Solder strip temporary storage mechanism and solder strip feeding device

Abstract

The utility model provides a solder strip temporary storage device and a solder strip feeding device, the solder strip temporary storage device comprises a mounting frame, n connecting plates, a limiting frame and n buffer assemblies, each connecting plate is rotatably provided with a roller, and the n buffer assemblies are arranged above the n connecting plates in a one-to-one correspondence manner; the buffering assembly comprises a guide rod and a spring, the guide rod is installed on the limiting frame in an up-down sliding mode, the lower end of the guide rod is located below the limiting frame, and the guide rod is sleeved with the spring; the guide rod is used for abutting against the connecting plate when the connecting plate moves upwards to a preset position and moving upwards under the pushing of the connecting plate, and the guide rod is further used for extruding the spring when the guide rod begins to move upwards or extruding the spring after the guide rod moves upwards for a certain distance; wherein n is greater than or equal to 2. And the rising connecting plate is buffered through the guide rod and the spring, so that the roller can tend to stop when the traction mechanism stops, the upward moving amplitude of the roller due to inertia when the traction mechanism stops is reduced, and the roller can better tension the welding strip and prevent the welding strip from shaking.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic cell production equipment, in particular to a welding strip buffering mechanism and a welding strip feeding device. BACKGROUND

[0002] The photovoltaic cell string welding equipment is used for connecting the cell pieces in series through the welding strip to prepare the cell string, wherein the welding strip feeding device is an important component of the photovoltaic cell string welding equipment and is used for providing the welding strip, and generally comprises a traction mechanism, a buffering mechanism and a unwinding mechanism. The traditional buffering mechanism mainly comprises a roller which can move up and down and a first guide wheel and a second guide wheel which are located above the roller. The welding strip unwound by the unwinding mechanism passes through the first guide wheel, the roller and the second guide wheel in turn and is clamped by the traction mechanism. The traction mechanism pulls out a certain length of the welding strip each time and stops. After the welding strip is cut, the next pulling is carried out. In the process of pulling the welding strip, the roller can adjust the buffering amount of the welding strip by moving up and down when the pulling speed is inconsistent with the unwinding speed, so that the welding strip is kept in tension.

[0003] With the increasing production capacity of the string welding equipment, the pulling speed of the welding strip by the traction mechanism is faster and faster. When the traction mechanism stops after pulling out the welding strip each time, the roller will continue to move upward due to inertia, resulting in the disconnection between the welding strip and the contact surface of the roller and the loss of tension, which causes the welding strip to vibrate. CONTENT OF THE UTILITY MODEL

[0004] In view of the above technical problems, the present application provides a welding strip buffering mechanism, and the detailed technical scheme is as follows:

[0005] A welding strip buffering mechanism comprises:

[0006] a mounting frame;

[0007] n connecting plates which are slidably installed on the mounting frame, one roller is rotatably installed on each connecting plate, and the n rollers are arranged side by side along a first direction, and a first guide wheel and a second guide wheel are respectively arranged above each roller;

[0008] a limiting frame and n buffer assemblies, the limiting frame is installed on the mounting frame, the n buffer assemblies are installed side by side on the limiting frame along the first direction, and are respectively arranged above the n connecting plates; the buffer assembly comprises a guide rod and a spring, the guide rod is slidably installed on the limiting frame and located below the limiting frame at the lower end, and the spring is sleeved on the guide rod; the guide rod is used for abutting against the connecting plate when the connecting plate moves upward to a predetermined position, and moving upward under the pushing of the connecting plate, and the guide rod is used for extruding the spring when starting to move upward, or extruding the spring after moving upward for a distance;

[0009] wherein n is greater than or equal to 2.

[0010] The welding strip buffering mechanism provided by the application is used for buffering the welding strip, the roller for buffering the welding strip is installed on the connecting plate, the buffering assembly is arranged at a certain height above the connecting plate, and the roller drives the connecting plate to move upward under the action of inertia during deceleration of the external traction mechanism. The connecting plate can abut against the guide rod in the buffering assembly and push the guide rod to move upward. In the case that the guide rod extrudes the spring when starting to move upward, the force of the guide rod on the connecting plate increases continuously with the increasing compression amount of the spring, the kinetic energy of the upward movement of the roller can be consumed quickly, the braking of the roller is accelerated, the roller can stop when the traction mechanism stops, the amplitude of the upward movement of the roller due to inertia when the traction mechanism stops is reduced, the welding strip can be tensioned better by the roller, and the welding strip is prevented from shaking; in the case that the guide rod extrudes the spring after moving upward for a distance, the case is especially suitable for different situations of different upward movement heights of the roller. At this time, the connecting plate in the high position in each connecting plate abuts against the corresponding guide rod first, pushes the guide rod to move upward, and does not compress the spring, so that the connecting plate consumes part of the kinetic energy under the buffering of the uniform force of the guide rod, and then the spring is compressed to brake quickly, which can avoid the situation that the connecting plate in the high position compresses the spring when the buffering starts, the downward force of the spring on the corresponding connecting plate is increased due to the excessive compression amount, and the roller on the connecting plate is broken.

[0011] In some embodiments, the limiting frame is provided with n guide holes for sliding of the guide rods, the upper end of the guide rod is connected with the first limiting part after passing through the corresponding guide hole, the lower end of the guide rod is provided with a second limiting part, and the spring is sleeved on the guide rod between the limiting frame and the second limiting part.

[0012] By arranging the guide holes, the upward and downward movement of the guide rod is guided, the first limiting part can keep the guide rod on the limiting frame and prevent the guide rod from falling out of the guide hole, and the second limiting part can be matched with the limiting frame to compress the spring.

[0013] In some embodiments, when the first limiting part contacts with the limiting frame, the length of the guide rod between the limiting frame and the second limiting part is a first length, and the length of the spring in a natural state is a second length, wherein:

[0014] The first length is equal to the second length, the upper end of the spring abuts against the limiting frame, and the lower end of the spring abuts against the second limiting part; or,

[0015] The first length is greater than the second length, the upper end of the spring is a free end, and the lower end of the spring abuts against the second limiting part; or,

[0016] The first length is greater than the second length, the upper end of the spring is installed on the limiting frame, and the lower end of the spring is a free end.

[0017] Three optional spring installation methods are provided. When the first length is equal to the second length, the spring can be compressed when the guide rod begins to move upward. When the first length is greater than the second length, the spring can be compressed after the guide rod has moved upward a certain distance.

[0018] In some embodiments, the second length is at least 45% of the first length.

[0019] The spring length cannot be too short, otherwise it will not be able to achieve a good rapid braking effect.

[0020] In some embodiments, the limiting frame includes a horizontal limiting plate and two side plates, the two side plates being fixedly mounted on the mounting frame, the two ends of the horizontal limiting plate being fixedly connected to the two side plates respectively, and a guide hole being provided on the horizontal limiting plate; the mounting height of the horizontal limiting plate on the side plates is adjustable, and / or the mounting position of the horizontal limiting plate in a first direction is adjustable.

[0021] By making the horizontal limiting plate height adjustable, the installation height of the guide rod can be adjusted, which facilitates adjusting the contact timing between the connecting plate and the guide rod according to the actual production process parameters, and achieves timely buffering of the connecting plate; by making the horizontal position of the horizontal limiting plate adjustable, the horizontal installation position of the guide rod can be adjusted, which facilitates the alignment of the guide rod with the corresponding connecting plate, and ensures accurate contact with the connecting plate when it rises.

[0022] In some embodiments, multiple first mounting holes are provided at intervals along the height direction on the two side plates. The first mounting holes are round holes or threaded holes. The first mounting holes at the same height are a group. Second mounting holes are provided at both ends of the horizontal limiting plate. Fasteners pass through the second mounting holes and are installed in the first mounting holes of the same group to fix the horizontal limiting plate to the side plates. Alternatively, vertical waist holes are provided on the two side plates. Second mounting holes are provided at both ends of the horizontal limiting plate. Bolts pass through the second mounting holes and the vertical waist holes and are screwed into the nuts to fix the horizontal limiting plate to the side plates.

[0023] Two optional methods for adjusting the height of the horizontal limit plate are provided. The structure is simple and the adjustment is convenient and quick.

[0024] In some embodiments, the second mounting hole is a waist hole extending along the first direction.

[0025] By designing the second mounting hole as a waist hole extending along the first direction, the horizontal position of the horizontal limiting plate can be quickly and flexibly adjusted.

[0026] In some embodiments, the mounting bracket is provided with n vertical slide rails, and n connecting plates are respectively mounted on the n vertical slide rails one by one by sliders.

[0027] The vertical slide rails guide the lifting and lowering of the connecting plate, ensuring a smooth and stable process.

[0028] In some embodiments, a trigger rod is fixedly mounted on each connecting plate, and a sensor is mounted on the bottom of the mounting bracket on the moving path of each trigger rod. The trigger rod is used to trigger the corresponding sensor when the corresponding roller descends to a preset low position.

[0029] By setting up the trigger lever and sensor, it is possible to limit the downward movement of the roller.

[0030] This application also provides a welding strip feeding device, including a traction mechanism, n unwinding mechanisms, and a welding strip buffer mechanism as described above, wherein:

[0031] The unwinding mechanism, the welding strip buffer mechanism, and the traction mechanism are arranged sequentially along the traction path of the welding strip;

[0032] Each unwinding mechanism is used to release one strip of solder, and the n strips of solder correspond one-to-one with the n rollers of the strip buffer mechanism;

[0033] Each welding strip passes sequentially around the corresponding first guide wheel, roller, and second guide wheel, and is held together by the traction mechanism;

[0034] The traction mechanism is used to pull n welding strips out of each unwinding mechanism to a predetermined length;

[0035] The guide rod is used to abut against the corresponding connecting plate when the corresponding connecting plate moves upward to a predetermined position.

[0036] The welding strip feeding device provided in this application can reduce the upward movement of the roller due to inertia when the traction mechanism stops, so that the roller can better tension the welding strip and prevent the welding strip from shaking. Attached Figure Description

[0037] Figure 1 This is a side view of the solder strip buffer mechanism in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the solder strip buffer mechanism in the embodiments of this application from a first-view perspective;

[0039] Figure 3 This is a schematic diagram of the solder strip buffer mechanism in an embodiment of this application from a second perspective.

[0040] Figure 4 This is a schematic diagram of the trigger rod and sensor of the solder strip buffer mechanism in the embodiments of this application;

[0041] Figure 5 This is a schematic diagram showing the state in which n rollers of the ribbon buffer mechanism in this embodiment are at the same height;

[0042] Figure 6 This is a schematic diagram showing the n rollers of the ribbon buffer mechanism in this embodiment of the application at different heights;

[0043] Figures 1 to 6 Includes:

[0044] Mounting bracket 1, connecting plate 2, roller 3, first guide wheel 4, second guide wheel 5, limiting bracket 6, horizontal limiting plate 61, second mounting hole 611, side plate 62, first mounting hole 621, buffer assembly 7, guide rod 71, second limiting part 711, spring 72, first limiting part 8, vertical slide rail 9, trigger rod 10, sensor 11, traction mechanism 12, unwinding mechanism 13, welding strip 14. Detailed Implementation

[0045] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] like Figures 1 to 6 As shown, the solder ribbon buffer mechanism provided in this application embodiment includes:

[0047] Mounting bracket 1;

[0048] n connecting plates 2, n ≥ 2, are slidably mounted on the mounting frame 1. Each connecting plate 2 is rotatably mounted with a roller 3. The n rollers 3 move along a first direction (e.g., ...). Figure 2 The rollers (in the X direction) are arranged side by side, with a first guide wheel 4 and a second guide wheel 5 respectively above each roller 3. For simplicity of illustration, Figure 1 and Figure 2 Only one set of first guide wheels 4 and second guide wheels 5 are shown in the diagram;

[0049] The system includes a limiting frame 6 and n buffer components. The limiting frame 6 is mounted on the mounting frame 1, and the n buffer components are mounted side by side on the limiting frame 6 along a first direction, and are positioned above the n connecting plates 2 respectively. Each buffer component includes a guide rod 71 and a spring 72. The guide rod 71 is slidably mounted on the limiting frame 6 with its lower end located below the limiting frame 6. The spring 72 is fitted onto the guide rod 71. The guide rod 71 is used to abut against the connecting plate 2 when the connecting plate 2 moves upward to a predetermined position, and moves upward under the push of the connecting plate 2. The guide rod 71 is also used to compress the spring 72 when it begins to move upward, or to compress the spring 72 after moving upward a certain distance.

[0050] Among them, the n guide rods 71 ​​are of the same length. After being installed on the limit frame 6, the bottom height of each guide rod 71 is the same when it is in a natural, unloaded state.

[0051] The installation height of the guide rod 71 can be selected and set according to the actual unwinding speed and traction speed of the welding strip.

[0052] When using the welding strip buffer mechanism of this application embodiment, n welding strips are released by their respective unwinding mechanisms, sequentially passing around the corresponding first guide wheel 4, roller 3, and second guide wheel 5, and then jointly held by an external traction mechanism. Each time the traction mechanism pulls the welding strip, it typically goes through an acceleration phase, a constant speed phase, and a deceleration phase. The deceleration of the traction mechanism is usually achieved by motor braking, and the deceleration speed is very fast. To ensure that the roller 3 also tends to stop when the traction mechanism stops, and to prevent the roller 3 from jumping up significantly due to inertia, in this application embodiment, a buffer assembly is provided at a certain height above each connecting plate 2. During the deceleration process of the external traction mechanism, when the roller 3 drives the connecting plate 2 upward under the action of inertia, the connecting plate 2 can abut against the guide rod 71 in the buffer assembly and push the guide rod 71 upward.

[0053] When the guide rod 71 compresses the spring 72 as it begins to move upward, as the compression of the spring 72 increases, the force exerted by the guide rod 71 on the connecting plate 2 increases. This can quickly dissipate the kinetic energy of the roller 3 as it rises, accelerate the braking of the roller 3, and allow the roller 3 to stop as soon as the traction mechanism stops. This reduces the upward movement of the roller 3 due to inertia when the traction mechanism stops, allowing the roller 3 to better tension the welding strip and prevent the welding strip from shaking.

[0054] Figure 5 and Figure 6 The diagram shows two possible stopping positions of the n rollers 3 after one welding strip traction operation.

[0055] Figure 5 After the welding strip traction is completed, the height of the n rollers 3 is the same. Therefore, in the next welding strip traction process, the n connecting plates 2 where the n rollers 3 are located can simultaneously abut against the corresponding guide rods 71, thereby compressing the springs 72 to implement braking.

[0056] Figure 6After the welding strip traction is completed, the heights of the n rollers 3 are inconsistent, with some high and some low. The height difference of the n rollers 3 is mainly caused by the difference in the unwinding speed of the n welding strips. If the guide rod 71 is still squeezed by the spring 72 when it begins to move upward, then in the next welding strip traction process, the connecting plate 2 where the roller 3 at the highest position is located will first abut against the corresponding guide rod 71, that is, compress the spring 72 first. After all n rollers 3 have stopped, the compression of the n springs 72 will be different. That is, the compression of the spring 72 corresponding to the roller 3 at the highest position will be the largest, and the compression of the spring 72 corresponding to the roller 3 at the lowest position will be the smallest. The spring 72 with the largest compression will exert the largest downward pressure on the corresponding connecting plate 2. When the welding strip is thin, the tension of the welding strip on the roller 3 on the connecting plate 2 will be the largest, which is prone to the risk of the welding strip breaking.

[0057] Therefore, for different rollers 3 stopping at different heights, the guide rod 71 can be moved upwards a certain distance and then squeezed to compress the spring 72. This allows the connecting plate 2 at the higher position to abut against the corresponding guide rod 71 and push the guide rod 71 upwards without compressing the spring 72. This allows the connecting plate 2 to first consume some kinetic energy under the buffering force of the guide rod 71, and then compress the spring 72 for rapid braking. This avoids the connecting plate 2 at the higher position compressing the spring 72 at the beginning of the buffering process, which would cause the spring 72 to increase the downward force on the corresponding connecting plate 2 due to excessive compression, thereby causing the roller 3 on the connecting plate 2 to break off the welding strip.

[0058] Optionally, the guide rod 71 compresses the spring 72 after moving upward a certain distance, where "a certain distance" can be determined based on the height difference between the highest and lowest rollers 3 (e.g., ...). Figure 6 The H in the middle is set so that the height difference of the roller 3 can be offset by the upward movement of the guide rod 71 alone, so that the connecting plate 2 where the roller 3 is located at the highest position can delay the pressure on the corresponding spring 72, reduce the final compression of the spring 72, and thus prevent the welding strip on the roller 3 at the highest position from breaking off.

[0059] In some embodiments, such as Figure 5 As shown, the limiting frame 6 is provided with n guide holes for each guide rod 71 to slide through. The upper end of the guide rod 71 passes through the corresponding guide hole and is connected to the first limiting part 8. The lower end of the guide rod 71 is provided with a second limiting part 711. The spring 72 is fitted on the guide rod 71 located between the limiting frame 6 and the second limiting part 711.

[0060] By setting a guide hole, the guide rod 71 is guided to move up and down. The first limiting part 8 can hold the guide rod 71 on the limiting frame 6 to prevent the guide rod 71 from falling out of the guide hole. The setting of the second limiting part 711 can cooperate with the limiting frame 6 to compress the spring 72.

[0061] Optionally, the upper end of the guide rod 71 has a short threaded section, and the section between the threaded section and the second limiting part 711 is a smooth section. The first limiting part 8 is a nut, and the upper end of the guide rod 71 passes through the guide hole and is screwed to the nut. The second limiting part 711 is integrally formed with the guide rod 71 or is detachably connected.

[0062] Of course, in addition to the threaded connection mentioned above, the connection between the first limiting part 8 and the guide rod 71 can also be achieved by snap-fit ​​connection, pin connection, or other connection methods, as long as the guide rod 71 can be limited and prevented from falling out of the guide hole.

[0063] Optionally, in order to improve the guiding effect on the guide rod 71, a bushing can be built into the guide hole, and the guide rod 71 slides through the bushing.

[0064] In some embodiments, such as Figure 5 As shown, when the first limiting part 8 contacts the limiting frame 6, the length of the guide rod 71 located between the limiting frame 6 and the second limiting part 711 is the first length A, and the length of the spring 72 in its natural state is the second length B, wherein:

[0065] The first length A is equal to the second length B, the upper end of the spring 72 abuts against the limiting bracket 6, and the lower end of the spring 72 abuts against the second limiting part 711; or,

[0066] The first length A is greater than the second length B. The upper end of the spring 72 is a free end, and the lower end of the spring 72 abuts against the second limiting part 711 (e.g., Figure 5 (as shown); or,

[0067] The first length A is greater than the second length B. The upper end of the spring 72 is mounted on the limit frame 6, and the lower end of the spring 72 is a free end.

[0068] Three optional installation methods for the spring 72 are provided. When the first length A is equal to the second length B, the spring 72 can be compressed when the guide rod 71 begins to move upward. When the first length A is greater than the second length B, the spring 72 can be compressed after the guide rod 71 has moved upward a certain distance.

[0069] In some embodiments, the second length B is at least 45% of the first length A, and the length of the spring 72 cannot be too short, otherwise it will not be able to achieve a good rapid braking effect.

[0070] In some embodiments, such as Figure 3 and Figure 5As shown, the limiting frame 6 includes a horizontal limiting plate 61 and two side plates 62. The two side plates 62 are respectively fixedly installed on the mounting frame 1. The two ends of the horizontal limiting plate 61 are respectively fixedly connected to the two side plates 62. The guide hole is provided on the horizontal limiting plate 61. The installation height of the horizontal limiting plate 61 on the side plates 62 is adjustable, and / or the installation position of the horizontal limiting plate 61 in the first direction is adjustable.

[0071] By making the horizontal limiting plate 61 height adjustable, the installation height of the guide rod 71 can be adjusted, which facilitates the adjustment of the contact timing between the connecting plate 2 and the guide rod 71 according to the actual production process parameters, and realizes timely buffering of the connecting plate 2. By making the horizontal limiting plate 61 horizontally adjustable, the horizontal installation position of the guide rod 71 can be adjusted, which facilitates the alignment of the guide rod 71 with the corresponding connecting plate 2, and accurate contact with it when the connecting plate 2 rises.

[0072] Continue to refer to Figure 3 In some embodiments, multiple first mounting holes 621 are provided at intervals along the height direction on the two side plates 62. The first mounting holes 621 are round holes or threaded holes. The first mounting holes 621 at the same height are a group. The two ends of the horizontal limiting plate 61 are respectively provided with second mounting holes 611. Fasteners (such as bolts or screws) pass through the second mounting holes 611 and are installed in the first mounting holes 621 in the same group to fix the horizontal limiting plate 61 on the side plate 62.

[0073] In some embodiments, vertical waist holes are provided on the two side plates 62 respectively, and second mounting holes 611 are provided at both ends of the horizontal limiting plate 61 respectively. After the bolt passes through the second mounting holes 611 and the vertical waist holes, it is screwed with a nut to fix the horizontal limiting plate 61 on the side plate 62.

[0074] Continue to refer to Figure 3 In some embodiments, the second mounting hole 611 is a slotted hole extending along the first direction. By designing the second mounting hole 611 as a slotted hole extending along the first direction, the horizontal position of the horizontal limiting plate 61 can be quickly and flexibly adjusted.

[0075] In some embodiments, such as Figure 2 and Figure 3 As shown, the mounting bracket 1 is equipped with n vertical slide rails 9, and n connecting plates 2 are respectively installed on the n vertical slide rails 9 one by one through sliders.

[0076] The vertical slide rail 9 is designed to guide the lifting and lowering process of the connecting plate 2, making the lifting and lowering process smooth and stable.

[0077] In some embodiments, such as Figure 4As shown, each connecting plate 2 is fixedly installed with a trigger rod 10, and the bottom of the mounting bracket 1 is equipped with a sensor 11 on the moving path of each trigger rod 10. The trigger rod 10 is used to trigger the corresponding sensor 11 when the corresponding roller 3 descends to a preset low position.

[0078] When the trigger rod 10 triggers the sensor 11, it sends a signal to the controller. The controller then controls the corresponding solder strip roll to stop unwinding, thereby stopping the corresponding roller 3 from descending. Therefore, by setting the trigger rod 10 and the sensor 11, the downward movement of the roller 3 can be restricted.

[0079] like Figure 1 As shown, this application also provides a welding strip feeding device, including a traction mechanism 12, n unwinding mechanisms 13, and the aforementioned welding strip buffer mechanism, wherein:

[0080] The unwinding mechanism 13, the welding strip buffer mechanism, and the traction mechanism 12 are arranged sequentially along the traction path of the welding strip;

[0081] Each unwinding mechanism 13 is used to release one strip of solder, and the n strips of solder correspond one-to-one with the n rollers 3 of the strip buffer mechanism;

[0082] Each welding strip passes sequentially around the corresponding first guide wheel 4, roller 3 and second guide wheel 5, and is held together by the traction mechanism 12;

[0083] The traction mechanism 12 is used to pull n welding strips out of each unwinding mechanism 13 by a predetermined length;

[0084] The guide rod 71 is used to abut against the corresponding connecting plate 2 when the corresponding connecting plate 2 moves upward to a predetermined position.

[0085] Optionally, by controlling the installation height of the guide rod 71, the connecting plate 2 can abut against the guide rod 71 when the traction mechanism 12 decelerates. This allows the connecting plate 2 to stop rising when the traction mechanism 12 stops, thereby reducing the upward movement of the roller 3 due to inertia when the traction mechanism 12 stops. This allows the roller 3 to better tension the welding strip and prevent the welding strip from shaking.

[0086] The foregoing has provided a sufficiently detailed and specific description of this application. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of this application should fall within the protection scope of this application. The scope of protection claimed in this application is defined by the claims, and not by the above descriptions in the embodiments.

Claims

1. A solder strip buffer mechanism, characterized in that: The solder strip buffer mechanism includes: Mounting rack; n connecting plates that can be slidably mounted on the mounting frame, each connecting plate having a roller rotatably mounted on it, the n rollers being arranged side by side along a first direction, and each roller having a first guide wheel and a second guide wheel respectively above it; The system includes a limiting frame and n buffer components. The limiting frame is mounted on the mounting frame, and the n buffer components are mounted side-by-side on the limiting frame along the first direction, corresponding one-to-one above the n connecting plates. Each buffer component includes a guide rod and a spring. The guide rod is slidably mounted on the limiting frame with its lower end below the limiting frame, and the spring is fitted onto the guide rod. The guide rod is used to abut against the connecting plate when the connecting plate moves upward to a predetermined position and moves upward under the push of the connecting plate. The guide rod is also used to compress the spring when it begins to move upward, or to compress the spring after moving upward a certain distance. Where n≥2.

2. The solder strip buffer mechanism as described in claim 1, characterized in that: The limiting frame is provided with n guide holes for each guide rod to slide through. The upper end of the guide rod passes through the corresponding guide hole and is connected to the first limiting part. The lower end of the guide rod is provided with a second limiting part. The spring is fitted on the guide rod located between the limiting frame and the second limiting part.

3. The solder strip buffer mechanism as described in claim 2, characterized in that: When the first limiting part contacts the limiting frame, the length of the guide rod located between the limiting frame and the second limiting part is a first length, and the length of the spring in its natural state is a second length, wherein: The first length is equal to the second length, the upper end of the spring abuts against the limiting frame, and the lower end of the spring abuts against the second limiting part; or, The first length is greater than the second length, the upper end of the spring is a free end, and the lower end of the spring abuts against the second limiting part; or, The first length is greater than the second length, the upper end of the spring is mounted on the limiting frame, and the lower end of the spring is a free end.

4. The solder strip buffer mechanism as described in claim 3, characterized in that: The second length is at least 45% of the first length.

5. The solder strip buffer mechanism as described in any one of claims 2 to 4, characterized in that: The limiting frame includes a horizontal limiting plate and two side plates. The two side plates are respectively fixedly installed on the mounting frame. The two ends of the horizontal limiting plate are respectively fixedly connected to the two side plates. The guide hole is provided on the horizontal limiting plate. The installation height of the horizontal limiting plate on the side plate is adjustable, and / or the installation position of the horizontal limiting plate in the first direction is adjustable.

6. The solder strip buffer mechanism as described in claim 5, characterized in that: The two side plates are provided with a plurality of first mounting holes spaced apart along the height direction. The first mounting holes are either round or threaded. First mounting holes at the same height form a group. The horizontal limiting plate has second mounting holes at both ends. Fasteners pass through the second mounting holes and are installed in the first mounting holes of the same group to fix the horizontal limiting plate to the side plates; or... Vertical waist holes are provided on the two side plates respectively, and second mounting holes are provided at both ends of the horizontal limiting plate respectively. After the bolt passes through the second mounting holes and the vertical waist holes, it is screwed into the nut to fix the horizontal limiting plate on the side plates.

7. The solder strip buffer mechanism as described in claim 6, characterized in that: The second mounting hole is a waist hole extending along the first direction.

8. The solder strip buffer mechanism as described in any one of claims 1 to 4, characterized in that: The mounting bracket is provided with n vertical slide rails, and the n connecting plates are respectively installed on the n vertical slide rails one by one by sliders.

9. The solder strip buffer mechanism as described in any one of claims 1 to 4, characterized in that: Each of the connecting plates is fixedly mounted with a trigger rod, and a sensor is mounted on the bottom of the mounting bracket on the moving path of each trigger rod. The trigger rod is used to trigger the corresponding sensor when the corresponding roller descends to a preset low position.

10. A welding strip feeding device, characterized in that: The welding strip feeding device includes a traction mechanism, n unwinding mechanisms, and a welding strip buffer mechanism as described in any one of claims 1 to 9, wherein: The unwinding mechanism, the welding strip buffer mechanism, and the traction mechanism are arranged sequentially along the traction path of the welding strip; Each of the unwinding mechanisms is used to release one strip of solder, and the n strips of solder correspond one-to-one with the n rollers of the strip buffer mechanism; Each welding strip sequentially passes around the corresponding first guide wheel, the roller, and the second guide wheel, and is held together by the traction mechanism; The traction mechanism is used to pull n welding strips out of each of the unwinding mechanisms by a predetermined length; The guide rod is used to abut against the corresponding connecting plate when the corresponding connecting plate moves upward to a predetermined position.

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