A calibration device and method for double-wall high-pressure oil pipe of marine diesel engine

Abstract

A verification device and method for a double-wall high-pressure oil pipe for a marine diesel engine, the verification device comprising a plurality of inspection elements, a plurality of support frames and a bottom plate; the inspection elements and the support frame are fixed on the bottom plate according to the three-dimensional shape and size of the double-wall high-pressure oil pipe, and are used to place and inspect the double-wall high-pressure oil pipe, the support frame is located below the double-wall high-pressure oil pipe, the inspection elements are arranged at both ends of the double-wall high-pressure oil pipe, and include a detection plate, a fixed base, an end sleeve, a adapter, a limit plate, a guide column, a handle and a guide tube, and an observation hole is provided on the end sleeve; the gap size between the end of the double-wall high-pressure oil pipe and the detection plate is confirmed through the observation hole, and the contact gap between the double-wall high-pressure oil pipe and the support frame is observed, and the shape deviation of the double-wall high-pressure oil pipe is confirmed, and the double-wall high-pressure oil pipe is completely in contact with the support frame and the detection plate through correction, thereby completing the verification of the double-wall high-pressure oil pipe. The present invention ensures the installation accuracy of the main engine, realizes the reduction of detection cost, improves the operation efficiency, and has the advantages of simple structure and convenient use.

Description

Technical Field

[0001] The present invention relates to the manufacture of pipe fittings for marine low-speed diesel engines, and in particular to a calibration device and method for double-wall high-pressure oil pipes for marine diesel engines, belonging to the technical field of diesel engine manufacturing. Background Art

[0002] There are many double-walled high-pressure oil pipes installed on low-speed diesel engines. These double-walled high-pressure oil pipes have small installation gaps and high precision dimensions. When making the bent pipes, both ends need to be processed first before the whole pipe can be bent. In the actual bending operation, due to the very thick wall thickness of the pipe, high strength, and two layers, the size of the double-walled high-pressure oil pipe after bending has a certain deviation, which directly affects the final installation accuracy. In order to ensure the accuracy of the installation size of the double-walled high-pressure oil pipe in the diesel engine, the double-walled high-pressure oil pipe after bending can only be inspected by a three-coordinate measuring instrument. However, this detection method is too expensive and has certain limitations. At present, there is no special equipment that can conveniently and effectively detect double-walled high-pressure oil pipes. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a calibration device and method for double-wall high-pressure oil pipes for marine diesel engines, so as to inspect and confirm the bent double-wall high-pressure oil pipes so as to facilitate timely repair, thereby achieving the purpose of controlling quality in advance and ensuring the final installation accuracy, while achieving the effect of reducing detection costs, improving operating efficiency and facilitating operation.

[0004] Based on the above purpose, the technical solution provided by the present invention is as follows:

[0005] A double-wall high-pressure oil pipe inspection device for marine diesel engines, characterized in that: the inspection device comprises a plurality of inspection elements, a plurality of support frames and a bottom plate; the inspection elements and the support frames are fixed on the bottom plate according to the three-dimensional shape and size of the double-wall high-pressure oil pipe, and are used to place and inspect the double-wall high-pressure oil pipe;

[0006] The bottom plate is the bottom support platform of the verification device, and is provided with a plurality of positioning holes for fixing the verification element and the support frame;

[0007] The support frame is located below the double-wall high-pressure oil pipe, and a U-shaped groove with an inclined angle is provided on the upper part;

[0008] The inspection element is arranged at both ends of the double-wall high-pressure oil pipe, and includes a detection plate, a fixed base, an end sleeve, an adapter, a limit plate, a guide column, a handle and a guide tube;

[0009] The fixed base is fixed on the positioning hole of the bottom plate and is provided with a center hole, the conduit is arranged in the center hole and fixed by screws, the guide post is inserted into the conduit and can slide therein, a locking pin is provided on the outer periphery of the guide post, the limit plate is fixed on the fixed base and is located beside the guide post, a limit groove for embedding the locking pin of the guide post is provided on the limit plate, the handle is fixedly connected to the rear end of the guide post, the detection plate is fixedly connected to the front end of the guide post, the end sleeve is connected to the detection plate through the adapter and is used to sleeve the end of the double-wall high-pressure oil pipe, and the end sleeve is provided with an observation hole for observing the gap between the end of the double-wall high-pressure oil pipe and the detection plate; the handle drives the end sleeve to move forward and backward through the guide post, the detection plate and the adapter, so that the end sleeve is quickly inserted into the end of the double-wall high-pressure oil pipe, and the rotation of the handle embeds the locking pin of the guide post into the limit groove of the limit plate, thereby limiting and locking the inspection element.

[0010] Furthermore, the plurality of positioning holes include threaded holes and round holes, which are processed once by a three-coordinate machine tool and are selected for use according to the three-dimensional shape and size of the double-wall high-pressure oil pipe being calibrated.

[0011] Furthermore, the inner diameter of the U-shaped groove of some of the support frames is 0.3 mm larger than the outer diameter of the inner tube of the double-walled high-pressure oil pipe, so as to support the inner tube; the inner diameter of the U-shaped groove of some of the support frames is 0.3 mm larger than the outer diameter of the outer tube of the double-walled high-pressure oil pipe, so as to support the outer tube.

[0012] Furthermore, the inclination angle and height of the U-shaped groove of each support frame are determined according to the three-dimensional shape and size of the double-wall high-pressure oil pipe.

[0013] Furthermore, the center of the end sleeve is processed into the shape of the end of the double-walled high-pressure oil pipe; the end of the detection plate is provided with a countersunk hole to protect the end of the double-walled high-pressure oil pipe from being damaged.

[0014] Another technical solution of the present invention is as follows:

[0015] A calibration method for a double-wall high-pressure oil pipe of a marine diesel engine implemented by using the above-mentioned calibration device comprises the following steps:

[0016] Step 1: insert the locking pin on the guide column into the limiting groove of the limiting plate to lock the position of the guide column;

[0017] Step 2: Put the double-wall high-pressure oil pipe to be tested on the support frame and between the two inspection elements, insert one end of the double-wall high-pressure oil pipe into the end sleeve of one inspection element, and then insert the other end of the double-wall high-pressure oil pipe into the end sleeve of the other inspection element by rotating and moving the handle;

[0018] Step 3: Observe through the observation hole of the end sleeve to confirm whether the end of the double-wall high-pressure oil pipe is in contact with the detection plate and the size of the gap between them: when the gap is greater than 1mm, it is confirmed that the size of the double-wall high-pressure oil pipe at this end is too short, then take out the double-wall high-pressure oil pipe, correct the angle of the double-wall high-pressure oil pipe by turning it so that the end of the double-wall high-pressure oil pipe extends outward, and observe and inspect again, and repeat the inspection until the gap between the end of the double-wall high-pressure oil pipe and the detection plate is less than 1mm;

[0019] Step 4: Check whether there is any gap between the outer tube and inner tube of the double-wall high-pressure oil pipe and the U-shaped groove of the support frame to confirm whether there is any deviation in the three-dimensional shape of the double-wall high-pressure oil pipe. If there is a gap, adjust the bending angle of the double-wall high-pressure oil pipe so that the double-wall high-pressure oil pipe is in full contact with the U-shaped groove of the support frame, thereby correcting the shape deviation of the double-wall high-pressure oil pipe and completing all the verification work of the double-wall high-pressure oil pipe.

[0020] The present invention can verify whether a double-wall high-pressure oil pipe is deformed after bending and determine the deformation direction, deviation position point and size, and make a final inspection before installing a diesel engine to ensure that the shape accuracy of each double-wall high-pressure oil pipe is consistent with the requirements of the drawing during installation, thereby not affecting the quality requirements.

[0021] Compared with the traditional inspection method of double-wall high-pressure fuel pipe of diesel engine, the present invention has the following advantages:

[0022] 1. High operating efficiency - the double-wall high-pressure oil pipe to be inspected only needs to be directly placed, and the deformation direction and position can be confirmed through the support frame and the inspection plate. The inspection operation is simple and the installation and use are safe.

[0023] 2. Wide range of applications: It can be used for the size inspection and shaping of three double-wall high-pressure oil pipes with different spatial sizes after bending.

[0024] 3. High precision and stability - the base plate is processed by XYZ three-coordinate machine tool with high precision and manufactured 1:1 according to the correct trajectory of double-wall high-pressure oil pipe, ensuring that the size of the pipes inspected and calibrated in each batch remains consistent.

[0025] 4. Low investment cost - the verification device is an integrated arrangement with a simple and compact structure, low requirements on processing precision, easy to manufacture, and greatly reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural diagram of the inspection element.

[0028] Figure 3 It is a structural schematic diagram of the end sleeve.

[0029] Figure 4 It is a structural diagram of the detection board.

[0030] Figure 5 It is a schematic diagram of the verification state of the present invention.

[0031] In the figure, A—double-wall high-pressure oil pipe, B—calibration device, C—inspection element, D—support frame, E—base plate, F—detection plate, G—fixed base, H—end sleeve, I—adapter, J—limiting plate, K—guide column, L—handle, and M—catheter. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Any equivalent changes and modifications made based on the contents of this specification belong to the technical scope of the present invention.

[0033] The present invention is used for checking the double-wall high-pressure oil pipe. After the double-wall high-pressure oil pipe is bent, the dimensional error and the spatial direction trajectory of the double-wall high-pressure oil pipe end are checked to see whether they meet the requirements of the drawing, thereby completing the inspection of the double-wall high-pressure oil pipe to ensure the installation accuracy and assembly cycle of the main engine and reduce the inspection cost.

[0034] Example

[0035] This embodiment is used to simultaneously detect three double-walled high-pressure oil pipes. Figure 1 As shown, the inspection device B for the double-wall high-pressure oil pipe of a marine diesel engine comprises a plurality of inspection elements C, a plurality of support frames D and a bottom plate E. The inspection elements C and the support frames D are fixed on the bottom plate E, and they are arranged according to the length and shape of the pipe fittings in accordance with the 3D model of the double-wall high-pressure oil pipe A in a 1:1 ratio, and are used to place and inspect the double-wall high-pressure oil pipe A.

[0036] The base plate E is the bottom support platform of the verification device, and is provided with 50 M8 threaded holes and 50 circular holes with a diameter of 6 mm, which are processed by an XYZ three-coordinate machine tool to form a positioning hole system. The several inspection elements C and multiple support frames D select some of the positioning holes for fixed connection according to the three-dimensional shape of the double-wall high-pressure oil pipe A to be verified.

[0037] There are 12 support frames D, which are located below the double-walled high-pressure oil pipe A and are used to place and inspect the double-walled high-pressure oil pipe A. Two M8 threaded holes and two 6mm diameter round holes are drilled on the bottom surface of the support frame D, which are fixed to the positioning holes of the bottom plate E by screws and round pins; among them, 4 are used to support the double-walled high-pressure oil pipe, and are provided with inclined surfaces with an inclined angle; 4 are used to support the inner tube of the double-walled high-pressure oil pipe and detect the direction of the inner tube, and are provided with U-shaped grooves with an inclined angle, and the inner diameter size of the U-shaped groove is processed by expanding the outer diameter size of the inner tube by 0.3mm; and 4 are used to support the outer tube and detect the direction of the outer tube, and are provided with U-shaped grooves with an inclined angle, and the inner diameter size of the U-shaped groove is processed by expanding the outer diameter size of the outer tube by 0.3mm. The inclination angle and height of the U-shaped groove of each support frame D are different, depending on the three-dimensional spatial shape of the double-walled high-pressure oil pipe A to be detected.

[0038] See also Figure 2 There are five inspection elements C, which are arranged at both ends of the double-wall high-pressure oil pipe A. Each inspection element C includes a detection plate F, a fixed base G, an end sleeve H, an adapter I, a limit plate J, a guide column K, a handle L and a guide tube M.

[0039] The bottom surface of the fixed base G is respectively drilled with two M8 threaded holes and two 6mm diameter round holes, which are fixed to the positioning holes of the bottom plate E by screws and round pins; the fixed base G is provided with a central hole for setting the conduit M, and two M8 threaded holes are provided on the side for screwing the screws used to fix the conduit M and the limit plate J. The conduit M is set in the central hole of the bottom plate E, and its axial position is fixed by screws. The guide column K is inserted into the conduit M and can slide therein, and the outer periphery of the guide column K is provided with a radial locking pin. The limit plate J is fixed to the fixed base G by screws and is located beside the guide column K. The limit plate J is provided with a limit groove for embedding the locking pin of the guide column K. The handle L is fixedly connected to the rear end of the guide column K, and the detection plate F is fixedly connected to the front end of the guide column K. The detection plate F is connected to the end sleeve H through the adapter I, and the end sleeve H is used to sleeve the end of the double-wall high-pressure oil pipe A.

[0040] See also Figure 2In order to effectively detect the end length of the double-walled high-pressure oil pipe A, the detection plate F contacts the end face of the double-walled high-pressure oil pipe A, so the limit plate J is added and fixed to the fixed base G by screws. The handle L drives the end sleeve H to move forward and backward through the guide column K, the detection plate F and the adapter I, so that the end sleeve H is quickly inserted into the end of the double-walled high-pressure oil pipe A. At the same time, the handle L rotates to insert the locking pin on the guide column K into the limit groove of the limit plate J, thereby limiting and locking the detection plate F of the inspection element C. An observation hole is processed on the end sleeve H, see Figure 3 , used to observe the contact gap between the end of the double-walled high-pressure oil pipe A and the detection plate F. The center of the end sleeve H is processed into the shape of the end of the double-walled high-pressure oil pipe A. Figure 4 The end of the detection plate F is processed with a countersunk hole to protect the end surface from being damaged when it contacts the end surface of the double-wall high-pressure oil pipe A.

[0041] See also Figure 5 The calibration method for the double-wall high-pressure oil pipe of a marine diesel engine of the present invention comprises the following steps:

[0042] Step 1: Adjust and insert the locking pin of the guide column K on the end of the inspection element C of the inspection device into the limiting groove of the limiting plate J to lock the position of the guide column K.

[0043] Step 2: The double-walled high-pressure oil pipe A to be tested is directly placed into the U-shaped groove of the support frame D of the testing device, and is located between the testing elements C at the two ends. The double-walled high-pressure oil pipe is translated, and one end of the double-walled high-pressure oil pipe is smoothly inserted into the end sleeve H of the testing element C at the end. Then, the testing element C at the other end is moved by rotating the handle L and adjusting the position forward and backward, so that the other end of the double-walled high-pressure oil pipe A is smoothly inserted into the end sleeve H of the testing element C at the end.

[0044] Step three: Observe through the observation hole of the end sleeve H to confirm whether the end of the double-walled high-pressure oil pipe A is in contact with the detection plate F and the size of the gap between them: when the gap is greater than 1mm, it can be confirmed that the size of the double-walled high-pressure oil pipe A at this end is too short, then remove the end of the double-walled high-pressure oil pipe A from the end sleeve H, pull the double-walled high-pressure oil pipe A outward to make its angle smaller, and extend the end outward, and again put the corrected end of the double-walled high-pressure oil pipe A into the inspection element C for observation and inspection, and repeat this process until the gap between the end of the double-walled high-pressure oil pipe A and the detection plate F is less than 1mm.

[0045] Step 4: By observing whether there is a gap between the outer tube and the inner tube of the double-wall high-pressure oil pipe A and the U-shaped groove of the support frame D, confirm whether there is any deviation in the direction of the double-wall high-pressure oil pipe A; if there is a gap in the contact, accurately adjust the bending angle of the double-wall high-pressure oil pipe A to make the double-wall high-pressure oil pipe A fully contact with the U-shaped groove of the support frame D, thereby correcting the deviation of the direction shape of the double-wall high-pressure oil pipe A and completing all the verification work of the double-wall high-pressure oil pipe A.

[0046] The protection scope claimed by the present invention is not limited to the above-mentioned embodiments, but also includes other obvious changes and alternatives to the present invention.

Claims

1. A calibration device for double-wall high-pressure oil pipes of marine diesel engines, characterized in that: The inspection device comprises a plurality of inspection elements, a plurality of support frames and a base plate; the inspection elements and the support frames are fixed on the base plate according to the three-dimensional shape and size of the double-wall high-pressure oil pipe, and are used to place and inspect the double-wall high-pressure oil pipe; The bottom plate is the bottom support platform of the verification device, and is provided with a plurality of positioning holes for fixing the verification element and the support frame; The support frame is located below the double-wall high-pressure oil pipe, and a U-shaped groove with an inclined angle is provided on the upper part; The inspection element is arranged at both ends of the double-wall high-pressure oil pipe, and includes a detection plate, a fixed base, an end sleeve, an adapter, a limit plate, a guide column, a handle and a guide tube; The fixed base is fixed on the positioning hole of the bottom plate and is provided with a center hole, the conduit is arranged in the center hole and fixed by screws, the guide post is inserted into the conduit and can slide therein, a locking pin is provided on the outer periphery of the guide post, the limit plate is fixed on the fixed base and is located beside the guide post, a limit groove for embedding the locking pin of the guide post is provided on the limit plate, the handle is fixedly connected to the rear end of the guide post, the detection plate is fixedly connected to the front end of the guide post, the end sleeve is connected to the detection plate through the adapter and is used to sleeve the end of the double-wall high-pressure oil pipe, and the end sleeve is provided with an observation hole for observing the gap between the end of the double-wall high-pressure oil pipe and the detection plate; the handle drives the end sleeve to move forward and backward through the guide post, the detection plate and the adapter, so that the end sleeve is quickly inserted into the end of the double-wall high-pressure oil pipe, and the rotation of the handle embeds the locking pin of the guide post into the limit groove of the limit plate, thereby limiting and locking the inspection element.

2. The calibration device for double-wall high-pressure oil pipe of marine diesel engine according to claim 1, characterized in that: The plurality of positioning holes include threaded holes and round holes, which are processed once by a three-coordinate machine tool and are selected for use according to the three-dimensional shape and size of the double-wall high-pressure oil pipe being checked.

3. The calibration device for double-wall high-pressure oil pipe of marine diesel engine according to claim 1, characterized in that: The inner diameter of the U-shaped groove of some of the support frames is 0.3 mm larger than the outer diameter of the inner tube of the double-walled high-pressure oil pipe, so as to support the inner tube; the inner diameter of the U-shaped groove of some of the support frames is 0.3 mm larger than the outer diameter of the outer tube of the double-walled high-pressure oil pipe, so as to support the outer tube.

4. The calibration device for double-wall high-pressure oil pipe of marine diesel engine according to claim 1, characterized in that: The inclination angle and height of the U-shaped groove of each support frame are determined according to the three-dimensional shape and size of the double-wall high-pressure oil pipe.

5. The calibration device for double-wall high-pressure oil pipe of marine diesel engine according to claim 1, characterized in that: The center of the end sleeve is processed into the shape of the end of the double-walled high-pressure oil pipe; the end of the detection plate is provided with a countersunk hole to protect the end of the double-walled high-pressure oil pipe from being damaged.

6. A calibration method for a double-wall high-pressure oil pipe of a marine diesel engine implemented by using the calibration device of claim 1, characterized in that: The verification method comprises the following steps: Step 1: insert the locking pin on the guide post into the limiting groove of the limiting plate to lock the position of the guide post; Step 2: Put the double-wall high-pressure oil pipe to be tested on the support frame and between the two inspection elements, insert one end of the double-wall high-pressure oil pipe into the end sleeve of one inspection element, and then insert the other end of the double-wall high-pressure oil pipe into the end sleeve of the other inspection element by rotating and moving the handle; Step 3: Observe through the observation hole of the end sleeve to confirm whether the end of the double-wall high-pressure oil pipe is in contact with the detection plate and the size of the gap between them: when the gap is greater than 1mm, it is confirmed that the size of the double-wall high-pressure oil pipe at this end is too short, then take out the double-wall high-pressure oil pipe, correct the angle of the double-wall high-pressure oil pipe by turning it so that the end of the double-wall high-pressure oil pipe extends outward, and observe and inspect again, and repeat the inspection until the gap between the end of the double-wall high-pressure oil pipe and the detection plate is less than 1mm; Step 4: Check whether there is any gap between the outer tube and inner tube of the double-wall high-pressure oil pipe and the U-shaped groove of the support frame to confirm whether there is any deviation in the three-dimensional shape of the double-wall high-pressure oil pipe. If there is a gap, adjust the bending angle of the double-wall high-pressure oil pipe so that the double-wall high-pressure oil pipe is in full contact with the U-shaped groove of the support frame, thereby correcting the shape deviation of the double-wall high-pressure oil pipe and completing all the verification work of the double-wall high-pressure oil pipe.

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