Diesel engine cooling water jacket disassembly tool and disassembly method

Abstract

The present invention discloses a disassembly tool and method for a diesel engine cooling water jacket. The tool comprises a chassis, several support rods, two double-headed screws and two bolt tensioners. Several support rods are vertically fixed on the chassis, two double-headed screws are located between the support rods, and the lower ends of the double-headed screws are respectively fixed on the chassis. The bottom of the cooling water jacket in the combustion chamber component to be disassembled is supported on the chassis. The upper through holes of the cooling water jacket are respectively inserted into the corresponding upper ends of the double-headed screws, and the bolt tensioners are respectively screwed on the upper ends of the double-headed screws, and the lower end faces thereof are respectively against the upper end faces of the cooling water jacket. The disassembly method comprises 1) cleaning the oil passage holes of the cooling water jacket and blocking the orifice ends, 2) tightening the bolt tensioners on the upper ends of the double-headed screws, and 3) completing the disassembly of the cooling water jacket by multiple pressurization and unloading of the bolt tensioners. The present invention greatly improves the disassembly efficiency of the diesel engine combustion chamber components and reduces the disassembly cost of the diesel engine combustion chamber components.

Description

Technical Field

[0001] The invention relates to a disassembly tool for diesel engine parts, in particular to a disassembly tool and method for combustion chamber parts of a diesel engine, belonging to the technical field of diesel engine maintenance. Background Art

[0002] The combustion chamber components of a diesel engine are composed of a cylinder liner, a cooling water jacket and a flame ring. They are components that work in harsh working environments with high temperature, high pressure and high corrosion. They are also critical components for the explosion of diesel engines and are key maintenance components. According to the diesel engine maintenance technical specifications, the combustion chamber components of an L32 marine diesel engine must be repaired and maintained after the diesel engine has worked for 6,000 hours. The combustion chamber components must be disassembled into three independent parts: the cylinder liner, the cooling water jacket and the flame ring. The combustion chamber, which has worked for 6,000 hours in a high temperature, high pressure and high corrosion working environment, has severe internal corrosion and cannot be disassembled and assembled by conventional means. Summary of the invention

[0003] The purpose of the present invention is to provide a diesel engine cooling water jacket disassembly tool and disassembly method which has a simple structure and can conveniently and quickly disassemble a combustion chamber of a diesel engine.

[0004] The present invention is achieved through the following technical solutions:

[0005] A diesel engine cooling water jacket disassembly tool comprises a chassis, several support rods, two double-headed screw rods and two bolt tensioners, wherein the several support rods are evenly distributed vertically on the chassis, the tops of the support rods are padded with sleepers, and the bottoms of the support rods are respectively fixedly connected vertically to the chassis; the two double-headed screw rods arranged diagonally are located between the support rods, and the lower ends of the double-headed screw rods are respectively screwed into corresponding threaded holes in the chassis; the bottom of the cylinder liner in the combustion chamber component to be disassembled, which is composed of a cooling water jacket, a cylinder liner and a flame ring, is supported on the chassis by several soft plates; the upper through holes of the cooling water jacket are respectively inserted into the corresponding upper ends of the double-headed screw rods, the bolt tensioners are respectively screwed on the upper ends of the double-headed screw rods, and the lower end faces of the bolt tensioners are respectively against the upper end faces of the cooling water jacket.

[0006] The purpose of the present invention can also be further achieved by the following technical measures:

[0007] Furthermore, the center distribution circle diameter D of the two double-headed screws matches the center distribution circle diameter D1 of the upper through hole of the cooling water jacket.

[0008] Furthermore, the soft board is made of copper.

[0009] Furthermore, the double-headed screw is made of medium carbon steel, and the tempered hardness of the double-headed screw is HB250-290.

[0010] Furthermore, the ratio of the distance H1 from the bottom surface of the cooling water jacket to the bottom surface of the cylinder jacket to the distance H2 from the upper side surface of the sleeper at the top of the support rod to the bottom surface of the cylinder jacket is: H1 / H2=1.21-1.23.

[0011] A method for disassembling a diesel engine cooling water jacket using a tool comprises the following steps:

[0012] 1) First, clean the surface of the combustion chamber parts removed from the diesel engine to remove the surface oil and rust residue. At the same time, pass compressed air into the oil channel holes on the side of the cooling water jacket to remove the impurities inside.

[0013] 2) Then clean the oil channel hole of the cooling water jacket, use No. 0 diesel to fill the oil channel hole of the cooling water jacket for cleaning, and after cleaning and filling with No. 0 diesel, seal the oil channel hole with a plug to allow No. 0 diesel to penetrate, soak and lubricate the joint surface between the cylinder liner and the cooling water jacket, as well as the joint surface between the cylinder liner and the flame ring;

[0014] 3) Install the combustion chamber components onto the diesel engine cooling water jacket disassembly tooling, first hoist the combustion chamber components onto the chassis, so that the bottom of the cylinder liner is supported on several soft plates on the upper side of the chassis to prevent the chassis from damaging the bottom of the cylinder liner; then, the lower ends of the double-headed screws are respectively passed through the two upper through holes of the cooling water jacket on the diagonal line of the cooling water jacket and then screwed into the threaded holes of the chassis, and sleepers are respectively placed on the top of the support rods, which play a role in buffering and protecting the cooling water jacket when the cooling water jacket falls off the sleepers on the top of the support rods;

[0015] 4) Install the bolt tensioner, use the bolt tensioner to disassemble the cooling water jacket, and tighten the bolt tensioner on the upper end of the stud screw so that the bottom surface of the bolt tensioner is pressed against the top surface of the cooling water jacket;

[0016] 4.1) Start the hydraulic oil pump to pressurize the bolt tensioner to elastically stretch the double-headed screw, and stabilize the oil pressure of the bolt tensioner in the range of 14MPa to 15.5MPa; then observe whether there is a gap between the upper end surface of the cooling water jacket and the bottom surface of the bolt tensioner. If there is a gap, re-tighten the bolt tensioner and then release the pressure of the hydraulic oil pump. The reset impact force generated instantly after the elastic force of the double-headed screw stretching disappears pushes the cooling water jacket downward;

[0017] 4.2) If the cooling water jacket has been moved down, repeat step 4.1) 3 to 4 times until the cooling water jacket moves down completely away from the flame ring and cylinder liner and falls on the sleepers on top of several support rods; lift away the flame ring, cylinder liner and cooling water jacket separately to complete the removal of the cooling water jacket.

[0018] 4.3) If the cooling water jacket does not move down, it means that the cooling water jacket has not yet separated from the cylinder liner; use a copper rod to evenly knock on the top annular surface of the cooling water jacket to reduce the static friction of the fitting surfaces of each part through vibration; then repeat the process of 4.1) to 4.2) until the cooling water jacket moves down and completely separates from the flame ring and cylinder liner, and lift away the flame ring, cylinder liner and cooling water jacket, and the flame ring and cylinder liner separately to complete the removal of the cooling water jacket.

[0019] Furthermore, in step 2), the soaking time of No. 0 diesel is 24 hours.

[0020] The disassembly tooling of the present invention has a simple structure and a convenient and quick disassembly method. When the hydraulic oil pump is used to pressurize the bolt tensioner, the double-headed screw rod is elastically extended, thereby generating a gap between the bottom surface of the bolt tensioner and the top surface of the cooling water jacket. At this time, the hydraulic oil pump is unloaded after the bolt tensioner is tightened again. The reset impact force generated instantly when the tensile force of the double-headed screw rod suddenly disappears has a huge impact on the cooling water jacket, and after multiple impacts, the cooling water jacket is pushed downward. The present invention solves the problem of disassembling the diesel engine combustion chamber components, greatly improves the disassembly efficiency of the diesel engine combustion chamber components, and reduces the disassembly cost of the diesel engine combustion chamber components.

[0021] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the disassembly tool of the present invention;

[0023] Figure 2 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and an embodiment of the disassembly of the cooling water jacket of the combustion chamber of an L32 type marine diesel engine.

[0025] like Figure 1 and Figure 2 As shown, the diesel engine cooling water jacket disassembly tool of this embodiment includes a chassis 1, 4 support rods 2, 2 stud screws 3 and 2 bolt tensioners 4. The 4 support rods 2 with rectangular cross sections are vertically and evenly distributed on the chassis 1. The tops of the support rods 2 are padded with sleepers 21. The bottoms of the support rods 2 are vertically fixedly connected to the chassis 1 by several fastening screws. The two stud screws 3 arranged diagonally are located between the support rods 2, and the lower ends of the stud screws 3 are screwed into the corresponding threaded holes 11 of the chassis 1.

[0026] The combustion chamber components to be disassembled are composed of a cooling water jacket 10, a cylinder liner 20 and a flame ring 30, wherein the bottom of the cylinder liner 20 is supported on the chassis 1 by four copper plates 5, which can prevent the bottom of the cooling water jacket 10 from being damaged when it falls. The upper through holes 101 of the cooling water jacket are respectively inserted into the upper ends of the corresponding double-headed screws 3, and the bolt tensioners 4 are respectively screwed on the upper ends of the double-headed screws 3, and the lower end faces of the bolt tensioners 4 are respectively against the upper end faces of the cooling water jacket 10. Since the double-headed screw 3 is made of medium carbon steel, its tempered hardness is HB250-290, so that it has good elasticity. After the double-headed screw 3 is pressurized by the bolt tensioner 4 threadedly connected to it, it elastically extends, so that a gap is generated between the bottom surface of the bolt tensioner 4 and the top surface of the cooling water jacket 10, and the bolt tensioner 4 can be tightened again; after the hydraulic oil pump is unloaded, the elastic extension of the double-headed screw suddenly disappears and the instantaneous reset impact force has a huge impact on the cooling water jacket 10. Under the multiple impacts generated by the repeated loading-unloading cycles of the hydraulic oil pump, the cooling water jacket 10 moves down until it is separated from the cylinder liner 20, thereby solving the problem of disassembling the cooling water jacket 10.

[0027] The center distribution circle diameter D of the two double-headed screws 3 matches the center distribution circle diameter D1 of the upper through hole 101 of the cooling water jacket. It is convenient for the cooling water jacket 10 to be sleeved on the two double-headed screws 3. The ratio of the distance H1 from the bottom surface of the cooling water jacket 10 to the bottom surface of the cylinder jacket and the distance H2 from the upper side of the sleeper 21 at the top of the support rod 2 to the bottom surface of the cylinder jacket 20 is: H1 / H2=1.21~1.23, and the ratio is 1.22 in this embodiment, which is convenient for disassembling the lower end cooling water jacket 10 and dropping it onto the sleeper 21 at the top of the support rod 2.

[0028] A method for disassembling a diesel engine cooling water jacket using a tool comprises the following steps:

[0029] 1) First, clean the surface of the combustion chamber components removed from the diesel engine to remove surface oil stains and rust residues. At the same time, introduce compressed air into the oil channel hole 102 on the side of the cooling water jacket to remove impurities inside.

[0030] 2) Then clean the cooling water jacket oil passage hole 102, use No. 0 diesel to fill the cooling water jacket oil passage hole 102 for cleaning, and after cleaning and filling with No. 0 diesel, seal the opening of the oil passage hole 102 with a plug 103, so that the No. 0 diesel penetrates, soaks and lubricates the joint surface between the cylinder liner 20 and the cooling water jacket 10, and the joint surface between the cylinder liner 20 and the flame ring 30. The soaking time of No. 0 diesel is 24 hours.

[0031] 3) Install the combustion chamber components on the diesel engine cooling water jacket disassembly tool, first lift the combustion chamber components onto the chassis 1, so that the bottom of the cylinder liner 20 is supported on the four copper plates 5 on the upper side of the chassis 1 to prevent the bottom of the cylinder liner 20 from being damaged. Then, the lower ends of the double-headed screws 3 pass through the two cooling water jacket upper through holes 101 on the diagonal line of the cooling water jacket and then screw into the chassis threaded holes 11, and place sleepers 21 on the top of the support rods 2, respectively, to buffer and protect the cooling water jacket 10 when it falls off the sleepers 21 at the top of the support rods 2.

[0032] 4) Install the bolt tensioner 4, use the bolt tensioner 4 to dismantle the cooling water jacket 10, and tighten the bolt tensioner 4 on the upper end of the double-headed screw 3 respectively, so that the bottom surface of the bolt tensioner 4 is pressed against the top surface of the cooling water jacket 10.

[0033] 4.1) Start the hydraulic oil pump to pressurize the bolt tensioner 4 to elastically stretch the double-headed screw 3, and stabilize the oil pressure of the bolt tensioner 4 in the range of 14MPa to 15.5MPa. Then observe whether there is a gap between the upper end surface of the cooling water jacket 10 and the bottom surface of the bolt tensioner 4. If there is a gap, re-tighten the bolt tensioner 4 and then release the pressure of the hydraulic oil pump. The reset impact force generated instantly after the elastic force of the double-headed screw 3 disappears pushes the cooling water jacket 10 downward.

[0034] 4.2) If the cooling water jacket 10 has been moved down, repeat step 4.1) 3-4 times until the cooling water jacket 10 moves down completely away from the flame ring 30 and the cylinder liner and falls on the sleepers 21 at the top of the four support rods 2. The flame ring, cylinder liner and cooling water jacket 10 are lifted and removed respectively to complete the disassembly of the cooling water jacket.

[0035] 4.3) If the cooling water jacket 10 does not move downward, it means that the cooling water jacket 10 has not yet separated from the cylinder liner 20. Use a copper rod to evenly knock the top annular surface of the cooling water jacket 10 to reduce the static friction of the fitting surfaces of each part through vibration, and then repeat the process of 4.1) to 4.2) until the cooling water jacket 10 moves downward and completely separates from the flame ring 30 and the cylinder liner 20; lift the flame ring 30, cylinder liner 20 and cooling water jacket 10 away respectively to complete the disassembly of the cooling water jacket 10.

[0036] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for using a disassembly tool for a cooling water jacket of a diesel engine, the disassembly tool comprising a chassis, several support rods, two double-headed screw rods and two bolt tensioners, wherein the several support rods are evenly distributed vertically on the chassis, the tops of the support rods are padded with sleepers, and the bottoms of the support rods are respectively vertically fixedly connected to the chassis; the two double-headed screw rods arranged diagonally are located between the support rods, and the lower ends of the double-headed screw rods are respectively screwed into the corresponding threaded holes of the chassis; the bottom of the cylinder liner in the combustion chamber component to be disassembled, which is composed of a cooling water jacket, a cylinder liner and a flame ring, is supported on the chassis by several soft plates; the upper through holes of the cooling water jacket are respectively inserted into the corresponding upper ends of the double-headed screw rods, the bolt tensioners are respectively screwed on the upper ends of the double-headed screw rods, and the lower end faces of the bolt tensioners are respectively against the upper end faces of the cooling water jacket; The center distribution circle diameter D of the two double-headed screws matches the center distribution circle diameter D1 of the upper through hole of the cooling water jacket; The ratio of the distance H1 from the bottom of the cooling water jacket to the bottom of the cylinder liner to the distance H2 from the upper side of the sleeper at the top of the support rod to the bottom of the cylinder liner is: H1 / H2 = 1.21 ~ 1.23; Features: The method of use includes the following steps: 1) First, clean the surface of the combustion chamber parts removed from the diesel engine to remove the surface oil and rust residue. At the same time, pass compressed air into the oil channel holes on the side of the cooling water jacket to remove the impurities inside. 2) Then clean the oil channel hole of the cooling water jacket, use No. 0 diesel to fill the oil channel hole of the cooling water jacket for cleaning, and after cleaning and filling with No. 0 diesel, seal the oil channel hole with a plug to allow No. 0 diesel to penetrate, soak and lubricate the joint surface between the cylinder liner and the cooling water jacket, as well as the joint surface between the cylinder liner and the flame ring; 3) Install the combustion chamber components onto the diesel engine cooling water jacket disassembly tooling, first hoist the combustion chamber components onto the chassis, so that the bottom of the cylinder liner is supported on several soft plates on the upper side of the chassis to prevent the chassis from damaging the bottom of the cylinder liner; then, the lower ends of the double-headed screws are respectively passed through the two upper through holes of the cooling water jacket on the diagonal line of the cooling water jacket and then screwed into the threaded holes of the chassis, and sleepers are respectively placed on the top of the support rods, which play a role in buffering and protecting the cooling water jacket when the cooling water jacket falls off the sleepers on the top of the support rods; 4) Install the bolt tensioner, use the bolt tensioner to disassemble the cooling water jacket, and tighten the bolt tensioner on the upper end of the stud screw so that the bottom surface of the bolt tensioner is pressed against the top surface of the cooling water jacket; 4.1) Start the hydraulic oil pump to pressurize the bolt tensioner to elastically stretch the double-headed screw, and stabilize the oil pressure of the bolt tensioner in the range of 14MPa to 15.5MPa; then observe whether there is a gap between the upper end surface of the cooling water jacket and the bottom surface of the bolt tensioner. If there is a gap, re-tighten the bolt tensioner and then release the pressure of the hydraulic oil pump. The reset impact force generated instantly after the elastic force of the double-headed screw stretching disappears pushes the cooling water jacket downward; 4.2) If the cooling water jacket has been moved down, repeat step 4.1) 3-4 times until the cooling water jacket is completely moved down and separated from the flame ring and cylinder liner, and falls on the sleepers on the top of several support rods; lift away the flame ring, cylinder liner and cooling water jacket respectively, and complete the disassembly of the cooling water jacket; 4.3) If the cooling water jacket does not move down, it means that the cooling water jacket has not yet separated from the cylinder liner; use a copper rod to evenly knock on the top annular surface of the cooling water jacket to reduce the static friction of the fitting surfaces of each part through vibration; then repeat the process of 4.1) to 4.2) until the cooling water jacket moves down and completely separates from the flame ring and cylinder liner; lift away the flame ring, cylinder liner and cooling water jacket separately to complete the removal of the cooling water jacket.

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