A lead frame clamping tool and transfer device

Abstract

A lead frame clamping tool and transfer device are disclosed, belonging to the field of lead frame clamping and transfer devices. The lead frame clamping tool includes: a horizontally arranged crossbeam and clamping assemblies on both sides thereof; the clamping assemblies include a sleeve, a suction tube, and a swing arm. The suction tube is coaxially inserted inside the sleeve, and its side wall has an air hole communicating with its inner hole. A piston plate is provided at the top of the suction tube, and a push rod is provided at the top of the piston plate. A first air passage is provided on the side wall of the sleeve, and a second air passage is provided at the top of the sleeve. The first and second air passages are connected to a negative pressure device through independent pipes. The middle section of the swing arm is rotatably connected to the side of the sleeve away from the crossbeam, and the axis of the rotatable connection is tangential to the sleeve. An extension plate is provided at the upper end of the swing arm, and its bottom surface is connected to the top surface of the push rod. A baffle is provided at the lower end of the swing arm. The suction tube is axially movable relative to the sleeve. This solution effectively prevents the lead frame from falling during transfer.

Description

Technical Field

[0001] This invention belongs to the field of lead frame clamping and transfer devices, and particularly relates to a lead frame clamping tool and transfer device. Background Technology

[0002] The production process of lead frames includes stamping, cleaning, electroplating and drying. The lead frames need to be adsorbed and transferred using suction cups between multiple processes. Although the existing equipment can ensure a continuous and stable negative pressure suction, the lead frames are still at risk of falling off during the transfer process due to the surface roughness of the lead frames, the adsorption area and mechanical vibration. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a lead frame clamping tool and transfer device that can effectively prevent the lead frame from falling off during the transfer process.

[0004] In order to achieve the objective of this invention, the following solution is proposed:

[0005] A lead frame clamping tool includes: a horizontally arranged crossbeam and clamping assemblies on both sides thereon, wherein multiple clamping assemblies are provided on both sides along the length direction of the crossbeam.

[0006] The clamping assembly includes a sleeve, a suction tube, and a swing arm. The suction tube is coaxially inserted inside the sleeve. The side wall of the suction tube has an air hole communicating with its inner hole. The lower end of the suction tube protrudes from the bottom of the sleeve for adsorbing the lead frame. The top of the suction tube is provided with a piston plate. A sliding sealing structure is provided between the outer circumference of the piston plate and the inner wall of the sleeve. The top of the piston plate is provided with a push rod that passes through the top plate of the sleeve. The side wall of the sleeve has a first air passage located below the piston plate. The top of the sleeve has a second air passage located above the piston plate. The first air passage and the second air passage are connected to the negative pressure device through independent pipes, and the negative pressure suction of the second air passage is greater than that of the first air passage.

[0007] The middle section of the swing arm is rotatably connected to the side of the sleeve away from the crossbeam. The axis of the rotatable connection is set along the tangent of the sleeve. The upper end of the swing arm is provided with an extension plate, the bottom surface of which is connected to the top surface of the push rod. The lower end of the swing arm is provided with a baffle.

[0008] The straw is axially movable relative to the sleeve. When the straw is moved to the lowest position, the baffle is higher than the lower end face of the straw. When the straw is moved to the highest position, the top surface of the baffle is parallel to the lower end face of the straw and is located below the lower end face of the straw at intervals.

[0009] The beneficial effects of this invention are as follows: After the lead frame is picked up by the straw, the lead frame is lifted by the straw, so that the lead frame is separated from the lead frames stacked below or the conveyor track below. At the same time as separation, the baffle is swung to the bottom of the lead frame to block the bottom of the lead frame and prevent the lead frame from falling after it is separated from the straw. Attached Figure Description

[0010] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of the invention.

[0011] Figure 1 A schematic diagram of the overall structure of the lead frame clamping tool of this application is shown.

[0012] Figure 2 A partial view of the bottom surface of the beam is shown.

[0013] Figure 3 This diagram illustrates the state of the lead frame clamping tool of this application when clamping the lead frame.

[0014] Figure 4 A schematic diagram of the end face of the lead frame clamping tool of this application is shown.

[0015] Figure 5 A cross-sectional view of the clamping component of this application is shown.

[0016] Figure 6 A cross-sectional view of the clamping assembly of this application is shown when the straw is in its lowest position.

[0017] Figure 7 A cross-sectional view of the clamping assembly of this application is shown when the lead frame is clamped.

[0018] The markings in the diagram are: crossbeam-1, clamping screw-11, sleeve-2, first air passage-201, second air passage-202, stepped surface-21, rack-22, gear-23, suction tube-3, air hole-301, piston plate-31, push rod-32, second spring-33, swing arm-4, extension plate-41, baffle-42, third spring-43, sealing washer-5, first spring-51. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1

[0021] like Figure 1 , Figure 3As shown, a lead frame clamping tool includes: a horizontally arranged crossbeam 1 and clamping assemblies on both sides of the crossbeam 1, with multiple clamping assemblies arranged along the length of the crossbeam 1. The distance between the clamping assemblies and the crossbeam 1 is adjustable to accommodate lead frames of different widths, and the suction position of the suction tube 3 on the lead frame can be adjusted.

[0022] Specifically, such as Figure 1 and Figures 3 to 7 As shown, the clamping assembly includes a sleeve 2, a suction tube 3, and a swing arm 4. Specifically, the clamping assembly is connected to the crossbeam 1 through the sleeve 2. The suction tube 3 is coaxially inserted inside the sleeve 2. The side wall of the suction tube 3 has an air hole 301 communicating with its inner hole. The lower end of the suction tube 3 protrudes from the bottom of the sleeve 2 for adsorbing the lead frame. The top of the suction tube 3 is provided with a piston plate 31. A sliding sealing structure is provided between the outer circumference of the piston plate 31 and the inner wall of the sleeve 2. Specifically, a sealing ring can be provided on the outer wall of the piston plate 31 to achieve a sliding seal. The top of the piston plate 31 is provided with a push rod 32 that passes through the top plate of the sleeve 2. The side wall of the sleeve 2 has a first air passage 201 located below the piston plate 31. The top of the sleeve 2 has a second air passage 202 located above the piston plate 31. The first air passage 201 and the second air passage 202 are connected to the negative pressure device through independent pipes, and the negative pressure suction of the second air passage 202 is greater than that of the first air passage 201.

[0023] Specifically, such as Figure 1 and Figures 3 to 7 As shown, the middle section of the swing arm 4 is rotatably connected to the side of the sleeve 2 away from the crossbeam 1. The axis of the rotatable connection is set along the tangent of the sleeve 2. An extension plate 41 is provided on the side of the upper end of the swing arm 4 facing the axis of the sleeve 2. Its bottom surface is connected to the top surface of the top rod 32. Specifically, a sliding connection or mutual contact can be adopted. A sliding connection means that the top end of the top rod 32 is slidably set along the length direction of the extension plate 41. A baffle 42 is provided on the side of the lower end of the swing arm 4 facing the axis of the sleeve 2.

[0024] The straw 3 is axially movable relative to the sleeve 2, such as Figure 6 As shown, when the straw 3 moves to its lowest position, the baffle 42 is higher than the lower end face of the straw 3, preventing it from affecting the contact between the lower end of the straw 3 and the top surface of the lead frame; Figure 7 As shown, when the straw 3 is moved to the highest position, the top surface of the baffle 42 is parallel to the lower end surface of the straw 3 and is located below the lower end surface of the straw 3 at intervals. The interval between the top surface of the baffle 42 and the lower end surface of the straw 3 is used to accommodate the lead frame.

[0025] The principle of using the above scheme to clamp the lead frame is as follows:

[0026] The first step is to move the crossbeam 1 downwards, causing all the clamping components to move closer to the lower lead frame until the lower end face of the straw 3 contacts the top surface of the lead frame.

[0027] The second step is to use a negative pressure device to evacuate the area below the piston plate 31 inside the sleeve 2 through the first air passage 201. The negative pressure airflow will generate suction on the lead frame through the air hole 301 and the inner hole of the suction tube 3, so as to achieve the purpose of adsorbing the lead frame.

[0028] In the third step, after the suction tube 3 adsorbs the lead frame, the first air channel 201 continues to be in a vacuum state to maintain the adsorption state of the lead frame. Then, the negative pressure device is used to evacuate the part above the piston plate 31 inside the sleeve 2 through the second air channel 202. When the negative pressure above the piston plate 31 is greater than the negative pressure below, the suction tube 3 will move upward relative to the sleeve 2. During this process, not only will the lead frame move upward, but under the push of the push rod 32, the extension plate 41 will swing upward, thereby driving the baffle 42 to swing downward along the axis of the sleeve 2 until the suction tube 3 moves to the highest position. At this time, the baffle 42 will move to the bottom of the lead frame.

[0029] Even if the lead frame is affected by the surface roughness, adsorption area and mechanical vibration during the transfer process, causing the lead frame to fall off the suction tube 3, the baffle 42 can be used to support and hold the lead frame to prevent it from falling off the clamping tool.

[0030] When releasing the lead frame, the airflow to either the first air passage 201 or the second air passage 202 can be disconnected first.

[0031] Preferred, such as Figures 5 to 7 As shown, the middle section of the inner wall of the sleeve 2 has a stepped surface 21 with an annular structure, which is used to limit the downward movement of the piston plate 31, thereby limiting the downward movement of the suction tube 3. The stepped surface 21 is located above the first air passage 201.

[0032] Preferred, such as Figures 5 to 7As shown, a sealing gasket 5 is fitted onto the outer wall of the straw 3, with its bottom surface supported on the stepped surface 21. The inner wall of the sealing gasket 5 and the outer wall of the straw 3 are connected in a sliding seal. A first spring 51 is provided between the top surface of the sealing gasket 5 and the bottom surface of the piston plate 31. Preferably, the first spring 51 is a cylindrical spring structure, fitted onto the outside of the straw 3. The first spring 51 is in a compressed state. This compression does not mean that the first spring 51 is fully compressed; that is, regardless of whether the straw 3 is moved to its highest or lowest position, the first spring 51 remains compressed to ensure that the sealing gasket 5 is always pressed tightly against the stepped surface 21, thereby ensuring a constant volume of space below the sealing gasket 5. To prevent the space below the piston plate 31 from increasing during its upward movement, thus affecting the stability of the suction force of the suction tube 3 on the lead frame, this solution involves injecting air into the space above the piston plate 31 through the second air passage 202 before using the suction tube 3 to adsorb the lead frame. This increases the air pressure above the piston plate 31, causing the suction tube 3 to move to its lowest position. After the suction tube 3 adsorbs the lead frame, the air above the piston plate 31 is sucked away through the second air passage 202, and the piston plate 31 will automatically rise under the elastic force of the first spring 51. In a further preferred embodiment, to ensure that the piston plate 31 rises smoothly and reliably, the space above the piston plate 31 still needs to be evacuated through the second air passage 202.

[0033] Further preferred, such as Figures 5 to 7 As shown, a second spring 33 is sleeved on the outside of the push rod 32, located between the top surface of the piston plate 31 and the top surface of the sleeve 2. The elastic force of the second spring 33 is greater than that of the first spring 51. This scheme uses the second spring 33 to drive the suction tube 3 to be in the lowest position in normal state, which can reduce the process of applying pressure to the piston plate 31 before adsorbing the lead frame. At the moment when the suction tube 3 contacts the lead frame, the second spring 33 is used for buffering. After the suction tube 3 adsorbs the lead frame, the space above the piston plate 31 is evacuated through the second air passage 202, which can drive the piston plate 31 to rise. During this process, the second spring 33 will be compressed, while the first spring 51 is still in a compressed state to limit the position of the sealing gasket 5 and ensure the constant volume of the space below it.

[0034] As another preferred option, such as Figure 6 , Figure 7 As shown, a third spring 43 is provided between the lower end of the swing arm 4 and the outer wall of the sleeve 2. The third spring 43 is in a compressed state to ensure that the lower end of the swing arm 4 automatically swings outward during the downward movement of the suction tube 3. The compressed state here does not compress the entire compression stroke of the third spring 43.

[0035] Preferred, such as Figures 1 to 4As shown, clamping components are arranged in pairs on both sides of the crossbeam 1. Each sleeve 2 has a rack 22 on the side facing the crossbeam 1, which is perpendicular to the axis of the sleeve 2. The crossbeam 1 has through holes for each pair of sleeves 2. The rack 22 on each pair of sleeves 2 meshes with the same gear 23 and passes through the same through hole. The gear 23 is rotatably disposed in the through hole. When adjusting the distance between the clamping components and the crossbeam 1, only one of the clamping components in the same set needs to be moved to move the other clamping component simultaneously, so that the crossbeam 1 is always in the middle position of the clamping components on both sides, so as to ensure the overall balance of the clamping tool and help improve the adjustment efficiency.

[0036] Preferred, such as Figure 1 As shown, the top of the crossbeam 1 is provided with a clamping screw 11 corresponding to at least one rack 22 of each pair of clamping components, which is used to clamp the rack 22 and prevent the position of the clamping components from changing after adjustment.

[0037] Example 2: A transfer device, including the lead frame clamping tool described in Example 1, specifically, the clamping tool can be installed on the execution end of a robotic arm.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A lead frame clamping tool, characterized in that, include: A horizontal beam (1) and clamping assemblies on both sides thereof, wherein multiple clamping assemblies are provided along the length of the beam (1); The clamping assembly includes a sleeve (2), a suction tube (3) and a swing arm (4). The suction tube (3) is coaxially inserted inside the sleeve (2). The side wall of the suction tube (3) is provided with an air hole (301) that communicates with its inner hole. The lower end of the suction tube (3) protrudes from the bottom of the sleeve (2) and is used to adsorb the lead frame. The top of the suction tube (3) is provided with a piston plate (31). Its outer circumferential wall is provided with a sliding sealing structure between it and the inner wall of the sleeve (2). The top of the piston plate (31) is provided with a push rod (32) that passes through the top plate of the sleeve (2). The side wall of the sleeve (2) is provided with a first air passage (201) located below the piston plate (31). The top of the sleeve (2) is provided with a second air passage (202) located above the piston plate (31). The first air passage (201) and the second air passage (202) are connected to the negative pressure device through independent pipes. The negative pressure suction of the second air passage (202) is greater than that of the first air passage (201). The middle section of the swing arm (4) is rotatably connected to the side of the sleeve (2) away from the crossbeam (1). The axis of the rotatable connection is set along the tangent of the sleeve (2). The upper end of the swing arm (4) is provided with an extension plate (41), the bottom surface of which is connected to the top surface of the top rod (32). The lower end of the swing arm (4) is provided with a baffle (42). The straw (3) is axially movable relative to the sleeve (2). When the straw (3) moves to the lowest position, the baffle (42) is higher than the lower end face of the straw (3). When the straw (3) moves to the highest position, the top surface of the baffle (42) is parallel to the lower end face of the straw (3) and is located below the lower end face of the straw (3) at intervals.

2. The lead frame clamping tool according to claim 1, characterized in that, The inner wall of the sleeve (2) has a stepped surface (21) with an annular structure in the middle section, which is used to limit the downward movement of the piston plate (31). The stepped surface (21) is located above the first air passage (201).

3. The lead frame clamping tool according to claim 2, characterized in that, The outer wall of the straw (3) is fitted with a sealing gasket (5), and its bottom surface is supported on the step surface (21). The inner wall of the sealing gasket (5) and the outer wall of the straw (3) are connected by a sliding seal. A first spring (51) is provided between the top surface of the sealing gasket (5) and the bottom surface of the piston plate (31). The first spring (51) is in a compressed state.

4. The lead frame clamping tool according to claim 3, characterized in that, A second spring (33) is sleeved on the outside of the push rod (32), which is located between the top surface of the piston plate (31) and the top surface of the sleeve (2). The elastic force of the second spring (33) is greater than that of the first spring (51).

5. A lead frame clamping tool according to claim 3, characterized in that, A third spring (43) is provided between the lower end of the swing arm (4) and the outer wall of the sleeve (2), and the third spring (43) is in a compressed state.

6. A lead frame clamping tool according to claim 1, characterized in that, The distance between the clamping assembly and the crossbeam (1) is adjustable.

7. A lead frame clamping tool according to claim 6, characterized in that, The clamping components are arranged in pairs on both sides of the crossbeam (1). Each sleeve (2) facing the crossbeam (1) is provided with a rack (22), which is perpendicular to the axis of the sleeve (2). The crossbeam (1) is provided with a through hole through both sides for each pair of sleeves (2). The rack (22) on the pair of sleeves (2) meshes with the same gear (23) and passes through the same through hole. The gear (23) is rotatably arranged in the through hole.

8. A lead frame clamping tool according to claim 7, characterized in that, The top of the crossbeam (1) is provided with a clamping screw (11) corresponding to at least one rack (22) of each pair of clamping components for clamping the rack (22).

9. A transfer device, characterized in that, The lead frame clamping tool includes any one of claims 1 to 8.

Images