Reduction gearbox kerosene leakage test tool and leakage test method

Abstract

The kerosene leakage testing tool comprises a base and a supporting frame, the base forms a U-shaped first placement position and an oil receiving disc, a bottom plate of the base is obliquely arranged and is provided with an oil drainage pipe, and a grating plate is arranged in the base to achieve both supporting and oil collection; the top of the supporting frame forms a second placing position, and bearing stability is guaranteed through multi-component reinforcement. The leakage testing method comprises a manual detection mode and an intelligent detection mode, wherein the manual detection mode realizes efficient operation through a closed-loop process of'oil injection standing at a first placement position, lifting observation at a second placement position, and returning to the first placement position for kerosene recovery '; according to the intelligent mode, the modified chalk powder formula is optimized, a flexible dual-electrode differential detection structure and a signal acquisition system are matched, electric signal changes caused by leakage are automatically captured, and accurate leakage positioning and alarming are achieved. According to the scheme, the structure is compact, the universality is high, the operation convenience and the detection accuracy are both considered, the labor cost and the leakage detection risk are reduced, and the welding seam leakage test requirements of welding parts such as marine reduction gearboxes are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tooling, in particular to a gear box kerosene leak test tooling. BACKGROUND

[0002] In the field of marine deck machinery and other heavy equipment, the weld quality of the reduction gearbox as the core transmission component directly determines the reliability of the equipment operation, and the kerosene leakage test is the mainstream process means to verify the sealing performance of the weld. The current industry uses simple and easy-to-build structures for this test, and lacks targeted integrated design, which exposes many outstanding defects in actual application. The existing tooling generally uses independently set oil collecting devices and support structures, and the oil collecting components are mostly flat or shallow groove type design, with the bottom plate arranged horizontally, which makes it difficult to quickly collect the leaked kerosene during the leak test, and easy to form residual dead angles at the bottom, not only causing waste of kerosene resources, but also causing safety hazards and environmental impact due to the evaporation of residual liquid; at the same time, the support structure is a simple support with fixed height, which can only meet the placement needs of a single size reduction gearbox, and lacks adaptability for different specifications of the gearbox, and the support point distribution is unreasonable, which can easily cause the gearbox to be unstable, and even cause slight deformation of the gearbox due to local stress concentration, affecting the accuracy of the test results.

[0003] More importantly, the existing tooling does not form an effective "oil collection-observation" station linkage, and after the reduction gearbox is coated with chalk powder and injected with kerosene, it needs to be placed on the oil collecting device, and when the weld is checked, the gearbox needs to be transferred to an independent support table through hoisting equipment, frequent hoisting not only increases the labor intensity, prolongs the test cycle, but also may cause weld damage due to the collision of the gearbox during hoisting, causing misjudgment risk. In addition, the height and structure design of the traditional support table cannot allow the tester to observe the weld comprehensively, especially the hidden welds at the bottom and sides of the gearbox, and the visual angle is limited, making it difficult to find micro-leakage traces, resulting in frequent missed detection. The formation of these defects is essentially that the existing tooling design only focuses on the implementation of a single function, without fully considering the whole process requirements of the kerosene leak test, and lacks systematic consideration of "support stability, oil collection efficiency, operation continuity, and observation comprehensiveness", resulting in poor connection between the links and fragmented functions. The direct consequence is low test efficiency, increased labor and material costs, and unqualified reduction gearboxes flowing into the market due to missed detection, which can easily cause weld leakage and gear oil leakage during actual service, not only affecting the normal operation of the equipment, but also causing equipment downtime, maintenance cost escalation and other chain problems, and in severe cases, even endangering the safety and stability of offshore operations.

[0004] In view of the above reasons, it is necessary to propose a reduction gearbox kerosene leak test tooling to solve the above problems. SUMMARY

[0005] The invention aims at overcoming the defects in the prior art and providing a speed reducer coal oil leak test tool.

[0006] To achieve the above-mentioned purpose, the technical scheme of the invention is as follows: A speed reducer coal oil leak test tool, comprising a base and a support frame, wherein the upper part of the base is vertically provided with the support frame, the base is provided with a first placement position for placing the speed reducer, and the support frame is provided with a second placement position for placing the speed reducer. The first placement position is symmetrically provided with support frames on both sides, and a containing space for containing the speed reducer is formed between the two support frames, so that the base and the two support frames form a U-shaped first placement position. The top of the two support frames forms a second placement position for supporting and placing the speed reducer. The base forms an oil receiving disc, so that the base can collect the leak detection medium during the leak test.

[0007] Further, the base comprises a frame, a grid plate and a bottom plate, the frame forms a rectangular frame, the bottom of the frame is provided with the bottom plate, the bottom plate is inclined, so that the inside of the base forms an oil receiving disc, the frame is provided with a drain pipe on the low side of the bottom plate, a plurality of grid plates are parallelly and spacedly arranged in the frame, the two ends of the grid plate are fixedly connected with the inner wall of the frame, and the bottom of the grid plate is suspendedly arranged on the upper side of the bottom plate, so that the surface of the bottom plate allows the leak detection medium to flow smoothly.

[0008] Further, the support frame comprises a vertical rod, a cross beam, a side support and an inner support frame, the support frame is provided with a vertical rod on each side of the base, a horizontal cross beam is fixedly arranged at the top of the two vertical rods, an inner support frame is arranged between the cross beam and the vertical rod, and a side support is arranged between each side of the vertical rod and the base.

[0009] Further, the heights of the cross beams at the top of the two groups of symmetrically arranged support frames are flushly arranged.

[0010] The leak detection method of the above-mentioned speed reducer coal oil leak test tool, characterized by comprising the following steps: S1: hoisting the product to be tested in the first placement position, applying chalk powder solution to the weld surface of the product to be tested, and injecting coal oil into the product to be tested after the chalk powder solution is dry; S2: standing for a period of time at the first placement position according to the predetermined test requirements; S3: after standing, transferring the product to be tested to the second placement position at a high point, and placing it at a high position to allow the inspector to visually observe the weld leakage inspection; S4: after the inspection, transferring the product to be tested to the first placement position, and releasing the coal oil in the box into the base; S5: collecting and reusing the coal oil in the base through the drain pipe.

[0011] Further, the S2 step further comprises a leak detection method for capturing the resistance change of the chalk powder by a sensor, comprising the following steps: S21: a comb-shaped electrode sheet is attached along the surface of the weld, the tooth tip of the electrode sheet is exposed and forms an electrical contact with the chalk powder, and the remaining part is encapsulated in a flexible epoxy resin material; S22: a signal acquisition circuit is constructed, the two ends of the electrode sheet are connected to the positive and negative electrodes of the power supply to form a detection loop, and a voltage and current detector and a signal amplifier are arranged on the detection loop; S23: the signal acquisition circuit transmits the detected electrical signal to the controller, and the controller continuously and automatically monitors the weld of the product to be tested; S24: when the resistance is detected to decrease, an alarm of the corresponding detection area is issued. Further, the chalk powder comprises the following components by mass fraction: chalk base powder 80-90% (ordinary chalk powder), conductive carbon black 2-8%, diatomite 5-12%, and water-soluble binder 1-4%.

[0012] Further, the water-soluble binder comprises PVA; and the chalk powder is prepared by the following process: S11, modulation: mix the raw materials according to the formula, add deionized water and stir into a paste, and the solid-liquid ratio is 1:0.8, so that the conductive carbon black and diatomite are uniformly dispersed without clumping; S12, smearing: uniformly smear on the surface of the reduction gearbox weld by spraying or brushing, and the coating thickness is controlled to be 0.5-1mm (excessive thickness will delay the kerosene penetration signal, and excessive thinness will easily cause leakage); S13, drying: natural air drying for 15-20 minutes (or low-temperature drying at 60°C for 5 minutes), so that the coating is dried before kerosene is injected (in the dry state, the resistance of the modified chalk powder is greater than or equal to 100MΩ, and the humidity is less than or equal to 5%).

[0013] Further, the comb-shaped electrode sheet adopts a double-electrode differential detection structure, which comprises a pair of independent comb-shaped electrode sheets, namely an A electrode and a B electrode, the comb teeth of the A electrode and the B electrode are arranged in a staggered manner and the interval distance between the comb teeth is 2-10mm.

[0014] The advantages and beneficial effects of the present application are as follows: 1. integrated structure, efficient and convenient operation: the "double placement position" integrated design is adopted, the base and the support frame are seamlessly connected, independent oil collecting devices and observation supports are not needed, the closed-loop process of "oil injection and standing - lifting and observation - kerosene recovery" is realized, the number of box hoisting is reduced, the labor intensity is greatly reduced, and the leak detection efficiency is improved.

[0015] 2. Complete oil recovery, energy saving and environmental protection: The design of the inclined bottom plate of the base + oil drain pipe, combined with the suspended flow guide structure of the grid plate, ensures that the kerosene is quickly gathered and recovered without residue, and cooperates with the recycling mechanism to reduce resource waste, reduce environmental pollution risk, and meet the green production demand.

[0016] 3. Stable and reliable support, strong versatility: The multi-component reinforcing structure of the support frame and the U-shaped first placement position adapt to different sizes of reduction boxes, the support points are evenly distributed, and deformation or deviation of the box body is avoided; the second placement position is designed to be elevated to expose the weld in all directions, completely solving the problem of blind area observation of hidden welds.

[0017] 4. Flexible detection mode, adapting to multiple requirements: Provide two-level modes of manual detection and intelligent detection, manual mode meets basic leak detection requirements, simple operation and low maintenance cost; intelligent mode realizes automatic identification and accurate positioning of leakage through the combination of modified chalk powder and flexible differential electrodes, greatly reduces the missed detection rate, and adapts to high-precision detection scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a reduction box kerosene leak detection tool of the present application; Figure 2 is a longitudinal sectional view of a reduction box kerosene leak detection tool of the present application; Figure 3 is a schematic diagram of a reduction box placed in the first placement position in the present application; Figure 4 is a schematic diagram of a reduction box placed in the second placement position in the present application; Figure 5 is a schematic diagram of the setting structure of the comb-shaped electrode sheet in the present application; Figure 6 is a structural schematic diagram of A-A section in the present application Figure 5 Figure: 1, base; 2, support frame; 3, first placement position; 4, second placement position; 5, surrounding frame; 6, grid plate; 7, bottom plate; 8, oil drain pipe; 9, vertical rod; 10, cross beam; 11, side support; 12, inner support frame; 13, signal acquisition circuit; 15, A electrode; 16, B electrode; 17, magnet; 18, insulating flexible packaging. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described below in conjunction with examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0020] Example 1: ​A kind of deceleration box kerosene leak detection tool, the core structure of this tool is formed by base 1 and support frame 2, forming "double placement position" layout, the core purpose of this design is to solve the problem of frequent hoisting of box caused by separation of "oil collection" and "observation" station in traditional leak detection tool, and the problem of complicated operation. Figures 1-4 As shown in Figure 1, the support frame 2 vertically arranged on the upper part of the base 1 not only bears the function of lifting the deceleration box, but also forms a U-shaped first placement position 3 with the base 1, that is, the accommodation space formed between the two side support frames 2, which can accurately fit deceleration boxes of different sizes, ensure the stability of the box when placed, and avoid kerosene leakage or blind area caused by placement deviation. The second placement position 4 formed at the top of the support frame 2 can make the detection personnel observe the weld from all angles, especially the bottom weld that is difficult to reach by traditional tool, completely solving the pain points of limited visual angle and high risk of missed detection during manual detection. This "double placement position" integrated design does not need to build an independent oil collection device and observation bracket, simplifies the tool structure, reduces the number of box hoisting, and significantly improves the continuity and efficiency of the leak detection process.

[0021] The base 1 is an oil collection component, which adopts a three-layer structure design of "frame 5-grating plate 6-bottom plate 7", which is developed around the core needs of "kerosene collection, no residue, easy recovery". The frame 5 forms a rectangular frame, which not only provides rigid support for the overall structure, but also builds a closed oil collection area to avoid kerosene leakage and environmental pollution. The bottom plate 7 is inclined, which uses gravity to naturally collect the kerosene dripping during the leak detection process along the inclined surface to the low point, solving the problem of kerosene residue in the dead angle of the horizontal bottom plate 7. The oil drain pipe 8 arranged on the low point side of the frame 5 can realize the centralized recovery of kerosene, which can be directly recycled with the external oil storage tank, reducing kerosene waste and environmental risk. The grating plate 6 is arranged in parallel and spaced in the frame 5, and its two ends are fixedly connected with the inner wall of the frame 5, and the bottom is suspended on the upper side of the bottom plate 7, which has the functions of "supporting and guiding flow". The grating plate 6 can provide a stable support surface for the deceleration box, avoiding the obstruction of kerosene flow caused by direct contact of the box with the bottom plate 7, and the suspended structure ensures smooth flow on the surface of the bottom plate 7, so that kerosene can be collected to the oil drain pipe 8 without obstruction, realizing the dual improvement of oil collection efficiency and support stability.

[0022] The support frame 2 adopts a combined structure of "vertical rod 9 - cross beam 10 - side support 11 - inner support frame 12", aiming to ensure the support reliability of the second placing position 4 through multi-dimensional reinforcement, while adapting to the elevated observation requirement of the reduction gearbox. The vertical rod 9 on both sides of the base 1 serves as the main load-bearing component, providing vertical support for the top cross beam 10; the horizontally arranged cross beam 10 is the core bearing surface of the second placing position 4, and the height of the cross beam 10 at the top of the two side supports 2 is designed to be flush, ensuring that the reduction gearbox is in a horizontal state when placed, avoiding kerosene overflow or uneven force on the weld caused by inclination, which affects the leakage detection results. The inner support frame 12 arranged between the vertical rod 9 and the cross beam 10, and the side support 11 arranged between the vertical rod 9 on both sides and the base 1, form a triangular stable structure, which disperses the weight load of the reduction gearbox by utilizing the geometric stability principle of the triangle, avoiding deformation of a single component due to concentrated force, and significantly improving the carrying capacity and service life of the support frame 2. This multi-support point and strong reinforcement structure design can adapt to the weight requirements of large welded parts such as marine reduction gearboxes, ensuring the stability of the box body during elevated observation, and providing a safe and reliable observation environment for the detector.

[0023] Based on the above structural design, the leakage detection method of embodiment one forms a closed-loop process of "placement - oiling - standing - elevated observation - recovery", each step of which is precisely adapted to the tool structure, maximizing the operation efficiency. As shown in Figure 3 , first, the reduction gearbox to be tested is hung in the first placing position 3, and the U-shaped containing space and the support surface of the grid plate 6 in this position can ensure the stability of the box body, making it convenient for the detector to evenly apply chalk powder solution to the weld surface; after the chalk powder is dried, kerosene is injected, at which time the oil collection tray function of the base 1 can collect the leaked kerosene in time, avoiding waste and pollution. After standing for a predetermined time, the box body is transferred to the second placing position 4, as shown in Figure 4 , the elevated box body exposes the welds in all directions, and the detector can complete the overall observation without bending over or moving the box body, solving the problem of difficult observation of the bottom weld in traditional tooling. After inspection, the box body is placed back in the first placing position 3 to release the kerosene, and the design of the inclined bottom plate 7 and the oil drain pipe 8 ensures that the kerosene is quickly and completely recovered, realizing efficient connection of "oil collection - observation - recovery", and the entire process does not require additional auxiliary tools, with simple and clear operation steps, greatly reducing the labor intensity.

[0024] Embodiment two: Based on the structure of embodiment one, embodiment two realizes the automation and precision of leakage detection through the combined design of "modified chalk powder + flexible differential electrode + signal acquisition system", which solves the pain points of low detection efficiency, high missed detection rate and inability to quantify leakage in traditional manual detection.

[0025] Traditional chalk powder can only realize visual recognition by color change after adsorbing kerosene, and the signal response is weak and cannot be converted into a quantifiable detection signal. The scheme optimizes the chalk powder formula, adopts the ratio of "chalk base powder 80-90% + conductive carbon black 2-8% + diatomite 5-12% + water-soluble binder 1-4%", and each component bears a key function. The chalk base powder serves as the basic carrier, ensuring the coverage of the coating and the core ability of adsorbing kerosene; the added conductive carbon black can give the chalk powder coating weak conductivity, its principle is that the conductive carbon black forms discrete conductive particles in the coating, when the coating is dry, the particle spacing is large, the coating resistance is extremely high (≥100MΩ), and after adsorbing kerosene, kerosene as a conductive medium makes the particles form a continuous conductive path, the resistance drops sharply, thereby converting the physical phenomenon of "kerosene adsorption" into a detectable electrical signal; the porous structure of diatomite can enhance the kerosene adsorption capacity of the coating, amplify the resistance change signal, and improve the detection sensitivity; the water-soluble binder (such as PVA) improves the adhesion of the coating to the weld surface, avoids falling off after drying, and ensures the integrity of the coating during detection.

[0026] To ensure the use effect of modified chalk powder, the scheme specifies the "modulation-coating-drying" standardized process: when modulating, add deionized water at a solid-liquid ratio of 1:0.8 to stir into a paste, ensuring that the conductive carbon black and diatomite are uniformly dispersed, avoiding clumping and affecting conductivity consistency; the coating thickness is controlled at 0.5-1mm, which can ensure the signal response speed after adsorbing kerosene, and avoid the problem of slow drying caused by excessive thickness or missing coating caused by too thin; the coating humidity after drying is ≤5%, ensuring that the initial resistance meets the detection requirements, providing a clear signal reference for the resistance change caused by leakage.

[0027] In view of the complex shape of the weld of the reduction gearbox, such as curved and branch welds, and the interference problem of the gearbox itself being made of conductive material, the scheme designs a "flexible double-electrode differential detection structure" comb-shaped electrode sheet to solve the above problems from the aspects of shape adaptability and anti-interference. As shown in Figure 5 、 6 The electrode sheet is made of flexible material and can bend and deform with the curved shape of the weld, and fit the surface of the curved and branch welds; and the magnets 17 arranged on both sides of the electrode sheet use magnetic force to directly adsorb the electrode sheet on the surface of the reduction gearbox, realizing quick pre-positioning without the need for additional fixing devices, which is convenient to operate and does not damage the surface of the gearbox. At the same time, the tooth tips of the electrode sheet are designed with elastic material, and the elastic force tends to press the tooth tips to fit on the surface of the weld, combined with the structural characteristics that the weld itself protrudes from the surface of the gearbox, to ensure that the tooth tips are in close contact with the modified chalk powder coating, avoiding signal distortion caused by loose fitting of the curved surface.

[0028] The double electrode differential detection structure (A electrode 15 and B electrode 16) is adopted, the comb teeth of the two electrodes are arranged in a staggered manner, the interval distance is 2-10 mm, during detection, the two ends of the electrode are connected to the positive and negative power supply respectively, and a detection loop only existing in the chalk powder coating between the two electrodes is formed. The principle of this design is that whether the reducer box body is conductive or not, the detection signal only reflects the resistance change of the coating between the two electrodes, completely cutting off the conductive path of the electrode and the box body, and avoiding the interference of the steel material conduction on the detection result. The electrode sheet is packaged in flexible epoxy resin material except the tooth tip, further strengthening the insulation effect, and ensuring the independence and stability of the detection loop.

[0029] The construction of the signal acquisition circuit 13 realizes real-time monitoring and automatic alarm of leakage, the core logic of which is to convert the coating resistance change into an electrical signal, analyze and judge through the controller, and output the result. The voltage and current detectors arranged on the detection loop are used to capture the electrical signal change between the two electrodes, and the signal amplifier amplifies the weak current signal (≤50nA when dry, ≥5mA when leaking), ensuring that the controller can accurately identify; after receiving and processing the electrical signal, the controller continuously and automatically monitors the weld, and when detecting that the resistance decreases and reaches the preset threshold, immediately issues a leakage alarm for the corresponding detection area, realizing the rapid positioning of the leakage point. With the design of the humidity sensor, the detection reliability can be further improved: only when the "resistance decrease" and "humidity increase" (the humidity of the coating after absorbing kerosene is ≥15%) are met at the same time, it is determined as a real leakage, avoiding false judgments caused by environmental humidity, coating pollution and other factors, and controlling the false judgment rate at a very low level.

[0030] The advantages of the intelligent detection scheme of the embodiment are that not only the dependence on manual observation is eliminated, the detection efficiency is greatly improved (24 hours of continuous monitoring can be realized), but also the micro leakage (≥0.1 mL / h) that is difficult for manual observation to find can be identified, and the leakage degree is quantified through the electrical signal, providing data support for the weld quality evaluation, realizing the technical breakthrough from "qualitative judgment" to "quantitative analysis".

[0031] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A kerosene leak test fixture for a gearbox, characterized in that, It includes a base and a support frame. The support frame is vertically arranged on the upper part of the base. The base has a first placement position for placing the gearbox, and the support frame has a second placement position for placing the gearbox. The first placement position is symmetrically provided with support frames on both sides, and the space between the two support frames is formed to accommodate the gearbox, so that the base and the two support frames form a U-shaped first placement position; The tops of the two side support frames form a second placement position for supporting and placing the gearbox; The base forms an oil receiving tray, allowing the base to collect the leak detection medium during the leak testing process.

2. The gearbox kerosene leak test fixture according to claim 1, characterized in that, The base includes a frame, a grid plate, and a base plate. The frame forms a rectangular frame, and the base plate is provided at the bottom of the frame. The base plate is inclined so that an oil receiving tray is formed on the inner side of the base. An oil drain pipe is provided on the lowest point side of the base plate. Several grid plates are arranged parallel to each other inside the frame. The two ends of the grid plates are fixedly connected to the inner wall of the frame. The bottom of the grid plates is suspended above the base plate so that the leak detection medium can flow smoothly on the surface of the base plate.

3. The gearbox kerosene leak test fixture according to claim 1, characterized in that, The support frame includes uprights, crossbeams, side supports, and an inner support frame. Uprights are respectively installed on both sides of the base. Horizontal crossbeams are fixedly installed on the top of the uprights on both sides. An inner support frame is provided between the crossbeams and the uprights. Side supports are respectively provided between the uprights and the base on both sides.

4. The gearbox kerosene leak test fixture according to claim 3, characterized in that, The crossbeams at the top of the two symmetrically arranged support frames are positioned at the same height.

5. A leak detection method using the gearbox kerosene leak test fixture described in claim 1, characterized in that, Includes the following steps: S1: Hang the gearbox product to be tested in the first placement position, apply chalk powder solution to the weld surface of the product to be tested, and after the chalk powder solution dries, inject kerosene into the product to be tested. S2: According to the preset test requirements, let it stand still in the first placement position for a period of time; S3: After settling, transfer the product to be tested to the second placement position at a higher point, so that the inspector can directly observe the weld leakage inspection. S4: After the inspection is completed, transfer the product to be tested to the first placement position and release the kerosene inside the box into the base. S5: Collect and reuse the kerosene in the base through the drain pipe.

6. The leak detection method of the gearbox kerosene leak test fixture according to claim 5, characterized in that, Step S2 also includes a leak detection method that uses sensors to capture changes in the resistance of chalk powder, comprising the following steps: S21: Comb-shaped electrode sheets are attached and arranged along the weld surface. The tooth tips of the electrode sheets are exposed and form electrical contact with chalk powder, while the rest are encapsulated in flexible epoxy resin material. S22: Construct a signal acquisition circuit, connect the two ends of the electrode plate to the positive and negative terminals of the power supply respectively to form a detection circuit, and set up voltage and current detectors and signal amplifiers on the detection circuit; S23: The signal acquisition circuit transmits the detected electrical signal to the controller, which then performs continuous automatic monitoring of the weld seam of the product under test. S24: When a decrease in resistance is detected, a leakage alarm is issued for the corresponding detection area.

7. The leak detection method of the gearbox kerosene leak test fixture according to claim 6, characterized in that, The chalk powder comprises the following components by mass fraction: 80-90% chalk base powder, 2-8% conductive carbon black, 5-12% diatomaceous earth, and 1-4% water-soluble binder.

8. The gearbox kerosene leak test fixture according to claim 7, characterized in that, The water-soluble binder includes PVA; the chalk powder is used in a process comprising the following steps: S11. Preparation: Mix all raw materials according to the formula, add deionized water and stir into a paste with a solid-liquid ratio of 1:0.8 to ensure that the conductive carbon black and diatomaceous earth are evenly dispersed without clumping. S12. Coating: Apply the coating evenly to the surface of the gearbox weld using a sprayer or brush, with the coating thickness controlled at 0.5-1mm. S13. Drying: Allow the coating to air dry for 15-20 minutes before injecting kerosene.

9. The leak detection method of the gearbox kerosene leak test fixture according to claim 6, characterized in that, The comb-shaped electrode sheet adopts a dual-electrode differential detection structure, which includes a pair of independent comb-shaped electrode sheets, namely electrode A and electrode B. The comb teeth of electrode A and electrode B are staggered and the spacing between the comb teeth is 2-10mm.

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