Thread fatigue testing device

Abstract

The utility model discloses a thread fatigue testing device. The device comprises a fixing frame; testing a nut; a motor; the transmission assembly comprises a coupler, a conduction rod, a wrench nut and a rotating head; the coupler is connected with the motor and used for transmitting power of the motor to the conduction rod and the wrench nut, the wrench nut is fixedly connected with the rotating head, and the rotating head is fixedly connected with the testing nut. The bolt and the test nut are coaxially arranged in the vertical direction; the thread of the bolt is matched with the thread of the test nut; wherein a space is formed in the coupler, at least one part of the conduction rod is arranged in the space, and the coupler is rotationally connected with the conduction rod in a threaded mode; when the motor works, the conduction rod spirally moves relative to the coupler in the space, and power is transmitted to the rotating head and the test nut through the coupler, the conduction rod and the wrench nut, so that the test nut is screwed in or out of a bolt to a specified position in the vertical direction. According to the technical scheme, automation of thread fatigue testing is achieved.

Description

Technical Field

[0001] The present application relates to a thread fatigue testing device. Background Art

[0002] Underwater connectors, also known as submersible connectors, play a vital role in the stable operation of underwater equipment, because the failure of the connector will cause the connected underwater equipment to lose its function, and once the equipment below the seabed fails, it is difficult to repair, the repair cycle is long, and the repair cost is high. Therefore, if the quality stability can be tested before it is put into use, the equipment damage rate can be reduced. At present, there is no corresponding detection method for the fatigue life test of the male joint thread of the submersible connector. If the thread is screwed manually, it will waste manpower and time. Summary of the invention

[0003] In view of this, the technical problem to be solved by the present application is to provide a thread fatigue testing device to solve the problem of quality stability of submersible connectors.

[0004] To solve the above problems, the present application provides a thread fatigue testing device, including: a fixed frame, including a top plate, side plates and a bottom plate; a test nut; a motor, fixedly arranged on the top plate and outputting power to control the rotation of the test nut; a transmission assembly, including a coupling, a conduction rod, a wrench nut and a rotating head; the coupling is connected to the motor, and is used to transmit the motor power to the conduction rod and the wrench nut, the wrench nut is fixedly connected to the rotating head, and the rotating head is fixedly connected to the test nut; a bolt, fixed to the bottom plate, the bolt and the test nut are coaxially arranged in the vertical direction; the thread of the bolt is adapted to the thread of the test nut; wherein a space is provided in the coupling, at least a part of the conduction rod is provided in the space, and the coupling is threadedly connected to the conduction rod; when the motor is working, the conduction rod moves spirally relative to the coupling in the space, and the power is transmitted to the rotating head and the test nut through the coupling, the conduction rod and the wrench nut, so that the test nut is screwed in or out of the bolt to a specified position in the vertical direction.

[0005] The present invention allows the nut used in the connector to be fatigue tested before being put into use to determine whether its quality is qualified and stable. The entire testing process is completed automatically, which greatly improves the work efficiency and the quality stability of the nut. Moreover, it can adapt to the fatigue test of nuts of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The figure is a schematic structural diagram of a thread fatigue testing device provided by an embodiment of the present application;

[0007] Figure 2 for Figure 1 A cross-sectional view of a thread fatigue testing device of the illustrated embodiment;

[0008] Figure 3 It is a schematic structural diagram of a thread fatigue testing device in another embodiment. DETAILED DESCRIPTION

[0009] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0010] Words related to directions in the present application, such as up, down, top, bottom, inside, outside, high, and low, are based on the position of the thread fatigue testing device under normal use conditions as a reference position.

[0011] A thread fatigue testing device comprises: a fixing frame, comprising a top plate, side plates and a bottom plate; a testing nut; a motor, fixedly arranged on the top plate and outputting power for controlling the rotation of the testing nut; a transmission assembly, comprising a coupling, a transmission rod, a wrench nut and a rotating head; the coupling is connected to the motor and is used to transmit the motor power to the transmission rod and the wrench nut, the wrench nut is fixedly connected to the rotating head, and the rotating head is fixedly connected to the testing nut; a bolt, fixed to the bottom plate, the bolt and the testing nut are coaxially arranged in a vertical direction; the thread of the bolt is adapted to the thread of the testing nut; wherein a space is arranged in the coupling, at least a part of the transmission rod is arranged in the space, and the coupling is threadedly connected to the transmission rod; when the motor is working, the transmission rod moves spirally relative to the coupling in the space, and the power is transmitted to the rotating head and the testing nut via the coupling, the transmission rod and the wrench nut, so that the testing nut is screwed in or out of the bolt to a specified position in the vertical direction.

[0012] In at least one embodiment, the thread fatigue testing device also includes a forward and reverse controller, and the rotation direction of the motor is controlled by the forward and reverse controller, so that the motor can achieve periodic forward and reverse switching, thereby achieving the test nut being screwed in and out in the vertical direction relative to the bolt.

[0013] In at least one embodiment, the thread fatigue testing device further includes a timer, and the switching time of the forward and reverse controller is controlled by the timer. Whenever the timer completes a timing cycle, the forward and reverse controller implements a forward and reverse switching.

[0014] In at least one embodiment, the rotary head of the thread fatigue testing device includes multiple sizes for accommodating and fixing test nuts of different sizes.

[0015] In at least one embodiment, the size of the wrench nut of the thread fatigue testing device is adjustable to match rotating heads of different sizes.

[0016] In at least one embodiment, a proximity switch is provided on the side panel of the thread fatigue testing device, and the signal of the proximity switch is connected to the forward and reverse controller. Whenever the rotating head or the wrench nut moves to the position corresponding to the proximity switch, the proximity switch sends a signal to the forward and reverse controller, thereby controlling the motor to stop or change the rotation direction.

[0017] In at least one embodiment, the thread fatigue testing device includes at least two proximity switches, one is set at a vertical height corresponding to the starting point of the test nut stroke, and the other is set at a vertical height corresponding to the end point of the test nut stroke.

[0018] In at least one embodiment, the proximity switch of the thread fatigue testing device includes a pressure sensor or a distance sensor.

[0019] In at least one embodiment, a threaded guide groove is provided on the outer wall of the conduction rod of the threaded fatigue testing device, and a boss is provided in the space of the coupling, and the boss is embedded in the threaded guide groove. When the motor is working, the boss slides along the threaded guide groove, thereby driving the conduction rod to move spirally relative to the coupling.

[0020] The specific implementation process of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 The thread fatigue testing device shown includes a fixing frame, a motor 1 is arranged above the fixing frame, and a transmission assembly, a test nut, a bolt, and a forward and reverse controller 8 are arranged inside the fixing frame; the rotation direction of the motor 1 is controlled by the forward and reverse controller 8, and each time the forward and reverse controller 8 switches a command, the motor 1 switches between forward and reverse, and the forward and reverse controller 8 can perform periodic and repeated command switching, thereby realizing the repeated screwing in and out of the bolt of the test nut in the vertical direction.

[0022] Specifically, the fixing frame includes a top plate 2, a side plate 3 and a bottom plate 10, and the motor 1 is fixedly arranged on the top plate 2; the transmission assembly includes a coupling 4, a conduction rod 5, a wrench nut 6 and a rotating head 7; wherein the coupling 4 is fixedly connected to the motor, and is used to transmit the power of the motor 1 to the conduction rod 5 and the wrench nut 6; the wrench nut 6 is fixedly connected to the rotating head 7, and the rotating head 7 is fixedly connected to the test nut 9, so the power of the motor 1 is finally transmitted to the test nut 9. In order to enable the test device to test test nuts of various specifications, the rotating head includes multiple sizes for adapting to and fixing test nuts of different sizes. Correspondingly, the size of the wrench nut can also be adjusted to match the rotating heads of different sizes.

[0023] like Figure 2 Shown Figure 1In the cross-sectional view of the embodiment shown in the figure, a bolt 13 is arranged on the axis corresponding to the test nut 9, and the bolt 13 is fixed to the base plate 10, and the thread of the bolt is adapted to the thread of the test nut so that the test nut can be screwed in or out of the bolt; further as shown in FIG. Figure 2 As shown, the coupling 4 is a hollow cylinder, the upper end of the transmission rod is arranged in the space inside the hollow cylinder, the outer wall of the transmission rod is provided with a threaded guide groove, and a boss 12 is fixedly arranged on the wall of the coupling, and the boss 12 is embedded in the threaded guide groove on the transmission rod. When the motor 1 is working, the coupling 4 rotates synchronously, and the boss 12 slides along the threaded guide groove on the transmission rod, thereby driving the transmission rod 5 to move spirally relative to the coupling 4, and the power is further transmitted to the rotating head 7 and the test nut 9 through the transmission rod 5 and the wrench nut 6, so that the test nut 9 is screwed in or out of the bolt 13 in the vertical direction to the specified height on the bolt. The specific working process is: turn on the power, the motor 1 rotates clockwise, and the test nut 9 is rotated to the bottom of the thread, the forward and reverse controller 8 is powered off, and the motor 1 stops rotating, and the subsequent forward and reverse controller 8 controls the motor to rotate counterclockwise, and the test nut rotates to the starting position, that is, a thread reciprocating test is completed.

[0024] In one of the embodiments, the command switching time of the forward and reverse controller 8 is controlled by a timer, and each time the timer completes a timing cycle, the forward and reverse controller implements a forward and reverse switch. For example, if the timer is set to reset and reset every 5 seconds, the forward and reverse controller implements a command switch every 5 seconds, and the test nut is reversed after 5 seconds of forward rotation, and then switched to forward rotation after 5 seconds of reverse rotation. The duration of the timer can generally be set as needed, but is usually determined by the standard stroke of the calibration test nut. That is, the calibration test nut is rotated at the speed set by the motor 1, and the time it takes for the calibration test nut to be fully threaded into the bolt is the duration of the timer.

[0025] like Figure 3 Another embodiment of a thread fatigue testing device is shown. Figure 2Compared with the embodiment shown in the figure, the difference is that the forward or reverse stroke of the test nut is controlled by a proximity switch 11 arranged on the side panel, and the proximity switch 11 includes a pressure sensor or a distance sensor. The proximity switch 11 includes two or more, one is arranged at a vertical height corresponding to the starting point of the test nut stroke, and the other is arranged at a vertical height corresponding to the end point of the test nut stroke. The signal of the proximity switch 11 is connected to the forward and reverse controller 8. Whenever the test nut 9 moves to the position of the proximity switch 11, the proximity switch 11 sends a signal to the forward and reverse controller 8, thereby controlling the motor 1 to change the rotation direction or control the motor to stop. The specific working process is as follows: turn on the power, the motor 1 rotates clockwise, and the test nut 9 is rotated to the bottom of the thread. When the rotating head 7 touches the proximity switch 11 at the lower position, the lower position sensor outputs a signal to the forward and reverse controller 8, and the forward and reverse controller 8 controls the motor 1 to start rotating counterclockwise to unscrew the test nut 9 from the bolt. Similarly, when the test nut 9 is unscrewed, the wrench nut 6 touches the upper proximity switch 11, and the proximity switch 11 outputs a signal to the forward and reverse controller 8, and the motor 1 starts to rotate clockwise and screws in the test nut 9, so that the test nut 9 reciprocates. The screwing in and out of the test nut 9 completes a thread reciprocating test. By timing the completion time once, the total time required to complete the thread test can be determined.

[0026] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the present invention is not limited thereby. A person skilled in the art may implement the present invention in a variety of variations without departing from the scope and essence of the present invention, such as using a feature of one embodiment to obtain another embodiment. Any modification, equivalent substitution and improvement made within the technical concept of the present invention shall be within the scope of the present invention.

Claims

1. A thread fatigue testing device, characterized in that include: A fixed frame, including a top plate, side plates and a bottom plate; Test nut; A motor, fixedly mounted on the top plate and outputting power to control the rotation of the test nut; A transmission assembly, comprising a coupling, a transmission rod, a spanner nut and a rotating head; the coupling is connected to the motor and is used to transmit the motor power to the transmission rod and the spanner nut, the spanner nut is fixedly connected to the rotating head, and the rotating head is fixedly connected to the test nut; A bolt is fixed on the bottom plate, wherein the bolt and the test nut are coaxially arranged in a vertical direction; the thread of the bolt is adapted to the thread of the test nut; Among them, a space is provided in the coupling, at least a part of the conduction rod is provided in the space, and the coupling is threadedly connected to the conduction rod; when the motor is working, the coupling drives the conduction rod to move spirally relative to the coupling in the space, and the power is transmitted to the rotating head and the test nut through the coupling, the conduction rod and the wrench nut, so that the test nut is screwed in or out of the bolt to a specified position in the vertical direction.

2. The thread fatigue testing device according to claim 1, characterized in that: It also includes a forward and reverse controller, and the rotation direction of the motor is controlled by the forward and reverse controller, so that the motor can achieve periodic forward and reverse switching, thereby achieving the test nut being screwed in and out in the vertical direction relative to the bolt.

3. The thread fatigue testing device according to claim 2, characterized in that: It also includes a timer, and the switching time of the forward and reverse reversing controller is controlled by the timer. Whenever the timer completes a timing cycle, the forward and reverse reversing controller realizes a forward and reverse reversing switch.

4. The thread fatigue testing device according to claim 1, characterized in that: The rotating head includes multiple sizes and is used to adapt to and fix test nuts of different sizes.

5. The thread fatigue testing device according to claim 1, characterized in that: The spanner nut is adjustable in size and is used to match rotating heads of different sizes.

6. The thread fatigue testing device according to claim 2, characterized in that: A proximity switch is provided on the side panel, and a signal of the proximity switch is connected to the forward and reverse controller. Whenever the rotating head or the wrench nut moves to a position corresponding to the proximity switch, the proximity switch sends a signal to the forward and reverse controller, thereby controlling the motor to stop or change the rotation direction.

7. The thread fatigue testing device according to claim 6, characterized in that: The proximity switches include at least two, one is set at a vertical height corresponding to the starting point of the test nut stroke, and the other is set at a vertical height corresponding to the end point of the test nut stroke.

8. The thread fatigue testing device according to claim 7, characterized in that: The proximity switch includes a pressure sensor or a distance sensor.

9. The thread fatigue testing device according to claim 1, characterized in that: The outer wall of the transfer rod is provided with a threaded guide groove, and a boss is provided in the space of the coupling. The boss is embedded in the threaded guide groove. When the motor is working, the boss slides along the threaded guide groove, thereby driving the transfer rod to move spirally relative to the coupling.

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