Optical cable friction coefficient testing device

Abstract

The invention belongs to the technical field of friction coefficient testing, and particularly relates to an optical cable friction coefficient testing device which comprises a base, a lifting mechanism is arranged on the base, the output end of the lifting mechanism is fixedly connected with a supporting seat, and a supporting frame and a lower clamping seat are fixedly arranged on the supporting seat. Four lead screws are rotatably arranged between the supporting frame and the supporting seat, an upper clamping seat matched with the lower clamping seat is in threaded connection among the four lead screws, and a plurality of rows of simulation optical cable sections are fixedly adhered to the opposite surfaces of the upper clamping seat and the lower clamping seat. Under the control of the joint control mechanism, the upper clamping base can be controlled to move up and down so that the distance between the upper clamping base and the lower clamping base can be adjusted and controlled according to needs, meanwhile, through the cooperation of the arranged pressure applying mechanism, the pressure sensor and the PLC, automatic and accurate pressure control can be achieved, and the complexity and uncertainty of manual pressure control are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of friction coefficient testing, and in particular relates to an optical cable friction coefficient testing device. Background Art

[0002] The dynamic friction coefficient of optical cables plays a vital role in the evaluation of optical cable performance and is one of the key technical indicators for testing the low friction characteristics of optical cables. The lower the dynamic friction coefficient of optical cables, the easier it is to thread the cables through pipes in practical applications. In order to accurately test whether the friction coefficient of optical cables meets the requirements of relevant standards, the friction coefficient of optical cables is usually tested professionally with the help of a friction coefficient testing device. For example, an optical cable dynamic friction coefficient testing device shown in an existing public patent (application number CN201510682700.8) is a typical representative of the field of optical cable friction coefficient testing.

[0003] However, the friction test equipment has some obvious shortcomings in the actual process of testing optical cables. Specifically, in the operation of clamping and fixing the optical cable by the upper and lower steel plates, a fixed-length support rod is used to control the clamping distance. This design method will bring many inconveniences when testing optical cables of different thicknesses. Since the length of the support rod is fixed, it cannot flexibly adapt to optical cables of different diameters. Therefore, it is often necessary to frequently replace support rods of different lengths to achieve the regulation of the clamping distance. This process is not only cumbersome to operate, but also consumes a lot of time and labor costs. In addition, in terms of controlling the positive pressure of the optical cable test, the equipment mainly relies on manually selecting weights of corresponding weights and placing them on the upper steel plate. This method of manually controlling the application of positive pressure makes the entire test operation process extremely cumbersome. Operators need to carefully select weights of appropriate weights according to different test requirements. This not only increases the complexity of the operation, but is also prone to human errors. At the same time, this manual operation method also greatly affects the test efficiency and cannot meet the needs of efficient and fast testing.

[0004] Therefore, we propose an optical cable friction coefficient testing device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a device for testing the friction coefficient of an optical cable in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a fiber optic cable friction coefficient testing device, comprising a base, a lifting mechanism is arranged on the base, and the output end of the lifting mechanism is fixedly connected to a support seat, a support frame and a lower clamping seat are fixedly arranged on the support seat, four lead screws are rotatably arranged between the support frame and the support seat, and an upper clamping seat matched with the lower clamping seat is threadedly connected between the four lead screws, multiple rows of simulated optical cable segments are fixedly bonded to the opposite sides of the upper clamping seat and the lower clamping seat, a linkage control mechanism matched with the four lead screws is arranged on the support seat, a pressure mechanism is arranged on the support frame, and the output end of the pressure mechanism is fixedly connected to a pressure plate matched with the upper clamping seat, a plurality of pressure sensors are fixedly installed on the lower side of the pressure plate, a fixed pulley is rotatably arranged on the support seat, a PLC controller is fixedly arranged on the support frame, and the PLC controller is used to control the start and close procedures of each electrical equipment.

[0007] In the above-mentioned optical cable friction coefficient testing device, the lifting mechanism includes two hydraulic cylinders, and the two hydraulic cylinders are fixedly arranged on the base, and the output ends of the two hydraulic cylinders are fixedly connected to the support seat.

[0008] In the above-mentioned optical cable friction coefficient testing device, the joint control mechanism includes a pulley assembly, a gear set and a knob, a control cavity is opened on the support seat, and the lower ends of four lead screws extend into the control cavity and are connected through the pulley assembly, the knob is rotatably arranged on the support seat, and the lower end of the transmission shaft of the knob extends into the control cavity and is connected to one of the lead screws through the gear set, and the thread lead angle of the lead screw is smaller than the equivalent friction angle.

[0009] In the above-mentioned optical cable friction coefficient testing device, the pressure mechanism includes two nut seats, two pressure screws, a worm, two worm gears and a servo motor. A control box is fixedly arranged on the upper side of the support frame, and the two nut seats are rotatably arranged on the control box and the support frame. The two pressure screws are respectively threadedly connected to the corresponding nut seats, and the lower ends of the two pressure screws are fixedly connected to the pressure plate. The two worm gears are respectively fixedly sleeved on the corresponding nut seats. The worm is rotatably arranged in the control box, and the worm is meshed with the two worm gears. One end of the worm is transmission-connected to the servo motor.

[0010] In the above-mentioned optical cable friction coefficient testing device, an electric cylinder is fixedly arranged on the support seat, and the output end of the electric cylinder is fixedly connected to a guide frame, and the fixed pulley is rotatably arranged on the guide frame.

[0011] In the above-mentioned optical cable friction coefficient testing device, a slot matching with the pressure sensor is provided on the bottom surface of the pressure plate, a permanent magnet block is fixedly provided on the top of the pressure sensor, and a permanent magnet sheet attracted to the permanent magnet block is fixedly provided in the slot.

[0012] In the above-mentioned optical cable friction coefficient testing device, an electromagnetic sheet is fixedly arranged in the slot, and the electromagnetic sheet generates magnetism to repel the permanent magnet block when electrified.

[0013] In the above-mentioned optical cable friction coefficient testing device, the lower side of the base is fixedly connected to a fixing plate via a plurality of damping spring shock absorbers, and a plurality of self-locking universal wheels are fixedly provided on the lower side of the fixing plate.

[0014] In the above-mentioned optical cable friction coefficient testing device, a plurality of electric push rods are fixedly arranged on the fixed plate, and the output ends of the electric push rods are fixedly connected with friction blocks.

[0015] Compared with the existing technology, the advantages of an optical cable friction coefficient testing device are: In the design of the clamping mechanism, the four lead screws are controlled by the joint control mechanism to rotate synchronously, so that the upper clamp seat can be smoothly and accurately close to the lower clamp seat to adapt to the different thicknesses of the optical cables to be tested. Among them, the transmission coordination of the gear set and the pulley assembly greatly improves the convenience of operation. The operator only needs to turn the knob to adjust the distance between the upper clamp seat and the lower clamp seat. There is no need to frequently replace support rods of different lengths like traditional devices, which saves a lot of time and labor costs. At the same time, the design of the lead screw's thread lead angle is less than the equivalent friction angle, which realizes the self-locking between the lead screw and the upper clamp seat, avoiding the tediousness of manual locking and ensuring the stability and reliability of the clamping process.

[0016] In terms of the pressure mechanism, through the transmission cooperation of the worm and two worm wheels, and the precise control of the servo motor, the two nut seats can rotate synchronously, and then drive the two pressure screws to automatically control the pressure plate to apply pressure to the upper clamp seat. In conjunction with multiple pressure sensors, it can monitor and feedback the pressure value to the PLC controller in real time. The PLC controller takes the average value through a preset program and compares it with the set pressure limit value, automatically and accurately controls the pressure process, avoiding the tediousness and uncertainty of traditional manual pressure control methods, and greatly improving the test efficiency and accuracy. In the slot design of the pressure sensor, the cooperation between the permanent magnet block and the permanent magnet sheet facilitates installation and fixation, and the setting of the electromagnetic sheet facilitates the later disassembly and replacement of the pressure sensor, avoiding the inconvenience of manual extraction.

[0017] During the test, the electric cylinder can adjust the height of the fixed pulley as needed. The function of the fixed pulley is to change the pulling direction of the optical cable to be tested so that it can be more conveniently connected to the universal testing machine. By adjusting the height of the fixed pulley, it can adapt to optical cables of different lengths and different test layouts, thereby improving the versatility and flexibility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front perspective structural schematic diagram of an optical cable friction coefficient testing device provided by the present invention; Figure 2 It is a schematic structural diagram of the cooperation between a support base and a support frame of an optical cable friction coefficient testing device provided by the present invention; Figure 3 It is a structural schematic diagram of the cooperation between a joint control mechanism and a lead screw of an optical cable friction coefficient testing device provided by the present invention; Figure 4 It is a schematic structural diagram of the cooperation between a pressure mechanism and a pressure plate of an optical cable friction coefficient testing device provided by the present invention; Figure 5 It is a schematic diagram of the overall structure of an electric cylinder and a fixed pulley cooperating with each other in an optical cable friction coefficient testing device provided by the present invention; Figure 6 It is a schematic diagram of the internal structure of a slot of an optical cable friction coefficient testing device provided by the present invention; Figure 7 The present invention is a schematic structural diagram of the cooperation between an electric push rod and a friction block of an optical cable friction coefficient testing device provided by the present invention.

[0019] In the figure: 1 base, 2 lifting mechanism, 201 hydraulic cylinder, 3 support seat, 4 support frame, 5 lower clamp seat, 6 lead screw, 7 upper clamp seat, 8 simulated optical cable section, 9 joint control mechanism, 91 pulley assembly, 92 gear set, 93 knob, 10 pressure mechanism, 101 nut seat, 102 pressure screw, 103 worm, 104 worm wheel, 105 servo motor, 11 pressure plate, 12 sensor, 13 fixed pulley, 14 PLC controller, 15 control chamber, 16 control box, 17 electric cylinder, 18 guide frame, 19 slot, 20 permanent magnet block, 21 permanent magnet sheet, 22 electromagnetic sheet, 23 damping spring shock absorber, 24 fixed plate, 25 self-locking universal wheel, 26 electric push rod, 27 friction block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] like Figure 1-Figure 7 As shown, a fiber optic cable friction coefficient testing device includes a base 1, the lower side of the base 1 is fixedly connected to a fixed plate 24 through a plurality of damping spring shock absorbers 23, and a plurality of self-locking universal wheels 25 are fixedly arranged on the lower side of the fixed plate 24. The arrangement of the self-locking universal wheels 25 makes it convenient for the staff to move the entire device. The arrangement of the damping spring shock absorbers 23 can provide shock absorption and buffering during the movement of the device. A plurality of electric push rods 26 are fixedly arranged on the fixed plate 24, and a friction block 27 is fixedly connected to the output end of the electric push rod 26. The arrangement of the electric push rod 26 can control the friction block 27 to be against the ground, thereby ensuring the stability of the entire device when it is not moved.

[0022] A lifting mechanism 2 is provided on the base 1, and the output end of the lifting mechanism 2 is fixedly connected to the support base 3. The lifting mechanism 2 includes two hydraulic cylinders 201, and the two hydraulic cylinders 201 are fixedly provided on the base 1. The output ends of the two hydraulic cylinders 201 are fixedly connected to the support base 3. Through the provided hydraulic cylinders 201, the operating height of the support base 3 can be adjusted as needed.

[0023] A support frame 4 and a lower clamping seat 5 are fixedly arranged on the support seat 3, four lead screws 6 are rotatably arranged between the support frame 4 and the support seat 3, and an upper clamping seat 7 cooperating with the lower clamping seat 5 is threadedly connected between the four lead screws 6, and a plurality of rows of simulated optical cable segments 8 are fixedly bonded to the opposite sides of the upper clamping seat 7 and the lower clamping seat 5, and a linkage control mechanism 9 cooperating with the four lead screws 6 is arranged on the support seat 3.

[0024] The joint control mechanism 9 includes a pulley assembly 91, a gear set 92 and a knob 93. A control chamber 15 is provided on the support seat 3, and the lower ends of the four lead screws 6 extend into the control chamber 15 and are connected through the pulley assembly 91. The knob 93 is rotatably arranged on the support seat 3, and the lower end of the transmission shaft of the knob 93 extends into the control chamber 15 and is connected through the gear set 92 to one of the lead screws 6. The thread lead angle of the lead screw 6 is smaller than the equivalent friction angle. Through the transmission coordination of the gear set 92 and the pulley assembly 91, the knob 93 can synchronously control the rotation of the four lead screws 6, which greatly improves the convenience of operation, and the distance between the upper clamp seat 7 and the lower clamp seat 5 can be adjusted as needed. In addition, the thread lead angle design of the lead screw 6 can realize self-locking between the lead screw 6 and the upper clamp seat 7, avoiding the tediousness of manual locking.

[0025] A pressure mechanism 10 is provided on the support frame 4, and the output end of the pressure mechanism 10 is fixedly connected to a pressure plate 11 that cooperates with the upper clamp seat 7, and a plurality of pressure sensors 12 are fixedly installed on the lower side of the pressure plate 11. By setting up the plurality of pressure sensors 12, the pressure values ​​of multiple positions of the pressure plate 11 can be synchronously measured, thereby reducing the measurement error caused by uneven local pressure. Taking the average value can make the measurement result better reflect the overall pressure situation and improve the accuracy of the measurement.

[0026] A slot 19 that matches the pressure sensor 12 is provided on the bottom surface of the pressure plate 11. A permanent magnet block 20 is fixedly arranged on the top of the pressure sensor 12, and a permanent magnet sheet 21 that attracts the permanent magnet block 20 is fixedly arranged in the slot 19. The coordination between the permanent magnet block 20 and the permanent magnet sheet 21 facilitates the fixed arrangement of the pressure sensor 12 in the slot 19. An electromagnetic sheet 22 is fixedly arranged in the slot 19, and the electromagnetic sheet 22 is energized to generate magnetism to repel the permanent magnet block 20. The arrangement of the electromagnetic sheet 22 allows the electromagnetic sheet 22 to be energized to generate magnetism to repel the pressure sensor 12 when the pressure sensor 12 needs to be disassembled and replaced in the later stage, so that the pressure sensor 12 is automatically discharged, thereby avoiding the inconvenience of manual extraction.

[0027] The pressure mechanism 10 includes two nut seats 101, two pressure screws 102, a worm 103, two worm gears 104 and a servo motor 105. A control box 16 is fixedly arranged on the upper side of the support frame 4, and the two nut seats 101 are rotatably arranged on the control box 16 and the support frame 4. The two pressure screws 102 are respectively threadedly connected with the corresponding nut seats 101, and the lower ends of the two pressure screws 102 are fixedly connected with the pressure plate 11. The two worm gears 104 are respectively fixedly sleeved on the corresponding nut seats 101, and the worm 103 is rotated. It is arranged in the control box 16, and the worm 103 is meshed with the two worm wheels 104, and one end of the worm 103 is connected to the servo motor 105. Through the transmission coordination of the worm 103 and the two worm wheels 104, the servo motor 105 can control the two nut seats 101 to rotate synchronously, so that the two pressure screws 102 can automatically control the pressure plate 11 to apply pressure to the upper clamping seat 7, and in conjunction with each pressure sensor 12, the pressure can be automatically and accurately controlled, avoiding the tediousness of manual control and greatly improving the test efficiency.

[0028] A fixed pulley 13 is rotatably provided on the support seat 3, a PLC controller 14 is fixedly provided on the support frame 4, and the PLC controller 14 is used to control the start and close procedures of various electrical equipment, an electric cylinder 17 is fixedly provided on the support seat 3, and the output end of the electric cylinder 17 is fixedly connected to a guide frame 18, the fixed pulley 13 is rotatably provided on the guide frame 18, and the setting of the electric cylinder 17 can adjust the use height of the fixed pulley 13 as needed.

[0029] The operating principle of the present invention is now described as follows: At the beginning of the test, the optical cable to be tested is carefully placed at a specific position between the upper clamp seat 7 and the lower clamp seat 5. Then, the operator turns the knob 93. At this time, with the help of the precise transmission cooperation of the gear set 92 and the efficient transmission cooperation of the pulley assembly 91, the four lead screws 6 can achieve synchronous rotation. This synchronous rotation mechanism ensures that the upper clamp seat 7 can move downward smoothly and accurately. In this process, the upper clamp seat 7 gradually approaches the optical cable to be tested until the simulated optical cable section 8 on the upper clamp seat 7 fits tightly with the optical cable to be tested. This tight fit is crucial for subsequent tests, and it can ensure stability and accuracy during the test.

[0030] Subsequently, the pressure limit value required for each pressure sensor 12 is set through the PLC controller 14. As the core control unit of the entire test system, the PLC controller 14 is highly intelligent and accurate. It can automatically and accurately control the pressure plate 11 to apply the required pressure value according to the set pressure limit value. During the pressurizing process, the PLC controller 14 first controls the servo motor 105 to rotate forward. The servo motor 105 provides a reliable power source for the entire pressurizing process with its high-precision control performance. With the precise transmission cooperation of the worm 103 and the two worm wheels 104, the two nut seats 101 rotate synchronously. This synchronous rotation mechanism ensures that the two pressure screws 102 can drive the pressure plate 11 downward at the same speed and force, thereby pressing the upper clamp seat 7.

[0031] During the pressure application process, each pressure sensor 12 plays a key role. They can monitor in real time and quickly feed back the generated pressure values ​​in the form of electrical signals to the PLC controller 14. After receiving these feedback signals, the PLC controller 14 will perform calculations and processing through a preset program. Specifically, it will take the average value of the feedback values ​​of each pressure sensor 12. This average value can more accurately reflect the actual applied pressure value. Then, this average value is compared with the set required pressure value. In this way, the PLC controller 14 can monitor the pressure application process in real time to ensure that the applied pressure always remains within the required range. When the applied pressure reaches the required value, the PLC controller 14 will respond quickly and automatically shut down the servo motor 105. This automatic and precise pressure control mechanism not only greatly improves the efficiency and accuracy of the test, but also avoids the tediousness and uncertainty of traditional manual pressure control methods.

[0032] After completing the pressure application step, one end of the optical cable to be tested is passed around the fixed pulley 13. The function of the fixed pulley 13 is to change the pulling direction of the optical cable to be tested so that it can be more conveniently connected to the universal testing machine. The optical cable to be tested is tightly connected to the universal testing machine through the traction clamp. As an existing equipment, the universal testing machine can pull the optical cable to be tested at a uniform speed. In this process, the universal testing machine can accurately record the pressure value of the optical cable to be tested, which is crucial for the subsequent calculation of the dynamic friction coefficient μ.

[0033] Finally, the staff can obtain the dynamic friction coefficient μ through the formula μ=F0 / 2F, where F is the positive pressure, which is composed of the sum of the positive pressure value applied by the pressure-applying mechanism 10 and the gravity value of the upper clamp seat 7. This positive pressure value is obtained through the precise control of the PLC controller 14 and the real-time monitoring of the pressure sensor 12, and the gravity value of the upper clamp seat 7 is a known fixed value. F0 is the average tension value of the optical cable to be tested recorded by the universal testing machine between the horizontal moving distances. Through this formula, the staff can accurately calculate the dynamic friction coefficient μ of the optical cable to be tested.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical cable friction coefficient testing device, comprising a base (1), characterized in that: The base (1) is provided with a lifting mechanism (2), and the output end of the lifting mechanism (2) is fixedly connected to a support seat (3), a support frame (4) and a lower clamping seat (5) are fixedly provided on the support seat (3), four lead screws (6) are rotatably provided between the support frame (4) and the support seat (3), and an upper clamping seat (7) matched with the lower clamping seat (5) is threadedly connected between the four lead screws (6), a plurality of rows of simulated optical cable segments (8) are fixedly bonded to the opposite sides of the upper clamping seat (7) and the lower clamping seat (5), and the upper side of the support seat (3) is provided with a plurality of rows of simulated optical cable segments (8) fixedly bonded to the upper side of the support seat (3). A joint control mechanism (9) is provided which cooperates with four lead screws (6); a pressure mechanism (10) is provided on the support frame (4); and an output end of the pressure mechanism (10) is fixedly connected to a pressure plate (11) which cooperates with an upper clamping seat (7); a plurality of pressure sensors (12) are fixedly mounted on the lower side of the pressure plate (11); a fixed pulley (13) is rotatably provided on the support seat (3); a PLC controller (14) is fixedly provided on the support frame (4); and the PLC controller (14) is used to control the start and stop procedures of various electrical equipment.

2. The optical cable friction coefficient testing device according to claim 1, characterized in that: The lifting mechanism (2) comprises two hydraulic cylinders (201), and the two hydraulic cylinders (201) are both fixedly arranged on the base (1), and the output ends of the two hydraulic cylinders (201) are both fixedly connected to the support seat (3).

3. The optical cable friction coefficient testing device according to claim 1, characterized in that: The joint control mechanism (9) comprises a pulley assembly (91), a gear set (92) and a knob (93); a control chamber (15) is provided on the support seat (3); the lower ends of the four lead screws (6) extend into the control chamber (15) and are connected to the control chamber via the pulley assembly (91); the knob (93) is rotatably arranged on the support seat (3); the lower end of the transmission shaft of the knob (93) extends into the control chamber (15) and is connected to the control chamber via the gear set (92); the lead angle of the lead screw (6) is smaller than the equivalent friction angle.

4. The optical cable friction coefficient testing device according to claim 1, characterized in that: The pressure mechanism (10) comprises two nut seats (101), two pressure screws (102), a worm (103), two worm wheels (104) and a servo motor (105); a control box (16) is fixedly arranged on the upper side of the support frame (4); the two nut seats (101) are rotatably arranged on the control box (16) and the support frame (4); the two pressure screws (102) are respectively threadedly connected to the corresponding nut seats (101); the lower ends of the two pressure screws (102) are respectively fixedly connected to the pressure plate (11); the two worm wheels (104) are respectively fixedly sleeved on the corresponding nut seats (101); the worm (103) is rotatably arranged in the control box (16); the worm (103) is meshed with the two worm wheels (104); and one end of the worm (103) is transmission-connected to the servo motor (105).

5. The optical cable friction coefficient testing device according to claim 1, characterized in that: An electric cylinder (17) is fixedly arranged on the support seat (3), and an output end of the electric cylinder (17) is fixedly connected to a guide frame (18), and the fixed pulley (13) is rotatably arranged on the guide frame (18).

6. The optical cable friction coefficient testing device according to claim 1, characterized in that: The bottom surface of the pressure plate (11) is provided with a slot (19) that matches the pressure sensor (12), a permanent magnet block (20) is fixedly arranged on the top of the pressure sensor (12), and a permanent magnet sheet (21) that attracts the permanent magnet block (20) is fixedly arranged in the slot (19).

7. The optical cable friction coefficient testing device according to claim 6, characterized in that: An electromagnetic sheet (22) is fixedly arranged in the slot (19), and the electromagnetic sheet (22) generates magnetism when electricity is supplied to repel the permanent magnet block (20).

8. The optical cable friction coefficient testing device according to claim 1, characterized in that: The lower side of the base (1) is fixedly connected to a fixing plate (24) via a plurality of damping spring shock absorbers (23), and a plurality of self-locking universal wheels (25) are fixedly arranged on the lower side of the fixing plate (24).

9. The optical cable friction coefficient testing device according to claim 8, characterized in that: A plurality of electric push rods (26) are fixedly arranged on the fixed plate (24), and a friction block (27) is fixedly connected to the output end of the electric push rod (26).

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