Device for detecting static friction coefficient of inner wall of pipe

Abstract

The utility model relates to the technical field of communication pipelines, and provides a pipe inner wall static friction coefficient detection device which comprises a clamping mechanism, a test bar, an inclination angle adjusting mechanism, a sliding detection piece and an inclination angle detector. In the detection process, firstly, a pipe sample is clamped on the clamping mechanism, then a test bar is placed on the inner wall of a cavity of the pipe sample, the dip angle of the clamping mechanism is adjusted through the dip angle adjusting mechanism until the slippage detection piece detects slippage of the test bar, and at the moment, the dip angle detector detects the angle of the pipe sample; the tangent value of the angle is the static friction coefficient of the pipe sample. Therefore, through the special detection device, the static friction coefficient of the inner wall of the pipe can be simply detected, and the detection efficiency of the static friction coefficient of the inner wall of the pipe is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of communication pipeline technology, and in particular to a device for detecting the static friction coefficient of the inner wall of a pipe. Background Technology

[0002] Currently, the most common method for cable threading in communication ducts is the air-blowing method. The principle is that a cable-blowing machine blows high-pressure, high-speed compressed air into the silicon core tube. The high-pressure airflow pushes an air-sealing piston, which, connected to the end of the optical cable, creates a settable, uniform tension on the cable. Simultaneously, the hydraulic conveyor mechanism of the cable-blowing machine clamps the optical cable and transports it forward, creating a conveying force. The combination of tension and conveying force allows the inserted optical cable to travel rapidly through the duct in a suspended state along with the high-speed airflow. The coefficient of friction of the inner wall of the pipe is extremely important for the air-blowing method. Existing technologies lack dedicated devices for detecting the coefficient of friction of the inner wall of the pipe, and detecting this coefficient is cumbersome, difficult, and inefficient. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a device for detecting the static friction coefficient of the inner wall of pipes.

[0004] This utility model provides a device for testing the static friction coefficient of the inner wall of a pipe, comprising: a clamping mechanism for clamping a pipe sample; a test rod placed on the inner wall of the cavity of the pipe sample; an inclination adjustment mechanism connected to the clamping mechanism; a sliding detection element for detecting the state of the test rod; and an inclination detector for detecting the inclination angle of the pipe sample.

[0005] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The device further includes a control device, which is connected to the sliding detection element and the tilt adjustment mechanism, and is used to control the working state of the tilt adjustment mechanism based on the detection result of the sliding detection element.

[0006] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The clamping mechanism includes an upper pressure plate, a lower support plate, and a clamping adjustment device. The upper pressure plate is disposed above the lower support plate. The lower support plate is connected to the tilt adjustment mechanism. The clamping adjustment device is connected to the upper pressure plate and is used to drive the upper pressure plate to move so as to adjust the distance between the upper pressure plate and the lower support plate.

[0007] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided, wherein the tilt adjustment mechanism includes a motor and a reducer assembly, the motor is connected to the reducer assembly, and the reducer assembly is connected to the lower support plate.

[0008] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The slip detection component includes a photoelectric switch. The control device is connected to the photoelectric switch and the motor, and is used to adjust the working state of the motor based on the detection result of the photoelectric switch.

[0009] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The device further includes a retaining ring, which is used to connect to the tail end of the test rod, and a light-passing gap is formed between the retaining ring and the tail end of the test rod. The photoelectric switch is correspondingly disposed at the position of the light-passing gap.

[0010] According to the present invention, in the static friction coefficient detection device for the inner wall of a pipe, the photoelectric switch is in a closed state when the test rod is not slipping, and in a closed state when the test rod is slipping.

[0011] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. When the photoelectric switch is in the open state, the control device controls the motor to stop rotating and records the detection result of the tilt detector; when the photoelectric switch is in the closed state, the control device controls the motor to rotate.

[0012] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The device for detecting the static friction coefficient of the inner wall of a pipe also includes a support, and the speed reducer is connected to the lower support plate through the support.

[0013] According to the present invention, a device for detecting the static friction coefficient of the inner wall of a pipe is provided. The device further includes a horizontal detection mechanism, which is disposed on the lower support plate to detect the horizontal state of the lower support plate. A manual adjustment switch is provided on the motor.

[0014] The device for testing the static friction coefficient of the inner wall of pipes provided by this utility model includes a clamping mechanism, a test rod, an inclination adjustment mechanism, a sliding detection element, and an inclination detector. The clamping mechanism is used to clamp the pipe sample. The pipe sample has a hollow structure. The test rod can be placed inside the cavity of the pipe sample. The inclination adjustment mechanism is connected to the clamping mechanism and can adjust the angle of the clamping mechanism, thereby changing the angle of the pipe sample and the test rod. The sliding detection element can detect the state of the test rod, i.e., whether the test rod is in a stationary or sliding state. The inclination detector can detect the inclination angle of the pipe sample.

[0015] With this structural design, during the testing process, the pipe sample is first clamped onto the clamping mechanism, and then the test bar is placed on the inner wall of the pipe sample's cavity. The tilt angle of the clamping mechanism is adjusted by the tilt angle adjustment mechanism until the sliding detection element detects the sliding of the test bar. At this point, the tilt angle detector detects the angle of the pipe sample, and the tangent of this angle is the static friction coefficient of the pipe sample. Therefore, this dedicated testing device can easily detect the static friction coefficient of the pipe's inner wall, greatly improving the testing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a simplified schematic diagram of the main structure of the pipe static friction coefficient testing device provided by this utility model.

[0018] Figure 2 This is a simplified side view of the pipe static friction coefficient testing device provided by this utility model.

[0019] Figure 3 This is a diagram showing the positional relationship between the sliding detection element and the retaining ring in the pipe static friction coefficient testing device provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the sample and retaining ring in the pipe static friction coefficient testing device provided by this utility model.

[0021] Reference numerals: 110, upper pressure plate; 120, lower support plate; 130, clamping adjustment device; 131, rack and pinion pressure roller lifting structure; 132, ratchet fine-tuning wrench; 133, return spring; 200, pipe sample; 300, test bar; 310, retaining ring; 410, motor; 420, first worm gear reducer; 430, second worm gear reducer; 500, slippage detection piece; 600, tilt detector; 700, control device; 800, bracket; 900, level detection mechanism. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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 the embodiments of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0025] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, to make the objectives, technical solutions, and advantages of the present invention clearer. The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The following is combined with Figures 1 to 4 This invention describes a device for detecting the static friction coefficient of the inner wall of a pipe, as provided in an embodiment of the present invention. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0028] An embodiment of this utility model provides a device for detecting the static friction coefficient of the inner wall of a pipe, such as... Figure 1 and Figure 2 As shown, the device for detecting the static friction coefficient of the inner wall of the pipe includes: a clamping mechanism for clamping the pipe sample 200; a test rod 300 placed on the inner wall of the cavity of the pipe sample 200; an inclination adjustment mechanism connected to the clamping mechanism; a sliding detection element 500 for detecting the state of the test rod 300; and an inclination detector 600 for detecting the inclination angle of the pipe sample 200.

[0029] The device for testing the static friction coefficient of the inner wall of a pipe provided by this utility model includes a clamping mechanism, a test rod 300, an inclination adjustment mechanism, a sliding detection element 500, and an inclination detector 600. The clamping mechanism is used to clamp the pipe sample 200. The pipe sample 200 has a hollow structure. The test rod 300 can be placed inside the cavity of the pipe sample 200. The inclination adjustment mechanism is connected to the clamping mechanism and can adjust the angle of the clamping mechanism, thereby changing the angle of the pipe sample 200 and the test rod 300. The sliding detection element 500 can detect the state of the test rod 300, i.e., whether the test rod 300 is in a stationary or sliding state. The inclination detector 600 can detect the inclination angle of the pipe sample 200.

[0030] With this structural setup, during the testing process, the pipe sample 200 is first clamped onto the clamping mechanism, and then the test bar 300 is placed on the inner wall of the cavity of the pipe sample 200. The tilt angle of the clamping mechanism is adjusted by the tilt angle adjustment mechanism until the sliding detection element 500 detects the sliding of the test bar 300. At this point, the tilt angle detector 600 detects the angle of the pipe sample 200, and the tangent of this angle is the static friction coefficient of the pipe sample 200. Therefore, this dedicated testing device can easily detect the static friction coefficient of the inner wall of the pipe, greatly improving the testing efficiency.

[0031] In one embodiment of the present invention, the clamping mechanism includes an upper pressure plate 110, a lower support plate 120, and a clamping adjustment device 130.

[0032] The upper pressure plate 110 is positioned above the lower support plate 120. The lower support plate 120 is connected to the tilt adjustment mechanism. The clamping adjustment device 130 is connected to the upper pressure plate 110 and is used to move the upper pressure plate 110 to adjust the distance between the upper pressure plate 110 and the lower support plate 120.

[0033] For example, such as Figure 1 and Figure 2 As shown, both the upper surface of the lower support plate 120 and the lower surface of the upper pressure plate 110 are provided with arc-shaped grooves adapted to the pipe sample 200. The pipe sample 200 can be clamped in the arc-shaped grooves of the lower support plate 120 and the upper pressure plate 110. The upper pressure plate 110 is connected to a clamping adjustment device 130, which can adjust the distance between the upper pressure plate 110 and the lower support plate 120 so that the testing device is suitable for testing pipe samples 200 of different diameters.

[0034] In one embodiment of this utility model, such as Figure 2As shown, the clamping adjustment device 130 includes a coarse adjustment structure and a fine adjustment structure. For example, the coarse adjustment structure can be a rack and pinion roller lifting structure 131, which is similar to a tire expander. The fine adjustment structure is a ratchet fine adjustment wrench 132. Square holes are provided on both the upper pressure plate 110 and the lower support plate 120. The upper end of the rack of the rack and pinion roller lifting structure 131 passes through the square holes on the upper pressure plate 110 and the lower support plate 120. A retaining plate is provided at the lower end of the rack to prevent the meshing pressure roller on the rack from falling off. A return spring 133 is sleeved on the rack of the rack and pinion roller lifting structure 131 and is located between the upper pressure plate 110 and the lower support plate 120. The head screw of the ratchet fine adjustment wrench 132 is connected to the upper end of the rack of the rack and pinion roller lifting structure 131.

[0035] When a large-scale adjustment is needed between the upper pressure plate 110 and the lower support plate 120, the adjustment is made through the rack and pinion pressure roller lifting structure 131. Specifically, the pressure roller handle in the rack and pinion pressure roller lifting structure 131 is repeatedly lifted and pressed. When a small-scale fine adjustment is needed between the upper pressure plate 110 and the lower support plate 120, the adjustment is made through the ratchet fine-tuning wrench 132. Specifically, the head screw in the ratchet fine-tuning wrench 132 is rotated clockwise or counterclockwise.

[0036] In one embodiment of this utility model, the pipe inner wall static friction coefficient detection device further includes a control device 700. The control device 700 is connected to the sliding detection element 500 and the tilt adjustment mechanism, and is used to control the working state of the tilt adjustment mechanism based on the detection result of the sliding detection element 500.

[0037] Furthermore, in one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the tilt adjustment mechanism includes a motor 410 and a reducer unit. The motor 410 is connected to the reducer unit, and the reducer unit is connected to the lower support plate 120.

[0038] In another embodiment of this utility model, the slip detection element 500 includes a photoelectric switch.

[0039] The control device 700 is connected to the photoelectric switch and the motor 410 and is used to adjust the working state of the motor 410 based on the detection result of the photoelectric switch.

[0040] In another embodiment of this utility model, such as Figure 3 and Figure 4 As shown, the device for detecting the static friction coefficient of the inner wall of the pipe also includes a retaining ring 310, which is used to connect to the tail end of the test rod 300, and a light-passing gap is formed between the retaining ring 310 and the tail end of the test rod 300. The photoelectric switch is correspondingly set at the position of the light-passing gap.

[0041] In one embodiment of this utility model, the photoelectric switch is in a closed state when the test rod 300 is not sliding, and in a closed state when the test rod 300 is sliding.

[0042] In one embodiment of this utility model, when the photoelectric switch is in the off state, the control device 700 controls the motor 410 to stop rotating and records the detection result of the tilt detector 600; when the photoelectric switch is in the closed state, the control device 700 controls the motor 410 to rotate.

[0043] In one embodiment of this utility model, the pipe inner wall static friction coefficient testing device further includes a horizontal detection mechanism 900. For example, the horizontal detection mechanism 900 is a level, which is disposed on the lower support plate 120 to detect the horizontal state of the lower support plate 120. When the lower support plate 120 is in a horizontal state, the pipe sample 200 is also in a horizontal state. When the lower support plate 120 is in an inclined state, the rotation of the motor 410 can be adjusted by a manual adjustment switch on the motor 410 until the lower support plate 120 is in a horizontal state.

[0044] like Figure 1 and Figure 2 As shown, the reducer assembly includes a first worm gear reducer 420 and a second worm gear reducer 430. For example, the transmission ratio of the first worm gear reducer 420 is 100, and the transmission ratio of the second worm gear reducer 430 is 10. The input port of the first worm gear reducer 420 is connected to the output port of the second worm gear reducer 430 via a connecting shaft, and the rotating shaft of the motor 410 is inserted into the input port of the second worm gear reducer 430. Thus, for every 1000 revolutions of the motor 410, the first worm gear reducer 420 rotates 1 revolution. The first worm gear reducer 420 is connected to the lower support plate 120. In one embodiment of this utility model, a bracket 800 can be installed between the first worm gear reducer 420 and the lower support plate 120. That is, the first worm gear reducer 420 drives the lower support plate 120 to rotate via the bracket 800, and the lower support plate 120 drives the tube sample 200 to rotate to adjust the angle. A torsion spring can also be installed between the first worm gear reducer 420 and the bracket 800 to prevent the bracket 800 and the structure mounted on it from swaying left and right due to the shaft clearance of the first worm gear reducer 420.

[0045] In the specific testing process, a 500mm pipe sample 200 is placed in the arc-shaped groove of the lower support plate 120. The pressure wheel handle of the rack and pinion pressure wheel lifting structure 131 is repeatedly lifted and pressed to move the upper pressure plate 110 closer to the lower support plate 120 to press the pipe sample 200. Then, the ratchet fine-tuning wrench 132 is repeatedly rotated to make the upper pressure plate 110 continue to press down until the surface of the pipe sample 200 is pressed tightly by the upper pressure plate 110 and the lower support plate 120.

[0046] The lower support plate 120 is leveled by observing a level, which in turn levels the pipe sample 200. When the pipe sample 200 is level, the control device 700 is activated; for example, the control device 700 is a digital display controller. The digital display controller is connected to the motor 410, a photoelectric switch, and an inclination detector 600. When the test bar 300 is stationary, the photoelectric switch at its tail is closed. At this time, the digital display controller can control the motor 410 to rotate continuously and uniformly in one direction, causing the upper pressure plate 110, the lower support plate 120, the pipe sample 200, and the test bar 300 to change their inclination angles uniformly. When the test bar 300 begins to slide down, the photoelectric switch is blocked by the retaining ring 310 and is in the open state. At this time, the digital display controller controls the motor 410 to stop rotating and controls the inclination detector 600 to measure the inclination angle of the lower support plate 120 in this state, thereby reflecting the inclination angle of the pipe sample 200. The digital display controller can calculate the tangent of the tilt angle, which is the static friction coefficient of the pipe sample 200. In actual measurement, the experiment can be repeated multiple times, and the arithmetic mean of the multiple measurements can be taken as the final static friction coefficient test value.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for detecting the static friction coefficient of the inner wall of a pipe, characterized in that, include: A clamping mechanism for clamping a tubular sample (200). Test bar (300), the test bar (300) is placed on the inner wall of the cavity of the tubular sample (200); A tilt adjustment mechanism, which is connected to the clamping mechanism; A slip detection element (500) is used to detect the state of the test bar (300); Inclination detector (600) is used to detect the inclination angle of the pipe sample (200).

2. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 1, characterized by The device for detecting the static friction coefficient of the inner wall of the pipe also includes a control device (700). The control device (700) is connected to the slip detection element (500) and the tilt adjustment mechanism, and is used to control the working state of the tilt adjustment mechanism based on the detection result of the slip detection element (500).

3. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 2, characterized by The clamping mechanism includes an upper pressure plate (110), a lower support plate (120), and a clamping adjustment device (130). The upper pressure plate (110) is positioned above the lower support plate (120), the lower support plate (120) is connected to the tilt adjustment mechanism, and the clamping adjustment device (130) is connected to the upper pressure plate (110) to drive the upper pressure plate (110) to move, thereby adjusting the distance between the upper pressure plate (110) and the lower support plate (120).

4. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 3, characterized by The tilt adjustment mechanism includes a motor (410) and a reducer assembly. The motor (410) is connected to the reducer assembly, and the reducer assembly is connected to the lower support plate (120).

5. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 4, characterized by The slip detection element (500) includes a photoelectric switch. The control device (700) is connected to the photoelectric switch and the motor (410) and is used to adjust the working state of the motor (410) based on the detection result of the photoelectric switch.

6. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 5, wherein The device for detecting the static friction coefficient of the inner wall of the pipe also includes a retaining ring (310), which is used to connect to the tail end of the test rod (300), and a light-passing gap is formed between the retaining ring (310) and the tail end of the test rod (300), and the photoelectric switch is correspondingly disposed at the position of the light-passing gap.

7. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 6, characterized by When the test rod (300) is not sliding, the photoelectric switch is in a closed state; when the test rod (300) is sliding, the photoelectric switch is in an open state.

8. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 7, characterized by When the photoelectric switch is in the off state, the control device (700) controls the motor (410) to stop rotating and records the detection result of the tilt detector (600); When the photoelectric switch is in the closed state, the control device (700) controls the motor (410) to rotate.

9. The apparatus for detecting the static friction coefficient of the inner wall of a pipe according to claim 4, characterized by The device for detecting the internal static friction coefficient of the pipe also includes a bracket (800), and the speed reducer unit is connected to the lower support plate (120) through the bracket (800).

10. The pipe inner wall static friction coefficient detection device according to any one of claims 4 to 9, characterized by, The pipe inner wall static friction coefficient detection device further comprises a horizontal detection mechanism (900) arranged on the lower supporting plate (120) to detect the horizontal state of the lower supporting plate (120), and the motor (410) is provided with a manual adjustment switch.

Images