Device for detecting static friction coefficient of inner wall of pipe

Abstract

The invention 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] The present invention relates to the technical field of communication pipelines, and in particular, to a device for detecting the static friction coefficient of the inner wall of a pipe. Background Art

[0002] At present, the most commonly used method for cable threading in communication pipelines is the air blowing method. Its principle is that a cable blowing machine blows high-pressure and high-speed compressed air into a silicon core pipe. The high-pressure air flow pushes an air seal piston, and the air seal piston connected to the end of the optical cable forms a settable uniform pulling force on the optical cable. At the same time, the hydraulic crawler conveying mechanism of the cable blowing machine holds the optical cable and conveys it forward to form a conveying force. The combination of the pulling force and the conveying force enables the inserted optical cable to quickly pass through the pipeline in a suspended state along with the high-speed air flow. And the friction coefficient of the inner wall of the pipe is extremely important for cable threading by the air blowing method. In the prior art, there are few devices specifically for detecting the friction coefficient of the inner wall of the pipe. Detecting the friction coefficient of the inner wall of the pipe is rather cumbersome and difficult, and the detection efficiency is relatively low. Summary of the Invention

[0003] In view of the above technical problems, the present invention provides a device for detecting the static friction coefficient of the inner wall of a pipe.

[0004] The present invention provides a device for detecting the static friction coefficient of the inner wall of a pipe, including: a clamping mechanism for clamping a pipe specimen; a test rod placed on the inner wall of the cavity of the pipe specimen; an inclination adjustment mechanism connected to the clamping mechanism; a sliding detection member for detecting the state of the test rod; and an inclination detector for detecting the inclination angle of the pipe specimen.

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

[0006] According to the device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, the clamping mechanism includes an upper pressing plate, a lower supporting plate and a clamping adjustment device. Among them, the upper pressing plate is relatively arranged above the lower supporting plate, the lower supporting plate is connected to the inclination adjustment mechanism, and the clamping adjustment device is connected to the upper pressing plate and is used to drive the upper pressing plate to move so as to adjust the distance between the upper pressing plate and the lower supporting plate.

[0007] According to the device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, the inclination adjustment device includes a motor and a speed reduction unit. The motor is connected to the speed reduction unit, and the speed reduction unit is connected to the lower supporting plate.

[0008] According to a device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, the slip detection member includes a photoelectric switch, and 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 a device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, the device for detecting the static friction coefficient of the inner wall of the pipe further includes a retaining ring, the retaining ring is used to be connected 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, and the photoelectric switch is correspondingly arranged at the position of the light-passing gap.

[0010] According to a device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, in a state where the test rod does not slip, the photoelectric switch is in a closed state, and in a state where the test rod slips, the photoelectric switch is in an open state.

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

[0012] According to a device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, the device for detecting the internal static friction coefficient of the pipe further includes a bracket, and the speed reduction unit is connected to the lower support plate through the bracket.

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

[0014] In the device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, it includes a clamping mechanism, a test rod, an inclination adjustment mechanism, a slip detection member and an inclination detector. Among them, the clamping mechanism is used to clamp the pipe sample. The pipe sample is 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 the inclination adjustment mechanism can adjust the angle of the clamping mechanism, thereby changing the angles of the pipe sample and the test rod. The slip detection member can detect the state of the test rod, that is, whether the test rod is in a stationary state or;,. a sliding state. The inclination detector can detect the inclination angle of the pipe sample.

[0015] With this structural arrangement, during the detection process, first, the pipe sample is clamped on the clamping mechanism, then the test rod is placed on the inner wall of the cavity of the pipe sample, and the inclination angle of the clamping mechanism is adjusted through the inclination angle adjustment mechanism until the slip detection member detects the slip of the test rod. At this time, the inclination angle detector detects the angle of the pipe sample, and the tangent value of this angle is the static friction coefficient of the pipe sample. Thus, through this special detection device, the static friction coefficient of the inner wall of the pipe can be detected relatively simply, greatly improving the detection efficiency of the static friction coefficient of the inner wall of the pipe. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is the front view structural schematic diagram of the pipe static friction coefficient detection device provided by the present invention.

[0018] Figure 2 is the side view structural schematic diagram of the pipe static friction coefficient detection device provided by the present invention.

[0019] Figure 3 is the positional relationship diagram of the slip detection member and the retaining ring in the pipe static friction coefficient detection device provided by the present invention.

[0020] Figure 4 is the structural schematic diagram of the sample and the retaining ring in the pipe static friction coefficient detection device provided by the present invention.

[0021] Reference Numerals: 110, upper pressure plate; 120, lower support plate; 130, clamping adjustment device; 131, rack and pinion lifting structure; 132, ratchet fine-tuning wrench; 133, return spring; 200, pipe sample; 300, test rod; 310, retaining ring; 410, motor; 420, first worm and worm gear reducer; 430, second worm and worm gear reducer; 500, slip detection member; 600, inclination angle detector; 700, control device; 800, support; 900, horizontal detection mechanism. Detailed Embodiments

[0022] The following will further describe in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] The following will be combined with Figures 1 to 4 to describe a device for detecting the static friction coefficient of the inner wall of a pipe provided by an embodiment of the present invention. It should be understood that the following is only a schematic embodiment of the present invention and does not constitute any special limitation on the present invention.

[0028] An embodiment of the present invention provides a device for detecting the static friction coefficient of the inner wall of a pipe, as Figure 1 and Figure 2 shown. The device for detecting the static friction coefficient of the inner wall of a pipe includes: a clamping mechanism for clamping a pipe specimen 200; a test rod 300 placed on the inner wall of the cavity of the pipe specimen 200; an inclination adjustment mechanism connected to the clamping mechanism; a slip detection member 500 for detecting the state of the test rod 300; and an inclination detector 600 for detecting the inclination angle of the pipe specimen 200.

[0029] In the device for detecting the static friction coefficient of the inner wall of a pipe provided by the present invention, it includes a clamping mechanism, a test rod 300, an inclination adjustment mechanism, a slip detection member 500, and an inclination detector 600. Among them, 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 on the inner cavity of the pipe sample 200. The inclination adjustment mechanism is connected to the clamping mechanism, and the inclination adjustment mechanism can adjust the angle of the clamping mechanism, thereby changing the angles of the pipe sample 200 and the test rod 300. The slip detection member 500 can detect the state of the test rod 300, that is, whether the test rod 300 is in a static state or a sliding state. The inclination detector 600 can detect the inclination angle of the pipe sample 200.

[0030] With this structural arrangement, during the detection process, first, the pipe sample 200 is clamped on the clamping mechanism, then the test rod 300 is placed on the inner wall of the cavity of the pipe sample 200, and the inclination angle of the clamping mechanism is adjusted through the inclination adjustment mechanism until the slip detection member 500 detects the slip of the test rod 300. At this time, the inclination detector 600 detects the angle of the pipe sample 200, and the tangent value of this angle is the static friction coefficient of the pipe sample 200. Thus, through this dedicated detection device, the static friction coefficient of the inner wall of the pipe can be detected more simply, greatly improving the detection efficiency of the static friction coefficient of the inner wall of the pipe.

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

[0032] Among them, the upper pressing plate 110 is relatively arranged above the lower supporting plate 120. The lower supporting plate 120 is connected to the inclination adjustment mechanism, and the clamping adjustment device 130 is connected to the upper pressing plate 110 and is used to drive the upper pressing plate 110 to move to adjust the distance between the upper pressing plate 110 and the lower supporting plate 120.

[0033] For example, as Figure 1 and Figure 2 shown, arc-shaped grooves adapted to the pipe sample 200 are provided on the upper surface of the lower supporting plate 120 and the lower surface of the upper pressing plate 110. The pipe sample 200 can be clamped in the arc-shaped grooves of the lower supporting plate 120 and the upper pressing plate 110. The upper pressing plate 110 is connected with a clamping adjustment device 130, which can adjust the distance between the upper pressing plate 110 and the lower supporting plate 120 to make the detection device suitable for detecting pipe samples 200 with different diameters.

[0034] In an embodiment of the present invention, 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 lifting structure 131, which is similar to an expander. The fine adjustment structure is a ratchet fine adjustment wrench 132. Square holes are provided on both the upper pressing plate 110 and the lower supporting plate 120. The upper end of the rack of the rack and pinion lifting structure 131 passes through the square holes on the upper pressing plate 110 and the lower supporting plate 120, and a clamping plate is provided at the lower end of the rack to prevent the meshing and pressing wheel on the rack from falling off. The return spring 133 is sleeved on the rack of the rack and pinion lifting structure 131 and is located between the upper pressing plate 110 and the lower supporting plate 120. The head of the ratchet fine adjustment wrench 132 is screwed to the upper end of the rack of the rack and pinion lifting structure 131.

[0035] When a large range of adjustment of the distance between the upper pressing plate 110 and the lower supporting plate 120 is required, it is adjusted through the rack and pinion lifting structure 131. Specifically, the pressing wheel handle in the rack and pinion lifting structure 131 is repeatedly lifted and pressed; when a small range of fine adjustment of the distance between the upper pressing plate 110 and the lower supporting plate 120 is required, it is adjusted through the ratchet fine adjustment wrench 132. Specifically, the head screw in the ratchet fine adjustment wrench 132 is rotated clockwise or counterclockwise.

[0036] In an embodiment of the present invention, the pipe inner wall static friction coefficient detection device further includes a control device 700. The control device 700 is connected to the slip detection member 500 and the inclination adjustment mechanism, and is used to control the working state of the inclination adjustment mechanism based on the detection result of the slip detection member 500.

[0037] Further, in an embodiment of the present invention, as Figure 1 and Figure 2 shown, the inclination adjustment device includes a motor 410 and a speed reduction unit. The motor 410 is connected to the speed reduction unit, and the speed reduction unit is connected to the lower supporting plate 120.

[0038] In another embodiment of the present invention, the slip detection member 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 the present invention, as Figure 3 and Figure 4 shown, the pipe inner wall static friction coefficient detection device further includes a retaining ring 310. The retaining ring 310 is used to be connected 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 arranged at the position of the light passing gap.

[0041] In an embodiment of the present invention, when the test rod 300 does not slip, the optoelectronic switch is in a closed state, and when the test rod 300 slips, the optoelectronic switch is in an open state.

[0042] In an embodiment of the present invention, when the optoelectronic switch is in an open state, the control device 700 controls the motor 410 to stop rotating and records the detection result of the inclination detector 600; when the optoelectronic switch is in a closed state, the control device 700 controls the motor 410 to rotate.

[0043] In an embodiment of the present invention, the static friction coefficient detection device for the inner wall of the pipe further includes a level detection mechanism 900. For example, the level detection mechanism 900 is a level, and the level detection mechanism 900 is arranged 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 motor 410 can be adjusted to rotate through the manual adjustment switch provided on the motor 410 until the lower support plate 120 is in a horizontal state.

[0044] As Figure 1 and Figure 2 shown, the speed reduction unit includes a first worm and worm gear reducer 420 and a second worm and worm gear reducer 430. For example, the transmission ratio of the first worm and worm gear reducer 420 is 100, and the transmission ratio of the second worm and worm gear reducer 430 is 10. The input hole of the first worm and worm gear reducer 420 is connected to the output shaft hole of the second worm and worm gear reducer 430 through a connecting shaft, and the rotating shaft of the motor 410 is inserted into the input hole of the second worm and worm gear reducer 430. Thus, for every 1000 rotations of the motor 410, the first worm and worm gear reducer 420 rotates 1 rotation. The first worm and worm gear reducer 420 is connected to the lower support plate 120. In an embodiment of the present invention, a bracket 800 can be installed between the first worm and worm gear reducer 420 and the lower support plate 120. That is to say, the first worm and worm gear reducer 420 drives the lower support plate 120 to rotate through the bracket 800, and the lower support plate 120 drives the pipe sample 200 to rotate to adjust the angle. A torsion spring can also be installed between the first worm and worm gear reducer 420 and the bracket 800 to prevent the bracket 800 and the structures arranged thereon from swaying left and right due to the axial clearance of the first worm and worm gear reducer 420.

[0045] In the specific detection process, the 500-mm pipe sample 200 is placed in the arc-shaped groove of the lower support plate 120, and the pressing wheel handle of the rack and pressing wheel lifting structure 131 is repeatedly lifted and pressed, so that the upper pressing plate 110 moves towards the lower support plate 120 to press the pipe sample 200, and then the ratchet fine-tuning wrench 132 is repeatedly rotated to make the upper pressing plate 110 continue to press down until the surface of the pipe sample 200 is tightly pressed by the upper pressing plate 110 and the lower support plate 120.

[0046] The lower pallet 120 is horizontally calibrated by observing the spirit level, and then the pipe specimen 200 is horizontally calibrated. When the pipe specimen 200 is in a horizontal state, the control device 700 is started. For example, the control device 700 is a digital display controller. The digital display controller is connected to the motor 410, the photoelectric switch, and the inclination detector 600. When the test rod 300 is in a static state, the photoelectric switch at its tail is in a closed state. At this time, the digital display controller can control the motor 410 to continuously rotate uniformly in one direction, and drive the upper pressing plate 110, the lower pallet 120, the pipe specimen 200, and the inclination of the test rod 300 to change uniformly. When the test rod 300 starts to slide down, the photoelectric switch is blocked by the retaining ring 310 and is in an 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 of the lower pallet 120 in this state, thereby reflecting the inclination of the pipe specimen 200. The digital display controller can calculate the tangent value of this inclination, and the tangent value is the static friction coefficient of the pipe specimen 200. In the actual measurement process, the experiment can be repeated multiple times, and the arithmetic mean of multiple measurements is taken as the final detection value of the static friction coefficient.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting the static friction coefficient of the inner wall of a pipe, characterized in that, Comprising: A clamping mechanism for clamping a pipe specimen (200); A test bar (300) placed on the inner wall of the cavity of the pipe specimen (200); An inclination adjustment mechanism connected to the clamping mechanism; A slip detection member (500) for detecting the state of the test bar (300); An inclination detector (600) for detecting the inclination angle of the pipe specimen (200).

2. The inner wall static friction coefficient detection device for pipe materials according to claim 1, characterized in that, The pipe inner wall static friction coefficient detection device further includes a control device (700), The control device (700) is connected to the slip detection member (500) and the inclination adjustment mechanism, and is used to control the working state of the inclination adjustment mechanism based on the detection result of the slip detection member (500).

3. The inner wall static friction coefficient detection device for pipe materials according to claim 2, wherein The clamping mechanism includes an upper pressure plate (110), a lower support plate (120) and a clamping adjustment device (130), Wherein, the upper pressure plate (110) is relatively arranged above the lower support plate (120), the lower support plate (120) is connected to the inclination adjustment mechanism, and the clamping adjustment device (130) is connected to the upper pressure plate (110) for driving the upper pressure plate (110) to move to adjust the distance between the upper pressure plate (110) and the lower support plate (120).

4. The inner wall static friction coefficient detection device for pipe materials according to claim 3, characterized in that, The inclination adjustment device includes a motor (410) and a speed reduction unit, the motor (410) is connected to the speed reduction unit, and the speed reduction unit is connected to the lower support plate (120).

5. The inner wall static friction coefficient detection device for pipe materials according to claim 4, characterized in that, The slip detection member (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 inner wall static friction coefficient detection device for pipe materials according to claim 5, characterized in that The pipe inner wall static friction coefficient detection device further includes a retaining ring (310) for connecting to the tail end of the test bar (300), and a light-passing gap is formed between the retaining ring (310) and the tail end of the test bar (300), and the photoelectric switch is correspondingly arranged at the position of the light-passing gap.

7. The device for detecting the static friction coefficient of the inner wall of a pipe according to claim 6, characterized in that, In the state where the test bar (300) does not slip, the photoelectric switch is in a closed state, and in the state where the test bar (300) slips, the photoelectric switch is in an open state.

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

9. The device for detecting the static friction coefficient of the inner wall of a pipe according to claim 4, wherein, The pipe inner wall static friction coefficient detection device further includes a bracket (800), and the speed reduction unit is connected to the lower support plate (120) through the bracket (800).

10. The inner wall static friction coefficient detection device for pipe materials according to any one of claims 4 to 9, characterized in that, The inner wall static friction coefficient detection device for the pipe also includes a horizontal detection mechanism (900), the horizontal detection mechanism (900) is arranged on the lower support plate (120) to detect the horizontal state of the lower support plate (120), and a manual adjustment switch is arranged on the motor (410).

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