Patent Publication Number: US-10770880-B2

Title: Tool for connecting busbars driven by a pneumatic motor driving unit

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/540,074, filed Aug. 14, 2019, which is a continuation of U.S. patent application Ser. No. 16/510,970, filed Jul. 14, 2019, which is a continuation of U.S. patent application Ser. No. 15/919,242, filed Mar. 13, 2018, now U.S. Pat. No. 10,396,536, which claimed priority to China Patent Application No. 201710229170.0, filed Apr. 10, 2017, the disclosures of which are hereby incorporated herein by reference in their entireties. 
    
    
     BACKGROUND OF THE INVENTION 
     The invention relates to an electric device, especially to a tool for connecting busbars. 
     In a field of power distribution, partly overlapping two busbars is usually used to be a manner of a connection between two busbas, then using bolts and nuts to fasten them. As this manner required, there is a certain length of two busbars needed to overlap for keeping a current density of a touching surface within a normal range of values so as to make the connecting part meet requirements of related standards. In order to keep a low temperature rising of an electric device, usually a length of overlapping is increased for increasing a touching surface so as to reduce a current density thereof. However, increasing the length of overlapping may increase amounts of busbars resulted in increasing cost. Electric clearance or phase distance between busbars may be reduced as a result of bolts used for fastening, in order not to reduce the electric clearance or phase distance, a distance between busbars needs to be increased, however increasing the distance necessarily enlarge an occupation space of busbars. How to increase a touching surface for reducing a temperature rising not resulted in reducing electric clearance or phase distance or enlarging occupation space of busbars, there is a new manner of connecting busbars to solve the above problem, busbars are connected in a form of butt-and-butt connecting via connecting rods, see  FIG. 21 . 
     BRIEF SUMMARY OF THE INVENTION 
     The object of the invention is to provide a tool used to mount connecting rods to busbars for connecting busbars in a form of butt-and-butt connecting. 
     Such object is achieved by providing a tool for connecting busbars as defined in claim  1 . Further advantageous according to the invention will be apparent from the dependent claims. 
     The invention provides a tool for connecting busbars, said tool comprises an electric motor driving unit and an electric control unit connected with an electrical power input; said tool further comprises a stationary portion removably connected to a first busbar, a movable portion removably connected to a second busbar and a loading portion for clamping connecting rods. Said connecting rod configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars being connected by said connecting rod. Said movable portion is movably connected to a first and second stationary shaft of said stationary portion, said movable portion is connected to a movable shaft by a screw pair, said movable portion is fixedly connected to said electric motor driving unit of said stationary portion, said movable shaft is driven to rotate around its axis by said electric motor driving unit, said loading portion is movably connected to said second stationary shaft of said stationary portion and slides between a stationary portion body and a movable portion body, said loading portion rotates around said second stationary shaft. 
     Said stationary portion comprises said first stationary shaft, said second stationary shaft parallel to said first stationary shaft, said movable shaft parallel to said first stationary shaft, a first stationary plate perpendicular to and fixedly connected to said first and second stationary shaft, a second stationary plate perpendicular to and fixedly connected to said first and second stationary shaft, said electric motor driving unit arranged between said first and second stationary plate, a third stationary plate perpendicular to and fixedly connected to said first and second stationary shaft, a fourth stationary plate perpendicular to and fixedly connected to said first and second stationary plate, and a first positioning pillar arranged to said fourth stationary plate for inserting into a positioning hole of said first busbar. Said movable shaft is fixedly connected to a rotating shaft of said electric motor driving unit by a coupler. Said movable portion comprises a seventh stationary plate, a fifth stationary plate perpendicular to and fixedly connected to said seventh stationary plate, a sixth stationary plate perpendicular to and fixedly connected to said seventh stationary plate, a second positioning pillar arranged to said seventh stationary plate for inserting into a positioning hole of said second busbar, a screw nut arranged to said fifth stationary plate for coupling with a screw portion of said movable shaft, a clamping portion for clamping said second busbar arranged between said fifth and sixth stationary plate and through said seventh stationary plate, and a limiting portion arranged to said seventh stationary plate for limiting said clamping portion to move. Said loading portion comprises two movable plates which respectively open or close with respect to an axis of said second stationary shaft, said movable plate comprises a receiving cavity for receiving connecting rods. Said first and second stationary shaft of said stationary portion penetrate through said movable portion, an end of said movable shaft of said stationary portion rotatably connects to said third stationary plate, said movable portion slides between said third and first stationary plate of said stationary portion, said second stationary shaft of said stationary portion penetrates through said loading portion, which slides between said fifth stationary plate of said movable portion and said first stationary plate of said stationary portion and rotates around said second stationary shaft, said fifth stationary plate is parallel to said sixth stationary plate. 
     Said stationary portion further comprises a first heating portion arranged to said fourth stationary plate for heating said first busbar, said first heating portion movably connects to said fourth stationary plate to adjust a distance between said first heating portion and said first busbar. Said movable portion further comprises a second heating portion arranged to said seventh stationary plate for heating said second busbar, said second heating portion movably connects to said seventh stationary plate to adjust a distance between said second heating portion and said second busbar. 
     Said stationary portion further comprises a supporting portion for supporting a loading portion, a supporting end of said supporting portion penetrates through a first stationary plate, a length of said supporting end protruding from said first stationary plate ( 14 ) is adjusted by a sliding block of said supporting portion. 
     Said limiting portion comprises a base, a straight pin which has an interference fit with said base, a limiting end for partly inserting into said base, a spring for replacing said limiting end, a side cover fixedly connected to said limiting end and a ball head for operating. Said side cover is fastened to said base by snap-fits, said limiting end comprises a tooth for meshing with a teeth groove of said clamping portion, said tooth comprises a recess for matching with said straight pin, operating said ball head is to release meshing between said tooth and said teeth groove of said clamping portion, said spring acts on said tooth to make said tooth mesh with said teeth groove. 
     Said first stationary shaft is fixedly connected to said first stationary plate by a first straight pin, said second stationary shaft is fixedly connected to said first stationary plate by a second straight pin, said movable shaft is rotatably connected to said first stationary plate by a sleeve, said first stationary shaft is fixedly connected to said second stationary plate by a third straight pin, said second stationary shaft is fixedly connected to said second stationary plate by a fourth straight pin. 
     Said first stationary shaft is fixedly connected to said third stationary plate by a first spring pin, said second stationary shaft is fixedly connected to said third stationary plate by a second spring pin, said movable shaft is rotatably connected to said third stationary plate by a sleeve. 
     The invention also provides a tool for connecting busbars, said tool comprises a pneumatic motor driving unit and an electric control unit connected with an electrical power input; said tool further comprises a stationary portion removably connected to a first busbar, a movable portion removably connected to a second busbar and a loading portion for clamping connecting rods. Said connecting rod configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars being connected by said connecting rod. Said movable portion is movably connected to a first and second stationary shaft of said stationary portion, said movable portion is connected to a movable shaft by a screw pair, said movable portion is fixedly connected to said pneumatic motor driving unit of said stationary portion, said movable shaft is driven to rotate around its axis by said pneumatic motor driving unit, said loading portion is movably connected to said second stationary shaft of said stationary portion and slides between a stationary portion body and a movable portion body, said loading portion rotates around said second stationary shaft. 
     The invention also provides a tool for connecting busbars, said tool comprises an hydraulic motor driving unit and an electric control unit connected with an electrical power input; said tool further comprises a stationary portion removably connected to said first busbar, a movable portion removably connected to said second busbar and a loading portion for clamping connecting rods. Said connecting rod configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars being connected by said connecting rod. Said movable portion is movably connected to a first and second stationary shaft of said stationary portion, said movable portion is connected to a movable shaft by a screw pair, said movable portion is fixedly connected to said hydraulic motor driving unit of said stationary portion, said movable shaft is driven to rotate around its axis by said hydraulic motor driving unit, said loading portion is movably connected to said second stationary shaft of said stationary portion and slides between a stationary portion body and a movable portion body, said loading portion rotates around said second stationary shaft. 
     Advantageous Effects 
     (1) It is achieved that a plurality of connecting rods are simultaneously mounted to busbars and that two busbars are connected in a form of butt-and-butt connecting. 
     (2) A movable portion comprises a clamping portion and a second positioning pillar, while a stationary portion comprises a first positioning pillar, such arrangement benefits that a second busbar is capable to adjust its position before connecting till said second busbar, connecting rods, and a first busbar are totally aligned with one another. Each product needs to adjust its position according to site condition when they are in an assemble process, because accuracy in busbar assemble site is not very high. Said second busbar and said connecting tool can be seen as one whole part because of a movable portion clamping said second basbar, this whole part can rotate around an axis of a first positioning pillar, also can move along an axis of said first positioning pillar, said second busbar can slide along a stationary shaft of a stationary portion when it is clamped by a movable portion. Therefore, said second busbar is capable to adjust its position before connecting till said second busbar, connecting rods and said first busbar are totally aligned with one another, such arrangement improves tool adaptability to working condition. 
     (3) Each of a movable portion and a stationary portion comprises a handle, which comprises buttons having the same functions, only when two hands all hold handles and simultaneously active relative buttons, relative functions of tool can work, such arrangement avoids harm to safety when connecting busbars. 
     (4) A supporting end is telescopic to solve a storage problem after a loading portion finishing mounting connecting rods, two movable plates are supported by a supporting end to make a loading portion get out of busbars connecting path so as to avoid busbars sticking a loading portion when connecting busbars, it is good to connect busbars. 
     (5) Open-or-close loading portion is slideable along a second stationary shaft and also rotatable around said second stationary shaft, such arrangement is convenient for loading connecting rods. 
     (6) Using heating portion to heat busbars in a manner of high frequency electromagnetic radiation, it is an homogeneous heating to improve heating efficiency, there is no open fire at site, hidden danger is removed to improve working conditions. 
     (7) There is an adjustment arranged to a heating portion, so heating portion is capable to heat different thickness of busbar, such arrangement improves tool&#39;s adaptability to different kinds of busbars. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       Further characteristics and advantages of the invention will emerge from the description of preferred, but not exclusive embodiments of the tool according to the invention, non-limiting examples of which are provided in the attached drawings, in which: 
         FIG. 1  is a 3d-drawing of a tool for connecting busbars of embodiment 1, wherein a movable portion is at a first position, a loading portion is closed. 
         FIG. 2  is a 3d-drawing of  FIG. 1  from another view, wherein a movable portion is at a second position, a loading portion is open. 
         FIG. 3  is a 3d-drawing of  FIG. 1 , wherein a shell and an electric control part are removed. 
         FIG. 4  is a 3d-drawing of a stationary portion of  FIG. 1 , wherein a shell and an electric control part are removed. 
         FIG. 5  is a sectional 3d-drawing of a tool for connecting busbars of the invention. 
         FIG. 6  is a sectional 3d-drawing of a stationary portion of  FIG. 1 . 
         FIG. 7  is an exploded 3d-drawing of a tool of  FIG. 5 . 
         FIG. 8  is a sectional 3d-drawing of a limiting portion of the invention, wherein a tooth is at a meshing status. 
         FIG. 9  is a sectional 3d-drawing of a limiting portion of the invention, wherein a tooth is not at a meshing status. 
         FIG. 10  is an exploded 3d-drawing of a limiting portion of the invention. 
         FIG. 11-20  are drawings of connecting steps using a tool of embodiment 1. 
         FIG. 21  is a sectional 3d-drawing of busbars after connecting. 
         FIG. 22  is a 3d-drawing of a tool for connecting busbars of embodiment 2. 
     
    
    
     LIST OF REFERENCE CHARACTERS 
     
         
         
           
               1 . stationary portion; 
               2 . movable portion; 
               3 . loading portion; 
               11 . first stationary shaft; 
               12 . second stationary shaft; 
               13 . movable shaft; 
               14 . first stationary plate; 
               15 . electric motor driving unit; 
               16 . second stationary plate; 
               17 . first heating portion; 
               18 . supporting portion; 
               19 . third stationary plate; 
               110 . fourth stationary plate; 
               111 . first positioning pillar; 
               112 . coupler; 
               21 . screw nut; 
               22 . fifth stationary plate. 
           
         
       
    
     DETAILED DESCRIPTION OF THE INVENTION 
     At site of connecting busbars, when it is needed to connect two busbars, one of said two busbars is already fixedly mounted, the other one is movable, the movable one is taken to connect to the fixedly mounted one. The fixedly mounted busbar is defined as a first busbar while the movable busbar is defined as a second busbar in the invention. It is needed to preprocess busbars before connecting process, a pre-hole is arranged to a surface which is for connecting so as to receive a connecting rod, a depth of pre-hole is slightly greater than half of connecting rod, a positioning hole is arranged to a surface which faces a tool so as to match with a positioning pillar of tool, a diameter of positioning hole is slightly greater than a diameter of positioning pillar to have a clearance fit between them. 
     Embodiment 1 
     Referring to  FIG. 1  and  FIG. 2 , a tool for connecting busbars comprises a stationary portion  1  removably connected to a first busbar, a movable portion  2  removably connected to a second busbar and a loading portion  3  for clamping connecting rods. Said connecting rod configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars being connected by said connecting rod. Said movable portion  2  is movably connected to a first and second stationary shaft  11 , 12  of said stationary portion  1 , said movable portion  2  is connected to a movable shaft  13  by a screw pair. Said loading portion  3  is movably connected to said second stationary shaft  12  of said stationary portion  1  and slides between a said stationary portion body and a movable portion body. Each of said stationary and movable portion  1 , 2  comprises a shell with a handle, said handle comprises a plurality of buttons connected to an electric control unit, an electrical power input is connected to said electric control unit. Each of two sides of said stationary portion  1  comprises a sliding block, pushing said sliding block is to make a supporting end of a supporting portion  18  protrude from or retract into said stationary portion  1 . When said supporting end is at a protruding status, said supporting end supports two movable plates of said loading portion  3  which are at an open status to keep said supporting portion  3  at an open status is to avoid negative influence on busbars connecting. A first positioning pillar  111  is arranged to a surface of said stationary portion  1  which is to match with said first busbar, said first positioning pillar  111  matches with a positioning hole preprocessed to said first busbar so that there is no relative displacement between said stationary portion  1  and said first busbar with respect to a length direction of said first busbar when connecting busbars, that is to say that said stationary portion  1  and said first busbar are relatively static when connecting blusbars. Said first positioning pillar  111  withdraws from said positioning hole of said first busbar after busbars connecting, it is achieved that said stationary portion  1  is removably connected to a busbar. A first heating portion  17  is perpendicularly arranged to a fitting side between said first busbar and said stationary portion  1 , a heating surface of said first heating portion  17  faces said first busbar. Said first heating portion  17  heats said first busbar under control of said electric control unit after activating a heating button of said handle. Said first busbar with good electrical conductivity is in a high frequency alternative magnetic field created by a coils arranged in said first heating portion  17 , said first busbar heats up because of eddy effect. A second positioning pillar  25  is arranged to a surface of said movable portion  2  which is to match with said second busbar, said second positioning pillar  25  matches with a positioning hole preprocessed to said second busbar so that there is no relative displacement between said movable portion  2  and said second busbar with respect to a length direction of said second busbar when connecting busbars, that is to say that said movable portion  2  and said second busbar are relatively static when connecting blusbars. Said second heating portion  26  is perpendicularly arranged to a fitting side between a second busbar and said movable portion  2 , a heating surface of said second heating portion  26  faces said second busbar. Said second heating portion  26  heats said second busbar under control of said electric control unit after activating a heating button of said handle. Said second busbar with good electrical conductivity is in a high frequency alternative magnetic field created by a coils arranged in said second heating portion  26 , said second busbar heats up because of eddy effect. A clamping portion  27  is perpendicularly arranged to a fitting side between said movable portion  2  and said second busbar, manually adjusting a length of clamping portion  27  is to clamp different width of busbars, said clamping portion  27  comprises a teeth groove, a meshing between said teeth groove and a limiting portion  24  arranged in said movable portion  2  is to keep a clamping length of said clamping portion  27  so as to achieve a function of said clamping portion  27  clamping said second busbar, said second busbar does not secede from said movable portion  2  in a connecting process, said movable portion  2  clamps said second busbar to move to a first busbar which is already fixedly mounted. 
     A meshing between said teeth groove and said limiting portion  24  is released by operating a ball head  49  of said limiting portion  24  so as to release a limiting effect on said clamping portion  27  from said limiting portion  24 , then a clamping length is manually adjusted to achieve a function of said clamping portion  27  releasing a second busbar, it is also achieved that said movable portion  2  is removably connected to a busbar. A function of said clamping portion  27  to release said second busbar is achieved by a meshing between gears and said teeth groove, it is achieved that said movable portion  2  is removably connected to a busbar. There is an adjustment arranged to each said first and second heating portion  17 , 26  to be adaptable to different thickness of busbars, high frequency alternative magnetic heating is arranged to heating portion to heat busbar quickly without open fire, it is an homogeneous heating to improve heating efficiency, there is no open fire at site, hidden danger is removed to improve working conditions. 
     Referring to  FIG. 4 , said stationary portion  1  comprises said first stationary shaft  11 , said second stationary shaft  12  parallel to said first stationary shaft  11 , said movable shaft  13  parallel to said first stationary shaft  11 , a first stationary plate  14  perpendicular to and fixedly connected to said first and second stationary shaft  11 , 12 , a second stationary plate  16  perpendicular to and fixedly connected to said first and second stationary shaft  11 , 12 , said electric motor driving unit  15  arranged between said first and second stationary plate  14 , 16 , a coupler  112  for connecting said electric motor driving unit  15  and said movable shaft  13 , a third stationary plate  19  perpendicular to and fixedly connected to said first and second stationary shaft  11 , 12 , a fourth stationary plate  110  perpendicular to and fixedly connected to said first and second stationary plate  14 , 16 , a first positioning pillar  111  arranged to said fourth stationary plate  110  for inserting into a positioning hole of said first busbar, a first heating portion  17  arranged to said fourth stationary plate  110  for heating said first busbar, and a supporting portion  18  for supporting a loading portion  3 . An end of said movable shaft  13  is fixedly connected to a rotating shaft of said electric motor driving unit  15  by said coupler  112 , said electric motor driving unit  15  drives said movable shaft  13  to rotate around its axis under control of said electric control unit, another end of said movable shaft  13  is rotatably connected to said third stationary plate  19  by a sleeve. Said first heating portion  17  is movably connected to said fourth stationary plate  110  to adjust a distance between said first heating portion  17  and said first busbar, said first heating portion  17  heats said first busbar under control of said electric control unit, heating manner is a high frequency alternative magnetic heating. A supporting end of said supporting portion  18  penetrates through a first stationary plate  14 , a length of said supporting end protruding from said first stationary plate  14  is adjusted by a sliding block of said supporting portion  18 . Said loading portion  3  comprises two movable plates which respectively open or close with respect to an axis of said second stationary shaft  12 , said movable plate comprises a receiving cavity for receiving connecting rods and a magnetic element for keeping said loading portion  3  at a close status, a distance between each receiving cavity is identical to a distance between holes preprocessed to busbars. A connecting rod is clamped tightly by two movable plates when said loading portion  3  is at close stat, there is no relative displacement between said connecting rod and said movable plates. 
     Referring to  FIG. 3 , said movable portion  2  comprises a seventh stationary plate  28 , a fifth stationary plate  22  perpendicular to and fixedly connected to said seventh stationary plate  28 , a sixth stationary plate  29  perpendicular to and fixedly connected to said seventh stationary plate  28 , a second positioning pillar  25  arranged to said seventh stationary plate  28  for inserting into a positioning hole of said second busbar, a screw nut  21  arranged to said fifth stationary plate  22  for coupling with a screw portion of said movable shaft  13 , a clamping portion  27  for clamping said second busbar arranged between said fifth and sixth stationary plate  22 , 29  and through said seventh stationary plate  28 , a limiting portion  24  arranged to said seventh stationary plate  28  for limiting said clamping portion  24  to move, a second heating portion  26  arranged to said seventh stationary plate  28  for heating said second busbar. A teeth arranged to said clamping portion  27  meshes with a tooth  44  arranged in said limiting portion  24 . Said second heating portion  26  is connected with said electric control unit, said second heating portion  26  is movably connected to said seventh stationary plate  28  to adjust a distance between said second heating portion  26  and said second busbar, said second heating portion  26  heats said second busbar under control of said electric control unit, heating manner is a high frequency alternative magnetic heating. Said fifth stationary plate  22  is parallel to said sixth stationary plate  29 , said fifth stationary plate  22  comprises a sleeve, which has an interference fit with said fifth stationary plate  22  and a clearance fit with said first and second stationary shaft  11 , 12 . Said electric control unit connected to a power input is arranged to an inner side of a shell of said movable portion  2 , said electric control unit electrically connects to buttons of handles and said second heating portion  26 . Said second heating portion  26  works for a certain period of time after activating a heating button of a handle. When said clamping portion  26  is to clamp a busbar, firstly, operating said ball head  49  of said limiting portion  24  is to draw said ball head  49  away from a busbar so as to release a meshing relationship between said tooth  44  of said limiting portion  24  and said teeth groove of said clamping portion  27 , a limiting effect on said clamping portion  27  from said limiting portion  24  is released. Secondly, continue to keep said ball head  49  at a status of drawing, meanwhile manually adjust a distance between a clamping end of clamping portion  27  and a busbar so as to make said clamping end fit with said busbar, then release said ball head  49 , said tooth  44  rebuilds a meshing relationship with said teeth groove of sand clamping portion  27  as a result of a spring effect of a spring  42  arranged in said limiting portion  24 , that is to say that a limiting effect on said clamping portion  27  from said limiting portion  24  works, said clamping portion  27  is unmovable to keep a status of clamping a busbar. When said clamping portion  26  is to release a busbar, firstly, operating said ball head  49  of said limiting portion  24  is to draw said ball head  49  away from a busbar so as to release a meshing relationship between said tooth  44  of said limiting portion  24  and said teeth groove of said clamping portion  27 , a limiting effect on said clamping portion  27  from said limiting portion  24  is released. Secondly, continue to keep said ball head  49  at a status of drawing, meanwhile manually adjust a distance between a clamping end of clamping portion  27  and a busbar so as to make said clamping end away from said busbar, then release said ball head  49 , said tooth  44  rebuilds a meshing relationship with said teeth groove of sand clamping portion  27  as a result of a spring effect of a spring  42  arranged in said limiting portion  24 , that is to say that a limiting effect on said clamping portion  27  from said limiting portion  24  works, said clamping portion  27  is unmovable to keep a status of releasing a busbar. 
     Referring to  FIG. 3 , said first and second stationary shaft  11 , 12  of said stationary portion  1  and said movable shaft  13  penetrate through said movable portion  2 , an end of said movable shaft  13  is fixedly connected to a rotating shaft of said electric motor driving unit  15  of said stationary portion  1  by a coupler, said movable shaft  13  is driven to rotate around its axis by said electric motor driving unit  15 . A screw pair connecting is formed between a screw nut  21  arranged to said movable portion  2  and a screw portion arranged to said movable shaft  13 , a rotation of said movable shaft  13  drives said movable portion  2  to slide axially along said first and second stationary shaft  11 , 13  because said screw nut  21  is fastened to said fifth stationary plate  22  of said movable portion  2 , said movable portion  2  slides between said third and first stationary plate  19 , 14  of said stationary portion  1 . Said second stationary shaft  12  of said stationary portion  1  penetrates through said loading portion  3 , which slides and rotates between said fifth stationary plate  22  of said movable portion  2  and said first stationary plate  14  of said stationary portion  1 . Said first stationary shaft  11  has a clearance fit with a sleeve  23  arranged to said fifth and sixth stationary plate  22 , 29  of said movable portion  2 , said second stationary shaft  12  has a clearance fit with a sleeve  23  arranged to said fifth and sixth stationary plate  22 , 29  of said movable portion  2 , said movable shaft  13  has a clearance fit with a sleeve  23  arranged to said fifth and sixth stationary plate  22 , 29  of said movable portion  2 . Said movable portion  2  only has one axial freedom with respect to said stationary portion  1  because of an arrangement of said first and second stationary shaft  11 , 12 , that is to say that said movable portion  2  only slides axially to be good for busbars connecting correctly. 
     Referring to  FIG. 8  to  FIG. 10 , said limiting portion  24  comprises a base  47 , a straight pin  45  which has an interference fit with said base  47 , a limiting end  46  for partly inserting into said base  47 , a spring  42  for replacing said limiting end  46 , a side cover  41  fixedly connected to said limiting end  46  and ball head for operating. Said side cover is fastened to said base  47  by snap-fits, said limiting end  46  comprises a tooth  44  meshing with a teeth groove of said clamping portion  27 , said tooth  44  comprises a recess  48  matching with said straight pin  45 , operating said ball head  41  is to release a meshing between said tooth  44  and said teeth groove of said clamping portion  27 , spring  42  acting on said tooth  44  is to rebuild a meshing between said tooth  44  and said teeth groove, a matching between a recess arranged to said tooth  44  and a straight pin  45  is good for a correct meshing between said tooth  44  and said teeth groove. Said limiting end  46  limits a movement of said clamping portion  27  when said tooth  44  meshes with said teeth groove, said limiting end  46  does not limit a movement of said clamping portion  27  when said tooth  44  does not mesh with said teeth groove, said clamping portion  27  moves under outer force effecting. Said first stationary shaft  11  is fixedly connected to said first stationary plate  14  by a first straight pin, said second stationary shaft  12  is fixedly connected to said first stationary plate  14  by a second straight pin, said first stationary shaft  11  is fixedly connected to said second stationary plate  16  by a third straight pin, said second stationary shaft  12  is fixedly connected to said second stationary plate  16  by a fourth straight pin, see  FIG. 6 . Said movable shaft  13  is rotatably connected to said first stationary plate  14  by a sleeve. 
     Referring to  FIG. 5  and  FIG. 7 , said first stationary shaft  11  is fixedly connected to said third stationary plate  19  by a first spring pin, said second stationary shaft  12  is fixedly connected to said third stationary plate  19  by a second spring pin. Ends of said first and second shaft  11 , 12  are fixedly connected by said third stationary plate  19  to increase rigidity of said stationary portion  1 , such arrangement is good for said movable portion  2  to slide smooth along said first and second stationary shaft  11 , 12 . 
     Process of busbars connecting is described as follows. 
     Referring to  FIG. 11 , inserting said first positioning pillar  111  of said stationary portion  1  into a positioning hole preprocessed to a first busbar is to make said fourth stationary plate  110  of said stationary portion  1  fit with said first busbar. Sliding movable portion  1  to a first position where said movable portion  2  fits with said third stationary plate  19  of said stationary portion  1 . Operating said ball head  49  is to manually adjust said clamping portion  27  to make said clamping portion  27  move to a position to clamp a second busbar. Rotating said loading portion  3  to a position where is convenient to load connecting rods and keep said loading portion  3  at an open status. 
     Referring to  FIG. 12 , centrally placing connecting rods into said receiving cavity of said loading portion  3 . 
     Referring to  FIG. 13 , closing said movable plates of said loading portion  3 , said loading portion  3  keeps at a close status because of a magnetic element arranged to said movable plates. 
     Referring to  FIG. 14 , rotating said loading portion  3  with connecting rods already mounted is to align connecting rods with preprocessed holes of said first busbar. 
     Referring to  FIG. 15 , inserting said second positioning pillar  25  of said movable portion  2  into a positioning hole preprocessed to said second busbar is to make said seventh stationary plate  28  of said movable portion  2  fit with said second busbar. 
     Referring to  FIG. 16 , operating said ball head  49  is to manually adjust said clamping portion  27  to make said clamping portion  27  clamp a second busbar. Adjusting positions of said first and second heating portion  17 , 26  is to make heating surfaces fit with busbars. Simultaneously activating relative buttons of two handles is to make said first and second heating portion  17 , 26  simultaneously heat said busbar with a certain period of time. 
     Referring to  FIG. 17 , after heating process, a diameter of said preprocessed hole of a busbar is greater than a diameter of said connecting rod because of a heat expansion and contraction so that said connecting rods are convenient to mount to said preprocessed holes. Simultaneously activating relative buttons of two handles is to make said electric motor driving unit  15  work, said movable portion  2  moves from a first position to a second position so as to make said connecting rods insert into said first and second busbars. 
     Referring to  FIG. 18 , after said connecting rods are partly inserting into said first and second busbars, pushing said sliding block of said supporting portion  18  of said stationary portion  1  is to make said supporting end protrude from said stationary portion  1 , said loading portion  3  is kept at an open status to avoid said first and second busbars sticking said loading portion  3  when connecting busbars. 
     Referring to  FIG. 19 , continue activating relative buttons until said first and second busbars are totally fit with each other, that is to say that relative buttons are stopped activating when said movable portion  2  is at said second position. 
     Referring to  FIG. 20 , operating said ball head  49  is to manually adjust said clamping portion  27  to make said clamping portion  27  release said second busbar after busbars are cooled. Removing a tool for connecting busbars after mounting said connecting rods and connecting busbars successfully, see  FIG. 21 . 
     Embodiment 2 
     Electric motor driving unit  15  in embodiment 1 is replaced by a pneumatic motor driving unit, a compressing air releasing unit is simultaneously arranged to cool busbars after heating, air used for said pneumatic cylinder driving unit and said compressing air releasing unit is supplied through an air input  5 . 
     Referring to  FIG. 22 , a tool for connecting busbars comprises a pneumatic motor driving unit, an electric control unit connected with an electrical power input, a stationary portion  1  removably connected to a first busbar, a movable portion  2  removably connected to a second busbar, and a loading portion  3  for clamping connecting rods. Said connecting rod is configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars is connected by said connecting rod. Said movable portion  2  is movably connected to a first and second stationary shaft  11 , 12  of said stationary portion  1 , said movable portion  2  is connected to a movable shaft  13  by a screw pair, said movable portion  2  is fixedly connected to said pneumatic motor driving unit of said stationary portion  1 , said movable shaft  13  is driven to rotate around its axis by said pneumatic motor driving unit, said loading portion  3  is movably connected to said second stationary shaft  12  of said stationary portion  1  and slides between a body of said stationary portion  1  and a body of said movable portion  2 , said loading portion  3  rotates around said second stationary shaft  12 . Said air input  5  is connected to an outer compressing air source. 
     Embodiment 3 
     Electric motor driving unit  15  in embodiment 1 is replaced by an hydraulic motor driving unit, a compressing air releasing unit is simultaneously arranged to cool busbars after heating, air used for said compressing air releasing unit is supplied through an air input  5 . 
     Referring to  FIG. 22 , a tool for connecting busbars comprises an hydraulic motor driving unit and an electric control unit connected with an electrical power input, a stationary portion  1  removably connected to a first busbar, a movable portion  2  removably connected to a second busbar and a loading portion  3  for clamping connecting rods. Said connecting rod configured to mount to a pre-hole of a connecting surface of said first busbar and said second busbar, said first and second busbars being connected by said connecting rod. Said movable portion  2  is movably connected to a first and second stationary shaft  11 , 12  of said stationary portion  1 , said movable portion  2  is connected to a movable shaft  13  by a screw pair, said movable portion  2  is fixedly connected to said hydraulic motor driving unit of said stationary portion  1 , said movable shaft  13  is driven to rotate around its axis by said hydraulic motor driving unit, said loading portion  3  is movably connected to said second stationary shaft  12  of said stationary portion  1  and slides between a body of said stationary portion  1  and a body of said movable portion  2 , said loading portion  3  rotates around said second stationary shaft  12 . Said air input  5  is connected to an outer compressing air source.