Method of inspecting a mechanism door and use thereof

Abstract

The application discloses a kind of mechanism door inspection method and its application, through upper slide frame inspection, thrust frame inspection, reset spring performance detection, lever rocker detection, drive frame detection and repair etc. System standardization method can effectively improve the detection accuracy and detection efficiency of industrial slide type mechanism door, avoid artificial detection missed detection, misdiagnosis problem, realize standardized, repeatable high-quality maintenance, reduce human error, clear replacement standard, improve maintenance quality and equipment service life, suitable for mechanism door maintenance in harsh environment such as high temperature, high pressure, overcome the deficiency that existing mechanism door maintenance process relies on artificial experience, lacks systematic detection and assembly standard, prone to error and security risk.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly and maintenance technology, specifically relating to a method for inspecting a mechanism door and its application. Background Technology

[0002] Currently, industrial mechanical doors (such as sliding doors used in high-temperature and high-pressure environments) are prone to problems such as frame deformation, component wear, and assembly errors during long-term use, affecting their sealing performance, service life, and operational safety. Existing traditional maintenance methods for industrial mechanical doors rely on manual experience, which is prone to errors and safety hazards. They also lack systematic testing standards and assembly procedures, resulting in inconsistent maintenance quality and problems such as missed inspections and incorrect installations. Summary of the Invention

[0003] The purpose of this invention is to provide a method for inspecting a mechanism door and its application, so as to solve the problems mentioned in the background art.

[0004] The objective of this invention is achieved through the following technical solution: a method for inspecting a mechanism door, comprising the following steps;

[0005] S1. Upper slide frame inspection: Inspect the frame surface to check for cracks, burns, and plastic deformation defects; use a flat ruler and feeler gauge to check the overall flatness error of the frame; use a high-precision aperture ruler to measure the diameter of the frame positioning pin holes to determine if the wear exceeds the standard; use an outside caliper to check the diameter of the closing pin to determine if the wear has failed.

[0006] S2. Thrust Frame Inspection: Use an inside micrometer to check the inner diameter of the copper sleeve on both sides of the thrust frame. If the inner diameter of the copper sleeve on the fixed pin side is greater than 42mm and the inner diameter of the copper sleeve on the closing pin side is greater than 47mm, the copper sleeve is considered to be worn beyond the standard and needs to be replaced. Use a feeler gauge to check the assembly clearance between the lever shaft and the mating groove. If the clearance is greater than 1mm, the fit is considered to be loose and the corresponding parts need to be repaired or replaced.

[0007] S3. Return Spring Performance Testing: The return spring of the mechanism door is tested for pressure load using a spring pressure tester. The acceptable range for spring pressure is 3.3KN–4.53KN. When the spring pressure meets the condition of 3.3KN ≤ pressure ≤ 4.53KN, it is considered qualified and can continue to be used. When the spring pressure is < 3.3KN, it is determined that the spring has fatigue failure and severe elasticity attenuation, and it should be scrapped and strictly prohibited from being used again. When the pressure value is higher than 4.53KN, it is determined that the stiffness is abnormal.

[0008] S4. Lever rocker arm inspection: Thoroughly clean the rocker arm components to remove surface oil, dust, rust, and other impurities. Inspect the body to check for cracks, wear, deformation, and scoring defects. Use high-precision calipers to quantitatively inspect the key dimensions of the rocker arm: Measure the width H of the rocker arm head. If the width H < 46mm, the wear is considered excessive, and a new spare part is required. Measure the assembly diameter on both sides of the rocker arm shaft. If the measured shaft diameter is < 20mm, the pin shaft is considered worn and ineffective, and a new spare part is required. For qualified rockers, they can be put into normal use or kept as spares. After passing the inspection, apply a layer of high-temperature lubricating oil evenly to the surface of the rocker arm, shaft, and assembly contact surfaces to complete the protective maintenance.

[0009] S5. Drive Frame Inspection and Repair: Thoroughly clean the drive moving frame to remove impurities and oil stains from the sliding surface, mating groove, and side walls; after cleaning, conduct a comprehensive inspection of the frame body to check for burrs, cracks, twisting deformation, localized scratches, and structural defects; minor scratches on the side of the drive frame are considered normal signs of use and must not be polished to avoid damaging the original assembly tolerances and mating surface precision.

[0010] The overall width 'a' of the drive frame is measured using a high-precision vernier caliper. The acceptable size range is: 336mm < a < 340mm. If the measured width 'a' exceeds this acceptable range, the drive frame must be corrected and repaired to bring the size back to the original design reference size 'a' = 339 ± 0.25mm.

[0011] S6. Underboard frame inspection: Select brand new standard underboard parts for trial assembly inspection. Place the new underboard completely into the underboard cavity to verify whether it can be fully and snugly installed. If the underboard shakes or moves around in the cavity after trial assembly, it is determined that the cavity fit accuracy is abnormal. First, thoroughly clean the underboard cavity to completely remove burrs, protrusions, residual debris, dust, oil stains and other foreign objects from the inner wall of the cavity.

[0012] S7. Horseshoe Inspection: Thoroughly clean the entire horseshoe, guide rod, eccentric wheel, eccentric wheel chamber, T-nut and connecting bolts to completely remove surface oil, carbon deposits, dust, rust particles and wear debris, ensuring that there are no foreign objects interfering with the inspection contact surface and ensuring inspection accuracy.

[0013] After cleaning, place the horseshoe flat on the standard testing platform and use a high-precision vernier caliper to measure the width dimension X of the horseshoe. If the measured X value is greater than 234mm, it is determined that the horseshoe is worn overall and the structural dimensions are out of standard, and a brand new spare part should be replaced.

[0014] Furthermore, in step S1, a flat ruler and feeler gauge are used to check the overall flatness of the frame. If the flatness error exceeds 0.6mm, it is deemed unqualified and the component needs to be replaced.

[0015] A high-precision aperture ruler was used to measure the hole diameter of the frame positioning pins. If the hole diameter exceeded 42mm, it was determined that the wear was excessive and the pins needed to be replaced.

[0016] The diameter of the closing pin is measured using an outside caliper. If the diameter is less than 38mm, it is determined to be worn and in failure, and the part needs to be replaced.

[0017] Furthermore, in step S2, a horizontal ruler combined with a 2mm standard feeler gauge is used to perform bidirectional planar measurement of the thrust frame: the horizontal ruler is arranged along the direction parallel to the hydraulic cylinder axis, and a 2mm feeler gauge is inserted into the contact gap between the horizontal ruler and the frame. If the feeler gauge can pass through smoothly, it is determined that the flatness of the frame exceeds the standard and the deformation fails, and the spare parts need to be replaced.

[0018] Arrange a level again along the direction perpendicular to the hydraulic cylinder axis, and repeat the 2mm feeler gauge test. If the feeler gauge passes through, it is considered unqualified and a spare part needs to be replaced. If the flatness of the frame fails in either direction during the bidirectional flatness test, the component is directly considered to be faulty and needs to be replaced. After completing all the test items of the thrust frame, apply a layer of high-temperature lubricating oil evenly to the contact surface between the inner wall of the bushing and the rocker chamber to complete the protective maintenance treatment.

[0019] Furthermore, it is normal for there to be scratches on the side of the drive frame in step S5. Do not polish them. Measure its flatness according to the following steps: Perform a flatness test on the drive frame in the axial direction: Set up a level parallel to the axis of the moving frame, and insert a 2mm standard feeler gauge into the gap between the level and the frame. If the 2mm feeler gauge can pass through smoothly, it is determined that the flatness of the frame exceeds the standard and deformation has occurred. The moving frame needs to be leveled and corrected. If the moving frame cannot be leveled manually, it should be replaced with a new one.

[0020] Furthermore, in step S5, the inner diameter d of the drive frame U-shaped fork is detected. If the measured diameter d > 38 mm, it is determined that the wear and expansion of the U-shaped fork mating hole exceeds the standard. It needs to be corrected and repaired to the original reference size d = 36 mm. If it cannot be repaired, a brand new spare part is directly replaced.

[0021] After completing all dimensional, geometric, and visual inspections and repairs of the drive frame, apply a layer of high-temperature lubricating oil evenly to all sliding surfaces of the drive frame to reduce sliding friction and prevent rust and abnormal wear.

[0022] Furthermore, after completing the chamber cleaning operation in step S6, a quantitative inspection of the diagonal plane of the sliding plate chamber is performed: a 400mm standard length flat ruler and a 0.6mm fixed value feeler gauge are used for double diagonal inspection. First, the flat ruler is placed close to the first diagonal direction of the chamber, and a 0.6mm feeler gauge is inserted into the gap between the flat ruler and the chamber contact surface. Then, the above inspection operation is repeated on the other diagonal direction.

[0023] If a 0.6mm feeler gauge can be easily inserted into any diagonal testing position, it is determined that the flatness deformation of the lower slide cavity exceeds the standard and the precision of the mating surface fails. The cavity plane needs to be corrected and repaired. If it cannot be repaired, the entire lower slide frame spare part should be replaced directly.

[0024] Furthermore, in step S7, the flatness of the horseshoe is tested on a standard testing platform: a 1mm standard fixed-value feeler gauge is used to test the gap between the horseshoe and the platform support surface. If the 1mm feeler gauge can be easily inserted into the gap between the horseshoe and the platform, it is determined that the flatness deformation of the horseshoe exceeds the standard and the support surface is warped and failed. The spare part needs to be replaced directly. At the same time, the support surface of the horseshoe slide is checked. If there are unevenness, scratches, chipped edges, or structural damage, it is directly determined to be failed and replaced.

[0025] When the wear depth of the eccentric wheel contact surface of the horseshoe is measured to exceed 1mm, it is determined that the wear of the eccentric wheel mating surface is severe and the transmission fit accuracy is failed. The entire horseshoe and matching guide rod assembly should be replaced with brand new ones.

[0026] Furthermore, in step S7, a straightness bending test is performed on the horseshoe guide rod: the guide rod is placed on a standard test plane, and the longitudinal corresponding parameters X1 and X2 at both ends of the guide rod are obtained through multi-point measurement. The difference between X1 and X2 is calculated. The judgment standard is: if the difference between X1 and X2 is <0.5mm, it is qualified. If the difference is ≥0.5mm, it is determined that the guide rod has bent and deformed, and the straightness exceeds the standard. The sliding guidance accuracy cannot be guaranteed, and a brand new spare part must be replaced.

[0027] An inspection method for mechanical doors is applied to the systematic inspection, measurement, and assembly of sliding doors in high-temperature and high-pressure environments, thereby achieving a standardized assembly process.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] This invention provides a systematic method for inspecting and assembling mechanism doors, achieving standardized and repeatable high-quality maintenance, reducing human error, clarifying replacement standards, improving maintenance quality and equipment lifespan, and is applicable to mechanism door maintenance in harsh environments such as high temperature and high pressure. It overcomes the shortcomings of existing mechanism door maintenance processes, which rely on manual experience, lack systematic testing and assembly standards, and are prone to errors and safety hazards. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the closing pin of the present invention;

[0031] Figure 2 This is a schematic diagram of the spring chamber of the present invention;

[0032] Figure 3 This is a three-dimensional schematic diagram of the joystick of the present invention;

[0033] Figure 4 This is the present invention. Figure 3 Cross-sectional diagram;

[0034] Figure 5 This is a schematic diagram of the driving framework of the present invention;

[0035] Figure 6 This is a schematic diagram of the lower sliding plate frame of the present invention;

[0036] Figure 7 This is a schematic diagram of the sliding frame of the present invention having a sliding bar;

[0037] Figure 8 This is a schematic diagram of the horseshoe of the present invention;

[0038] Figure 9 This is a schematic diagram of the horseshoe guide rod of the present invention. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Specific Implementation Example 1

[0043] like Figure 1-9 As shown, a method for inspecting a mechanism door includes the following steps;

[0044] S1. Upper slide frame inspection: Inspect the frame surface to check for cracks, burns, and plastic deformation defects; use a flat ruler and feeler gauge to check the overall flatness error of the frame; use a high-precision aperture ruler to measure the diameter of the frame positioning pin holes to determine if the wear exceeds the standard; use an outside caliper to check the diameter of the closing pin to determine if the wear has failed.

[0045] The overall flatness of the frame is checked using a flat ruler and feeler gauge. If the flatness error exceeds 0.6mm, it is considered unqualified and the parts need to be replaced.

[0046] A high-precision aperture ruler was used to measure the hole diameter of the frame positioning pins. If the hole diameter exceeded 42mm, it was determined that the wear was excessive and the pins needed to be replaced.

[0047] The diameter of the closing pin is measured using an outside caliper. If the diameter is less than 38mm, it is determined to be worn and in failure, and the part needs to be replaced.

[0048] S2. Thrust Frame Inspection: Use an inside micrometer to check the inner diameter of the copper sleeve on both sides of the thrust frame. If the inner diameter of the copper sleeve on the fixed pin side is greater than 42mm and the inner diameter of the copper sleeve on the closing pin side is greater than 47mm, the copper sleeve is considered to be worn beyond the standard and needs to be replaced. Use a feeler gauge to check the assembly clearance between the lever shaft and the mating groove. If the clearance is greater than 1mm, the fit is considered to be loose and the corresponding parts need to be repaired or replaced.

[0049] A two-way planarity quantitative inspection of the thrust frame is carried out using a level ruler and a 2mm standard feeler gauge: A level ruler is arranged along the direction parallel to the hydraulic cylinder axis, and a 2mm feeler gauge is inserted into the contact gap between the level ruler and the frame. If the feeler gauge can pass through smoothly, it is determined that the planarity of the frame exceeds the standard and the deformation fails, and the spare parts need to be replaced.

[0050] Arrange a level again along the direction perpendicular to the hydraulic cylinder axis, and repeat the 2mm feeler gauge test. If the feeler gauge passes through, it is considered unqualified and a spare part needs to be replaced. If the flatness of the frame fails in either direction during the bidirectional flatness test, the component is directly considered to be faulty and needs to be replaced. After completing all the test items of the thrust frame, apply a layer of high-temperature lubricating oil evenly to the contact surface between the inner wall of the bushing and the rocker chamber to complete the protective maintenance treatment.

[0051] S3. Return Spring Performance Testing: The return spring of the mechanism door is tested for pressure load using a spring pressure tester. The acceptable range for spring pressure is 3.3KN–4.53KN. When the spring pressure meets the condition of 3.3KN ≤ pressure ≤ 4.53KN, it is considered qualified and can continue to be used. When the spring pressure is < 3.3KN, it is determined that the spring has fatigue failure and severe elasticity attenuation, and it should be scrapped and strictly prohibited from being used again. When the pressure value is higher than 4.53KN, it is determined that the stiffness is abnormal.

[0052] S4. Lever rocker arm inspection: Thoroughly clean the rocker arm components to remove surface oil, dust, rust, and other impurities. Inspect the body to check for cracks, wear, deformation, and scoring defects. Use high-precision calipers to quantitatively inspect the key dimensions of the rocker arm: Measure the width H of the rocker arm head. If the width H < 46mm, the wear is considered excessive, and a new spare part is required. Measure the assembly diameter on both sides of the rocker arm shaft. If the measured shaft diameter is < 20mm, the pin shaft is considered worn and ineffective, and a new spare part is required. For qualified rockers, they can be put into normal use or kept as spares. After passing the inspection, apply a layer of high-temperature lubricating oil evenly to the surface of the rocker arm, shaft, and assembly contact surfaces to complete the protective maintenance.

[0053] S5. Drive Frame Inspection and Repair: Thoroughly clean the drive moving frame to remove impurities and oil stains from the sliding surface, mating groove, and side walls; after cleaning, conduct a comprehensive inspection of the frame body to check for burrs, cracks, twisting deformation, localized scratches, and structural defects; minor scratches on the side of the drive frame are considered normal signs of use and must not be polished to avoid damaging the original assembly tolerances and mating surface precision.

[0054] The overall width 'a' of the drive frame is measured using a high-precision vernier caliper. The acceptable size range is: 336mm < a < 340mm. If the measured width 'a' exceeds this acceptable range, the drive frame must be corrected and repaired to bring the size back to the original design reference size 'a' = 339 ± 0.25mm.

[0055] S6. Underboard frame inspection: Select brand new standard underboard parts for trial assembly inspection. Place the new underboard completely into the underboard cavity to verify whether it can be fully and snugly installed. If the underboard shakes or moves within the cavity after trial assembly, it is determined that the cavity fit accuracy is abnormal. First, thoroughly clean the underboard cavity to completely remove burrs, protrusions, residual debris, dust, oil stains and other foreign objects from the inner wall of the cavity.

[0056] After completing the chamber cleaning operation, the diagonal plane of the sliding plate chamber is quantitatively inspected: a 400mm standard length flat ruler and a 0.6mm fixed value feeler gauge are used for double diagonal inspection. First, the flat ruler is placed close to the first diagonal direction of the chamber, and a 0.6mm feeler gauge is inserted into the gap between the flat ruler and the chamber. Then, the above inspection operation is repeated on the other diagonal direction.

[0057] If a 0.6mm feeler gauge can be easily inserted into any diagonal testing position, it is determined that the flatness deformation of the lower slide cavity exceeds the standard and the precision of the mating surface fails. The cavity plane needs to be corrected and repaired. If it cannot be repaired, the entire lower slide frame spare part should be replaced directly.

[0058] S7. Horseshoe Inspection: Thoroughly clean the entire horseshoe, guide rod, eccentric wheel, eccentric wheel chamber, T-nut and connecting bolts to completely remove surface oil, carbon deposits, dust, rust particles and wear debris, ensuring that there are no foreign objects interfering with the inspection contact surface and ensuring inspection accuracy.

[0059] After cleaning, place the horseshoe flat on the standard testing platform and use a high-precision vernier caliper to measure the width dimension X of the horseshoe. If the measured X value is greater than 234mm, it is determined that the horseshoe is worn overall and the structural dimensions are out of standard, and a brand new spare part should be replaced. Specific Implementation Example 2:

[0061] After the return spring performance test, the spring chamber slide groove is inspected. The slide groove surface is checked for scratches, wear, deformation, chipping, corrosion and other damage defects. A high-precision vernier caliper is used to measure the width S value at the middle position and the width S value at both sides of the slide groove to quantitatively determine the degree of wear. The judgment standard is: the width S value at the middle position of the slide groove is less than 49mm and the width S value at both sides of the slide groove is less than 51mm to be qualified. If the slide groove has structural damage, or the measured width S value at the middle position is ≥49mm and the width S value at both sides is ≥51mm, the slide groove is judged to have excessive wear and failure of fit accuracy, and the corresponding chamber spare parts need to be replaced as a whole. Specific Implementation Example 3:

[0063] It is normal for there to be scratches on the side of the drive frame. Do not sand them. Measure its flatness according to the following steps: Perform a flatness test on the drive frame in the axial direction: Set up a level parallel to the axis of the moving frame, and insert a 2mm standard feeler gauge into the gap between the level and the frame. If the 2mm feeler gauge passes through smoothly, it is determined that the flatness of the frame exceeds the standard and has been deformed. The moving frame needs to be leveled and corrected. If the moving frame cannot be leveled manually, replace it with a new one.

[0064] Detect the inner diameter d of the drive frame U-shaped fork. If the measured diameter d > 38mm, it is determined that the wear and expansion of the U-shaped fork mating hole exceeds the standard. It needs to be corrected and repaired to the original reference size d = 36mm. If it cannot be repaired, replace it with a brand new spare part.

[0065] After completing all dimensional, geometric, and visual inspections and repairs of the drive frame, apply a layer of high-temperature lubricating oil evenly to all sliding surfaces of the drive frame to reduce sliding friction and prevent rust and abnormal wear. Specific Implementation Example 4:

[0067] Horseshoe flatness test on standard testing platform: Use 1mm standard fixed value feeler gauge to test the gap between the horseshoe and the platform support surface. If the 1mm feeler gauge can be easily inserted into the gap between the horseshoe and the platform, it is determined that the horseshoe flatness deformation exceeds the standard and the support surface is warped and failed. The spare part needs to be replaced directly. At the same time, check the horseshoe slide support surface. If there are unevenness, scratches, chipped edges, or structural damage, it is directly determined to be failed and replaced.

[0068] When the wear depth of the eccentric wheel contact surface of the horseshoe is measured to exceed 1mm, it is determined that the wear of the eccentric wheel mating surface is severe and the transmission fit accuracy is failed. The entire horseshoe and matching guide rod assembly should be replaced with brand new ones.

[0069] The horseshoe guide rod is subjected to straightness bending test: The guide rod is placed on a standard test plane, and the longitudinal parameters X1 and X2 at both ends of the guide rod are obtained by multi-point measurement. The difference between X1 and X2 is calculated. The judgment standard is: if the difference between X1 and X2 is <0.5mm, it is qualified. If the difference is ≥0.5mm, it is determined that the guide rod has bent and deformed, and the straightness exceeds the standard. The sliding guidance accuracy cannot be guaranteed, and a brand new spare part must be replaced. Specific Implementation Example 5:

[0071] An inspection method for mechanical doors is applied to the systematic inspection, measurement, and assembly of sliding doors in high-temperature and high-pressure environments, thereby achieving a standardized assembly process.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for inspecting a mechanism door, characterized in that: Includes the following steps; S1. Upper slide frame inspection: Inspect the frame surface to check for cracks, burns, and plastic deformation defects; use a flat ruler and feeler gauge to check the overall flatness error of the frame; use a high-precision aperture ruler to measure the diameter of the frame positioning pin holes to determine if the wear exceeds the standard; use an outside caliper to check the diameter of the closing pin to determine if the wear has failed. S2. Thrust Frame Inspection: Use an inside micrometer to check the inner diameter of the copper sleeve on both sides of the thrust frame. If the inner diameter of the copper sleeve on the fixed pin side is greater than 42mm and the inner diameter of the copper sleeve on the closing pin side is greater than 47mm, the copper sleeve is considered to be worn beyond the standard and needs to be replaced. Use a feeler gauge to check the assembly clearance between the lever shaft and the mating groove. If the clearance is greater than 1mm, the fit is considered to be loose and the corresponding parts need to be repaired or replaced. S3. Return Spring Performance Testing: The return spring of the mechanism door is tested for pressure load using a spring pressure tester. The acceptable range for spring pressure is 3.3KN–4.53KN. When the spring pressure meets the condition of 3.3KN ≤ pressure ≤ 4.53KN, it is considered qualified and can continue to be used. When the spring pressure is < 3.3KN, it is determined that the spring has fatigue failure and severe elasticity attenuation, and it should be scrapped and strictly prohibited from being used again. When the pressure value is higher than 4.53KN, it is determined that the stiffness is abnormal. S4. Lever rocker arm inspection: Thoroughly clean the rocker arm components to remove surface oil, dust, rust, and other impurities. Inspect the body to check for cracks, wear, deformation, and scoring defects. Use high-precision calipers to quantitatively inspect the key dimensions of the rocker arm: Measure the width H of the rocker arm head. If the width H < 46mm, the wear is considered excessive, and a new spare part is required. Measure the assembly diameter on both sides of the rocker arm shaft. If the measured shaft diameter is < 20mm, the pin shaft is considered worn and ineffective, and a new spare part is required. For qualified rockers, they can be put into normal use or kept as spares. After passing the inspection, apply a layer of high-temperature lubricating oil evenly to the surface of the rocker arm, shaft, and assembly contact surfaces to complete the protective maintenance. S5. Drive Frame Inspection and Repair: Thoroughly clean the drive moving frame to remove impurities and oil stains from the sliding surface, mating groove, and side walls; after cleaning, conduct a comprehensive inspection of the frame body to check for burrs, cracks, twisting deformation, localized scratches, and structural defects; minor scratches on the side of the drive frame are considered normal signs of use and must not be polished to avoid damaging the original assembly tolerances and mating surface precision. The overall width 'a' of the drive frame is measured using a high-precision vernier caliper. The acceptable size range is: 336mm < a < 340mm. If the measured width 'a' exceeds this acceptable range, the drive frame must be corrected and repaired to bring the size back to the original design reference size 'a' = 339 ± 0.25mm. S6. Underboard frame inspection: Select brand new standard underboard parts for trial assembly inspection. Place the new underboard completely into the underboard cavity to verify whether it can be fully and snugly installed. If the underboard shakes or moves within the cavity after trial assembly, it is determined that the cavity fit accuracy is abnormal. First, thoroughly clean the underboard cavity to completely remove burrs, protrusions, residual debris, dust, oil stains and other foreign objects from the inner wall of the cavity. S7. Horseshoe Inspection: Thoroughly clean the entire horseshoe and guide rod to completely remove surface oil, carbon deposits, dust, rust particles and wear debris, ensuring that there are no foreign objects interfering with the inspection contact surface and ensuring inspection accuracy; After cleaning, place the horseshoe flat on the standard testing platform and use a high-precision vernier caliper to measure the width dimension X of the horseshoe. If the measured X value is greater than 234mm, it is determined that the horseshoe is worn overall and the structural dimensions are out of standard, and a brand new spare part should be replaced.

2. The method for inspecting a mechanism door according to claim 1, characterized in that, In step S1, a flat ruler and feeler gauge are used to check the overall flatness of the frame. If the flatness error exceeds 0.6mm, it is deemed unqualified and the component needs to be replaced. A high-precision aperture ruler was used to measure the hole diameter of the frame positioning pins. If the hole diameter exceeded 42mm, it was determined that the wear was excessive and the pins needed to be replaced. The diameter of the closing pin is measured using an outside caliper. If the diameter is less than 38mm, it is determined to be worn and in failure, and the part needs to be replaced.

3. The method for inspecting a mechanism door according to claim 2, characterized in that, In step S2, a horizontal ruler and a 2mm standard feeler gauge are used to perform bidirectional planar quantitative testing on the thrust frame: the horizontal ruler is arranged along the direction parallel to the hydraulic cylinder axis, and a 2mm feeler gauge is inserted into the contact gap between the horizontal ruler and the frame. If the feeler gauge can pass through smoothly, it is determined that the flatness of the frame exceeds the standard and the deformation fails, and the spare parts need to be replaced. Arrange a level again along the direction perpendicular to the hydraulic cylinder axis, and repeat the 2mm feeler gauge test. If the feeler gauge passes through, it is considered unqualified and a spare part needs to be replaced. If the flatness of the frame fails in either direction during the bidirectional flatness test, the component is directly considered to be faulty and needs to be replaced. After completing all the test items of the thrust frame, apply a layer of high-temperature lubricating oil evenly to the contact surface between the inner wall of the bushing and the rocker chamber to complete the protective maintenance treatment.

4. The method for inspecting a mechanism door according to claim 3, characterized in that, In step S5, it is normal for there to be scratches on the side of the drive frame. Do not polish them. Measure its flatness according to the following steps: Perform a flatness test on the drive frame in the axial direction: Set up a level parallel to the axis of the moving frame, and insert a 2mm standard feeler gauge into the gap between the level and the frame. If the 2mm feeler gauge can pass through smoothly, it is determined that the flatness of the frame exceeds the standard and deformation has occurred. The moving frame needs to be leveled and corrected. If the moving frame cannot be leveled manually, replace it with a new one.

5. The method for inspecting a mechanism door according to claim 4, characterized in that, In step S5, the inner diameter d of the drive frame U-shaped fork is detected. If the measured diameter d > 38 mm, it is determined that the wear and expansion of the U-shaped fork mating hole exceeds the standard. It needs to be corrected and repaired to the original reference size d = 36 mm. If it cannot be repaired, a brand new spare part is directly replaced. After completing all dimensional, geometric, and visual inspections and repairs of the drive frame, apply a layer of high-temperature lubricating oil evenly to all sliding surfaces of the drive frame to reduce sliding friction and prevent rust and abnormal wear.

6. The method for inspecting a mechanism door according to claim 5, characterized in that, After completing the chamber cleaning operation in step S6, a quantitative test of the diagonal plane of the sliding plate chamber is performed: a 400mm standard length flat ruler and a 0.6mm fixed value feeler gauge are used for double diagonal testing. First, the flat ruler is placed along the first diagonal direction of the chamber, and a 0.6mm feeler gauge is inserted into the gap between the flat ruler and the chamber. Then, the above testing operation is repeated along the other diagonal direction. If a 0.6mm feeler gauge can be easily inserted into any diagonal testing position, it is determined that the flatness deformation of the lower slide cavity exceeds the standard and the precision of the mating surface fails. The cavity plane needs to be corrected and repaired. If it cannot be repaired, the entire lower slide frame spare part should be replaced directly.

7. The method for inspecting a mechanism door according to claim 6, characterized in that, In step S7, the flatness of the horseshoe is tested on a standard testing platform: a 1mm standard fixed value feeler gauge is used to test the gap between the horseshoe and the platform support surface. If the 1mm feeler gauge can be easily inserted into the gap between the horseshoe and the platform, it is determined that the flatness deformation of the horseshoe exceeds the standard and the support surface is warped and failed. The spare part needs to be replaced directly. At the same time, the support surface of the horseshoe slide is checked. If there are unevenness, scratches, chipped edges, or structural damage, it is determined to be failed and replaced directly. When the wear depth of the eccentric wheel contact surface of the horseshoe is measured to exceed 1mm, it is determined that the wear of the eccentric wheel mating surface is severe and the transmission fit accuracy is failed. The entire horseshoe and matching guide rod assembly should be replaced with brand new ones.

8. The method for inspecting a mechanism door according to claim 7, characterized in that, In step S7, the horseshoe guide rod is subjected to a straightness bending test: the guide rod is placed on a standard test plane, and the longitudinal parameters X1 and X2 at both ends of the guide rod are obtained by multi-point measurement. The difference between X1 and X2 is calculated. The judgment standard is: if the difference between X1 and X2 is <0.5mm, it is qualified. If the difference is ≥0.5mm, it is determined that the guide rod has bent and deformed, and the straightness exceeds the standard. The sliding guidance accuracy cannot be guaranteed, and a brand new spare part must be replaced.

9. An application of the inspection method for a mechanism door according to claim 8, characterized in that, The inspection method is applied to the systematic inspection, measurement, and assembly of sliding door systems in high-temperature and high-pressure environments to achieve a standardized assembly process.

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