BACKGROUND OF THE INVENTION  
         [0001]    (a) Technical Field of the Invention The present invention relates to the technology of dust-removing within a dust-collecting apparatus, and in particular, a dust-removing device which can automatic detect the dust blockage of the filtering tubes of the dust-collecting apparatus and clean away the dust.  
           [0002]    (b) Description of the Prior Art  
           [0003]    Dust-collecting apparatus is an essential and important electrical appliance in removing dust particles in work sites such as furniture manufacturing plant, saw-mill plant or sand and quarry industries to remove the high content of dust particles in the air. Thus, the workers at the work site can breathe in cleaner air so as to keep a healthy body. After the apparatus has been used and deployed for a while, the apparatus has to be dismantled to clean away the dust particles that blocking the filtering tubes. However, such dismantling of the apparatus is not economical and the procedures of the dismantling are laborious and complicated. In addition, the dust that collected has to be cleaned using high pressurized air and this again will cause another pollution to the air. In view of the above, it is an object of the present invention to provide a dust-removing device for the filtering tube of a dust-collecting apparatus which can solve the above-mentioned drawbacks.  
         SUMMARY OF THE INVENTION  
         [0004]    Accordingly, it is an object of the present invention to provide a dust-removing device for the filtering tube of a dust-collecting apparatus having a filtering means arranged with rows of hollow filtering tubes and a dust-suction hole being positioned at one side of the dust-collecting apparatus to communicate with the interior of the apparatus and the interior of the apparatus being formed with an air-outlet channel and a blower positioned in alignment with the channel, and an air discharge tube for the filtered air at the housing of the apparatus, wherein a dust-removing device is mounted on the dust-collecting apparatus and the housing of the apparatus is provided with a controller connected with a vacuum detector positioned at the air-outlet channel, and the apparatus is provided with a high pressure storage tank connected to an air source, and the high pressure storage tank is mounted with a control valve controlling by a controller and the control valve is connected to a series of nozzle tubes corresponding to the filtering tube, and the nozzle tubes is provided with a plurality of air holes corresponding to the interior of the filtering tubes; thereby a dust-removing device which can self-cleaning of the filtering tubes of the dust-collecting apparatus.  
           [0005]    Another object of the present invention is to provide a dust-removing device for the filtering tube of a dust-collecting apparatus, wherein the high pressurized air storage tank is locked within the interior of the dust-collecting apparatus by means of a locking plate.  
           [0006]    The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
           [0007]    Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]    [0008]FIG. 1 is an exploded perspective view of a dust-removing device for the filtering tube of a dust-collecting apparatus, showing the relative positions of the components constituted the device in accordance with the present invention.  
         [0009]    [0009]FIG. 2 is a schematic view of a dust-removing device for the filtering tube of a dust-collecting apparatus, showing the interior of the device and the action of vacuuming in accordance with the present invention.  
         [0010]    [0010]FIG. 3 is a further schematic view of a dust-removing device for the filtering tube of a dust-collecting apparatus, further the action of vacuuming in accordance with the present invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0011]    The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
         [0012]    In accordance with the present invention, as shown in FIGS. 1 and 2, there is shown a dust-removing device for the filtering tubes of a dust-collecting apparatus having a body  10  installed with a filtering device  20 . The lower section of the filtering device  20  is positioned with a dust-collection box  15  for collection of the filtered dust from the filtering device  20 , and the filtering device  20  is provided with a plurality of hollow filtering tubes  21  arranged in rows. One side of the body  10  of the dust-collecting apparatus is provide with a dust-suction hole  22  connected to the interior of the body  10  and a partition board  23  is used to form an air outlet channel  24  within the body  10 . A blower  25  is positioned on the body  10  corresponding to the air outlet channel  24 , and thus, when the blower  25  rotates, the dust at the surrounding is sucked to the body  10  of the dust collecting device via the dust suction hole  22  and is filtered by the filtering tubes  21  such that the dust will be collected in the dust-collection box  15 . The filtered air is discharged via the filtering tubes  21  and the air outlet channel  24 .  
         [0013]    Referring again to FIGS. 1 and 2, the body  10  of the dust-collection apparatus is provided with a dust-removing device  30  and the device  30  is provided with a controller  31  at the housing thereof. The controller  31  is connected to a vacuum detector  32  positioned onto a partition board  23 , and the body  10  makes use of a locking plate  34  to lock a high pressurized air storage tank  33  at one side of the filtering tubes  21 . The storage tank  33  is connected to the high pressurized air source of the air compressor via an air transporting tube  330 .  
         [0014]    There are a plurality of control valves  35  on the high pressurized air storage tank  33  and the control valves  35  are used to connect to the nozzle tubes  36  corresponding to the filtering tubes  21 , and the nozzle tubes  36 , corresponding to the interior of the air hole  37 , forms into corresponding air holes  37  so that the high pressurized air is blown into the interior of the filtering tubes  21  through the air hole  37 . In addition, on the upper section of the filtering tubes  21  of the body  10 , a plurality of fixing rods  38  are provided and the fixing rod  38  is provided with a plurality of positioning clips  39  which can clip the nozzle tubes  36  and to support and to hold the nozzle tubes  36 .  
         [0015]    In view of the above, the high pressurized air is blown into the filtering tubes  21  and the high pressurized air is blown from the interior of the filtering tubes  21  to the exterior and the dust adhered to the filtering tubes is blown off to be collected within the dust-collection box  15 . Thus, a dust-removing device for the filtering tubes of a dust-collecting apparatus is obtained.  
         [0016]    In application, as shown in FIGS. 2 and 3, after the blower  25  is in operation for a while, dust particles are sucked into via the dust-suction hole  22  and filtered by the filtering tubes, and the filtered air is discharged from the air-outlet channel  24  via the discharged tube  26 , and after in operation for a while, the dust particles will be collected at the external wall of the filtering tube  21 . When the dust particles are collected to a certain extent and the blower  25  continues to suck air, the interior of the air outlet channel  24  is closed to vacuum. As a result when vacuum is formed at the channel  24  and is detected by the vacuum detector  32  at a certain value, it indicates that the filtering tubes  21  need to be cleaned. At this instance, the vacuum detector  32  will emit a signal to inform the controller  31  and the controller  31  will shut off the blower  25  and cause the opening of the control valve  35  on the high pressurized air storage tank  33  and the high pressurized air will be ejected via the air hole  37  of the nozzle tubes  36  to the interior of the filtering tubes  21  (as shown in FIG. 3) and the high pressurized air is blown to the exterior via the interior of the filtering tube  21  and the adhered dust particles on the external wall of the filtering tubes  21  will be blown off. The dust-collection box  15  is used at the same time for the collection of the dust particles so as to keep the environment clean. When the dust particles have been cleaned for a while, the blower  25  is switched on again and the control valve  35  is shut off.  
         [0017]    The advantages of the dust-removing device for the filtering tubes of a dust-collecting apparatus in accordance with the present invention are as follows:  
         [0018]    (1) The cleaning of the dust particles is automatic. By employing the vacuum detector  32  at the air-outlet channel  24 , when the filtering tubes  21  are blocked by dust particles at a certain extent, the controller will be switched on to stop the operation of the blower  25  and to initiate the control valve  35  and a high pressurized air is used to clean away the dust particles on the filtering tube  21 .  
         [0019]    (2) The dust-collection efficiency is maintained. In view of the above automatic cleaning of the filtering tubes  21 , the dust-collection efficiency of the dust-collection apparatus is always maintained to an optimal level.  
         [0020]    (3) The environment is kept clean in the course of cleaning of the dust particles. As the dust-collecting apparatus does not need to be dismantled and therefore the dust particles that have been collected will not exposed to the environment to affect the health of the workers on the work sites.  
         [0021]    It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
         [0022]    While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
A dust-removing device for the filtering tube of a dust-collecting apparatus is disclosed. The dust-removing device is provided with a controller and a high pressurized air storage tank, and the tank employs a control valve to connect the nozzle tubes corresponding to the filtering tubes. The controller makes use of the vacuum detector to determine the blockage condition of dust in the filtering tubes so as to open the control valve to clean away the dust on the dust-filtering tubes. The dust-removing device thus automatically cleans away the dust and maintains a clean dust-collecting apparatus, whereby the longevity of the device is prolonged.