Four-batch-rod synchronous screw locking device

Abstract

The utility model discloses a four-batch-rod synchronous screw locking device which comprises a rotating force output unit, a driving gear, two first driven gears, four second driven gears and a gear box, each first driven gear is connected with two second driven gears in an engaged mode, a hollow rotating shaft is arranged in each second driven gear, and a batch rod is arranged in each hollow rotating shaft. The gear box body comprises a panel and a bottom plate, stepped hole positions are formed in the positions, corresponding to gear holes of the driving gear, the first driven gear and the second driven gear, of the panel and the bottom plate, and ball bearings are embedded in the stepped hole positions. The hollow rotating shaft penetrates into ball bearings above and below the corresponding second driven gear from the upper surface of the panel, the hollow rotating shaft is fixedly connected with the second driven gear, the outer diameter of the hollow rotating shaft is 0.2 mm smaller than the inner diameter of an inner ring of the ball bearings, and a gap of 0-1.2 mm is kept between a reference circle of the second driven gear and a reference circle of the meshed first driven gear; and the second driven gear is provided with a position moving space.

Description

Technical Field

[0001] This utility model relates to the field of screw locking device technology, and in particular to a four-bar synchronous screw locking device. Background Technology

[0002] During the assembly of a network server motherboard, a heatsink needs to be installed on the CPU to dissipate heat. The heatsink has a layer of thermal paste approximately 0.3mm thick. There are several ways to mount the heatsink to the CPU: some use clips to attach the heatsink to the CPU, while others use screws to secure it to a bracket and a spring to press it onto the CPU. In the screw-on-bracket method, where the heatsink is secured to the bracket and a spring presses it onto the CPU, there are usually four screws. All screws must be tightened simultaneously to ensure the thermal paste adheres horizontally to the CPU. This ensures the thermal paste evenly fills the gap between the CPU and the heatsink, achieving optimal heat dissipation. If the screws are not tightened simultaneously, the thermal paste will contact the CPU at an angle, causing the portion that initially contacts the CPU to be overcompressed and unable to evenly fill the gap, resulting in poor heat dissipation and potentially product quality issues. The current method uses an electric screwdriver to simultaneously drive four screwdriver bits to rotate and tighten screws. However, some existing radiators have loose screw holes, and due to factors such as long screw lengths and product tolerances, the screw heads may also have positional deviations. In these cases, the four fixed screwdriver bits cannot adapt to the changing screw head positions, causing interference between the bit positions and the screw positions, leading to screw jamming. Therefore, the existing four-screwdriver bit screw-tightening device needs to be optimized and improved to solve these problems. Utility Model Content

[0003] In view of this, this utility model proposes a four-barrel synchronous screw-locking device, which mainly solves the problem that the screw head position of the CPU heat sink is deviated, and the four rods of the electric screwdriver are fixed in position, which cannot adapt to the use when the screw head position is slightly deviated.

[0004] The technical solution disclosed in this utility model is a four-bar synchronous screw-locking device, comprising:

[0005] Power output unit;

[0006] A drive gear, which is connected to the power output unit;

[0007] Two first driven gears mesh with each other on the left and right sides of the drive gear axis, respectively;

[0008] Four second driven gears, each of the first driven gears meshing with two second driven gears, each second driven gear having a hollow rotating shaft inside, and each hollow rotating shaft having a set of rods fixed inside;

[0009] A gearbox body includes a front panel and a bottom plate arranged parallel to each other, a support member is provided between the front panel and the bottom plate, and stepped holes are provided on the front panel and the bottom plate at positions corresponding to the gear holes of the drive gear, the first driven gear and the second driven gear, and ball bearings are embedded in the stepped holes.

[0010] The hollow rotating shaft passes through the top of the panel and into the ball bearings above and below the corresponding second driven gear. The hollow rotating shaft and the second driven gear are fastened together. The outer diameter of the hollow rotating shaft is 0.2mm smaller than the inner diameter of the inner ring of the ball bearing, so that the second driven gear can move. A gap of 0 to 1.2mm is maintained between the pitch circle of the second driven gear and the pitch circle of the meshing first driven gear.

[0011] Furthermore, the upper end of the hollow rotating shaft is a head with an outer diameter larger than its lower end. The side wall of the head is provided with a cut that extends to the hollow inner wall of the hollow rotating shaft. The head is provided with screw holes for locking the cut, and the installed screwdriver bar is locked in place by screws.

[0012] Furthermore, the support member adopts a side support plate, and the upper and lower surfaces of the side support plate, as well as the panel and the bottom plate, are provided with through threaded holes. The panel, side support plate and bottom plate are fixed by screws connected in the through holes.

[0013] Furthermore, a mounting bracket is connected to the panel, the bottom of the mounting bracket is fixed to the top surface of the panel by screws, and the rotational power output unit is fixedly mounted on the upper end of the mounting bracket.

[0014] Preferably, the back of the mounting bracket is provided with a linear slide mechanism, which drives the mounting bracket and the connected power output unit and gearbox to move up and down as a whole.

[0015] Preferably, the rotation output unit is a servo motor or an electric screwdriver.

[0016] The four-barrel synchronous screw-locking device disclosed in this technical solution has the advantage that, through the drive gear driving the first driven gears on both sides, the drive gear rotates clockwise, causing the first driven gears to rotate counterclockwise, and then the first driven gear drives the second driven gear to rotate clockwise, thereby causing the screwdriver rod to rotate clockwise to tighten the screw. Its main innovative design is the gearbox housing that connects the drive gear, the first driven gear, and the second driven gear, wherein ball bearings are provided at the upper and lower ends of the corresponding drive gear, the first driven gear, and the second driven gear for support and limiting. Meanwhile, the hollow rotating shaft with the screwdriver bit installed is inserted into the inner ring hole of the ball bearing and the second driven gear. The second driven gear is locked to the hollow rotating shaft. The outer diameter of the hollow rotating shaft is 0.2mm smaller than the inner diameter of the ball bearing's inner ring, allowing the second driven gear some room to move. Through the design of the stepped holes in the front and back shells, a 0-1.2mm gap is maintained between the pitch circle of the second driven gear and the pitch circle of the meshing first driven gear during the movement of the second driven gear. This gap ensures that the first driven gear can drive the second driven gear, while also ensuring that the wobbling of the second driven gear during rotation does not affect the transmission between the two gears. This design allows for a 0-2mm deviation in any direction on one side at the lower end of the screwdriver bit, making the device suitable for use when the screw positions of the four screw holes on a CPU heatsink are misaligned. The screwdriver bit makes screw locking smoother and avoids screw jamming. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the assembly structure of the drive gear, the first driven gear, and the second driven gear according to an embodiment of the present utility model.

[0019] Figure 3 This is a right perspective view of the overall structure of an embodiment of the present utility model.

[0020] Figure 4 for Figure 3 A schematic diagram of the AA cross-sectional structure.

[0021] Figure 5 This is a schematic diagram of the 1.2mm gap between the pitch circle of the second driven gear and the pitch circle of the first driven gear in an embodiment of this utility model.

[0022] Figure label:

[0023] 1. Electric screwdriver; 2. Drive gear; 3. First driven gear; 4. Second driven gear; 5. Hollow rotating shaft; 501. Cutting edge; 6. Screwdriver bar; 7. Gearbox body; 701. Panel; 702. Base plate; 703. Side support plate; 8. Mounting bracket; 9. Linear slide mechanism; 10. Ball bearing. Detailed Implementation

[0024] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this disclosure.

[0025] Please refer to Figures 1 to 5 This technical solution provides a four-barrel synchronous screw-locking device, comprising a power output unit, a drive gear 2, two first driven gears 3, four second driven gears 4, a screwdriver 6, and a gearbox 7. The drive gear 2 is connected to the power output unit. The first driven gears 3 mesh with the left and right sides of the drive gear 2, which are symmetrically aligned. Each first driven gear 3 meshes with two second driven gears 4. Each second driven gear 4 contains a hollow rotating shaft 5, and a screwdriver 6 is fixed within each hollow rotating shaft 5. The gearbox 7 includes a panel 701 and a base plate 702 arranged parallel to each other. A support member is provided between the panel 701 and the base plate 702. Stepped holes are provided on the panel 701 and the base plate 702 corresponding to the gear holes of the drive gear 2, the first driven gears 3, and the second driven gears 4. Ball bearings 10 are embedded in the stepped holes.

[0026] The hollow rotating shaft 5 passes through the top of the panel 701 and into the ball bearings 10 above and below the corresponding second driven gear 4. The hollow rotating shaft 5 and the second driven gear 4 are fastened together. The outer diameter of the hollow rotating shaft 5 is 0.2 mm smaller than the inner diameter of the inner ring of the ball bearing 10. For example, if the outer diameter of the hollow rotating shaft 5 is 11.8 mm and the inner diameter of the inner ring of the ball bearing 10 is 12 mm... Figure 4 As shown), the second driven gear 4 is movable, and a gap of 0 to 1.2 mm is maintained between the pitch circle of the second driven gear 4 and the pitch circle of the meshing first driven gear 3. Figure 5 (As shown). This gap ensures that the first driven gear 3 can drive the second driven gear 4, and also ensures that the wobbling of the second driven gear 4 during rotation will not affect the transmission between the two gears. This allows the lower end of the screwdriver 6 to have a deviation of 0-2mm on one side in any direction. Therefore, this device is suitable for use when the screw positions of the four screw holes on a CPU heatsink are misaligned, making screw tightening smoother and avoiding screw jamming.

[0027] Please refer to Figures 2 to 4 Preferably, the upper end of the hollow rotating shaft 5 is a head with an outer diameter larger than its lower end. The side wall of the head is provided with a cutout 501 extending to the hollow inner wall of the hollow rotating shaft 5. The head is provided with screw holes for locking the cutout 501, and the installed screwdriver rod 6 is locked by screws.

[0028] The support member adopts a side support plate 703. The upper and lower surfaces of the side support plate 703, as well as the panel 701 and the base plate 702, are provided with through threaded holes. The panel 701, the side support plate 703, and the base plate 702 are fixed by screws connected in the through holes. Preferably, the panel 701, the base plate 702, and the side support plate 703 form a rectangular gearbox body 7.

[0029] In a preferred embodiment, a mounting bracket 8 is connected to the panel 701. The bottom of the mounting bracket 8 is fixed to the top surface of the panel 701 by screws, and the rotational power output unit is fixed to the upper end of the mounting bracket 8. A handle for holding the device can also be installed on the mounting bracket 8, enabling a handheld four-bar lever 6 synchronous screw-locking device.

[0030] In another preferred embodiment, the mounting bracket 8 is provided with a linear slide mechanism 9 on its back. The linear slide mechanism 9 drives the mounting bracket 8 and the connected power output unit and gearbox 7 to move up and down as a whole. The linear slide mechanism 9 can be fixed on a workbench or a processing position on a production line to enable the device to be applied to an automated screw fastening mechanism.

[0031] Preferably, the rotation output unit adopts a servo motor or an electric screwdriver 1. The embodiment shown in the above embodiments and the accompanying drawings is the embodiment using an electric screwdriver 1. The output end of the electric screwdriver 1 is also connected to a screwdriver rod 6 and a hollow rotating shaft 5. The hollow rotating shaft 5 locks the screwdriver rod 6 and is inserted into the drive gear 2. The hollow rotating shaft 5 locks the drive gear 2. In this solution, the screwdriver rod 6 and the hollow rotating shaft 5 are the same parts, which can be mass-produced and help save costs.

[0032] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A four batch rod synchronous locking screw device, characterized in that, The utility model relates to a rotating force output unit, a drive gear connected to the rotating force output unit, two first driven gears symmetrically connected to the left and right sides of the drive gear, four second driven gears, each first driven gear being connected to two second driven gears, each second driven gear having a hollow rotating shaft, and each hollow rotating shaft having a batch of rods fixedly arranged therein. The utility model relates to a gear box including a panel and a bottom plate arranged in parallel, a support arranged between the panel and the bottom plate, stepped hole positions corresponding to gear holes of the drive gear, the first driven gear and the second driven gear being arranged on the panel and the bottom plate, and ball bearings being arranged in the stepped hole positions. The hollow rotating shaft passes through the upper surface of the panel and is arranged in the ball bearings above and below the corresponding second driven gear, the hollow rotating shaft is tightly connected to the second driven gear, the outer diameter of the hollow rotating shaft is 0.2mm smaller than the inner diameter of the inner ring of the ball bearing, the second driven gear is movable, and a gap of 0-1.2mm is maintained between the index circle of the second driven gear and the index circle of the first driven gear. The upper end of the hollow rotating shaft is a head having a larger outer diameter than the lower end, the side wall of the head is provided with a cutout extending to the hollow inner wall of the hollow rotating shaft, the head is provided with a screw hole position for locking the cutout, and the installed rods are locked by a screw. The support is a side support plate, the upper and lower surfaces of the side support plate and the panel and the bottom plate are provided with threaded through holes, and the panel, the side support plate and the bottom plate are fixed by screw connection. The panel is connected to a mounting bracket, the bottom of the mounting bracket is fixed to the top surface of the panel by screw connection, and the upper end of the mounting bracket is connected to the rotating force output unit. The back of the mounting bracket is provided with a linear slide mechanism, the mounting bracket, the rotating force output unit and the gear box are driven to move up and down by the linear slide mechanism.

2. The four-batch rod synchronous lock screw device according to claim 1, characterized in that, The rotating force output unit is a servo motor or an electric screwdriver.

3. The four-batch rod synchronous locking screw device according to claim 1, characterized in that, ​ 4. The four-batch rod synchronous lock screw device according to claim 1, characterized in that, ​ 5. The four-batch rod synchronous lock screw device according to claim 4, characterized in that, ​ 6. The four-batch screw synchronization locking device according to any one of claims 1-5, wherein, ​

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