Nut locking detection device

Abstract

The utility model discloses a nut locking detection device, its setting is on the nut locking station and nut detection station of piston rod tightening machine's mounting bracket, is used for executing the locking and detection operation of nut, the nut locking detection device includes the nut locking assembly for executing locking operation and the nut detection assembly for executing detection operation. The utility model has the beneficial effects that: this technical scheme is through the structure optimization and function integration, and effectively solved the problem of nut locking inaccuracy, low detection efficiency and easy damage of equipment in the prior art, has the remarkable practical value and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of automated production equipment technology, and in particular to a nut tightening detection device. Background Technology

[0002] In the field of mechanical assembly, nuts, as key fasteners connecting components, directly affect the reliability and safety of equipment operation due to their tightening state. Traditional nut tightening and inspection operations suffer from the following technical bottlenecks: First, in the nut tightening stage, existing technologies mostly employ manual wrenches, ordinary electric screwdrivers, or early servo tightening equipment. Manual operation relies on worker experience, making it difficult to accurately control the tightening torque, easily leading to overtightening causing thread stripping or undertightening causing nut loosening. While early servo equipment has some torque control capabilities, it lacks an effective buffer structure. When the tightening head contacts the nut due to assembly errors or uneven surfaces, it easily generates axial impact loads, causing torque sensor overload damage or tightening head wear, resulting in high equipment maintenance costs and short service life. Second, in the nut tightness inspection stage, traditional methods mainly rely on manual visual inspection or simple torque re-inspection: Manual visual inspection can only observe the surface condition of the nut and cannot determine whether the internal connection is loose, resulting in a high rate of missed detections; torque re-inspection requires rotating the nut again, which may disrupt the tightened state, and the inspection efficiency is low (approximately 30 seconds per nut), making it difficult to meet the continuous operation requirements of automated production lines. While some automated inspection equipment uses grippers for inspection, insufficient precision in the drive system (such as using a common motor with gear transmission) can easily cause secondary damage to the nuts due to improper speed or angle control during inspection. Furthermore, it is incompatible with nuts of different specifications, limiting its applicability. In addition, existing locking and inspection equipment are mostly independent devices, requiring separate installations at different workstations. This not only occupies significant production line space but also necessitates additional workpiece transfer time (approximately 15 seconds per piece), resulting in low overall production efficiency (approximately 60 pieces per hour per workstation). This fails to meet the modern manufacturing industry's demands for "high precision, high efficiency, and high integration."

[0003] Therefore, it is necessary to develop a nut tightening detection device. After searching, no technical solution identical to this utility model was found. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a nut tightening detection device, thereby solving one or more of the above-mentioned prior art problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a nut tightening detection device, which is installed on the nut tightening station and nut detection station on the mounting frame of the piston rod tightening machine, for performing nut tightening and detection operations; its innovation lies in that: the nut tightening detection device includes a nut tightening component for performing the tightening operation and a nut detection component for performing the detection operation.

[0006] In some embodiments, the nut tightening assembly includes a seventh servo motor, a seventh reducer disposed at the output end of the seventh servo motor, a seventh torque sensor mounted at the output end of the seventh reducer, and a seventh nut tightening head mounted at the output end of the seventh torque sensor.

[0007] In some embodiments, the nut detection assembly includes an eighth loosening detection servo motor, an eighth reducer disposed at the output end of the eighth loosening detection servo motor, and an eighth tension detection head disposed at the output end of the eighth reducer.

[0008] In some embodiments, the nut locking assembly further includes a seventh vertical floating assembly disposed between the seventh torque sensor and the seventh nut tightening head.

[0009] In some embodiments, the seventh vertical floating component includes a seventh fixed seat and a seventh floating seat arranged coaxially. The seventh fixed seat is provided with a seventh spring groove, and a seventh spring is provided in the seventh spring groove. One end of the seventh spring is fixed to the bottom of the seventh spring groove, and the other end is fixedly connected to the top of the seventh floating seat.

[0010] In some embodiments, the eighth tension detection head includes an eighth base and an eighth detection gripper mounted on the eighth base.

[0011] The beneficial effects of this utility model are: through structural optimization and functional integration, this technical solution effectively solves the problems of inaccurate nut tightening, low detection efficiency and easy equipment damage in the prior art, and has significant practical value and economic benefits. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0013] Figure 1 This is a schematic diagram of the structure of a nut tightening detection device according to the present invention.

[0014] Figure 2This is a front view of a nut tightening detection device according to this utility model. Detailed Implementation

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] like Figure 1 and Figure 2 As shown, this utility model embodiment includes: a nut tightening detection device, applied to the mounting bracket of a piston rod tightening machine, which integrates a nut tightening component and a nut detection component to achieve precise tightening and loosening detection of the nut; the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0017] In this embodiment, the nut tightening detection device includes a nut tightening assembly and a nut detection assembly, which are respectively set at the nut tightening station and the nut detection station of the piston rod tightening machine. They can move along the workpiece conveying direction with the mounting frame to realize continuous tightening-detection operation on the same workpiece.

[0018] The nut tightening assembly includes a seventh servo motor 510, a seventh reducer 511, a seventh torque sensor 512, a seventh nut tightening head, and a seventh up-and-down floating assembly. The seventh servo motor 510 is fixed to a mounting bracket, and its output end is connected to the seventh reducer 511 (a planetary reducer with a reduction ratio of 1:10), used to convert the motor's high speed to low speed, high torque output. The output end of the seventh reducer 511 is assembled with the seventh torque sensor 512 (a strain gauge torque sensor with a range of 0-500 N·m). The sensor is connected to an external controller (such as a PLC) via a signal cable, which can collect the torque value during the tightening process in real time and feed it back to the controller. The seventh nut tightening head (made of...) A 42CrMo high-strength alloy (with a hexagonal groove at the head to match the nut) is mounted on the output end of the seventh torque sensor 512 for direct contact and rotation of the nut. A seventh floating assembly is located between the seventh torque sensor 512 and the seventh nut tightening head, including a seventh fixed seat 531 and a seventh floating seat 532 coaxially arranged. The seventh fixed seat 531 (fixedly connected to the output end of the seventh torque sensor 512) has a seventh spring groove at its top, and a seventh spring 533 (a high-elasticity cylindrical helical spring with a compression of 10mm) is installed in the groove. The bottom of the seventh floating seat 532 (fixedly connected to the top of the seventh nut tightening head) is fixed to the top of the seventh spring 533.

[0019] When the seventh servo motor 510 starts, the power is transmitted sequentially through the seventh reducer 511 and the seventh torque sensor 512 to the seventh nut tightening head, driving the nut to rotate and lock. During this process, if the nut generates an axial impact force when the tightening head contacts it due to positional deviation or uneven surface, the seventh floating seat 532 will compress the seventh spring 533. The impact energy is absorbed by the elastic deformation of the spring, avoiding overload of the torque sensor or wear of the tightening head caused by hard contact. At the same time, the seventh torque sensor 512 monitors the torque value in real time. When the set locking torque (such as 300 N·m) is reached, the controller controls the seventh servo motor 510 to stop, ensuring that the locking force is accurate and controllable.

[0020] This design not only extends the service life of key components but also improves the consistency of locking operations.

[0021] The nut detection assembly includes an eighth loosening detection servo motor 520, an eighth reducer 521, and an eighth tightness detection head. Specifically: the eighth loosening detection servo motor 520 is fixed to a mounting bracket, and its output end is connected to the eighth reducer 521 (a harmonic reducer with a reduction ratio of 1:15) to provide stable low-speed rotational power; the output end of the eighth reducer 521 is assembled with the eighth tightness detection head, which includes an eighth base 541 (fixed to the output end of the eighth reducer 521) and an eighth detection gripper 542 (an adjustable pneumatic gripper with a clamping force range of 50-200N) mounted on the base.

[0022] When the workpiece is locked and moved to the inspection station, the eighth loosening inspection servo motor 520 starts, driving the eighth loosening inspection head to rotate via the eighth reducer 521. The eighth inspection gripper 542 first clamps the nut (the clamping force is adjusted to 150N according to the nut specification), and then the servo motor rotates slightly in the forward or reverse direction at a set speed (e.g., 5rpm) (rotation angle ≤5°). If the nut is not loose, there is no relative slippage between the inspection gripper and the nut, and the motor torque is stable. If the nut is loose, the gripper will drive the nut to rotate, at which point the motor torque drops sharply, and the controller detects the abnormality and triggers an alarm (e.g., audible and visual alarm). This design, through a low-speed, small-angle inspection method, avoids secondary damage to the locked nut and can accurately identify the loose state, improving the inspection efficiency by more than 80% compared to traditional manual visual inspection.

[0023] The working principle of this technical solution is as follows: When the workpiece moves to the nut locking station along the conveyor line, the seventh servo motor 510 of the nut locking assembly starts, and drives the seventh nut tightening head to rotate through the seventh reducer 511 and the seventh torque sensor 512 to tighten the nut to the target torque (e.g., 300 N·m). During the process, the seventh up-and-down floating assembly is buffered by springs to avoid impact. After the locking is completed, the workpiece moves to the nut detection station, and the eighth loosening detection servo motor 520 of the nut detection assembly drives the eighth loosening detection head to rotate. The eighth detection gripper 542 clamps the nut and rotates it slightly to detect its tightness. If there is an abnormality, an alarm will be triggered.

[0024] The advantages of this technical solution are:

[0025] Integrated design: The locking and detection functions are integrated into the same device, which reduces the space occupied by the equipment and can complete the "locking-detection" closed-loop operation in the same process, increasing production efficiency by 40%.

[0026] High-precision control: Through the cooperation of servo motor, reducer and torque sensor, precise control of locking torque (error ≤ ±2%) and reliable detection of tightness (false detection rate < 0.5%) are achieved;

[0027] High durability: The spring buffer design of the seventh floating component effectively reduces the wear of key components, extending the equipment maintenance cycle to 6 months (compared to 3 months for traditional equipment);

[0028] High compatibility: By replacing the seventh nut tightening head and the eighth detection clamp 542 with different specifications, it can be adapted to a variety of nuts in the range of M8-M20, and is applicable to a wide range of scenarios.

[0029] In summary, this utility model effectively solves the problems of inaccurate nut tightening, low detection efficiency, and easy equipment damage in the prior art through structural optimization and functional integration, and has significant practical value and economic benefits.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A nut tightening detection device, which is installed on the mounting frame of a piston rod tightening machine at a nut tightening station and a nut detection station, for performing nut tightening and detection operations; characterized in that: The nut tightening detection device includes a nut tightening assembly for performing a tightening operation and a nut detection assembly for performing a detection operation; the nut tightening assembly includes a seventh servo motor (510), a seventh reducer (511) disposed at the output end of the seventh servo motor (510), a seventh torque sensor (512) mounted at the output end of the seventh reducer (511), and a seventh nut tightening head mounted at the output end of the seventh torque sensor (512); the nut detection assembly includes an eighth loosening detection servo motor (520), an eighth reducer (521) disposed at the output end of the eighth loosening detection servo motor (520), and an eighth loosening detection head disposed at the output end of the eighth reducer (521); the nut tightening assembly also includes a seventh up-and-down floating assembly, which is disposed between the seventh torque sensor (512) and the seventh nut tightening head.

2. The nut tightening detection device according to claim 1, characterized in that: The seventh floating assembly includes a seventh fixed seat (531) and a seventh floating seat (532) arranged coaxially. The seventh fixed seat (531) is provided with a seventh spring groove, and a seventh spring (533) is provided in the seventh spring groove. One end of the seventh spring (533) is fixed to the bottom of the seventh spring groove, and the other end is fixedly connected to the top of the seventh floating seat (532).

3. The nut tightening detection device according to claim 1, characterized in that: The eighth tension detection head includes an eighth base (541) and an eighth detection gripper (542) mounted on the eighth base (541).

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