Tool and method for disassembling fuel injector bush of marine dual-fuel diesel engine

Abstract

The invention relates to a tool and method for disassembling a fuel injector bush of a marine dual-fuel diesel engine, the tool comprises a cross beam, a fixing bolt, a disc, two arc column plates, a bolt, a lead screw and a lead screw nut, the cross beam is fixed on a cylinder cover, the disc is attached to the bush, the two arc column plates are connected to the lower portion of the disc and penetrate through an inner hole of the bush, and the bolt and the lead screw nut are fixed on the cross beam. The lower end extends out of the bottom end and hooks and pulls the lining from the two sides, the lead screw sequentially penetrates through a center hole of the cross beam, a rectangular hole of the disc and an inner hole of the lining between the two arc column plates from top to bottom, a rectangular T-shaped protruding block at the lower end extends out of the lower portion and is embedded into rectangular open grooves of the two arc column plates, and the lead screw nut is connected with the lead screw in a screwed mode and abuts against the upper face of the cross beam. The disassembling tool is placed in the lining from the upper portion of a cylinder cover, the lead screw nut is rotated, the lining is hooked through the lead screw and the arc column plate, friction force of interference installation is overcome, the lining is pulled out of a fuel oil injector installation hole, and disassembling operation of the fuel oil injector lining is completed. According to the invention, the effects of improving the operation efficiency, shortening the maintenance time and reducing the production cost are achieved.

Description

Technical Field

[0001] The invention relates to an assembly process of a marine dual-fuel diesel engine, in particular to a disassembly tool and method for a liner of a pilot oil injector of a marine dual-fuel diesel engine, and belongs to the technical field of marine diesel engine manufacturing. Background Art

[0002] With the development of marine diesel engine technology and increasingly stringent international environmental protection requirements, marine dual-fuel main engines have gradually become the leaders in the shipping industry. The pilot fuel injector is a key component of a marine dual-fuel diesel engine. It is installed on the cylinder head of the main engine. The function of the pilot fuel injector is to inject pilot fuel into the combustion chamber and ignite it, and then ignite the compressed fuel gas in the cylinder liner. After the fuel gas burns and expands, it pushes the piston to reciprocate in the cylinder liner, thereby achieving work. Figure 1 The pilot oil injector is installed in the pilot oil injector mounting hole B on the cylinder head A. The pilot oil injector mounting hole B is a multi-step hole, including a large hole B1 and a small hole B2 connected to each other. The small hole B2 is located at the bottom of the pilot oil injector mounting hole B; a screw hole F for mounting the pilot oil injector is provided on the top of the cylinder head A. Since the working temperature of the pilot oil injector is extremely high, in order to cool the pilot oil injector during operation, a bushing C is provided between the pilot oil injector mounting hole B and the pilot oil injector to construct a cavity D for circulating cooling water to cool the pilot oil injector; the cavity D must be a sealed space to prevent circulating cooling water from entering the combustion chamber. Figure 1 The bushing C shown is installed in the pilot oil injector mounting hole B of the cylinder head A, and the pilot oil injector is installed in the inner hole of the bushing C. The bushing C is a stepped sleeve member, including a large-diameter sleeve C1 and a small-diameter sleeve C2 connected to each other; the small-diameter sleeve C2 is installed in the small hole B2 at the bottom of the pilot oil injector mounting hole B by a cold-fitting process, and the outer circle forms an interference fit with the inner wall of the small hole B2 to achieve a sealing effect; the large-diameter sleeve C1 is accommodated in the large hole B1 of the pilot oil injector mounting hole B, and a cavity D for circulating cooling water is formed between the outer circle and the inner wall of the large hole B1, and a sealing ring E is arranged between the outer periphery of the upper part of the large-diameter sleeve C1 and the inner wall of the large hole B1, so as to cooperate with the interference fit structure at the bottom to completely seal the cavity D to prevent the circulating cooling water from leaking into the combustion chamber.

[0003] After a period of operation, the marine dual-fuel main engine needs maintenance and overhaul. When the pilot oil injector needs to be overhauled and the bushing needs to be replaced, the bushing needs to be removed from the pilot oil injector mounting hole of the cylinder head. Since the small hole at the bottom of the pilot oil injector mounting hole and the small diameter sleeve of the bushing are interference-fitted, the force is relatively large, so the bushing is difficult to disassemble and assemble.

[0004] At present, the traditional bushing removal operation is carried out with the help of bushing removal tools. Figure 2 The bushing removal tool includes a gland 01, a liner 02, a tension screw 03 and a connecting bolt 04. The gland 01 is fixed to the opening of the pilot oil injector mounting hole B of the cylinder head A through the connecting bolt 04 and the screw hole F. The tension screw 03 is connected to the gland 01 through a thread and passes through the pilot oil injector mounting hole B and the bushing C, and extends from the bottom of the small-diameter sleeve C2; ​​the liner 02 is connected to the bottom end of the tension screw 03 and is a stepped cylindrical structure. The small cylinder at the top is inserted into the inner hole of the small-diameter sleeve C2, and the diameter of the large cylinder at the bottom is larger than the inner diameter of the small-diameter sleeve C2 and slightly smaller than the outer diameter of the small-diameter sleeve C2. The liner 02 is milled with an open T-slot for inserting the boss at the bottom end of the tension screw 03 to connect the tension screw 03. Since the large cylindrical diameter of the bushing 02 is larger than the inner diameter of the small diameter sleeve C2, it cannot pass through the inner hole of the bushing C and be placed under the bushing C. Therefore, the bushing removal operation must first remove the entire cylinder head A or the exhaust valve on the cylinder head A, and then the bushing removal tool can be installed in place.

[0005] The conventional bushing disassembly process is as follows: Figure 2 : First, remove the cylinder head A from the main engine, fix the pressure cover 01 with the tension screw 03 screwed on it to the cylinder head A through the connecting bolts 04, and make the tension screw 03 pass through the inner hole of the bushing C, and the bottom end extends out of the small-diameter sleeve C2, and then insert the liner 02 into the bottom end of the tension screw 03 and install it inside the cylinder head A; rotate the tension screw 03 to drive the small cylinder of the liner 02 to enter the inner hole of the small-diameter sleeve C2, and the end face of the large cylinder is close to the bottom surface of the small-diameter sleeve C2; ​​continue to rotate the tension screw 03, with the help of the top force of the fixed pressure cover 01, pull the entire bushing C through the liner 02, overcome the interference friction between the small-diameter sleeve C2 and the small hole B2, and remove the bushing C from the pilot oil injector mounting hole B of the cylinder head A.

[0006] The above-mentioned traditional method of bushing removal has a great defect. Due to the structural limitation of the bushing removal tool, the bushing removal tool cannot be directly installed in the installation hole of the pilot oil injector. Instead, the entire cylinder head must be removed before the bushing removal tool can be installed in place to perform bushing removal. This makes the entire removal process cumbersome and the engineering workload huge. It not only consumes a lot of man-hours, but also requires a lot of equipment resources, which not only prolongs the production cycle and increases the process cost, but also the removal of the cylinder head will lead to unnecessary quality risks. In short, the existing bushing removal device and method have the defects of high cost, long cycle and high risk. Summary of the invention

[0007] The purpose of the present invention is to provide a disassembly tool and method for a marine dual-fuel diesel engine pilot oil injector bushing, wherein the disassembly tool is directly passed through the inner hole of the bushing to complete the bushing removal operation without removing the cylinder head from the main engine, thereby simplifying the operation process and facilitating the operation, thereby achieving the effects of improving operation efficiency, shortening maintenance time, reducing production costs, and ensuring product quality.

[0008] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0009] A disassembly tool for a pilot oil injector bushing of a marine dual-fuel diesel engine, wherein the bushing is installed in a pilot oil injector mounting hole of a cylinder head, a small hole is provided at the bottom of the pilot oil injector mounting hole, the bushing comprises a large-diameter sleeve and a small-diameter sleeve connected to each other, the small-diameter sleeve forms an interference fit with the small hole, and a screw hole for mounting the pilot oil injector is provided on the cylinder head; the feature is that the disassembly tool comprises a crossbeam, a fixing bolt, a disc, two arc column plates, bolts, a screw rod and a screw rod nut;

[0010] The crossbeam is fixed to the cylinder head above the orifice of the pilot oil injector mounting hole through the fixing bolts and screw holes, and a center hole for passing the screw rod is provided in the center of the crossbeam;

[0011] The disc is horizontally attached to the upper part of the large diameter sleeve of the bushing, and the disc is provided with a centrally symmetrical rectangular hole for passing the screw rod;

[0012] The arc column plate is a stepped small semi-cylindrical rod, with an inner plane on the inside and an arc surface on the outside, an arc boss on the lower end, and a rectangular opening groove on the lower end surface; the two arc column plates are connected to the bottom of the disc by the bolts and pass through the inner hole of the bushing, and the lower ends extend out of the bottom end of the small-diameter sleeve, and the bushing is hooked and pulled from both sides by the arc boss; the two arc column plates are relatively and symmetrically distributed on both sides of the rectangular hole of the disc with the inner plane, the arc surfaces of the two arc column plates are on the same circumference and fit with the inner hole of the small-diameter sleeve, and the outer circumferences of the arc bosses of the two arc column plates are on the same circumference and the upper end surfaces fit with the lower end surface of the small-diameter sleeve;

[0013] The screw rod is a round rod-type component, with a thread on the outer circumference and a rectangular T-shaped protrusion on the lower end. The length of the rectangular T-shaped protrusion is greater than the diameter of the screw rod. The screw rod passes through the center hole of the crossbeam, the rectangular hole of the disc and the inner hole of the bushing between the two arc column plates from top to bottom in sequence. The rectangular T-shaped protrusion at the lower end extends out from the bottom of the arc boss and is embedded in the rectangular opening grooves of the two arc column plates at the same time.

[0014] The screw nut is screwed to the upper part of the screw and abuts against the upper surface of the crossbeam.

[0015] Furthermore, connecting holes for connecting the arc column plate are symmetrically provided on both sides of the rectangular hole of the disk.

[0016] Furthermore, the outer diameter of the disc is larger than the inner diameter of the large diameter sleeve and smaller than or equal to the outer diameter of the large diameter sleeve.

[0017] Furthermore, the diameter of the circle where the arc surface is located is equal to the inner diameter of the small-diameter sleeve, and the diameter of the circle where the outer circumference of the arc boss is located is larger than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve.

[0018] Furthermore, the arc column plates must at least meet the following minimum condition: the sum of the maximum distances between the inner planes and the outer peripheries of the arc bosses on the two arc column plates is smaller than the inner diameter of the small-diameter sleeve.

[0019] Furthermore, the diameter of the central hole of the crossbeam is larger than the diagonal distance of the rectangular T-shaped protrusion and smaller than the outer diameter of the screw nut.

[0020] Furthermore, the length of the rectangular T-shaped protrusion is smaller than the length of the rectangular hole of the disk, and the width of the rectangular T-shaped protrusion is smaller than the width of the rectangular hole of the disk and the width of the rectangular opening groove of the arc column plate.

[0021] Furthermore, the distance between the inner planes of the two arc column plates is greater than the width of the rectangular T-shaped protrusion, but less than the length of the rectangular T-shaped protrusion.

[0022] Another technical solution of the present invention is as follows:

[0023] A method for disassembling a pilot oil injector bushing for a marine dual-fuel diesel engine using the above-mentioned disassembly tool, characterized in that: the screw nut is rotated to pull the screw upward through the thread, and the rectangular T-shaped protrusion of the screw hooks the bushing through the circular arc boss of the circular arc column plate, overcoming the interference friction between the small diameter sleeve and the small hole, and pulling the bushing out of the pilot oil injector mounting hole, thereby completing the installation of the disassembly tool from above the cylinder head and realizing the disassembly operation of the pilot oil injector bushing.

[0024] Furthermore, the disassembly method comprises the following specific steps:

[0025] 1) Use the bolts to connect the two arc cylindrical plates to the bottom of the disc, first loosen the bolts on one of the arc cylindrical plates, so that the arc cylindrical plate is in a natural drooping state under the action of gravity, so as to ensure that the large ends of the two parallel arc cylindrical plates can still pass through the inner hole of the bushing at the same time;

[0026] 2) Place the two connected circular arc columns and the disc into the bushing from above the pilot oil injector mounting hole of the cylinder head with the circular arc columns facing downward, so that the disc fits above the large-diameter sleeve of the bushing, and the circular arc bosses at the lower ends of the two circular arc columns pass through the inner hole of the small-diameter sleeve and extend out of the bottom end of the small-diameter sleeve;

[0027] 3) Tighten the bolts so that the arc surfaces of the two arc cylindrical plates are on the same circumference and fit with the inner hole of the small-diameter sleeve, and the diameter of the circumference of the arc surface is equal to the inner diameter of the small-diameter sleeve. At the same time, the upper end surfaces of the arc bosses of the two arc cylindrical plates fit with the lower end surface of the small-diameter sleeve, hooking the lower end of the bushing from both sides, and the outer circumferences of the arc bosses of the two arc cylindrical plates are on the same circumference, and the diameter of the circumference of the outer circumference of the arc boss is greater than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve;

[0028] 4) fixing the crossbeam to the cylinder head above the orifice of the pilot oil injector mounting hole through the fixing bolts and screw holes;

[0029] 5) Screw the screw nut into the upper part of the screw, and with the rectangular T-shaped protrusion facing downward, move the screw from above the pilot oil injector mounting hole of the cylinder head, through the center hole of the crossbeam, the rectangular hole of the disc, and the inner hole of the bushing between the two arc column plates from top to bottom, so that the rectangular T-shaped protrusion extends out from the bottom of the arc boss of the arc column plate;

[0030] 6) rotating the screw rod so that the rectangular T-shaped protrusion is simultaneously embedded in the rectangular opening grooves on the lower end surfaces of the two arc column plates;

[0031] 7) Rotate the screw nut to close against the cross beam, and pull the screw upward through the thread. The rectangular T-shaped protrusion at the lower end of the screw hooks the bushing through the arc boss of the arc column plate, overcomes the interference friction between the small-diameter sleeve and the small hole, and pulls out the bushing, thereby completing the installation of the disassembly tool from the top of the cylinder head and realizing the disassembly operation of the bushing of the pilot oil injector.

[0032] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0033] The present invention realizes the successful installation of a tool having a larger inner diameter than the bushing into the bushing without disassembling the cylinder head or the exhaust valve, and the removal of the bushing of the pilot oil injector, thereby saving the labor time originally required for disassembling the cylinder head when repairing the pilot oil injector, greatly shortening the maintenance period of the marine dual-fuel main engine, simplifying the bushing removal operation, reducing the production cost, and ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the pilot fuel injector mounting holes and bushings.

[0035] Figure 2 This is a schematic diagram of the traditional bushing removal method.

[0036] Figure 3 It is a structural schematic diagram of the present invention.

[0037] Figure 4 yes Figure 3 sectional view of .

[0038] Figure 5 is a schematic diagram of the beam.

[0039] Figure 6 is a schematic diagram of a disk.

[0040] Figure 7 It is a schematic diagram of the arc column plate.

[0041] Figure 8 This is the front view of the arc column plate.

[0042] Fig. 9 yes Figure 8 Left view of .

[0043] Fig.10 yes Figure 8 AA section view.

[0044] Fig.11 yes Figure 8 Right view of .

[0045] Fig.12 This is the connection assembly drawing of the arc column plate and the disc.

[0046] Fig.13 yes Fig.12 Left view of .

[0047] Fig.14 It is a schematic diagram of the screw rod.

[0048] Fig.15 This is the front view of the screw.

[0049] Fig.16 yes Fig.15 Left view of .

[0050] Fig.17 It is a schematic diagram of the lead screw nut.

[0051] Fig.18 It is one of the working state diagrams of the present invention.

[0052] Fig.19 It is the second working state diagram of the present invention.

[0053] In the figure,

[0054] A—cylinder head, B—pilot oil injector mounting hole, B1—large hole, B2—small hole, C—bushing, C1—large diameter sleeve, C2—small diameter sleeve, D—chamber, E—sealing ring, F—screw hole, 01—pressure cover, 02—bushing block, 03—tension screw rod, 04—connecting bolt, 1—screw rod, 11—thread, 12—rectangular T-shaped protrusion, 13—hexagonal head, 2—disc, 21—rectangular hole, 22—connecting hole, 3—arc column plate, 31—arc surface, 32—inner plane, 33—threaded hole, 34—arc boss, 35 —Rectangular opening slot, 4—bolt, 5—screw nut, 6—crossbeam, 61—center hole, 62—opening slot, 7—fixing bolt, d2—outer diameter of the disk, d6—diameter of the center hole, g3—distance between the two inner planes, h1—length of the rectangular T-shaped protrusion, h2—length of the rectangular hole, h3—maximum distance between the inner plane and the outer periphery of the arc boss, r31—radius of the arc surface, r34—radius of the outer periphery of the arc boss, w1—width of the rectangular T-shaped protrusion, w2—width of the rectangular hole, w3—width of the rectangular opening slot. DETAILED DESCRIPTION

[0055] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0056] The present invention is used for disassembly of the liner of the pilot oil injector of a marine dual-fuel diesel engine. Figure 1 The bushing C is installed in the pilot oil injector mounting hole B of the cylinder head A. A small hole B2 is provided at the bottom of the pilot oil injector mounting hole B. The bushing C includes a large-diameter sleeve C1 and a small-diameter sleeve C2 connected to each other. The small-diameter sleeve C2 forms an interference fit with the small hole B2. A screw hole F for mounting the pilot oil injector is provided on the top of the cylinder head A.

[0057] Please refer to Figure 3 and Figure 4 The disassembly tool shown in the figure includes a crossbeam 6, a disc 2, two arc column plates 3, a screw 1, a screw nut 5, a fixing bolt 7 and a bolt 4.

[0058] The two fixing bolts 7 are screwed into the screw holes F of the cylinder head A to fix the crossbeam 6 on the cylinder head A above the opening of the pilot oil injector mounting hole B, so as to bear the removal force of the bushing C transmitted by the screw rod 1. Figure 5 The cross beam 6 has a central hole 61 at its center for passing the screw rod 1 , and opening grooves 62 on both sides for connecting the fixing bolts 7 .

[0059] The disk 2 is horizontally attached to the upper side of the large diameter sleeve C1 of the bushing C, see Figure 6 The disc 2 is provided with a centrally symmetrical rectangular hole 21 for passing the screw rod 1, and the two sides of the rectangular hole 21 are symmetrically provided with connecting holes 22 for connecting the arc column plate 3. In order to enable the disc 2 to be placed above the bushing C when it is placed, and not to fall into the inner hole of the large-diameter sleeve C1, so as to prevent the arc column plate 3 connected thereto from falling off from the bushing C and falling into the combustion chamber, the outer diameter d2 (see Figure 6 ) is larger than the inner diameter of the large diameter sleeve C1, and at the same time is smaller than or equal to the outer diameter of the large diameter sleeve C1.

[0060] The bolts 4 pass through the connection holes 22 to connect with the arc column plate 3 , thereby connecting and fixing the arc column plate 3 below the disc 2 .

[0061] Please refer to Figures 7 to 11 The arc column plate 3 is a stepped small semi-cylindrical rod. The inner side of the arc column plate 3 is an inner plane 32, and the outer side is an arc surface 31. Fig.10 and Fig.11 The upper end surface of the arc column plate 3 is provided with a threaded hole 33 for connecting the disc 2, and the lower end is provided with an arc boss 34 for hooking the bottom end surface of the bushing C. The lower end surface of the arc column plate 3 is provided with a rectangular opening groove 35 for accommodating the lower end of the screw rod 1.

[0062] The two arc column plates 3 are connected to the bottom of the disc 2 through the bolts 4 and the threaded holes 33, and pass through the bushing C. The lower ends of the two arc column plates 3 extend out of the bottom end of the small diameter sleeve C2, and the arc bosses 34 are used to hook the bushing C from both sides. Fig.12 and Fig.13 After being connected to the disk 2, the two arc cylindrical plates 3 are symmetrically distributed on both sides of the rectangular hole 21 of the disk 2 with the inner plane 32 facing each other, and the arc surfaces 31 of the two arc cylindrical plates 3 are on the same circumference, that is, the diameter of the circumference is equal to twice the radius r31 of the arc surface 31 (2r31), see Fig.11 At the same time, the outer circumference of the arc boss 34 of the two arc cylindrical plates 3 is on the same circumference, that is, the diameter of the circumference is equal to twice the radius r34 of the outer circumference of the arc boss 34 (2r34), see Fig. 9 .

[0063] In order to ensure that the lower ends of the two arc column plates 3 can reliably hook the bushing C, please refer to Fig.12After being connected with the disc 2, the arc surfaces 31 of the two arc cylindrical plates 3 fit with the inner hole of the small-diameter sleeve C2, and at this time, twice the radius r31 of the arc surface 31 (2r31) is equal to the inner diameter of the small-diameter sleeve C2; ​​at the same time, the upper end surfaces of the arc bosses 34 of the two arc cylindrical plates 3 fit with the lower end surface of the small-diameter sleeve C2, and twice the outer radius r34 of the arc boss 34 (2r34) is greater than the inner diameter of the small-diameter sleeve C2, but smaller than the outer diameter of the small-diameter sleeve C2.

[0064] In order to allow the two arc column plates 3 to smoothly pass through the inner hole of the bushing C, especially the inner hole of the small diameter sleeve C2, from top to bottom, the size of the arc column plates 3 must at least meet the following minimum conditions: Fig.11 The sum of the maximum distances h3 between the inner plane 32 and the outer periphery of the arc boss 34 on the two arc column plates 3 is smaller than the inner diameter of the small-diameter sleeve C2.

[0065] Please refer to Fig.14 , Fig.15 and Fig.16 The screw rod 1 is a round rod-type component, with a thread 11 on the outer circumference, a hexagonal head 13 on the upper end, and a rectangular T-shaped protrusion 12 on the lower end. The length h1 of the rectangular T-shaped protrusion 12 is greater than the diameter of the rod of the screw rod 1. The screw rod 1 passes through the center hole 61 of the crossbeam 6, the rectangular hole 21 of the disk 2, and the inner hole of the bushing C between the two arc column plates 3 from top to bottom. The rectangular T-shaped protrusion 12 at the lower end extends below the arc boss 34 of the arc column plate 3 and is embedded in the rectangular opening groove 35 on the lower end surface of the two arc column plates 3.

[0066] In order to smoothly install the screw rod 1, the diameter d6 (see Figure 5 ) needs to be greater than the diagonal distance of the rectangular T-shaped protrusion 12; the length h2 of the rectangular hole 21 of the disk 2 (see Figure 6 ) is greater than the length h1 of the rectangular T-shaped protrusion 12 (see Fig.16 ), the width w2 of the rectangular hole 21 (see Figure 6 ) is greater than the width w1 of the rectangular T-shaped protrusion 12 (see Fig.16 ); The distance g3 between the inner planes 32 of the two arc column plates 3 after assembly (see Fig.13 ) is greater than the width w1 of the rectangular T-shaped protrusion 12, but less than the length h1 of the rectangular T-shaped protrusion 12, so as to prevent the rectangular T-shaped protrusion 12 from rotating more than 90° between the inner planes 32 of the two arc column plates 3; the width w3 of the rectangular opening groove 35 of the arc column plate 3 (see Fig. 9 ) is greater than the width w1 of the rectangular T-shaped protrusion 12.

[0067] Please refer to Fig.17 and Fig.19 The screw nut 5 is connected to the thread 11 of the screw 1 through an internal thread and abuts against the top of the cross beam 6. An external hexagonal portion for transmitting torque is provided on the outer periphery. The outer diameter of the screw nut 5 is larger than the diameter d6 of the center hole 61 of the cross beam 6.

[0068] The screw nut 5 rotates and relies on the cross beam 6, pulling the screw 1 upward through the thread 11, and the rectangular T-shaped protrusion 12 at the lower end of the screw 1 pushes the arc column plate 3 to hook the bushing C upward, overcoming the interference friction between the small-diameter sleeve C2 and the small hole B2, and removing the bushing C from the pilot oil injector mounting hole B of the cylinder head A.

[0069] The specific process of the method for disassembling the liner of the pilot oil injector of a marine dual-fuel diesel engine of the present invention is as follows:

[0070] 1) Use the bolts 4 to connect the two arc column plates 3 to the bottom of the disk 2. Fig.12 and Fig.13 , and first loosen the bolt 4 on one of the arc column plates 3, so that the arc column plate 3 is in a natural drooping state under the action of gravity, so as to ensure that the large ends of the two parallel arc column plates 3 can still pass through the inner hole of the bushing C at the same time;

[0071] 2) Place the two connected circular arc plates 3 and disc 2 into the bushing C from above the pilot oil injector mounting hole B of the cylinder head A, with the circular arc plate 3 facing downward. Fig.18 , so that the disk 2 is fitted on the upper side of the large diameter sleeve C1 of the bushing C, and the arc bosses 34 at the lower ends of the two arc column plates 3 pass through the inner hole of the small diameter sleeve C2 and extend out of the bottom end of the small diameter sleeve C2;

[0072] 3) Tighten the bolts 4 so that the arc surfaces 31 of the two arc cylindrical plates 3 are on the same circumference and fit with the inner hole of the small-diameter sleeve C2, and the diameter (2r31) of the circumference of the arc surface 31 is equal to the inner diameter of the small-diameter sleeve C2. At the same time, the upper end surfaces of the arc bosses 34 of the two arc cylindrical plates 3 fit with the lower end surface of the small-diameter sleeve C2, hooking the lower end of the bushing C from both sides, and the outer circumferences of the arc bosses 34 of the two arc cylindrical plates 3 are on the same circumference, and the diameter of the circumference of the outer circumference of the arc bosses 34 is greater than the inner diameter of the small-diameter sleeve C2, but smaller than the outer diameter of the small-diameter sleeve C2;

[0073] 4) Fix the crossbeam 6 to the cylinder head A above the opening of the pilot oil injector mounting hole B through the fixing bolts 7 and the screw holes F;

[0074] 5) Screw the screw nut 5 into the upper part of the screw 1, and with the rectangular T-shaped protrusion 12 facing downward, move the screw 1 from the top of the pilot oil injector mounting hole B of the cylinder head A through the center hole 61 of the crossbeam 6, the rectangular hole 21 of the disc 2, and the inner hole of the bushing C between the two arc column plates 3 from top to bottom, so that the rectangular T-shaped protrusion 12 extends out from the bottom of the arc boss 34 of the arc column plate 3. Fig.18 ;

[0075] 6) Please refer to Fig.19 , rotating the screw rod 1 so that the rectangular T-shaped protrusion 12 is simultaneously embedded in the rectangular opening groove 35 on the lower end surfaces of the two arc column plates 3;

[0076] 7) Rotate the screw nut 5 close to the cross beam 6, pull the screw 1 upward through the thread 11, and the rectangular T-shaped protrusion 12 at the lower end of the screw 1 hooks the bushing C through the arc boss 34 of the arc column plate 3, overcome the interference friction between the small diameter sleeve C2 and the small hole B2, and pull out the bushing C, thereby completing the installation of the disassembly tool from the top of the cylinder head A and realizing the disassembly operation of the bushing of the pilot oil injector.

[0077] The present invention can remove the bushing without removing the cylinder head from the main engine, which greatly improves the efficiency of the operation, saves the maintenance time of the marine dual-fuel main engine, and meets the requirements of reducing production costs and ensuring product quality.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be within the technical scope of the present invention.

Claims

1. A disassembly tool for a pilot oil injector bushing of a marine dual-fuel diesel engine, wherein the bushing is installed in a pilot oil injector mounting hole of a cylinder head, a small hole is provided at the bottom of the pilot oil injector mounting hole, the bushing comprises a large-diameter sleeve and a small-diameter sleeve connected to each other, the small-diameter sleeve forms an interference fit with the small hole, and a screw hole for mounting the pilot oil injector is provided on the top of the cylinder head; characterized in that: The disassembly tooling includes a crossbeam, fixing bolts, a disc, two arc column plates, bolts, a screw and a screw nut; The crossbeam is fixed to the cylinder head above the orifice of the pilot oil injector mounting hole through the fixing bolts and screw holes, and a center hole for passing the screw rod is provided in the center of the crossbeam; The disc is horizontally attached to the upper part of the large diameter sleeve of the bushing, and the disc is provided with a centrally symmetrical rectangular hole for passing the screw rod; The arc column plate is a stepped small semi-cylindrical rod, with an inner plane on the inside and an arc surface on the outside, an arc boss on the lower end, and a rectangular opening groove on the lower end surface; the two arc column plates are connected to the bottom of the disc by the bolts and pass through the inner hole of the bushing, and the lower ends extend out of the bottom end of the small-diameter sleeve, and the bushing is hooked and pulled from both sides by the arc boss; the two arc column plates are relatively and symmetrically distributed on both sides of the rectangular hole of the disc with the inner plane, the arc surfaces of the two arc column plates are on the same circumference and fit with the inner hole of the small-diameter sleeve, and the outer circumferences of the arc bosses of the two arc column plates are on the same circumference and the upper end surfaces fit with the lower end surface of the small-diameter sleeve; The screw rod is a round rod-type component, with a thread on the outer circumference and a rectangular T-shaped protrusion on the lower end. The length of the rectangular T-shaped protrusion is greater than the diameter of the screw rod. The screw rod passes through the center hole of the crossbeam, the rectangular hole of the disc and the inner hole of the bushing between the two arc column plates from top to bottom in sequence. The rectangular T-shaped protrusion at the lower end extends out from the bottom of the arc boss and is embedded in the rectangular opening grooves of the two arc column plates at the same time. The screw nut is screwed to the upper part of the screw and abuts against the upper surface of the crossbeam.

2. The disassembly tool for the marine dual-fuel diesel engine pilot oil injector bushing according to claim 1 is characterized in that: Connecting holes for connecting the arc column plate are symmetrically provided on both sides of the rectangular hole of the disc.

3. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The outer diameter of the disc is larger than the inner diameter of the large-diameter sleeve and smaller than or equal to the outer diameter of the large-diameter sleeve.

4. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The diameter of the circle where the arc surface is located is equal to the inner diameter of the small-diameter sleeve, and the diameter of the circle where the outer periphery of the arc boss is located is larger than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve.

5. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The arc column plates must at least meet the following minimum condition: the sum of the maximum distances between the inner planes and the outer peripheries of the arc bosses on the two arc column plates is smaller than the inner diameter of the small-diameter sleeve.

6. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The diameter of the central hole of the crossbeam is larger than the diagonal distance of the rectangular T-shaped protrusion and smaller than the outer diameter of the screw nut.

7. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The length of the rectangular T-shaped protrusion is smaller than the length of the rectangular hole of the disk, and the width of the rectangular T-shaped protrusion is smaller than the width of the rectangular hole of the disk and the width of the rectangular opening groove of the arc column plate.

8. The disassembly tool for the pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 1 is characterized in that: The distance between the inner planes of the two arc column plates is greater than the width of the rectangular T-shaped protrusion, but less than the length of the rectangular T-shaped protrusion.

9. A method for disassembling a pilot oil injector bushing for a marine dual-fuel diesel engine using the disassembly tool described in claim 1, characterized in that: The screw nut is rotated to pull the screw upward through the thread, and the rectangular T-shaped protrusion of the screw hooks the bushing through the circular arc boss of the circular arc column plate, overcoming the interference friction between the small diameter sleeve and the small hole, and pulling the bushing out of the pilot oil injector mounting hole, thereby completing the installation of the disassembly tool from the top of the cylinder head and realizing the disassembly operation of the pilot oil injector bushing.

10. The method for disassembling a pilot oil injector bushing of a marine dual-fuel diesel engine according to claim 9, characterized in that: The disassembly method comprises the following specific steps: 1) Use the bolts to connect the two arc cylindrical plates to the bottom of the disc, first loosen the bolts on one of the arc cylindrical plates, so that the arc cylindrical plate is in a natural drooping state under the action of gravity, so as to ensure that the large ends of the two parallel arc cylindrical plates can still pass through the inner hole of the bushing at the same time; 2) Place the two connected circular arc columns and the disc into the bushing from above the pilot oil injector mounting hole of the cylinder head with the circular arc columns facing downward, so that the disc fits above the large-diameter sleeve of the bushing, and the circular arc bosses at the lower ends of the two circular arc columns pass through the inner hole of the small-diameter sleeve and extend out of the bottom end of the small-diameter sleeve; 3) Tighten the bolts so that the arc surfaces of the two arc cylindrical plates are on the same circumference and fit with the inner hole of the small-diameter sleeve, and the diameter of the circumference of the arc surface is equal to the inner diameter of the small-diameter sleeve. At the same time, the upper end surfaces of the arc bosses of the two arc cylindrical plates fit with the lower end surface of the small-diameter sleeve, hooking the lower end of the bushing from both sides, and the outer circumferences of the arc bosses of the two arc cylindrical plates are on the same circumference, and the diameter of the circumference of the outer circumference of the arc boss is greater than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve; 4) fixing the crossbeam to the cylinder head above the orifice of the pilot oil injector mounting hole through the fixing bolts and screw holes; 5) Screw the screw nut into the upper part of the screw, and with the rectangular T-shaped protrusion facing downward, move the screw from above the pilot oil injector mounting hole of the cylinder head, through the center hole of the crossbeam, the rectangular hole of the disc, and the inner hole of the bushing between the two arc column plates from top to bottom, so that the rectangular T-shaped protrusion extends out from the bottom of the arc boss of the arc column plate; 6) rotating the screw rod so that the rectangular T-shaped protrusion is simultaneously embedded in the rectangular opening grooves on the lower end surfaces of the two arc column plates; 7) Rotate the screw nut to close against the cross beam, and pull the screw upward through the thread. The rectangular T-shaped protrusion at the lower end of the screw hooks the bushing through the arc boss of the arc column plate, overcomes the interference friction between the small-diameter sleeve and the small hole, and pulls out the bushing, thereby completing the installation of the disassembly tool from the top of the cylinder head and realizing the disassembly operation of the bushing of the pilot oil injector.

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