A flipping device for rolling solder paste on the front and back sides of heat exchanger fins

Abstract

The present invention discloses a flipping device for heat exchanger fins coated with solder paste on both sides, and relates to the technical field of flipping devices. The flipping device for heat exchanger fins coated with solder paste on both sides comprises: a clamping portion for clamping the conveyed fins, with a first clamping arm and a second clamping arm arranged alternately; a rotating portion, which controls the clamping portion to flip 180° clockwise or counterclockwise via a rotating shaft; a buffer portion for reducing the impact force on the fins during flipping, with the buffer portion arranged between the rotating portion and the conveying platform; and a stretching portion, which tilts the second clamping arm after flipping through inertia and elasticity, and cooperates with the buffer portion to guide the fins to slide along an inclined surface onto the conveying platform. The flipping device for heat exchanger fins coated with solder paste on both sides clamps the fins through the clamping portion and flips them 180°. During the flipping process, the buffer portion reduces the instantaneous impact force on the fins, and the second clamping arm and the bow-shaped ring plate form an inclined surface to guide the fins to slide onto the conveying platform.

Description

Technical Field

[0001] The invention relates to the technical field of flipping devices, and in particular to a flipping device for rolling solder paste on the front and back surfaces of heat exchanger fins. Background Art

[0002] The battery packs, motors and electronic equipment of new energy vehicles generate a lot of heat during operation. The heat exchanger fins can greatly increase the heat dissipation area of the heat exchanger, speed up the heat exchange rate, and help maintain the temperature balance of the thermal management system of new energy vehicles.

[0003] Heat exchanger fins are typically made of materials like aluminum alloy to achieve better thermal conductivity. While these materials offer excellent thermal conductivity, they are relatively brittle, especially at stress-concentrated areas like corners and thinning points. Both sides of the heat exchanger fins require soldering. After soldering one side, the fins need to be rotated 180° and the other side processed.

[0004] Chinese patent publication number: CN108674940B, a flipping and transporting device includes a base assembly, a flipping and transporting assembly, a feeding assembly, a belt transmission assembly and a feeding assembly. The device realizes the flipping and transporting of the plate while realizing the flipping of the plate through the toothless gear, cam, connecting rod I, connecting rod II, connecting rod III and connecting rod IV.

[0005] If the clamping and fixing method between the carrier and the fin is unreliable, the fin may fall off from the fixing device or shift relatively due to the effects of gravity and inertia during the flipping process, which will not only affect the flipping effect, but also cause damage or loss of the fin. For example, in patent publication number CN108674940B, the carrier is a U-shaped plate with one side open. The rotation speed and angle of the carrier need to be precisely controlled, otherwise there is a possibility that the material (fin) will fly out of the carrier, which may easily cause damage to the fin. The requirements for the connecting parts of the carrier are high; in order to ensure the fins are in place, the carrier body is a U-shaped plate with one side open. The space area of the carrier is slightly larger than the floor space of the fins. The fins may slide or shake and collide during the flipping process, which may also cause damage to the fins. In order to complete the transportation of the fins at the same time during the flipping process, one end of the fin directly contacts the surface of the conveying device and collides with it. For example, patent publication number CN108674940B shows that after the carrier is flipped, the carrier and the conveying body have an inclined angle. The fins cannot directly contact the conveying body, but need to fall from the carrier to the conveying body, which makes the fins prone to collision. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the present invention provides a flipping device for rolling solder paste on the front and back sides of heat exchanger fins. The fins are clamped by a clamping part and flipped 180°. During the flipping process, the instantaneous impact force of the fins is reduced by a buffer part, and the inclined surface of the second clamping arm and the bow-shaped ring plate is used to guide the fins to slide into the conveyor table.

[0007] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solution: A flipping device for rolling solder paste on the front and back sides of heat exchanger fins, comprising: a box body and a soldering box, a conveyor platform is provided between the box body and the soldering box, and includes:

[0008] The clamping part is used to clamp the conveyed fins, and the clamping part is installed at one end of the box body close to the welding box. The clamping part includes: a first clamping arm and a second clamping arm, and the first clamping arm and the second clamping arm are staggered;

[0009] A rotating portion, used to control the flipping of the clamping portion via a rotating shaft, wherein the rotating portion is connected to the clamping portion;

[0010] A buffer portion, used to reduce the impact force on the fin when it turns over, and the buffer portion is arranged between the rotating portion and the conveying platform;

[0011] The stretching part tilts the second clamping arm after flipping through inertia and elasticity and cooperates with the buffer part to guide the fin to slide along the inclined surface into the conveying platform. One end of the stretching part is connected to the second clamping arm.

[0012] Preferably, there are two clamping parts, and the two clamping parts are symmetrically distributed on both sides of the rotating shaft. The clamping part also includes: a first fixing ring, the first fixing ring is fixedly connected to the first clamping arm, a second fixing ring is provided on the side of the first fixing ring away from the first clamping arm, and a limiting ring is provided on the side of the second fixing ring away from the first clamping arm. The first fixing ring, the second fixing ring and the limiting ring are all fixedly connected to the rotating shaft, the side of the second fixing ring is connected to an outward expansion plate, the side of the outward expansion plate away from the first fixing ring is connected to the second clamping arm, the first clamping arm is arranged below the second clamping arm, and the side of the second fixing ring away from the first clamping arm is connected to a stopper.

[0013] Preferably, the stretching portion includes: a fan ring plate, the fan ring plate is adapted to the shape of the connection between the second fixing ring and the outer expansion plate, the fan ring plate is connected to a rotating ring on the side close to the rotating shaft, the rotating ring is arranged between the second fixing ring and the limiting ring, the rotating ring is rotatably connected to the rotating shaft, the fan ring plate is connected to a first arc plate and a second arc plate on the side close to the first clamping arm, the first arc plate is adapted to the outer expansion plate and is arranged on the outside of the outer expansion plate, the second arc plate is adapted to the second fixing ring and is arranged on the outside of the second fixing ring, the first arc plate is connected to the second arc plate through a vertical plate The lock member is connected to the first locking cam and the lock member is connected to the first locking cam, and the lock member is connected to the at least one locking cam of the second locking cam.

[0014] Preferably, the length of the slide groove is greater than the length of the slider, the axis of the slide groove is collinear with the axis of the rotating shaft, and the first clamping arm and the second clamping arm are staggered in both the horizontal direction and the vertical direction.

[0015] Preferably, the buffer part includes: an arched arc plate, the arched arc plate is located between the rotating shaft and the conveying platform, a shift rod is connected to the center of the bottom of the arched arc plate, both ends of the bottom of the arched arc plate are connected to a U-shaped plate through a spring, the top of the U-shaped plate is connected to a cylinder, both ends of the U-shaped plate are connected to the side of the conveying platform, the bottom end of the shift rod extends into the cylinder and is slidably connected to the inner wall of the cylinder, the middle part of the side of the cylinder is connected to a limiting block through a support plate, the limiting block is adapted to the arched ring plate, and the limiting block is used to support the arched ring plate.

[0016] Preferably, the top of the limit block is located above the conveying platform, the limit block is an elastic plate, the distance between the axis of the rotating shaft and the conveying platform is less than the length of the fin, the distance from the top of the bow-shaped ring plate to the clamping part is two-thirds of the length of the fin, and the distance from the top of the bow-shaped ring plate to one end of the conveying platform is one-quarter of the length of the fin.

[0017] Preferably, when the clamping part is located in the box and does not rotate, the second clamping arm is in the starting state, the stop block supports the second clamping arm, and the top of the second clamping arm is in the same plane as the surface of the conveyor belt. When the clamping part flips 180°, the second clamping arm is in the rotated state. When the second clamping arm continues to rotate and the angle with the horizontal plane is 10-15°, the second clamping arm is in the terminal state, and the fin slides down along the second clamping arm and the top of the bow-shaped ring plate to the conveying platform, and the slider slides from one end of the slide groove to the other end of the slide groove.

[0018] Preferably, a conveyor belt is provided in the box body, and the conveyor belt is used to convey the fins to the clamping part. The clamping length of the clamping part is two-sevenths to three-sevenths of the length of the fin. The rotating part of the rotating shaft is connected to the bidirectional motor, and the conveying platform is used to convey the fins into the welding box.

[0019] Beneficial Effects: This invention provides a flipping device for roll-coating solder paste on the front and back surfaces of heat exchanger fins. Compared to existing technologies, this device offers the following advantages: 1. The clamping portion grips the fin and flips it 180°. The staggered arrangement of the first and second clamping arms (horizontally and vertically) increases the contact area between the clamping portion and the fin, enhancing torsional resistance and preventing the fin from falling. During the flipping process, the buffer portion reduces the instantaneous impact force on the fin, and the inclined surface of the second clamping arm and the top of the buffer portion guides the fin onto the transfer platform.

[0020] 2. The distance from the top of the arched ring plate to the clamping portion is two-thirds of the fin length. The top of the limit block is located above the conveyor platform, ensuring that one end of the fin cannot directly contact the conveyor platform during the flipping process. Instead, it needs to first contact the top of the arched ring plate. The buffering portion cushions the instantaneous impact force generated by the rapid flipping of the fin, reducing damage to the fin and the clamping portion. However, to ensure that the buffered fin can quickly and easily slide from the clamping portion to the conveyor platform, one end of the fin needs to slide down the inclined surface to the conveyor platform, and the friction of the conveyor platform is used to accelerate the fin's withdrawal from the clamping portion. Therefore, after flipping, one end of the fin cannot be too far away from the conveyor platform. Therefore, the distance from the top of the arched ring plate to one end of the conveyor platform can be set to one-quarter of the fin length.

[0021] 3. When the clamping portion is within the housing and not rotating, the second clamping arm is in a starting position, and the stopper supports the second clamping arm. The stopper prevents one end of the second clamping arm from rotating downward under the action of gravity. It also prevents the second clamping arm from passing over the stopper due to inertia and gravity when the second clamping arm rotates back to its original position after flipping, thereby limiting the clamping gap between the second clamping arm and the first clamping arm, preventing the clamping gap from being too large, and ensuring the stability of the clamping. The top of the second clamping arm is in the same plane as the conveyor belt surface. When the clamping portion flips 180°, the second clamping arm is in a post-rotation state. When the second clamping arm continues to rotate and forms an angle of 10-15° with the horizontal plane, the second clamping arm is in a terminal state. The fin slides down along the second clamping arm and the top of the arched ring plate to the conveyor platform, and the slider slides from one end of the chute to the other end of the chute.

[0022] 4. The arched ring plate is a parabola with an opening facing downward. The extrusion area between the top of the arched ring plate and the fin is small, and the arched ring plate is composed of two arc-shaped plate surfaces, which is convenient for fitting with the fin and guiding the fin to slide down.

[0023] 5. The height of the bow ring plate is changed by collision and different gravity effects, so that the bow ring plate and the inclined second clamping arm form a sliding slope, which is also convenient for alleviating the instantaneous impact force of the fin. It is also convenient for lowering the bow ring plate when the fin is not supported by the second clamping arm, reducing the height of the bow ring plate and the conveying platform, and the impact force when one end of the fin falls on the conveying platform is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and enable those skilled in the relevant art to make and use the present application.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural diagram of the part where the box is located.

[0028] Figure 3 This is a top sectional view of the box body.

[0029] Figure 4 It is a structural diagram of the conveyor belt, rotating shaft, second fixed ring and limiting ring.

[0030] Figure 5 It is a structural diagram of the limiting ring, the second clamping arm, the second arc plate, and the hook spring.

[0031] Figure 6 It is a structural diagram of the part where the first clamping arm and the second clamping arm are located.

[0032] Figure 7 for Figure 6 Exploded diagram.

[0033] Figure 8 for Figure 7 Exploded view of the portion where the second fixing ring and the second clamping arm are located.

[0034] Figure 9 It is a structural diagram of the part where the second clamping arm is located.

[0035] Figure 10 It is a structural diagram of the bow ring plate, limit block, spring, and U-shaped plate.

[0036] Figure 11 for Figure 10 Exploded view after removing the U-shaped plate.

[0037] Figure 12 This is a structural diagram of the second clamping arm and the arched ring plate after the fin is rotated 180°.

[0038] Figure 13 This is a structural schematic diagram of the fin sliding down along the second clamping arm and the arched ring plate after the second clamping arm rotates downward.

[0039] The accompanying drawings are marked as follows: 1. Box body; 2. Conveying platform; 3. Welding box; 41. First clamping arm; 42. First fixing ring; 43. Rotating rod; 44. Second fixing ring; 45. Limiting ring; 46. Second clamping arm; 47. Outward expansion plate; 48. Stopper; 51. Slide groove; 52. Slider; 53. Fan ring plate; 54. First arc plate; 55. Second arc plate; 56. Rotating ring; 57. First connecting plate; 58. Hook spring; 59. Second connecting plate; 61. Bow ring plate; 62. Shifting rod; 63. Cylinder body; 64. Spring; 65. Limiting block; 66. Support plate; 7. U-shaped plate; 8. Conveyor belt; 9. Rotating shaft.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] Example 1: Figure 1 - Figure 8As shown, an embodiment of the present invention provides a flipping device for rolling solder paste on the front and back sides of a heat exchanger fin, comprising: a clamping portion for clamping the conveyed fin, the clamping portion comprising: a first clamping arm 41, a second clamping arm 46, the first clamping arm 41 and the second clamping arm 46 are staggered, there are two clamping portions in total, the two clamping portions are symmetrically distributed on both sides of the rotating shaft 9, the clamping portion further comprises: a first fixing ring 42, the first fixing ring 42 is fixedly connected to the first clamping arm 41, a second fixing ring 44 is provided on the side of the first fixing ring 42 away from the first clamping arm 41, the second fixing ring 44 A limiting ring 45 is provided on the side away from the first clamping arm 41, and the first fixing ring 42, the second fixing ring 44 and the limiting ring 45 are all fixedly connected to the rotating shaft 9. The side of the second fixing ring 44 is connected with an outward expansion plate 47, and the outward expansion plate 47 is connected to the second clamping arm 46 on the side away from the first fixing ring 42. The first clamping arm 41 is arranged below the second clamping arm 46, and the side of the second fixing ring 44 away from the first clamping arm 41 is connected with a stop block 48. The first clamping arm 41 and the second clamping arm 46 are staggered in the horizontal and vertical directions, and the rotating part of the rotating shaft 9 is connected to the bidirectional motor.

[0044] The first clamping arm 41 and the second clamping arm 46 are respectively located on the side away from the first fixing ring 42 and the second fixing ring 44. By adding the first fixing ring 42 and the second fixing ring 44 between the first clamping arm 41 and the second clamping arm 46, the distance between the first clamping arm 41 and the second clamping arm 46 is increased, so that the distance between the first clamping arm 41 and the second clamping arm 46 is 0.2-0.5 of the fin width.

[0045] The staggered arrangement (both horizontally and vertically) of the first and second clamping arms 41, 46 increases the contact area between them. When pressure or friction needs to be transmitted, a larger contact area improves force transmission efficiency, reduces pressure per unit area, and reduces the likelihood of wear and fatigue damage. The staggered arrangement also makes the connection points between the first and second clamping arms 41, 46 more evenly distributed, allowing for more effective force transmission and distribution between the two plates. Compared with the parallel setting, the staggered setting can avoid stress concentration at certain specific points or areas, thereby improving the ability of the overall structure to resist external forces and making the structure more stable; the first clamping arm 41 and the second clamping arm 46 are staggered in the vertical direction to increase the torsional stiffness of the structure. When the structure is subjected to torsional force, the staggered first clamping arm 41 and the second clamping arm 46 can restrain each other and prevent each other from twisting, so that the entire structure has better anti-torsion stability; when the staggered first clamping arm 41 and the second clamping arm 46 are subjected to external force, the first clamping arm 41 and the second clamping arm 46 will pull and squeeze each other through the staggered parts. This interaction enables the structure to withstand greater deformation before destruction, show better toughness, and improve the structure's earthquake resistance, impact resistance and other properties.

[0046] The rotating part controls the clamping part to flip 180 degrees clockwise or counterclockwise through the rotating shaft 9.

[0047] A conveyor belt 8 is provided in the box body 1 and is used to convey the fins to the clamping portion. The clamping length of the clamping portion is two-sevenths to three-sevenths of the length of the fins.

[0048] When the clamping length of the clamping portion is two-sevenths of the fin length, the clamping length is short, the manufacturing cost of the clamping portion is low, and the fin is easy to separate from the clamping portion after being turned over.

[0049] When the clamping length of the clamping portion is three-sevenths of the fin length, the clamping length is long and the clamping stability is high. During the clamping and flipping process, the fin is not likely to fall off the clamping portion, thereby improving stability.

[0050] The top of the conveyor platform 2 and the top of the conveyor belt 8 are coplanar. During use, the fin is positioned along the conveyor belt 8 and close to the clamping portion. The first clamping arm 41 and the second clamping arm 46 are interlaced, leaving a clamping gap between the first clamping arm 41 and the second clamping arm 46. The fin enters the clamping gap and is clamped by the first clamping arm 41 and the second clamping arm 46. The bidirectional motor is activated, and the rotating portion of the bidirectional motor rotates 180° via the rotating shaft 9, causing the first fixing ring 42, the second fixing ring 44, the first clamping arm 41, and the second clamping arm 46 to rotate 180°. One end of the fin contacts the surface of the conveyor platform 2 and moves with the transmission device under the action of friction, completely withdrawing the fin from the clamping gap. The bidirectional motor rotates 180°, and the clamping portion returns to its initial position.

[0051] Example 2: Figure 1 - Figure 13 As shown, an embodiment of the present invention provides a flipping device for rolling solder paste on the front and back sides of a heat exchanger fin, comprising: a buffer portion for reducing the impact force received by the fin when flipping, the buffer portion being arranged between the rotating portion and the conveying platform 2, the buffer portion comprising: an arched arc plate, the arched arc plate being located between the rotating shaft 9 and the conveying platform 2, a shift rod 62 being connected at the center of the bottom of the arched arc plate, both ends of the bottom of the arched arc plate being connected to a U-shaped plate 7 through a spring 64, a cylinder 63 being connected to the top of the U-shaped plate 7, both ends of the U-shaped plate 7 being connected to the side of the conveying platform 2, the bottom end of the shift rod 62 extending into the cylinder 63 and slidingly connected to the inner wall of the cylinder 63, the middle part of the side of the cylinder 63 being connected to a limit block 65 through a support plate 66, the limit block 65 being adapted to the arched ring plate 61, the limit block 65 being used to support the arched ring plate 61, the top of the limit block 65 being located above the conveying platform 2, the limit block 65 being an elastic plate, and the distance between the axis of the rotating shaft 9 and the conveying platform 2 being less than the length of the fin.

[0052] When the top of the bow ring plate 61 is squeezed, the bow ring plate 61 moves downward with the shift rod 62, and the sliding connection between the shift rod 62 and the cylinder 63 also plays a guiding role, so that the bow ring plate 61 can only move vertically downward along the longitudinal axis of the cylinder 63, ensuring that the downward movement distance of each position of the top of the bow ring plate 61 is basically the same, avoiding the top of the bow ring plate 61 from tilting, and making the top of the bow ring plate 61 completely in contact with the fin.

[0053] During the flipping process of the fin, the fin hits the bow ring plate 61, the bow ring plate 61 moves down and is squeezed out with the limit block 65. The limit block 65 is an elastic rubber block. The limit block 65 supports the bow ring plate 61, and the bow ring plate 61 cannot move down any further, so that the bow ring plate 61 has a minimum height, which makes it convenient for the top of the bow ring plate 61 and the inclined second clamping arm 46 to form a sliding channel with the same inclination angle, so that the fin can slide down onto the conveying platform 2.

[0054] The distance from the top of the arched ring plate 61 to the clamping portion is two-thirds of the length of the fin, and the distance from the top of the arched ring plate 61 to one end of the conveying platform 2 is one-quarter of the length of the fin.

[0055] The distance from the top of the bow-shaped ring plate 61 to the clamping part is two-thirds of the length of the fin. The top of the limit block 65 is located above the conveying platform 2, ensuring that one end of the fin cannot directly contact the conveying platform 2 at the first time during the flipping process. Instead, it needs to contact the top of the buffer part (bow-shaped ring plate 61) first. The buffer part cushions the instantaneous impact force generated by the rapid flipping of the fin, thereby reducing damage to the fin and the clamping part.

[0056] However, in order to ensure that the buffered fin can slide quickly and easily from the clamping part to the conveying platform 2, one end of the fin needs to slide down to the conveying platform 2 with the help of the inclined surface, and use the friction of the conveying platform 2 to accelerate the withdrawal of the fin from the clamping part. Therefore, after flipping, one end of the fin cannot be too far away from the conveying platform 2. Therefore, the distance from the top of the arched ring plate 61 to one end of the conveying platform 2 can be set to one-quarter of the length of the fin.

[0057] The stretching part, through inertia and elastic action, makes the second clamping arm 46 tilt after flipping and cooperates with the buffer part to guide the fin to slide into the conveying platform 2 along the inclined surface. The stretching part includes: a fan ring plate 53, the fan ring plate 53 is adapted to the shape of the connection between the second fixing ring 44 and the outer expansion plate 47, the fan ring plate 53 is connected to the side of the rotating shaft 9 with a rotating ring 56, the rotating ring 56 is arranged between the second fixing ring 44 and the limit ring 45, the rotating ring 56 is rotatably connected to the rotating shaft 9, the fan ring plate 53 is connected to the side of the first clamping arm 41 with a first arc plate 54 and a second arc plate 55, the first arc plate 54 is adapted to the outer expansion plate 47 and is arranged on the outside of the outer expansion plate 47, the second arc plate 55 is adapted to the second fixing ring 44 and is arranged on the outside of the second fixing ring 44, the first arc plate 54 is connected to the second arc plate 55 through a vertical plate, and the fan ring plate 53 is close to the first A first connecting plate 57 is connected to the edge of one end of the clamping arm 41, and the first connecting plate 57 is connected to the second connecting plate 59 through a hook spring 58. The second connecting plate 59 is connected to the end of the second clamping arm 46 away from the first clamping arm 41. A slider 52 is connected to the middle of the fan ring plate 53 close to the first clamping arm 41. A sliding groove 51 is provided on the side of the second fixing ring 44 close to the fan ring plate 53. The slider 52 is slidably connected to the sliding groove 51. One end of the rotating rod 43 passes through the first fixing ring 42 and the second fixing ring 44 in sequence and is rotatably connected to the second clamping arm 46. The length of the sliding groove 51 is greater than the length of the slider 52. The axis of the sliding groove 51 is collinear with the axis of the rotating shaft 9. A rotating rod 43 is provided on the side of the fan ring plate 53 away from the first clamping arm 41. The conveying platform 2 is connected to the welding box 3. The conveying platform 2 is used to convey the fins into the welding box 3.

[0058] The length of the chute 51 is greater than that of the slider 52 to ensure that the slider 52 can slide in the chute 51, thereby allowing the second clamping arm 46 to tilt. However, the length of the chute 51 cannot be too long, otherwise the second clamping arm 46 will tilt at a large angle, the hook spring 58 will be stretched too long, which will not be conducive to the second clamping arm 46 rotating back to its original position and will also shorten the life of the hook spring 58.

[0059] When the clamping portion is located within the housing 1 and is not rotating, the second clamping arm 46 is in its initial position, supported by the stopper 48. The stopper 48 prevents one end of the second clamping arm 46 from rotating downwardly under the action of gravity. It also prevents the second clamping arm 46 from moving past the stopper 48 due to inertia and gravity when the second clamping arm 46 returns to its original position after flipping. This limits the clamping gap between the second clamping arm 46 and the first clamping arm 41, preventing the gap from being too large and ensuring the stability of the clamping. The top of the second clamping arm 46 is coplanar with the surface of the conveyor belt 8. After the clamping portion flips 180°, the second clamping arm 46 is in its post-rotation position. When the second clamping arm 46 continues to rotate and forms an angle of 10-15° with the horizontal plane, the second clamping arm 46 is in its final position. The fin slides down along the second clamping arm 46 and the top of the arched ring plate 61 to the conveyor platform 2, and the slider 52 slides from one end of the chute 51 to the other end of the chute 51.

[0060] The spring 64 has a small elastic coefficient but a strong restoring ability. The spring 64 can be made of brass.

[0061] The flipping speed is fast. After flipping 180°, the second clamping arm 46 cannot remain stationary due to the tension of the spring 64. Due to inertia and gravity, the second clamping arm 46 cannot stop immediately and continues to rotate downward. After the rotation, when the second clamping arm 46 is at an angle of 10° with the horizontal plane, the inclination angle is small, and the fin slowly falls along the inclined surface and moves downward smoothly. When the second clamping arm 46 is at an angle of 15° with the horizontal plane, the inclination angle is large, and the downward component of force along the inclined surface is large, which accelerates the fin's downward movement and improves flipping efficiency.

[0062] The top of the conveyor platform 2 is located below the top of the conveyor belt 8. During use, the fins enter the clamping gap between the first clamping arm 41 and the second clamping arm 46 along the conveyor belt 8. The rotating part of the bidirectional motor causes the first clamping arm 41, the second clamping arm 46, and the fins to flip. During the flipping process, the fins approach and strike the arched ring plate 61. Under the action of the impact force, the arched ring plate 61 moves downward along the longitudinal axis of the cylinder 63 with the shift rod 62. The spring 64 compresses, separating the fins from the arched ring plate 61. The fins continue to flip, and the arched ring plate 61 strikes the limit block 65. The limit block 65 is an elastic rubber block that can reduce the instantaneous impact force of the arched ring plate 61. The limit block 65 blocks the arched ring plate 61, preventing it from moving further downward. The arched ring plate 61 is forced to move upward rapidly under the restoring action of the spring 64 and contact the bottom of the fin. At this time, the fins are mainly clamped by the clamping part, and the force exerted by one end of the fin on the arched ring plate 61 is relatively small. When the fin flips to 180 degrees, the bidirectional motor stops rotating. However, the flipping speed is fast. After flipping 180 degrees, the second clamping arm 46 cannot remain still under the tension of the spring 64. The second clamping arm 46 needs to continue to rotate downward under the action of inertia and gravity. The second clamping arm 46 has a tendency to continue to rotate downward. The second clamping arm 46 thereby rotates the hook spring 58, the sector ring, the swivel 56, the slider 52, the first arc plate 54, and the second arc plate 55 in the circumferential direction. The slider 52 moves from one end of the slide 51 to the other end of the slide 51. The length of the slider 52 is 0.9-0.95 of the length of the slide 51. The second clamping arm 46 is tilted, and the fin in the clamping gap is loosened. The fin moves down near one end of the conveying platform 2. At this time, the bottom of the fin presses down the bow ring plate 61, and the spring 64 is compressed. Under the action of elasticity, the top of the bow ring plate 61 and the upper surface of the second clamping arm 46 are located in the same inclined plane, and the fin slides down along the inclined plane. One end of the fin quickly contacts the conveying platform 2, and the fin is completely pulled out of the clamping gap due to the inclined sliding and friction force. At this time, the length of the fin away from the bow ring plate 61 and the box body 1 is less than half of the total length of the fin, and the fin will not fall off the bow ring plate 61. After the fin is pulled out of the clamping gap, the bidirectional motor reverses and returns the clamping part to its initial position. The weight of the fin is primarily concentrated on the arched ring plate 61, increasing the pressure on the arched ring plate 61. The spring 64 continues to compress until the bottom of the arched ring plate 61 contacts the elastic block. At this point, the height difference between the top of the arched ring plate 61 and the conveyor platform 2 is small. When one end of the fin falls on the conveyor platform 2, the impact force between the two is small, reducing damage to the fin. The arched ring plate 61 is a downward-opening parabola. The extrusion area between the top of the arched ring plate 61 and the fin is small. The arched ring plate 61 is composed of two curved plate surfaces, which facilitates contact with the fin and guides the fin to slide down.

[0063] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. While specific details are described in detail in the preferred embodiments of the present invention to provide a thorough understanding of the present invention, those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A flipping device for rolling solder paste on the front and back sides of heat exchanger fins, comprising: A box body (1) and a welding box (3), wherein a conveying platform (2) is provided between the box body (1) and the welding box (3), and is characterized in that it comprises: A clamping portion is used to clamp the transported fins, the clamping portion is mounted on one end of the box body (1) close to the welding box (3), and the clamping portion comprises: a first clamping arm (41) and a second clamping arm (46), wherein the first clamping arm (41) and the second clamping arm (46) are arranged in a staggered manner; A rotating portion, used for controlling the clamping portion to flip 180° via a rotating shaft (9), the rotating portion being connected to the clamping portion; A buffer portion, used to reduce the impact force on the fin when it turns over, the buffer portion being arranged between the rotating portion and the conveying platform (2); The stretching portion causes the second clamping arm (46) to tilt after flipping through inertia and elasticity, and cooperates with the buffer portion to guide the fin to slide along the inclined surface into the conveying platform (2), and one end of the stretching portion is connected to the second clamping arm (46); There are two clamping parts in total, and the two clamping parts are symmetrically distributed on both sides of the rotating shaft (9). The clamping part also includes: a first fixing ring (42), the first fixing ring (42) is fixedly connected to the first clamping arm (41), a second fixing ring (44) is provided on the side of the first fixing ring (42) away from the first clamping arm (41), and a limiting ring (45) is provided on the side of the second fixing ring (44) away from the first clamping arm (41). The first fixing ring (42), the second fixing ring (44), and the limiting ring (45) are all fixedly connected to the rotating shaft (9), the side of the second fixing ring (44) is connected to an outer expansion plate (47), and the side of the outer expansion plate (47) away from the first fixing ring (42) is connected to the second clamping arm (46), the first clamping arm (41) is arranged below the second clamping arm (46), and the side of the second fixing ring (44) away from the first clamping arm (41) is connected to a stopper (48); The stretching portion comprises: a fan ring plate (53), the fan ring plate (53) is adapted to the shape of the connection between the second fixing ring (44) and the outer expansion plate (47), the fan ring plate (53) is connected to a rotating ring (56) on one side close to the rotating shaft (9), the rotating ring (56) is arranged between the second fixing ring (44) and the limiting ring (45), the rotating ring (56) is rotatably connected to the rotating shaft (9), the fan ring plate (53) is connected to a first arc plate (54) and a second arc plate (55) on one side close to the first clamping arm (41), the first arc plate (54) is adapted to the outer expansion plate (47) and is arranged on the outside of the outer expansion plate (47), the second arc plate (55) is adapted to the second fixing ring (44) and is arranged on the outside of the second fixing ring (44), the first arc plate (54) is connected to the second arc plate (55) through a vertical plate, the fan ring plate (53) is close to the first clamping arm ( A first connecting plate (57) is connected to the edge of one end of the fan ring plate (41), the first connecting plate (57) is connected to the second connecting plate (59) through a hook spring (58), the second connecting plate (59) is connected to the end of the second clamping arm (46) away from the first clamping arm (41), the middle of the fan ring plate (53) close to the first clamping arm (41) is connected to a slider (52), the second fixing ring (44) is provided with a sliding groove (51) on the side close to the fan ring plate (53), the slider (52) is slidably connected to the sliding groove (51), the fan ring plate (53) is provided with a rotating rod (43) on the side away from the first clamping arm (41), one end of the rotating rod (43) passes through the first fixing ring (42) and the second fixing ring (44) in sequence and is rotatably connected to the second clamping arm (46), and the slider (52) slides from one end of the sliding groove (51) to the other end of the sliding groove (51).

2. The flipping device for rolling solder paste on the front and back surfaces of heat exchanger fins according to claim 1 is characterized in that: The length of the slide groove (51) is greater than the length of the slider (52), the axis of the slide groove (51) is collinear with the axis of the rotating shaft (9), and the first clamping arm (41) and the second clamping arm (46) are staggered in both the horizontal direction and the vertical direction.

3. The flipping device for rolling solder paste on the front and back sides of heat exchanger fins according to claim 1 is characterized in that: The buffer portion comprises: an arc plate, the arc plate is located between the rotating shaft (9) and the conveying platform (2), a shift rod (62) is connected to the center of the bottom of the arc plate, both ends of the bottom of the arc plate are connected to the U-shaped plate (7) through a spring (64), the top of the U-shaped plate (7) is connected to a cylinder (63), both ends of the U-shaped plate (7) are connected to the side of the conveying platform (2), the bottom end of the shift rod (62) extends into the cylinder (63) and is slidably connected to the inner wall of the cylinder (63), the middle part of the side of the cylinder (63) is connected to a limit block (65) through a support plate (66), the limit block (65) is adapted to the arc ring plate (61), and the limit block (65) is used to support the arc ring plate (61).

4. The flipping device for rolling solder paste on the front and back surfaces of heat exchanger fins according to claim 3 is characterized in that: The top of the limit block (65) is located above the conveying platform (2). The limit block (65) is an elastic plate. The distance between the axis of the rotating shaft (9) and the conveying platform (2) is less than the length of the fin. The distance from the top of the arched ring plate (61) to the clamping portion is two-thirds of the length of the fin. The distance from the top of the arched ring plate (61) to one end of the conveying platform (2) is one-quarter of the length of the fin.

5. The flipping device for rolling solder paste on the front and back surfaces of heat exchanger fins according to claim 1 is characterized in that: When the clamping portion is located in the box body (1) and does not rotate, the second clamping arm (46) is located in the starting state, the stop block (48) supports the second clamping arm (46), and the top of the second clamping arm (46) is located in the same plane as the surface of the conveyor belt (8). When the clamping portion is turned 180°, the second clamping arm (46) is located in the post-rotation state. When the second clamping arm (46) continues to rotate and the angle with the horizontal plane is 10-15°, the second clamping arm (46) is located in the terminal state, and the fin slides down along the second clamping arm (46) and the top of the bow-shaped ring plate (61) to the conveying platform (2).

6. The flipping device for rolling solder paste on the front and back surfaces of heat exchanger fins according to claim 5, characterized in that: A conveyor belt (8) is provided in the box body (1), and the conveyor belt (8) is used to convey the fin to the clamping portion. The clamping length of the clamping portion is two-sevenths to three-sevenths of the length of the fin. The rotating part of the rotating shaft (9) is connected to a bidirectional motor. The conveying platform (2) is used to convey the fin into the welding box (3).

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