An online infrared detection device for the pitch of steel wire wound around a flexible shaft

Abstract

The present invention discloses an online infrared detection device for the pitch of the outer wound steel wire of a flexible shaft, which relates to the field of pitch detection technology. The device comprises a workbench, a detector is installed above the workbench, and a detection auxiliary module is arranged above the workbench. The detection auxiliary module comprises a traction component, which adjusts the conveying state of the flexible shaft main body. The traction component comprises an upper steering wheel, which can effectively balance the traction force of the flexible shaft during transportation by means of the tensioning effect formed by the two steering positions, so that the flexible shaft can maintain a stable posture in the detection area, and the outer wound steel wire is always accurately aligned with the infrared lens to avoid depressions and protrusions of the flexible shaft due to uneven traction force, thereby ensuring the consistency of the detection benchmark; on the other hand, by simulating the bending conditions of the flexible shaft in actual use, it is verified in advance in the detection link whether the pitch error of the outer wound steel wire can be restored after being bent under force, so as to explore the potential quality risks of the product, improve the reliability of the flexible shaft in actual scenarios, and make the detection closer to the actual use needs.

Description

Technical Field

[0001] The invention relates to the technical field of pitch detection, in particular to an online infrared detection device for the pitch of a steel wire wound around a flexible shaft. Background Art

[0002] The online infrared detection device for the pitch of the outer winding steel wire of the flexible shaft can detect the pitch of the outer winding steel wire of the flexible shaft online in real time. The device uses a pulling mechanical structure to make the flexible shaft pass through the detection area, and uses infrared detection technology to accurately capture the shape of the outer winding steel wire of the flexible shaft. It detects parameters such as the pitch of 2.55±0.04 and the number of pitches per meter, thereby realizing real-time control of the quality of the flexible shaft during the production process, helping to promptly discover problems such as pitch deviation, and ensuring the quality and performance of the flexible shaft product. It is suitable for efficient quality inspection in the flexible shaft production process.

[0003] However, the existing technology still has the following defects when used in practice: 1. Compared with the existing technology that uses a linear conveying structure to detect the pitch of the steel wire wrapped around the flexible shaft, the linear conveying relies on a single driving roller to maintain the movement of the flexible shaft. When the conveying distance is extended or there are batch differences in the flexible shaft material, it is very easy to cause the flexible shaft to be unbalanced due to factors such as uneven driving force and roller friction loss; at the same time, the detection area can only meet the parameter collection of the flexible shaft in the linear state, and does not take into account the bending and turning conditions that the flexible shaft must experience in scenarios such as automobile shift cables and industrial control, resulting in the detection logic being unable to cover the core performance requirements of the product in actual use.

[0004] Unbalanced traction during linear transportation can cause radial deformation of the flexible shaft, such as local depression or overall bending. The detection area of ​​the outer winding steel wire deviates from the reference position of the infrared lens, resulting in a pitch measurement error generally exceeding ±0.15mm (precision detection requires an error of ≤±0.04mm). At the same time, since the bending condition is not simulated, hidden defects such as permanent pitch offset and loose wire layer that may occur in the outer winding steel wire after actual force cannot be discovered. The flexible shaft products using traditional linear detection have an early failure rate of up to 18% under bending conditions, of which functional failures due to insufficient pitch stability account for more than 50%, which not only causes a decrease in the control accuracy of the terminal equipment, but may also lead to safety accidents due to the failure of the flexible shaft, resulting in significant production losses and quality risks.

[0005] 2. At the same time, the existing technology lacks a method for pre-processing the surface state after bending and conveying in the pitch detection of the steel wire wrapped around the flexible shaft. In the linear conveying scenario, the tiny gaps, burrs, oil stains and other impurities on the surface of the steel wire wrapped around the flexible shaft are directly exposed to infrared detection. Traditional detection only relies on the natural reflection of the steel wire and does not introduce any optical medium to improve the reflection conditions, resulting in the detection imaging conditions being completely dependent on the original state of the flexible shaft surface. The natural reflection of the steel wire surface produces non-uniform reflection due to the spiral winding gaps and micro-undulations. The pitch contour edge captured by the infrared lens is blurred and the contrast is insufficient. At the same time, impurities such as oil stains and dust on the surface of the flexible shaft will absorb or scatter infrared light, causing imaging noise. In addition, the existing technology cannot detect the expansion of steel wire gaps or surface deformation caused by bending stress. These hidden defects will distort the pitch measurement data.

[0006] In view of this, the present invention proposes an online infrared detection device for the pitch of the steel wire wound around a flexible shaft to compensate for and improve the shortcomings of the prior art. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides an online infrared detection device for the pitch of the steel wire wound around the flexible shaft, so as to solve the technical problems raised in the above background technology.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: an online infrared detection device for the pitch of the steel wire wound around the flexible shaft, which is used to perform pitch detection processing on the flexible shaft body, including a workbench, a detector is installed above the workbench, and a detection auxiliary module is arranged above the workbench.

[0009] Furthermore, the detection auxiliary module includes a traction component, which adjusts the conveying state of the flexible shaft body. The traction component includes an upper steering wheel, an upper traction wheel, a lower steering wheel and a lower traction wheel. The flexible shaft body is sequentially attached to the outer walls of the upper steering wheel and the lower steering wheel. Through the rotation cooperation of the upper steering wheel, the upper traction wheel, the lower steering wheel and the lower traction wheel, the flexible shaft body is first transformed from an initial straight state to a vertical state for conveying, and then from a vertical state to a horizontal state for conveying, and the upper traction wheel and the lower traction wheel are respectively located on the centrifugal side of the two steering conveying of the flexible shaft body. The traction force fluctuation of the flexible shaft body is adjusted by steering to ensure that the detector and the flexible shaft body are vertically aligned.

[0010] Furthermore, the detection auxiliary module also includes a coating component, which performs surface pretreatment on the flexible shaft body. The coating component includes a coating cavity and an adsorption pad. When the flexible shaft body, which is transported in a horizontal state after turning, passes through the coating cavity, the adsorption pad will perform liquid coating treatment on the area to be detected on the surface of the flexible shaft body.

[0011] Furthermore, the flexible shaft body is divided into an inner layer and an outer layer, the inner layer steel wire is spirally wound on the inner surface of the flexible shaft center column, and the outer layer steel wire is spirally wound on the outer surface of the flexible shaft center column in the opposite direction to the inner layer steel wire.

[0012] Furthermore, the upper steering wheel and the upper traction wheel as well as the lower steering wheel and the adapting protrusion are all rotatably connected to the upper surface of the workbench, and the horizontal directions of the flexible shaft body before and after turning remain parallel.

[0013] Furthermore, the outer walls of the upper traction wheel and the lower traction wheel are fixedly connected with a plurality of adapting protrusions, the adapting protrusions are elliptical in shape as a whole and are arranged obliquely, the size of the largest part of the adapting protrusions is adapted to the pitch size of the flexible shaft body, and the flexible shaft body and the upper traction wheel and the lower traction wheel are rotatably connected through the adapting protrusions.

[0014] Furthermore, the coating chamber is movably connected to the upper surface of the workbench, the coating chamber is located on the conveying path of the flexible shaft body, and the coating chamber and the flexible shaft body are slidably connected.

[0015] Furthermore, a pull ring group is installed on the inner wall of the coating cavity, and the pull ring group is composed of an upper shaft, a lower shaft and a circular ring piece.

[0016] Furthermore, at least three adsorption pads are evenly installed on the outer wall of the upper shaft in the pull ring group, and the adsorption pads are made of porous oleophilic polyurethane sponge. A recovery bin is installed on the outer wall of the lower shaft in the pull ring group, and through grooves are evenly opened on the surface of the recovery bin, and the adsorption pads and the recovery bin are both slidably connected to the coating cavity.

[0017] Furthermore, a wiping pad and a coating chamber are symmetrically installed on the inner wall of the coating chamber. The adsorption pad, wiping pad and coating chamber are in the same horizontal plane, and the wiping pad is located at one end of the coating chamber away from the flexible shaft body, and the coating chamber is located at one end of the coating chamber close to the flexible shaft body.

[0018] Furthermore, the wiping pad is solid, and the coating chamber is hollow. A row of holes is formed on the surface of the coating chamber, and the row of holes is located between every two adjacent adsorption pads.

[0019] Furthermore, an oil storage cylinder is installed above the coating chamber, and low-viscosity silicone oil is stored inside the oil storage cylinder. Branch pipes are opened below the oil storage cylinder at positions corresponding to the adsorption pads, and the coating chamber and the oil storage cylinder are kept in communication through the branch pipes.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) This device changes the linear conveying into a "horizontal-vertical-horizontal" curved conveying. On the one hand, with the help of the tensioning effect formed by the two turns, it can effectively balance the traction force during the conveying of the flexible shaft, so that the flexible shaft can maintain a stable posture in the detection area, and the outer winding steel wire is always accurately aligned with the infrared lens to avoid the concavity and convexity of the flexible shaft due to uneven traction, thereby ensuring the consistency of the detection benchmark; on the other hand, by simulating the bending conditions of the flexible shaft in actual use, it can be verified in advance in the detection link whether the pitch error of the outer winding steel wire can be restored after being bent under force, so as to explore the potential quality risks of the product, improve the reliability of the flexible shaft in actual scenarios, and make the detection closer to the actual use needs.

[0021] In actual use, the flexible shaft body (such as automobile shift cables and industrial control flexible shafts) often bends and turns. The pitch stability of the outer winding steel wire during bending is a key performance factor. This device actively introduces a traction component to change the conveying direction of the flexible shaft, filling the gap of "online detection only measuring the straight line state". It can expose hidden dangers such as "the pitch cannot be restored after bending and the steel wire is loose" in advance. It is equivalent to adding a "simulated working condition pretreatment + detection" link at the production line end, making the factory inspection closer to actual use and avoiding the problem of "straight line inspection qualified, bending use failure".

[0022] Compared with the existing linear conveying detection method, linear conveying relies on high-precision synchronization of equipment and is prone to speed fluctuations. The double bending self-adjusts the tension at the turning point to constrain the posture error of the flexible shaft to an extremely small range, thereby improving the reliability of the detection benchmark from the structural principle. Secondly, by forcibly loading bending stress through double bending, the pitch consistency of the flexible shaft in the entire "stress deformation-recovery" process is directly verified, and hidden defects such as poor adaptability of the reverse winding of the inner and outer layers of steel wires and bending rebound failure are intercepted in advance, making the detection system closer to the actual working conditions.

[0023] (2) When the flexible shaft is actually turning, the outer winding wire will produce local stress concentration and deformation tendency due to bending. However, this device can timely apply reverse traction tension to the flexible shaft by synchronously introducing a traction wheel at a position close to the rear section of the bend and acting on the centrifugal side, thereby offsetting the additional stress caused by the bending, avoiding the problems of pitch dislocation and inter-layer slippage of the outer winding wire due to continuous bending, and maintaining the initial assembly accuracy of the spiral winding structure.

[0024] By cooperating with the upper traction wheel and the steering wheel, a "clamping-traction" constraint structure is formed at the key bending position of the flexible shaft, providing additional rigid support for the flexible shaft, allowing the flexible shaft to maintain a relatively straight and stable conveying trajectory during the steering conveying process, thereby ensuring that the structure is also suitable for long-distance and continuous conveying detection modes while achieving additional effects.

[0025] What is particularly important is that the outer walls of the upper and lower traction wheels are equipped with elliptical inclined matching protrusions, which can be accurately embedded in the pitch gap of the flexible shaft and adapt to the pitch size of the flexible shaft body. On the one hand, the traction force is transmitted through mechanical engagement to prevent the flexible shaft from slipping, stabilize the conveying trajectory, and offset the posture disturbance caused by bending; on the other hand, in the rotation coordination, the protrusion shape fits the spiral structure of the flexible shaft to simulate the force of the steel wire under actual working conditions, and accurately detect the pitch error and recoverability after bending, which not only enhances the conveying stability, but also deeply meets the pitch detection needs of the actual usage scenarios of the flexible shaft.

[0026] (3) This device introduces a coating component into the horizontal conveying path when turning to restore the horizontal direction. The device forms a liquid film by soaking the adsorption pad with special silicone oil, which can accurately act on the upper surface of the flexible shaft to be detected. Its core advantage is: using the refractive index difference between the liquid film and the outer winding steel wire to enhance the interface reflection, fill the tiny gaps and deformation fluctuations that may be generated in the steel wire after bending and turning, and convert the "non-uniform reflection" originally caused by spiral winding and bending stress into a uniform optical interface, so that the pitch contour edge captured by the infrared lens is sharper and the detection contrast is significantly improved; at the same time, the smoothing effect of the liquid film can eliminate interference sources such as burrs and oil stains on the surface of the flexible shaft during bending transportation. Combined with the simulation of the actual working conditions of the double-bending structure, it not only realizes the closed-loop verification of "bending stress-liquid film filling-infrared detection", but also actively optimizes the detection conditions through optical media.

[0027] What is particularly important is to open a row of holes between adjacent adsorption pads on the surface of the coating cavity. By releasing the local positive pressure caused by the extrusion when the flexible shaft passes through the coating cavity in real time, the pressure fluctuations in the cavity can be avoided, which may cause bubbles and uneven film thickness in the silicone oil coating, and ensure that the liquid film covers the area to be inspected of the flexible shaft with a relatively uniform thickness; a continuous and breakpoint-free liquid film is formed on the surface of the flexible shaft, avoiding misjudgment factors such as pitch contour ghosting and reflection intensity fluctuations during infrared detection due to sudden changes in air pressure.

[0028] (4) The wiping pad, adsorption pad and coating chamber are arranged horizontally and symmetrically in the coating chamber, forming an integrated functional chain of "pretreatment-coating-homogenization". The wiping pad is first used to remove impurities on the surface of the flexible shaft to prevent impurities from interfering with the optical interface between the liquid film and the steel wire; then the adsorption pad is soaked in special silicone oil to complete the initial coating and fill the gaps in the steel wire; when the flexible shaft is removed, the coating chamber eliminates bubbles and accumulation through elastic extrusion and scraping.

[0029] The pull ring group installed in the coating chamber adopts a modular combination structure of "upper shaft, circular ring piece, and lower shaft". The adsorption pad and the recovery bin can be quickly disassembled and replaced by pulling the pull ring group. This simple "pull-out maintenance" design simplifies the replacement process of the coating component to "one pull and one push", which is suitable for the continuous production scenario of the device. The modular structure ensures the long-term stability of the coating system and ensures that the liquid film coating accuracy and detection reliability are not affected by component aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main three-dimensional structure of the present invention.

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the traction assembly of the present invention.

[0032] Figure 3 It is a plan view schematically showing the positional relationship between the lower steering wheel and the lower traction wheel of the present invention.

[0033] Figure 4 It is a top cross-sectional schematic diagram of the traction assembly of the present invention.

[0034] Figure 5 It is a schematic diagram of the three-dimensional structure of the coating assembly of the present invention.

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure inside the coating chamber of the present invention.

[0036] Figure 7 This is an exploded view of the three-dimensional structure of the coating component of the present invention.

[0037] Figure 8 This is a planar schematic diagram of the positional relationship between the interior of the coating cavity and the flexible shaft body of the present invention.

[0038] Figure 9 It is a schematic diagram of the three-dimensional structure of the hole groove of the present invention.

[0039] The numbers in the figure are: 1, workbench; 11, detector; 12, flexible shaft body.

[0040] 2. Detection auxiliary module; 21. Traction assembly; 211. Upper steering wheel; 212. Upper traction wheel; 213. Lower steering wheel; 214. Lower traction wheel; 215. Adaptive bump.

[0041] 22. Coating assembly; 221. Coating chamber; 222. Pull ring assembly; 223. Adsorption pad; 224. Recovery chamber; 225. Wiping pad; 226. Coating chamber; 227. Drain hole slot; 228. Oil storage cylinder. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that the structures and working principles of the above-mentioned components such as the workbench 1, the detector 11, and the flexible shaft body 12 belong to the existing technology and will not be described in detail here.

[0044] Example 1: Please refer to Figures 1-9 As shown, an online infrared detection device for the pitch of a steel wire wound around a flexible shaft is used to perform pitch detection processing on a flexible shaft body 12, comprising a workbench 1, a detector 11 is installed above the workbench 1, and a detection auxiliary module 2 is provided above the workbench 1.

[0045] The detection auxiliary module 2 includes a traction component 21, which adjusts the conveying state of the flexible shaft body 12. The traction component 21 includes an upper steering wheel 211, an upper traction wheel 212, a lower steering wheel 213 and a lower traction wheel 214. The flexible shaft body 12 is sequentially attached to the outer walls of the upper steering wheel 211 and the lower steering wheel 213. Through the rotation cooperation of the upper steering wheel 211, the upper traction wheel 212, the lower steering wheel 213 and the lower traction wheel 214, the flexible shaft body 12 is first transformed from an initial straight state to a vertical state for conveying, and then from a vertical state to a horizontal state for conveying. The upper traction wheel 212 and the lower traction wheel 214 are respectively located on the centrifugal side of the two steering conveying of the flexible shaft body 12. The traction force fluctuation of the flexible shaft body 12 is adjusted by steering to ensure that the detector 11 and the flexible shaft body 12 are vertically aligned.

[0046] The detection auxiliary module 2 also includes a coating component 22, which performs surface pretreatment on the flexible shaft body 12. The coating component 22 includes a coating cavity 221 and an adsorption pad 223. When the flexible shaft body 12, which is transported in a horizontal state after turning, passes through the coating cavity 221, the adsorption pad 223 will perform liquid coating treatment on the surface area to be detected of the flexible shaft body 12.

[0047] Please refer to Figures 1-9 As shown, the flexible shaft body 12 is divided into an inner layer and an outer layer, the inner layer steel wire is spirally wound on the inner surface of the flexible shaft center column, and the outer layer steel wire is spirally wound on the outer surface of the flexible shaft center column in the opposite direction to the inner layer steel wire, the upper steering wheel 211 and the upper traction wheel 212 as well as the lower steering wheel 213 and the adaptation protrusion 215 are all rotatably connected to the upper surface of the workbench 1, and the horizontal directions before and after the flexible shaft body 12 turns remain parallel, and the outer walls of the upper traction wheel 212 and the lower traction wheel 214 are fixedly connected with a plurality of adaptation protrusions 215, which are elliptical in shape as a whole and are tilted. The size of the largest part of the adaptation protrusion 215 is adapted to the pitch size of the flexible shaft body 12, and the flexible shaft body 12 and the upper traction wheel 212 and the lower traction wheel 214 are all rotatably connected through the adaptation protrusion 215.

[0048] Specifically, the first turning of the flexible shaft body 12 is: horizontal → vertical, which is coordinated by the upper steering wheel 211 and the upper traction wheel 212. In the initial state, the flexible shaft body 12 is transported from left to right in a horizontal posture, close to the upper outer wall of the upper steering wheel 211, and the axis of the upper steering wheel 211 is perpendicular to the conveying direction of the flexible shaft body 12. During the normal conveying process of the flexible shaft body 12, the upper steering wheel 211 rotates clockwise, and uses friction to drive the flexible shaft body 12 to bend vertically. The curvature of the surface of the upper steering wheel 211 guides the flexible shaft to complete a ninety-degree turn and enter a vertical downward conveying state. On the centrifugal side of the curved section of the upper steering wheel 211, that is, the outer side of the flexible shaft body 12, the upper traction wheel 212 rotates counterclockwise synchronously, and the elliptical inclined adaptation protrusion 215 on its outer wall is embedded in the pitch gap of the steel wire wrapped around the flexible shaft body 12, providing reverse traction through mechanical engagement. On the one hand, this force offsets the centrifugal stress during steering and prevents the pitch deviation of the steel wire wrapped around the flexible shaft body 12 due to excessive bending. On the other hand, it forces the flexible shaft body 12 to maintain a stable posture to ensure that the conveying trajectory of the vertical section after steering is straight.

[0049] The second turn of the flexible shaft body 12: vertical → horizontal, the lower steering wheel 213 and the lower traction wheel 214 work together. In the transition state of motion, the flexible shaft body 12 is vertically transported to the lower steering wheel 213, close to the outer wall of its lower half. The axis of the lower steering wheel 213 is parallel to the upper steering wheel 211. The lower steering wheel 213 rotates counterclockwise, guiding the flexible shaft body 12 from vertical to horizontal, restoring the rightward transport state and being parallel to the initial horizontal section. On the centrifugal side of the curved section of the lower steering wheel 213, that is, on the outside of the flexible shaft body 12, the lower traction wheel 214 rotates synchronously clockwise, and the outer wall adapter convex block 215 is embedded in the pitch gap with the same mechanism to provide traction. This force balances the tension fluctuation during the turn, ensuring that the flexible shaft body 12 stably enters the horizontal detection area after the second turn, and the steel wire wrapped around the outer surface of the detection section is completely perpendicular to the lens axis of the detector 11.

[0050] The horizontal sections of the two turns remain parallel to form a "J"-shaped conveying path, so that the flexible shaft body 12 undergoes a complete "bending-recovery" process in the horizontal section after the second turn in the detection area, simulating the bending working conditions in actual use, and the traction forces of the upper traction wheel 212 and the lower traction wheel 214 act on the centrifugal side of the two turns respectively, forming a tension closed loop. When the conveying speed fluctuates and causes the front-end traction force to increase, the traction forces of the upper traction wheel 212 and the lower traction wheel 214 automatically compensate to suppress the tensile deformation of the flexible shaft body 12. Conversely, when the rear-end resistance increases, the tensioning effect prevents the flexible shaft body 12 from slacking and sagging, ensuring the stability of the posture in the detection area.

[0051] Based on Example 1, please refer to Figures 1-9As shown, the coating chamber 221 is movably connected to the upper surface of the workbench 1, the coating chamber 221 is located on the conveying path of the soft shaft body 12, and the coating chamber 221 is slidably connected to the soft shaft body 12, and the inner wall of the coating chamber 221 is installed with a pull ring group 222, and the pull ring group 222 is composed of an upper shaft, a lower shaft and a circular ring piece. The outer wall of the upper shaft in the pull ring group 222 is evenly installed with no less than three adsorption pads 223, and the adsorption pad 223 is made of a porous oleophilic polyurethane sponge. The outer wall of the lower shaft in the pull ring group 222 is installed with a recovery bin 224, and the surface of the recovery bin 224 is evenly provided with through grooves, and the adsorption pad 223 and the recovery bin 224 are both slidably connected to the coating chamber 221, and the inner wall of the coating chamber 221 is symmetrically installed with a wiping pad 225, a coating bin 2 26. The adsorption pad 223, the wiping pad 225 and the coating chamber 226 are in the same horizontal plane, and the wiping pad 225 is located at the end of the coating chamber 221 away from the flexible shaft body 12, and the coating chamber 226 is located at the end of the coating chamber 221 close to the flexible shaft body 12. The wiping pad 225 is solid, and the coating chamber 226 is hollow. A row of hole grooves 227 are opened through the surface of the coating chamber 221, and the row of hole grooves 227 are located between every two adjacent adsorption pads 223. An oil storage cylinder 228 is installed above the coating chamber 221. Low-viscosity silicone oil is stored in the oil storage cylinder 228. Branch pipes are opened at the position of the adsorption pad 223 below the oil storage cylinder 228. The coating chamber 221 and the oil storage cylinder 228 are kept in communication through the branch pipe.

[0052] The coating assembly 22, the core unit of the inspection auxiliary module 2, intervenes after the flexible shaft body 12 has returned to horizontal transport after two turns. It performs surface pretreatment through a closed-loop process of "wiping-coating-homogenizing-recovery." A coating chamber 221 is arranged along the flexible shaft's transport path. Internal components, such as the pull ring assembly 222, wiping pad 225, and coating chamber 226, work together mechanically and fluidically to form a uniform film of low-viscosity silicone oil on the surface to be inspected on the flexible shaft body 12, optimizing the optical interface for subsequent infrared detection.

[0053] Specifically, the flexible shaft body 12 enters the coating chamber 221 in a horizontal posture and first contacts the wiping pad 225. The wiping pad 225 is fixed to the inner wall of the coating chamber 221 and fits tightly with the outer surface of the flexible shaft body 12. Relative friction is generated as the flexible shaft body 12 is transported. A relative scraping effect is then generated to remove impurities on the surface of the flexible shaft body 12 and prevent impurities from interfering with the subsequent coating effect.

[0054] After passing through the wiping pad 225, the flexible shaft body 12 enters the active area of ​​the adsorption pad 223. The oil reservoir 228 continuously supplies low-viscosity silicone oil to the adsorption pad 223, keeping the porous structure of the polyurethane sponge moist through capillary action. When the adsorption pad 223 contacts the upper surface of the flexible shaft body 12, the silicone oil is squeezed out under pressure, filling the spiral gaps and microscopic undulations of the outer steel wire, forming a liquid film. The row of holes 227 between adjacent adsorption pads 223 releases the positive pressure generated by the extrusion in the cavity in real time, preventing uneven silicone oil coating due to air pressure fluctuations.

[0055] After the flexible shaft body 12 is coated by the adsorption pad 223, it contacts the coating chamber 226. The coating chamber 226 is located at the outlet end of the coating cavity 221. By applying uniform pressure to the surface of the flexible shaft body 12, excess silicone oil is scraped off and the film thickness is corrected. The homogenized liquid film forms a continuous, breakpoint-free optical interface on the surface of the flexible shaft body 12, significantly improving the uniformity of infrared reflection.

[0056] The upper shaft and the lower shaft of the pull ring group 222 are connected by a circular ring piece to form a pull-out module. When the adsorption pad 223 is blocked by impurities or fails due to aging, the staff can directly pull the pull ring group 222, remove the old adsorption pad 223 from the coating chamber 221, and replace it with a new component; the recovery bin 224 is pulled out synchronously with the lower shaft to facilitate the dumping and filtering of waste liquid. The modular design improves maintenance efficiency.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An online infrared detection device for the pitch of a steel wire wound around a flexible shaft, for performing pitch detection processing on a flexible shaft body (12), comprising a workbench (1), a detector (11) being installed above the workbench (1), and characterized in that: A detection auxiliary module (2) is provided above the workbench (1); the detection auxiliary module (2) includes a traction assembly (21), the traction assembly (21) adjusts the conveying state of the flexible shaft body (12), the traction assembly (21) includes an upper steering wheel (211), an upper traction wheel (212), a lower steering wheel (213) and a lower traction wheel (214), the flexible shaft body (12) is sequentially attached to the outer walls of the upper steering wheel (211) and the lower steering wheel (213), and through the rotational cooperation between the four, the flexible shaft body (12) is first transformed from an initial straight state to a vertical state for conveying, and then transformed from the vertical state to a horizontal state for conveying, and the upper traction wheel (212) and the lower traction wheel (214) are respectively located on the centrifugal side of the two steering conveying of the flexible shaft body (12), and the traction force fluctuation of the flexible shaft body (12) is adjusted by steering to ensure that the detector (11) and the flexible shaft body (12) are vertically aligned.

2. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 1, characterized in that: The flexible shaft body (12) is divided into an inner layer and an outer layer, wherein the inner layer steel wire is spirally wound on the inner surface of the flexible shaft center column, and the outer layer steel wire is spirally wound on the outer surface of the flexible shaft center column in the opposite direction to the inner layer steel wire.

3. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 1, characterized in that: The upper steering wheel (211), the upper traction wheel (212), the lower steering wheel (213), and the adapting protrusion (215) are all rotatably connected to the upper surface of the workbench (1), and the horizontal directions of the flexible shaft body (12) before and after turning remain parallel.

4. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 1, characterized in that: The outer walls of the upper traction wheel (212) and the lower traction wheel (214) are fixedly connected with a plurality of adapting protrusions (215); the adapting protrusions (215) are elliptical in shape and arranged obliquely; the size of the largest part of the adapting protrusions (215) is adapted to the pitch size of the flexible shaft body (12); and the flexible shaft body (12) and the upper traction wheel (212) and the lower traction wheel (214) are all rotatably connected via the adapting protrusions (215).

5. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 1, characterized in that: The detection auxiliary module (2) further comprises a coating component (22), wherein the coating component (22) performs surface pretreatment on the flexible shaft body (12), and the coating component (22) comprises a coating chamber (221) and an adsorption pad (223). When the flexible shaft body (12) transported in a horizontal state after turning passes through the coating chamber (221), the adsorption pad (223) performs liquid coating treatment on the surface area to be detected of the flexible shaft body (12). The coating chamber (221) is movably connected to the upper surface of the workbench (1), and the coating chamber (221) is located on the transport path of the flexible shaft body (12), and the coating chamber (221) and the flexible shaft body (12) are in sliding connection.

6. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 5, characterized in that: A pull ring assembly (222) is installed on the inner wall of the coating cavity (221), and the pull ring assembly (222) is composed of an upper shaft, a lower shaft, and a circular ring piece.

7. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 6, characterized in that: No less than three adsorption pads (223) are evenly installed on the outer wall of the upper shaft of the pull ring group (222), and the adsorption pads (223) are made of a porous oleophilic polyurethane sponge. A recovery bin (224) is installed on the outer wall of the lower shaft of the pull ring group (222), and a through groove is evenly opened on the surface of the recovery bin (224), and the adsorption pads (223) and the recovery bin (224) are both slidably connected to the coating cavity (221).

8. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 5, characterized in that: A wiping pad (225) and a coating chamber (226) are symmetrically mounted on the inner wall of the coating chamber (221); the adsorption pad (223), the wiping pad (225) and the coating chamber (226) are located on the same horizontal plane; the wiping pad (225) is located at an end of the coating chamber (221) away from the flexible shaft body (12); and the coating chamber (226) is located at an end of the coating chamber (221) close to the flexible shaft body (12).

9. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 8, characterized in that: The wiping pad (225) is solid, while the coating chamber (226) is hollow. A row of hole grooves (227) are provided through the surface of the coating cavity (221), and the row of hole grooves (227) are located between every two adjacent adsorption pads (223).

10. The on-line infrared detection device for the pitch of the steel wire wound around a flexible shaft according to claim 5, characterized in that: An oil storage cylinder (228) is installed above the coating chamber (221), and low-viscosity silicone oil is stored inside the oil storage cylinder (228). Branch pipes are provided below the oil storage cylinder (228) at positions corresponding to the adsorption pads (223), and the coating chamber (221) and the oil storage cylinder (228) are connected via the branch pipes.

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