Dismounting device for cylinder cover valve seat of marine diesel engine

Abstract

The utility model relates to a dismounting device for a marine diesel engine cylinder cover valve seat, which comprises an actuating rod, a guide sleeve, a tensioning sleeve, a compression nut, a hollow hydraulic jack, a locking nut and a compression sleeve, the tensioning sleeve is arranged on the outer wall of the guide sleeve, the guide sleeve and the compression nut are respectively arranged at the actuating end of the actuating rod in a screw joint mode, and the hollow hydraulic jack is arranged on the hollow hydraulic jack. When the pressing nut is rotated, the pressing nut acts on the tensioning sleeve in the displacement direction generated by rotation, so that the tensioning sleeve moves along the outer wall of the guide sleeve and expands outwards along the moving track, the acting rod is sleeved with the pressing sleeve and the hollow hydraulic jack, and the hollow hydraulic jack is located on the upper sleeve wall of the pressing sleeve. The fastening end of the actuating rod is matched with a locking nut to fix the actuating rod and the hollow hydraulic jack. The hollow hydraulic jack is used as a power source, stable and uniform force is provided, the situation of damage caused by friction of structural parts is greatly reduced, and the perpendicularity and stability in the detaching process are guaranteed through the design of the guide column and the pressing sleeve.

Description

TECHNICAL FIELD

[0001] The utility model relates to a diesel engine assembly tooling technical field, concretely relates to a kind of dismounting device for marine diesel engine cylinder cover valve seat. BACKGROUND

[0002] A link in the daily maintenance and maintenance process of diesel engine needs to dismount exhaust valve seat of cylinder cover, since exhaust valve seat and cylinder cover are interference fit, traditional dismounting method usually relies on hammering, crowbar or heating method, not only cumbersome operation, time-consuming is longer, and cylinder cover and peripheral components are easily damaged, especially for the cylinder cover of precision machining, this rough disassembly mode can lead to cylinder cover deformation or even cracking.In addition, excessive heating can change the physical properties of metal material, resulting in subsequent assembly accuracy difficult to restore, seriously affect engine performance.For the drawbacks of traditional method, practitioners design the cylinder cover exhaust valve seat pull-out tool, utilize expansion sleeve to enter the inside of valve seat along screw rod, expansion sleeve tightens and clamps valve seat, and provides force in vertical direction to pull out valve seat.For example, the cylinder cover valve seat pull-out tool provided in the publication No.CN208867094U utilizes rotating screw rod to make screw rod move upwards, the component similar to expansion sleeve and installed at the lower end of screw rod tightens and forms self-locking with inner wall of valve seat, and valve seat is pulled out along with screw rod moving upwards.Defects are that when using, nut between fixed frame and screw rod is twisted by wrench, since it is the wear between metal parts, long-term use can cause damage, for example, thread damage, so that tool and valve seat are clamped on cylinder cover, need to be damaged, and valve seat is disassembled again, in addition, nut is twisted by wrench, and the force provided is impossible to control, and valve seat is unevenly stressed, which can cause damage to valve seat and cylinder cover valve seat opening. SUMMARY

[0003] For the above problems, the utility model provides a kind of dismounting device for marine diesel engine cylinder cover valve seat, and uniform upward force is provided to screw rod by hydraulic jack, to avoid the damage of structural component.

[0004] To achieve the above object, the following technical scheme is adopted: a kind of dismounting device for marine diesel engine cylinder cover valve seat, including action rod, guide sleeve, expansion sleeve, compression nut, hollow hydraulic jack, locking nut and compression sleeve,

[0005] One end of the action rod is the action end acting on the valve seat, the other end is the fastening end acting on the hollow hydraulic jack, wherein the action end and the fastening end are both threaded rods, the action end is two threaded, and a positioning boss is processed between the two threaded,

[0006] The tightening sleeve is installed on the outer wall of the guide sleeve, the contact surface of the two is a mutual matching inclined surface, the outer edge of the end surface of the guide sleeve is provided with a limiting boss for limiting the maximum displacement of the tightening sleeve, the guide sleeve and the compression nut are respectively installed on the bidirectional threaded rod of the action end through screwing, so that when the compression nut is rotated, the tightening sleeve is acted on along the displacement direction generated by the rotation, the tightening sleeve moves along the outer wall of the guide sleeve and expands outward along the moving track,

[0007] The lower end surface of the compression sleeve is a valve seat port for abutting the valve seat port of the cylinder cover, the center of the upper sleeve wall is provided with a through hole for the action rod, the compression sleeve and the hollow hydraulic jack are sleeved on the action rod, the hollow hydraulic jack is located on the upper sleeve wall of the compression sleeve and is guaranteed to be concentric with the compression sleeve, and the fastening end of the action rod is fixed with the hollow hydraulic jack through the cooperation of the locking nut.

[0008] Further, the threaded rod of the action end of the action rod is a bidirectional threaded rod, and the two sections of threads are positive and negative threads.

[0009] Further, the tightening sleeve is composed of four tightening blocks, the outer wall of the tightening block is an inclined surface matched with the inner wall of the valve seat, the outer edge of the end surface of the tightening block is processed into a clamping boss, the clamping boss and the inclined surface of the outer wall of the tightening block form a clamping groove, and the clamping groove is used for clamping the stress end surface of the valve seat.

[0010] Further, the distance between the valve seat port of the compression sleeve and the upper sleeve wall is greater than the axial height of the valve seat to be taken.

[0011] Further, the side wall of the compression sleeve is provided with an observation hole.

[0012] The utility model has the advantages that the hollow hydraulic jack is used as a power source to provide stable and uniform force, and the damage caused by the friction of structural parts is greatly reduced. The perpendicularity and stability during the dismounting process are ensured through the design of the guide column and the compression sleeve, and the four tightening blocks are combined to form the tightening sleeve, so that the adhesion of the tightening sleeve to the inner wall of the valve seat is higher, and the stability of the tightening sleeve in the valve seat is higher. DRAWINGS

[0013] Figure 1 It is a sectional view of the utility model;

[0014] Figure 2 It is a structural schematic view of the utility model;

[0015] Figure 3 It is an application schematic view of the utility model;

[0016] Figure 4 It is a schematic view of the tightening sleeve.

[0017] As shown in the figure: 1, the action rod; 2, the guide sleeve; 3, the tensioning sleeve; 4, the compression nut; 5, the hollow hydraulic jack; 6, the locking nut; 7, the compression sleeve; 8, the valve seat; 9, the cylinder cover; 200, the limiting boss; 300, the tensioning block; 301, the clamping groove; 700, the observation hole. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] The following further illustrates in conjunction with the accompanying drawings, as Figure 1 shown in Figure 2, a kind of for the dismounting device of marine diesel engine cylinder cover valve seat, including action rod 1, guide sleeve 2, tensioning sleeve 3, compression nut 4, hollow hydraulic jack 5, locking nut 6 and compression sleeve 7,

[0020] Wherein, the one end of action rod 1 is the action end for valve seat, the other end is the fastening end for hollow hydraulic jack 5, wherein the action end is bidirectional threaded rod, its two threads are positive and negative threads, and positioning boss is processed between two threads, and the fastening end is unidirectional threaded rod.

[0021] The outer wall of guide sleeve 2 is variable-diameter diffusion slope, and the outer diameter of the larger end surface of guide sleeve 2 is machined with limiting boss 200 for limiting the maximum displacement of tensioning sleeve 3,

[0022] As Figure 4 shown, tensioning sleeve 3 is combined by four petals tensioning block 300, the outer wall of tensioning block 300 is the slope that is adapted to the inner wall of valve seat 8, the end surface of tensioning block 300 is machined into clamping boss, and the clamping boss and the outer wall slope of tensioning block 300 form clamping groove 301, and clamping groove 301 is used for clamping the stress end surface of valve seat 8, and the inner wall of tensioning block 300 is the slope that is adapted to the outer wall of guide sleeve 2,

[0023] The lower end surface of compression sleeve 7 is valve seat port, for interfacing cylinder cover valve seat port, the through hole of action rod is provided in the center of upper cylinder wall, the distance between the valve seat port of compression sleeve 7 and the upper cylinder wall is greater than the axial height of the valve seat 8 to be taken out, so that the valve seat 8 can be smoothly taken out, and the side wall of compression sleeve 7 is provided with observation hole 700.

[0024] The assembly state of the dismounting device of the embodiment, tensioning sleeve 3 is installed on the outer wall of guide sleeve 2, guide sleeve 2 and compression nut 4 are respectively installed on the bidirectional threaded rod of action end by screwing, to ensure that when rotating compression nut 4, it acts on tensioning sleeve 3 along the displacement direction generated by rotation, so that tensioning sleeve 3 moves along the outer wall of guide sleeve 2 and expands outward along the moving track, compression sleeve 7 and hollow hydraulic jack 5 are sleeved on the action rod 1, hollow hydraulic jack 5 is located on the upper cylinder wall of compression sleeve 7, and it is ensured that it is concentric with compression sleeve 7, and the fastening end of action rod 1 is fixed with hollow hydraulic jack 5 by locking nut 6.

[0025] The application of the dismounting device of the embodiment in the dismounting of the cylinder head exhaust valve seat is shown in the figure Figure 3

[0026] 1) Assemble the guide sleeve 2 on the acting end of the acting rod 1, and extend the guide sleeve 2 into the center hole of the valve seat 8, assemble the expansion sleeve 3 on the guide sleeve 2, and at the same time, assemble the compression nut 4 on the acting end of the acting rod 1, and adjust the compression nut 4 to the free state, to ensure that the expansion sleeve 3 can smoothly enter the inside of the valve seat 8 without being blocked;

[0027] 2) Tighten the compression nut 4 step by step, and expand the expansion sleeve 3 outward along the inclined surface of the outer wall of the guide sleeve 2 by means of the extrusion force generated thereby, until the outer wall of the expansion sleeve 3 tightly fits the inner wall of the valve seat 8, and the clamping groove 301 of the expansion sleeve 3 clamps the stress end face of the valve seat 8, to form a firm gripping state;

[0028] 3) Install the compression sleeve 7 on the acting rod 1, and take the valve seat port to be in butt joint with the cylinder head valve seat port, to ensure the same concentricity with the valve seat 8;

[0029] 4) Assemble the hollow hydraulic jack 5 on the acting rod 1, and place it on the upper sleeve wall of the compression sleeve 7, and return the hollow hydraulic jack 5 to the initial state;

[0030] 5) Assemble the locking nut 6 on the fastening end of the acting rod 1, and tighten the locking nut 6, to reinforce the connection between the hollow hydraulic jack 5 and the cylinder head 9, and prevent any accidental separation or movement;

[0031] 6) Start the hand pump connected to the hollow hydraulic jack 5, drive the hollow hydraulic jack 5 to stretch upward by means of continuous pressurization, and use the generated huge vertical force to jointly act with the tool assembly to smoothly and powerfully pull out the valve seat 8, to complete the dismounting work.

[0032] The utility model is not limited to the embodiment, and any equivalent concept or change within the technical range disclosed by the utility model is included in the protection range of the utility model.​

Claims

1. A dismounting device for a valve seat of a cylinder head of a marine diesel engine, characterized in that The utility rod (1), the guide sleeve (2), the expansion sleeve (3), the compression nut (4), the hollow hydraulic jack (5), the locking nut (6) and the compression sleeve (7) are arranged in sequence. One end of the utility rod (1) is an action end for acting on the valve seat (8), and the other end is a fastening end for acting on the hollow hydraulic jack (5), wherein the action end and the fastening end are threaded rods, the action end is two threaded sections, and a positioning boss is arranged between the two threaded sections. The expansion sleeve (3) is arranged on the outer wall of the guide sleeve (2), and the contact surfaces of the two are mutually matched inclined surfaces. A limiting boss (200) is arranged on the outer edge of the end surface of the guide sleeve (2) for limiting the maximum displacement of the expansion sleeve (3). The guide sleeve (2) and the compression nut (4) are respectively arranged on the bidirectional threaded rod of the action end by screwing, so that when the compression nut (4) is rotated, the compression nut (4) acts on the expansion sleeve (3) in the direction of displacement generated by rotation, and the expansion sleeve (3) moves along the outer wall of the guide sleeve (2) and expands outward along the movement track. The lower end surface of the compression sleeve (7) is a valve seat port for abutting the valve seat port of the cylinder head, and the through hole of the action rod (1) is arranged in the center of the upper sleeve wall. The compression sleeve (7) and the hollow hydraulic jack (5) are sleeved on the action rod (1), the hollow hydraulic jack (5) is arranged on the upper sleeve wall of the compression sleeve (7) and is coaxial with the compression sleeve (7), and the fastening end of the action rod (1) is fixed with the hollow hydraulic jack by cooperation of the locking nut (6).

2. The disassembly device according to claim 1, characterized in that The threaded rod of the action end of the utility rod (1) is a bidirectional threaded rod, and the two threaded sections are positive and negative threads.

3. The disassembly device according to claim 2, characterized in that The expansion sleeve (3) is composed of four expansion blocks (300), the outer wall of the expansion block (300) is an inclined surface matched with the inner wall of the valve seat (8), the outer edge of the end surface of the expansion block (300) is processed into a clamping boss, the clamping boss and the inclined surface of the outer wall of the expansion block (300) form a clamping groove (301), and the clamping groove (301) is used for clamping the stress end surface of the valve seat (8).

4. The disassembly device according to claim 3, characterized in that The distance between the valve seat port of the compression sleeve (7) and the upper sleeve wall is greater than the axial height of the valve seat (8).

5. The disassembly device according to claim 4, characterized in that An observation hole (700) is arranged on the side wall of the compression sleeve (7).

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