Handheld assembly tool for interference press fitting of small plug-in and small socket

Abstract

A handheld assembly tool for interference press fitting of a small plug-in and a small socket comprises an installation support, a cam, a pressing head, an adjustable supporting rod, a handle, a pressing rod and a first spring. The cam is provided with a front end part and a tail part, the front end part is hinged to the cam connecting part, the tail part is connected with a pressing rod, and the cam can rotate around a hinge point; the upper end of the pressure head is in contact with the cam, and the lower end of the pressure head abuts against the small plug-in; the first spring is assembled between the pressure head and the mounting support; the adjustable supporting rod is connected to the lower end of the mounting support through threads; the handle is fixed on the handle connecting part; and an anti-falling mechanism is also arranged. The interference press-fitting device has the advantages that interference press-fitting can be accurately controlled under the condition that no external power exists, and the yield reaches 98%; 2, the weight of the tool is only 0.68 kg, the operation is convenient, and the assembly efficiency is improved by 50%; 3, the stroke is adjusted in a self-adaptive mode. The floating design of the anti-falling baffle ring is suitable for parts with different tolerances, and the anti-falling baffle ring is continuously adjustable within 0-10 mm. And 4, the compatibility is good, the device is suitable for multi-model assembly parts, and the quick switching of the assembly parts of different models can be completed within 60 seconds. And 5, the manufacturing cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical assembly tools, and in particular relates to a handheld installation tool suitable for interference fit assembly of small parts, in particular for press-fit assembly of small plug-ins and small sockets. Background Art

[0002] In the field of mechanical assembly technology, interference fit is a common connection method widely used in the fixed assembly of precision parts. In the existing technology, mainstream assembly tools can be divided into two categories: hydraulic drive and motor drive, but both have significant limitations and are difficult to meet the operational requirements in complex scenarios.

[0003] Hydraulically driven tools use a hydraulic system to generate high pressure to push the pressure head to complete assembly. The core problem lies in the complexity of the system. The integration of hydraulic pumps, pipelines and control valves results in a large overall size of the tool, which is difficult to operate flexibly, especially in confined spaces (such as the internal cavity of the equipment or densely arranged mechanical structures). In addition, the hydraulic system requires regular maintenance to prevent oil leakage, which not only increases the cost of use, but also limits its application in clean environments (such as electronic component assembly workshops). More importantly, the dynamic response of the hydraulic drive is delayed, and it is impossible to achieve real-time control of high-precision pressing force, which can easily cause surface damage to parts or improper assembly.

[0004] Motor-driven tools provide pressure through electric motors driving screws or gear mechanisms. Although this improves control accuracy to a certain extent, it is still limited by its own structural defects. The built-in motor and reduction mechanism significantly increase the weight of the tool, and long-term hand-held operation can easily cause fatigue and affect assembly stability. At the same time, its press-fitting stroke adjustment mostly relies on mechanical limit devices, which have a limited adjustment range and cumbersome operation, making it difficult to adapt to assembly requirements with different interference fits (such as from micron-level precision instruments to millimeter-level heavy mechanical locks). In addition, the pressure head and lock seat fixture of traditional tools are mostly rigidly connected, with poor adaptability to part size tolerances, requiring frequent mold replacement or fixture adjustment, which seriously restricts assembly efficiency.

[0005] The above technical defects have resulted in the existing tools being seriously inadequately applicable in narrow space, high-precision, and multi-model mixed-line assembly scenarios. Production requires a small parts interference fit assembly tool that can achieve precise control of the press force without external power, adaptive stroke adjustment, fast switching of multiple models, and high assembly efficiency. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a handheld assembly tool for interference press fitting of a small plug-in unit and a small socket.

[0007] The present invention adopts the following technical scheme, including a mounting support, a cam, a pressure head, an adjustable support rod, a handle, a pressure rod, and a first spring; the mounting support is provided with a cam connecting portion, a pressure head sleeve seat portion, a handle connecting portion and a tiger's mouth portion; the cam is provided with a front end portion and a tail portion, the front end portion is hinged to the cam connecting portion, and the cam can rotate around the hinge point; the inner circle size of the pressure head and the pressure head sleeve seat portion match, the upper end of the pressure head contacts the cam, and the lower end of the pressure head is used to abut against a small plug-in; the first spring is assembled between the pressure head and the pressure head sleeve seat portion; the adjustable support rod is threadedly connected to the lower end of the tiger's mouth portion; the handle is fixed to the handle connecting portion; the pressure rod is fixed to the tail of the cam; and an anti-slip mechanism is also provided.

[0008] The present invention is based on the principle of pure mechanical transmission, abandoning the hydraulic or motor drive structure, and providing an assembly interface through the jaws of the mounting support. The first spring can realize the automatic resetting of the pressure head; the adjustable support rod can adjust the setting height through the nut to control the pressing stroke; the handle is used for holding and supporting; the pressure rod is used to apply the pressing torque. A complete force transmission chain of "torque input → cam conversion → pressure head execution → spring reset" is formed, and finally the stable pressing of small plug-ins is realized within the stroke range limited by the adjustable support rod. The jaws are adapted to parts of different sizes; the cam is hinged to the cam connecting part, and the torque of the pressure rod is converted into the linear displacement of the pressure head through the cam; the anti-slip mechanism can prevent the small plug-in from falling out during assembly.

[0009] The present invention can provide an efficient solution for interference fit assembly in narrow spaces and complex working conditions. The working principle is specifically analyzed as follows: 1. Torque conversion mechanism: The pressure rod is fixed to the tail of the cam. When the operator presses down the pressure rod, a downward pressure torque is generated; the hinge point of the front end of the cam and the cam connection part forms a fulcrum, which transmits the torque to the curved surface where the cam and the pressure head contact, and further converts it into a downward linear force of the pressure head, achieving a lever amplification effect of a small operating force to produce a large pressing force; 2. Pressing execution module: The pressure head and the inner circle of the pressure head seat are precisely matched to ensure the stability of the axial motion trajectory; the first spring is pre-compressed and assembled between the pressure head and the pressure head seat. When the pressure rod is released, the spring tension drives the pressure head to automatically return to the initial position, completing a pressing cycle; 3. Anti-slip locking function Function: The anti-slip mechanism can prevent small plug-ins in assembly from being laterally offset or falling out under pressure; 4. Stroke adjustment system: The adjustable support rod is installed at the lower end of the tiger's mouth through a threaded connection. Rotating the nut can change the height of the adjustable support rod, directly controlling the downward stroke H of the pressure head (H=the distance between the top of the adjustable support rod and the initial position of the pressure head) to adapt to assembly requirements with different strokes; 5. Human-computer interaction design: The handle is fixed to the handle connection to provide a holding fulcrum for the operator; the spatial layout of the pressure rod and the handle forms a clamp-like structure, which is in line with the one-handed operation habit, ensuring that the force direction is aligned with the press axis to avoid tool jamming caused by off-center loading.

[0010] One improvement is that the anti-slip mechanism includes a retaining ring, a second spring, an upper positioning clamp and a lower positioning clamp, the upper positioning clamp is positioned at the middle of the pressure rod through a slot, the lower positioning clamp is positioned at the lower end of the pressure rod through a slot, the upper end of the retaining ring is provided with a step hole matching the lower positioning clamp, the retaining ring is movably assembled at the lower end of the pressure rod through the second spring, the upper positioning clamp and the lower positioning clamp; the inner cavity shape and size of the retaining ring match the shape and size of the small plug-in, and a floating gap is provided between the retaining ring and the pressure head, allowing the retaining ring to float up and down and left and right. During the assembly process, the anti-slip mechanism can effectively prevent the small plug-in from falling out. The retaining ring is movably sleeved on the lower end of the pressure head, and its inner cavity covers the outer edge of the small plug-in, forming a physical limit during the press-fitting process to prevent the small plug-in from lateral displacement or falling out under pressure, and the retaining ring can float to adjust its position.

[0011] The second improvement is that the anti-slip mechanism includes a retaining ring, which is threadedly connected to the upper end of the adjustable support rod. The retaining ring is sleeved on the upper end of the adjustable support rod (the upper end of the retaining ring is flush with the upper end of the adjustable support rod under normal conditions), and the retaining ring can be rotated to move up to the working position to cover the small plug-in.

[0012] The third improvement is that the anti-slip mechanism includes a retaining ring, which is threadedly connected to the lower end of the pressure head. The retaining ring is sleeved on the lower end of the pressure head (the lower end of the retaining ring is flush with the lower end of the pressure head under normal conditions), and the retaining ring can be rotated to move down to the working position to cover the small plug-in.

[0013] Another improvement is that the upper end of the adjustable support rod is provided with a groove matching the shape of the small plug-in seat. The adaptable design of the groove at the upper end of the adjustable support rod supports the rapid switching of multiple small plug-in seat models, and the versatility is significantly improved.

[0014] Another improvement is that the curved surface where the cam contacts the pressure head is an involute curved surface. This structure can ensure a smooth transition between the pressure head moving distance H and the pressure rod pressing angle θ. The involute cam curved surface design makes the pressure head travel error small and the pressure torque fluctuation small, ensuring a smooth and impact-free press-fitting process, which is suitable for high-precision scenarios such as precision electronic components.

[0015] A further improvement is that the handle tail end is provided with an anti-slip angle, and the arc of the anti-slip angle matches the ergonomic grip curve. The handle tail end angle design conforms to the ergonomic grip curve, which can significantly improve the operation stability and safety, and effectively prevent parts damage caused by tool slippage.

[0016] The present invention has the following advantages: 1. Precise control of the press-fitting force can be achieved without external power, achieving the design requirement of high reliability. The present invention realizes the interference fit of small plug-ins and lock seats in a narrow space, reduces the downward pressure torque fluctuation by 40%, reduces the risk of assembly misalignment, and achieves a yield rate of 98%. 2. The handheld tool is lightweight (the product weight of one embodiment is 0.68kg), easy to operate, and the assembly efficiency is improved by more than 50%. 3. Adaptive stroke adjustment. The floating design of the anti-disengagement ring is suitable for parts with different tolerances and is continuously adjustable within 0-10mm. 4. Good compatibility, suitable for multiple types of assembly parts, and can complete the rapid switching of different types of assembly parts within 60 seconds. 5. It adopts a modular structure with low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 AA cross-sectional structure schematic diagram.

[0019] Figure 3 The figure is a schematic cross-sectional structural diagram of an embodiment of the present invention.

[0020] Figure 4 The figure is a schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0021] Figure 5 for Figure 3 A partially enlarged structural schematic diagram (showing the working principle of the first anti-slip mechanism embodiment).

[0022] Figure 6 It is a structural schematic diagram of a second anti-slip mechanism embodiment of the present invention.

[0023] Figure 7 It is a structural schematic diagram of a third anti-slip mechanism embodiment of the present invention.

[0024] Among them: mounting support 1, cam 2, pressure head 3, adjustable support rod 4, handle 5, pressure rod 6, first spring 7, cam connecting part 8, pressure head sleeve seat part 9, handle connecting part 10, tiger's mouth part 11, small plug-in 12, small plug-in seat 13, nut 14, retaining ring 15, second spring 16, upper positioning clamp 17, lower positioning clamp 18, step mouth 19, anti-slip mechanism 20, front end part 21, tail part 22, groove 23. DETAILED DESCRIPTION

[0025] like Figures 1 to 7As shown, an embodiment of the present invention adopts the following technical scheme, including a mounting support 1, a cam 2, a pressure head 3, an adjustable support rod 4, a handle 5, a pressure rod 6, and a first spring 7; the mounting support 1 is provided with a cam connecting portion 8, a pressure head sleeve seat portion 9, a handle connecting portion 10 and a tiger's mouth portion 11; the cam 2 is provided with a front end portion 21 and a tail portion 22, the front end portion 21 is hinged to the cam connecting portion 8, and the cam 2 can rotate around the hinge point; the inner circle size of the pressure head 3 matches that of the pressure head sleeve seat portion 9, the upper end of the pressure head 3 contacts the cam 2, and the lower end of the pressure head 3 is used to abut against a small plug-in 12; the first spring 7 is assembled between the pressure head 3 and the pressure head sleeve seat portion 9; the adjustable support rod 4 is threadedly connected to the lower end of the tiger's mouth portion 11; the handle 5 is fixed to the handle connecting portion 10; the pressure rod 6 is fixed to the tail portion 22 of the cam 2; and an anti-slip mechanism 20 is also provided.

[0026] The present invention is based on the principle of pure mechanical transmission, abandoning the hydraulic or motor drive structure. The assembly interface is provided by installing the jaws 11 of the support 1. The first spring 7 can realize the automatic reset of the pressure head 3; the adjustable support rod 4 can adjust the height through the nut 14; the handle 5 is used for holding and supporting; the pressure rod 6 is used to apply the pressing torque. A complete force transmission chain of "torque input → cam conversion → pressure head execution → spring reset" is formed, and finally the stable pressing of small parts is realized within the stroke range limited by the adjustable support rod 4 (the small plug-in 12 is installed in the small plug-in seat 13). The jaws 11 are adapted to parts of different sizes; the cam 2 is hinged to the cam connecting part 8, and the torque of the pressure rod 6 is converted into the linear displacement of the pressure head 3 through the cam 2; the adjustable support rod 4 is adjusted in height through the nut 14 to control the pressing stroke; the anti-slip mechanism 20 can prevent the small plug-in 12 from falling out during assembly.

[0027] The press-fitting operation steps are as follows: first, place the small plug-in seat 13 at the upper end of the adjustable support rod 4; second, slide the retaining ring 15 upward by an appropriate distance and stabilize it to leave installation space, place the small plug-in 12 into the lower end of the pressure head 3, loosen the retaining ring 15, and under the action of the first spring, the retaining ring 15 moves downward to cover the small plug-in 12; third, press the pressure rod 6 downward, the cam 2 drives the pressure head 3 to move downward to complete the assembly, the operator releases the hand to stop applying force, and the spring 7 drives the pressure head 3 to automatically return to the initial position, completing a press-fitting cycle.

[0028] The present invention can provide an efficient solution for interference fit assembly in narrow spaces and complex working conditions. The working principle is specifically analyzed as follows: 1. Torque conversion mechanism: The pressure rod 6 is fixed to the tail portion 22 of the cam 2. When the operator presses down on the pressure rod 6, a downward pressure torque is generated; the hinge point of the front end portion 21 of the cam 2 and the cam connecting portion 8 forms a fulcrum, which transmits the torque to the curved surface where the cam 2 contacts the pressure head 3, and further converts it into a downward linear force of the pressure head 3, thereby achieving a lever amplification effect in which a small operating force produces a large pressing force; 2. Pressing execution module: The pressure head 3 is precisely matched with the inner circle of the pressure head sleeve seat 9 to ensure the stability of the axial motion trajectory; the first spring 7 is pre-compressed and assembled between the pressure head 3 and the pressure head sleeve seat 9. When the pressure rod 6 is released, the tension of the first spring 7 drives the pressure head 3 to automatically Reset to the initial position to complete a press cycle; 3. Anti-slip locking function: The anti-slip mechanism 20 can prevent the small plug-in 12 in the assembly from being laterally offset or falling out under pressure; 4. Stroke adjustment system: The adjustable support rod 4 is installed at the lower end of the tiger's mouth 11 through a threaded connection. Rotating the nut 14 can change the height of the adjustable support rod 4, directly controlling the downward stroke H of the pressing head 3 (H=the distance between the top of the adjustable support rod 4 and the initial position of the pressing head 3), and adapting to the assembly requirements of different strokes; 5. Human-computer interaction design: The handle 5 is fixed to the handle connection part 10 to provide a gripping fulcrum for the operator; the spatial layout of the pressing rod 6 and the handle 5 forms a clamp-like structure, which conforms to the one-handed operation habit, ensures that the force direction is aligned with the pressing axis, and avoids tool jamming caused by unbalanced load.

[0029] like Figures 1 to 5 As shown, an improvement is that the anti-slip mechanism 20 includes a retaining ring 15, a second spring 16, an upper positioning clamp 17 and a lower positioning clamp 18. The upper positioning clamp 17 is positioned at the middle of the pressure rod 6 through a slot, and the lower positioning clamp 18 is positioned at the lower end of the pressure rod 6 through a slot. The upper end of the retaining ring 15 is provided with a step 19 matching the lower positioning clamp 18. The retaining ring 15 is movably assembled at the lower end of the pressure rod 6 through the second spring 16, the upper positioning clamp 17 and the lower positioning clamp 18; the inner cavity size of the retaining ring 15 matches the shape of the small plug-in 12, and a floating gap is provided between the retaining ring 15 and the pressure head 3, allowing the retaining ring 15 to float up and down and left and right. During the assembly process, the anti-slip mechanism 20 can effectively prevent the small plug-in 12 from falling out. The retaining ring 15 is movably mounted on the lower end of the pressure head 3, and its inner cavity covers the outer edge of the small plug-in 12, forming a physical limit during the press-fitting process to prevent the small plug-in 12 from lateral displacement or falling out under pressure. The retaining ring 15 can float to adjust the position. Combined with the floating gap design, it can automatically compensate for the dimensional deviation within the part tolerance of ±0.5mm, reduce the risk of assembly misalignment, and achieve a good product rate of 98%, while reducing the skill requirements for operators.

[0030] like Figure 6As shown, the second improvement is that the anti-slip mechanism 20 includes a retaining ring 15, which is threadedly connected to the upper end of the adjustable support rod 4. The retaining ring 15 is sleeved on the upper end of the adjustable support rod 4 (the upper end of the retaining ring 15 is flush with the upper end of the adjustable support rod 4 under normal conditions), and the retaining ring 15 can be rotated to move the retaining ring 15 up to the working position to cover the small plug-in 12, so as to prevent the small plug-in 12 from slipping out during press-fitting.

[0031] like Figure 7 As shown, the third improvement is that the anti-slip mechanism 20 includes a retaining ring 15, which is threadedly connected to the lower end of the pressure head 3. The retaining ring 15 is sleeved on the lower end of the pressure head 3 (the lower end of the retaining ring 15 is flush with the lower end of the pressure head 3 under normal conditions), and the retaining ring 15 can be rotated to move the retaining ring 15 down to the working position to cover the small plug-in 12, thereby preventing the small plug-in 12 from slipping out during press-fitting.

[0032] Another improvement is that the upper end of the adjustable support rod 4 is provided with a groove 23 that matches the shape of the small plug-in seat 13. The groove 23 is used to accurately constrain and position the unlocking seat 13. The adaptable design of the groove 23 at the upper end of the adjustable support rod 4 supports the rapid switching of various small plug-in seats 4, and the replacement can be completed within 60 seconds, which significantly improves the versatility. If a larger-sized small plug-in 12 needs to be assembled, the inner cavity shape and size of the retaining ring 15 can be adjusted to the adaptation requirements, and the groove 23 of the adjustable support rod 4 can be adjusted to the adaptation requirements.

[0033] Another improvement is that the curved surface where the cam 2 contacts the pressure head 3 is an involute curved surface. This structure can ensure a smooth transition between the pressure head moving distance H and the pressure rod pressing angle θ. The involute cam curved surface design allows the stroke error of the pressure head 3 to be controlled within ±0.1mm, and the pressure torque fluctuation can be reduced by 40% compared with ordinary tools, ensuring a smooth and impact-free press-fitting process, which is suitable for high-precision scenarios such as precision electronic components.

[0034] A further improvement is that the handle 5 is provided with an anti-slip angle at the tail end, and the curvature of the anti-slip angle matches the ergonomic grip curve. The angle design at the tail end of the handle 5 conforms to the ergonomic grip curve (in one embodiment, the radius of the angle R=15mm), which can significantly improve the stability and safety of operation and effectively prevent damage to parts caused by tool slippage.

[0035] The present invention is not limited to the specific structures of the above embodiments, and equivalent transformations of other similar structures all fall within the protection scope of the present invention.

Claims

1. A handheld assembly tool for interference fit of small plug-ins and small sockets, characterized in that include: Install a support, a cam, a pressure head, an adjustable support rod, a handle, a pressure rod, and a first spring; the mounting support is provided with a cam connecting portion, a pressure head sleeve seat portion, a handle connecting portion and a tiger's mouth portion; the cam is provided with a front end portion and a tail portion, the front end portion is hinged to the cam connecting portion, and the cam can rotate around the hinge point; the inner circle dimensions of the pressure head and the pressure head sleeve seat portion match, the upper end of the pressure head contacts the cam, and the lower end of the pressure head is used to abut against a small plug-in; the first spring is assembled between the pressure head and the pressure head sleeve seat portion; the adjustable support rod is threadedly connected to the lower end of the tiger's mouth portion; the handle is fixed to the handle connecting portion; the pressure rod is fixed to the tail portion of the cam; and an anti-slip mechanism is also provided.

2. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 1, characterized in that: The anti-slip mechanism includes a retaining ring, a second spring, an upper positioning clamp and a lower positioning clamp. The upper positioning clamp is positioned at the middle of the pressure rod through a clamping groove, and the lower positioning clamp is positioned at the lower end of the pressure rod through a clamping groove. The upper end of the retaining ring is provided with a step hole matching the lower positioning clamp. The retaining ring is movably assembled at the lower end of the pressure rod through the second spring, the upper positioning clamp and the lower positioning clamp; the shape and size of the inner cavity of the retaining ring match the shape and size of the small plug-in, and a floating gap is provided between the retaining ring and the pressure head to allow the retaining ring to float up and down and left and right.

3. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 1, characterized in that: The anti-slip mechanism comprises a retaining ring which is threadedly connected to the upper end of the adjustable support rod.

4. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 1, characterized in that: The anti-slip mechanism comprises a retaining ring which is threadedly connected to the lower end of the pressure head.

5. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 1, 2, 3 or 4, characterized in that: The upper end of the adjustable support rod is provided with a groove matching the shape of the small plug-in seat.

6. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 5, characterized in that: The curved surface where the cam contacts the pressure head is an involute curved surface.

7. A handheld assembly tool for interference fit of a small plug-in unit and a small socket according to claim 6, characterized in that: The rear end of the handle is provided with an anti-slip angle, and the curvature of the anti-slip angle matches the ergonomic grip curve.

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