Rolling mechanism, welding strip shaping device and photovoltaic cell string welding machine

Abstract

The present application discloses a rolling mechanism, a welding strip shaping device and a photovoltaic cell string welding machine, which belong to the field of solar cells. The rolling mechanism includes a first rotating body and a second rotating body. The first rotating body has a first circumferential surface and a first eccentric convex portion protruding from the first rotating body; the second rotating body has a second circumferential surface. A first gap for driving the pressed object to feed is formed between the two circumferential surfaces. A second gap for rolling the pressed object is formed between the second circumferential surface and the first eccentric convex portion. The second rotating body also has a limited degree of freedom along the direction of the axis connecting the first rotating body and the second rotating body, so that the second rotating body can synchronously maintain the thickness of the first gap and the second gap when forced to move during the rolling process. The rolling mechanism can drive the welding strip to convey the welding strip during the rolling process, and the thickness of the welding strip after rolling has higher consistency due to the limited degree of freedom of the rotating body.

Description

Technical Field

[0001] The present application belongs to the field of solar cells, especially the field of cell string manufacturing. In particular, the present application relates to a rolling mechanism, a welding strip shaping device and a photovoltaic cell string welding machine. Background Art

[0002] The photovoltaic cell string is formed by stacking the welding strips and the cells in a predetermined order and then welding them together. Two adjacent cells are connected together by a set of welding strips. Specifically, the first part of the welding strip is welded to the main grid line on the front of the previous cell, and the second part of the welding strip is welded to the main grid line on the back of the next cell. In order to make the welding strip fit the main grid line on the surface of the cell, the area between the first part and the second part of the welding strip needs to be flattened.

[0003] The traditional solder ribbon flattening device includes a pressure block and a carrier table. When the solder ribbon passes between the pressure block and the carrier table, the solder ribbon pressing plate device drives the pressure block to descend, pressing the solder ribbon against the carrier table to flatten the solder ribbon. However, when flattening the solder ribbon in this way, the solder ribbon must remain stopped, and the production efficiency is low. Utility Model Content

[0004] The example of the present application provides a rolling mechanism, a welding strip shaping device and a photovoltaic cell string welding machine, which can flatten the welding strip efficiently and with high quality.

[0005] The solution of this application example is implemented through the following contents.

[0006] In a first aspect, an example of the present application provides a rolling mechanism, and the rolling mechanism includes: a first rotating body and a second rotating body;

[0007] The first rotating body has a first circumferential surface and a first eccentric protrusion protruding from the first circumferential surface;

[0008] The second rotating body has a second circumferential surface, a first gap for driving the pressed object to feed is formed between the second circumferential surface and the first circumferential surface, a second gap for rolling the pressed object is formed between the second circumferential surface and the first eccentric convex portion, and the first gap is larger than the second gap;

[0009] The second rotating body also has a limited degree of freedom along the direction of the axis connecting the first rotating body and the second rotating body, so that the second rotating body can synchronously maintain the thickness of the first gap and the second gap when forced to move during the rolling process.

[0010] The first rotating body and the second rotating body can provide a force to the solder strip along the thickness direction and the length direction of the solder strip by rotating. In this way, the solution can not only flatten the solder strip, but also drive the solder strip forward, thereby realizing the flattening operation without stopping the conveyance of the solder strip. This method makes the flattening process of the solder strip more efficient.

[0011] And because the second rotating body also has limited freedom along the direction of the axis connecting the first rotating body and the second rotating body, the second rotating body can remain in close contact with the first rotating body during the process of conveying and flattening the welding strip, thereby ensuring high flattening quality and good consistency of the flattening effect.

[0012] According to some examples of the first aspect of the present application, the rolling mechanism includes a base, and the first rotating body and the second rotating body are connected to the base; and / or, the first circumferential surface has multiple surfaces and is evenly distributed along the axial direction of the first rotating body.

[0013] Multiple circumferential arrangements can be used to flatten multiple welding strips, thereby improving the utilization rate of the equipment. Equally spaced arrangements can make multiple welding strips distributed regularly, facilitate transportation, and avoid interference between multiple welding strips during transportation.

[0014] According to some examples of the first aspect of the present application, the first rotating body has a first groove recessed from the outer peripheral surface, the groove bottom surface of the first groove is a first circumferential surface, and the first eccentric protrusion is located in the first groove.

[0015] The setting of the first groove can accommodate the welding strip, thereby confining the welding strip within the groove, and also standardizing the posture of the welding strip during the conveying process, so that the flattening width of the welding strip remains more consistent, which in turn also contributes to the welding quality of the battery string used for manufacturing.

[0016] According to some examples of the first aspect of the present application, the first groove and the first eccentric protrusion are arranged in pairs, and there are multiple pairs in the rolling mechanism and they are distributed at intervals along the axial direction of the first rotating body.

[0017] Each first eccentric protrusion is arranged in the first groove, so that each welding strip can be isolated by the groove, and the installation of the second rotating body is also convenient.

[0018] According to some examples of the first aspect of the present application, the number of the second rotating bodies is the same as that of the first slots, and they are arranged in a one-to-one correspondence.

[0019] The number of the first grooves is equal to that of the second rotating bodies and they correspond to each other one by one, so that the rollable area of ​​the first rotating body can be fully utilized, which helps to improve efficiency.

[0020] According to some examples of the first aspect of the present application, the second rotating body has a second eccentric convex portion protruding from the second circumferential surface and corresponding to the first eccentric convex portion.

[0021] Compared with the first eccentric protrusion and the second circumferential surface cooperating to roll the welding strip, the first eccentric protrusion and the second eccentric protrusion cooperating to roll the welding strip can adapt the degree of flattening of the welding strip, and can also provide different degrees and effects of flattening of the welding strip.

[0022] According to some examples of the first aspect of the present application, the second rotating body has a second groove recessed from the outer peripheral surface, the groove bottom surface of the second groove is a second circumferential surface, and the second eccentric protrusion is located in the second groove.

[0023] During the flattening process, the second groove can also constrain and limit the welding strip, for example, it can make the welding strip enter the rolling mechanism in a smoother and uniform posture, thereby also helping to improve the rolling effect.

[0024] According to some examples of the first aspect of the present application, the rolling mechanism includes a base and a top cover that are connected to each other, the first rotating body is connected to the base, and the second rotating body is connected to the top cover.

[0025] The first rotating body and the second rotating body can be shielded / covered between the top cover and the base to prevent debris or foreign matter from entering between the first rotating body and the second rotating body, thereby protecting the welding strip and the equipment and helping to reduce potential operating risks for users.

[0026] According to some examples of the first aspect of the present application, the base and the top cover are detachably connected; and / or, the top cover is hinged to the base; and / or, the rolling mechanism includes a buckle for locking the base and the top cover.

[0027] The base and top cover are hinged, and the top cover can be easily opened and closed with a buckle, making it easy to maintain the equipment.

[0028] According to some examples of the first aspect of the present application, the rolling mechanism includes a first driver connected to the base, the first driver is drivingly connected to the first rotating body, and the first driver is used to drive the first rotating body to rotate along its own axis.

[0029] The rolling mechanism is equipped with a first driver, which is designed and improved as a complete set of products, thereby reducing the inconvenience of users preparing their own drivers.

[0030] According to some examples of the first aspect of the present application, the first driver is a motor, and is driven and connected to the first rotating body by means of a belt drive or a chain drive.

[0031] Compared with other driving parts, the motor has a smaller size, higher working precision and is easy to integrate.

[0032] According to some examples of the first aspect of the present application, the rolling mechanism includes a first hinged arm connected to an elastic member and hinged to a base, and the elastic member causes the first hinged arm to be subjected to force to contact a first circumferential surface of the first rotating body.

[0033] By the elastic member and the first hinged arm cooperating with each other to abut against the first rotating body, the first rotating body can be more stably pressed against the second rotating body, thereby reducing its undesired displacement.

[0034] According to some examples of the first aspect of the present application, the first articulated arm is in rolling contact with the first circumferential surface through a rotating portion; and / or the rolling mechanism includes a pressure block arranged between the elastic member and the first articulated arm, and the elastic member applies force to the first articulated arm through the pressure block.

[0035] The rotating part cooperates with the first rotating body to allow a supporting force to be applied thereto in a rotating state, thereby ensuring a close contact state while flattening and conveying the welding strip.

[0036] The elastic member can provide sufficient and stable supporting force and also provide redundancy, that is, when the first rotating body increases the reverse force to a large extent, it can produce a certain displacement, thereby reducing the risk of damage to the first articulated arm when the force is too great.

[0037] According to some examples of the first aspect of the present application, the rolling mechanism includes a second hinged arm and a third roller hinged to the top cover, the second rotating body is rotatably connected to the first end of the second hinged arm, the third roller is rotatably connected to the second end of the second hinged arm, and the third roller is subjected to force to make the second rotating body abut against the first rotating body.

[0038] The second rotating body is equipped with a second articulated arm and a third roller to adjust the controlled degree of freedom thereof to ensure close contact.

[0039] According to some examples of the first aspect of the present application, the rolling mechanism includes a sliding assembly, which includes a wedge-shaped sliding member and a second driver and a fourth roller respectively connected to the top cover; wherein the wedge-shaped sliding member is drivenly connected to the driving end of the second driver, the fourth roller is in sliding contact with the wedge-shaped sliding member, the inclined surface of the wedge-shaped sliding member is in abutment with the third roller, and the second driver drives the wedge-shaped sliding member to slide horizontally to make the second rotating body approach or move away from the first rotating body.

[0040] The sliding assembly can slide horizontally under the action of the second driver, and the third roller resting on the sliding assembly can move up and down. The fourth roller can carry the sliding assembly and restrict the sliding assembly so that the sliding assembly has only the freedom of sliding.

[0041] According to some examples of the first aspect of the present application, the rolling mechanism includes a guide having a support plate and a cover plate, and the support plate and the cover plate jointly provide a constrained gap to guide the pressed object to move toward between the first rotating body and the second rotating body.

[0042] The guide restricts the posture of the welding strip entering and exiting the roller pressing mechanism, which is more convenient for transportation and is also conducive to feeding between the first rotating body and the second rotating body, avoiding unexpected changes in the posture of the welding strip such as deviation and twisting, thereby improving the stability of its transportation.

[0043] According to some examples of the first aspect of the present application, there are two guides, which are respectively located on both sides of the first rotating body and the second rotating body in the rolling direction.

[0044] According to some examples of the first aspect of the present application, the first rotating body and the second rotating body are rollers or cylindrical rods.

[0045] In a second aspect, an example of the present application provides a welding strip shaping device, which includes the aforementioned rolling mechanism.

[0046] In a third aspect, the example of the present application provides a photovoltaic cell string welding machine, which includes the aforementioned rolling mechanism and a welding ribbon shaping device.

[0047] In the above implementation, the rolling mechanism has the function of driving the solder strip forward, and also has the function of squeezing the solder strip to flatten it by rolling.

[0048] The first rotating body and the second rotating body rotate with each other so that the first circumferential surface and the second circumferential surface contact the welding strip, and the first gap between the two is adapted to (e.g., equal to) the thickness of the welding strip so that the welding strip can be driven to move forward during rotation. In this way, the welding strip is continuously fed and the welding strip is not flattened at this time.

[0049] Afterwards, as the first rotating body and the second rotating body continue to rotate and the welding strip is continuously fed, the first rotating body rotates until the first eccentric convex portion on its surface is close to and opposite to the second circumferential surface, and the gap between the first eccentric convex portion and the second circumferential surface is smaller than the thickness of the welding strip, so that the welding strip is squeezed and flattened at this position.

[0050] Through the above solution, the soldering strip can be continuously and automatically conveyed and processed, so that a plurality of flattened portions are formed at intervals at designated positions of the soldering strip.

[0051] In particular, since the second rotating body has limited freedom along the thickness direction, in the process of extruding the welding strip through the cooperation of the first eccentric protrusion and the second circumferential surface, the second rotating body can be adaptively controlled to adjust its own posture, thereby controlling the distance between the two rotating bodies, and at the same time enabling the welding strip to obtain continuous and stable extrusion force.

[0052] In this way, the flattening process of the welding strip is more gentle, and the flattened portion is more flat, which avoids excessive compression of some positions in any compression section and too little compression of other positions due to some factors (such as looseness of the second rotating body), thereby making the thickness of the flattened position more consistent. At the same time, it also avoids the problem of thin and brittle welding strips being damaged due to inappropriate extrusion process during rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] For a clearer explanation, the following briefly introduces the drawings required for the description.

[0054] Figure 1 It is a schematic diagram of the overall structure of the rolling mechanism in the example of this application;

[0055] Figure 2 Shown Figure 1 A schematic structural diagram of the first rotating body and the second rotating body in the rolling mechanism and the assembly of the supporting structure thereof;

[0056] Figure 3 Shown Figure 1 A schematic structural diagram of a state in which a first rotating body and a second rotating body in a rolling mechanism cooperate with each other to form a flattened welding strip;

[0057] Figure 4 Recorded Figure 1 A schematic structural diagram of a rolling mechanism in a top-down view;

[0058] Figure 5 Recorded Figure 4 A schematic cross-sectional view of the rolling mechanism along the CC plane;

[0059] Figure 6 A schematic diagram of the structure of the guide in the rolling mechanism is recorded.

[0060] Explanation of the reference numerals: 100-rolling mechanism; 101-first rotating body; 102-second rotating body; 103-welding strip; 104-buckle; 105-base; 106-top cover; 107-first driver; 108-transmission belt; 201-wedge-shaped sliding member; 202-second driver; 203-first groove; 204-first eccentric convex portion; 205-elastic member; 206-first articulated arm; 207-rotating portion; 208-pressing block; 209-second articulated arm; 210-fourth roller; 300-third roller; 401-guide; 402-support plate; 403-cover plate; 404-limiting groove. DETAILED DESCRIPTION

[0061] In the field of photovoltaic cells, it is usually necessary to use welding ribbons to string together multiple cells. Therefore, the quality of the welding ribbon is closely related to the quality of the product after string welding. As described above, in order to obtain an ideal string welding effect, the portion between the two ends of the welding ribbon is flattened.

[0062] The current flattening equipment is a combination of a pressing block and a carrier. This solution cannot keep the ribbon conveyed during the crimping process, but needs to temporarily pause the ribbon and wait for it to be flattened before other equipment continues to convey and pull it to the next flattening position.

[0063] The inventors found that the efficiency of such a flattening scheme is very low and it is necessary to improve and optimize it.

[0064] After analysis, it is found that when the above-mentioned flattening scheme is implemented, the pressing block and the carrier do not move along the length direction of the solder strip, or in other words, no force is provided to the solder strip to make it move along the length direction. On the contrary, the flattening force is applied perpendicular to the surface of the solder strip or the surface in the length direction, so that the solder strip needs to be flattened in a static state.

[0065] Therefore, in order to flatten the welding strip while maintaining the conveying state of the welding strip, thereby obtaining a solution with high flattening processing efficiency, the key is to subject the welding strip to forces parallel and perpendicular to its length direction. The parallel force causes the welding strip to move forward (i.e., it is driven to be in the conveying state), and the perpendicular force causes the welding strip to be flattened.

[0066] Based on this consideration, the present application chooses to adjust the previous flattening scheme of the up-and-down movement to realize the flattening and conveying of the welding strip by the rotational movement of the rotating structure. For example, the welding strip between the two rotating structures is flattened by the synchronous rotation, and is driven forward to realize the conveying. Therefore, the welding strip can be flattened in a non-static state, so that the flattening processing efficiency of the welding strip can be significantly improved.

[0067] The following will be combined with the accompanying drawings ( Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ), clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0068] In the example, the rolling mechanism 100 mainly includes two parts, namely a first rotating body 101 and a second rotating body 102. Figure 1 and Figure 3 shown.

[0069] As the name implies, a rotating body refers to a structure that can rotate, and therefore it can be understood that a rotating body has a rotation axis. Taking a cylinder as an example, it can perform rotational motion along the axis (the line connecting the center of the upper base and the center of the lower base).

[0070] For example, the first rotating body 101 and the second rotating body 102 can be configured as structures such as rollers, columnar rods, or cylinders.

[0071] For the convenience of discussion, it can be described as follows: the first rotating body 101 has a first circumferential surface and a first eccentric protrusion 204 protruding from the first circumferential surface, and the second rotating body 102 has a second circumferential surface.

[0072] On the basis of the above structure, the first rotating body 101 and the second rotating body 102 are positioned and configured respectively (for example, the rotation axes of the two are parallel to each other), so that a first gap for driving the pressed object to feed is formed between the second circumferential surface and the first circumferential surface, and a second gap for rolling the pressed object is also formed between the second circumferential surface and the first eccentric convex portion 204.

[0073] Since the second gap is defined by the first eccentric protrusion 204 which protrudes from the first circumferential surface, it can be understood that the first gap is larger than the second gap.

[0074] In this way, by adjusting the distance between the axis of the first rotating body 101 and the axis of the second rotating body 102 (such as the vertical spacing), the specific sizes of the first gap and the second gap can be designed, so that the size of the first gap matches the welding strip 103 (such as being equivalent to / equal to the thickness of the welding strip 103), and the welding strip 103 can be conveyed jointly through the first circumferential surface and the second circumferential surface; and, the size of the second gap matches the welding strip 103 (such as being smaller than the thickness of the welding strip 103), so that the welding strip 103 can be flattened through the second circumferential surface and the first eccentric protrusion 204, and the welding strip 103 can also maintain a conveying state during the flattening process.

[0075] It should be noted that, since the first gap and the second gap have different sizes and different functions, it can be known that during the rotation of the two rotating bodies, the positions of the first gap and the second gap relative to the welding strip 103 are switched cyclically and periodically.

[0076] Therefore, in order to enable both to work continuously, the second rotating body 102 is also configured in the present application so that the second rotating body 102 also has a limited degree of freedom along the direction of the axis connecting the first rotating body 101 and the second rotating body 102 .

[0077] Due to the existence of the limited degree of freedom, during the rolling process of conveying and flattening the welding strip 103 using the rolling mechanism 100, the second rotating body 102 can synchronously maintain the thickness of the first gap and the second gap when forced to move. That is, when flattening the welding strip 103, the thickness of the second gap is at a pre-designed size; correspondingly, when conveying after flattening, the thickness of the first gap is at another pre-designed size.

[0078] Since there are a large number of welding strips 103, in order to improve the flattening efficiency, the first circumferential surface of the first rotating body 101 can be set to multiple (such as at least two) to simultaneously convey and flatten multiple welding strips 103. Therefore, these circumferential surfaces can all participate in conveying the welding strips 103, and correspondingly, multiple first eccentric protrusions can also be correspondingly set, so as to utilize these first eccentric protrusions to flatten and convey the welding strips 103.

[0079] As a configuration mode of these first circumferential surfaces and first eccentric protrusions on the first rotating body 101, they can be selected to be distributed at equal intervals along the axial direction of the first rotating body 101, in other words, they can also be distributed at unequal intervals (such as increasing intervals).

[0080] Furthermore, considering that the first welding strip 103 is narrow, it may slip relative to the two rotating bodies or be difficult to position. Therefore, in some examples, the first rotating body 101 may have a first groove 203 recessed from the outer peripheral surface, the groove bottom surface of the first groove 203 is the first circumferential surface, and the first eccentric convex portion 204 is located in the first groove 203. A beneficial option is that the first groove 203 and the first eccentric convex portion 204 are arranged in pairs, and there are multiple pairs in the rolling mechanism 100 and they are distributed at intervals along the axial direction of the first rotating body 101.

[0081] In this way, when the welding strip 103 is rolled, the welding strip 103 can be embedded in the first groove 203, so that it is axially restricted by the two side walls of the first groove 203, so that shaking and slipping are effectively suppressed and avoided.

[0082] In coordination with the scheme that the first rotating body 101 has a plurality of first eccentric protrusions (or the first grooves 203 matched therewith), in some examples, the number of the second rotating body 102 and the first grooves 203 is set to be the same, and they are arranged in a one-to-one positional correspondence. Further, in some examples, the second rotating body 102 may also have a second eccentric protrusion that protrudes from the second circumferential surface and corresponds to the first eccentric protrusion 204. Therefore, when flattening the welding strip 103, it can be achieved by the coordination of the first eccentric protrusion and the second eccentric protrusion.

[0083] Preferably, in some examples, the second rotating body 102 may also have a second groove recessed from the outer circumferential surface, so the groove bottom surface of the second groove may be set as the aforementioned second circumferential surface, and the matching second eccentric protrusion is located in the second groove.

[0084] The above mainly discusses the structure of the two rotating bodies. Now let’s turn to the discussion of the installation and connection related structures of the two.

[0085] As the mounting structure of the two rotating bodies, and considering the modification of the overall appearance of the rolling mechanism 100 and preventing foreign objects from entering the rolling structure, in some examples, the rolling mechanism 100 includes a base 105 and a top cover 106 connected to each other; accordingly, the first rotating body 101 is connected to the base 105, and the second rotating body 102 is connected to the top cover 106; see Figure 1 and Figure 2 .

[0086] The base 105 and the top cover 106 can be selected to be fixedly connected, or to be detachably connected for maintenance, parts replacement or repair, such as a bolted connection. In order to facilitate the disassembly of the top cover 106, the top cover 106 can be hinged to the base 105. In this way, when the rotating body needs to be processed, it can be considered to flip up the top cover 106 to expose the operating space. In addition, in order to reduce the fluctuation of the top cover 106 or accidental opening, in some examples, the rolling mechanism 100 can also include a buckle 104 (which can be used as a quick-release structure) for locking the base 105 and the top cover 106.

[0087] On the basis of the base 105 and the top cover 106, the devices for driving the two rotating bodies can be installed and positioned accordingly. For example, the rolling mechanism 100 includes a first driver 107 connected to the base 105, and the first driver 107 is in transmission connection with the first rotating body 101, so as to allow the first driver 107 to drive the first rotating body 101 to rotate along its own axis. As an example, the first driver 107 can be implemented as a motor, and is driven and connected to the first rotating body 101 by belt transmission (such as a transmission belt 108) or chain transmission or gear transmission.

[0088] The movement of the second rotating body 102 can be active rotation; or the second rotating body 102 can be driven to rotate passively by the friction force through the movement of the first rotating body 101 and the welding strip 103.

[0089] In addition to considering the installation structure of the first rotating body 101 and the second rotating body 102, when the first rotating body 101 is a long axis, the first rotating body 101 is squeezed downward by the second rotating body 102 for a long time, and it will be found that the downward deformation occurs, resulting in a possible increase in the gap between the two rotating bodies during the rolling process. Although the change in the gap may be small, considering that the welding strip 103 is thin, such a change will also affect the flattening effect of the welding strip 103. Therefore, the two rotating bodies can be supported and configured accordingly.

[0090] See also Figure 2 For example, in some examples, the rolling mechanism 100 includes an elastic member 205, and a first hinged arm 206 connected to the elastic member 205 and hinged to the base 105. The elastic member 205 causes the first hinged arm 206 to be stressed, and the first hinged arm 206 has a tendency to move toward the first rotating body 101, thereby contacting the first rotating body 101, so that the first circumferential surface is not easy to separate from the second rotating body 102.

[0091] In a more specific alternative example, the first articulated arm 206 can be in rolling contact with the first circumferential surface through a rotating portion 207 (which can be described as a fifth roller, for example). In this way, when supporting the first rotating body 101, the first rotating body 101 can also maintain good rotation performance. Optionally, the rolling mechanism 100 can also include a pressing block 208 disposed between the elastic member 205 and the first articulated arm 206, and the elastic member 205 applies force to the first articulated arm 206 through the pressing block 208.

[0092] The supporting structure of the first rotating body 101 is discussed above, and the supporting structure of the second rotating body is discussed below. Figure 2 and Figure 3 For example, the rolling mechanism 100 may include a second hinged arm 209 and a third roller 300 hinged to the top cover 106. Furthermore, the second rotating body 102 is rotatably connected to the first end of the second hinged arm 209, and the third roller 300 is rotatably connected to the second end of the second hinged arm 209. At the same time, the third roller 300 can also be subjected to force, so that the second rotating body 102 abuts against the first rotating body 101.

[0093] Furthermore, the rolling mechanism 100 may also include a sliding assembly. For example, the sliding assembly includes a wedge-shaped sliding member 201 and a second driver 202 and a fourth roller 210 respectively connected to the top cover 106 .

[0094] The wedge-shaped sliding member 201 (or described as a wedge block) is drivenly connected to the driving end of the second driver 202. The fourth roller 210 is in sliding contact with the wedge-shaped sliding member 201, and the wedge-shaped sliding member 201 has an inclined surface, which is in contact with the third roller 300. In this way, the second driver 202 (such as a cylinder, or a gear and rack matching structure) drives the wedge-shaped sliding member 201 to slide horizontally so that the second rotating body 102 and the first rotating body 101 are close to or away from each other. The second driver 202 drives the wedge-shaped sliding member 201 to slide horizontally, and the third roller 300 abutting against the wedge-shaped sliding member 201 will rotate up and down.

[0095] Through the corresponding supporting structures of the two rotating bodies, the thickness of the first gap and the second gap can be better ensured, so that the two rotating bodies can maintain a close contact state during the rolling process, so as to achieve a good flattening and conveying effect.

[0096] Considering the conveying process before the welding ribbon 103 enters the rolling mechanism 100 and after it is separated from the rolling mechanism 100, in order to prevent the posture of the welding ribbon 103 from not meeting the requirements (such as not aligning with the first eccentric protrusion) or deviating (such as deviating from the first eccentric protrusion when leaving the rolling mechanism 100), a guide 401 can be configured in the rolling mechanism 100, see Figure 4 , Figure 5 and Figure 6 The guide 401 is used to guide and regulate the feeding posture of the soldering ribbon 103 to prevent the soldering ribbon 103 from twisting or bending during the forward movement, thereby ensuring that the rolling process of the soldering ribbon 103 can be carried out efficiently and smoothly.

[0097] The guide 401 can be, for example, a flat plate and a guide track groove formed by a plurality of vertical plates arranged thereon. Or it can be a plurality of flat groove tubes. In the structure shown in the drawings of the present application, the guide 401 has a support plate 402 and a cover plate 403, which are arranged face to face and face to face, and a space for the welding strip 103 to move forward is formed between the two. Therefore, the support plate 402 and the cover plate 403 jointly provide a constrained gap to guide the pressed object to move toward between the first rotating body 101 and the second rotating body 102. For example, the two form a limiting groove 404 for the welding strip 103 to fit through.

[0098] Considering the direction of entry or exit relative to the rolling mechanism 100, the welding strip 103 can be guided at these positions. Therefore, there can be two guides 401 in the rolling mechanism 100, and therefore they are respectively located on both sides of the first rotating body 101 and the second rotating body 102 in the rolling direction; the two guides 401 can have the same structure, or be constructed differently according to the specific design of the rolling mechanism 100 to form different structures.

[0099] The above description provides a detailed and comprehensive discussion of the rolling mechanism 100 in the present application. Therefore, those skilled in the art can implement the rolling mechanism 100 of the present application example based on these contents, and use it to flatten the welding strip 103 by rolling, and the flattening quality is high and the efficiency is also high.

[0100] Furthermore, in an application example of the rolling mechanism 100, the present application also discloses a welding strip shaping device, which includes the rolling mechanism 100 and a mechanism for fixing the welding strip 103 (which may be provided in a roll form) and can be tensioned and transported by a wheel group.

[0101] Correspondingly, the shaping device may also include a coil assembly for storing the solder strip to be flattened. The solder strip to be flattened is wound in the coil assembly, and the solder strip to be flattened is continuously taken out and flattened by the rolling mechanism 100 .

[0102] Correspondingly, the shaping device may also guide and transport the solder strip 103 that has undergone the flattening operation to a station where the solder strip 103 is used.

[0103] In addition, a power supply device may be configured in the device to provide power to the driver in the rolling mechanism 100. Alternatively, various devices or instruments may be configured as required.

[0104] Furthermore, a photovoltaic cell string welding machine can be formed, which includes a rolling mechanism 100, or a welding strip shaping device.

[0105] In order to perform welding, the photovoltaic cell string welding machine can be equipped with a welding device, an optical recognition device, a cell conveying device, etc., which are used to weld the flattened welding ribbon and the cell into a cell string.

[0106] In summary, the present application discloses a processing tool for realizing a soldering strip used in string soldering of photovoltaic cells, which can achieve higher processing efficiency and regularly flatten the soldering strip at multiple designated positions with high quality to meet the requirements of the welding operation.

[0107] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0108] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "length", "width", "thickness", "top", "bottom", "inside", "outside", "axial", "circumferential", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0109] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0110] Although multiple embodiments of the utility model have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted. The attached claims are intended to define the scope of protection of the utility model, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A rolling mechanism, characterized in that: include: a first rotating body and a second rotating body; The first rotating body has a first circumferential surface and a first eccentric protrusion protruding from the first circumferential surface; The second rotating body has a second circumferential surface, a first gap for driving the pressed object to feed is formed between the second circumferential surface and the first circumferential surface, a second gap for rolling the pressed object is formed between the second circumferential surface and the first eccentric convex portion, and the first gap is larger than the second gap; The second rotating body also has a limited degree of freedom along the direction of the axis connecting the first rotating body and the second rotating body, so that the second rotating body can synchronously maintain the thickness of the first gap and the second gap when forced to move during the rolling process.

2. The rolling mechanism according to claim 1, characterized in that: The rolling mechanism comprises a base, and the first rotating body and the second rotating body are connected to the base; And / or, there are multiple first circumferential surfaces, which are evenly distributed along the axial direction of the first rotating body.

3. The rolling mechanism according to claim 1, characterized in that: The first rotating body has a first groove recessed from the outer peripheral surface, the groove bottom surface of the first groove is the first circumferential surface, and the first eccentric protrusion is located in the first groove.

4. The rolling mechanism according to claim 3, characterized in that: The first groove and the first eccentric convex portion are arranged in pairs, and there are a plurality of pairs in the rolling mechanism and they are distributed at intervals along the axial direction of the first rotating body.

5. The rolling mechanism according to claim 4, characterized in that: The number of the second rotating bodies is the same as that of the first grooves, and they are arranged in a one-to-one correspondence.

6. The rolling mechanism according to claim 1, 3, 4 or 5, characterized in that: The second rotating body has a second eccentric convex portion that protrudes from the second circumferential surface and corresponds to the first eccentric convex portion.

7. The rolling mechanism according to claim 6, characterized in that: The second rotating body has a second groove recessed from the outer peripheral surface, the groove bottom surface of the second groove is the second circumferential surface, and the second eccentric convex portion is located in the second groove.

8. The rolling mechanism according to claim 1, characterized in that: The rolling mechanism comprises a base and a top cover which are connected to each other, the first rotating body is connected to the base, and the second rotating body is connected to the top cover.

9. The rolling mechanism according to claim 8, characterized in that: The base and the top cover are detachably connected; and / or, the top cover is hinged to the base; and / or, the rolling mechanism includes a buckle for locking the base and the top cover.

10. The rolling mechanism according to claim 8 or 9, characterized in that: The rolling mechanism includes a first driver connected to the base, the first driver is drivingly connected to the first rotating body, and the first driver is used to drive the first rotating body to rotate along its own axis.

11. The rolling mechanism according to claim 10, characterized in that: The first driver is a motor, and is driven and connected to the first rotating body by means of belt transmission or chain transmission.

12. The rolling mechanism according to claim 8, characterized in that: The rolling mechanism comprises a first hinged arm connected to an elastic member and hinged to a base, wherein the elastic member causes the first hinged arm to be subjected to force so as to abut against a first circumferential surface of a first rotating body.

13. The rolling mechanism according to claim 12, characterized in that: The first articulated arm is in rolling contact with the first circumferential surface through the rotating portion; And / or, the rolling mechanism includes a pressing block arranged between the elastic member and the first hinged arm, and the elastic member applies force to the first hinged arm through the pressing block.

14. The rolling mechanism according to claim 8, characterized in that: The rolling mechanism includes a second hinged arm and a third roller hinged to the top cover, the second rotating body is rotatably connected to the first end of the second hinged arm, the third roller is rotatably connected to the second end of the second hinged arm, and the third roller is subjected to force to make the second rotating body abut against the first rotating body.

15. The rolling mechanism according to claim 14, characterized in that: The rolling mechanism comprises a sliding assembly, and the sliding assembly comprises a wedge-shaped sliding member and a second driver and a fourth roller respectively connected to the top cover; The wedge-shaped sliding member is drivenly connected to the driving end of the second driver, the fourth roller is in sliding contact with the wedge-shaped sliding member, the inclined surface of the wedge-shaped sliding member is in abutment with the third roller, and the second driver drives the wedge-shaped sliding member to slide horizontally to make the second rotating body approach or move away from the first rotating body.

16. The rolling mechanism according to claim 1, characterized in that: The rolling mechanism comprises a guide having a support plate and a cover plate, wherein the support plate and the cover plate jointly provide a constraining gap to guide the pressed object to move toward between the first rotating body and the second rotating body.

17. The rolling mechanism according to claim 16, characterized in that: There are two guides, which are respectively located on both sides of the first rotating body and the second rotating body in the rolling direction.

18. The rolling mechanism according to claim 1, characterized in that: The first rotating body and the second rotating body are rollers or columnar rods.

19. A welding strip shaping device, characterized in that: The invention comprises the rolling mechanism as claimed in any one of claims 1 to 18.

20. A photovoltaic cell string welding machine, characterized in that: It comprises the rolling mechanism described in any one of claims 1 to 18, or the welding strip shaping device described in claim 19.

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