Lifting device for exhaust valve assembly of eccentric cylinder cover

Abstract

The invention discloses a lifting tool for an eccentric cylinder cover exhaust valve assembly. The lifting tool comprises a body, a guide pin, a fixing bolt and a lifting bolt. The body is positioned through the guide pin and fixed to the exhaust valve assembly, and the lifting hole is eccentrically arranged to balance center-of-gravity shift. Parallel lifting is achieved through a single lifting point, the structure is simple, universality is high, the problems that traditional multi-lifting-point operation is complex and potential safety hazards exist are effectively solved, and the device is suitable for the field of diesel engine cylinder cover assembling.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine assembly, and particularly relates to a lifting tool for an eccentric cylinder head exhaust valve assembly of a diesel engine, and is especially suitable for solving the technical problem that the center of gravity of the exhaust valve assembly is shifted due to a gas control block in a high-pressure dual-fuel diesel engine, resulting in the inability to achieve single-point parallel lifting. Background Art

[0002] Due to the integrated gas control block design of the cylinder head exhaust valve assembly of a high-pressure dual-fuel diesel engine, the center of gravity of the assembly structure deviates from the central axis. The traditional lifting method relies on the top lifting ring screw as the main lifting point, and multiple auxiliary lifting points need to be added to balance the center of gravity shift. However, such methods have the following significant defects:

[0003] 1. Complex operation: Multiple lifting points need to be adjusted in coordination, and the installation and disassembly are time-consuming and laborious. Moreover, the positions of the auxiliary lifting points are limited by the cylinder head structure and are difficult to arrange flexibly;

[0004] 2. Safety hazards: Manual adjustment is prone to causing oblique pulling and lifting, resulting in the risk of the assembly tilting or falling, threatening the safety of operating personnel;

[0005] 3. Insufficient accuracy: The auxiliary lifting points cannot completely offset the center of gravity shift, and it is difficult to ensure the parallelism of the assembly during the lifting process, affecting the subsequent assembly accuracy;

[0006] 4. Poor versatility: The traditional tooling has low adaptability, and special lifting tools need to be customized for different specifications of cylinder heads, increasing production costs.

[0007] Although some improvement schemes attempt to alleviate the above problems by increasing the number of lifting points or adjusting the lifting angle, none of them fundamentally solve the contradiction between single-point lifting and center of gravity balance. Therefore, there is an urgent need for a special tooling with a simple structure, strong versatility and capable of achieving parallel lifting through a single lifting point to improve the efficiency and safety of diesel engine cylinder head assembly. Summary of the Invention

[0008] The purpose of the present invention is to overcome the above deficiencies in the existing operation process and design a lifting device for an eccentric cylinder head exhaust valve assembly. This device can directly lift with a single lifting point during the lifting process of a high-pressure dual-fuel diesel engine, solving the problem that the cylinder head exhaust valve assembly currently needs to use multiple points and manual oblique pulling during the lifting process, and achieving the parallel lifting of the cylinder head gas valve assembly. It has a simple structure, convenient operation and high safety.

[0009] The technical solution of the present invention:

[0010] A lifting tool for an eccentric cylinder head exhaust valve assembly, characterized in that it includes:

[0011] A body, made of high-strength alloy steel plate, in a rectangular plate structure, and fixed holes and lifting holes are provided on the body;

[0012] The guide pin is vertically fixed on one side of the body and is in clearance fit with the reserved hole position of the exhaust valve assembly for positioning the exhaust valve assembly, and the end of the guide pin is a conical guiding structure;

[0013] The lifting bolt is installed in the lifting hole to form a single lifting point, and a safety pin hole is provided at the top;

[0014] Among them, the fixing bolt fastens the body to the exhaust valve assembly through the fixing hole, and the center of the lifting hole deviates from the geometric center of the body, and the eccentricity

[0015] e satisfies the following formula:

[0016]

[0017] Among them, w is the weight of the gas control block, d is the horizontal distance from the center of gravity of the gas control block to the center of the exhaust valve assembly, and G is the self-weight of the assembly.

[0018] Preferably, the body is a modular detachable structure, including a replaceable hole module and a telescopic side plate, which are adapted to exhaust valve assemblies of different specifications. The thickness of the body is 15-20 mm, and the surface is treated with rust prevention.

[0019] Preferably, the fixing bolt is an 8.8-grade high-strength bolt, and the installation torque is 50-60 N·m, and it is tightened in two steps in a diagonal order.

[0020] Preferably, the edge of the body is provided with anti-slip lines, and a safety pin must be inserted into the safety pin hole of the lifting bolt before lifting.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Realize parallel lifting through a single lifting point, without the need for auxiliary lifting points, and simplify the operation;

[0023] 2. The guide pin and the fixing bolt cooperate to ensure the installation stability of the tooling;

[0024] 3. The eccentric structure design has strong versatility and is adapted to various cylinder head specifications;

[0025] 4. Avoid manual adjustment, eliminate the risk of skewed lifting, and improve safety. Brief Description of the Drawings

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

[0027] Figure 2 It is a side view of the eccentric lifting tool assembly.

[0028] Figure 3 It is a front view of the eccentric lifting tool assembly.

[0029] Figure 4 It is the front view of the main body.

[0030] Figure 5 It is the side view of the main body.

[0031] Figure 6 It is the top view of the main body.

[0032] Description of reference numerals in the figure:

[0033] 1 - Eccentric lifting tool 2 - Exhaust valve assembly 3 - Gas control block

[0034] 4 - Cylinder head assembly 5 - Lifting bolt 6 - Fixing bolt

[0035] 7 - Lifting hole 8 - Guide pin 9 - Fixing hole Specific implementation mode

[0036] Next, we will further elaborate on the present invention in conjunction with the attached drawings and specific implementations:

[0037] Please look Figure 1 , Figure 1 is a lifting schematic diagram of a lifting scheme for an eccentric cylinder head exhaust valve assembly. The conventional exhaust valve assembly 2 and the cylinder head assembly 4 are symmetrical structures. When lifting, directly using the lifting point at the center of the exhaust valve assembly 2 can meet the usage requirements. However, due to the structure of the gas control block 3 on the cylinder head exhaust valve assembly of the high-pressure dual-fuel diesel engine, the center of gravity of the cylinder head exhaust valve assembly is not at the center of the exhaust valve assembly 2, and it cannot be directly lifted through the center lifting point of the exhaust valve assembly 2. Therefore, it is necessary to install an eccentric lifting tool 1 on the exhaust valve assembly 2 and directly lift it through the eccentric lifting tool 1.

[0038] Please look Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 2 is the side view of the eccentric lifting tool assembly, Figure 3 is the front view of the eccentric lifting tool assembly, Figure 4 is the front view of the main body of the present invention, Figure 5 is the side view of the main body of the present invention, Figure 6 is the top view of the main body of the present invention. When the eccentric lifting tool 1 is in use, it is positioned on the exhaust valve assembly 2 through the guide pin 8, and the eccentric lifting tool 1 is fixed on the exhaust valve assembly 2 using 4 fixing bolts 6. The lifting bolt 5 is installed on the exhaust valve assembly 2 through the fixing hole 9. When lifting the cylinder head exhaust valve assembly, it can be directly lifted through the lifting hole 7 on the eccentric lifting tool 1, which can directly meet the requirement of parallel lifting of the high-pressure dual-fuel cylinder head exhaust valve assembly.

[0039] The following are the installation and usage steps of the present invention:

[0040] Step 1: Pre-assembly of the tooling and adaptation adjustment

[0041] Select the body 1 with the corresponding size according to the model of the cylinder head exhaust valve assembly 2. If it is necessary to adapt to non-standard specifications, it can be achieved by adjusting the telescopic side plates of the modular body or replacing the hole position module.

[0042] Check the clearance between the guide pin 8 and the positioning hole of the exhaust valve assembly to ensure no jamming.

[0043] Step 2: Positioning and fixing the tooling

[0044] As Figure 2 shown, align the guide pin 8 with the reserved hole position of the exhaust valve assembly 2 and slowly insert it until the body 1 fits the surface of the assembly.

[0045] Use a torque wrench to tighten the fixing bolts 6 in two passes in a diagonal order. First, pre-tighten to 25 N·m, and then finally tighten to 50 - 60 N·m for the second time.

[0046] Step 3: Install the lifting bolt

[0047] Pass the lifting bolt 5 through the lifting hole 7, and install a flat washer and a spring washer at the threaded end to prevent loosening.

[0048] Tighten the lifting bolt to the specified torque (80 - 100 N·m) and insert a safety pin to lock it.

[0049] Step 4: Lifting operation

[0050] As Figure 1 shown, connect the hook of the lifting equipment to the lifting bolt 5 to ensure that the lifting rope is vertical and without deviation.

[0051] Slowly lift the lifting equipment and observe whether the cylinder head assembly 4 remains horizontal. If it is slightly tilted, the center of gravity can be automatically balanced by fine-tuning the lifting speed or pausing briefly.

[0052] Step 5: Disassembly and maintenance

[0053] After the lifting is completed, disassemble the fixing bolts 6 and the guide pin 8 in reverse order.

[0054] Regularly check the wear condition of the body 1, especially the bushing of the lifting hole. If the wear amount exceeds 1 mm, it needs to be replaced in time.

[0055] The present invention is applicable to cylinder heads of different specifications and can be made universal only by adjusting the size of the body, greatly improving the assembly efficiency.

Claims

1. A lifting tool for an eccentric cylinder head exhaust valve assembly, characterized in that: include: The body (1) is made of a high-strength alloy steel plate and has a rectangular plate structure. The body (1) is provided with a fixing hole (9) and a lifting hole (7); A guide pin (8) is vertically fixed to one side of the body (1) and is clearance-matched with a reserved hole of the exhaust valve assembly (2) to position the exhaust valve assembly (2), and the end of the guide pin (8) is a conical guide structure; A lifting bolt (5) is installed in the lifting hole (7) to form a single lifting point, and a safety pin hole is provided on the top; The fixing bolt (6) fastens the body (1) to the exhaust valve assembly (2) through the fixing hole (9), and the center of the lifting hole (7) deviates from the geometric center of the body (1), and the eccentricity e satisfies the following formula: Wherein, w is the weight of the gas control block (3), d is the horizontal distance from the center of gravity of the gas control block to the center of the exhaust valve assembly, and G is the deadweight of the assembly.

2. The lifting tool for the eccentric cylinder head exhaust valve assembly according to claim 1 is characterized in that: The body (1) is a modular detachable structure, including a replaceable hole module and a telescopic side plate, adapted to cylinder head exhaust valve assemblies of different specifications, the body thickness is 15-20 mm, and the surface is rust-proofed.

3. The lifting tool for the eccentric cylinder head exhaust valve assembly according to claim 1 is characterized in that: The fixing bolts (6) are 8.8-grade high-strength bolts with an installation torque of 50-60 N·m, and are tightened twice in diagonal order.

4. The lifting tool for the eccentric cylinder head exhaust valve assembly according to claim 1, characterized in that: The edge of the main body (1) is provided with anti-skid patterns, and the safety pin hole of the lifting bolt (5) needs to be inserted with the safety pin before lifting.

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