A multi-directional diagonal screw tightening device

Abstract

This utility model discloses a multi-directional diagonal screw tightening device, specifically relating to the field of mechanical assembly technology. It includes a power box with a built-in motor-driven power gear and a meshing output gear; a set of symmetrically arranged barrels; a power transmission mechanism connecting the output gears and the barrels, comprising a universal joint and an output shaft; and a limiting sleeve to constrain the output shaft to open and close only within a set plane. This utility model, through its symmetrical barrel design, synchronous power transmission, flexible universal joint connection, and crucial planar limiting sleeve, achieves adaptive spacing adjustment within a single plane. This enables it to efficiently, synchronously, and accurately complete the tightening of diagonal screws, making it particularly suitable for applications requiring uniform force on symmetrical fasteners (such as sealing surfaces). Simultaneously, the compact structural design, stable power transmission (dual universal joints), and the magnetic sleeve and handle that enhance operational convenience collectively improve the device's reliability, ease of use, and work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mechanical assembly technology, specifically to a multi-directional diagonal screw tightening device. Background Technology

[0002] In the field of sealing assembly such as engine cylinder blocks and hydraulic valve covers, tightening screws in a diagonal sequence is a core process to ensure uniform pressure distribution on the sealing surface, but traditional assembly methods have technical bottlenecks:

[0003] Technical defects of existing equipment

[0004] Single-axis tightening tool: It requires manual operation of each screw, which is inefficient (actual measurement shows that the assembly time of a single cylinder head with an M10 screw is ≥180 seconds). In addition, manual operation is prone to errors in sequence, which can cause leakage due to uneven pressure on the sealing surface.

[0005] Multi-axis synchronous tightening machine: Although it can tighten multiple screws at the same time, it adopts a rigid parallel structure and the output shaft spacing is fixed, which cannot adapt to the diagonal distance variation of workpieces of different sizes.

[0006] Traditional systems lack adaptability: Industry-standard solutions use hydraulic synchronization systems (such as Bosch Rexroth modules), which are expensive (over $20k per unit) and require an external power source, making them difficult to integrate into lightweight production lines.

[0007] Industry pain points in sealing quality control: Test data on cylinder head seals of internal combustion engines show that when the diagonal screws are tightened at different times, the difference in flange deformation can reach 0.1mm, increasing the risk of seal failure by 300% under high-temperature conditions.

[0008] Therefore, there is an urgent need for a diagonal synchronous tightening device with adaptive spacing, planar constraint transmission, and low-cost integration. Utility Model Content

[0009] The purpose of this invention is to provide a multi-directional diagonal screw tightening device to address the shortcomings of the aforementioned technology.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a multi-directional diagonal screw tightening device, comprising: a power box: a power gear driven by a built-in motor and an output gear meshing with it; a set of symmetrically arranged barrels; a power transmission mechanism: connecting the output gears and the barrels, including: a universal joint and an output shaft; and a limiting sleeve, constraining the output shaft to open and close only within a set plane.

[0011] According to one embodiment of the present invention, the power box includes an upper cover and a lower cover fixedly connected thereto. The motor is fixedly connected to the top of the upper cover. The power gear is fixedly connected to the output end of the motor. Output gears are meshed on both sides of the power gear. The shaft of the output gear passes through the lower cover and is rotatably connected thereto. The output gear is connected to the barrel through a universal joint and an output shaft. A limiting sleeve is provided on the outside of the output shaft.

[0012] According to one embodiment of the present invention, the limiting sleeves on both sides are located in the same plane and can only rotate in the same plane.

[0013] According to one embodiment of the present invention, the power transmission mechanism adopts a double universal joint series structure, with the first universal joint connected to the output gear, the last universal joint connected to the barrel, and the output shaft connected between the two universal joints.

[0014] According to one embodiment of the present invention, the barrel is a magnetic sleeve.

[0015] According to one embodiment of the present invention, the end of the cannon barrel is provided with a handle.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0017] 1. This utility model achieves adaptive spacing adjustment within a single plane through a symmetrical barrel design, synchronous power transmission, flexible universal joint connection, and crucial planar limiting sleeve. This enables it to efficiently, synchronously, and precisely complete the tightening of diagonal screws, making it particularly suitable for applications requiring uniform force on symmetrical fasteners (such as sealing surfaces). Simultaneously, the compact structural design, stable power transmission (dual universal joints), and the magnetic sleeve and handle that enhance operational convenience collectively improve the equipment's reliability, ease of use, and work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the explosion of the power box of this utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the working state of this utility model.

[0023] Components and their numbers shown in the picture:

[0024] 1. Power box; 2. Barrel; 3. Power transmission mechanism; 4. Handle; 101. Power gear; 102. Output gear; 103. Upper cover; 104. Lower cover; 301. Universal joint; 302. Output shaft; 303. Limit sleeve. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model provides, for example Figure 1-3 The multi-directional diagonal screw tightening device shown includes: a power box 1 with a built-in motor-driven power gear 101 and an output gear 102 meshing with it; a set of symmetrically arranged barrels 2; a power transmission mechanism 3 connecting the output gear 102 and the barrels 2, including: a universal joint 301 and an output shaft 302; and a limiting sleeve 303 that restricts the output shaft 302 to open and close only within a set plane. The symmetrically arranged barrels 2 transmit power from the same power box 1 to the two barrels 2 synchronously through the power transmission mechanism 3. The motor drives the power gear 101, which simultaneously meshes with and drives the output gears 102 on both sides, ensuring that the two output shafts 302 receive synchronous rotational power. This allows the two barrels 2 to simultaneously and synchronously tighten two screws located diagonally, significantly improving assembly efficiency and symmetrical tightening quality.

[0027] Specifically, the power box 1 includes an upper cover 103 and a lower cover 104 fixedly connected thereto. The motor is fixedly connected to the top of the upper cover 103. The power gear 101 is fixedly connected to the output end of the motor. Output gears 102 are meshed on both sides of the power gear 101. The shaft of the output gear 102 passes through the lower cover 104 and is rotatably connected thereto. The output gear 102 is connected to the barrel 2 through a universal joint 301 and an output shaft 302. A limiting sleeve 303 is provided on the outside of the output shaft 302. The core of the power transmission mechanism 3 is the universal joint 301. The output shaft 302 and universal joint 301 allow for a certain angular deviation during power transmission. The output shaft 302 is connected to the universal joint 301. The limiting sleeve 303 forces the output shaft 302 (and the entire power transmission mechanism 3 and the barrel 2 connected to it) to open and close only within a set plane. This allows the two barrels 2 to open or close like scissors within a fixed plane. This mechanism enables the device to adapt to diagonal screws with different spacings while strictly limiting the movement trajectory of the barrels 2 to within a plane. This prevents the barrels 2 from swinging unrestrainedly in three-dimensional space, ensuring that they can be precisely aligned with the target screw holes, even if the screw spacing changes or there is a slight positional deviation. During operation, the device only needs to be roughly positioned, and the barrels 2 will automatically adjust into place within the defined plane.

[0028] Specifically, the limiting sleeves 303 on both sides are located in the same plane and can only rotate in the same plane; the limiting sleeves 303 not only constrain the motion plane, but also enhance the structural rigidity of the output shaft 302.

[0029] In this embodiment, the power transmission mechanism 3 adopts a double universal shaft 301 series structure. The first universal shaft 301 is connected to the output gear 102, the last universal shaft 301 is connected to the barrel 2, and the output shaft 302 is connected between the two universal shafts 301. Compared with the single universal shaft 301, the double universal shaft 301 series structure can better transmit power, reduce speed fluctuations, and provide more stable torque output when there is an angle.

[0030] In this embodiment, the barrel 2 is a magnetic sleeve. The end of the barrel 2 is magnetic, which can easily attract the screw, facilitate initial positioning and prevent the screw from falling off, and simplify the operation steps. The end of the barrel 2 is provided with a handle 4, which provides the operator with a clear grip point, making it convenient to apply pressure, adjust the position of the device and stabilize the device, thereby improving the comfort of operation and control accuracy.

[0031] Work process:

[0032] 1. Measure the diagonal screw spacing d of the workpiece (e.g., cylinder block); 2. Adjust the device to the corresponding angle θ. x 3. Positioning device aligns the barrel with the screw; 4. Start the motor to complete the tightening of the first diagonal section; 5. Move the translation device to the next diagonal section and repeat the operation.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-directional diagonal screw tightening device, characterized in that, include: Power box (1): with built-in motor-driven power gear (101) and output gear (102) meshing with it; A set of symmetrically arranged cannon barrels (2); Power transmission mechanism (3): connects the output gear (102) and the barrel (2), including: universal joint (301) and output shaft (302); The limiting sleeve (303) restricts the output shaft (302) to open and close only within the set plane.

2. The multi-directional diagonal screw tightening device according to claim 1, characterized in that: The power box (1) includes an upper cover (103) and a lower cover (104) fixedly connected thereto. The motor is fixedly connected to the top of the upper cover (103). The power gear (101) is fixedly connected to the output end of the motor. Output gears (102) are meshed on both sides of the power gear (101). The shaft of the output gear (102) passes through the lower cover (104) and is rotatably connected thereto. The output gear (102) is connected to the barrel (2) through a universal joint (301) and an output shaft (302). A limiting sleeve (303) is provided on the outside of the output shaft (302).

3. The multi-directional diagonal screw tightening device according to claim 2, characterized in that: The limiting sleeves (303) on both sides are located in the same plane and can only rotate in the same plane.

4. A multi-directional diagonal screw tightening device according to claim 2, characterized in that: The power transmission mechanism (3) adopts a double universal joint (301) series structure. The first universal joint (301) is connected to the output gear (102), the last universal joint (301) is connected to the barrel (2), and the output shaft (302) is connected between the two universal joints (301).

5. A multi-directional diagonal screw tightening device according to any one of claims 1-4, characterized in that: The barrel (2) is a magnetic sleeve.

6. A multi-directional diagonal screw tightening device according to any one of claims 1-4, characterized in that: The barrel (2) is provided with a handle (4) at its end.

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