A conveying structure in a lead frame processing process

Abstract

The present application relates to the technical field of lead frame conveying, and particularly relates to a conveying structure in a lead frame processing process. The conveying structure comprises a mounting frame, one side of the mounting frame is rotationally connected with a transmission shaft, the transmission shaft is fixedly connected with two driving wheels which are symmetrically distributed, the other side of the mounting frame is rotationally connected with two driven wheels which are symmetrically distributed, the driving wheels and the driven wheels on the same side are jointly provided with a synchronous belt, and the mounting frame is provided with a regulating mechanism. The regulating mechanism comprises a positioning wheel, a supporting wheel, an adjusting wheel and a sliding block. The synchronous belt is divided into two parts by the two adjusting wheels, the position of the synchronous belt part is kept in a stationary state without affecting the conveying of the lead frame on the synchronous belt, the lead frame is placed on the synchronous belt by a taking and placing mechanism, interference between the movement of the synchronous belt and the taking and placing mechanism is avoided, collision between the lead frame and the synchronous belt is avoided, and the probability of deformation, poor contact and even fracture of the lead pin of the lead frame is reduced.

Description

Technical Field

[0001] This invention relates to the field of lead frame conveying technology, and more particularly to a conveying structure in the lead frame processing process. Background Technology

[0002] The leadframe, as the chip carrier of integrated circuits, is a key structural component. It uses bonding materials to achieve electrical connections between the internal circuit leads and external leads, forming an electrical circuit and acting as a bridge connecting the chip and external wires. During the production and processing of leadframes, they need to be transferred between multiple processes. However, since each process is usually completed by independent equipment units, leadframes are often stacked when transferred between adjacent processes. When these stacked leadframes are transferred to a new process, they need to be placed sequentially onto the synchronous belt of that process using a pick-and-place mechanism. However, because the synchronous belt is constantly running, the pick-and-place mechanism cannot directly and smoothly place the leadframes on its surface. Therefore, the conventional operation is to release the pick-and-place mechanism when the leadframe moves to a certain height above the synchronous belt, allowing the leadframe to fall onto the synchronous belt on its own. While this method avoids direct interference between the pick-and-place mechanism and the synchronous belt, it inevitably leads to collisions between the leadframe and the synchronous belt. This is especially true for leadframes with cantilevered leads, which are prone to bending, deformation, poor contact, or even breakage after being subjected to severe vibration. Summary of the Invention

[0003] This invention provides a conveying structure for lead frame processing to overcome the shortcomings of existing lead frames, which suffer from collisions that cause pin bending, deformation, poor contact, or even breakage when transferred from a stacked state to a synchronous belt.

[0004] The technical solution of the present invention is as follows: a conveying structure in the lead frame processing process, comprising: a mounting frame, a drive shaft rotatably connected to one side of the mounting frame, two symmetrically distributed drive wheels fixedly connected to the drive shaft, two symmetrically distributed driven wheels rotatably connected to the other side of the mounting frame, a synchronous belt wound around the drive wheels and driven wheels on the same side, and an adjustment mechanism provided on the mounting frame; the adjustment mechanism comprises: a positioning wheel, a support wheel, an adjusting wheel, and a sliding block, the number of the positioning wheel, the support wheel, and the adjusting wheel are all four, and each is divided into two symmetrically distributed groups, the sliding block is two symmetrically distributed, the positioning wheel and the support wheel are rotatably connected to the mounting frame, the sliding block is slidably connected to the mounting frame, the two groups of adjusting wheels are respectively rotatably connected to adjacent sliding blocks, the positioning wheel, the support wheel, and the adjusting wheel on the same side are used to guide the synchronous belt, and a power component is provided on the mounting frame for providing power to the drive shaft and the two sliding blocks.

[0005] Furthermore, the power assembly includes: a power motor, an adjusting motor, a mounting housing, a lead screw, and a transmission block. The adjusting motor, the mounting housing, the lead screw, and the transmission block are symmetrically distributed in pairs. The power motor is fixed to the mounting frame via a bracket. The output shaft of the power motor is connected to the transmission shaft via a pulley and belt. The adjusting motor is fixed to the mounting frame via a bracket. The mounting housing is fixed to the mounting frame. The lead screw is rotatably connected to an adjacent mounting housing. The output shaft of the adjusting motor is fixed to an adjacent lead screw. The transmission block is slidably connected to an adjacent mounting housing and threadedly connected to an adjacent lead screw. A sliding groove is provided within the sliding block. The transmission block slides within the adjacent sliding groove, and the transmission block drives the adjacent sliding block to move through the adjacent sliding groove.

[0006] Furthermore, the horizontal height of the positioning wheel on the side closer to the driven wheel is greater than the horizontal height of the positioning wheel on the side closer to the drive shaft.

[0007] Furthermore, it also includes: a locking assembly disposed on the mounting frame, the locking assembly being used to restrict the movement of the timing belt, the locking assembly comprising: a slow-moving frame, a mounting cylinder, two bellows, and a friction block, the two positioning wheels coaxially located near the driven wheel being connected by a connecting rod, the slow-moving frame being fixedly connected to the adjacent transmission block, the mounting cylinder being slidably connected to the mounting frame, the slow-moving frame being slidably connected to the mounting cylinder, the two bellows being respectively fixedly connected between the upper and lower sides of the slow-moving frame and the mounting cylinder, the slow-moving frame, the mounting cylinder, and the two bellows together forming a damping cavity, and the damping cavity being filled with damping fluid, the friction block being fixedly connected to the upper side of the mounting cylinder, the friction block being used to contact and limit the positioning wheel on the side near the driven wheel, and the slow-moving frame being provided with a slow-moving hole for the flow of damping fluid.

[0008] Furthermore, in the vertical direction, the minimum distance between the friction block and the adjacent positioning wheel is less than the maximum stroke that the transmission block can move within the sliding groove.

[0009] Furthermore, it also includes: a magnetic sheet fixed to the lower side of the mounting cylinder; a magnetic suction sheet fixed to the mounting bracket below the magnetic sheet; a one-way valve installed in the damping cavity on the slow-moving bracket; a frustum block slidably connected to the slow-moving bracket; the frustum block is used to block the slow-moving hole; and a spring is fixed between the frustum block and the slow-moving bracket.

[0010] Furthermore, the side of the driven pulley that contacts the timing belt is frustum-shaped, and the timing belt has an inclined portion on the side near the driven pulley.

[0011] Furthermore, it also includes: two symmetrically distributed guide modules, both fixed to the mounting frame, with the two guide modules located above adjacent inclined portions, the guide modules being used to guide and change the position of the lead frame on the adjacent inclined portions.

[0012] Furthermore, it also includes: two symmetrically distributed air guide frames, two symmetrically distributed air vents, and an air pump. The air guide frames and the air pump are both fixedly connected to the mounting bracket. The air guide frames are connected to the air inlet of the air pump. The two air vents are respectively fixedly connected to the upper side of the adjacent air guide frames and in contact with the adjacent synchronous belt.

[0013] Furthermore, the air guide frame is fixed with a plurality of equally spaced diverter plates and a plurality of equally spaced elastic plates, and all the diverter plates and all the elastic plates in the same air guide frame are staggered.

[0014] In summary, this application includes at least one of the following beneficial technical effects: The present invention uses two adjusting wheels to divide the synchronous belt into two parts, so that the synchronous belt part remains stationary without affecting the conveying of the lead frame on the synchronous belt. This facilitates the pick-and-place mechanism to place the lead frame on the synchronous belt, avoids interference between the movement of the synchronous belt and the pick-and-place mechanism, and avoids collision between the lead frame and the synchronous belt, thereby reducing the probability of lead frame pin deformation, poor contact, or even breakage.

[0015] By utilizing the magnetic attraction between the magnetic sheet and the magnetic suction sheet, the mounting cylinder always tends to move downwards. This changes the way the friction block maintains the squeezing force between itself and the positioning wheel. In this way, the speed of the initial position of the synchronous belt carrying the lead frame can be controlled by the speed change of the sliding block. This gradually increases the speed of the synchronous belt, allowing the lead frame to accelerate together with the synchronous belt, reducing the probability of relative slippage between the lead frame and the synchronous belt, maintaining the relative position of the lead frame and the synchronous belt, and reducing the probability of wear on the lead frame.

[0016] The inclined section provides support for the lead frame, ensuring line contact between the lead frame and the inclined section. This accommodates situations where insufficient precision in the pick-and-place mechanism leads to excessive downward pressure on the lead frame, reducing the probability of damage to the lead frame during placement. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the driving wheel and the driven wheel of the present invention;

[0019] Figure 3 Appendix to this invention Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a three-dimensional structural diagram of the transmission block and mounting cylinder of the present invention;

[0021] Figure 5 This is a three-dimensional structural cross-sectional view of the mounting cylinder and friction block of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the one-way valve and the frustum block of the present invention;

[0023] Figure 7 This is a three-dimensional structural diagram of the synchronization belt and guidance module of the present invention;

[0024] Figure 8 This is a three-dimensional structural diagram of the passive pulley and timing belt of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the breathable plate and the flow divider of the present invention;

[0026] Figure 10 This is a three-dimensional structural diagram of the flow divider and elastic sheet of the present invention.

[0027] The components in the attached diagram are labeled as follows: 1-Mounting bracket, 2-Drive shaft, 3-Driving wheel, 4-Driven wheel, 5-Positioning wheel, 6-Support wheel, 7-Adjusting wheel, 8-Sliding block, 9-Synchronous belt, 901-Inclined part, 10-Power motor, 11-Adjusting motor, 12-Mounting shell, 13-Lead screw, 14-Transmission block, 141-Sliding groove, 15-Slowing frame, 151-Slowing hole, 16-Mounting cylinder, 161-Magnetic sheet, 162-Magnetic suction sheet, 17-Bellwall, 18-Friction block, 19-One-way valve, 20-Frustum block, 21-Spring, 22-Guide module, 23-Air guide frame, 24-Ventilating plate, 25-Air pump, 26-Diverter plate, 27-Elastic sheet. Detailed Implementation

[0028] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and drawings.

[0029] Example 1

[0030] This embodiment provides a conveying structure for the lead frame processing, which solves the problem of impact during the conveying of existing lead frames via double-row synchronous belts.

[0031] See Figure 1 and Figure 2A conveying structure for lead frame processing includes: a mounting frame 1, which consists of two legs and two symmetrically distributed mounting plates. The left side of the two mounting plates on the mounting frame 1 is rotatably connected to a drive shaft 2. The drive shaft 2 is fixedly connected to two symmetrically distributed drive wheels 3. The right side of the two mounting plates on the mounting frame 1 is rotatably connected to a driven wheel 4. The drive wheel 3 and the driven wheel 4 on the same side are wound with a synchronous belt 9. The mounting frame 1 is provided with a control mechanism for controlling the speed of the two synchronous belts 9.

[0032] See Figures 2 to 4 The control mechanism includes: positioning wheels 5, support wheels 6, adjusting wheels 7, and sliding blocks 8. There are four positioning wheels 5, four support wheels 6, and four adjusting wheels 7, which are divided into two symmetrically distributed groups. There are two symmetrically distributed sliding blocks 8. The two groups of positioning wheels 5 and the two groups of support wheels 6 are rotatably connected to the two mounting plates on the mounting frame 1, respectively. The two sliding blocks 8 are slidably connected to the two mounting plates on the mounting frame 1, respectively. The two groups of adjusting wheels 7 are rotatably connected to the adjacent sliding blocks 8, respectively. The synchronous belt 9 passes over the adjacent driving wheel 3 and the driven wheel 4, and also passes over the two adjacent positioning wheels 5, the two adjacent support wheels 6, and the two adjacent adjusting wheels 7. The positioning wheels 5, the support wheels 6, and the adjusting wheels 7 on the same side are used to guide the synchronous belt 9. The mounting frame 1 is equipped with a power assembly for providing power to the drive shaft 2 and the two sliding blocks 8.

[0033] The above settings enable the following: the timing belt 9 is divided into two parts by two adjusting wheels 7. Without affecting the conveying of the lead frame on the timing belt 9, the part of the timing belt 9 remains stationary, which facilitates the placement mechanism to place the lead frame on the timing belt 9. This avoids interference between the movement of the timing belt 9 and the placement mechanism, and also avoids collisions between the lead frame and the timing belt 9, reducing the probability of lead frame pin deformation, poor contact, or even breakage.

[0034] See Figure 1 , Figure 2 and Figure 4The power assembly includes: a power motor 10, an adjusting motor 11, a mounting housing 12, a lead screw 13, and a transmission block 14. The adjusting motor 11, the mounting housing 12, the lead screw 13, and the transmission block 14 are all symmetrically distributed in pairs. The power motor 10 is fixed to the left side of the mounting frame 1 via a bracket. The output shaft of the power motor 10 is connected to the transmission shaft 2 via a pulley and a belt. The adjusting motor 11 is fixed to an adjacent mounting plate on the mounting frame 1 via a bracket. The mounting housing 12 is fixed to an adjacent mounting plate on the mounting frame 1. The lead screw 13 is rotatably connected to the adjacent mounting housing 12. The output shaft of the adjusting motor 11 is fixed to the adjacent lead screw 13. The transmission block 14 is slidably connected to the adjacent mounting housing 12 and threadedly connected to the adjacent lead screw 13. A sliding groove 141 is provided in the sliding block 8. The transmission block 14 slides within the adjacent sliding groove 141 and drives the adjacent sliding block 8 to move through the adjacent sliding groove 141.

[0035] See Figure 2 The horizontal height of the right positioning wheel 5 is greater than that of the left positioning wheel 5, which makes it easier for the lead frame to pass through the gap between the two positioning wheels 5.

[0036] The lead frame conveying process after the above settings are adopted: When the device conveys the lead frame (in this article, the lead frame is conveyed from right to left), the power motor 10 is started, and the output shaft of the power motor 10 rotates counterclockwise through the pulley and belt drive shaft 2 (in this article, the output shaft 10 rotates counterclockwise). Figure 1 The main view is the rotational perspective of the part. The drive shaft 2 drives the drive wheel 3 to rotate. The drive wheel 3 drives the two adjacent positioning wheels 5, the adjacent driven wheels 4, the two adjacent support wheels 6 and the two adjacent adjusting wheels 7 to rotate together through the adjacent synchronous belt 9.

[0037] The operator sets the starting frequency and speed of the adjusting motor 11 according to the placement frequency of the pick-and-place mechanism, the speed of the synchronous belt 9, and the pitch of the thread on the lead screw 13. Before the pick-and-place mechanism places the lead frame on the right side of the synchronous belt 9, the two adjusting motors 11 start simultaneously (only one set of adjusting motors 11 and its corresponding parts are described below). The output shaft of the adjusting motor 11 drives the lead screw 13 to rotate. The lead screw 13 moves upward through the threaded transmission block 14. The transmission block 14 drives the adjusting wheel 7 to move upward through the sliding groove 141 and the sliding block 8, so that the upward speed of the adjusting wheel 7 is equal to half the speed of the synchronous belt 9. This allows the left half of the synchronous belt 9 to rotate normally, while the right half of the synchronous belt 9 remains stationary. At this time, the pick-and-place mechanism takes the opportunity to place the lead frame on the upper side of the right side of the synchronous belt 9 to avoid interference with the synchronous belt 9.

[0038] After the lead frame is placed on the right half of the synchronous belt 9, the adjusting motor 11 stops rotating. At this time, the right half of the synchronous belt 9 resumes movement and drives the lead frame on it to move to the left. The lead frame follows the synchronous belt 9 until it moves to the left and passes the positioning wheel 5. When the lead frame has completely moved to the left half of the synchronous belt 9, the adjusting motor 11 starts and rotates in the opposite direction. The output shaft of the adjusting motor 11 drives the two adjusting wheels 7 to move down through the lead screw 13, transmission block 14 and sliding block 8. Since the driving wheel 3 is in contact with the left half of the synchronous belt 9, the speed of the left half of the synchronous belt 9 remains unchanged, while the speed of the right half of the synchronous belt 9 increases until the adjusting wheels 7 are reset. Then the adjusting motor 11 stops. The above steps are repeated when the take-up and put-down mechanism places the lead frame again until the lead frame is no longer conveyed, and then the power motor 10 is stopped.

[0039] Example 2

[0040] This embodiment is a further optimization based on Embodiment 1.

[0041] See Figures 2 to 6 It also includes: a locking assembly set on the mounting plate on the rear side of the mounting frame 1, the locking assembly being used to restrict the movement of the synchronous belt 9; the locking assembly includes: a slow-moving frame 15, a mounting cylinder 16, two bellows 17, a friction block 18 and a one-way valve 19, the two coaxial positioning wheels 5 on the right side are connected by a connecting rod, the slow-moving frame 15 is fixedly connected to the adjacent transmission block 14, the mounting cylinder 16 is slidably connected to the mounting frame 1, the slow-moving frame 15 is slidably connected to the mounting cylinder 16, the two bellows 17 are respectively fixedly connected to the upper and lower sides of the slow-moving frame 15 and the mounting cylinder 16, the slow-moving frame 15, the mounting cylinder 16 and the two bellows 17 together form a damping cavity, and the damping cavity is filled with damping fluid, the friction block 18 is fixedly connected to the upper side of the mounting cylinder 16, the friction block 18 is used to contact and limit the positioning wheel 5 on the right rear side, and the slow-moving frame 15 is provided with a slow-moving hole 151 for the flow of damping fluid.

[0042] The above settings enable the right half of the timing belt 9 to remain stationary while the adjusting wheel 7 moves, and the right positioning wheel 5 is limited by the friction block 18 to prevent relative slippage between the timing belt 9 and the driving wheel 3, thus ensuring that the right half of the timing belt 9 remains stationary and improving the reliability of the device.

[0043] It should be noted that in this embodiment, the aperture of the slow-moving hole 151 is determined according to the speed of the synchronous belt 9, so that when the slow-moving frame 15 moves, it can drive the mounting cylinder 16 to move upward together through the damping fluid on its upper side; the mounting cylinder 16 will not move on its own under the influence of gravity, and in this embodiment, it is achieved by the friction between the mounting cylinder 16 and the mounting frame 1.

[0044] See Figure 3 and Figure 4In the vertical direction, the minimum distance between the friction block 18 and the adjacent positioning wheel 5 is less than the maximum stroke that the transmission block 14 can move in the sliding groove 141. The difference between the two is determined by the moving speed of the transmission block 14, the flow area of ​​the slow-moving hole 151, the viscosity of the damping fluid, and the friction between the mounting cylinder 16 and the mounting bracket 1. Ultimately, the friction block 18 contacts the adjacent positioning wheel 5 while the adjusting wheel 7 moves.

[0045] The process of conveying the lead frame after the above settings is as follows: When the regulating motor 11 is started and the transmission block 14 is moved upward through the lead screw 13, the transmission block 14 first slides upward in the sliding groove 141 (during this period, the sliding block 8 remains stationary). The transmission block 14 drives the slow-moving frame 15 to move upward. The slow-moving frame 15 squeezes the damping cavity, causing the damping fluid located on the upper side of the slow-moving frame 15 to flow downward through the slow-moving hole 151. At the same time, the slow-moving frame 15 drives the mounting cylinder 16, the bellows 17 and the friction block 18 to move upward together by squeezing the damping fluid on its upper side, so that the friction block 18 contacts the positioning wheel 5 and limits the positioning wheel 5. At this time, the mounting cylinder 16 and the friction block 18 remain stationary, and the transmission block 14 slides to the uppermost side of the sliding groove 141.

[0046] As the transmission block 14 continues to move upward, the damping fluid on the upper side of the slow-moving frame 15 gradually flows through the slow-moving hole 151 to the lower side of the slow-moving frame 15. The transmission block 14 drives the sliding block 8 to move upward through the sliding groove 141, repeating the step of the sliding block 8 moving upward in Embodiment 1 until the adjusting motor 11 stops. In this way, when the sliding block 8 moves upward, the positioning wheel 5 is limited, preventing the rotation of the right positioning wheel 5 and keeping the right half of the synchronous belt 9 stationary. When the adjusting motor 11 rotates in the opposite direction, the transmission block 14 first drives the mounting cylinder 16 and the friction block 18 to move downward through the resistance of the damping fluid to the movement of the slow-moving frame 15, so that the friction block 18 loses contact with the positioning wheel 5. Then the transmission block 14 drives the sliding block 8 to move downward, so that the adjusting wheel 7 is reset.

[0047] Example 3

[0048] Based on Example 2, this embodiment reduces the probability of relative slippage between the lead frame and the synchronization belt 9 during acceleration.

[0049] See Figures 3 to 6It also includes: a magnetic sheet 161, fixed to the lower side of the mounting cylinder 16; a magnetic suction sheet 162 located below the magnetic sheet 161, with magnetic attraction between the magnetic sheet 161 and the magnetic suction sheet 162; the magnetic suction sheet 162 provides support for the mounting cylinder 16 through the magnetic sheet 161; a one-way valve 19 located in the damping cavity is installed on the slow-moving frame 15, which is connected from bottom to top to enable the slow-moving frame 15 to move down quickly; a frustum block 20 is slidably connected to the slow-moving frame 15, which is used to block the slow-moving hole 151, and initially there is a gap between the frustum block 20 and the slow-moving hole 151; a spring 21 is fixed between the frustum block 20 and the slow-moving frame 15, which is used to maintain the relative position of the frustum block 20 and the slow-moving frame 15 initially, and to maintain the pressure in the damping cavity on the upper side of the slow-moving frame 15 during the movement of the mounting cylinder 16.

[0050] The above settings enable the magnetic attraction between the magnetic sheet 161 and the magnetic suction sheet 162 to keep the mounting cylinder 16 moving downwards, thus changing the way the friction block 18 maintains the squeezing force between itself and the positioning wheel 5. In this way, the speed of the right half of the synchronous belt 9 can be controlled by the speed change of the sliding block 8, so that the speed of the right half of the synchronous belt 9 gradually increases, allowing the lead frame to accelerate together with the right half of the synchronous belt 9, reducing the probability of relative slippage between the lead frame and the synchronous belt 9, maintaining the relative position of the lead frame and the synchronous belt 9, and reducing the probability of wear on the lead frame. The spring 21 and the frustum block 20 form a "pressure valve" to maintain the pressure in the damping cavity and prevent the friction block 18 from exerting excessive squeezing force on the adjacent positioning wheel 5, which could damage both of them.

[0051] It should be noted that in this embodiment, the mounting cylinder 16 can move downward on its own under the action of magnetic attraction; the flow area of ​​the gap between the slow-moving hole 151 and the frustum block 20 is determined according to the speed of the synchronous belt 9, so that when the slow-moving frame 15 moves, it can drive the mounting cylinder 16 to move upward together through the damping fluid on its upper side.

[0052] The lead frame conveying process after the above settings is adopted: When the transmission block 14 slides upward in the sliding groove 141, the slow-moving frame 15 provides an upward thrust to the mounting cylinder 16 through the damping fluid on its upper side. At the same time, the mounting cylinder 16 is subjected to the magnetic attraction between the magnetic plate 161 and the magnetic suction plate 162. In this state, the resultant force acting on the mounting cylinder 16 is upward, causing the mounting cylinder 16 and the friction block 18 to move upward together, so that the friction block 18 limits the positioning wheel 5. At this point, the mounting cylinder 16 and the friction block 18 stop moving upward.

[0053] After the friction block 18 stops moving upward, as the deceleration frame 15 continues to move upward, the damping fluid on the upper side of the deceleration frame 15 cannot flow through the gap between the deceleration hole 151 and the frustum block 20 in time. This causes the pressure of the damping fluid on the upper side of the deceleration frame 15 to gradually increase, and the squeezing force of the friction block 18 on the positioning wheel 5 to gradually increase, while the pressure of the damping fluid on the lower side of the deceleration frame 15 gradually decreases. This continues until the pressure difference between the damping fluids on the upper and lower sides of the deceleration frame 15 reaches a specified value (this value is adjusted by the elasticity of the spring 21). At this point, the damping fluid on the upper side of the deceleration frame 15 pushes the frustum block 20 downward, and... The compression spring 21 increases the flow area of ​​the gap between the slow-moving hole 151 and the frustum block 20, thereby increasing the flow rate of the damping fluid through the gap between the slow-moving hole 151 and the frustum block 20. This reduces the pressure difference of the damping fluid on the upper and lower sides of the slow-moving frame 15. In this way, the spring 21 and the frustum block 20 form a "pressure valve" to control the pressure of the damping fluid on the upper side of the slow-moving frame 15, thereby controlling the magnitude of the thrust applied by the slow-moving frame 15 to the mounting cylinder 16 through the damping fluid. This keeps the upward resultant force of the mounting cylinder 16 stable, thus keeping the squeezing force of the friction block 18 on the positioning wheel 5 stable.

[0054] After the pick-and-place mechanism places the lead frame on the right side of the synchronous belt 9, the adjusting motor 11 no longer pauses but gradually slows down, causing the transmission block 14 to move upward at a gradually slower speed. At this time, the thrust applied to the mounting cylinder 16 by the damping fluid by the slow-moving frame 15 gradually decreases, and the direction of the resultant force on the mounting cylinder 16 changes from upward to downward, causing the mounting cylinder 16 to move downward under the action of magnetic attraction and release the friction block 18 from the positioning wheel 5. This releases the limitation on the positioning wheel 5. At this time, the upward movement speed of the adjusting wheel 7 is less than half the speed of the synchronous belt 9, and as the speed of the adjusting motor 11 gradually decreases, the movement speed of the right side of the synchronous belt 9 gradually increases, causing the right side of the synchronous belt 9 to drive the lead frame to accelerate together, reducing the probability of relative slippage between the lead frame and the synchronous belt 9 due to the speed difference.

[0055] When the adjusting motor 11 stops, the speed of the right side of the synchronous belt 9 is the same as the speed of its left side. At this time, the steps in Embodiment 1 are repeated until the lead frame moves to the left side of the synchronous belt 9. Then the adjusting motor 11 is restarted. At this time, the adjusting motor 11 drives the slow-moving frame 15 to move down through the lead screw 13 and the transmission block 14, squeezing the damping fluid at the bottom of the slow-moving frame 15. The damping fluid flows quickly to the upper side of the slow-moving frame 15 through the one-way valve 19. After the transmission block 14 contacts the lower side of the sliding groove 141, the transmission block 14 drives the adjusting wheel 7 and the sliding block 8 to move down and reset, waiting for the placement of the next lead frame.

[0056] Example 4

[0057] This embodiment, based on embodiment 3, provides a way to reduce the probability of wear caused by relative sliding between the lead frame and the timing belt 9.

[0058] To address the issue of poor movement accuracy of the pick-and-place mechanism, if the pick-and-place mechanism has poor accuracy, during the process of placing the lead frame onto the synchronous belt 9, there may be a situation where the lead frame contacts the synchronous belt 9, but the pick-and-place mechanism still pushes the lead frame downward. This situation will cause the lead frame to bend and slip relative to the synchronous belt 9, which may easily cause the cantilever pins on the lead frame to be squeezed and damaged by the synchronous belt 9.

[0059] See Figure 2 , Figure 7 and Figure 8 The side of the passive pulley 4 that contacts the synchronous belt 9 is frustum-shaped, which is used to guide the opposite sides of the two synchronous belts 9 to undergo elastic tensile deformation. The right side of the synchronous belt 9 is provided with an inclined part 901. The inclined part 901 has an angle with the horizontal plane, and the distance between the two inclined parts 901 gradually decreases from top to bottom.

[0060] The above settings enable the inclined part 901 to provide support for the lead frame, making the lead frame and the inclined part 901 in line contact. This adapts to situations where the pick-and-place mechanism is not precise enough and excessively squeezes the lead frame downwards, reducing the probability of damage to the lead frame during placement.

[0061] See Figure 7 It also includes: two symmetrically distributed guide modules 22, which are respectively fixed to two mounting plates of the mounting frame 1. The two guide modules 22 are respectively located above adjacent inclined portions 901. The guide modules 22 are used to guide and change the position of the lead frame on the adjacent inclined portions 901. The guide module 22 consists of a rubber ring with an O-shaped cross section, two rollers and a support frame. There is friction between the rubber ring of the guide module 22 and the lead frame. The height of the rubber ring on the guide module 22 is greater than the height of the rollers and the support frame on it. The support frame of the guide module 22 is attached to the upper side of the inclined portion 901 to limit the shape of the inclined portion 901.

[0062] The above settings enable the guide module 22 to limit the position of the tilted part 901, maintain the stability of the tilted part 901, and guide the lead frame to slide on the tilted part 901 to adjust the position of the lead frame so that the lead frame is centered between the two synchronous belts 9 and keeps it in a horizontal state, which facilitates the subsequent processing of the lead frame.

[0063] Example 5

[0064] This embodiment improves the stability of the synchronous belt 9 during the conveying of the lead frame, based on embodiment 4.

[0065] See Figure 1 , Figure 2 , Figure 9 and Figure 10It also includes: two symmetrically distributed air guide frames 23, two symmetrically distributed air vents 24, and an air pump 25. The air guide frames 23 and the air pump 25 are both fixedly connected to the mounting frame 1. The air guide frames 23 are connected to the air inlet of the air pump 25. The two air vents 24 are respectively fixedly connected to the upper side of the adjacent air guide frames 23 and in contact with the adjacent synchronous belt 9. The air vents 24 are metal plates with uniformly distributed micropores on the surface. The synchronous belt 9 is made of polyurethane material and has uniformly distributed micropores on its surface.

[0066] See Figure 9 and Figure 10 Multiple flow dividers 26 and multiple elastic plates 27 are fixedly attached to the air guide frame 23 at equal intervals. All flow dividers 26 and elastic plates 27 within the same air guide frame 23 are staggered. The horizontal height of the position where the elastic plate 27 is fixed to the air guide frame 23 is lower than the horizontal height of the other positions on the elastic plate 27, so that the elastic plate 27 can swing under the influence of airflow.

[0067] The above settings can achieve the following: using negative pressure to adsorb the lead frame onto the synchronous belt 9, increasing the friction between the lead frame and the synchronous belt 9, reducing the probability of the lead frame slipping due to vibration during the movement of the synchronous belt 9, and using the drag force of airflow on the elastic sheet 27 to determine the position of the lead frame on the synchronous belt 9, adjusting the position of the air guide frame 23 connected to the outside, thereby increasing the downward extrusion force of the lead frame.

[0068] The process after the above settings are adopted is as follows: After the power motor 10 starts, the air pump 25 starts and draws the gas in the air guide frame 23 outward. The outside gas flows into the air guide frame 23 through the vent plate 24 to form a circulation. If there is no lead frame on the upper side of the synchronous belt 9, the outside gas passes through the synchronous belt 9 and the vent plate 24 and flows through the gap between the air guide frame 23 and all the elastic sheets 27 inside. When there is a lead frame on the upper side of the synchronous belt 9, the lead frame blocks the synchronous belt 9, which reduces the area on the synchronous belt 9 that allows gas to flow into the air guide frame 23. At this time, the lead frame... There is no gas flow near the elastic sheet 27 corresponding to the blocked part, and the gas flow velocity near the elastic sheet 27 corresponding to the part not blocked by the lead frame increases. At this time, the elastic sheet 27 is deformed by the drag force of the air flow, blocking the air guide frame 23 and sealing off all the positions where the air guide frame 23 communicates with the outside. However, the elastic sheet 27 corresponding to the part blocked by the lead frame does not block the air guide frame 23. Therefore, the negative pressure in the air guide frame 23 will generate a pressure difference between the lead frame and the external atmospheric pressure, which will exert a downward force on the lead frame, thus increasing the friction between the lead frame and the synchronous belt 9.

[0069] As the synchronous belt 9 drives the lead frame to move, the elastic sheet 27 corresponding to the lead frame is constantly changing. The elastic sheet 27 that loses its corresponding position to the lead frame will block the air guide frame 23 under the drag force of the airflow, and the new elastic sheet 27 corresponding to the lead frame will recover under its own elastic force.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A conveying structure in the lead frame processing, characterized in that, include: Mounting frame (1), one side of the mounting frame (1) is rotatably connected to a drive shaft (2), the drive shaft (2) is fixedly connected to two symmetrically distributed drive wheels (3), the other side of the mounting frame (1) is rotatably connected to two symmetrically distributed passive wheels (4), the drive wheels (3) and the passive wheels (4) on the same side are wound together with a synchronous belt (9), and the mounting frame (1) is provided with an adjustment mechanism. The regulatory agencies include: The system includes a positioning wheel (5), a support wheel (6), an adjusting wheel (7), and a sliding block (8). The number of the positioning wheel (5), the support wheel (6), and the adjusting wheel (7) are all four, and they are all divided into two symmetrically distributed groups. The sliding blocks (8) are two symmetrically distributed groups. The positioning wheel (5) and the support wheel (6) are rotatably connected to the mounting frame (1). The sliding blocks (8) are slidably connected to the mounting frame (1). The two groups of adjusting wheels (7) are rotatably connected to the adjacent sliding blocks (8). The positioning wheel (5), the support wheel (6), and the adjusting wheel (7) on the same side are used to guide the synchronous belt (9). The mounting frame (1) is provided with a power assembly for providing power to the drive shaft (2) and the two sliding blocks (8). The power assembly includes: The system comprises a power motor (10), an adjusting motor (11), a mounting housing (12), a lead screw (13), and a transmission block (14). The adjusting motor (11), mounting housing (12), lead screw (13), and transmission block (14) are symmetrically distributed in pairs. The power motor (10) is fixed to the mounting frame (1) via a bracket. The output shaft of the power motor (10) is connected to the transmission shaft (2) via a pulley and belt. The adjusting motor (11) is fixed to the mounting frame (1) via a bracket. The mounting housing (12) and the mounting frame (14) are connected... 1) Fixed connection, the lead screw (13) is rotatably connected to the adjacent mounting shell (12), the output shaft of the adjusting motor (11) is fixedly connected to the adjacent lead screw (13), the transmission block (14) is slidably connected to the adjacent mounting shell (12) and threadedly connected to the adjacent lead screw (13), the sliding block (8) is provided with a sliding groove (141), the transmission block (14) slides within the adjacent sliding groove (141), and the transmission block (14) drives the adjacent sliding block (8) to move through the adjacent sliding groove (141); Before the pick-and-place mechanism places the lead frame on the right side of the synchronous belt (9), the two adjusting motors (11) start simultaneously. The output shaft of the adjusting motor (11) drives the lead screw (13) to rotate. The lead screw (13) moves upward through the threaded transmission block (14). The transmission block (14) drives the adjusting wheel (7) to move upward through the sliding groove (141) and the sliding block (8), so that the speed of the adjusting wheel (7) moving upward is equal to half the speed of the synchronous belt (9). In this way, the left half of the synchronous belt (9) rotates normally, and the right half of the synchronous belt (9) is stationary. At this time, the pick-and-place mechanism takes the opportunity to place the lead frame on the upper side of the right side of the synchronous belt (9). After the lead frame is placed on the right half of the synchronous belt (9), the adjusting motor (11) stops rotating. At this time, the right half of the synchronous belt (9) resumes movement and drives the lead frame on it to move to the left. The lead frame follows the synchronous belt (9) until the lead frame moves to the left and passes the positioning wheel (5). When the lead frame moves completely to the left half of the synchronous belt (9), the adjusting motor (11) starts and rotates in the opposite direction. The output shaft of the adjusting motor (11) drives the two adjusting wheels (7) to move down through the lead screw (13), transmission block (14) and sliding block (8). Since the driving wheel (3) is in contact with the left half of the synchronous belt (9), the speed of the left half of the synchronous belt (9) remains unchanged, and the speed of the right half of the synchronous belt (9) increases until the adjusting wheel (7) is reset, and then the adjusting motor (11) stops.

2. The conveying structure in the lead frame processing according to claim 1, characterized in that, The horizontal height of the positioning wheel (5) on the side closer to the passive wheel (4) is greater than the horizontal height of the positioning wheel (5) on the side closer to the drive shaft (2).

3. The conveying structure in the lead frame processing according to claim 1, characterized in that, Also includes: A locking component disposed on the mounting bracket (1) is used to restrict the movement of the timing belt (9), the locking component comprising: The system comprises a slow-moving frame (15), a mounting cylinder (16), two bellows (17), and a friction block (18). Two positioning wheels (5) located near the passive wheel (4) and coaxially connected are linked by a connecting rod. The slow-moving frame (15) is fixedly connected to the adjacent transmission block (14). The mounting cylinder (16) is slidably connected to the mounting frame (1). The two bellows (17) are respectively fixed to the slow-moving frame (15). Between the upper and lower sides of the mounting cylinder (16), the damping frame (15), the mounting cylinder (16), and the two bellows (17) together form a damping cavity, and the damping cavity is filled with damping fluid. The friction block (18) is fixed to the upper side of the mounting cylinder (16). The friction block (18) is used to contact and limit the positioning wheel (5) on the side near the passive wheel (4). The damping frame (15) is provided with a damping hole (151) for the flow of damping fluid.

4. The conveying structure in the lead frame processing according to claim 3, characterized in that, In the vertical direction, the minimum distance between the friction block (18) and the adjacent positioning wheel (5) is less than the maximum stroke that the transmission block (14) can move in the sliding groove (141).

5. The conveying structure in the lead frame processing according to claim 3, characterized in that, Also includes: A magnetic sheet (161) is fixed to the lower side of the mounting cylinder (16). The mounting bracket (1) is fixed with a magnetic suction sheet (162) located below the magnetic sheet (161). The slow-moving bracket (15) is equipped with a one-way valve (19) located in the damping cavity. The slow-moving bracket (15) is slidably connected with a frustum block (20). The frustum block (20) is used to block the slow-moving hole (151). A spring (21) is fixed between the frustum block (20) and the slow-moving bracket (15).

6. The conveying structure in the lead frame processing according to claim 3, characterized in that, The side of the passive wheel (4) that contacts the synchronous belt (9) is frustum-shaped, and the synchronous belt (9) has an inclined part (901) on the side near the passive wheel (4).

7. The conveying structure in the lead frame processing according to claim 6, characterized in that, Also includes: Two symmetrically distributed guide modules (22) are fixed to the mounting frame (1). The two guide modules (22) are located above the adjacent inclined portions (901) respectively. The guide modules (22) are used to guide and change the position of the lead frame on the adjacent inclined portions (901).

8. The conveying structure in the lead frame processing according to claim 7, characterized in that, Also includes: Two symmetrically distributed air guide frames (23), two symmetrically distributed air vents (24), and an air pump (25) are provided. The air guide frames (23) and the air pump (25) are both fixedly connected to the mounting bracket (1). The air guide frames (23) are connected to the air inlet of the air pump (25). The two air vents (24) are respectively fixedly connected to the upper side of the adjacent air guide frames (23) and in contact with the adjacent synchronous belt (9).

9. The conveying structure in the lead frame processing according to claim 8, characterized in that, The air guide frame (23) is fixed with a plurality of equally spaced diverter plates (26) and a plurality of equally spaced elastic plates (27), and all the diverter plates (26) and all the elastic plates (27) in the same air guide frame (23) are staggered.

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