CN107186391A - A kind of solar battery sheet automatic string welding machine welding positioning mechanism - Google Patents

Abstract

The present invention relates to solar battery sheet welding technology field, in particular to a kind of solar battery sheet automatic string welding machine welding positioning mechanism.Including bogey, longitudinal moving device, stopping means and combing alignment means, the present invention limits the transverse shifting of welding by stopping means, welding is oppressed by alignment device, then promotes alignment device to move in transverse direction, moving welding butt welding band by friction force is aligned.The present invention is simple in construction, easy to install, is capable of the precision of high degree raising welding contraposition, is easy to follow-up welding procedure, with great promotional value.

Description

Ribbon alignment mechanism for automatic stringer of solar cells

technical field

The invention relates to the technical field of solar battery sheet welding, in particular to a ribbon aligning mechanism for an automatic stringer of solar battery sheets.

Background technique

Crystalline silicon solar cell modules are an important part of solar power plants. During the production process, solar cells need to be stringed together by ribbon welding, and then glass, backplane, EVA, etc. are fixed and framed. Welding is the first and most important link in the module production process. The quality of welding not only affects the power generation efficiency of solar cells, but also affects the yield of modules. Therefore, welding is the focus of quality control in module factories.

Modern industrial production requires precise and consistent welding of solar cells. Therefore, not only must the welding temperature be well controlled, but also the length and welding position of the ribbon welded on the main grid on the front and back surfaces of the solar cell also need to be well controlled. . After a large number of experiments, it is found that the deviation of the welding position of the solar cell ribbon greatly affects the output power of the solar cell module.

The alignment accuracy of the ribbon has a great influence on the accuracy of solar cell welding. If there is an error in the initial alignment, the later welding process will not be accurate. In the prior art, the alignment of the welding strips is divided into two categories according to the feeding direction;

1. Straight line scheme, represented by the stringer of Komax company in the United States. The specific process is that the welding ribbon feeding position is located above the battery sheet, and the welding ribbon is placed on the grid line of the battery sheet after the chuck with the welding ribbon is in place. position, then release the collet and back off.

2. The side line scheme is represented by the series welding machine of Germany Teme Company. The specific process is: the welding strip is clamped, pulled, stretched, cut and other processes, and the direction of the welding strip processing branch line is parallel to the direction of the cell grid line on the conveyor belt. , the cut ribbon is sucked up by the vacuum suction device and moved in translation to coincide with the grid line of the cell.

Problems in the straight-line scheme: because the processes of clamping, pulling, stretching, cutting, dragging, loosening the chuck, placing the welding ribbon, and retracting the chuck must all be completed at the same station. Taking into account the exposed white and virtual welds caused by the displacement of the ribbon caused by moving the battery and ribbon at this time, and adopting a post-welding moving process, such as the process used by Komax, a welding process must be added at this station, which will be more time-consuming. For users, low production capacity is very unfavorable to reduce their total cost of ownership, so the market competitiveness of manufacturers is also negatively affected.

Furthermore, the linear solution actually has no alignment function, and its "feeding accuracy" is "alignment accuracy". Even if the solution of moving after welding is adopted, quality problems such as whitening are unavoidable due to the poor reproduction accuracy of the position of the ribbon head after shearing, and the displacement of the ribbon when the chuck is loose, the ribbon is released, and the chuck is retracted. Narrow grid lines and narrow ribbons are even more serious.

Secondly, because 3, 4, and 5 grid line cells all occupy a considerable market share, the width of the grid lines is different, and the corresponding width of the ribbon is also different. If a wide ribbon feeding stack is used to adapt to different width ribbons, the white The problem is even more serious. If you want to change different crenels according to the width of the ribbon, you must have spare parts for different ribbon crenels. The adjustment is also time-consuming and the user experience is poor.

In addition, when this solution deals with 1/4 or less cut pieces (that is, cut 156mm×156mm into 4, 5, and 6 equal parts), the whitening problem is almost uncontrollable because the welding strip is short.

Problems in the side line scheme: the side line scheme, because it completes the processes of clamping, pulling, stretching, cutting the welding strip, dragging the welding strip, loosening the chuck, putting the welding strip, and retracting the chuck on the branch line, and then the welding strip is sucked by the strip suction device. The ribbon is moved to a position coincident with the cell grid line and placed. When the side line scheme is adopted, the production capacity is usually more than double that of the straight line scheme. However, this solution has the problem that the welding ribbon suction head cannot absorb the welding ribbon or the welding ribbon falls halfway. At the same time, based on the same reasons as the above-mentioned straight line scheme, the side line scheme also has problems such as low alignment accuracy and poor adaptability.

Contents of the invention

The purpose of the present invention is to solve the disadvantages of the above-mentioned background technology, and to provide a ribbon aligning mechanism for an automatic stringer of solar cells.

The technical solution of the present invention is: a solar cell automatic stringer welding ribbon alignment mechanism, which is characterized in that it includes:

a carrying device, the carrying device includes a tray for receiving the cut ribbon;

A vertical moving device, the vertical moving device includes a guide rail arranged in a horizontal and longitudinal direction below the tray, and a sliding bracket connected to the tray matched with the guide rail;

A limiting device, the limiting device includes a plurality of sets of positioning pins arranged at intervals along the horizontal and longitudinal directions on the pallet, and each set of positioning pins includes two vertical positioning pins arranged on both lateral sides of the welding strip;

The carding and alignment device, the carding and alignment device includes a depressing tongue arranged on the tray that can press the welding belt to attach the welding belt to the positioning pin on one side through the action of friction.

Further, the tray is provided with a waist-shaped first elongated hole arranged in the transverse direction; the positioning pin passes through the tray in the vertical direction; the depressing tongue is passed through the first elongated hole, The tongue includes a vertical bar arranged in the vertical direction and a cross bar for pressing the welding ribbon. The cross bar is fixed on the upper end of the vertical bar to form a ""-shaped structure; Horizontal push device.

Further, the horizontal pushing device includes a frame and a first sliding member; the frame is horizontally slidably arranged between the sliding bracket and the tray; the vertical bar is threaded on the frame so as to move laterally with the frame ; The side of the frame is provided with a first wedge-shaped block protruding laterally; the side of the first wedge-shaped block facing the first slide is provided with a first inclined surface inclined laterally; A sliding piece is fixed on the support seat installed on the ground, and its lateral side end is slidably connected to the first inclined surface of the side of the first wedge block.

Further, the first sliding member is a bearing fixed on the support base through a vertical pin, and the outer ring of the first sliding member is rollingly connected to the first inclined surface of the side of the first wedge block.

Further, the cross bar is located between two adjacent sets of positioning pins.

Further, the sliding bracket is provided with a plurality of trays, each tray corresponds to a welding ribbon, and the plurality of trays are arranged on the sliding bracket at intervals along the horizontal and transverse direction.

Further, a vertical pushing device for driving the positioning pin and the depressing tongue to move up and down is arranged between the sliding bracket and the frame.

Further, the vertical pushing device includes a support plate and a second sliding member; the support plate is vertically movably arranged between the sliding bracket and the frame; the lower end of the positioning pin is fixed on the support plate, The upper end of the positioning pin passes through the frame and the tray; the lower end of the vertical bar is connected to the supporting plate in a movable manner in the lateral direction; the lower end of the supporting plate is provided with a second wedge-shaped block protruding downward; the second The lower end surface of the wedge block is provided with a second inclined surface inclined vertically; the second slider is driven to move horizontally and laterally by the drive device installed on the sliding bracket, and the upper end of the second slider is slidably connected to the second wedge on the second inclined face of the block.

Further, a shaft sleeve and an optical shaft are arranged between the support plate and the sliding bracket; the shaft sleeve is fixed on the sliding bracket; the upper end of the optical shaft is fixed on the sliding bracket, and the lower end is sleeved on the sliding bracket so that it can move up and down. inside the bushing.

Further, a horizontal buffer structure is provided between the frame and the sliding bracket; the horizontal buffer structure includes a fixing seat fixed on the sliding bracket and a buffer installed on the fixing seat; the buffer and the first The sliding parts are separately arranged on two lateral sides of the frame.

The advantages of the present invention are as follows: 1. The present invention can press the welding strip when the welding strip is cut by setting the pressing tongue on the alignment mechanism, so as to prevent the shaking of the welding strip during the cutting process, and facilitate the adjustment of the welding strip by the alignment mechanism. accurate locating;

2. The present invention restricts the lateral movement of the welding strip by setting the positioning pin structure, and can quickly and conveniently locate the welding strip by cooperating with the depressing tongue, which improves the efficiency and accuracy of welding strip positioning;

3. The depressing tongue provided in the present invention pushes the welding strip to move through the action of friction, without damaging the structure of the welding strip, and can effectively ensure the integrity of the welding strip under the premise of improving the alignment accuracy of the welding strip;

4. By setting the horizontal push device, the present invention can use the power of the sliding bracket to move in the longitudinal direction to push the frame and press the tongue to move in the lateral direction to complete the alignment of the welding ribbon. The structure is simple, and the use is convenient and efficient;

5. In the present invention, a vertical pushing device is arranged at the lower end of the positioning pin and the depressing tongue, so that the positioning pin and the depressing tongue can be retracted to the bottom of the tray after the alignment is completed, so as to avoid interference with the suction cup when the suction cup absorbs the solder ribbon;

6. The sliding bracket of the present invention is equipped with a buffer structure, which can prevent the irregular movement of the depressing tongue from affecting the alignment of the welding strips caused by shaking during the lateral movement of the frame, and improve the alignment accuracy of the welding strips.

The invention has the advantages of simple structure, convenient installation and use, can greatly improve the alignment accuracy of welding strips, is convenient for subsequent welding processes, and has great popularization value.

Description of drawings

Fig. 1: the top view of alignment mechanism of the present invention;

Figure 2: a side view of the alignment mechanism of the present invention;

Figure 3: a schematic diagram of the installation structure of the positioning pin and the depressing tongue of the alignment mechanism of the present invention;

Among them: 101—tray; 102—guide rail; 103—locating pin; 104—depressing tongue; 105—sliding bracket; 106—the first long hole; 107—frame; 108—the first sliding member; 109—the first wedge block; 110—support plate; 111—the second sliding member; 112—the second wedge block; 113—shaft sleeve; 114—optical axis; 115—fixed seat; 116—buffer; 117—servo motor; - drive unit.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

As shown in Figures 1 to 3, a ribbon alignment mechanism for an automatic stringer of solar cells includes a carrying device, a longitudinal moving device, a limiting device, and a carding and aligning device.

The longitudinal moving device of the present embodiment comprises guide rails 102 arranged horizontally and longitudinally (the longitudinal direction of this embodiment refers to the left-right direction in Fig. 1, the transverse direction refers to the up-down direction in Fig. 1, and vertically refers to the direction perpendicular to the drawing of Fig. 1) , and the servo motor 117 arranged on the guide rail 102, the slide bracket 105 is installed on the guide rail 102, and the slide bracket 105 moves along the guide rail 102 under the drive of the servo motor 117. The sliding bracket 105 is used to transport the solder ribbon to the vicinity of the suction cup to facilitate the suction cup to absorb the solder ribbon.

The carrying device includes a plurality of trays 101 arranged side by side in the horizontal direction for receiving the cut ribbons. Each tray 101 is a strip-shaped plate structure, and each tray 101 corresponds to one ribbon. The number of trays 101 Corresponds to the number of ribbons. The tray 101 is fixed on the sliding bracket 105 , and the tray 101 moves along the guide rail 102 together with the sliding bracket 105 .

The limiting device includes multiple sets of positioning pins arranged at intervals along the horizontal and longitudinal directions on the tray 101. Each set of positioning pins includes two vertical positioning pins 103 placed on both lateral sides of the welding strip. The length of the band sets the distance between adjacent two sets of positioning pins. One positioning pin 103 in each set of positioning pin shafts is used to limit the lateral movement of the welding ribbon, and the other positioning pin 103 not only functions to limit the lateral movement of the welding ribbon, but also serves as a positioning function. The distance between the two positioning pins 103 is slightly larger than the width of the welding ribbon, and the welding ribbon can be finely adjusted laterally between the two positioning pins 103 .

The carding and aligning device includes a depressing tongue 104 that is installed on the tray 101 and can be pressed on the welding ribbon to make the welding ribbon adhere to the positioning pin 103 on one side through frictional force. The depressing tongue 104 includes a vertical bar arranged in the vertical direction And the horizontal bar used to compress the welding ribbon, the horizontal bar is fixed on the upper end of the vertical bar to form a "7"-shaped structure, the horizontal bar is made of nylon, which can effectively increase the friction, the nylon material is not easy to damage the welding ribbon, and the horizontal bar is located adjacent to the Between two sets of positioning pins 103 . The tray 101 is provided with a waist-shaped first elongated hole 106 arranged in the transverse direction. As shown in FIG. Move up and down and sideways. The depressing tongue 104 moves downward, and the crossbar presses on the welding strip. At this time, the shearing of the welding strip can avoid the shaking of the welding strip. The depressing tongue 104 moves along the first elongated hole 106. Under the action of friction, the welding strip follows the horizontal direction. The rod moves along the transverse direction and fits on the positioning pin 103 on one side, and the positioning pin 103 restricts the further movement of the welding strip so as to realize the alignment of the welding strip. After the welding ribbon alignment is completed, the cross bar on the tongue 104 continues to move along the first long hole 106 until the welding ribbon and the cross bar do not intersect in the vertical direction, then the cross bar moves down to prevent the suction cup from absorbing the welding tape Suction cups interfere.

The structure that realizes that the crossbar moves along the first elongated hole 106 is a lateral thrusting device. As shown in FIG. Between the trays 101, the frame 107 of this embodiment includes a square frame, on which a tongue-depressing moving bar is installed, one end of the tongue-pressing moving bar is fixed on the square frame, and the other end is sleeved on the vertical bar of the tongue-pressing 104, That is, the tongue depressing moving bar can push the vertical rod to move horizontally, but does not restrict the vertical rod to move up and down. During the lateral movement of the frame 107 , the tongue depressor moving bar moves along with the frame 107 to realize the lateral movement of the tongue depressor 104 .

The first slider 108 of this embodiment is a bearing fixed on the support seat 118 (the support seat 118 is fixed on the ground and does not move with the sliding bracket 105) through a vertical pin shaft, and the inner ring of the bearing is fixed on the support seat through a vertical pin shaft. 118 on. The lateral side of the frame 107 is provided with a first wedge-shaped block 109 corresponding to the first slider 108, the first wedge-shaped block 109 is a boss structure protruding from the side of the frame 107 in the lateral direction, and the first wedge-shaped block 109 slides toward the first One side of the member 108 is provided with a first inclined surface inclined along the transverse direction, and the rolling surface of the outer ring of the first sliding member 108 is slidably connected to the first inclined surface on the side of the first wedge block 109 . When the frame 107 moved horizontally and vertically along with the slide bracket 105, the first wedge block 109 on the frame 107 moved in the lateral direction under the pushing effect of the first sliding member 108, and the depressing tongue 104 was limited to the frame 107 ( Tongue depressing moving bar), moves along the first long hole 106 under the promotion of frame 107, realizes the function of lateral movement.

In order to avoid the vibration problem of the depressing tongue 104 during the lateral movement, a lateral buffer structure is provided between the frame 107 and the sliding bracket 105 in this embodiment. The lateral buffer structure includes a fixing base 115 fixed on the sliding bracket 105 and a The buffer 116 on the fixing seat 115 is separated from the first sliding member 108 on two lateral sides of the frame 107 . During the lateral movement of the frame 107 , the buffer 116 provides a buffering force to avoid shaking of the depressing tongue 104 caused by large movements of the frame 107 .

The function of the vertical movement of the depressing tongue 104 is realized by a vertical pushing device. As shown in FIG. Between the sliding bracket 105 and the frame 107 , the support plate 110 can move along the guide rail 102 together with the sliding bracket 105 . The lower end of the support plate 110 is provided with a second wedge-shaped block 112 protruding downward, and the lower end surface of the second wedge-shaped block 112 is provided with a second inclined surface inclined vertically. The device 119 is driven to move along the horizontal and transverse direction, the second sliding member 111 is a bearing structure, and the rolling surface of the outer ring of the second sliding member 111 is supported on the second inclined surface of the second wedge block 112 . The driving device 119 is a motor, an air cylinder or other structures. The driving device 119 drives the second sliding member 111 to move horizontally and laterally. The second sliding member 111 pushes the second wedge block 112 to raise or lower the support plate 110 .

In this embodiment, the lower end of the positioning pin 103 is fixed on the support plate 110, and the upper end of the positioning pin 110 passes through the frame 107 and the tray 101. The frame 107 and the tray 101 do not limit the lateral movement of the positioning pin 110, and the positioning pin 110 is pushed by the support plate 110. Realize ascent or descent. The lower end of the vertical bar of the tongue depressor 104 is movable along the lateral direction and is connected to the support plate 110. The support plate 110 is provided with a waist-shaped second elongated hole. The long axis of the second elongated hole is arranged along the lateral direction. The lower end of the vertical bar The support plate 110 is supported on the lower end of the vertical rod, and the support plate 110 does not restrict the horizontal and lateral movement of the vertical rod. The depressing tongue 104 and the positioning pin 103 are lifted or lowered through the support plate 110 .

The support plate 110 rises or falls through the cooperation of the second slider 111 and the second wedge block 112. In order to avoid the problem of shaking when the support plate 110 rises or falls, guide structures are provided on both sides of the support plate 110 in this embodiment . As shown in Figure 2, the guide structure includes a shaft sleeve 113 and an optical shaft 114, the shaft sleeve 113 and the optical shaft 114 are located between the support plate 110 and the sliding bracket 105, the shaft sleeve 113 is fixed on the sliding bracket 105, and the upper end of the optical shaft 114 is fixed on the sliding bracket 105. The upper and lower ends of the bracket 105 are sleeved in the shaft sleeve 113 so as to move up and down. When the support plate 110 rises or falls, the optical axis 114 slides up and down in the bushing 113 to realize the guiding function and avoid the support plate 110 from shaking.

During actual use, when the welding ribbon enters on the tray 101, the positioning pin 103 and the depressing tongue 104 are raised at this time, the welding ribbon passes between the two positioning pins of each set of positioning pins, and the depressing tongue 104 presses down the welding The cutting device cuts off the welding strip, and the pressing tongue 104 presses the welding strip to avoid shaking of the welding strip during cutting.

After the welding ribbon is cut off, the servo motor 117 drives the sliding bracket 105 to move along the guide rail 102, and the first wedge block 109 pushes the frame 107 to move in the lateral direction under the extrusion action of the first sliding member 108, and the depressing tongue 104 drives the welding rod through friction. The strip moves in the transverse direction until the welding strip fits on the positioning pin 103 on one side, and the welding strip has been aligned accurately.

The depressing tongue 104 continues to move in the lateral direction until the cross bar on the depressing tongue 104 does not intersect with the welding strip in the vertical direction, and the driving device 119 starts to push the second sliding member 111 to move in the lateral direction, and the second sliding member 111 pushes the support plate 110 descends, and the positioning pin 103 and the depressing tongue 104 are retracted to the bottom of the tray 101. At this time, the tray 101 is transported to the adsorption station of the suction cup, and the suction cup absorbs the solder ribbon and transports it to the battery sheet for welding.

Servo motor 117 reversely drives sliding bracket 105 to make it return to the initial position. During the recovery process, frame 107 moves in reverse, depressing tongue 104 returns to the original horizontal position, support plate 110 rises, depressing tongue 104 and positioning pin 103 return to Original vertical position, proceed to the alignment process of the next ribbon.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A solar cell automatic stringer welding ribbon alignment mechanism, characterized in that: comprising a carrying device, the carrying device comprising a tray (101) for receiving the cut ribbon; a vertical moving device, the vertical moving device comprising a guide rail (102) arranged in a horizontal and longitudinal direction below the tray (101), and a sliding bracket (105) matched with the guide rail (102) and connected to the tray; A limit device, the limit device includes a plurality of sets of positioning pin shafts arranged at intervals along the horizontal and longitudinal directions on the tray (101), each set of positioning pin shafts includes two vertical positioning pins arranged on both lateral sides of the welding strip (103); A carding and alignment device, the carding and alignment device includes a pressing tongue (104) arranged on the tray (101) that can be pressed on the welding strip to attach the welding strip to one side of the positioning pin (103) through frictional force. 2. A method for cutting and aligning welding strips according to claim 1, characterized in that: the tray (101) is provided with a waist-shaped first long hole (106) arranged in the transverse direction; The positioning pin (103) passes through the tray (101) in the vertical direction; the pressing tongue (104) is penetrated in the first long hole (106), and the pressing tongue (104) includes vertically arranged The vertical bar and the cross bar used to compress the welding strip, the cross bar is fixed on the upper end of the vertical bar to form a "7"-shaped structure; the sliding bracket (105) is provided with a horizontal push that drives the cross bar to move in the lateral direction device. 3. A method for shearing and aligning welding strips according to claim 2, characterized in that: said lateral pushing device comprises a frame (107) and a first sliding member (108); said frame ( 107) It can be horizontally slidably arranged between the sliding bracket (105) and the tray (101); the vertical bar can move laterally with the frame (107) and pass through the frame (107); the frame (107) ) is provided with a first wedge-shaped block (109) protruding laterally; the side of the first wedge-shaped block (109) facing the first sliding member (108) is provided with a first inclined surface inclined laterally ; The first sliding member (108) is fixed on the support seat (118) installed on the ground, and its lateral side end is slidably connected to the first inclined surface of the side of the first wedge block (109). 4. A method for shearing and aligning welding strips according to claim 3, characterized in that: the first sliding member (108) is a bearing fixed on the supporting base (118) through a vertical pin , the outer ring of the first sliding member (108) is rollingly connected to the first inclined surface of the side part of the first wedge block (109). 5. A method for cutting and aligning welding strips according to claim 3, characterized in that: said cross bar is located between two adjacent sets of positioning pins (103). 6. The method for cutting and aligning welding strips according to any one of claims 1 to 3, characterized in that: the sliding bracket (105) is provided with a plurality of trays (101), and each tray (101 ) corresponds to one welding strip, and a plurality of trays (101) are arranged on the sliding support (105) at intervals along the horizontal and transverse direction. 7. A method for cutting and aligning welding strips according to claim 6, characterized in that: a driving positioning pin (103) and a depressing tongue are arranged between the sliding bracket (105) and the frame (107). (104) the vertical pushing device that moves up and down. 8. A method for shearing and aligning welding strips according to claim 7, characterized in that: said vertical pushing device comprises a support plate (110) and a second sliding member (111); said The support plate (110) is vertically movably arranged between the sliding bracket (105) and the frame (107); the lower end of the positioning pin (103) is fixed on the support plate (110), and the upper end of the positioning pin (110) passes through through the frame (107) and the tray (101); the lower end of the vertical bar is connected to the support plate (110) in a laterally movable manner; the lower end of the support plate (110) is provided with a second protruding downward Wedge block (112); the lower end surface of the second wedge block (112) is provided with a second inclined surface inclined vertically; The driving device (119) is driven to move along the horizontal and transverse direction, and the upper end of the second sliding member (111) is slidably connected to the second inclined surface of the second wedge block (112). 9. A method for cutting and aligning welding strips according to claim 8, characterized in that: a shaft sleeve (113) and an optical axis ( 114); the shaft sleeve (113) is fixed on the sliding bracket (105); the upper end of the optical axis (114) is fixed on the sliding bracket (105), and the lower end is set on the shaft sleeve (113) movable up and down )Inside. 10. A method for shearing and aligning welding strips according to claim 2, characterized in that: a transverse buffer structure is set between the frame (107) and the sliding bracket (105); the transverse buffer The structure includes a fixed seat (115) fixed on the sliding bracket (105) and a buffer (116) installed on the fixed seat (115); the buffer (116) is separated from the first sliding member (108) On both lateral sides of the frame (107).