CN107634718B - Small-size modularization 1500V solar module terminal box - Google Patents
Small-size modularization 1500V solar module terminal box Download PDFInfo
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- CN107634718B CN107634718B CN201711029662.1A CN201711029662A CN107634718B CN 107634718 B CN107634718 B CN 107634718B CN 201711029662 A CN201711029662 A CN 201711029662A CN 107634718 B CN107634718 B CN 107634718B
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- 238000003466 welding Methods 0.000 claims abstract description 312
- 239000002184 metal Substances 0.000 claims abstract description 100
- 238000009434 installation Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 95
- 238000003825 pressing Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 210000004692 intercellular junction Anatomy 0.000 description 2
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- 229910000679 solder Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a small modularized 1500V solar cell module junction box which is arranged in a modularized manner and comprises a box body, a box cover, a metal sheet group, a diode and a cable; the first clamping block, the second clamping block, the third clamping block and the fourth clamping block are arranged on the box body, two sides of the bottom of the box body are respectively provided with a cable connector, the inner side of each cable connector is provided with a cable installation through hole, the first fixing part, the second fixing part, the third fixing part and the fourth fixing part of the metal sheet group are clamped and fixed in the box body, and the first clamping block, the second clamping block, the third clamping block and the fourth clamping block in the box body are respectively fixed with a first positioning hole, a second positioning hole, a third positioning hole and a fourth positioning hole in the metal sheet group in interference fit; the two cables respectively penetrate through the two cable interfaces and are fixed on the cable welding lug through resistance welding; the cable is fixed in the cable interface through a cable fixing block; the invention reduces the volume of the junction box, is convenient to assemble and reduces the cost.
Description
Technical Field
The invention relates to a junction box, in particular to a small modularized 1500V solar cell module junction box.
Background
Along with the increasing popularity of solar power generation, junction boxes closely related to the application of the solar power generation are continuously updated, solar power generation adopts a plurality of groups of solar cell modules arranged in a matrix form to convert sunlight into electric energy, each group of solar cell modules is connected with a photovoltaic cell junction box, and the junction boxes are connected with other parts of a solar power generation system. At present, a photovoltaic cell junction box is a mature product and generally comprises a box body and a box cover, wherein metal sheets are arranged in the box body and are connected through diodes; the side wall of the box body is provided with a cable interface, and a bus bar connecting device is also arranged in the box body.
The diode is a key component in the junction box of the photovoltaic cell, and the fixation of the diode is particularly important and is the process with the greatest difficulty. In the prior art, the most common method is to solder the diode on the conductive sheet, which is troublesome to operate, time-consuming and high in cost, brings much inconvenience when in use, and reduces production efficiency.
Disclosure of Invention
The invention provides a small modularized 1500V solar cell module junction box aiming at the problems, which is modularized, reduces the volume of the junction box, is convenient to assemble and reduces the cost.
The specific technical scheme is as follows:
a small modularized 1500V solar cell module junction box comprises a box body, a box cover, a metal sheet group, a diode and a cable;
the box body is provided with a first clamping block, a second clamping block, a third clamping block and a fourth clamping block, two sides of the bottom of the box body are respectively provided with a cable interface, and the inner side of the cable interface is provided with a cable installation through hole;
the metal sheet group sequentially comprises a first metal sheet, a second metal sheet, a third metal sheet and a fourth metal sheet from left to right;
the first metal sheet comprises a first fixing part, a first diode fixing part and a first cable fixing part which are of an integrated structure, wherein an avoidance hole, a diode welding lug and a first positioning hole are formed in the first diode fixing part, the avoidance hole is positioned on the right side of the diode welding lug, the first positioning hole is positioned below the avoidance hole, two clamping plates are vertically upwards arranged on the right side wall of the first diode fixing part, a diode clamping groove is formed between the two clamping plates, and the first cable fixing part is provided with a cable welding lug;
the second metal sheet comprises a second fixing part, a second diode upper fixing part and a second diode lower fixing part which are of an integrated structure, wherein the second diode upper fixing part is positioned at the right upper part of the second diode lower fixing part, an avoidance hole, a diode welding lug and a second positioning hole are formed in the second diode upper fixing part, the avoidance hole is positioned at the left side of the diode welding lug, the second positioning hole is positioned below the avoidance hole, an avoidance hole and a diode welding lug are formed in the second diode lower fixing part, the avoidance hole is positioned at the right side of the diode welding lug, and two clamping plates are respectively arranged on the left side wall of the second diode upper fixing part and the right side wall of the second diode lower fixing part;
The third metal sheet comprises a third fixing part, a third diode upper fixing part and a third diode lower fixing part which are of an integrated structure, wherein the third diode upper fixing part is positioned at the left upper part of the third diode lower fixing part, an avoidance hole, a diode welding lug and a third positioning hole are formed in the third diode upper fixing part, the avoidance hole is positioned at the right side of the diode welding lug, the third positioning hole is positioned below the avoidance hole, the avoidance hole and the diode welding lug are formed in the third diode lower fixing part, the avoidance hole is positioned at the left side of the diode welding lug, and two clamping plates are respectively arranged on the right side wall of the third diode upper fixing part and the left side wall of the third diode lower fixing part;
the fourth metal sheet comprises a fourth fixing part, a fourth diode fixing part and a fourth cable fixing part which are of an integrated structure, an avoidance hole, a diode welding lug and a fourth positioning hole are formed in the fourth diode fixing part, the avoidance hole is positioned on the left side of the diode welding lug, the fourth positioning hole is positioned below the avoidance hole, two clamping plates are vertically upwards arranged on the left side wall of the fourth diode fixing part, a diode clamping groove is formed between the two clamping plates, and a cable welding lug is arranged on the fourth cable fixing part;
The number of the diodes is three, and the three diodes are respectively fixed between a first diode fixing part of the first metal sheet and a second diode upper fixing part of the second metal sheet, between a second diode lower fixing part of the second metal sheet and a third diode lower fixing part of the third metal sheet and between a third diode upper fixing part of the third metal sheet and a fourth diode fixing part of the fourth metal sheet;
the lead wire of the diode passes through a diode clamping groove formed between the two corresponding clamping plates and is fixed on the diode welding lug by resistance welding;
the first fixing part, the second fixing part, the third fixing part and the fourth fixing part of the metal sheet group are clamped and fixed in the box body, and the first clamping block, the second clamping block, the third clamping block and the fourth clamping block in the box body are respectively fixed with the first positioning hole, the second positioning hole, the third positioning hole and the fourth positioning hole in the metal sheet group in interference fit;
the two cables respectively penetrate through the two cable interfaces and are fixed on the cable welding lug through resistance welding;
the cable is fixed in the cable interface through a cable fixing block;
the box cover is clamped and fixed on the box body.
The small modularized 1500V solar cell module junction box comprises a first clamping block, a second clamping block, a third clamping block and a fourth clamping block which are of oval structures.
The assembly method of the small modularized 1500V solar cell module junction box is as follows:
(1) Welding and fixing three diodes between two adjacent metal sheets through diode welding equipment respectively to form a metal sheet module;
(2) The metal sheet module is clamped and fixed in the box body;
(3) Removing an insulating layer with the length of 0.8-1.5cm at the front end of the cable, combining multi-strand wires in the cable into a whole, respectively penetrating through two cable interfaces, pre-fixing the two strands of wires through a cable fixing block, and then welding and fixing the two strands of wires on a cable welding lug through cable welding equipment;
(4) The box cover is clamped and fixed on the box body;
wherein:
the diode welding equipment in the step (1) comprises a first rack, a first welding platform, a first welding tool and a diode welding mechanism;
the first welding platform is arranged at the bottom of the first frame, a first positioning insert block and two second positioning insert blocks are arranged on the first welding platform, the top surface of the first positioning insert block is of an isosceles trapezoid structure, the second positioning insert block is of a cylinder structure, and the first positioning insert block is positioned on a middle vertical line of a connecting line between the two second positioning insert blocks;
the first welding tool comprises a first tool main body, wherein the upper side of the first tool main body is a plugging side, the opposite lower side of the first tool main body is a gripping side, a handle is arranged on the gripping side of the first tool main body, a first plugging groove, a second plugging groove and a third plugging groove are arranged on the plugging side of the first tool main body, the first plugging groove and the third plugging groove are symmetrically arranged on two sides of the second plugging groove, the first plugging groove and the third plugging groove are identical in shape and size and are in clearance fit with the first positioning plug, and the depth of the second plugging groove is smaller than that of the first plugging groove and in clearance fit with the first positioning plug; the first fixture body is provided with a first welding station, a second welding station and a third welding station which are arranged on the gripping side in a mutually flush manner, the second welding station is positioned between the first welding station and the third welding station and positioned on the plugging side, the first welding station, the second welding station and the third welding station all comprise diode positioning channels and two second positioning channels, and the two second positioning channels are respectively positioned on two sides of the diode positioning channels; the first tooling main body is also provided with four third positioning inserting blocks and three fourth positioning inserting blocks, the four third positioning inserting blocks are respectively positioned at the upper sides of four second positioning channels in the first welding station and the third welding station, the three fourth positioning inserting blocks are positioned at the lower sides of the first welding station and the third welding station, the third positioning inserting blocks are used for inserting and fixing metal sheets to be welded, the fourth positioning inserting blocks are used for separating the metal sheets to be welded, the second positioning channel is used for being matched with the two second positioning inserting blocks to realize positioning, and the first inserting groove, the second inserting groove and the third inserting groove are used for being matched with the first positioning inserting blocks to realize positioning;
The diode welding mechanism comprises a first air cylinder, a second air cylinder, a first resistance welding machine, a first transmission block, a second transmission block, a first pressure welding block, a second pressure welding block, a first spring pressure head and a second spring pressure head; the first cylinder and the second cylinder are fixed at the top of the first frame, the first transmission block and the second transmission block are respectively fixed on push rods of the first cylinder and the second cylinder, the first pressure welding block and the second pressure welding block are respectively fixed at the bottoms of the first transmission block and the second transmission block, the first spring pressure head and the first upper electrode of the first resistance welding machine are arranged at the bottom of the first pressure welding block, the first upper electrode is positioned at the outer side of the first spring pressure head, the second spring pressure head and the second upper electrode of the first resistance welding machine are arranged at the bottom of the second pressure welding block, and the second upper electrode is positioned at the outer side of the second spring pressure head;
the first welding fixture is positioned and placed on the first welding platform, the first spring pressing head and the second spring pressing head are used for pressing a diode to be welded, and the first upper electrode and the second upper electrode are used for welding leads on two sides of the diode on corresponding metal sheets;
the first transmission block and the second transmission block are respectively connected with the first frame through a first transmission shaft and a second transmission shaft;
The first spring pressure head and the second spring pressure head comprise pressure heads, springs and connecting columns, the connecting columns are fixed on the pressure heads, the springs are coated on the outer parts of the connecting columns, one ends of the springs are fixedly connected with the pressure heads, the other ends of the springs are fixed in first grooves of the first pressure welding blocks or the second pressure welding blocks, the connecting columns penetrate through the first grooves and are movably arranged in the second grooves, and the springs are compression springs;
the first welding platform is internally provided with a first base plate, a first lower electrode and a second lower electrode are arranged in the first base plate, the first lower electrode and the second lower electrode are respectively positioned below the first upper electrode and the second upper electrode, the first base plate is the same as the first upper electrode and the second upper electrode in material, a positive electrode power supply of the first resistance welding machine is respectively communicated with the first upper electrode and the second upper electrode, and a negative electrode power supply of the first resistance welding machine is connected with the first lower electrode and the second lower electrode;
when the LED lamp is used, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are fixed through the third positioning plug respectively, and three diodes are placed into the three diode positioning channels respectively; when the diode of the first station is welded, the second positioning plug is inserted into two second positioning channels of the first welding station, meanwhile, the first positioning plug is inserted into the first plug groove, the first cylinder, the second cylinder and the first resistance welder are started, the first cylinder and the second cylinder are pressed on the diode to be fixed firstly by the first spring pressing head and the second spring pressing head in the pressing process, and the two leads are welded and fixed on corresponding metal sheets by the first upper electrode and the second upper electrode; when the diode of the second station is welded, the second positioning plug blocks are inserted into two second positioning channels of the second welding station, and meanwhile, the first positioning plug blocks are inserted into the second plug grooves, and welding and fixing are carried out through the steps; when the diode of the third station is welded, the second positioning plug blocks are inserted into two second positioning channels of the third welding station, and meanwhile, the first positioning plug blocks are inserted into the third plug grooves, and the welding and fixing are carried out through the steps;
The cable welding equipment in the step (3) comprises a second rack, a second welding platform, a second backing plate, a second welding tool and a cable welding mechanism;
the second welding platform is fixed on the second frame, the second base plate is fixed on the second welding platform, and a third lower electrode and a fourth lower electrode are arranged on the second base plate;
the second welding fixture comprises a second fixture body, wherein a junction box fixing groove is formed in the second fixture body, the junction box fixing groove is in clearance fit with the junction box, two cable locating grooves are further formed in the second fixture body and are communicated with cable interface positions of the junction box fixing grooves, a cable clamping block is arranged in each cable interface position of each junction box fixing groove and is located at the inner side of the corresponding cable locating groove, the second welding fixture is fixed on a second welding platform, and a third lower electrode and a fourth lower electrode penetrate through the second fixture body and are located at the inner sides of the two cable clamping blocks respectively;
the cable welding mechanism comprises a second resistance welding machine, a fixing platform, a first cable welding mechanism and a second cable welding mechanism, wherein the fixing platform is fixed on the second rack, and the first cable welding mechanism and the second cable welding mechanism are fixed on the fixing platform in a mirror image manner;
The first cable welding mechanism comprises a first supporting seat, a third air cylinder, a first transmission plate, a third transmission shaft, a third pressure welding block and a third upper electrode, wherein the first supporting seat is fixed on a fixed platform, a first adjusting groove is formed in the first supporting seat, the third air cylinder is fixed at the top of the first supporting seat, a push rod of the third air cylinder penetrates through the first supporting seat to be connected with the first transmission plate arranged in the first adjusting groove, the number of the third transmission shafts is two, the two third transmission shafts are mutually parallel and are fixed on the first transmission plate and are linked with the first transmission plate, the top end of the third transmission shaft penetrates through the top end of the first supporting seat to be exposed outside, the bottom end of the third transmission shaft penetrates through the first supporting seat to be fixedly connected with the third pressure welding block, and the third upper electrode is fixed at the bottom of the third pressure welding block;
the second cable welding mechanism comprises a second supporting seat, a fourth air cylinder, a second transmission plate, a fourth transmission shaft, a fourth pressure welding block and a fourth upper electrode, wherein the second supporting seat is fixed on a fixed platform, a second adjusting groove is formed in the second supporting seat, the fourth air cylinder is fixed at the top of the second supporting seat, a push rod of the fourth air cylinder penetrates through the second supporting seat to be connected with the second transmission plate arranged in the second adjusting groove, the number of the fourth transmission shafts is two, the two fourth transmission shafts are mutually parallel and are fixed on the second transmission plate and are linked with the second transmission plate, the top end of the fourth transmission shaft penetrates through the top end of the second supporting seat to be exposed outside, the bottom end of the fourth transmission shaft penetrates through the second supporting seat to be fixedly connected with the fourth pressure welding block, and the fourth upper electrode is fixed at the bottom of the fourth pressure welding block;
The positive electrode power supply of the second resistance welding machine is respectively connected with the third upper electrode and the fourth upper electrode, and the negative electrode power supply of the second resistance welding machine is respectively connected with the third lower electrode and the fourth lower electrode;
the tops of the third transmission shaft and the fourth transmission shaft are respectively provided with a limiting block;
the second welding tool is locked and fixed on the second welding platform through bolts penetrating through the second base plate;
when the cable welding device is used, the box body of the assembled metal sheet module is placed in the junction box fixing groove, a cable passes through the cable interface and is pre-fixed through the cable fixing block, the front end of the cable is clamped on the cable clamping block, the rear part of the cable is placed in the cable positioning groove, the third cylinder, the fourth cylinder and the second resistance welding machine are started, and two cables are welded and fixed on corresponding cable welding convex blocks through the third upper electrode and the fourth upper electrode.
The beneficial effects of the invention are as follows:
the invention adopts the modularized arrangement, reduces the volume of the junction box, and is convenient to assemble and reduces the cost by the cooperation of the diode welding equipment and the cable welding equipment; convenient operation and improved production efficiency.
Drawings
Fig. 1 is a structural view of an unassembled box cover of the present invention.
Fig. 2 is a structural view of the cap of the present invention.
FIG. 3 is a block diagram of a sheet metal set of the present invention.
Fig. 4 is a structural view of a diode welding apparatus of the present invention.
Fig. 5 is a structural diagram of a first welding fixture according to the present invention.
Fig. 6 is a structural diagram of the first welding tool of the present invention after welding.
Fig. 7 is an assembly view of a first welding station of the present invention.
Fig. 8 is an assembly view of a second welding station of the present invention.
Fig. 9 is an assembly view of a third welding station of the present invention.
Fig. 10 is a cross-sectional view of a first spring ram of the present invention.
Fig. 11 is a structural view of the cable welding apparatus of the present invention.
Fig. 12 is a structural diagram of a second welding fixture according to the present invention.
Fig. 13 is a structural view of the second welding fixture of the present invention after assembling the junction box.
Fig. 14 is a block diagram of the present invention.
Detailed Description
In order to make the technical scheme of the invention clearer and more definite, the invention is further described below with reference to the accompanying drawings, and any scheme obtained by carrying out equivalent substitution and conventional reasoning on the technical characteristics of the technical scheme of the invention falls into the protection scope of the invention.
Reference numerals
The case 1, the case cover 2, the sheet metal group 3, the diode 4, the cable 5, the first clip 11, the second clip 12, the third clip 13, the fourth clip 14, the cable interface 15, the cable installation through hole 16, the first sheet metal 31, the second sheet metal 32, the third sheet metal 33, the fourth sheet metal 34, the first fixing portion 35, the first diode fixing portion 36, the first cable fixing portion 37, the escape hole 38, the diode welding bump 39, the first positioning hole 310, the clip plate 311, the diode clip groove 312, the second fixing portion 313, the second diode upper fixing portion 314, the second diode lower fixing portion 315, the second positioning hole 316, the third fixing portion 317, the third diode upper fixing portion 318, the third diode lower fixing portion 319, the third positioning hole 320, the fourth fixing portion 321, the fourth diode fixing portion 323, the fourth positioning hole 324, the cable welding bump 325 the cable fixture 51, the first frame 61, the first welding platform 62, the first welding tooling 63, the first positioning insert 64, the second positioning insert 65, the first tooling body 66, the handle 67, the first socket 68, the second socket 69, the third socket 610, the first welding station 611, the second welding station 612, the third welding station 613, the diode positioning channel 614, the second positioning channel 615, the third positioning insert 616, the fourth positioning insert 617, the first cylinder 620, the second cylinder 621, the first resistance welder 622, the first transmission block 623, the second transmission block 624, the first pressure welding block 625, the second pressure welding block 626, the first spring ram 627, the second spring ram 628, the first upper electrode 629, the second upper electrode 630, the first transmission shaft 631, the second transmission shaft 632, the ram 633, the spring 634, the connection post 635, the first recess 636, the second recess 637, the second transmission shaft 632, the second spring 634, the connection post 635, the second recess 636, the second recess 637, the second connection post, the first backing plate 638, the second frame 71, the second welding platform 72, the second backing plate 73, the second welding tool 74, the third lower electrode 75, the fourth lower electrode 76, the second tool body 77, the junction box fixing groove 78, the cable positioning groove 79, the cable fixture block 710, the second resistance welder 711, the fixing platform 712, the first supporting seat 713, the third cylinder 714, the first driving plate 715, the third driving shaft 716, the third press welding block 717, the third upper electrode 718, the second supporting seat 719, the fourth cylinder 720, the second driving plate 721, the fourth driving shaft 723, the fourth upper electrode 724, the stopper 725.
The small modularized 1500V solar battery assembly junction box comprises a box body 1, a box cover 2, a metal sheet group 3, a diode 4 and a cable 5;
the box body is provided with a first clamping block 11, a second clamping block 12, a third clamping block 13 and a fourth clamping block 14, two sides of the bottom of the box body are respectively provided with a cable interface 15, and the inner side of the cable interface is provided with a cable installation through hole 16;
the metal sheet group comprises a first metal sheet 31, a second metal sheet 32, a third metal sheet 33 and a fourth metal sheet 34 from left to right in sequence;
the first metal sheet comprises a first fixing part 35, a first diode fixing part 36 and a first cable fixing part 37 which are of an integrated structure, wherein an avoidance hole 38, a diode welding lug 39 and a first positioning hole 310 are formed in the first diode fixing part, the avoidance hole is positioned on the right side of the diode welding lug, the first positioning hole is positioned below the avoidance hole, two clamping plates 311 are vertically and upwards arranged on the right side wall of the first diode fixing part, a diode clamping groove 312 is formed between the two clamping plates, and the first cable fixing part is provided with a cable welding lug;
the second metal sheet comprises a second fixing part 313, a second diode upper fixing part 314 and a second diode lower fixing part 315 which are of an integrated structure, the second diode upper fixing part is positioned at the right upper part of the second diode lower fixing part, an avoidance hole, a diode welding lug and a second positioning hole 316 are formed in the second diode upper fixing part, the avoidance hole is positioned at the left side of the diode welding lug, the second positioning hole is positioned below the avoidance hole, an avoidance hole and a diode welding lug are formed in the second diode lower fixing part, the avoidance hole is positioned at the right side of the diode welding lug, and two clamping plates are respectively arranged on the left side wall of the second diode upper fixing part and the right side wall of the second diode lower fixing part;
The third metal sheet comprises a third fixing part 317, a third diode upper fixing part 318 and a third diode lower fixing part 319 which are of an integrated structure, wherein the third diode upper fixing part is positioned at the left upper part of the third diode lower fixing part, an avoidance hole, a diode welding lug and a third positioning hole 320 are formed in the third diode upper fixing part, the avoidance hole is positioned at the right side of the diode welding lug, the third positioning hole is positioned below the avoidance hole, an avoidance hole and a diode welding lug are formed in the third diode lower fixing part, the avoidance hole is positioned at the left side of the diode welding lug, and two clamping plates are respectively arranged on the right side wall of the third diode upper fixing part and the left side wall of the third diode lower fixing part;
the fourth metal sheet comprises a fourth fixing part 321, a fourth diode fixing part 322 and a fourth cable fixing part 323 which are of an integrated structure, an avoidance hole, a diode welding lug and a fourth positioning hole 324 are formed in the fourth diode fixing part, the avoidance hole is positioned on the left side of the diode welding lug, the fourth positioning hole is positioned below the avoidance hole, two clamping plates are vertically and upwards arranged on the left side wall of the fourth diode fixing part, a diode clamping groove is formed between the two clamping plates, and a cable welding lug 325 is arranged on the fourth cable fixing part;
The number of the diodes is three, and the three diodes are respectively fixed between a first diode fixing part of the first metal sheet and a second diode upper fixing part of the second metal sheet, between a second diode lower fixing part of the second metal sheet and a third diode lower fixing part of the third metal sheet and between a third diode upper fixing part of the third metal sheet and a fourth diode fixing part of the fourth metal sheet;
the lead wire of the diode passes through a diode clamping groove formed between the two corresponding clamping plates and is fixed on the diode welding lug by resistance welding;
the first fixing part, the second fixing part, the third fixing part and the fourth fixing part of the metal sheet group are clamped and fixed in the box body, and the first clamping block, the second clamping block, the third clamping block and the fourth clamping block in the box body are respectively fixed with the first positioning hole, the second positioning hole, the third positioning hole and the fourth positioning hole in the metal sheet group in interference fit;
the two cables respectively penetrate through the two cable interfaces and are fixed on the cable welding lug through resistance welding;
the cable is fixed in the cable interface by a cable fixing block 51;
the box cover is clamped and fixed on the box body.
The assembly method of the small modularized 1500V solar battery module junction box comprises the following steps:
(1) Welding and fixing three diodes between two adjacent metal sheets through diode welding equipment respectively to form a metal sheet module;
(2) The metal sheet module is clamped and fixed in the box body;
(3) Removing an insulating layer with the length of 0.8-1.5cm at the front end of the cable, combining multi-strand wires in the cable into a whole, respectively penetrating through two cable interfaces, pre-fixing the two strands of wires through a cable fixing block, and then welding and fixing the two strands of wires on a cable welding lug through cable welding equipment;
(4) The box cover is clamped and fixed on the box body;
wherein:
the diode welding equipment in the step (1) comprises a first frame 61, a first welding platform 62, a first welding tool 63 and a diode welding mechanism;
the first welding platform is fixed at the bottom of the first frame in a lifting manner, a first positioning insert block 64 and two second positioning insert blocks 65 are arranged on the first welding platform, the top surface of the first positioning insert block is of an isosceles trapezoid structure, the second positioning insert block is of a cylinder structure, and the first positioning insert block is positioned on a middleline of a connecting line between the two second positioning insert blocks;
the first welding fixture comprises a first fixture main body 66, wherein the upper side of the first fixture main body is a plugging side, the opposite lower side of the first fixture main body is a gripping side, a handle 67 is arranged on the gripping side of the first fixture main body, a first plugging groove 68, a second plugging groove 69 and a third plugging groove 610 are arranged on the plugging side of the first fixture main body, the first plugging groove and the third plugging groove are symmetrically arranged on two sides of the second plugging groove, the first plugging groove and the third plugging groove are identical in shape and size and are in clearance fit with the first positioning plug, and the depth of the second plugging groove is smaller than that of the first plugging groove and in clearance fit with the first positioning plug; the first tooling body is provided with a first welding station 611, a second welding station 612 and a third welding station 613 which are arranged on the gripping side in a mutually flush way, the second welding station is positioned between the first welding station and the third welding station and positioned on the plugging side, the first welding station, the second welding station and the third welding station all comprise a diode positioning channel 614 and two second positioning channels 615, and the two second positioning channels are respectively positioned on two sides of the diode positioning channel; the first tooling main body is also provided with four third positioning plug blocks 616 and three fourth positioning plug blocks 617, the four third positioning plug blocks are respectively positioned at the upper sides of four second positioning channels in the first welding station and the third welding station, the three fourth positioning plug blocks are positioned at the lower sides of the first welding station and the third welding station, the third positioning plug blocks are used for fixedly plugging metal sheets to be welded, the fourth positioning plug blocks are used for separating the metal sheets to be welded, the second positioning channel is used for being matched with the two second positioning plug blocks to realize positioning, the first plugging groove, the second plugging groove and the third plugging groove are used for being matched with the first positioning plug blocks to realize positioning, and the diode positioning channel is used for placing a diode to be welded;
The diode welding mechanism comprises a first air cylinder 620, a second air cylinder 621, a first resistance welding machine 622, a first transmission block 623, a second transmission block 624, a first pressure welding block 625, a second pressure welding block 626, a first spring pressure head 627 and a second spring pressure head 628; the first cylinder and the second cylinder are fixed at the top of the first frame, the first transmission block and the second transmission block are respectively fixed on push rods of the first cylinder and the second cylinder, the first pressure welding block and the second pressure welding block are respectively fixed at the bottoms of the first transmission block and the second transmission block, a first upper electrode 629 of the first spring pressure head and the first resistance welding machine is arranged at the bottom of the first pressure welding block, the first upper electrode is positioned at the outer side of the first spring pressure head, a second upper electrode 630 of the second spring pressure head and the first resistance welding machine is arranged at the bottom of the second pressure welding block, and the second upper electrode is positioned at the outer side of the second spring pressure head; the first transmission block and the second transmission block are respectively connected with the first rack through a first transmission shaft 631 and a second transmission shaft 632; the first welding platform is provided with a first base plate 638, a first lower electrode and a second lower electrode are arranged in the first base plate, the first lower electrode and the second lower electrode are respectively positioned below the first upper electrode and the second upper electrode, the first base plate is the same as the first upper electrode and the second upper electrode in material, a positive electrode power supply of the first resistance welding machine is respectively communicated with the first upper electrode and the second upper electrode, and a negative electrode power supply of the first resistance welding machine is connected with the first lower electrode and the second lower electrode.
The first welding fixture is positioned and placed on the first welding platform, the first spring pressing head and the second spring pressing head are used for pressing the diode to be welded, and the first upper electrode and the second upper electrode are used for welding leads on two sides of the diode on corresponding metal sheets.
The first spring pressing head and the second spring pressing head comprise a pressing head 633, a spring 634 and a connecting column 635, the connecting column is fixed on the pressing head, the spring is coated outside the connecting column, one end of the spring is fixedly connected with the pressing head, the other end of the spring is fixed in a first groove 636 of a first pressure welding block or a second pressure welding block, the connecting column penetrates through the first groove and is movably arranged in a second groove 637, and the spring is a compression spring;
when the LED lamp is used, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are fixed through the third positioning plug respectively, and three diodes are placed into the three diode positioning channels respectively; when the diode of the first station is welded, the second positioning plug is inserted into two second positioning channels of the first welding station, meanwhile, the first positioning plug is inserted into the first plug groove, the first cylinder, the second cylinder and the first resistance welder are started, the first cylinder and the second cylinder are pressed on the diode to be fixed firstly by the first spring pressing head and the second spring pressing head in the pressing process, and the two leads are welded and fixed on corresponding metal sheets by the first upper electrode and the second upper electrode; when the diode of the second station is welded, the second positioning plug blocks are inserted into two second positioning channels of the second welding station, and meanwhile, the first positioning plug blocks are inserted into the second plug grooves, and welding and fixing are carried out through the steps; when the diode of the third station is welded, the second positioning plug blocks are inserted into two second positioning channels of the third welding station, and meanwhile, the first positioning plug blocks are inserted into the third plug grooves, and the welding and fixing are carried out through the steps;
The cable welding equipment in the step (3) comprises a second rack 71, a second welding platform 72, a second backing plate 73, a second welding tool 74 and a cable welding mechanism;
the second welding platform is fixed on the second frame, the second base plate is fixed on the second welding platform, and a third lower electrode 75 and a fourth lower electrode 76 are arranged on the second base plate;
the second welding fixture comprises a second fixture main body 77, a junction box fixing groove 78 is formed in the second fixture main body, the junction box fixing groove is in clearance fit with the junction box, two cable locating grooves 79 are further formed in the second fixture main body and are communicated with cable interface positions of the junction box fixing grooves, a cable clamping block 710 is arranged in each cable interface position of each junction box fixing groove, the cable clamping blocks are located on the inner sides of the cable locating grooves, the second welding fixture penetrates through a second base plate through bolts to be locked and fixed on a second welding platform, and a third lower electrode and a fourth lower electrode penetrate through the second fixture main body to be located on the inner sides of the two cable clamping blocks respectively;
the cable welding mechanism comprises a second resistance welding machine 711, a fixed platform 712, a first cable welding mechanism and a second cable welding mechanism, wherein the fixed platform is fixed on the second rack, and the first cable welding mechanism and the second cable welding mechanism are fixed on the fixed platform in a mirror image manner;
The first cable welding mechanism comprises a first supporting seat 713, a third air cylinder 714, a first transmission plate 715, third transmission shafts 716, a third pressure welding block 717 and a third upper electrode 718, wherein the first supporting seat is fixed on a fixed platform, a first adjusting groove is formed in the first supporting seat, the third air cylinder is fixed at the top of the first supporting seat, push rods of the third air cylinder penetrate through the first supporting seat to be connected with the first transmission plates arranged in the first adjusting groove, the number of the third transmission shafts is two, the two third transmission shafts are mutually parallel and fixed on the first transmission plates and are linked with the first transmission plates, the top ends of the third transmission shafts penetrate through the top ends of the first supporting seat to be exposed, the bottom ends of the third transmission shafts penetrate through the first supporting seat to be fixedly connected with the third pressure welding block, and the third upper electrode is fixed at the bottom of the third pressure welding block;
the second cable welding mechanism comprises a second supporting seat 719, a fourth air cylinder 720, a second transmission plate 721, a fourth transmission shaft 722, a fourth pressure welding block 723 and a fourth upper electrode 724, wherein the second supporting seat is fixed on a fixed platform, a second adjusting groove is formed in the second supporting seat, the fourth air cylinder is fixed at the top of the second supporting seat, push rods of the fourth air cylinder penetrate through the second supporting seat to be connected with the second transmission plate arranged in the second adjusting groove, the number of the fourth transmission shafts is two, the two fourth transmission shafts are mutually parallel and fixed on the second transmission plate and are linked with the second transmission plate, the top end of the fourth transmission shaft penetrates through the top end of the second supporting seat to be exposed outside, the bottom end of the fourth transmission shaft penetrates through the second supporting seat to be fixedly connected with the fourth pressure welding block, the fourth upper electrode is fixed at the bottom of the fourth pressure welding block 725, and the tops of the third transmission shaft and the fourth transmission shaft are respectively provided with a limiting block 725;
The positive electrode power supply of the second resistance welding machine is respectively connected with the third upper electrode and the fourth upper electrode, and the negative electrode power supply of the second resistance welding machine is respectively connected with the third lower electrode and the fourth lower electrode;
when the cable welding device is used, the box body of the assembled metal sheet module is placed in the junction box fixing groove, a cable passes through the cable interface and is pre-fixed through the cable fixing block, the front end of the cable is clamped on the cable clamping block, the rear part of the cable is placed in the cable positioning groove, the third cylinder, the fourth cylinder and the second resistance welding machine are started, and two cables are welded and fixed on corresponding cable welding convex blocks through the third upper electrode and the fourth upper electrode.
Claims (3)
1. A small modularized 1500V solar cell module junction box is characterized by comprising a box body, a box cover, a metal sheet group, a diode and a cable;
the box body is provided with a first clamping block, a second clamping block, a third clamping block and a fourth clamping block, two sides of the bottom of the box body are respectively provided with a cable interface, and the inner side of the cable interface is provided with a cable installation through hole;
the metal sheet group sequentially comprises a first metal sheet, a second metal sheet, a third metal sheet and a fourth metal sheet from left to right;
The first metal sheet comprises a first fixing part, a first diode fixing part and a first cable fixing part which are of an integrated structure, wherein an avoidance hole, a diode welding lug and a first positioning hole are formed in the first diode fixing part, the avoidance hole is positioned on the right side of the diode welding lug, the first positioning hole is positioned below the avoidance hole, two clamping plates are vertically upwards arranged on the right side wall of the first diode fixing part, a diode clamping groove is formed between the two clamping plates, and the first cable fixing part is provided with a cable welding lug;
the second metal sheet comprises a second fixing part, a second diode upper fixing part and a second diode lower fixing part which are of an integrated structure, wherein the second diode upper fixing part is positioned at the right upper part of the second diode lower fixing part, an avoidance hole, a diode welding lug and a second positioning hole are formed in the second diode upper fixing part, the avoidance hole is positioned at the left side of the diode welding lug, the second positioning hole is positioned below the avoidance hole, an avoidance hole and a diode welding lug are formed in the second diode lower fixing part, the avoidance hole is positioned at the right side of the diode welding lug, and two clamping plates are respectively arranged on the left side wall of the second diode upper fixing part and the right side wall of the second diode lower fixing part;
The third metal sheet comprises a third fixing part, a third diode upper fixing part and a third diode lower fixing part which are of an integrated structure, wherein the third diode upper fixing part is positioned at the left upper part of the third diode lower fixing part, an avoidance hole, a diode welding lug and a third positioning hole are formed in the third diode upper fixing part, the avoidance hole is positioned at the right side of the diode welding lug, the third positioning hole is positioned below the avoidance hole, the avoidance hole and the diode welding lug are formed in the third diode lower fixing part, the avoidance hole is positioned at the left side of the diode welding lug, and two clamping plates are respectively arranged on the right side wall of the third diode upper fixing part and the left side wall of the third diode lower fixing part;
the fourth metal sheet comprises a fourth fixing part, a fourth diode fixing part and a fourth cable fixing part which are of an integrated structure, an avoidance hole, a diode welding lug and a fourth positioning hole are formed in the fourth diode fixing part, the avoidance hole is positioned on the left side of the diode welding lug, the fourth positioning hole is positioned below the avoidance hole, two clamping plates are vertically upwards arranged on the left side wall of the fourth diode fixing part, a diode clamping groove is formed between the two clamping plates, and the fourth cable fixing part is provided with a cable welding lug;
The number of the diodes is three, and the three diodes are respectively fixed between a first diode fixing part of the first metal sheet and a second diode upper fixing part of the second metal sheet, between a second diode lower fixing part of the second metal sheet and a third diode lower fixing part of the third metal sheet and between a third diode upper fixing part of the third metal sheet and a fourth diode fixing part of the fourth metal sheet;
the lead wire of the diode passes through a diode clamping groove formed between the two corresponding clamping plates and is fixed on the diode welding lug by resistance welding;
the first fixing part, the second fixing part, the third fixing part and the fourth fixing part of the metal sheet group are clamped and fixed in the box body, and the first clamping block, the second clamping block, the third clamping block and the fourth clamping block in the box body are respectively fixed with the first positioning hole, the second positioning hole, the third positioning hole and the fourth positioning hole in the metal sheet group in interference fit;
the two cables respectively penetrate through the two cable interfaces and are fixed on the cable welding lug through resistance welding;
the cable is fixed in the cable interface through a cable fixing block;
the box cover is clamped and fixed on the box body.
2. The junction box of a miniaturized modular 1500V solar module of claim 1, wherein the first, second, third and fourth fixture blocks are all oval structures.
3. A miniaturized modular 1500V solar module junction box according to claim 1, characterized in that the assembly method is as follows:
(1) Welding and fixing three diodes between two adjacent metal sheets through diode welding equipment respectively to form a metal sheet module;
(2) The metal sheet module is clamped and fixed in the box body;
(3) Removing an insulating layer with the length of 0.8-1.5cm at the front end of the cable, combining multi-strand wires in the cable into a whole, respectively penetrating through two cable interfaces, pre-fixing the two strands of wires through a cable fixing block, and then welding and fixing the two strands of wires on a cable welding lug through cable welding equipment;
(4) The box cover is clamped and fixed on the box body;
wherein:
the diode welding equipment in the step (1) comprises a first rack, a first welding platform, a first welding tool and a diode welding mechanism;
the first welding platform is arranged at the bottom of the first frame, a first positioning insert block and two second positioning insert blocks are arranged on the first welding platform, the top surface of the first positioning insert block is of an isosceles trapezoid structure, the second positioning insert block is of a cylinder structure, and the first positioning insert block is positioned on a middle vertical line of a connecting line between the two second positioning insert blocks;
The first welding tool comprises a first tool main body, wherein the upper side of the first tool main body is a plugging side, the opposite lower side of the first tool main body is a gripping side, a handle is arranged on the gripping side of the first tool main body, a first plugging groove, a second plugging groove and a third plugging groove are arranged on the plugging side of the first tool main body, the first plugging groove and the third plugging groove are symmetrically arranged on two sides of the second plugging groove, the first plugging groove and the third plugging groove are identical in shape and size and are in clearance fit with the first positioning plug, and the depth of the second plugging groove is smaller than that of the first plugging groove and in clearance fit with the first positioning plug; the first fixture body is provided with a first welding station, a second welding station and a third welding station which are arranged on the gripping side in a mutually flush manner, the second welding station is positioned between the first welding station and the third welding station and positioned on the plugging side, the first welding station, the second welding station and the third welding station all comprise diode positioning channels and two second positioning channels, and the two second positioning channels are respectively positioned on two sides of the diode positioning channels; the first tooling main body is also provided with four third positioning inserting blocks and three fourth positioning inserting blocks, the four third positioning inserting blocks are respectively positioned at the upper sides of four second positioning channels in the first welding station and the third welding station, the three fourth positioning inserting blocks are positioned at the lower sides of the first welding station and the third welding station, the third positioning inserting blocks are used for inserting and fixing metal sheets to be welded, the fourth positioning inserting blocks are used for separating the metal sheets to be welded, the second positioning channel is used for being matched with the two second positioning inserting blocks to realize positioning, and the first inserting groove, the second inserting groove and the third inserting groove are used for being matched with the first positioning inserting blocks to realize positioning;
The diode welding mechanism comprises a first air cylinder, a second air cylinder, a first resistance welding machine, a first transmission block, a second transmission block, a first pressure welding block, a second pressure welding block, a first spring pressure head and a second spring pressure head; the first cylinder and the second cylinder are fixed at the top of the first frame, the first transmission block and the second transmission block are respectively fixed on push rods of the first cylinder and the second cylinder, the first pressure welding block and the second pressure welding block are respectively fixed at the bottoms of the first transmission block and the second transmission block, the first spring pressure head and the first upper electrode of the first resistance welding machine are arranged at the bottom of the first pressure welding block, the first upper electrode is positioned at the outer side of the first spring pressure head, the second spring pressure head and the second upper electrode of the first resistance welding machine are arranged at the bottom of the second pressure welding block, and the second upper electrode is positioned at the outer side of the second spring pressure head;
the first welding fixture is positioned and placed on the first welding platform, the first spring pressing head and the second spring pressing head are used for pressing a diode to be welded, and the first upper electrode and the second upper electrode are used for welding leads on two sides of the diode on corresponding metal sheets;
the first transmission block and the second transmission block are respectively connected with the first frame through a first transmission shaft and a second transmission shaft;
The first spring pressure head and the second spring pressure head comprise pressure heads, springs and connecting columns, the connecting columns are fixed on the pressure heads, the springs are coated on the outer parts of the connecting columns, one ends of the springs are fixedly connected with the pressure heads, the other ends of the springs are fixed in first grooves of the first pressure welding blocks or the second pressure welding blocks, the connecting columns penetrate through the first grooves and are movably arranged in the second grooves, and the springs are compression springs;
the first welding platform is internally provided with a first base plate, a first lower electrode and a second lower electrode are arranged in the first base plate, the first lower electrode and the second lower electrode are respectively positioned below the first upper electrode and the second upper electrode, the first base plate is the same as the first upper electrode and the second upper electrode in material, a positive electrode power supply of the first resistance welding machine is respectively communicated with the first upper electrode and the second upper electrode, and a negative electrode power supply of the first resistance welding machine is connected with the first lower electrode and the second lower electrode;
when the LED lamp is used, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are fixed through the third positioning plug respectively, and three diodes are placed into the three diode positioning channels respectively; when the diode of the first station is welded, the second positioning plug is inserted into two second positioning channels of the first welding station, meanwhile, the first positioning plug is inserted into the first plug groove, the first cylinder, the second cylinder and the first resistance welder are started, the first cylinder and the second cylinder are pressed on the diode to be fixed firstly by the first spring pressing head and the second spring pressing head in the pressing process, and the two leads are welded and fixed on corresponding metal sheets by the first upper electrode and the second upper electrode; when the diode of the second station is welded, the second positioning plug blocks are inserted into two second positioning channels of the second welding station, and meanwhile, the first positioning plug blocks are inserted into the second plug grooves, and welding and fixing are carried out through the steps; when the diode of the third station is welded, the second positioning plug blocks are inserted into two second positioning channels of the third welding station, and meanwhile, the first positioning plug blocks are inserted into the third plug grooves, and the welding and fixing are carried out through the steps;
The cable welding equipment in the step (3) comprises a second rack, a second welding platform, a second backing plate, a second welding tool and a cable welding mechanism;
the second welding platform is fixed on the second frame, the second base plate is fixed on the second welding platform, and a third lower electrode and a fourth lower electrode are arranged on the second base plate;
the second welding fixture comprises a second fixture body, wherein a junction box fixing groove is formed in the second fixture body, the junction box fixing groove is in clearance fit with the junction box, two cable locating grooves are further formed in the second fixture body and are communicated with cable interface positions of the junction box fixing grooves, a cable clamping block is arranged in each cable interface position of each junction box fixing groove and is located at the inner side of the corresponding cable locating groove, the second welding fixture is fixed on a second welding platform, and a third lower electrode and a fourth lower electrode penetrate through the second fixture body and are located at the inner sides of the two cable clamping blocks respectively;
the cable welding mechanism comprises a second resistance welding machine, a fixing platform, a first cable welding mechanism and a second cable welding mechanism, wherein the fixing platform is fixed on the second rack, and the first cable welding mechanism and the second cable welding mechanism are fixed on the fixing platform in a mirror image manner;
The first cable welding mechanism comprises a first supporting seat, a third air cylinder, a first transmission plate, a third transmission shaft, a third pressure welding block and a third upper electrode, wherein the first supporting seat is fixed on a fixed platform, a first adjusting groove is formed in the first supporting seat, the third air cylinder is fixed at the top of the first supporting seat, a push rod of the third air cylinder penetrates through the first supporting seat to be connected with the first transmission plate arranged in the first adjusting groove, the number of the third transmission shafts is two, the two third transmission shafts are mutually parallel and are fixed on the first transmission plate and are linked with the first transmission plate, the top end of the third transmission shaft penetrates through the top end of the first supporting seat to be exposed outside, the bottom end of the third transmission shaft penetrates through the first supporting seat to be fixedly connected with the third pressure welding block, and the third upper electrode is fixed at the bottom of the third pressure welding block;
the second cable welding mechanism comprises a second supporting seat, a fourth air cylinder, a second transmission plate, a fourth transmission shaft, a fourth pressure welding block and a fourth upper electrode, wherein the second supporting seat is fixed on a fixed platform, a second adjusting groove is formed in the second supporting seat, the fourth air cylinder is fixed at the top of the second supporting seat, a push rod of the fourth air cylinder penetrates through the second supporting seat to be connected with the second transmission plate arranged in the second adjusting groove, the number of the fourth transmission shafts is two, the two fourth transmission shafts are mutually parallel and are fixed on the second transmission plate and are linked with the second transmission plate, the top end of the fourth transmission shaft penetrates through the top end of the second supporting seat to be exposed outside, the bottom end of the fourth transmission shaft penetrates through the second supporting seat to be fixedly connected with the fourth pressure welding block, and the fourth upper electrode is fixed at the bottom of the fourth pressure welding block;
The positive electrode power supply of the second resistance welding machine is respectively connected with the third upper electrode and the fourth upper electrode, and the negative electrode power supply of the second resistance welding machine is respectively connected with the third lower electrode and the fourth lower electrode;
the tops of the third transmission shaft and the fourth transmission shaft are respectively provided with a limiting block;
the second welding tool is locked and fixed on the second welding platform through bolts penetrating through the second base plate;
when the cable welding device is used, the box body of the assembled metal sheet module is placed in the junction box fixing groove, a cable passes through the cable interface and is pre-fixed through the cable fixing block, the front end of the cable is clamped on the cable clamping block, the rear part of the cable is placed in the cable positioning groove, the third cylinder, the fourth cylinder and the second resistance welding machine are started, and two cables are welded and fixed on corresponding cable welding convex blocks through the third upper electrode and the fourth upper electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711029662.1A CN107634718B (en) | 2017-10-30 | 2017-10-30 | Small-size modularization 1500V solar module terminal box |
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| CN201711029662.1A CN107634718B (en) | 2017-10-30 | 2017-10-30 | Small-size modularization 1500V solar module terminal box |
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| CN107634718B true CN107634718B (en) | 2023-11-07 |
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| JP2011187974A (en) * | 2000-02-29 | 2011-09-22 | Kitani Denki Kk | Terminal box for solar cell module |
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Effective date of registration: 20181029 Address after: 212219 small and medium enterprises Pioneer Park, eight Bridge Town, Yangzhong, Zhenjiang, Jiangsu Applicant after: JIANGSU HAITIAN MICROELECTRONICS Corp. Address before: 212219 Xin'an Road, eight Bridge Town, Yangzhong City, Zhenjiang, Jiangsu Applicant before: YANGZHONG LONGFEIDA AUTO PARTS Co.,Ltd. |
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