A grinding device for repairing a conical working surface of a nozzle

Abstract

The application discloses a grinding device for repairing a conical working surface of a nozzle, comprising a grinding seat and a grinding rod. The bottom of the grinding seat is provided with a sink for accommodating the disc base, the center of the sink is provided with a clearance hole with a diameter larger than the nozzle, and the upper part of the grinding seat is provided with a guide hole coaxial with the clearance hole and penetrating through the grinding seat itself. The grinding rod comprises a rod body and a grinding conical surface arranged at one end of the rod body. The sink is used for positioning and carrying the disc base, and the guide hole is in clearance fit with the rod body and is used for guiding the grinding rod to move along the axis of the grinding rod, so that the grinding conical surface is in contact with the conical working surface and grinding is conducted. Through cooperation of the sink and the clearance hole, the technical scheme realizes accurate positioning of the nozzle and avoids deviation of the nozzle in the grinding process. The clearance fit of the guide hole and the rod body of the grinding rod ensures stable movement of the grinding rod and improves grinding precision.

Description

Technical Field

[0001] This application relates to the field of maintenance tooling technology, and in particular to a grinding device for repairing the conical working surface of a nozzle. Background Technology

[0002] In aero-engine repair, the angle of the conical working surface of the nozzle plays a crucial role in the injection effect. However, during use, the nozzle's conical working surface angle may change due to high-temperature thermal corrosion, fuel erosion, carbon buildup, impact, and wear after long-term use, even resulting in angle deviations that affect injection performance. Currently, there is no dedicated equipment for grinding and repairing the nozzle's conical working surface angle in engine repair; it is mainly achieved by directly replacing the nozzle tip. However, this is not only costly but also hinders timely replacement when spare parts are unavailable, impacting production schedules.

[0003] In order to ensure product quality, improve production efficiency, and save repair costs, it is urgent to design a grinding device for repairing the conical working surface of nozzles. Utility Model Content

[0004] This application provides a grinding device for repairing the conical working surface of a nozzle, which solves the technical problem in the prior art where the conical working surface of a nozzle cannot be repaired due to the lack of a dedicated repair device. The technical solution is as follows:

[0005] The nozzle includes a disc-shaped base and a nozzle extending from one side of the disc-shaped base, the inner wall of the end of the nozzle forming a conical working surface to be repaired.

[0006] A grinding device for repairing the conical working surface of a nozzle includes: a grinding seat and a grinding rod; wherein, the bottom of the grinding seat is provided with a recess for accommodating the disc-shaped base, the center of the recess is provided with a clearance hole with a diameter larger than that of the nozzle, and the upper part of the grinding seat is provided with a guide hole coaxial with the clearance hole and penetrating through it; the grinding rod includes a rod body and a grinding conical surface disposed at one end of the rod body; the recess is used to position and support the disc-shaped base, and the guide hole is clearance-fitted with the rod body to guide the grinding rod to move along its axis, so that the grinding conical surface contacts the conical working surface.

[0007] Optionally, there are multiple grinding rods, and the grinding cone angles at the working ends of each grinding rod are different.

[0008] Optionally, the grinding cone angles of the multiple grinding rods include 20° and 30°.

[0009] Optionally, the single-sided fitting clearance between the guide hole and the body of the grinding rod is not greater than 0.05 mm.

[0010] Optionally, the grinding base is provided with an observation hole, which penetrates the grinding base radially, and its axis is perpendicular to the axis of the guide hole.

[0011] Optionally, the observation hole is configured such that when the disc-shaped base of the nozzle is installed in the settling tank, the top of the conical working surface can be observed through the observation hole.

[0012] Optionally, the bottom of the settling tank is provided with an anti-rotation structure to prevent the nozzle from rotating circumferentially.

[0013] Optionally, the depth of the settling trough is less than or equal to the thickness of the disc-shaped base, and the anti-rotation structure is an anti-rotation texture formed on the bottom of the trough, or an anti-slip pad fixedly disposed on the bottom of the trough.

[0014] Optionally, the disc-shaped base is provided with mounting holes, and the anti-rotation structure is an anti-rotation pin provided at the bottom of the settling tank, the anti-rotation pin being able to be inserted into the mounting holes of the disc-shaped base.

[0015] Optionally, the grinding rod has a knurled pattern on its shaft.

[0016] The beneficial effects of the technical solutions provided in this application include at least the following:

[0017] A grinding device for repairing the conical working surface of a nozzle includes a grinding base and a grinding rod. The bottom of the grinding base has a recess for accommodating the disc-shaped base, and the center of the recess has a clearance hole with a diameter larger than that of the nozzle. The upper part of the grinding base has a guide hole coaxial with and penetrating the clearance hole. The grinding rod includes a rod body and a grinding conical surface disposed at one end of the rod body. This technical solution achieves precise nozzle positioning through the cooperation of the recess and the clearance hole, preventing nozzle displacement during grinding. The clearance fit between the guide hole and the grinding rod body ensures stable movement of the grinding rod, improving grinding accuracy.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a 3D schematic diagram of the nozzle to be repaired;

[0021] Figure 2This is a front cross-sectional view of the nozzle to be repaired;

[0022] Figure 3 This is a three-dimensional schematic diagram of the grinding seat in the grinding device for repairing the conical working surface of a nozzle provided in the embodiments of this application;

[0023] Figure 4 This is a front cross-sectional view of the grinding seat in the grinding device for repairing the conical working surface of a nozzle provided in the embodiments of this application;

[0024] Figure 5 This is a three-dimensional schematic diagram of the grinding rod in the grinding device for repairing the conical working surface of a nozzle provided in the embodiments of this application;

[0025] Figure 6 This is an exploded view of the grinding device and nozzle for repairing the conical working surface of a nozzle provided in the embodiments of this application;

[0026] Figure 7 This is a front cross-sectional view of a nozzle being repaired using the grinding device for repairing the conical working surface of a nozzle provided in the embodiments of this application.

[0027] Explanation of reference numerals in the attached figures

[0028] 1- Nozzle; 101- Disc-shaped base; 102- Nozzle pipe; 103- Conical working surface; 104- Mounting hole; 2- Grinding seat; 201- Settling groove; 202- Clearance hole; 203- Guide hole; 204- Observation hole; 205- Anti-rotation pin; 3- Grinding rod; 301- Rod body; 302- Grinding conical surface; 4- Anti-slip pad. Detailed Implementation

[0029] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0030] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0031] refer to Figure 1 and Figure 2The nozzle 1 includes a disc-shaped base 101 and a nozzle pipe 102 extending from the base. The inner wall of the end of the nozzle pipe 102 forms a conical working surface 103 to be repaired. During use, the nozzle 1 may experience changes in the angle of the conical working surface 103 due to high-temperature thermal corrosion, fuel erosion, carbon deposits, collisions, and wear after long-term use, even resulting in angle deviations, thus affecting the injection effect. Currently, in engine repair, there is no dedicated equipment for grinding and repairing the angle of the conical working surface 103 at the nozzle pipe 102. It is mainly achieved by directly replacing the nozzle 1, which is not only costly but also cannot be replaced in a timely manner when spare parts are not available, affecting production progress.

[0032] To ensure product quality, improve production efficiency, and save repair costs, in accordance with the embodiments of this application, refer to... Figures 3 to 7 A grinding device for repairing the conical working surface of a nozzle is provided. The grinding device includes a grinding seat 2 and a grinding rod 3.

[0033] The grinding base 2 can be made of high-strength metal material, possessing sufficient rigidity and stability, as shown in the reference. Figure 4 The bottom of the grinding seat 2 is provided with a sink 201 for accommodating the disc-shaped base 101. The center of the sink 201 is provided with a relief hole 202 with a diameter larger than that of the nozzle 102. The upper part of the grinding seat 2 is provided with a guide hole 203 that is coaxial with the relief hole 202 and passes through it.

[0034] refer to Figure 5 The grinding rod 3 can be made of carbon alloy steel, which has high strength, hardness and elasticity. It includes a rod body 301 and a grinding cone surface 302 set at one end of the rod body 301. The groove 201 is used to position and support the disc-shaped base 101. The guide hole 203 is clearance-fitted with the rod body 301 to guide the grinding rod 3 to move along its axis, so that the grinding cone surface 302 contacts the conical working surface 103 for grinding.

[0035] In the above embodiment, during grinding and repair, the entire grinding device must first be placed on a flat workbench, and the grinding base 2 and grinding rod 3 must be carefully inspected for any abnormal damage to ensure that all components are in good condition. Then, the nozzle 1 to be repaired is taken. The disc-shaped base 101 of the nozzle 1 must be compatible with the size of the recess 201 at the bottom of the grinding base 2. The disc-shaped base 101 is carefully placed into the recess 201. At this time, the nozzle 1's nozzle tube 102 will naturally pass through the clearance hole 202 in the center of the recess 201. Since the diameter of the clearance hole 202 is larger than that of the nozzle tube 102, the nozzle tube 102 can extend smoothly without friction or interference with the wall of the clearance hole 202, achieving initial positioning of the nozzle 1. Next, the operator picks up the grinding rod 3, applies a layer of grinding paste evenly to its surface, and then aligns the shaft 301 of the grinding rod 3 with the guide hole 203 on the upper part of the grinding base 2, slowly inserting it into the guide hole 203. Because the guide hole 203 and the rod body 301 are in clearance fit, the grinding rod 3 can move smoothly along the axis of the guide hole 203 without obvious deviation, until the grinding cone surface 302 of the grinding rod 3 is in complete contact with the conical working surface 103 of the inner wall of the nozzle 102.

[0036] After the grinding cone surface 302 contacts the conical working surface 103, the operator holds the shaft 301 of the grinding rod 3 and rotates it at a uniform speed. The grinding cone surface 302 then performs a cutting and grinding action on the conical working surface 103. During the grinding process, the guide hole 203 continuously provides precise guidance for the grinding rod 3, ensuring that the grinding rod 3 always rotates along the axis and preventing the contact position between the grinding cone surface 302 and the conical working surface 103 from shifting. This ensures that the grinding amount is uniform in all circumferential directions and at all heights of the conical working surface 103. After grinding for a period of time, the rotation of the grinding rod 3 is stopped, and it is removed from the guide hole 203. Then, the nozzle 1 is removed, and an angle detection tool is used to check whether the angle of the conical working surface 103 falls within the acceptable range. If the angle is not acceptable, the nozzle 1 needs to be repositioned in the groove 201, and grinding paste is applied to the grinding cone surface 302 of the grinding rod 3 again and inserted into the guide hole 203. The above rotational grinding steps are repeated until the angle of the conical working surface 103 of the nozzle 1 is acceptable.

[0037] This technical solution achieves precise positioning of the nozzle 1 through the cooperation of the countersink 201 and the clearance hole 202, preventing the nozzle 1 from shifting during the grinding process. The clearance fit between the guide hole 203 and the grinding rod 3 body 301 ensures the stable movement of the grinding rod 3, improving grinding accuracy. Furthermore, the grinding rod 3 is made of carbon alloy steel, which has high strength and hardness, can withstand the cutting forces during the grinding process, and is not easily deformed or worn, extending the service life of the device. The high-strength metal material of the grinding seat 2 ensures the stability of the overall structure, preventing damage to the device due to forces during the grinding process, further improving the reliability of the grinding operation.

[0038] According to an embodiment of this application, there are multiple grinding rods 3, and the angles of the grinding cone surfaces 302 at the working ends of each grinding rod 3 are different. During operation, an angle detection tool is used to measure the initial angle of the conical working surface 103 of the nozzle 1 to be repaired. Based on the deviation between the initial angle and the acceptable range, a grinding rod 3 with a suitable angle is selected. After determining the suitable grinding rod 3, grinding is performed according to the grinding steps described above.

[0039] The use of multiple grinding rods 3 at different angles precisely adapts to the repair needs of nozzles 1 with varying angle deviations, avoiding the problems of low grinding efficiency or repair failure caused by a single grinding rod 3 being unable to meet multiple out-of-tolerance conditions. For nozzles 1 with large angle deviations, the angle can be gradually adjusted by replacing grinding rods 3 with different angles, reducing the cutting amount in a single grinding and avoiding damage to the conical working surface 103 due to over-grinding. For nozzles 1 with small angle deviations, a grinding rod 3 with an angle close to the acceptable level can be directly selected for fine grinding, shortening the grinding time. This design not only improves the flexibility and accuracy of grinding operations but also effectively protects nozzles 1 and grinding rods 3, extending their service life. Furthermore, it increases the pass rate of nozzle 1 repair, ensuring that the repaired nozzles 1 meet the stringent requirements of aero-engines for fuel injection angles, thus guaranteeing engine combustion efficiency and power performance.

[0040] According to the embodiments of this application, refer to Figure 7 Optionally, the grinding cone surface 302 angles of the multiple grinding rods 3 include 20° and 30°. The grinding cone surface 302 angles of 20° and 30° cover the common out-of-tolerance range of the conical working surface 103 of the working nozzle 1, eliminating the need to design grinding rods 3 with other angles, simplifying the overall structure of the device and reducing manufacturing costs.

[0041] According to an embodiment of this application, optionally, the single-sided fitting clearance between the guide hole 203 and the rod body 301 of the grinding rod 3 is no greater than 0.05mm. Since the single-sided fitting clearance is no greater than 0.05mm, the rod body 301 moves within the guide hole 203 without significant shaking, allowing it to move precisely down along the axis of the guide hole 203. This avoids the rod body 301 shifting due to excessive clearance, ensuring that the contact position between the grinding cone surface 302 and the conical working surface 103 meets the preset requirements. When the grinding cone surface 302 is in complete contact with the conical working surface 103, the operator begins to rotate the grinding rod 3. At this time, the extremely small fitting clearance strictly limits the radial displacement of the grinding rod 3. Even if subjected to a slight lateral force during rotation, the radial displacement of the grinding rod 3 will be controlled within 0.05mm, ensuring that the grinding cone surface 302 always maintains a stable contact pressure and contact area with the conical working surface 103.

[0042] The small gap design between the guide hole 203 and the rod body 301 effectively improves grinding precision and avoids over- or under-grinding of the conical working surface 103 due to rod body 301 misalignment. Simultaneously, the small gap reduces frictional loss between the grinding rod 3 and the guide hole 203, as shaking exacerbates contact friction, while smooth movement keeps the friction coefficient stable, extending the service life of the guide hole 203 and the grinding rod 3, and reducing equipment maintenance costs. Furthermore, stable rod body 301 movement reduces vibration during the grinding process, lowers the operator's workload, and makes the rotary grinding action smoother, preventing grinding paste from falling off or the grinding trajectory from becoming disordered due to vibration. This further improves the stability of repair quality, ensuring that the repaired nozzle 1 meets the stringent requirements of aero-engines for fuel injection angle, guaranteeing engine combustion efficiency and power performance, and reducing fuel waste and pollutant emissions.

[0043] According to the embodiments of this application, refer to Figure 3 and Figure 4 Optionally, the grinding base 2 is provided with an observation hole 204, which penetrates the grinding base 2 radially, and its axis is perpendicular to the axis of the guide hole 203.

[0044] During grinding, because the observation hole 204 penetrates the grinding seat 2 radially and its axis is perpendicular to the axis of the guide hole 203, the operator can clearly see the contact area between the grinding cone surface 302 and the conical working surface 103 below the guide hole 203. During the grinding process with the rotating grinding rod 3, the distribution of the grinding paste can be monitored in real time through the observation hole 204: if the grinding paste in a certain area is found to be almost completely used up, showing signs of dry grinding, rotation can be stopped immediately, and a small cotton swab dipped in grinding paste can be inserted through the observation hole 204 to replenish the paste and apply it to that area, avoiding damage to the conical working surface 103 or the grinding cone surface 302 due to dry grinding. Simultaneously, the grinding progress of the conical working surface 103 can also be observed through the observation hole 204, such as observing changes in the surface roughness of the conical working surface 103 and determining whether grinding is complete; furthermore, the degree of contact between the grinding cone surface 302 and the conical working surface 103 can be observed. If there is a significant gap between the two, it indicates that the grinding rod 3 is not inserted deep enough, and the grinding rod 3 needs to be moved further downwards to ensure a tight fit.

[0045] The observation port 204 enables visualization of the grinding process, avoiding the need for frequent removal of nozzle 1 to check the grinding progress in traditional devices without an observation port 204. This reduces operational steps and improves work efficiency. This solution allows for real-time monitoring via the observation port 204, enabling continuous grinding until near-qualified before removal for inspection. Simultaneously, real-time observation can promptly detect grinding anomalies such as dry grinding, poor adhesion, or foreign object jamming, preventing damage to the working surface or device malfunctions caused by these issues and reducing the risk of repair failure. Furthermore, the observation port 204 helps operators more precisely control grinding time, avoiding over-grinding. For example, when the working surface is observed to be smooth, grinding can be stopped promptly, effectively preventing the angle of the conical working surface 103 from becoming too small due to over-grinding, further improving repair accuracy. This visualization design also reduces the operator's workload, eliminating the need for frequent bending or disassembly of the device to monitor the grinding progress, improving operational comfort. Especially when repairing nozzles 1 in batches, it significantly improves overall work efficiency, ensuring that each repaired nozzle 1 meets quality requirements, thus guaranteeing the safe and stable operation of the aero-engine.

[0046] According to the embodiments of this application, refer to Figure 3 and Figure 4 Optionally, the observation hole 204 is configured such that when the disc-shaped base 101 of the nozzle 1 is installed in the sink 201, the top of the conical working surface (103) can be observed through the observation hole 204.

[0047] With this design, operators can clearly see the top of the conical working surface 103 by looking through the observation hole 204. Through fully visualized grinding process control, the repaired nozzle 1 conical working surface 103 has higher angular accuracy, better meeting the requirements of aero-engines, ensuring fuel injection performance, and reducing the risk of engine failure. The observation hole 204 also allows for timely removal of grinding debris.

[0048] According to an embodiment of this application, optionally, an anti-rotation structure is provided at the bottom of the settling tank 201 to prevent the nozzle 1 from rotating circumferentially. The anti-rotation structure ensures the stability of the nozzle 1 during the grinding process, avoiding grinding failure or uneven grinding caused by the circumferential rotation of the nozzle 1, significantly improving grinding efficiency and repair quality. Simultaneously, the stable position of the nozzle 1 prevents frictional collisions between the nozzle pipe 102 and the clearance hole 202, protecting the nozzle 1 and the grinding seat 2 from damage and extending their service life. Furthermore, the anti-rotation structure reduces the vibration of the nozzle 1 during grinding, making the contact pressure between the grinding cone surface 302 and the working surface more uniform, further improving grinding accuracy, ensuring that the repaired nozzle 1 meets the requirements of aero-engine use, guaranteeing fuel injection performance, reducing engine failure risk, and reducing maintenance costs and downtime.

[0049] According to the embodiments of this application, refer to Figure 6 and Figure 7 This technical solution refines the depth of the settling tank 201 and the anti-rotation structure. Specifically, the depth of the settling tank 201 is less than or equal to the thickness of the disc-shaped base 101, and the anti-rotation structure is an anti-rotation texture formed on the bottom of the tank or an anti-slip pad 4 fixedly installed on the bottom of the tank.

[0050] Anti-rotation patterns can be machined into the bottom of the recess 201 of the grinding base 2 using a carving tool, forming a stable anti-rotation effect on the grinding base 2. Even under high grinding torque, the anti-rotation patterns ensure that the nozzle 1 does not rotate. The reasonable design of the depth of the recess 201 balances positioning stability and ease of operation, avoiding the problems of difficulty in removing the nozzle 1 due to an excessively deep recess 201, or instability in positioning due to an excessively shallow recess 201, further improving work efficiency.

[0051] The anti-slip pad 4 is low in cost and easy to install and replace. If the anti-slip pad 4 is worn, only the new anti-slip pad 4 needs to be replaced. There is no need to repair the grinding seat 2 as a whole, which reduces maintenance costs.

[0052] Both the anti-rotation texture and the anti-slip pad 4 can effectively prevent the nozzle 1 from rotating circumferentially, ensuring grinding accuracy; the reasonable design of the depth of the settling tank 201 improves the ease of operation.

[0053] According to the embodiments of this application, refer to Figure 1 and Figure 2 In some cases, the disc-shaped base 101 is provided with mounting holes 104, see reference. Figure 3 and Figure 4 The anti-rotation structure is an anti-rotation pin 205 located at the bottom of the settling tank 201, and the anti-rotation pin 205 can be inserted into the mounting hole 104 of the disc-shaped base 101.

[0054] During grinding, hold both sides of the disc-shaped base 101 of nozzle 1, precisely align the mounting hole 104 with the anti-rotation pin 205, and slowly move nozzle 1 downwards so that the anti-rotation pin 205 gradually inserts into the mounting hole 104. When the bottom of the disc-shaped base 101 is in complete contact with the bottom of the settling tank 201, the anti-rotation pin 205 has been fully inserted into the mounting hole 104. At this time, gently try to rotate nozzle 1 clockwise and counterclockwise by hand. Due to the rigid constraint of the anti-rotation pin 205, nozzle 1 cannot rotate around its own axis, achieving stable circumferential positioning. At the same time, the radial limiting effect of the settling tank 201 also ensures that nozzle 1 will not deviate.

[0055] The rigid fit between the anti-rotation pin 205 and the mounting hole 104 achieves absolute circumferential positioning of the nozzle 1. Compared with the frictional anti-rotation method using the anti-slip pad 4 or anti-rotation texture, the anti-rotation effect is more stable and reliable. Even under a large grinding torque, it can completely prevent the nozzle 1 from rotating, significantly improving grinding accuracy and making the angular error of the conical working surface 103 more controllable. Meanwhile, the anti-rotation pin 205 is simple to design and easy to manufacture, and can be integrally formed with the grinding seat 2, resulting in high structural stability, resistance to damage, and a long service life. The mounting hole 104 on the disc-shaped base 101 is usually part of the original structure of the nozzle 1, eliminating the need to machine new holes on the nozzle 1, avoiding damage to the original structure of the nozzle 1, and reducing the risk of damage to the nozzle 1. Furthermore, the precise positioning of the fit between the anti-rotation pin 205 and the mounting hole 104 ensures that the circumferential and radial positions of the nozzle 1 remain consistent each time it is installed. This is suitable for batch repair of nozzles 1, ensuring consistent repair quality across multiple batches of nozzles 1 and improving overall work efficiency.

[0056] refer to Figures 1 to 7 The working principle of the grinding device used in this application for repairing the conical working surface of the nozzle will be explained below with reference to specific nozzle grinding and repair steps.

[0057] The grinding device includes multiple grinding rods 3 and a grinding base 2. The grinding rods 3 contain 20° and 30° grinding conical surfaces 302, made of carbon alloy steel. The grinding base 2 is made of high-strength metal, with a recessed groove 201 at the bottom, a clearance hole 202 in the center, and a guide hole 203 at the top. The clearance between the grinding rod 3 and the rod body 301 on one side is ≤0.05mm. An observation hole 204 is provided on the side wall, and the radial cross-sectional projection of the conical working surface 103 completely falls within the projection range of the observation hole 204. An anti-rotation pin 205 is provided at the bottom of the recessed groove 201. The nozzle 1 is an integrated structure of a disc-shaped base 101 with a mounting hole 104 and a nozzle pipe 102. The inner wall of the nozzle pipe 102's end is a conical working surface 103. The specific implementation steps are as follows:

[0058] Step 1: Use an angle meter to initially detect the initial angle of the conical working surface 103 of nozzle 1, and select the appropriate grinding rod 3 according to the angle deviation.

[0059] Step 2: Place the grinding device on a level and flat workbench. Check that the inner walls of the clearance hole 202 and the guide hole 203 are clean and free of burrs. Use a feeler gauge to check the single-sided fit clearance between the guide hole 203 and the grinding rod 3 body 301 to ensure it is ≤0.05mm. Check that the observation hole 204 is clean and transparent, free of debris, and that the projection range of the observation hole 204 covers the radial section of the conical working surface 103.

[0060] Step 3: Hold the disc-shaped base 101 of nozzle 1 with both hands, and accurately align the mounting hole 104 on the disc-shaped base 101 with the anti-rotation pin 205 at the bottom of the grinding seat 2 sink 201. Slowly move nozzle 1 downwards so that the anti-rotation pin 205 is fully inserted into the mounting hole 104 until the bottom of the disc-shaped base 101 is tightly fitted with the bottom of the sink 201. Rotate nozzle 1 to confirm that nozzle 1 cannot rotate.

[0061] Step 4: Apply a layer of polishing paste evenly to the polishing cone surface 302 of the selected polishing rod 3, ensuring that it covers all areas of the cone surface, especially the edges and corners.

[0062] Step 5: Hold the rod body 301 of the grinding rod 3 with your hand, align the rod body 301 with the guide hole 203 on the upper part of the grinding seat 2, slowly insert it into the guide hole 203, and move it down smoothly along the axis of the guide hole 203 until the grinding cone surface 302 is in complete contact with the conical working surface 103.

[0063] Step Six: The operator stands on the side of the grinding seat 2 with the observation hole 204, and looks into the observation hole 204 to ensure that the contact area between the conical working surface 103 and the grinding cone surface 302 can be clearly seen. The grinding rod 3 is rotated at a uniform speed of 30-40 revolutions per minute. During the rotation, the distribution of grinding paste, grinding progress and contact status are monitored in real time through the observation hole 204.

[0064] Step 7: Continue grinding for the specified time. During this period, check the grinding status through the observation hole 204 to avoid over-grinding.

[0065] Step 8: Stop rotating the grinding rod 3 and remove it from the guide hole 203. Wipe the remaining grinding paste on the rod body 301 and the grinding cone surface 302 with a cleaning cloth, and check whether the grinding cone surface 302 is intact. Hold the disc-shaped base 101 of the nozzle 1 with both hands and gently lift it upwards to dislodge the anti-rotation pin 205 from the mounting hole 104, removing all grinding paste residue. Use a high-precision angle gauge to check the angle of the conical working surface 103. If the angle is within the acceptable range, the repair is complete. Place the nozzle 1 into the qualified product storage box. If the angle is still out of tolerance, reinstall the nozzle 1, add grinding paste, and continue grinding until the angle is within the acceptable range.

[0066] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0067] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0068] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A grinding apparatus for repairing a conical working surface of a nozzle, the nozzle (1) comprising a disc-shaped base (101) and a nozzle pipe (102) extending from one side of the disc-shaped base (101), the inner wall of the end of the nozzle pipe (102) forming the conical working surface (103) to be repaired, characterized in that, The grinding apparatus includes: The grinding base (2) has a groove (201) at its bottom for accommodating the disc-shaped base (101), and a relief hole (202) with a diameter larger than that of the nozzle (102) is provided at the center of the groove (201). The upper part of the grinding base (2) has a guide hole (203) that is coaxial with the relief hole (202) and passes through it. The grinding rod (3) includes a rod body (301) and a grinding cone surface (302) disposed at one end of the rod body (301). The groove (201) is used to position and support the disc-shaped base (101), and the guide hole (203) is in clearance fit with the rod body (301) to guide the grinding rod (3) to move along its axis so that the grinding cone surface (302) contacts the conical working surface (103).

2. The grinding device for repairing the conical working surface of a nozzle according to claim 1, characterized in that, The number of grinding rods (3) is multiple, and the angle of the grinding cone surface (302) at the working end of each grinding rod (3) is different.

3. The grinding device for repairing the conical working surface of a nozzle according to claim 2, characterized in that, The grinding cones (302) of the multiple grinding rods (3) have angles of 20° and 30°.

4. The grinding device for repairing the conical working surface of a nozzle according to claim 1, characterized in that, The single-sided fitting gap between the guide hole (203) and the rod body (301) of the grinding rod (3) is no greater than 0.05mm.

5. The grinding device for repairing the conical working surface of a nozzle according to claim 1, characterized in that, The grinding base (2) is provided with an observation hole (204), which penetrates the grinding base (2) radially, and its axis is perpendicular to the axis of the guide hole (203).

6. The grinding apparatus for repairing the conical working surface of a nozzle according to claim 5, characterized in that, The observation hole (204) is configured such that when the disc-shaped base (101) of the nozzle (1) is installed in the sink (201), the top of the conical working surface (103) can be observed through the observation hole (204).

7. The grinding device for repairing the conical working surface of a nozzle according to claim 1, characterized in that, The bottom of the settling tank (201) is provided with an anti-rotation structure to prevent the nozzle (1) from rotating circumferentially.

8. The grinding apparatus for repairing the conical working surface of a nozzle according to claim 7, characterized in that, The depth of the settling trough (201) is less than or equal to the thickness of the disc-shaped base (101), and the anti-rotation structure is an anti-rotation texture formed on the bottom of the trough, or an anti-slip pad (4) fixedly installed on the bottom of the trough.

9. The grinding apparatus for repairing the conical working surface of a nozzle according to claim 7, characterized in that, The disc-shaped base (101) is provided with mounting holes (104), and the anti-rotation structure is an anti-rotation pin (205) provided at the bottom of the settling tank (201). The anti-rotation pin (205) can be inserted into the mounting holes (104) of the disc-shaped base (101).

10. The grinding apparatus for repairing the conical working surface of a nozzle according to claim 1, characterized in that, The grinding rod (3) has a knurled pattern on its shaft (301).

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