Clamping jig for clamping ejector pins in chuck at equal height
By designing a clamping fixture containing limiting screws and positioning base, the problem of inconsistent height of the thimble is solved, and the contour clamping of the thimble on the chuck is realized, avoiding the tilt when the chip is lifted.
Patent Information
- Application Number
- CN202421986195.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The prior art is difficult to ensure that all thimbles clamped in the collet are consistent in height, resulting in a possible tilt when the chip is pinched.
A clamping fixture is designed, including a base plate, a vertical plate, a linear guide rail, a positioning base, a limiting plate and a limiting screw. The distance between the limiting plate and the collet positioning pin on the upright plate is defined by the limiting screws to ensure that the height of the thimble is consistent.
The height of all thimbles on the chuck is achieved completely consistently, avoiding the tilt phenomenon when the chip is lifted, and ensuring the contour clamping of the thimble.
Smart Images
Figure CN222939910U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a clamping fixture, in particular to a clamping fixture for equally height-clamping thimbles in a chuck. Background Art
[0002] Die bonder is a key equipment in the semiconductor back-end packaging process, and is an automated production equipment that uses vision guidance technology to automatically pick up chips from a wafer and then bond them to a lead frame. For wafer equipment, before picking up chips, standard pointed thimbles are needed to lift a part of the chips. In the case of multiple thimbles, it is necessary to ensure that the heights of multiple thimbles clamped in the chuck are exactly the same to avoid tilting when the chips are lifted. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a clamping fixture for equally height-clamping thimbles in a chuck, which can ensure that the heights of all thimbles clamped in the chuck are the same.
[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a clamping fixture for equally height-clamping thimbles in a chuck, including: a bottom plate and a vertical plate arranged on one side of the bottom plate. A linear guide rail is arranged on the bottom plate, and a positioning base is slidably arranged on the linear guide rail. The positioning base includes: a sliding mounting plate and a limiting plate vertically arranged on the sliding mounting plate; a slider matched with the linear guide rail is arranged at the bottom of the sliding mounting plate, and the slider is slidably arranged on the linear guide rail; a limiting threaded hole is opened on the limiting plate, a limiting screw is arranged in the limiting threaded hole, and a positioning pin mounting hole is opened on the vertical plate opposite to the limiting plate, and a chuck positioning pin corresponding to the chuck for clamping the thimble is arranged in the positioning pin mounting hole.
[0005] As a preferred solution, in the clamping fixture for equally height-clamping thimbles in a chuck, a thimble positioning piece is arranged on one side of the limiting plate facing the vertical plate.
[0006] As a preferred solution, in the clamping fixture for equally height-clamping thimbles in a chuck, a pair of guide rail positioning pins located on both sides of the linear guide rail are respectively arranged at both ends of the linear guide rail on the bottom plate.
[0007] As a preferred solution, in the clamping fixture for equally height-clamping thimbles in a chuck, a pair of guide rail positioning pins arranged at one end of the linear guide rail close to the vertical plate are next to the vertical plate.
[0008] As a preferred solution, in the clamping fixture for equi-height clamping of thimbles in a chuck, a locking nut is provided on the limit screw. The limit screw is first screwed with the locking nut and then screwed into the limit threaded hole on the limit plate.
[0009] The beneficial effects of the present utility model are as follows:
[0010] 1. The present utility model uses a limit screw to define the distance between the limit plate and the chuck positioning pin installed on the vertical plate, so as to ensure that the heights of all thimbles clamped on the chuck are exactly the same, realizing the equi-height clamping of thimbles.
[0011] 2. By setting a thimble positioning piece on the limit plate, the separately processed thimble positioning piece can have higher flatness, thus further ensuring the consistency of the clamping heights of all thimbles.
[0012] 3. By respectively arranging a pair of guide rail positioning pins on both sides of the linear guide rail at both ends of the bottom plate, the straightness of the linear guide rail is further ensured. When the limit plate moves, the thimbles are always perpendicular to the limit plate, further ensuring the consistency of the clamping heights of all thimbles.
[0013] 4. By pre-screwing a locking nut on the limit screw, the locking nut can be tightened after the distance between the limit plate and the vertical plate is determined, so that the limit screw is locked on the limit plate, thus ensuring the consistency of the clamping height of thimbles each time. Description of the Drawings
[0014] Figure 1 is a perspective structural view of the clamping fixture of the present utility model.
[0015] Figure 2 is a structural view of the clamping fixture of the present utility model.
[0016] Figure 3 is a structural view of the clamping fixture of the present utility model with a chuck and thimbles installed.
[0017] Figure 4 is a structural view of the clamping fixture of the present utility model for equi-height positioning of thimbles.
[0018] Figure 5 is a perspective structural view of the first type of chuck and locking cap.
[0019] Figure 6 is a perspective structural view of the second type of chuck and locking cap.
[0020] Figure 7 is a perspective structural view of the first type of thimble clamping assembly.
[0021] Figure 8 It is a schematic perspective view of the second thimble clamping assembly.
[0022] Figures 1 to 8 The reference numerals in the figure are respectively: 1, base plate; 11, linear guide rail; 111, slider; 12, guide rail positioning pin; 2, vertical plate; 3, first chuck positioning pin; 4, second chuck positioning pin; 5, thimble positioning piece; 6, positioning base; 60, sliding mounting plate; 61, limiting plate; 7, locking nut; 8, limiting screw; 9, thimble clamping assembly; 91, first chuck; 92, second chuck; 93, first locking cap; 94, second locking cap; 99, thimble. Specific embodiments
[0023] The following will describe in detail the specific implementation of a clamping jig for equally clamping a thimble in a chuck according to the present invention with reference to the accompanying drawings.
[0024] As Figure 1 and Figure 2 shown, a clamping jig for equally clamping a thimble in a chuck according to the present invention includes: a base plate 1 and a vertical plate 2 provided on one side of the base plate 1. A linear guide rail 11 is provided on the base plate 1, and a positioning base 6 is slidably provided on the linear guide rail 11. The positioning base 6 is L-shaped and includes a sliding mounting plate 60 and a limiting plate 61 vertically provided on the sliding mounting plate 60. A thimble positioning piece 5 is provided on the side of the limiting plate 61 facing the vertical plate 2. A slider 111 cooperating with the linear guide rail 11 is provided at the bottom of the sliding mounting plate 60, and the slider 111 is slidably provided on the linear guide rail 11. A limiting threaded hole is provided in the limiting plate 61, and a limiting screw 8 is provided in the limiting threaded hole of the limiting plate 61. A positioning pin mounting hole is provided in the vertical plate 2 opposite to the limiting plate 61, and a first chuck positioning pin 3 corresponding to the first chuck 91 for clamping the thimble 99 or a second chuck positioning pin 4 corresponding to the second chuck 92 for clamping the thimble 99 is provided in the positioning pin mounting hole of the vertical plate 2.
[0025] In actual application, a pair of guide rail positioning pins 12 located on both sides of the linear guide rail 11 are respectively provided at both ends of the linear guide rail 11 on the base plate 1, wherein a pair of guide rail positioning pins 12 provided at one end of the linear guide rail 11 close to the vertical plate 2 are adjacent to the vertical plate 2; the limiting screw 8 is first screwed with a locking nut 7 and then screwed into the limiting threaded hole of the limiting plate 61.
[0026] The working process of the present invention is as follows: First, move the positioning base 6 to the side away from the vertical plate 2 ( Figure 2on the right side in), then install the corresponding first collet locating pin 3 or second collet locating pin 4 into the locating pin mounting holes of the vertical plate 2, and then pre-assemble the ejector pin 99 to Figure 5 the first collet 91 shown in Figure 6 or the second collet 92 shown in, screw on the first locking cap 93 or the second locking cap 94 (not tightened) to form an ejector pin clamping assembly 9 (see Figure 3 shown), and then install the ejector pin clamping assembly 9 as a whole onto the first collet locating pin 3 or the second collet locating pin 4 that has been placed in the locating pin mounting holes of the vertical plate 2. In this way, the positioning base 6 can be moved until the end (left end) of the limit screw 8 abuts against the vertical plate 2 (see Figure 4 shown), completing the equal-height positioning of the ejector pin 99. At this time, the locking nut 7 can be tightened, and then the first locking cap 93 or the second locking cap 94 can be tightened, and the ejector pin clamping assembly 9 can be removed to perform the equal-height clamping of the next ejector pin clamping assembly 9. If the height of the currently set ejector pin 99 is inappropriate, only the locking nut 7 needs to be loosened, and the position of the limit screw 8 can be adjusted and then locked again.
[0027] In summary, only the preferred embodiments of the present invention are described above, and are not used to limit the scope of implementation of the present invention. All equivalent changes and modifications made to the shape, structure, features, and spirit described in the scope of the claims of the present invention shall be included within the scope of the claims of the present invention.
Claims
1. A clamping fixture for clamping a pin of equal height in a chuck, comprising: A base plate and a vertical plate arranged on one side of the base plate, characterized in that a linear guide rail is arranged on the base plate, and a positioning base is slidably arranged on the linear guide rail, and the positioning base comprises: a sliding mounting plate and a limiting plate vertically arranged on the sliding mounting plate; a sliding block matching the linear guide rail is arranged at the bottom of the sliding mounting plate, and the sliding block is slidably arranged on the linear guide rail; a limiting threaded hole is arranged on the limiting plate, and a limiting screw is arranged in the limiting threaded hole; a positioning pin mounting hole is arranged on the vertical plate facing the limiting plate, and a chuck positioning pin corresponding to the chuck used for clamping the ejector pin is arranged in the positioning pin mounting hole.
2. A clamping fixture for clamping ejector pins in a chuck according to claim 1, characterized in that: The limiting plate is provided with a top nail positioning piece on one side facing the vertical plate.
3. A clamping fixture for clamping ejector pins in a chuck according to claim 1, characterized in that: A pair of guide rail locating pins located on both sides of the linear guide rail are respectively arranged on the bottom plate at both ends of the linear guide rail.
4. A clamping fixture for clamping ejector pins in a chuck as claimed in claim 3, characterized in that: A pair of guide rail positioning pins arranged at one end of the linear guide rail close to the vertical plate are adjacent to the vertical plate.
5. A clamping fixture for clamping a pin of equal height in a chuck according to any one of claims 1 to 4, characterized in that: The limiting screw is provided with a locking nut, and the limiting screw is screwed into the limiting threaded hole on the limiting plate after the locking nut is screwed on first.