CN111337338A - Fatigue test device for repeatedly winding and unwinding optical cable - Google Patents

Abstract

The invention provides a fatigue test device for repeatedly winding and unwinding a wound optical cable, which comprises: a drive mechanism including a drive wheel driven to rotate by the first rotary drive device; the loading mechanism comprises a test wheel connected with the linear driving device, and the linear driving device drives the test wheel to move and applies a loading force; the wrap angle mechanism is arranged between the driving mechanism and the loading mechanism and comprises a guide wheel which is arranged on the support in a height-adjustable mode, and the height of the guide wheel is not less than that of the driving wheel and/or the test wheel; the control system is electrically connected with the first rotary driving device and the linear driving device; the driving mechanism, the wrap angle mechanism and the loading mechanism are sequentially arranged on the rack. The invention has the advantages that the repeated winding and unwinding process of the optical cable wound on the winding drum under the action of actual working tension can be efficiently, conveniently and conveniently simulated, the state of the optical cable after the test can be observed, and the fatigue resistance of the optical cable can be comprehensively evaluated.

Description

Fatigue test device for repeated unwinding and unwinding of wound optical cables

technical field

The invention relates to a wire and cable detection device, in particular to a fatigue test device used for repeatedly retracting and unwinding a wound optical cable.

Background technique

For many types of optical cables, the application and working environment is relatively special and harsh. They are mainly installed and wound on the reel of the winch. With the rotation of the reel, it bears a certain tension and performs repeated winding movements. . After working for a long time, the optical cable may be fatigued, and then there will be problems such as structural change and performance degradation, which will cause damage to the system engineering. To this end, it is necessary to design a device that can efficiently, accurately and conveniently perform fatigue tests on optical cables, meet various test requirements, and ensure an intuitive and timely understanding of the performance changes of optical cables.

SUMMARY OF THE INVENTION

In view of the above defects, the purpose of the present invention is to provide a fatigue test device for repeatedly retracting and unwinding the wound optical cable.

The invention provides a fatigue test device for repeatedly retracting and unwinding a wound optical cable, comprising: a driving mechanism, including a driving wheel driven to rotate by a first rotary driving device; a loading mechanism, including a test device connected with a linear driving device The linear driving device drives the test wheel to move and applies a loading force; the wrap angle mechanism is arranged between the driving mechanism and the loading mechanism, and includes a guide wheel that is adjustable in height on the support, so The height of the guide wheel is not less than the height of the driving wheel and/or the test wheel; the control system is electrically connected with the first rotary driving device and the linear driving device; the driving mechanism, the wrap angle mechanism and the loading mechanism are sequentially Mounted on the rack.

Preferably, the linear drive device is a ball screw.

Preferably, the screw of the ball screw is connected with the second rotary drive device through gear transmission, and the movable nut of the ball screw is connected with the test wheel.

Preferably, one end of the screw rod is fixedly connected to the frame through a fixing bracket.

Preferably, a moving beam is fixedly connected to the movable nut, the test wheel is fixedly connected to the loading beam through a connecting bracket, and the moving beam and the loading beam are connected by a connecting rod.

Preferably, guide rails are provided on both sides of the frame, and the moving beam and the loading beam are respectively slidably connected to the guide rails.

Preferably, the inner side of the frame is further provided with a sliding rail matched with the test wheel.

Preferably, a limit switch and a counter are also installed on the drive wheel.

Preferably, the angle wrapping mechanism further includes an installation shaft, a plurality of installation positions are provided on the installation shaft along the left-right direction, and the guide wheel is detachably connected to the installation positions.

Preferably, the support is provided with a plurality of fixing positions along the up-down direction, and the mounting shaft is detachably connected to the fixing positions.

The benefits of the present invention are:

First, in order to simulate the repeated retracting and unwinding process of the optical cable wound on the reel under the action of the actual working tension, a certain number of repeated retracting and unwinding tests are carried out under the simulated actual working conditions, which is helpful to observe the optical cable after the test. The displayed state comprehensively evaluates the fatigue resistance of the optical cable;

Second, it can be equipped with a variety of test wheels, which can be replaced quickly and easily, and can meet the test requirements of optical cables with various outer diameters;

Third, the testing machine can provide a maximum loading force of 200kN, which can meet the test tensile force requirements of most of the optical cables in the working environment of repeated winding and unwinding.

Fourth, the equipment can also perform various mechanical tests such as tensile test, pulley test, and flattening test;

Fifth, the test line speed of the equipment is adjustable, and the maximum line speed can achieve fast and efficient test requirements;

Sixth, the device can realize real-time performance monitoring of the performance of the optical cable, and intuitively and timely understand the performance changes of the optical cable.

Description of drawings

Fig. 1 is the front view of the fatigue test apparatus of the present invention;

Fig. 2 is the top view of the fatigue test apparatus of the present invention;

Fig. 3 is the schematic diagram at A-A place in Fig. 2;

Fig. 4 is the perspective view of the fatigue test apparatus of the present invention;

FIG. 5 is a schematic diagram of the working state of the fatigue test device of the present invention.

Component label description:

1 drive wheel

11 The first rotary drive

2 guide wheels

21 stand

22 fixed positions

23 Mounting the shaft

24 Connection block

25 mounting positions

3 test wheels

31 Rope groove

32 Attachment bracket

33 Rails

4 screws

41 Active Nut

42 Fixing bracket

43 Second rotary drive

44 drive wheel

45 driven wheel

51 Moving beam

52 Loading beam

53 Rails

54 connecting rod

6 racks

61 Support legs

Detailed ways

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Also, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

Fig. 1 is a front view of the fatigue test device of the present invention. In the following description, the drawing in Fig. 1 is used as a reference basis for the direction, and the upward direction along the drawing paper is the upward direction, and the downward direction along the drawing paper surface is the downward direction , along the view paper to the right is the rear direction, along the view paper to the left is the front direction, perpendicular to the paper surface outward is the left direction, perpendicular to the paper surface inward is the right direction.

As shown in Figures 1 and 2, the present invention provides a fatigue test device for repeatedly retracting and unwinding a wound optical cable. The device includes a driving mechanism, a loading mechanism, a wrap angle mechanism and a control system. The drive mechanism, wrap angle The mechanism and the loading mechanism are sequentially installed on the frame 6 from front to back, and the bottom of the frame 6 is provided with a plurality of supporting legs 61 . The driving mechanism includes a driving wheel 1 that is driven to rotate by a first rotary driving device 11. The first rotary driving device 11 is specifically a servo motor reduction unit, which is connected to the driving wheel 1 through a coupling, and is controlled by the control system. Next, the driving wheel 1 is controlled to rotate repeatedly at a certain frequency. A limit switch and a counter are also installed on the drive wheel 1 to collect the breakage signal of the optical cable and record the number of tests.

As shown in FIG. 2 and FIG. 4 , the loading mechanism includes a test wheel 3 connected with a linear drive device, and the linear drive device drives the test wheel 3 to move backward, thereby applying a loading force to the test wheel 3 . In the specific implementation, the linear drive device is a ball screw, and the ball screw has the characteristics of stable operation and high repeatability of reciprocating motion. Among them, the screw 4 of the ball screw is connected with the second rotary drive device 43 through gear transmission, the second rotary drive device 43 is a servo motor reduction unit installed under the ball screw, and the output end is fixedly connected with the driving wheel 44, the screw 4 The rear end of the screw 4 is fixedly connected with a driven wheel 45, the driving wheel 44 and the driven wheel 45 are connected by transmission, and the front end of the screw 4 is fixedly connected with the frame 6 through the fixed bracket 42, so that the installation of the ball screw is stable and firm. The movable nut 41 of the ball screw is sleeved on the screw 4 and connected with the test wheel 3. When the second rotary drive device 43 drives the screw 4 to rotate and the movable nut 41 moves linearly, the movable nut 41 is opposite to the test wheel 3. A backward loading force was applied for the purpose of the test. Specifically, a movable beam 51 is fixedly connected to the movable nut 41, the test wheel 3 is fixedly connected to the loading beam 52 through the connecting bracket 32, and both ends of the movable beam 51 and the loading beam 52 are in contact with the upper surface of the frame 6, respectively. They are connected by two connecting rods 54 . In order to further ensure that the loading force is always on the same axis, guide rails 53 are provided on both sides of the upper surface of the frame 6 , and the moving beam 51 and the loading beam 52 are slidably connected to the guide rails 53 respectively. In addition, the inner side of the frame 6 is also provided with a sliding rail 33 matched with the test wheel 3 to ensure that the moving beam 51 and the loading beam 52 drive the test wheel 3 to move in the same direction. The control system is electrically connected with the second rotary drive device 43, and through automatic adjustment, the loading force is kept constant, and the maximum loading force is 200kN. In addition, constant displacement control and constant force control can be realized by using computer displacement closed-loop and force closed-loop control. The number of rope grooves 31 on the test wheel 3 can be adjusted as required.

As shown in Figure 1, Figure 3 and Figure 4, the wrap angle mechanism is arranged between the drive mechanism and the loading mechanism, including a guide wheel 2 that is adjustable in height on the support 21, so as to satisfy the test optical cable with a certain wrap angle The need to conduct experiments. Specifically, the wrap angle mechanism includes an installation shaft 23 with connecting blocks 24 at both ends. The installation shaft 23 is provided with a plurality of installation positions 25 along the left and right directions, and the guide wheel 2 is detachably connected to the installation positions 25 . The support 21 is provided with a plurality of fixing positions 22 along the up-down direction, and the specific distance between two adjacent fixing positions 22 is 200mm. That is, by setting a plurality of installation positions 25 and fixing positions 22, the requirements of different installation positions of the guide wheel 2 in the up, down, left, and right directions are satisfied, and it is convenient to replace the guide wheel 2 with different wheel diameters.

As shown in Figure 5, the fatigue test device of the present invention is based on the completion of a single-stage fatigue test, and the working method is as follows:

Test mode A: only wind the optical cable 7 on the driving wheel 1 and the test wheel 3, the driving wheel 1 and the test wheel 3 are located at the same height, control the driving wheel 1 to rotate forward and reverse at a certain frequency, and control the linear drive device to the test wheel. 3. Apply a certain loading force to complete the fatigue test of the optical cable 7;

Test mode B: The optical cable 7 is wound around the driving wheel 1 and the test wheel 3. The optical cable 7 passes the guide wheel 2 on the way, and the height of the guide wheel 2 is set to be greater than the height of the driving wheel 1 and/or the test wheel 3. The driving wheel 1 and the test wheel 3 are located at the same height, so the optical cable 7 has a certain wrap angle. At this time, the driving wheel 1 is controlled to rotate forward and reverse at a certain frequency, and the linear drive device is controlled to apply a certain loading force to the test wheel 3, and the Fatigue test of angled optical cable 7.

The driving wheel 1 and the test wheel 3 used for the test are treated with material QT600 modulated HB260-280, and the surface roughness of the rope groove 31 is 1.6-3.2.

To sum up, the benefits of the present invention are:

First, in order to simulate the repeated retracting and unwinding process of the optical cable wound on the reel under the action of the actual working tension, a certain number of repeated retracting and unwinding tests are carried out under the simulated actual working conditions, which is helpful to observe the optical cable after the test. The displayed state comprehensively evaluates the fatigue resistance of the optical cable;

Second, it can be equipped with a variety of test wheels, which can be replaced quickly and easily, and can meet the test requirements of optical cables with various outer diameters;

Third, the testing machine can provide a maximum loading force of 200kN, which can meet the test tensile force requirements of most of the optical cables in the working environment of repeated winding and unwinding.

Fourth, the equipment can also perform various mechanical tests such as tensile test, pulley test, and flattening test;

Fifth, the test line speed of the equipment is adjustable, and the maximum line speed can achieve fast and efficient test requirements;

Sixth, the device can realize real-time performance monitoring of the performance of the optical cable, and intuitively and timely understand the performance changes of the optical cable.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A fatigue test device for repeatedly winding and unwinding a wound optical cable, comprising:

a drive mechanism including a drive wheel (1) driven to rotate by a first rotary drive device (11);

the loading mechanism comprises a test wheel (3) connected with a linear driving device, and the linear driving device drives the test wheel (3) to move and applies a loading force;

the wrap angle mechanism is arranged between the driving mechanism and the loading mechanism and comprises a guide wheel (2) which is mounted on a support (21) in a height-adjustable mode, and the height of the guide wheel (2) is not less than that of the driving wheel (1) and/or the test wheel (3);

the control system is electrically connected with the first rotary driving device (11) and the linear driving device;

the driving mechanism, the wrap angle mechanism and the loading mechanism are sequentially arranged on the rack (6).

2. A fatigue testing device according to claim 1, wherein said linear driving means is a ball screw.

3. A fatigue testing device according to claim 2, wherein the screw (4) of the ball screw is in gear transmission connection with the second rotary drive (43), and the movable nut (41) of the ball screw is in connection with the test wheel (3).

4. A fatigue testing device according to claim 3, wherein one end of the screw (4) is fixedly connected with the frame (6) by a fixing bracket (42).

5. A fatigue testing device according to claim 3, wherein a movable beam (51) is fixedly connected to the movable nut (41), the testing wheel (3) is fixedly connected with a loading beam (52) through a connecting bracket (32), and the movable beam (51) and the loading beam (52) are connected through a connecting rod (54).

6. A fatigue testing device according to claim 5, wherein guide rails (53) are provided on both sides of the frame (6), and the moving beam (51) and the loading beam (52) are slidably connected to the guide rails (53), respectively.

7. A fatigue testing device according to claim 3, wherein a slide rail (33) matched with the testing wheel (3) is arranged inside the frame (6).

8. A fatigue testing device according to claim 1, wherein a limit switch and a counter are further mounted on the driving wheel (1).

9. The fatigue testing device according to claim 1, wherein the wrap angle mechanism further comprises a mounting shaft (23), a plurality of mounting positions (25) are provided on the mounting shaft (23) in the left-right direction, and the guide wheel (2) is detachably connected in the mounting positions (25).

10. A fatigue testing device according to claim 9, wherein a plurality of fixing positions (22) are arranged on the support (21) along the up-down direction, and the mounting shaft (23) is detachably connected in the fixing positions (22).

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