Hand-held electronic thread leakage length testing fixture

Abstract

The utility model belongs to the technical field of nut tightening detection devices, and particularly relates to a handheld electronic thread leakage length detection tool which comprises a protective sleeve, a displacement sensor and a probe connected with the displacement sensor. A sliding cavity is formed in the protective sleeve, the displacement sensor is fixedly connected into the sliding cavity, the probe is arranged at the end, extending towards an opening of the sliding cavity, of a telescopic rod of the displacement sensor, and the probe is connected to the end of the telescopic rod. The inner diameter of the sliding cavity is larger than the outer diameter of a to-be-measured stud and smaller than the outer diameter of a locking nut connected to the to-be-measured stud. And one end, far away from the opening of the sliding cavity, of the protective sleeve is provided with a threading hole for a connecting line of the displacement sensor to pass through. The utility model is used for solving the technical problem that a special detection tool for detecting whether an external nut is tightened or not is lacked after the production of a shock absorber is finished at present.

Description

Technical Field

[0001] This utility model belongs to the technical field of nut tightening detection device, specifically relating to a handheld electronic thread protrusion length detector. Background Technology

[0002] There are many reasons for abnormal noise from vibration dampers, among which loose external nuts causing noise are relatively common. Currently, to avoid this issue, the industry usually performs a manual secondary torque check after tightening the nuts. However, this manual check method can be affected by false torque caused by thread quality problems, and there is also the possibility of incomplete tightening. To avoid these problems, the length of the thread protruding after tightening the lock nut can be measured for judgment, but there is a lack of dedicated inspection tools for quick identification.

[0003] Therefore, there is an urgent need to design a gauge to detect the exposed length of the thread after the nut is tightened, so as to ensure the reliability of the external nut connection of the vibration damper and reduce the problem of abnormal noise caused by the nut not being tightened. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a handheld electronic thread protrusion length gauge to solve the technical problem of lacking a dedicated gauge to check whether the external connecting nut is tightened after the shock absorber is produced.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a handheld electronic thread protrusion length gauge, the gauge comprising a protective sleeve, a displacement sensor, and a probe connected to the displacement sensor; a sliding cavity is provided inside the protective sleeve, the displacement sensor is fixedly connected inside the sliding cavity, the probe is disposed at one end of the telescopic rod of the displacement sensor extending towards the opening of the sliding cavity, the probe is connected to the end of the telescopic rod, the inner diameter of the sliding cavity is larger than the outer diameter of the stud to be tested, and smaller than the outer diameter of the locking nut connected to the stud to be tested; a wire hole is provided at the end of the protective sleeve away from the opening of the sliding cavity for the connection wire of the displacement sensor to pass through.

[0006] Preferably, the protective sleeve includes a rear shell and a locking nut detection sleeve detachably connected to the rear shell, and the threading hole is located at the end of the rear shell away from the locking nut detection sleeve.

[0007] Preferably, a limiting part acting on the displacement sensor is provided inside the sliding cavity, and the telescopic rod extends through the limiting part to the opening of the sliding cavity. When no external force is applied, the detection end face of the probe connected to the telescopic rod is flush with the end face at the opening of the sliding cavity.

[0008] Preferably, a displacement sensor mounting base is detachably connected between the rear shell and the locking nut detection sleeve. The displacement sensor mounting base has a stepped hole with open ends. The displacement sensor is fixedly connected in the stepped hole, and the telescopic rod passes through the stepped hole. The stepped hole forms the limiting part.

[0009] Preferably, the displacement sensor mounting base has external threaded portions at both ends in the radial direction, and the rear shell and the locking nut detection sleeve are connected to the external threaded portions.

[0010] Preferably, a compensation part is provided on the outer periphery of the displacement sensor fixing seat between the two external threaded parts, located between the rear shell and the locking nut detection sleeve, to ensure a smooth transition of the outer wall of the protective sleeve.

[0011] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0012] This utility model's protective sleeve is fitted onto the stud to be tested through a sliding cavity, with the end face of the sliding cavity opening abutting against the end face of the locking nut on the stud. The probe abuts against the end of the stud and moves into the sliding cavity under the pushing action of the stud. The telescopic rod connected to the probe retracts, and the displacement sensor detects the distance the probe moves, which is the length of the exposed thread. This gauge has a simple overall structure and a convenient testing method, enabling efficient testing of the connection reliability of the external nut on the shock absorber. Attached Figure Description

[0013] Figure 1 A schematic diagram of an embodiment of a handheld electronic thread protrusion length gauge;

[0014] Figure 2 This is a usage diagram of an embodiment of a handheld electronic thread protrusion length gauge.

[0015] in, Figure 1 , 2 In the middle section, 1-back shell, 11-threading hole, 2-locking nut detection sleeve, 3-displacement sensor mounting base, 31-stepped hole, 32-external thread part, 33-compensation part, 4-sliding cavity, 5-displacement sensor, 6-connection line, 7-probe, 8-stud to be tested, 9-locking nut. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments, and do not limit the scope of the present utility model.

[0017] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The specific implementation method is as follows:

[0020] like Figure 1 , 2 As shown, a handheld electronic thread protrusion length gauge includes a protective sleeve, a displacement sensor 5, and a probe 7. A sliding cavity 4 is coaxially disposed on the protective sleeve, with its left end open. A threading hole 11 communicating with the sliding cavity 4 is provided at the right end of the protective sleeve. More specifically, the inner diameter of the sliding cavity 4 near the opening is larger than the outer diameter of the stud 8 to be tested, but smaller than the outer diameter of the locking nut 9 connected to the stud 8, so that the protective sleeve can be fitted onto the stud 8 through the sliding cavity 4, with its end abutting against the outer end face of the locking nut 9.

[0021] It should be noted that a displacement sensor, also known as a linear sensor, is a type of linear device that uses metal induction. The sensor's function is to convert various measured physical quantities into electrical quantities. In this embodiment, the displacement sensor is selected from the PM11 series as needed. The PM11 series displacement sensor has a telescopic probe at its end, referred to as a telescopic rod in this application.

[0022] The displacement sensor 5 is fixedly connected inside the sliding cavity 4, and the connecting line 6, which is electrically connected to the displacement sensor 5, extends out of the protective sleeve through the wire hole 11. A telescopic rod extends from the end of the displacement sensor 5 near the opening of the sliding cavity 4, and the end of the telescopic rod is connected to the probe 7. In this embodiment, when the probe 7 is in the initial position, its detection end face is flush with the end face of the opening of the sliding cavity 4.

[0023] In this embodiment, the fixture also includes a PLC integrated machine for processing the signals detected by the displacement sensor 5; and a display screen is provided on the protective cover; the PLC is preset with a measurement tolerance range, if the measurement data of the displacement sensor 5 is within the range, OK is displayed on the display screen, if it exceeds the tolerance, NG is displayed on the display screen and an alarm is triggered, and the measurement data can be read directly on the display screen.

[0024] In this embodiment, a handheld electronic thread protrusion length gauge is used. After the locking nut 9 connected to the shock absorber is tightened, the protective sleeve is fitted onto the stud 8 to be tested through the sliding cavity 4, and is continuously fitted so that the end face of the opening of the sliding cavity 4 abuts against the outer end face of the locking nut 9. Under the push of the end of the stud 8 to be tested, the probe 7 slides into the sliding cavity 4, driving the telescopic rod to move into the displacement sensor 5. The displacement sensor 5 detects data and transmits it to the PLC integrated machine. The PLC processes the data and compares it with the pre-set measurement tolerance range. If the measurement data of the displacement sensor 5 is within the range, "OK" is displayed on the screen; if it exceeds the tolerance, "NG" is displayed on the screen and an alarm is triggered. The measurement data can be directly read from the display screen. Based on this, the gauge can quickly identify whether the locking nut 9 is tightened. It has a simple structure, small size, and is easy to operate.

[0025] Furthermore, the protective sleeve includes a rear shell 1 and a locking nut detection sleeve 2. The locking nut detection sleeve 2 is detachably connected to the end of the rear shell 1 and is coaxially arranged. A sliding cavity 4 is provided on the locking nut detection sleeve 2 and the rear shell 1, and a wire hole 11 is provided at the end of the rear shell 1 away from the locking nut detection sleeve 2. The detachable connection facilitates the replacement of the locking nut detection sleeve 2 during maintenance, or facilitates the replacement of locking nut detection sleeves 2 with different inner hole sizes to adapt to the identification of studs with different outer diameters.

[0026] Furthermore, a limiting part is provided inside the sliding cavity 4 to limit the displacement sensor 5. When the limiting part acts on the displacement sensor 5, and when no external force is applied, the detection end face of the probe 7 connected to the telescopic rod is flush with the end face at the opening of the sliding cavity 4 to ensure the accuracy of the probe movement distance detection.

[0027] Furthermore, the protective sleeve also includes a displacement sensor mounting base 3. The displacement sensor mounting base 3 is located between the locking nut detection sleeve 2 and the rear shell 1, and is detachably connected to both. A stepped hole 31, coaxial with the sliding cavity 4, is provided on the displacement sensor mounting base 3. The stepped hole 31 is open at both ends, and the displacement sensor 5 is connected to the stepped hole 31 via a threaded connection. The telescopic rod passes through the stepped hole 31 and extends towards the opening of the sliding cavity 4. The stepped hole 31 forms a limiting part for positioning the displacement sensor 5.

[0028] Furthermore, external threaded portions 32 are provided at both ends of the displacement sensor mounting base 3. The locking nut detection sleeve 2 and the rear shell 1 are respectively connected to the two external threaded portions 32 to achieve a detachable connection. The disassembly structure is simple and the disassembly and assembly are convenient.

[0029] Furthermore, a protruding compensation part 33 is provided on the outer periphery of the displacement sensor mounting base 3 between the two external threaded parts 32. After the displacement sensor mounting base 3 is connected to the nut detection sleeve 2 and the rear shell 1, the protruding compensation part 33 makes the transition between the three parts smooth, making the outer surface of the protective cover smooth overall and improving the user's grip experience.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A handheld electronic thread protrusion length gauge, characterized in that, The fixture includes a protective sleeve, a displacement sensor, and a probe connected to the displacement sensor. A sliding cavity is provided inside the protective sleeve, and the displacement sensor is fixedly connected inside the sliding cavity. The probe is located at the end of the telescopic rod of the displacement sensor that extends towards the opening of the sliding cavity, and is connected to the end of the telescopic rod. The inner diameter of the sliding cavity is larger than the outer diameter of the stud to be tested, but smaller than the outer diameter of the locking nut connected to the stud to be tested. A wire hole is provided at the end of the protective sleeve away from the opening of the sliding cavity for the connection wire of the displacement sensor to pass through.

2. A hand-held electronic thread-out length gauge according to claim 1, wherein, The protective sleeve includes a rear shell and a locking nut detection sleeve detachably connected to the rear shell, and the wire hole is located at the end of the rear shell away from the locking nut detection sleeve.

3. A hand-held electronic thread-out length gauge according to claim 2, wherein, The sliding cavity is provided with a limiting part that acts on the displacement sensor. The telescopic rod passes through the limiting part and extends to the opening of the sliding cavity. When there is no external force, the detection end face of the probe connected to the telescopic rod is flush with the end face of the opening of the sliding cavity.

4. A hand-held electronic thread-out length gauge according to claim 3, wherein, A displacement sensor mounting base is detachably connected between the rear shell and the locking nut detection sleeve. The displacement sensor mounting base has a stepped hole with open ends. The displacement sensor is fixedly connected in the stepped hole, and the telescopic rod passes through the stepped hole. The stepped hole forms the limiting part.

5. A hand-held electronic thread-out length gauge according to claim 4, wherein, The displacement sensor mounting base has external threaded portions at both ends in the radial direction, and the rear shell and the locking nut detection sleeve are connected to the external threaded portions.

6. A hand-held electronic thread-out length gauge according to claim 5, wherein, A compensation part is provided on the outer periphery of the displacement sensor mounting base between the two external threads, located between the rear shell and the locking nut detection sleeve, to ensure a smooth transition of the outer wall of the protective sleeve.

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