Cylinder sleeve sealing detection method of RAT type cylinder head for ship

Abstract

The invention discloses a cylinder sleeve sealing detection method for an RAT type cylinder head for a ship, and the method is characterized in that a to-be-detected cylinder sleeve of the RAT type cylinder head is detected through employing a testing tool; the testing tool comprises a sealing piece, a sealing ring and a fixing piece. The detection method comprises the following steps: manufacturing the sealing element according to the inner diameter of the cylinder sleeve; the sealing rings are arranged in the two circular ring grooves respectively; the transition face, connected with the body part, of the head part is a first end face, the end face on the side of the head part is a second end face, the end face on the side of the body part is a third end face, the body part of the sealing piece is inserted into a cylinder sleeve, and the first end face is tightly attached to the end face of the cylinder sleeve; the third end surface clings to the inner surface of the cylinder sleeve; the sealing piece is fixed to the cylinder sleeve through the fixing piece. The testing tool is used for carrying out sealing treatment on the water inlet hole of the cylinder sleeve, wherein the sealing piece is pressed, sealed and shaped, the sealing ring is subjected to leaking stoppage and reinforcement, and the fixing piece is locked and reinforced, so that independent pressure testing of the cylinder sleeve is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of ships and relates to a cylinder sleeve sealing detection method of a RAT type cylinder head for ships. Background Art

[0002] The core position of the ship's main engine is reflected in its power output, which is directly related to navigation safety. Among them, the cylinder head is the core component of the main engine. Under the high-temperature working conditions of the cylinder head fuel injection and combustion, the cylinder head and the cylinder liner together build a precise cooling system. The two work together to ensure the continuous flow of cooling water and achieve effective control of the cylinder head working temperature. Since the cylinder head needs to push the piston to work through internal explosion in a high-temperature combustion environment, its inner cavity is subjected to severe thermal stress shock for a long time. Cylinder head disassembly and inspection is an indispensable maintenance item in ship maintenance.

[0003] At present, some ships use the RAT Sulzer model for cylinder heads. The cylinder liner of this model adopts an inner cavity water outlet structure, and the cooling system presents a special distribution method of water flow of half cylinder head and half cylinder liner. Due to this structure, it is impossible to enter the cylinder liner for pressure testing after the cylinder head is disassembled, forcing technicians to face a dilemma: if the pressure test link is skipped and reinstalled directly, the cylinder head or cylinder liner is prone to cracks and leakage after the main engine is ignited, resulting in secondary disassembly and repair. This unplanned rework not only disrupts the debugging process of the entire ship system, but also causes serious delays in the repair cycle. Therefore, solving the problem of pressure testing and inspection of the cylinder liner of the RAT Sulzer type cylinder head has become a technical difficulty that needs to be overcome in the field of ship maintenance. Summary of the invention

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] A method for detecting the cylinder liner seal of a RAT type cylinder head for a ship, using a test tool to detect the cylinder liner of the RAT type cylinder head to be detected;

[0006] The test fixture includes a seal, a sealing ring and a fixing part;

[0007] The sealing member is a stepped circular ring structure, which includes a head and a body. The outer diameter of the head is larger than that of the body, the outer diameter of the body matches the aperture of the cylinder liner, and the inner diameter of the head is equal to the inner diameter of the body. The outer circumference of the body is provided with two circular grooves, and the positions of the circular grooves correspond to the positions of the water inlet holes in the cylinder liner. The sealing ring is placed in the circular grooves, and the fixing member fixes the sealing member on the cylinder liner.

[0008] The transition surface where the head part is connected to the body part is the first end surface, the end surface on the head part side is the second end surface, and the end surface on the body part side is the third end surface;

[0009] The detection method includes the following steps:

[0010] Manufacture the seal according to the inner diameter size of the cylinder liner;

[0011] Place the sealing rings into the two circular grooves respectively;

[0012] Insert the body of the seal into the cylinder liner, with the first end face closely attached to the end face of the cylinder liner;

[0013] Fix the seal on the cylinder liner by using the fixing parts.

[0014] As a further scheme of the present invention: on the outer circumference of the body of the seal, there are two levels of stepped structures with different diameters arranged axially in sequence, and the circular grooves are arranged on each step.

[0015] As a further scheme of the present invention: the cross-sectional dimension of the sealing ring matches the width of the circular groove.

[0016] As a further scheme of the present invention: the length of the body of the seal is the same as the length of the inner hole of the cylinder liner.

[0017] As a further scheme of the present invention: the fixing part is of a long rod structure, there are four bolt holes equidistantly on the circumference of the cylinder liner, and the two long rod structures are located on the second end face and are respectively fixed in the bolt holes at the diagonal positions through fasteners to make the seal fit with the cylinder liner.

[0018] As a further scheme of the present invention: the step of manufacturing the seal according to the inner diameter size of the cylinder liner includes:

[0019] According to the inner hole size of the cylinder liner, roll the steel plate into a circle and then perform roundness correction;

[0020] Close-weld the cylinder and perform penetrant testing on the weld;

[0021] Perform surface grinding on the end face of the seal;

[0022] According to the position of the water inlet hole of the cylinder head, machine the head and body of the seal;

[0023] Machine the stepped structure according to the position of the water inlet hole and machine the circular groove according to the width of the water inlet hole.

[0024] As a further scheme of the present invention: the step of rolling the steel plate into a circle and then performing roundness correction according to the inner hole size of the cylinder liner includes: first lift the edge of the steel plate and preliminarily roll it into a circle, and then use a jack and / or heating method to align the cylinder with a standard circle, with a tolerance of ±0.2 mm.

[0025] As a further scheme of the present invention: the step of closing-welding the cylinder and performing penetrant testing on the weld includes: fixing the cylinder with a steel pipe or angle steel, and using the groove welding process at the connection of the cylinder.

[0026] As a further solution of the present invention: the flatness of the end face of the seal ≤ 0.05 mm.

[0027] As a further solution of the present invention: the step height tolerance is ±0.1 mm, and the position tolerance of the circular ring groove ≤ 0.3 mm.

[0028] Beneficial effects of the present invention:

[0029] A method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship, which seals the water inlet hole of the cylinder liner through a test tooling: the seal is pressed and shaped, the sealing ring is leak-proof and reinforced, and the fixing part is locked and reinforced to realize the independent pressure test of the cylinder liner. This method breaks through the limitations of the traditional detection process, moves the quality inspection node forward to the maintenance workshop link, supports the verification of the seal of the cylinder liner during the disassembly stage of the cylinder head, and completely avoids the ineffective cycle of "unable to detect after disassembly - can only be tested after reassembly". This method can detect potential leakage hazards in advance, achieve early detection and early repair, simultaneously reduce the labor cost and component loss caused by secondary disassembly and assembly, and shorten a large amount of repair time and human resources. Description of the drawings

[0030] Figure 1 is a schematic diagram of the step flow of a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship;

[0031] Figure 2 is a schematic diagram of the use of a test tooling for a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship;

[0032] Figure 3 is a schematic diagram of the front structure of a cylinder liner of a RAT-type cylinder head for a ship;

[0033] Figure 4 is a schematic diagram of the sectional structure of a cylinder liner of a RAT-type cylinder head for a ship;

[0034] Figure 5 is a schematic diagram of the step flow of the production of a seal for a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship;

[0035] Figure 6 is a schematic diagram of the front structure of a test tooling for a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship;

[0036] Figure 7 is a schematic diagram of the sectional structure of a test tooling for a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship;

[0037] Figure 8 is a schematic diagram of the enlarged sectional partial structure of a test tooling for a method for detecting the seal of a cylinder liner of a RAT-type cylinder head for a ship.

[0038] As shown in the figure:

[0039] 1 - seal, 2 - sealing ring, 3 - fixing part; 4 - cylinder liner;

[0040] 110 - head, 120 - body, 121 - circular groove, 122 - stepped structure;

[0041] 410 - inner hole, 420 - water inlet hole, 430 - bolt hole;

[0042] A - first end face, B - second end face, C - third end face. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be understood that the present application is not limited by the exemplary embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0046] In the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The cooling system of the RAT - type cylinder head of Sulzer. Half of the water in the cooling system is in the cylinder head and half is in the cylinder liner 4. Therefore, when the cylinder head is disassembled for inspection and repair, the cylinder liner 4 needs to be separately sealed and inspected.

[0048] As Figure 1-8 shown, a method for detecting the seal of the cylinder liner of a RAT - type cylinder head for ships uses a test fixture to detect the cylinder liner 4 of the RAT - type cylinder head to be detected.

[0049] Specifically, as Figure 2-4 shown in FIGS. 5 and 6 - 8, the test fixture includes a seal 1, a sealing ring 2, and a fixing member 3; the seal 1 is a stepped ring structure, and the stepped ring structure includes a head 110 and a body 120. The outer diameter of the head 110 is larger than the outer diameter of the body 120. The outer diameter of the body 120 matches the inner diameter of the cylinder liner 4, and the inner diameter of the head 110 is equal to the inner diameter of the body 120; two circular grooves 121 are provided on the outer periphery of the body 120, and the positions of the circular grooves 121 correspond to the positions of the water inlet holes 420 in the cylinder liner 4; the sealing ring 2 is placed in the circular grooves 121, and the fixing member 3 fixes the seal 1 on the cylinder liner 4.

[0050] The transition surface where the head 110 is connected to the body 120 is the first end face A, the end face on the side of the head 110 is the second end face B, and the end face on the side of the body 120 is the third end face C.

[0051] As Figure 1 shown, the detection method includes the following steps:

[0052] Manufacture the seal 1 according to the inner diameter size of the cylinder liner 4;

[0053] Place the sealing rings 2 in the two circular grooves 121 respectively;

[0054] Insert the body 120 of the seal 1 into the cylinder liner 4, and the first end face A is closely attached to the end face of the cylinder liner 4;

[0055] Use the fixing member 3 to fix the seal 1 on the cylinder liner 4.

[0056] A method for detecting the seal of the cylinder liner of a RAT - type cylinder head for ships performs a sealing treatment on the water inlet holes 420 of the cylinder liner 4 through a test fixture: the seal 1 is pressed and shaped, the sealing ring 2 plugs and reinforces leaks, and the fixing member 3 locks and reinforces, realizing an independent pressure test on the cylinder liner 4. This method breaks through the limitations of the traditional detection process, moves the quality inspection node forward to the maintenance workshop link, supports the verification of the sealing performance of the cylinder liner 4 during the cylinder head disassembly stage, and completely avoids the ineffective cycle of "unable to detect after disassembly - can only be tested after reassembly". This method can detect potential leakage hazards in advance, achieve early detection and early repair, simultaneously reduce the labor cost and component loss caused by secondary disassembly and assembly, and shorten a large amount of repair time and human resources.

[0057] In this embodiment, as Figure 6-8 shown, the annular groove 121 is provided with the sealing ring 2, and the sealing ring 2 blocks the water inlet hole 420 of the cylinder liner 4. Since the water inlet holes 420 are not in the same plane, but the sealing ring 2 adopts the same specification, the position of the annular groove 121 is correspondingly adjusted. Specifically, two-stage stepped structures 122 with different diameters are axially arranged on the outer circumference of the body 120 of the seal 1 in sequence, and the annular groove 121 is provided on each step to ensure the sealing effect.

[0058] In this embodiment, as Figure 6-8 shown, the sealing ring 2 is used to block the water inlet hole 420 of the cylinder liner 4, and the cross-sectional dimension of the sealing ring 2 matches the width of the annular groove 121. Specifically, the sealing ring 2 is an O-ring, and the elastic O-ring is installed in the annular groove 121 to achieve sealing. The sealing effect depends on the pressure to be sealed, and the sealing effect is efficient and economical.

[0059] In this embodiment, as Figure 6-8 shown, the length of the body 120 of the seal 1 is the same as the length of the inner hole 410 of the cylinder liner 4. The seal 1 is inserted into the inner hole 410 of the cylinder liner 4, the first end face A is closely attached to the end face of the cylinder liner 4, and at the same time, the third end face C is closely attached to the inner surface of the cylinder liner 4. In this way, rapid positioning can be achieved during detection, ensuring the coaxiality of the seal 1 and the inner hole 410 of the cylinder liner 4 during insertion and realizing radial sealing.

[0060] In this embodiment, as Figure 3 、 4 and 6 shown, there are four bolt holes 430 equidistantly arranged on the circumference of the cylinder liner 4 to fix the seal 1 and the cylinder liner 4. As the water pressure inside the cylinder liner 4 increases, the fixing member 3 can prevent the seal 1 from being pushed out of the cylinder liner 4. Specifically, the fixing member 3 is a long rod structure, and two long rod structures are located on the second end face B and are respectively fixed to the bolt holes 430 at the diagonal positions through fasteners to make the seal 1 fit with the cylinder liner 4.

[0061] Specifically, the fixing member 3 can adopt an angle steel. The tie rod is used to pass through the hole positions of the angle steel and the stud holes on both sides of the cylinder liner 4 to achieve fastening. The two fixing members 3 are cross-mounted, and the pre-tightening force of the tie rod is adjusted to make the contact pressure on the surface of the seal 1 uniform.

[0062] In other embodiments, the fixing member is a steel plate, and the directly used steel plate presses the second end face B of the seal 1. Holes are drilled at the edge of the steel plate, and fasteners are used to pass through the holes of the steel plate and the hole positions of the cylinder liner 4 for fastening.

[0063] In this embodiment, as Figure 5 shown, the steps of manufacturing the seal 1 according to the inner diameter size of the cylinder liner 4 include:

[0064] S1: According to the size of the inner hole 410 of the cylinder liner 4, roll the steel plate into a circle and then perform roundness correction;

[0065] S2: Close-weld the cylinder, and perform penetrant testing on the weld;

[0066] S3: Perform surface grinding on the end face of the seal 1;

[0067] S4: According to the position of the water inlet hole 420 of the cylinder head, machine the head 110 and the body 120 of the seal 1;

[0068] S5: Machine the stepped structure 122 according to the position of the water inlet hole 420, and machine the circular groove 121 according to the width of the water inlet hole 420.

[0069] Among them, step S1 includes: According to the size of the inner hole 410 of the cylinder liner 4, roll the steel plate into a cylinder. First, turn up the edge of the steel plate and initially roll it into a circle to avoid local non-roundness. Draw a standard circle on the ground, compare the rolled cylinder with the standard circle, and correct the non-round part by using a jack and / or heating method, with a tolerance of ±0.2 mm.

[0070] Among them, step S2 includes: Fix the cylinder with a steel pipe or angle steel to prevent deformation in the next process and affect the occurrence of non-roundness during machining. After strengthening the cylinder, use the groove welding process for the connection of the cylinder, with multi-layer and multi-pass welding. Open a V-shaped groove from the outer circle, and pay attention to the welding quality during the process to avoid the occurrence of pores or slag in the subsequent machining, which will affect the detection work of the subsequent cylinder head water jacket.

[0071] Among them, step S3 includes: The flatness of the end face of the seal 1 ≤ 0.05 mm. The two end faces are smooth and flat, so as to ensure the tightness with the inner surface of the cylinder liner 4 after being inserted into the cylinder liner 4.

[0072] Among them, step S5 includes: The tolerance of the step height is ±0.1 mm, and the position tolerance of the circular groove 121 ≤ 0.3 mm. Ensure that the machined seal 1 can be inserted into the inner hole 410 of the cylinder liner 4 to press-seal the water inlet hole 420 of the cylinder liner 4.

[0073] It should also be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0074] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting the cylinder liner seal of a RAT type cylinder head for a ship, characterized in that Use a test tooling to detect the cylinder liner of the RAT model cylinder head to be detected; The test tooling includes a seal, a sealing ring and a fixing part; The seal is a stepped ring structure, which includes a head and a body. The outer diameter of the head is greater than that of the body. The outer diameter of the body matches the inner diameter of the cylinder liner, and the inner diameter of the head is equal to the inner diameter of the body. There are two circular grooves on the outer periphery of the body, and the positions of the circular grooves correspond to the positions of the water inlet holes in the cylinder liner. The sealing ring is placed in the circular groove, and the fixing part fixes the seal on the cylinder liner; The transition surface of the head connected to the body is the first end face, the end face on the head side is the second end face, and the end face on the body side is the third end face; The detection method includes the following steps: Manufacture the seal according to the inner diameter size of the cylinder liner; Place the sealing rings in the two circular grooves respectively; Insert the body of the seal into the cylinder liner, and the first end face is closely attached to the end face of the cylinder liner; Use the fixing part to fix the seal on the cylinder liner.

2. The cylinder liner sealing detection method for the RAT type cylinder head used in ships according to claim 1, characterized in that, There are two levels of stepped structures with different diameters arranged axially on the outer periphery of the body of the seal, and the circular grooves are provided on each step.

3. The cylinder liner sealing detection method for the RAT type cylinder head used in ships according to claim 2, characterized in that, The cross-sectional dimension of the sealing ring matches the width of the circular groove.

4. The cylinder liner sealing detection method for the RAT model cylinder head used in ships according to claim 3, characterized in that, The length of the body of the seal is the same as the length of the inner hole of the cylinder liner.

5. The cylinder liner sealing detection method for the RAT type cylinder head used in a ship according to claim 4, characterized in that, The fixing part is a long rod structure. There are four bolt holes evenly spaced on the circumference of the cylinder liner. The two long rod structures are located on the second end face and are respectively fixed in the bolt holes at the diagonal positions through fasteners to make the seal fit with the cylinder liner.

6. The cylinder liner sealing detection method for the RAT model cylinder head used in ships according to claim 1 or 5, characterized in that, The step of manufacturing the seal according to the inner diameter size of the cylinder liner includes: According to the inner hole size of the cylinder liner, roll the steel plate into a circle and then perform roundness correction; Seal the cylinder and weld it, and perform penetrant inspection on the weld; Perform surface grinding on the end face of the seal; According to the position of the water inlet hole of the cylinder head, machine the head and body of the seal; Machine the stepped structure according to the position of the water inlet hole, and machine the circular groove according to the width of the water inlet hole.

7. The cylinder liner sealing detection method for the RAT type cylinder head used in ships according to claim 6, characterized in that, The step of rolling the steel plate into a circle and then performing roundness correction according to the inner hole size of the cylinder liner includes: first raise the edge of the steel plate and initially roll it into a circle, and then use a jack and / or heating method to calibrate the cylinder with a standard circle, with a tolerance of ±0.2 mm.

8. The cylinder liner sealing detection method for the RAT type cylinder head used in ships according to claim 6, characterized in that, The step of sealing and welding the cylinder and performing penetrant inspection on the weld includes: fixing the cylinder with a steel pipe or angle steel, and using the groove welding process at the connection of the cylinder.

9. The cylinder liner sealing detection method for the RAT type cylinder head used in a ship according to claim 6, characterized in that, The flatness of the end face of the seal ≤ 0.05 mm.

10. The cylinder liner sealing detection method for the RAT type cylinder head used in ships according to claim 6, characterized in that, The tolerance of the step height is ±0.1 mm, and the positional tolerance of the circular groove ≤ 0.3 mm.

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