Abstract:
The present invention relates to a hydraulic breaker comprising: a back head having a gas chamber provided therein; a cylinder disposed at the lower part of the back head, and having a hydraulic passage and a hydraulic space; a front head disposed at the lower part of the cylinder; a chisel provided inside the front head; a piston provided to reciprocate in the cylinder so as to hit the chisel; and a breaker main body having a plurality of penetration bolts integrally connecting the back head, the cylinder, and the front head, wherein the back head of the breaker main body is provided with a control valve for supplying and blocking hydraulic pressure to/from the hydraulic passage and the hydraulic space.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
       [0001]    This Application claims the benefit of priority and is a Continuation application of the prior International Patent Application No. PCT/KR2015/014350, with an international filing date of Dec. 28, 2015, which designated the United States, and is related to the Korean Patent Application No. 10-2015-0001775, filed Jan. 7, 2015, the entire disclosures of all applications are expressly incorporated by reference in their entirety herein. 
     
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
       [0002]    The present invention relates to a hydraulic breaker, and more particularly, to a hydraulic breaker in which a control valve of a breaker main body has an improved installation structure. 
       2. Description of Related Art 
       [0003]    Generally, hydraulic breakers are widely used to break rocks, concrete, and the like by being installed at excavators, which are construction machines. 
         [0004]    A breaker main body of such a conventional hydraulic breaker is illustrated in  FIG. 5 . As illustrated in  FIG. 5 , a breaker main body  110  of a conventional hydraulic breaker includes a back head  111  provided with a gas chamber  113  therein, a cylinder  121  disposed below the back head  111  and provided with a hydraulic path  123  and a hydraulic space  125 , a front head  131  disposed below the cylinder  121 , a chisel  135  installed inside the front head  131 , and a piston  141  reciprocally movably installed in the cylinder  121  so as to strike the chisel  135 . 
         [0005]    In addition, the back head  111 , the cylinder  121 , and the front head  131  are hermetically connected to each other by a plurality of through bolts  145 . 
         [0006]    In addition, the cylinder  121  is provided, on an inner side thereof, with a control valve  151  to supply hydraulic pressure to the hydraulic path  123  and the hydraulic space  125  of the cylinder  121  and operate the piston  141 , and the cylinder  121  is provided, on an outer side thereof, with an accumulator  155  to smooth flow of a fluid through the hydraulic path  123 . In particular, the control valve  151  frequently breaks down due to frequent hydraulic interruption. 
         [0007]    However, in the breaker main body  110  of a conventional hydraulic breaker, the control valve  151  is installed on the inner side of the cylinder  121  below the back head  111 , and thus, when the control valve  151  breaks down, the through bolts  145  are unfastened, the control valve  151  is replaced after disassembly of the back head  111 , the cylinder  121 , and the front head  131 , and then the back head  111 , the cylinder  121 , and the front head  131  are fastened again with the through bolts  145  to reassemble these elements. Thus, replacement of the control valve  151  is inconvenient and takes a long time, resulting in reduced productivity. 
         [0008]    In addition, a conventional hydraulic breaker includes a bracket that surrounds and supports the breaker main body and is installed in an excavator. 
         [0009]    Such a hydraulic breaker equipped with a bracket is disclosed in Korean Registered Utility Model No. 20-0340958. 
         [0010]    As disclosed in the prior art, in the bracket of a conventional hydraulic breaker, a lower end portion of a breaker main body inserted into the bracket is fixed to the bracket by a fixing member, and the three remaining surfaces except for the front surface of an upper end portion of the breaker main body are supported by the bracket by a fixing pad. 
         [0011]    In addition, a support member assembly, including a support piece, a support member, a movement prevention member, and a pad, is provided between the front surface of the breaker main body and the inside of the bracket. 
         [0012]    The support pieces are separated from each other on opposite sides of an upper end front surface portion of the inside of the bracket to be welded or protrude in an integrated manner. 
         [0013]    The support member is in surface contact with an inner side surface of the bracket while being caught by the support pieces, is provided with a fixing pin protruding from an upper outer side surface thereof, and is provided with an insertion hole in a surface thereof contacting the main body. 
         [0014]    The movement prevention member is fitted to the fixing pin of the support member to prevent vertical movement, and the pad is inserted into and coupled to the insertion hole. 
         [0015]    However, the bracket of a conventional hydraulic breaker has a tube welding structure, and thus the support member assembly is loosely assembled between the front surface of the breaker main body and the inside of the bracket. Accordingly, the support member moves upward, downward, leftward, or rightward, and thus the breaker main body is not satisfactorily fixed, resulting in occurrence of loud noise during operation and reduced work efficiency. 
       BRIEF SUMMARY OF THE INVENTION 
       [0016]    Therefore, the present invention has been made in view of the above problems, and it is one object of the present invention to provide a hydraulic breaker including a conveniently replaceable control valve and having enhanced productivity due to shortened replacement time. 
         [0017]    It is another object of the present invention to provide a hydraulic breaker in which a breaker main body is stably supported by a bracket, resulting in reduced noise during operation and enhanced work efficiency. 
         [0000]    The above and other objects can be accomplished by the present disclosure described below. 
         [0018]    In accordance with one aspect of the present invention, provided is a hydraulic breaker including a breaker main body including: a back head provided with a gas chamber therein; a cylinder positioned below the back head and provided with a hydraulic path and a hydraulic space; a front head positioned below the cylinder; a chisel installed inside the front head; a piston reciprocally movably installed in the cylinder so as to strike the chisel; and a plurality of through bolts connecting the back head to the cylinder to the front head, wherein the back head of the breaker main body is provided with a control valve to supply hydraulic pressure to the hydraulic path and the hydraulic space and block the supply. 
         [0019]    In this regard, the cylinder may be provided, on an outer side thereof, with an accumulator to smooth flow of a fluid through the hydraulic path. 
         [0020]    The hydraulic breaker may include a bracket surrounding and supporting the breaker main body and installed at an excavator, a lower end portion of the breaker main body inserted into the bracket being fixed to the bracket by a fixing member, and three remaining surfaces except for a front surface of an upper end portion of the breaker main body being supported by the bracket by a fixing pad; a stopper provided at an inner upper end portion of the bracket facing the front surface of the breaker main body and having a tapered portion where a distance between the front surface of the breaker main body and an inside of the bracket gradually decreases towards a lower end portion of the bracket; and a support member assembly having a closely contacting inclined portion that closely contacts the tapered portion and disposed between the stopper and the front surface of the breaker main body to support the front surface of the upper end portion of the breaker main body on the inside of the bracket. 
         [0021]    The support member assembly may include a fixture provided with the closely contacting inclined portion closely contacting the tapered portion, an insertion hole formed in a plate surface thereof facing the front surface of the breaker main body, and a fixing pin protruding from an upper portion thereof, and inserted between the stopper and the front surface of the breaker main body; a movement prevention member fitted into and coupled to the fixing pin to prevent vertical movement; and a shock absorption pad inserted into and coupled to the insertion hole to absorb shock. 
         [0022]    As is apparent from the foregoing description, a control valve is installed at a back head of a breaker main body, and thus the control valve may be conveniently replaced and productivity may be enhanced due to shortened replacement time. 
         [0023]    In addition, a bracket has an improved support structure for the breaker main body, and thus the breaker main body is stably supported by the bracket, resulting in reduced occurrence of noise during operation and enhanced work efficiency. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  is a broken perspective view of an essential part of a breaker main body of a hydraulic breaker according to the present invention. 
           [0025]      FIG. 2  is a cross-sectional view of  FIG. 1 . 
           [0026]      FIG. 3  is a cross-sectional view illustrating an assembled state of a breaker main body and a bracket of a hydraulic breaker according to the present invention. 
           [0027]      FIG. 4  is an exploded perspective view illustrating an essential part of a support member assembly and a stopper of  FIG. 3 . 
           [0028]      FIG. 5  is a broken perspective view illustrating an essential part of a breaker main body of a conventional hydraulic breaker. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]    Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 
         [0030]      FIGS. 1 and 2  illustrate a breaker main body of a hydraulic breaker according to the present invention. 
         [0031]    As illustrated in the drawings, the breaker main body  10  of a hydraulic breaker according to the present invention includes a back head  11 , a cylinder  21 , a front head  31 , a chisel  35 , and a piston  41 . In this regard, to aid in understanding of an operation of the breaker main body  10 , a left side cross-sectional view of  FIG. 2  illustrates a state in which the chisel  35  of the breaker main body  10  is lowered, and a right side cross-sectional view of  FIG. 2  illustrates a state in which the chisel  35  is raised. 
         [0032]    The back head  11  is provided with a gas chamber  13  therein, and is positioned at the uppermost end of the breaker main body  10 . The back head  11  is provided with a control valve  51  detachably, which will be described below, and is provided with a valve cover  15  to cover the control valve  51 . 
         [0033]    The cylinder  21  is positioned below the back head  11 , and is provided with a hydraulic path  23  and a hydraulic space  25 . 
         [0034]    The front head  31  is positioned below the cylinder  21 . 
         [0035]    The back head  11 , the cylinder  21 , and the front head  31  are hermetically connected to one another by a plurality of through bolts  45 , and thus the breaker main body  10  forms an overall rectangular cylindrical appearance. 
         [0036]    The chisel  35  is installed inside the front head  31  to be struck by the piston  41  to break rocks, concrete, and the like. The chisel  35  can ascend or descend within a chisel groove  39  having an elongated hole shape and formed in the chisel  35 , in a state of being supported by a chisel pin  37 . 
         [0037]    The piston  41  is reciprocally movably installed in the hydraulic space  25  of the cylinder  21  so as to strike the chisel  35 . The piston  41  reciprocates in the hydraulic space  25  of the cylinder  21  by hydraulic interruption of the control valve  51 . 
         [0038]    The control valve  51  is detachably in the back head  11  of the breaker main body  10 , and is covered by the valve cover  15  provided in the back head  11 . The control valve  51  supplies hydraulic pressure to the hydraulic path  23  and the hydraulic space  25  of the cylinder  21  and blocks the supply. 
         [0039]    As such, by installing the control valve  51  in the back head  11  of the breaker main body  10 , the control valve  51  may be conveniently replaced, and productivity may be enhanced due to shortened replacement time. 
         [0040]    That is, in the breaker main body  10  of the hydraulic breaker according to the present invention, when the control valve  51  breaks down, the through bolts  45  integrally connecting the back head  11  to the cylinder  21  to the front head  31  do not need to be unfastened, and only the control valve  51  installed in the back head  11  may be conveniently replaced after being disassembled. 
         [0041]    In addition, the breaker main body  10  of the hydraulic breaker according to the present invention includes an accumulator  55 . The accumulator  55  is provided at an outer side of the cylinder  21  to smooth flow of a fluid through the hydraulic path  23 . For example, when a fluid is not supplied to the hydraulic space  25  due to rapid operation of the control valve  51  that supplies hydraulic pressure, smooth supply conditions may be maintained by the accumulator  55 . 
         [0042]    The hydraulic breaker according to the present invention includes a bracket  60  that surrounds and supports the breaker main body  10 , and is installed at an excavator (not shown). 
         [0043]    The bracket  60  has a cylindrical shape with openings at opposite sides thereof, and an upper end portion of the bracket  60  has a larger cross-sectional shape than that of a lower end portion thereof to prevent the breaker main body  10  from interfering with the accumulator  55 . 
         [0044]    A lower end portion of the breaker main body  10  inserted into the bracket  60  is fixed to the bracket  60  by a fixing member  61 , and the three remaining surfaces except for a front surface of an upper end portion of the breaker main body  10  are supported by the bracket  60  by a fixing pad  63 . 
         [0045]    The front surface of the breaker main body  10  and an inner upper end portion of the bracket  60  facing the front surface of the breaker main body  10  are supported by a stopper  71  and a support member assembly  81 . 
         [0046]    The stopper  71  is configured in pairs, and is fixed by welding or the like to the inner upper end portion of the bracket  60  facing the front surface of the breaker main body  10 , with a gap therebetween. In addition, each stopper  71  has a tapered portion  73  where a distance between the front surface of the breaker main body  10  and the inside of the bracket  60  gradually decreases towards a lower end portion of the bracket  60 . In the present embodiment, the stopper  71  is configured in pairs, but the present invention is not limited thereto, and a single stopper  71  may be provided. 
         [0047]    The support member assembly  81  is disposed between the stopper  71  and the front surface of the breaker main body  10  to support the front surface of the upper end portion of the breaker main body  10  on the inside of the bracket  60 . The support member assembly  81  includes a fixture  83 , a movement prevention member  91 , and a shock absorption pad  93 . 
         [0048]    The fixture  83  is provided, on one side thereof, with a closely contacting inclined portion  85  that is inclined with respect to the stopper  71  and closely contacts the tapered portion  73  of the stopper  71 , and has a rectangular cylindrical shape. An insertion hole  87  to which the shock absorption pad  93  is coupled is formed in a plate surface of a main body of the fixture  83  facing the front surface of the breaker main body  10 . In addition, the fixture  83  is provided with a pair of fixing pins  89  protruding from an upper surface thereof, with a gap therebetween. 
         [0049]    The movement prevention member  91  has an annular shape, is made of a rubber material, and is fitted into and coupled to the fixing pins  89  to prevent vertical movement, for example, longitudinal movement, of the breaker main body  10 . In this regard, the movement prevention member  91  may be longer than the fixing pins  89 . 
         [0050]    The shock absorption pad  93  has a plate shape, is made of a rubber material, and is inserted into and coupled to the insertion hole  87  of the fixture  83  to absorb shock between the front surface of the breaker main body  10  and the inside of the bracket  60 . 
         [0051]    In this case, reference numeral  95 , which has not been described, denotes a head plate, and the head plate  95  blocks an upper opening of the bracket  60 . 
         [0052]    By such configuration, a process of assembling the breaker main body  10  and the bracket  60  will be described briefly as follows. 
         [0053]    When the breaker main body  10  is inserted into the bracket  60  towards a lower part of the bracket  60  from an upper part thereof, the lower end portion of the breaker main body  10  is fixed to the bracket  60  by the fixing member  61 , and the three remaining surfaces except for the front surface of the upper end portion of the breaker main body  10  are supported by the bracket  60  by a fixing pad  63 . 
         [0054]    In this regard, the support member assembly  81  is assembled between the stopper  71  positioned at the inner upper end portion of the bracket  60  and the front surface of the breaker main body  10 . 
         [0055]    That is, in a process of installing the support member assembly  81  at the stopper  71 , the closely contacting inclined portion  85  of the fixture  83  descends while sliding along the tapered portion  73  of the stopper  71 , and, when the support member assembly  81  does not descend any longer, the support member assembly  81  is closely supported by the stopper  71 , and thus the support member assembly  81  does not move leftward or rightward. 
         [0056]    When the support member assembly  81  is closely supported by the stopper  71 , the head plate  95  is assembled to an upper side of the bracket  60 . 
         [0057]    In this regard, the head plate  95  pressurizes the movement prevention member  91  of the support member assembly  81  towards the lower part of the bracket  60 . 
         [0058]    In this manner, assembly of the breaker main body  10  and the bracket  60  is completed, and the support member assembly  81  is fitted between the head plate  95  and the stopper  71 , and thus both vertical movement and horizontal movement of the support member assembly  81  are prevented. 
         [0059]    Accordingly, the breaker main body  10  is stably supported by the bracket  60 , resulting in reduced occurrence of noise during operation and enhanced work efficiency. 
         [0060]    As such, according to the present invention, a control valve is provided in a back head of a breaker main body, whereby the control valve may be conveniently replaced, and productivity may be enhanced due to shortened replacement time. 
         [0061]    In addition, a bracket has an improved support structure for the breaker main body, and thus the breaker main body is stably supported by the bracket, resulting in reduced occurrence of noise during operation and enhanced work efficiency. 
         [0062]    It is obvious to those of ordinary skill in the art that the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the spirit and scope of the present invention. Thus, such changes or modifications should be construed as being within the scope of the following claims of the present invention.