A lifting device for a crystal bonding machine

Abstract

The present invention discloses a lifting device for a crystal bonder, which is used to solve the technical problems in the prior art of using multiple sets of motors to control lifting, resulting in low equipment utilization, complex structure, and cumbersome operation. The present invention includes a drive shaft, and a first cam is fixedly connected to each end of the drive shaft; the first cam is abutted against a first cam follower on one side of its top, and the first cam follower is connected to a first lifting assembly; a lifting shaft is installed between the two first lifting assemblies, and a plurality of material-dispensing assemblies are arranged on the lifting shaft at intervals; a second cam is also sleeved on the drive shaft; the second cam is abutted against a second cam follower on one side of its top, and the second cam follower is connected to a clamping assembly. The above design uses a drive shaft to synchronously drive the material-dispensing assembly and the clamping assembly to perform lifting movements, thereby improving the utilization rate of the crystal bonder equipment and the production efficiency of semiconductor chips.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor device preparation, and in particular to a lifting device for a crystal bonding machine. Background Art

[0002] A die bonder is a piece of equipment used to prepare semiconductor chips and is crucial to the semiconductor packaging process. Using vision-guided technology, the die bonder automatically picks the chip from the wafer and bonds it to the lead frame. The lead frame is then cyclically fed back and forth, while the lead frame is held tightly during the bonding process.

[0003] Existing technology typically uses two motors and connecting rods to control the lead frame's lift and compression, and the lead frame's material removal and lift. This dual-motor control not only complicates the die bonder's structure and operation, but also increases its operating and subsequent maintenance costs, contradicting energy-saving and green production requirements.

[0004] Therefore, finding a lifting device for a crystal bonding machine that can solve the above technical problems has become an important topic studied by those skilled in the art. Summary of the Invention

[0005] The invention discloses a lifting device for a crystal bonding machine, which is used to solve the technical problems in the prior art of using multiple sets of motors to control lifting, resulting in low equipment utilization, complex structure and cumbersome operation.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A lifting device for a crystal bonder includes a drive shaft, with a first cam fixedly connected to each end of the drive shaft; a first cam follower abuts against a top side of the first cam, and the first cam follower is connected to a first lifting assembly; a lifting shaft is installed between two first lifting assemblies, and a plurality of material shifting assemblies are arranged on the lifting shaft at intervals;

[0008] The driving shaft is also sleeved with a second cam; the second cam is abutted against a second cam follower on one side of the top thereof, and the second cam follower is connected to a clamping assembly.

[0009] Optionally, when the drive shaft is driven to rotate, the movement directions of the material-moving assembly and the pressing assembly are opposite.

[0010] Optionally, the first lifting assembly includes a material digging base, the material digging base is provided with a material digging slide rail, and the material digging slide rail is slidably connected to a material digging slider;

[0011] The side of the material-dipping slider away from the material-dipping base is fixedly connected to a bearing fixing plate, the side of the bearing fixing plate away from the material-dipping base is fixedly connected to a bearing, and the bearings of the two first lifting assemblies are respectively connected to the two ends of the lifting shaft.

[0012] Optionally, a material shifting fixing plate is fixedly connected to a side of the bearing fixing plate facing the first cam, and the first cam follower is mounted on the material shifting fixing plate.

[0013] Optionally, a tension spring is provided on the side of the bearing fixing plate away from the first cam, one end of the tension spring is fixedly connected to the top end of the bearing fixing plate, and the other end of the tension spring is fixedly connected to the bottom end of the material diverting base.

[0014] Optionally, the second cam follower is connected to the pressing assembly via a second lifting assembly;

[0015] The second lifting assembly includes a pressing base, a lifting platform is slidably connected to a side of the pressing base close to the pressing assembly, and a plurality of mounting holes for fixedly connecting the pressing assembly are opened on the lifting platform;

[0016] A pressing and fixing plate is fixedly connected to both sides of the lifting platform, and the second cam follower is installed on the pressing and fixing plate.

[0017] Optionally, a pressing slider is provided on the side of the lifting platform facing the pressing base, and the pressing base is provided with a pressing slide rail at a position corresponding to the pressing slider, and the pressing slider is slidably connected to the pressing slide rail.

[0018] Optionally, it further includes a supporting base plate, to which a spring support is fixedly connected, to which a compression spring is fixedly connected, and one end of the compression spring away from the spring support is fixedly connected to the lifting platform.

[0019] Optionally, a motor mounting plate is provided on the support base plate, and a motor is mounted on the motor mounting plate;

[0020] The output end of the motor is connected to the drive shaft through a synchronous pulley.

[0021] Optionally, at least one bearing seat for mounting the drive shaft is provided on the supporting base plate.

[0022] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0023] When the driving shaft is driven to rotate, the first cam and the second cam rotate accordingly, thereby driving the first cam follower and the second cam follower to perform lifting movements; when the first cam follower moves, it drives the lifting shaft and the material-dispensing assembly on the lifting shaft to move, and when the second cam follower moves, it drives the clamping assembly to move, thereby achieving the purpose of synchronously raising or lowering the material-dispensing assembly and the clamping assembly by a single driving shaft.

[0024] Compared with the prior art, the present invention provides a cam on the driving shaft and a cam follower that cooperates with the cam. When the driving shaft is driven to rotate, the material-prying assembly and the pressing assembly connected to the cam follower are caused to perform lifting movements, thereby overcoming the defect of multiple sets of driving mechanisms to control the lifting and lowering of the material-prying assembly and the pressing assembly, and improving the utilization rate of the equipment. At the same time, it adopts a simple structural design, which is easy to install and operate, and is more suitable for crystal bonding machine equipment to perform material-prying and pressing operations on lead frames, thereby improving the production efficiency of semiconductor chips. BRIEF DESCRIPTION OF THE DRAWINGS

[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 a lifting device for a crystal bonding machine;

[0027] Figure 2 It is a structural diagram of the drive shaft and cam;

[0028] Figure 3 is a side view of the first lifting assembly;

[0029] Figure 4 is a front view of the first lifting assembly;

[0030] Figure 5 is a front view of the second lifting assembly;

[0031] Figure 6 is a top view of the second lifting assembly;

[0032] Figure 7 is a schematic diagram of the cam;

[0033] Illustrations: first lifting assembly 1, second lifting assembly 2, material dispensing assembly 3, clamping assembly 4, tension spring 5, clamping spring 6, support base 7, spring pillar 8, drive shaft 10, first cam 11, first cam follower 12, second cam 13, second cam follower 14, motor 15, synchronous pulley 16, material dispensing base 101, material dispensing slide rail 102, material dispensing slider 103, bearing fixing plate 104, material dispensing fixing plate 105, bearing 106, lifting shaft 107, clamping base 201, clamping slide rail 202, clamping slider 203, lifting platform 204, clamping fixing plate 205, motor mounting plate 71, bearing seat 72, rotation center 300, highest point 301, lowest point 302. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two elements or interactions between two elements. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features.

[0036] A lifting device for a crystal bonder includes a drive shaft 10, with a first cam 11 fixedly connected to each end of the drive shaft 10; a first cam follower 12 abuts against the top side of the first cam 11, and the first cam follower 12 is connected to a first lifting assembly 1; a lifting shaft 107 is installed between the two first lifting assemblies 1, and a plurality of material shifting assemblies 3 are arranged at intervals on the lifting shaft 107;

[0037] A second cam 13 is sleeved on the driving shaft 10 ; a second cam follower 14 is abutted on one side of the top of the second cam 13 , and the second cam follower 14 is connected to the pressing assembly 4 .

[0038] Specifically, when the drive shaft 10 is driven to rotate, the first cam 11 at both ends of the drive shaft 10 and the second cam 13 sleeved on the drive shaft 10 rotate accordingly, thereby driving the first cam follower 12 and the second cam follower 14 to perform lifting movements; because the first cam follower 12 can drive the lifting shaft 107 to move, and the lifting shaft 107 is provided with a material-prying assembly 3, when the first cam follower 12 performs lifting movements, the material-prying assembly 3 also performs lifting movements; and because the second cam follower 14 is connected to the clamping assembly 4, when the second cam follower 14 performs lifting movements, the clamping assembly 4 also performs lifting movements, thereby achieving the purpose of using a single drive shaft 10 to drive the material-prying assembly 3 and the clamping assembly 4 to lift and lower synchronously.

[0039] It should be noted that the lifting motion in this embodiment is defined as a motion perpendicular to the driving shaft 10, moving toward or away from the driving shaft 10. Figure 7 The first cam 11 and the second cam 13 are both provided with a rotation center 300 for inserting the drive shaft 10, and the first cam 11 and the second cam 13 are both eccentric circular plate structures, that is, the distances from the rotation center 300 to the circumferential sides of the first cam 11 and the second cam 13 are different, and the cam has a highest point 301 and a lowest point 302.

[0040] Specifically, the drive shaft 10 is inserted from the rotation center 300 and fixedly mounts the first cam 11 and the second cam 13. During cam rotation, the positions of the highest point 301 and the lowest point 302 change, and the follower changes height based on these changes, causing the follower to move up and down. When the first cam 11 rotates and the first cam follower 12 abuts the highest point 301 of the first cam 11, the lifting shaft 107 is at its highest point in the ascending position; when the first cam follower 12 abuts the lowest point 302 of the first cam 11, the lifting shaft 107 is at its lowest point in the descending position. The second cam 13 operates on the same principle as the first cam 11 and will not be further described here.

[0041] Furthermore, when the driving shaft 10 is driven to rotate, the moving directions of the material-moving assembly 3 and the pressing assembly 4 are opposite.

[0042] Specifically, the highest point 301 of the first cam 11 and the highest point 301 of the second cam 13 are initially positioned in opposite directions. For example, when the highest point 301 of the first cam 11 is positioned upward and perpendicular to the drive shaft 10, the highest point 301 of the second cam 13 is positioned downward and perpendicular to the drive shaft 10. This design allows the lifting and lowering states of the material-dispensing assembly 3 and the pressing assembly 4 to be opposite. When the pressing assembly 4 rises, the material-dispensing assembly 3 descends synchronously, simplifying operation and improving product production efficiency.

[0043] Furthermore, the first lifting assembly 1 includes a material digging base 101, a material digging slide rail 102 is provided on the material digging slide rail 102, and a material digging slider 103 is slidably connected to the material digging slide rail 102;

[0044] The side of the material-diverting slider 103 away from the material-diverting base 101 is fixedly connected to a bearing fixing plate 104, and the side of the bearing fixing plate 104 away from the material-diverting base 101 is fixedly connected to a bearing 106. The bearings 106 of the two first lifting assemblies 1 are respectively connected to the two ends of the lifting shaft 107.

[0045] Furthermore, a material shifting fixing plate 105 is fixedly connected to a side of the bearing fixing plate 104 facing the first cam 11 , and the first cam follower 12 is mounted on the material shifting fixing plate 105 .

[0046] Specifically, when the first cam follower 12 performs a lifting motion, it drives the material-moving fixing plate 105 to move, and simultaneously causes the bearing fixing plate 104 to perform a lifting motion accordingly.

[0047] Specifically, the material dispensing base 101 is fixedly mounted on the support base 7. A material dispensing slider 103 is fixedly connected to the side of the bearing fixing plate 104 facing the material dispensing base 101. The material dispensing slider 103 and the material dispensing rail 102 enable the bearing fixing plate 104 to be slidably connected to the material dispensing base 101. The bearing fixing plate 104 is also fixedly connected to a bearing 106, which is connected to a lifting shaft 107. When the bearing fixing plate 104 is raised or lowered, the bearing 106 and the lifting shaft 107 move accordingly. During operation, the material dispensing assembly 3 is raised and lowered along with the lifting shaft 107, and a cyclic material dispensing operation can be performed on the lead frame bonded with the semiconductor chip, ensuring smooth packaging of the semiconductor chip.

[0048] Furthermore, a tension spring 5 is provided on the side of the bearing fixing plate 104 away from the first cam 11 , one end of the tension spring 5 is fixedly connected to the top of the bearing fixing plate 104 , and the other end of the tension spring 5 is fixedly connected to the bottom end of the material digging base 101 .

[0049] Specifically, one end of the tension spring 5 is fixedly connected to the bearing fixing plate 104, and the other end is fixedly connected to the material tapping base 101. This is to provide a downward spring tension to the bearing fixing plate 104, so that the bearing fixing plate 104 is always subjected to the downward tension of the tension spring 5 during the sliding process on the material tapping slide rail 102, thereby keeping the first cam follower 12 in close contact with the top side of the first cam 11 at all times.

[0050] Furthermore, the second cam follower 14 is connected to the pressing assembly 4 via the second lifting assembly 2;

[0051] The second lifting assembly 2 includes a pressing base 201, and a lifting platform 204 is slidably connected to the side of the pressing base 201 close to the pressing assembly 4. The lifting platform 204 is provided with a plurality of mounting holes for fixedly connecting the pressing assembly 4;

[0052] A pressing plate 205 is fixedly connected to both sides of the lifting platform 204 , and the second cam follower 14 is mounted on the pressing plate 205 .

[0053] Specifically, the clamping base 201 is fixedly installed on the supporting base plate 7, the clamping base 201 is slidably connected to the lifting platform 204, and a clamping fixing plate 205 is fixedly connected to both sides of the lifting platform 204. The second cam follower 14 is installed on the clamping fixing plate 205. During the movement of the second cam follower 14, it can drive the lifting platform 204 to perform lifting and lowering movements, and the clamping assembly 4 will perform lifting and lowering movements accordingly.

[0054] It should be noted that the lead frame needs to be compressed during the bonding stage of the semiconductor chip. The above design integrates the operating procedures of compressing and shifting the lead frame, and simultaneously realizes the functions of shifting and compressing, thereby improving the utilization rate of the die bonding machine equipment and the production efficiency of semiconductor chips.

[0055] Furthermore, a pressing slider 203 is provided on the side of the lifting platform 204 facing the pressing base 201 , and a pressing rail 202 is provided on the pressing base 201 at a position corresponding to the pressing slider 203 , and the pressing slider 203 is slidably connected to the pressing rail 202 .

[0056] Specifically, a pressing slider 203 is fixedly connected to the side of the lifting platform 204 facing the second cam 13 , and the lifting platform 204 is slidably connected to the pressing base 201 through the pressing slider 203 and the pressing rail 202 .

[0057] Furthermore, the lifting device also includes a supporting base plate 7, to which a spring support 8 is fixedly connected. The spring support 8 is fixedly connected to a compression spring 6, and one end of the compression spring 6 away from the spring support 8 is fixedly connected to the lifting platform 204.

[0058] Specifically, one end of the compression spring 6 is connected to a spring pillar 8 provided on the support base plate 7, and the other end of the compression spring 6 is connected to another spring pillar 8 provided on the side of the lifting platform 204 facing the clamping base 201. This is to provide a downward spring tension to the lifting platform 204, so that the lifting platform 204 is always subjected to the downward tension of the compression spring 6 during the sliding process on the clamping slide rail 202, thereby keeping the second cam follower 14 in close contact with the top side of the second cam 13 at all times.

[0059] Furthermore, a motor mounting plate 71 is provided on the support base plate 7, and a motor 15 is mounted on the motor mounting plate 71;

[0060] The output end of the motor 15 is connected to the drive shaft 10 via a synchronous pulley 16 .

[0061] Specifically, the motor 15 is connected to the synchronous pulley 16 through a synchronous belt or a conveyor belt. When the motor 15 is started, the synchronous pulley 16 rotates, and the drive shaft 10 rotates accordingly, thereby driving the first cam 11 and the second cam 13 to rotate; the motor 15 is installed on the motor mounting plate 71 to ensure that the support base plate 7 does not shake during use, which affects the product quality and the stability of the device.

[0062] Furthermore, at least one bearing seat 72 for mounting the drive shaft 10 is provided on the supporting base plate 7 .

[0063] Specifically, the bearing seat 72 is fixed on the supporting base plate 7 to support the driving shaft 10 to maintain stability.

[0064] Note that the above embodiments are merely preferred embodiments of the present invention and the technical principles employed, and are not intended to limit the present invention. A person skilled in the art, based on the principles of the present invention, can make various obvious changes, readjustments, and substitutions to the technical solutions described in the above embodiments without departing from the scope of protection of the present invention. Therefore, this specification should not be construed as limiting the present invention.

Claims

1. A lifting device for a crystal bonding machine, characterized in that: The invention comprises a driving shaft (10), wherein both ends of the driving shaft (10) are fixedly connected to a first cam (11); a first cam follower (12) is abutted on one side of the top of the first cam (11), and the first cam follower (12) is connected to a first lifting assembly (1); a lifting shaft (107) is installed between the two first lifting assemblies (1), and a plurality of material shifting assemblies (3) are arranged on the lifting shaft (107) at intervals; The drive shaft (10) is also sleeved with a second cam (13); the second cam (13) is abutted against a second cam follower (14) on one side of its top, and the second cam follower (14) is connected to a pressing assembly (4); The first lifting assembly (1) comprises a material diverting base (101), a material diverting slide rail (102) is provided on the material diverting base (101), and a material diverting slider (103) is slidably connected to the material diverting slide rail (102); A bearing fixing plate (104) is fixedly connected to the side of the material-dispensing slider (103) away from the material-dispensing base (101), and a bearing (106) is fixedly connected to the side of the bearing fixing plate (104) away from the material-dispensing base (101). The bearings (106) of the two first lifting assemblies (1) are respectively connected to the two ends of the lifting shaft (107); The second cam follower (14) is connected to the pressing assembly (4) via a second lifting assembly (2); The second lifting assembly (2) comprises a pressing base (201), a lifting platform (204) is slidably connected to a side of the pressing base (201) close to the pressing assembly (4), and the lifting platform (204) is provided with a plurality of mounting holes for fixedly connecting the pressing assembly (4); A pressing and fixing plate (205) is fixedly connected to each side of the lifting platform (204), and the second cam follower (14) is mounted on the pressing and fixing plate (205).

2. The lifting device for a crystal bonding machine according to claim 1, characterized in that: When the driving shaft (10) is driven to rotate, the moving directions of the material shifting assembly (3) and the pressing assembly (4) are opposite.

3. The lifting device for a crystal bonding machine according to claim 1, characterized in that: A material shifting fixing plate (105) is fixedly connected to a side of the bearing fixing plate (104) facing the first cam (11), and the first cam follower (12) is mounted on the material shifting fixing plate (105).

4. The lifting device for a crystal bonding machine according to claim 1, characterized in that: A tension spring (5) is provided on the side of the bearing fixing plate (104) away from the first cam (11), one end of the tension spring (5) is fixedly connected to the top end of the bearing fixing plate (104), and the other end of the tension spring (5) is fixedly connected to the bottom end of the material-dispensing base (101).

5. The lifting device for a crystal bonding machine according to claim 1, characterized in that: A pressing slider (203) is provided on the side of the lifting platform (204) facing the pressing base (201); a pressing rail (202) is provided on the pressing base (201) at a position corresponding to the pressing slider (203); and the pressing slider (203) is slidably connected to the pressing rail (202).

6. The lifting device for a crystal bonding machine according to claim 1, characterized in that: It also includes a supporting base plate (7), a spring support (8) fixedly connected to the supporting base plate (7), a compression spring (6) fixedly connected to the spring support (8), and an end of the compression spring (6) away from the spring support (8) fixedly connected to the lifting platform (204).

7. The lifting device for a crystal bonding machine according to claim 6, characterized in that: A motor mounting plate (71) is provided on the supporting base plate (7), and a motor (15) is mounted on the motor mounting plate (71); The output end of the motor (15) is connected to the drive shaft (10) via a synchronous pulley (16).

8. The lifting device for a crystal bonder according to claim 6, characterized in that: At least one bearing seat (72) for mounting the drive shaft (10) is provided on the supporting base plate (7).

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