the implementations of the disclosure are described in detail in conjunction with drawings , to make the objects , features and merits of the invention more obvious . details are illustrated in the description hereinafter to make the disclosure to be understood comprehensively . the invention may be implemented in other ways different from the description , and be extended by those skilled in the art without departing from the invention . the invention is not limited to the following embodiments . referring to fig1 , an apparatus for butting optical fiber cores is provided according to an embodiment of the invention . the apparatus includes the following components . a butting plate 1 includes multiple butting devices . each of the butting devices includes a butting hole 11 in its center . a connector 2 for butting optical fiber cores is fixed on the butting plate 1 . the connector for butting optical fiber cores includes several line connectors 21 parallel to each other and several cord connectors 22 parallel to each other . as shown in fig2 , each of the line connectors 21 include a first slide bar 211 , a first line fiber core connector 212 and a second line fiber core connector 213 . the first line fiber core connector 212 and the second line fiber core connector 213 both may slide along the first slide bar 211 . an input end and an output end of the first line fiber core connector 212 are connected through a connection optical fiber . an input end and an output end of the second line fiber core connector 213 are connected through a connection optical fiber . as shown in fig3 , each of the cord connectors 22 include a second slide bar 221 , a first cord fiber core connector 222 and a second cord fiber core connector 223 . the first cord fiber core connector 222 and the second cord fiber core connector 223 both may slide along the second slide bar 221 . the first cord fiber core connector 222 and the second cord fiber core connector 223 are connected through a connection optical fiber . manipulators 3 are configured to grip the fiber core connectors and drive movement of the fiber core connectors to move . preferably , according to an embodiment of the disclosure , the connection optical fiber is wrapped by a drag chain 23 , so that the connection optical fiber is fixed in an interior space of the drag chain 23 . thus interferences between optical fibers are avoided . it should be noted that , the fiber core connectors according to the embodiment of the disclosure may be the first cord fiber core connector 222 and the second cord fiber core connector 223 in the cord connector 22 , or may be the first line fiber core connector 212 and the second line fiber core connector 213 in the line connector 21 , which is not limited herein . when working , as shown in fig1 , the line connector 21 and the cord connector 22 are installed on both sides of the butting plate 1 in a manner that the installation directions of the first slide bar 211 and the second slide bar 221 are perpendicular to each other . in the following , the butting plate 1 of the apparatus for butting optical fiber cores , which is an optical fiber core butting plate with 24 * 24 butting devices , is taken as an example for description . it should be noted that , those skilled in the art may understand that the apparatus for butting optical fiber cores according to the embodiment of the disclosure is not limited to a butting apparatus including an optical fiber core butting plate with 24 * 24 butting devices , and may include a butting apparatus including an optical fiber core butting plate with a different number , i . e ., 48 * 48 or 96 * 96 , of butting devices , which depends on different situations . since the operating principle is basically the same , it is not repeated in the embodiment . each line connector corresponds to a respective row of butting holes in the optical fiber core butting plate with 24 * 24 butting devices . it should be noted that , the row and column are not absolute , as the selection of a coordinate system is not absolute . an original “ row ” may be viewed as a “ column ” from a different perspective . thus , those skilled in the art should understand that , the row and column are interchangeable according to the embodiment of the disclosure . the case that each line connector corresponds to a row of butting holes is taken as an example for illustration . in the example , each line connector can only move along the row corresponding to the line connector and can only be inserted into butting holes in the row corresponding to the line connector , i . e ., the butting holes are divided into multiple rows . each line connector includes a first slide bar , and a first line fiber core connector and a second line fiber core connector both of which may slide along the first slide bar . an input end and an output end of the first line fiber core connector are connected through a connection optical fiber . an input end and an output end of the second line fiber core connector are connected through a connection optical fiber . but the first line fiber core connector is not connected to the second line fiber core connector . when working , each of the line fiber core connectors may fix an end of an external line optical fiber core , and thus each line connector may fix two external line optical fiber cores . accordingly each line connector may correspond to two external line optical fibers . thus , in a case that the apparatus for butting optical fiber cores according to the embodiment of the disclosure includes an optical fiber core butting plate with 24 * 24 butting devices , there are 24 line connectors , and at most 48 external line optical fibers may be connected . the 48 external line optical fibers are provided at opposite sides of the butting plate , i . e ., a 01 ˜ a 24 and b 01 ˜ b 24 , as shown in fig4 . generally , a 01 ˜ a 24 are odd rows of line optical fibers , and b 01 ˜ b 24 are even rows of line optical fibers which is not limited herein . the multiple cord connectors ( c 01 - cn , where n is a positive integer no less than 2 ) in the apparatus for butting optical fiber cores according to the embodiment of the disclosure are provided on the other side of the butting plate , and the installation direction of the second slide bar in the cord connector is perpendicular to that of the first slide bar . the first cord fiber core connector and the second cord fiber core connector are connected through a connection optical fiber . thus , the first cord fiber core connector and the second cord fiber core connector in the cord connector may be driven , through controlling the manipulator , to be connected respectively to line fiber core connectors fixing different line optical fiber cores , so as to form an optical path between the line fiber core connectors fixing different line optical fiber cores , and the cord connector connected to the line fiber core connectors fixing different line optical fiber cores . thereby , transmission and exchange of data information between different line optical fibers is achieved . specific examples are used for illustration . for example , fig5 illustrates how to realize exchange between external line optical fibers ai and aj . the first cord fiber core connector in the cord connector c 01 is moved , through a manipulator , to a location on the butting plate where the first line fiber core connector of the line connector connected to the external line optical fiber ai is located , and thus the first cord fiber core connector butts the first line fiber core connector which fixes one end of the external line optical fiber ai core . meanwhile , the second cord fiber core connector of the cord connector c 01 is moved , through a manipulator , to a location on the butting plate where the first line fiber core connector of the line connector connected to the external line optical fiber aj is located , and thus the second cord fiber core connector butts the first line fiber core connector which fixes one end of the external line optical fiber aj core . the first cord fiber core connector and the second cord fiber core connector in the cord connector c 01 are connected through a connection optical fiber . thereby , an optical path may be formed among the external line optical fiber ai , the first line fiber core connector fixing one end of the external line optical fiber ai core , the first cord fiber core connector in the cord connector c 01 , the second cord fiber core connector in the cord connector c 01 , the first line fiber core connector fixing one end of the external line optical fiber aj core , and the external line optical fiber aj , and butting and exchange of data information between the external line optical fiber ai and the external line optical fiber aj is achieved . here , both i and j are any integer between 1 and 24 , inclusive , and i is not equal to j . similarly , fig6 illustrates how to realize the exchange between external line optical fibers bi and bj . the external line optical fiber bi corresponds to a line connector installed on the i - th row of butting holes of the butting plate , and is connected to the input end of the second line fiber core connector of the line connector . the external line optical fiber bj corresponds to a line connector installed on the j - th row of butting holes of the butting plate , and is connected to the input end of the second line fiber core connector of the line connector . thus , the first cord fiber core connector of the cord connector cn is moved , through a manipulator , to a location on the butting plate , where the second line fiber core connector of the line connector connected to the external line optical fiber bi is located . thus the first cord fiber core connector butts the second line fiber core connector which fixes one end of the external line optical fiber bi core . meanwhile , the second cord fiber core connector of the cord connector cn is moved to a location on the butting plate where the second line fiber core connector of the line connector connected to the external line optical fiber bj is located . thus the second cord fiber core connector butts the second line fiber core connector which fixed one end of the external line optical fiber bj core . the first cord fiber core connector and the second cord fiber core connector of the cord connector cn are connected through a connection optical fiber . thereby , an optical path may be formed among the external line optical fiber bi , the second line fiber core connector fixing one end of the external line optical fiber bi core , the first cord fiber core connector of the cord connector cn , the second cord fiber core connector of the cord connector cn , the second line fiber core connector fixing one end of the external line optical fiber bj core , and the external line optical fiber bj , and butting and exchange of data information between the external line optical fiber bi and the external line optical fiber bj is achieved . here , both i and j are any integer between 1 and 24 , inclusive , and i is not equal to j . it may be seen that , in the apparatus for butting optical fiber cores according to the embodiment of the disclosure , the first line fiber core connector or the second line fiber core connector which fixes the external line optical fiber core are gripped , by the manipulator , to move on the butting plate . and the first cord fiber core connector and the second cord fiber core connector of the cord connector are gripped , by the manipulator , to move on the butting plate . thus a cord connector butts a first line fiber core connector or a second line fiber core connector which fixes respectively two different external line optical fiber cores , and automatic butting for two external line optical fiber cores are realized . the operation is simple , manual intervention is greatly reduced , a large amount of manpower and materials are saved , and work efficiency is improved . further , in the apparatus for butting optical fiber cores according to the embodiment of the disclosure , in the direction perpendicular to the extension direction of the second slide bar of the cord connector , the butting between any two of multiple different line optical fibers is realized with one cord connector , thus usage of cord optical fibers is greatly reduced , and cost is decreased . in additional , fig7 illustrates how to realize the exchange between external line optical fibers ai and bj . the external line optical fiber ai corresponds to a line connector installed on the i - th row of butting holes of the butting plate , and is connected to the input end of the first line fiber core connector of the line connector . the external line optical fiber bj corresponds to a line connector installed on the j - th row of butting holes of the butting plate , and is connected to the input end of the second line fiber core connector of the line connector . thus , the first cord fiber core connector of the cord connector cm ( m is a positive integer greater than 1 and less than n ) is moved along the column direction , by controlling a manipulator , and the first line fiber core connector fixing one end of the external line optical fiber ai core is moved along the row direction , by controlling a manipulator . thus , the first cord fiber core connector of the cord connector cm butts the first line fiber core connector fixing one end of the external line optical fiber ai core . meanwhile , the second cord fiber core connector of the cord connector ck ( k is a positive integer greater than 1 and less than n , and not equal to m ) is moved along the column direction , by controlling a manipulator , and the second line fiber core connector fixing one end of the external line optical fiber bj core is moved along the row direction , by controlling a manipulator . thus , the second cord fiber core connector of the cord connector ck butts the second line fiber core connector fixing one end of the external line optical fiber bj core . then , the second cord fiber core connector of the cord connector cm and the first cord fiber core connector of the cord connector ck are connected in advance through a tail fiber on the butting plate . hence , an optical path may be formed among the external line optical fiber ai , the first line fiber core connector fixing one end of the external line optical fiber ai core , the first cord fiber core connector of the cord connector cm , the second cord fiber core connector of the cord connector cm , the tail fiber connecting the second cord fiber core connector of the cord connector cm and the first cord fiber core connector of the cord connector ck , the first cord fiber core connector of the cord connector ck , the second cord fiber core connector of the cord connector ck , the second line fiber core connector fixing one end of the external line optical fiber bj core , and the external line optical fiber bj , and butting and exchange of data information between the external line optical fiber ai and the external line optical fiber bj is achieved . here , both i and j are any integer between 1 and 24 , inclusive , and i is not equal to j . in conclusion , in the apparatus for butting optical fiber cores according to the embodiment of the disclosure , in the direction perpendicular to the extension direction of the second slide bar of the cord connector , the butting between any two ( ai and aj , or , bi and bj ) of multiple different line optical fibers is realized with one cord connector , thus usage of cord optical fibers is greatly reduced , and cost is decreased . in addition , in a case that the connector for butting optical fiber cores according to the embodiment of the disclosure includes 24 cord connectors , the butting between 12 groups of line optical fibers arbitrarily divided among a 01 ˜ a 24 and automatic butting between 12 groups of line optical fibers arbitrarily divided among b 01 ˜ b 24 can be achieved . in addition , in a case that c 01 - c 12 and c 13 - c 24 of the 24 cord connectors on the butting plate are connected respectively through a tail fiber , automatic butting for 24 groups of external line optical fibers consisting of the external line optical fibers a 01 ˜ a 24 and the external line optical fibers b 01 ˜ b 24 may be realized , i . e ., automatic full - butting for all connected external line optical fibers may be realized . it should be noted that , c 01 - c 12 are not required to correspond to c 13 - c 24 strictly , so long as one of the two cord connectors to be butted is located in the region where c 01 - c 12 are located , and the other one is located in the region where c 13 - c 24 are located . a 01 ˜ a 24 are not required to correspond to b 01 ˜ b 24 strictly either , so long as one of the two external line optical fibers for butting is selected from the external line optical fibers a 01 ˜ a 24 , and the other one is selected from the external line optical fibers b 01 ˜ b 24 . it should be also noted that , according to an embodiment of the disclosure , to avoid signal interference between the external line optical fiber ai and the external line optical fiber bi when automatic full - exchange is performed , i . e ., automatic butting for the 24 groups of external line optical fibers consisting of the external line optical fibers a 01 ˜ a 24 and the external line optical fibers b 01 ˜ b 24 is realized , each of the first line fiber core connectors connected to the external line optical fibers a 01 ˜ a 24 can only move in half of the region on a side of the butting plate close to the external line optical fibers a 01 ˜ a 24 , and each of the second line fiber core connectors connected to the external line optical fibers b 01 ˜ b 24 can only move in half of the region on a side of the butting plate close to the external line optical fibers b 01 ˜ b 24 . in conclusion , in the apparatus for butting optical fiber cores according to the embodiment of the disclosure , automatic butting between different line optical fibers in an optical fiber network may be realized , and automatic full - butting between different line optical fibers in the optical fiber network may be also realized . the operation is simple , a large amount of manpower and materials are saved , and work efficiency is improved . the basic structure of the connector for butting optical fiber cores provided according to the embodiment of the disclosure is similar to that in the first embodiment . differences lie in that , as shown in fig8 , the butting device further includes : multiple arc - shaped holes 12 distributed around the circumference of each of the butting holes 11 , where two ends of each of the arc - shaped holes 12 get far away from the butting holes 11 ; and multiple embossments 13 which are provided on an inner wall of each of the butting holes 11 , along radial directions of the arc - shaped holes 12 , and opposite to the arc - shaped holes 12 , where each of the embossments 13 corresponds to a respective one of the arc - shaped holes 12 . preferably , the arc - shaped holes 12 are evenly distributed around the circumference of each of the butting holes 11 , and more preferably , the number of the arc - shaped holes 12 is 4 . the disclosure is not limited . the portion of the line fiber core connector which is inserted into the butting hole , and the portion of the cord fiber core connector which is inserted into the butting hole , have the same diameter as the butting hole . thus , in the technical solution according to the embodiment of the disclosure , when the line fiber core connector is inserted into the butting hole and the cord fiber core connector is inserted into the butting hole , the embossments will squeeze , along radial directions of the arc - shaped holes 12 , the line fiber core connector and the cord fiber core connector inserted into the butting hole , to increase contact pressure between the embossments and any portion inserted into the butting hole . thus stability between the line fiber core connector and the cord fiber core connector is improved when optical signal is exchanged through the butting hole . it should be noted that , the butting plate according to the embodiment of the disclosure is proposed mainly for the butting of optical fiber cores in the optical fiber communication network , and may be made of materials such as stainless steel , aluminum alloy , or glass , which are sturdy and durable , and the processing difficulty is taken into account . in addition , for different requirements , butting plates with different amounts of butting holes may be customized based on actual situations in specific implementations . the basic structure of the apparatus for butting optical fiber cores provided according to the embodiment of the disclosure is similar to the structure in the first embodiment . differences lie in that , as shown in fig9 , the fiber core connector includes : a connecting portion 91 ; a fixing portion 92 , where a cavity 921 is provided in the fixing portion 92 and passes through the fixing portion 92 from left side to right side of the fixing portion 92 , and two through - holes 922 are provided side - by - side at the bottom of the cavity 921 , and the through - holes 922 are exposed from the fiber core connector ; two optical fiber core connecting flanges 93 , where one end of each of the optical fiber core connecting flanges 93 is fixed in a through - hole 922 , the other end is provided with a second cylinder portion 933 for fixing an external optical fiber core , and at least one optical fiber core connecting flange 93 is provided with a stepped hole 931 inside . specifically , each of the optical fiber core connecting flanges 93 includes a first cylinder portion 932 and a second cylinder portion 933 . the first cylinder portion 932 is fixed in a through - hole 922 , and a diameter of the first cylinder portion 932 is the same as a diameter of the through - hole 922 and is greater than a diameter of the second cylinder portion 933 . the first cylinder portion 932 and the second cylinder portion 933 may be manufactured integrally , or may be manufactured separately and then combined . the disclosure is not limited herein . it should be noted that , the fiber core connector according to the embodiment of the disclosure may be the first cord fiber core connector or the second cord fiber core connector of the cord connector , or may be the first line fiber core connector or the second line fiber core connector of the line connector , and the disclosure is not limited herein . in specific implementations , the core of a connection optical fiber , which passes through the drag chain 3 , enters the through - cavity 921 from a side of the fiber core connector , and is inserted into a connecting flange 93 through a part of the stepped hole 931 corresponding to the first cylinder portion 932 of the connecting flange 93 , and exits from another part of the stepped hole 931 corresponding to the second cylinder portion 933 of the connecting flange 93 . the second cylinder portion 933 is configured to fix the fiber core of the connection optical fiber . during butting , the fiber core connector moves down , and the second cylinder portion 933 of the connecting flange 93 is inserted into a butting hole , so that the optical fiber core fixed by the second cylinder portion 933 of the cord fiber core connector ( i . e ., the first cord fiber core connector or the second cord fiber core connector ) butts the optical fiber core fixed by the second cylinder portion 933 of the line fiber core connector ( i . e ., the first line fiber core connector or the second line fiber core connector ). those skilled in the art should understand that , according to the embodiment of the disclosure , the size of the cavity 921 may be adjusted based on actual requirements . further , the shape of the through - holes 922 may be a cylinder , and may be other shapes according to other embodiments . the disclosure is not limited herein . based on the second embodiment , in order to make an external device grip the connecting portion 91 of the fiber core connector better , to drive the fiber core connector to move , the connecting portion 91 of the fiber core connector according to the embodiment of the disclosure includes an upper part and a lower part , as shown in fig1 . in the direction perpendicular to the passing - through direction of the cavity 921 , a cross section area of the upper part of the connecting portion 91 is larger than a cross section area of the lower part of the connecting portion 91 , thus a groove shape is formed by the upper part of the connecting portion 91 , the lower part of the connecting portion 91 , and the fixing portion 92 . thus the external device may conveniently grip the fiber core connector to move up and down by means of the groove formed through the lower part of the connecting portion 91 . the basic structure of the apparatus for butting optical fiber cores provided according to the embodiment of the disclosure is similar to the structure in the first embodiment . differences lie in that , as shown in fig1 , the manipulator 3 includes a first transmission gear 310 , and a plug 320 which is homocentric with the first transmission gear 310 and is embedded partly in the first transmission gear 310 . internal threads are provided in the joint portion of the first transmission gear 310 to join the plug 320 , and external threads matching the internal threads of the first transmission gear 310 are provided in the corresponding portion of the plug 320 , i . e ., an upper part of the plug 320 forms a screw structure . the first transmission gear 310 and the plug 320 cooperate to each other to form a thread - screw structure . a grip portion 321 is provided in a lower part of the plug 320 . the grip portion 321 is configured to grip the fiber core connector . those skilled in the art should understand that , in the embodiment , the connection between the first transmission gear 310 and the plug 320 through the thread and screw is just a preferable mode among multiple connection modes , and the disclosure is not limited herein , as long as a transverse rotation of the first transmission gear 310 may drive the plug 320 to move up and down . when rotating transversely , the first transmission gear 310 drives the plug 320 to move up and down through the thread connection , i . e ., the plug 320 has a displacement relative to the first transmission gear 310 , so as to grip the fiber core connector to move up and down , and insert the fiber core connector into the butting hole of the butting plate , or pull the fiber core connector out of the butting hole . to better control the plug 320 based on the fourth embodiment to move up and down , the position of the first transmission gear 310 has to be unchanged , i . e ., only when the position of the first transmission gear 310 is relatively fixed , the plug 320 may be driven to relatively move up and down through a screw joint structure of the first transmission gear 310 and the plug 320 . in view of this , as shown in fig1 , in an apparatus for butting optical fiber cores according to the embodiment of the disclosure , the manipulator 3 further includes two bearings 330 which are provided on a top surface and a bottom surface of the first transmission gear 310 and are configured to fix the first transmission gear 310 . when being externally driven to rotate transversely , the first transmission gear 310 can only rotate transversely around the center of the first transmission gear 310 at its original position due to fixation of the two bearings 330 which are configured to fix the first transmission gear 310 . meanwhile , since the first transmission gear 310 and the plug 320 are connected through threads , the plug 320 can only move up and down relative to the butting hole under the function of the thread structure when the first transmission gear 310 rotates transversely . thus it ensure that the manipulator 3 only grips the fiber core connector up and down . then , an external driving device drives the manipulator 3 and the fiber core plug to move along the first slide bar or along the second slide bar in the direction parallel to the first slide bar or the second slide bar . those skilled in the art should understand that , according to the embodiment of the disclosure , the bearings 330 which are configured to fix the first transmission gear 310 are preferable , but the disclosure is not limited herein , as long as the first transmission gear 310 may be fixed and the transverse rotation of the first transmission gear 310 is not influenced . based on forgoing embodiments , as shown in fig1 , in an apparatus for butting optical fiber cores according to the embodiment of the disclosure , the manipulator 3 further includes a driving portion 35 configured to drive the first transmission gear 310 to rotate transversely . the driving portion 35 includes a motor 351 , a second transmission gear 352 and a power output portion 353 . the second transmission gear 352 engages with the first transmission gear 310 , and is fixedly connected to the power output portion 353 of the motor 351 , so that the motor 351 may drive the second transmission gear 352 to rotate transversely , and in turn drive the first transmission gear 310 to rotate transversely . preferably , the motor 351 according to the embodiment of the disclosure is a stepper motor . in a specific operation , automatic rotation of the motor is passed to the second transmission gear 352 through the power output portion 353 , thus the second transmission gear 352 is driven to rotate transversely with the motor . since the second transmission gear 352 engages with the first transmission gear 310 , the first transmission gear 310 rotates transversely in a direction opposite to that of the second transmission gear 352 when the second transmission gear 352 rotates transversely . since the first transmission gear 310 and the plug 320 are connected through the thread - screw structure , the plug 320 will move up and down when the first transmission gear 310 rotates transversely . thus , the connecting portion which grips the fiber core connector may drive the fiber core connector to move in the butting hole in the plug and pull mode . according to the embodiment of the disclosure , the grip portion 321 is made of a ductile material , so that when the grip portion 321 moves downwards to the upper part of the connecting portion which serves as a hamper , two sidewalls of the grip portion 321 tilt towards two sides along directions perpendicular to planes where the two sidewalls locate . then the grip portion 321 moves to the lower part of the connecting portion across the upper part of the connecting portion . since a cross section area of the lower part of the connecting portion is smaller than that of the upper part of the connecting portion , the grip portion 321 , which has crossed the upper part of the connecting portion , locks a groove formed between the upper part of the connecting portion and the lower part of the connecting portion , to grip the connecting portion . in conclusion , in the apparatus for butting optical fiber cores according to the embodiment of the disclosure , the first cord fiber core connector and the second cord fiber core connector of the cord connector are gripped by a manipulator to move to output ends of the first line fiber core connectors ( or the second line fiber core connectors ) connected to different line fiber cores , and then the first cord fiber core connector and the second cord fiber core connector of the cord connector butt output ends of the first line fiber core connectors ( or the second line fiber core connectors ) connected to different line fiber cores . thus an optical path between different lines is formed based on the first line fiber core connectors ( or the second line fiber core connectors ) connected to different line fiber cores and the butted cord connectors . automatic butting for different line optical fibers in the optical fiber network is realized , the operation is simple , manual intervention is greatly reduced , a large amount of manpower and materials are saved , and work efficiency is improved . the embodiments of the disclosure are described in a progressive manner , each embodiment focuses on differences from other embodiments , and for the same or similar parts , other embodiments may be referred to . the forgoing description of the embodiments of the disclosure , allows those skilled in the art to implement or use the disclosure . a variety of modifications to the embodiments are apparent for those skilled in the art , and the general principles defined in the disclosure may be implemented in other embodiments without departing from the spirit and scope of the disclosure . hence , the disclosure is not limited to the embodiments shown in the disclosure , but conforms to a widest scope consistent with the principles and novel features in the disclosure .