top of the elongated rack  171  and protrude out of the rack recess  17 . 
         [0055]    The at least two sliding engine bases  20  are slidably mounted on the at least two long axial tracks  10 . Each sliding engine base  20  has a sliding bracket  21 , multiple wheels  22  and a main driving device  23 . The sliding bracket  21  corresponds to dimensions of a corresponding long axial track  10 , is mounted around the corresponding long axial track  10  and has two ends, multiple mounting holes  211 , a conduction frame  213 , two mounting wings  214 , a mounting seat  215  and a gear hole  216 . The mounting holes  211  of the sliding bracket  21  are separately formed through the sliding bracket  21 , are disposed at the ends of the sliding bracket  21  and correspond to the recessed tracks  12  of the corresponding long axial track  10 . The conduction frame  213  is mounted on an inner wall of the sliding bracket  21 , and corresponds to and is electrically connected to the electric rail  141 . The mounting wings  214  are respectively formed on the ends of the sliding bracket  21 , and correspond to and are mounted in the magnet guiding recess  15 . Each mounting wing  214  has a pivot hole  2141 . The long axial magnet body  151  of the corresponding long axial track  10  is disposed between the mounting wings  214 . The mounting seat  215  is formed on an outer wall of the sliding bracket  21 . The gear hole  216  is formed through the sliding bracket  21  and corresponds to the elongated rack  171 . The wheels  22  are mounted in the recessed tracks  12  of the corresponding long axial track  10  and are rotatably connected to the sliding bracket  21  via multiple screws  212 . The main driving device  23  is mounted on the mounting seat  215  and has a driving rod and a driving gear  231 . The driving rod is rotatably mounted through the mounting seat  215 . The driving gear  231  is securely mounted on the driving rod, is mounted in the gear hole  216  and engages the elongated rack  171  of the corresponding long axial track  10 . Thus, the sliding bracket  21  connecting with the wheels  22  is slidably mounted on the corresponding long axial track  10 . The conduction frame  213  that is electrically connected to the electric rail  141  provides electric power to the main driving device  23  to allow the main driving device  23  to drive the sliding engine base  20  to slide along the corresponding long axial track  10 . 
         [0056]    The at least two brush supporting bases  50 A are respectively mounted on the at least two sliding engine bases  20 . Each of the at least two brush supporting bases  50 A has a mounting tube  51 A, two pairs of ears, a driven rod  513 A, a pivot base  52 A, a pivot rod  53 A and a power extending object  54 A. The mounting tube  51 A has an axial hole  511 A axially formed through the mounting tube  51 A. The two pairs of ears oppositely protrude radially from an outer surface of the mounting tube  51 A. The ears of each pair are respectively disposed adjacent to two ends of the mounting tube  51 A. Each ear of one of the two pairs has a pivot hole  512 A formed through the ear and disposed adjacent to a distal end of the ear. The driven rod  513 A is rotatably mounted between the ears of the other pair of ears and has a connecting hole  5131 A. The pivot base  52 A is securely mounted on the sliding bracket  21  via screws and has a pivot hole  521 A axially formed through the pivot base  52 A. The pivot rod  53 A is pivotally mounted through the pivot holes  512 A of the ears and the pivot hole  521 A of the pivot base  52 A. The power extending object  54 A is pivotally mounted on the sliding bracket  21  and has a distal end mounted in the connecting hole  5131 A of the driven rod  513 A and connected to the driven rod  513 A. 
         [0057]    Each of the at least one long axial brush  40 A is mounted between two of the at least two brush supporting bases  50 A that are disposed next to each other, and has an elongated tube  41 A, at least one vibrator  42 A and at least two bearings  43 A. The elongated tube  41 A has multiple bristles  411 A, an axial hole and at least one vibrator recess  412 A. The bristles  411 A are mounted on an outer surface of the elongated tube  41 A. The axial hole of the elongated tube  41 A is axially formed through the elongated tube  41 A. The at least one vibrator recess  412 A is formed in an inner surface of the elongated tube  41 A. The at least one vibrator  42 A is mounted in the at least one vibrator recess  412 A of the elongated tube  41 A. As shown in the drawings, the elongated tube  41 A has one vibrator recess  412 A for mounting one vibrator  42 A. Each of the at least one vibrator  42 A has an axial hole  421 A axially formed through the vibrator  42 A and being coaxial with the axial hole of the elongated tube  41 A. The at least two bearings  43 A are securely mounted around the at least one vibrator  42 A. Each two of the at least two bearings  43 A are disposed at two ends of a corresponding vibrator  42 A. Thus, the at least one vibrator  42 A is rotatably mounted in the at least one vibrator recess  412 A. 
         [0058]    The at least one protective cover plate  60 A is U-shaped and elongated, is mounted around the at least one long axial brush  40 A, baffles cleaning water and protects the at least one long axial brush  40 A. Each of the at least one protective cover plate  60 A has two ends, a partition  61 A and a vent channel  62 A. The ends of the protective cover plate  60 A are respectively connected securely to the sliding brackets  21  of two of the at least two sliding engine bases  20  that are disposed next to each other. The partition  61 A is axially disposed in the protective cover plate  60 A and has multiple through holes  611 A separately formed through the partition  61 A. The vent channel  62 A is defined between an outer wall of the protective cover plate  60 A and the partition  61 A. 
         [0059]    With reference to  FIGS. 1 ,  2  and  5 , the first preferred embodiment of the automatic machine for cleaning wallboards in accordance with the present invention is mounted on the wallboards  90  of a building. Multiple long axial tracks  10  of the automatic machine are parallelly mounted on the wallboard  90 . Each long axial track  10  is securely attached to the wallboard  90  with T-nuts  131 , fasteners  133  and bolts  132  fitted in the mounting recess  13  and attached to the wallboard  90 . Multiple water supply pipes respectively communicate with the water guide pipes  11  of the long axial tracks  10  and supply water from pumps or tap water pipeline to the long axial tracks  10 . At least one sliding engine base  20  is mounted on each long axial track  10 . As shown in the drawings, three long axial tracks  10  are parallelly mounted on the wallboard  90 . One sliding engine base  20  is mounted on each long axial track  10 . One brush supporting base  50 A is mounted on each sliding engine base  20 . One long axial brush  40 A is mounted between each two of the brush supporting bases  50 A that are disposed next to each other. The way to assemble the brush supporting bases  50 A and the long axial brush  40 A is as follows. The long axial brushes  40 A are coaxial with the axial holes  421 A of the vibrators  42 A and the axial holes  511 A of the mounting tubes  51 A of the brush supporting bases  50 A. One elongated rod  24 A that may be a cable, a round steel rod, a tube or the like, is mounted through the axial holes  511 A of the mounting tubes  51 A of the brush supporting bases  50 A and the axial holes  421 A of the vibrators  42 A. Multiple springs  44 A are mounted around the elongated rod  24 A and are respectively disposed beside ends of the long axial brushes  40 A. The elongated rod  24 A is strained and is connected to the brush supporting bases  50 A. Thus, the long axial brushes  40 A are linearly arranged and are perpendicular to the long axial tracks  10 . Then, multiple protective cover plates  60 A are respectively mounted around the long axial brushes  40 A and are respectively attached securely to the sliding engine bases  20 . The vent channel  62 A of each protective cover plate  60 A is connected to a blower  63 A. The blower  63 A may be mounted on one of the ends of the protective cover plate  60 A and has an outlet communicating with the vent channel  62 A. 
         [0060]    With further reference to  FIG. 6 , two auxiliary driving devices  71  are mounted on the wallboard  90  and are respectively disposed beside two ends of each of the at least one long axial track  10 . Each auxiliary driving device  71  has a pivot shaft  74 , at least one roller  711  and at least one pulling element  72 . The at least one roller  711  is securely mounted on the pivot shaft  74 . The at least one pulling element  72  is mounted around the at least one long axial track  10 . Each of the at least one pulling element  72  is further mounted around the rollers  711  of the two auxiliary driving devices  71  that are disposed beside the ends of a corresponding long axial track  10 , and has two ends. The ends of the pulling element  72  are connected to the mounting wings  214  of the sliding bracket  21  that is mounted on the corresponding long axial track  10 . Thus, the pulling element  72  selectively pulls the sliding bracket  21  to slide on the long axial track  10 . Specifically, as shown in the drawings, the pivot shafts  74  are mounted through bearing seats  73  mounted on the wallboard  90 , and are respectively disposed beside the two ends of each long axial track  10 . Each pivot shaft  74  is driven by one auxiliary driving device  71 . The rollers  711  that are mounted on each pivot shaft  74  respectively correspond to the long axial tracks  10 . Multiple pulling elements  72  are respectively mounted around the long axial tracks  10  and the rollers  711  on the pivot shafts  74 . The ends of each pulling element  72  are connected to the mounting wings  214  of a corresponding sliding bracket  21 . The above-mentioned pulling element  72  may be a chain, a belt or as shown in the drawings, a cable connected to the mounting wings  214  of the corresponding sliding bracket  21  and mounted around the rollers  711  that are disposed beside the ends of the corresponding long axial track  10 . As the rollers  711  alternately rotate, the sliding engine base  20  slides along the long axial track  10 . 
         [0061]    When the first preferred embodiment of the automatic machine for cleaning wallboards in accordance with the present invention is in operation, the cleaning water flows into the water guide pipes  11  of the long axial tracks  10 . The main driving devices  23  or the auxiliary driving devices  71  are switched on to drive all of the sliding engine bases  20  to simultaneously slide along the long axial tracks  10 . As the power extending object  54 A retracts, the bristles  411 A of the at least one long axial brush  40 A abut the wallboard  90 . The at least one vibrator  42 A vibrates, so the at least one long axial brush  40 A vibrates as well. Since the at least one long axial brush  40 A is rotatable, the at least one long axial brush  40 A rolls across the protrusions of the wallboard  90  with lowered resistance and easily cleans the wallboard  90 . The mounting wings  214  of the sliding brackets  21  simultaneously push the long axial magnet bodies  151  to slide along the magnet guiding recesses  15 . The long axial magnet bodies  151  and the magnets  32  of the magnetic valves  30  attract each other. Thus, when the sliding engine bases  20  slide by, the magnets  32  are attracted by the long axial magnet bodies  151  and loosen the waterproof gaskets  34  so the through holes  341  of the waterproof gaskets  34  are revealed. Consequently, the cleaning water in the water guide pipes  11  of the long axial tracks  10  is drained from the magnetic valves  30  and flows over the wallboard  90 . When the sliding engine bases  20  as well as the long axial magnet bodies  151  depart from the magnetic valves  30 , the springs  33  of the magnetic valves  30  push the magnets  32  and the magnetic plates  35  of the magnetic valves  30  attract the magnets  32 , so the magnets  32  seal the through holes  341  of the waterproof gaskets  34  to prevent the cleaning water in the water guide pipes  11  from being drained. Moreover, water drops left on the wallboard  90  is cleaned away with the sliding engine bases  20  sliding across and the bristles  411 A of the at least one long axial brush  40 A abutting the wallboards  90  such that the vibrators  42 A vibrate the at least one long axial brush  40 A. Additionally, after the wallboard  90  has been cleaned, the blower  63 A may be switched on to guide air with high pressure into the vent channel  62 A of the at least one protective cover plate  60 A. The air further flows through the through holes  611 A of the partition  61 A to dry the water drops. 
         [0062]    In the above-mentioned automatic machine, the long axial tracks  10  may be made of materials with antioxidant properties and are orderly mounted on the wallboard  90 . When the automatic machine is not in operation, the at least one long axial brush  40 A is put aside of the building and the power extending objects  54 A protrude and push the brush supporting bases  50 A. Thus, the bristles  411 A of the at least one long axial brush  41 A are moved off the wallboard  90  and will not be easily deformed. The at least one protective cover plate  60 A protects the at least one long axial brush  40 A and beautifies appearance of the automatic machine. 
         [0063]    With reference to  FIGS. 7 and 8 , a second preferred embodiment of an automatic machine for cleaning wallboards in accordance with the present invention is also mounted on the wallboards  90  of the building. Multiple long axial tracks  10  of the automatic machine are parellelly mounted on the wallboard  90 . At least one sliding engine base  20  is mounted on each long axial track  10 . Differences between the second preferred embodiment and the first preferred embodiment of the automatic machine are as follows. A bracket protective cover plate  60 B is mounted on and between each two of the sliding engine bases  20 B that are disposed on the long axial tracks  10  and next to each other. A sliding brush base  50 B is mounted on each bracket protective cover plate  60 B and is capable of axial sliding along the bracket protective cover plate  60 B. A brush bracket  40 B with brush  41 B is retractably mounted on each sliding brush base  50 B, selectively abuts the wallboard  90  and has a vibrator  42 B. Thus, the second preferred embodiment of the automatic machine may be numerically controlled to wash a partial of the wallboard  90  with the brushes  41 B of the brush brackets  40 B. For example, the second preferred embodiment of the automatic machine can selectively wash glass windows  91  of the wallboard  90 . 
         [0064]    A specific structure of the second preferred embodiment of the automatic machine for cleaning the wallboards in accordance with the present invention comprises multiple magnetic valves  30 , at least two long axial tracks  10 , at least two sliding engine bases  20 , at least one bracket protective cover plate  60 B, at least one brush bracket  40 B and at least two sliding brush bases  50 B. The magnetic valves  30 , the at least two long axial tracks  10  and the at least two sliding engine bases  20  of the second preferred embodiment of the automatic machine are the same as the magnetic valves  30 , the at least two long axial tracks  10  and the at least two sliding engine bases  20  of the first preferred embodiment of the automatic machine. 
         [0065]    With reference to  FIG. 8 , the at least one bracket protective cover plate  60 B is U-shaped and elongated. Each of the at least one bracket protective cover plate  60 B has a partition  61 B, an elongated vent channel  62 B, two elongated sliding tracks  64 B, a driving apparatus  65 B, a transmission roller  66 B, a guide roller  67 B, a water collecting receptacle  68 B and a water storage receptacle  69 B. The partition  61 B is disposed in the bracket protective cover plate  60 B and has multiple through holes  611 B formed through the partition  61 B. The vent channel  62 B is defined between an outer wall of the bracket protective cover plate  60 B and the partition  61 B. The elongated sliding tracks  64 B are respectively mounted longitudinally on two elongated edges of the bracket protective cover plate  60 B. Each elongated sliding track  64 B is attached to the bracket protective cover plate  60 B via screws  641 B. The driving apparatus  65 B is securely mounted on the partition  61 B and is disposed adjacent to a top of the partition  61 B. The transmission roller  66 B is mounted adjacent to the top of the partition  61 B and is connected to the driving apparatus  65 B. The guide roller  67 B is mounted adjacent to a bottom of the partition  61 B. The water collecting receptacle  68 B is mounted on a top of the bracket protective cover plate  60 B and is disposed lower than the long axial track  10  that corresponds to the top of the bracket protective cover plate  60 B and the sliding engine base  20  that is mounted on the long axial track  10 . The water storage receptacle  69 B is mounted on the top of the bracket protective cover plate  60 B, is disposed below the water collecting receptacle  68 B and communicates with the water collecting receptacle  68 B via a guiding tube. A pump (not shown) may be mounted on the water storage receptacle  69 B. 
         [0066]    Each of the at least one brush bracket  40 B is elongated and has a brush  41 B, multiple pivot seats  43 B and a vibrator  42 B. The brush  41 B is mounted on an outer surface of the brush bracket  40 B and is changeable. The pivot seats  43  are separately mounted on an inner surface of the brush bracket  40 B. As shown in the drawing, the brush bracket  40 B has two pairs of pivot seats  43  respectively disposed adjacent to a top and a bottom of the brush bracket  40 B. The vibrator  42 B is mounted on the brush bracket  40 B. 
         [0067]    Each of the at least two sliding brush bases  50 B is a rectangular frame, is capable of being received in the bracket protective cover plate  60 B, and has two slides  52 B, two fastening seats  51 B, a pulling element  53 B, multiple pivot seats  54 B, multiple connecting rods  55 B and a power extending object  44 B. The slides  52 B are disposed on an inner surface of the sliding brush base  50 B, respectively disposed adjacent to two opposite side edges of the sliding brush base  50 B and are respectively mounted slidably on the elongated sliding tracks  64 B of the bracket protective cover plate  60 B. The fastening seats  51 B are disposed on the inner surface of the sliding brush base  50 B and are respectively disposed adjacent to an upper edge and a lower edge of the sliding brush base  50 B. The pulling element  53 B may be a chain, a belt or a cable, is mounted around the transmission roller  66 B and the guide roller  67 B, and has two ends respectively connected to the fastening seats  51 B. The pivot seats  54 B of the sliding brush base  50 B are separately mounted on an outer surface of the sliding brush base  50 B and respectively correspond to the pivot seats  43 B of the brush bracket  40 B. Each connecting rod  55 B is connected to one of the pivot seats  54 B of the sliding brush base  50 B and one of the pivot seats  43 B of the brush bracket  40 B that correspond to each other. Thus, the brush bracket  40 B parallelly slides up and down relative to the sliding brush base  50 B. The power extending object  44 B is pivotally connected to the brush bracket  40 B and the sliding brush base  50 B and selectively drives the brush bracket  40 B to slide up and down, and forward and backward. 
         [0068]    With further reference to  FIGS. 7 and 9 , the second preferred embodiment of the automatic machine for cleaning wallboards in accordance with the present invention is mounted on the wallboards  90  of a building. Multiple long axial tracks  10  of the automatic machine are parallelly mounted on the wallboard  90 . Means of attaching the long axial tracks  10  of the second preferred embodiment are the same as in the first preferred embodiment of the automatic machine. Each long axial track  10  is securely attached to the wallboard  90  with T-nuts  131 , fasteners  133  and bolts  132  fitted in the mounting recess  13  and attached to the wallboard  90 . Multiple water supply pipes respectively communicate with the water guide pipes  11  of the long axial tracks  10  and supply water from pumps or tap water pipeline to the long axial tracks  10 . At least one sliding engine base  20  is mounted on each long axial track  10 . As shown in the drawings, three long axial tracks  10  are parallelly mounted on the wallboard  90 . One sliding engine base  20  is mounted on each long axial track  10 . One bracket protective cover plate  60 B is mounted between each two of the sliding engine bases  20  that are disposed next to each other and is screwed to the sliding brackets  21  of the sliding engine bases  20 . Thus, the bracket protective cover plates  60 B are linearly arranged and are perpendicular to the long axial tracks  10 . One sliding brush base  50 B and one brush bracket  40 B are mounted on each bracket protective cover plate  60 B. The vent channel  62 A of each protective cover plate  60 A is connected to a blower  63 A. The blower  63 A may be mounted on one of the ends of the protective cover plate  60 A and has an outlet communicating with the vent channel  62 A. 
         [0069]    The second preferred embodiment of the automatic machine is controlled by a controlling mechanism. Preferably, the controlling mechanism may be a programmed numerical control to selectively wash a partial of the wallboard  90 . Take washing the glass window  91  of the wallboard  90  for example. Operating processes of the second preferred embodiment of the automatic machine are input into the programmed numerical control. At first, the main driving devices  23  or the auxiliary driving devices  71  are switched on to drive all of the sliding engine bases  20  to simultaneously slide transversely along the long axial tracks  10  to correspond to the glass windows  91 . Then, the driving apparatuses  65 B of the bracket protective cover plates  60 B drive the sliding brush bases  50 B to slide longitudinally to correspond to specific positions of the glass windows  91 . When the sliding engine bases  20  and the sliding brush bases  50 B correspond to the glass windows  91 , the programmed numerical control controls cleaning water from tap water or pumps to flow into the water guide pipes  11  of the long axial tracks  10 . The long axial magnet bodies  151  and the magnets  32  of the magnetic valves  30  attract each other. Thus, the waterproof gaskets  34  are loosened from the magnets  32  of the magnetic valve  30  and the through holes  341  of the waterproof gasket  34  are revealed. Consequently, the cleaning water in the water guide pipes  11  of the long axial tracks  10  is drained from the magnetic valves  30  when the sliding engine bases  20  slide by. 
         [0070]    In the second preferred embodiment of the automatic machine, each of the magnetic valves  30  further has a bent pipe  300 B. The bent pipe  300 B is connected to an outlet of the magnetic valve  30 , is bending downward and has an outlet corresponding to the water collecting receptacle  68 B of the bracket protective cover plate  60 B. Therefore, the cleaning water drained from the water guide pipe  11  of the long axial track  10  further flows into the water collecting receptacle  68 B below the magnetic valve  30 , and flows through the guiding tube to flow into the water storage receptacle  69 B. When the water storage receptacle  69 B receives enough cleaning water, the programmed numerical control activates the power extending object  44 B to drive the brush bracket  40 B to slide toward the glass window  91 , then activates the pump mounted on the water storage receptacle  69 B to pump the cleaning water to the glass window  91 , and activates the vibrator  42 B to vibrate the brush bracket  40 B to clean the glass window  91 . 
         [0071]    At the same time, the main driving devices  23  or the auxiliary driving devices  71  drive the sliding engine bases  20  to slide transversely, and the driving apparatuses  65 B drive the sliding brush bases  50 B to slide longitudinally to allow the sliding engine bases  20  and the sliding brush bases  50 B to slide within corresponding glass windows  91  and to clean the corresponding glass windows  91 . After the glass windows  91  have been cleaned, the blower  63 B is switched on to dry the water drop on the glass windows  91 . Moreover, the power extending objects  44 B retract the brush brackets  40 B and the brush brackets  40 B depart from the glass windows  91 . Then, the sliding engine bases  20 , the bracket protective cover plates  60 B, the brush brackets  40 B and the sliding brush bases  50 B slide along the long axial tracks  10  to clean other glass windows  91  or slide back to and are stored at a side of the building. 
         [0072]    In the above-mentioned automatic machine, the long axial tracks  10  may be made of materials with antioxidant properties and are orderly mounted on the wallboard  90 . When the automatic machine is not in operation, the brush brackets  40 B are put aside of the building and the power extending objects  44 B retract the brush brackets  40 B. Thus, the brushes  41 B of the brush brackets  40 B are moved off the wallboard  90  and will not be easily deformed. The bracket protective cover plate  60 B protects the brush brackets  40 B and beautifies appearance of the automatic machine. 
         [0073]    Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.