Dismantling device and dismantling process for diesel engine cylinder cover air valve base

Abstract

The invention relates to the technical field of diesel engine maintenance, in particular to a dismantling device and technology for a diesel engine cylinder cover air valve base. The cylinder cover is provided with a seat hole, the air valve base is arranged in the seat hole, the air valve base is in interference fit with the hole wall of the seat hole, a plurality of boring holes are formed in the side wall of the air valve base at intervals in the circumferential direction of the air valve base, and the boring holes are all communicated with the seat hole. One end of the pull rod can sequentially penetrate through the support and the air valve base to be connected with the pull block, the pull block can abut against the bottom wall of the air valve base, and the other end of the pull rod is connected to the drawing device. Compared with the prior art, the multiple bored holes are formed in the periphery of the air valve base, in the dismantling process, mechanical stress between the bored holes and the wall of the base hole can be reduced, damage to the base hole can be reduced, the perfectness ratio of the base hole can be increased, and cost can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine maintenance, and in particular to a dismantling device and a dismantling process for a diesel engine cylinder head valve base. Background Art

[0002] Diesel generator sets are important equipment in general power plants, nuclear power plants or other places that require emergency power. Nuclear power plants attach great importance to power redundancy and emergency needs, so they are generally equipped with a certain number of mobile or non-mobile power supplies, and these emergency or backup power supplies generally use diesel generator sets. Its main function is to be able to supply power to the selected load for at least the minimum number of hours when the power plant loses the main and backup AC power supply, so that the required safety load can be guaranteed to get a stable power supply before the unit resumes normal operation, thereby ensuring the safe and stable operation of the unit. In order to ensure the availability of the diesel engine, the diesel engine needs to be inspected or repaired regularly. One of the more important tasks is the inspection and maintenance of the cylinder head during the overhaul, and one of the most important contents of this work is the removal of the cylinder head valve base and the replacement of the seal.

[0003] The removal and reinstallation of the cylinder head valve seat is a routine and mature maintenance project and process step in the field of diesel engine maintenance. The existing diesel engine cylinder head valve seat removal process is mainly through hydraulic pulling tools, which is simple and crude, and it is very easy to cause the inner surface of the seat hole to be pulled, thus causing the entire cylinder head body to be scrapped, and the replacement of the cylinder head increases the production cost.

[0004] Therefore, there is an urgent need for a dismantling device and a dismantling process for a diesel engine cylinder head valve base to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a dismantling device and dismantling process for a diesel engine cylinder head valve seat, which can ensure the integrity of the seat hole after the valve seat is dismantled and save costs.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A device for removing a valve base of a diesel engine cylinder head, the cylinder head being provided with a seat hole, the valve base being arranged in the seat hole, and the valve base being interference fit with the hole wall of the seat hole, the side wall of the valve base being provided with a plurality of boring holes at intervals along the circumferential direction of the valve base, and the plurality of boring holes being communicated with the seat hole, the device comprising: a bracket, a pull rod and a pull block, the bracket being arranged on the cylinder head, one end of the pull rod being able to pass through the bracket and the valve base in sequence and be connected to the pull block, the pull block being able to abut against the bottom wall of the valve base, and the other end of the pull rod being connected to a pulling device.

[0008] As a preferred technical solution of the above-mentioned device for removing the valve base of a diesel engine cylinder head, the side wall of the valve base is provided with four boring holes.

[0009] As a preferred technical solution of the above-mentioned device for removing the valve seat of a diesel engine cylinder head, the length of the boring hole is smaller than the length of the valve seat.

[0010] As a preferred technical solution of the above-mentioned device for removing the valve base of a diesel engine cylinder head, the pull rod is a screw rod, and the screw rod is threadedly connected to the bracket.

[0011] As a preferred technical solution of the above-mentioned removal device for a diesel engine cylinder head valve base, the removal device includes a nut, the nut is arranged on the bracket, and the screw rod is threadedly connected to the nut.

[0012] As an optimal technical solution of the above-mentioned device for removing the valve base of a diesel engine cylinder head, the pulling block is a flange, one end of the screw is fixedly connected to the flange, and the end face of the flange can be abutted against the end face of the valve base.

[0013] A dismantling process, using the dismantling device in any one of the above preferred technical solutions, the dismantling process comprising:

[0014] S1, placing the entire cylinder head on a boring machine, and boring the valve base;

[0015] S2. The bracket is arranged on the cylinder head, and the pull block is pulled out by the pull rod to remove the valve base.

[0016] As a preferred technical solution for the above-mentioned dismantling process, in S1, the portion of the valve base that needs to be bored is centrally fixed and aligned at a corresponding position on the boring machine by a fixture.

[0017] As a preferred technical solution for the above-mentioned dismantling process, in S1, a mark is made on the corresponding position of the valve base.

[0018] As a preferred technical solution of the above dismantling process, before S1, the dismantling process further includes:

[0019] S0. Clean the air valve base and the removal device.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a dismantling device for the valve base of a diesel engine cylinder head. The cylinder head is provided with a seat hole, the valve base is provided in the seat hole, and the valve base is interference fit with the hole wall of the seat hole, the side wall of the valve base is provided with a plurality of boring holes at intervals along the circumferential direction of the valve base, and the plurality of boring holes are all connected with the seat hole, and the dismantling device comprises: a bracket, a pull rod and a pull block, the bracket is provided on the cylinder head, one end of the pull rod can pass through the bracket and the valve base in turn to connect with the pull block, the pull block can abut against the bottom wall of the valve base, and the other end of the pull rod is connected to the pulling device. Compared with the prior art, by providing a plurality of boring holes around the seat hole, during the dismantling process, the mechanical stress between the seat hole and the hole wall can be reduced, the damage to the seat hole can be reduced, the intact rate of the seat hole can be improved, and the cost can be saved.

[0022] The present invention also provides a dismantling process. The dismantling process includes: S1, placing the entire cylinder head on a boring machine and boring the valve seat; S2, setting a bracket on the cylinder head, and pulling the pull block by a pull rod to pull out the valve seat. Compared with the prior art, this process can reduce damage to the seat hole, ensure the integrity of the seat hole, reduce the replacement of the cylinder head, enable the cylinder head to be reused, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a cylinder head provided by an embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of a device for removing a diesel engine cylinder head valve base provided by an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Cylinder head; 11. Seat hole; 222. Valve base; 22. Boring hole; 3. Bracket; 4. Pull rod; 5. Pull block; 6. Nut. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] like Figure 1 and Figure 2As shown, the present invention provides a dismantling device for the valve base of a diesel engine cylinder head. The cylinder head 1 is provided with a seat hole 11, and the valve base 2 is arranged in the seat hole 11, and the valve base 2 is interference fit with the hole wall of the seat hole 11, and the side wall of the valve base 2 is provided with a plurality of boring holes 22 at intervals along the circumferential direction of the valve base 2, and the plurality of boring holes 22 are all connected with the seat hole 11, and the dismantling device comprises: a bracket 3, a pull rod 4 and a pull block 5, the bracket 3 is arranged on the cylinder head 1, one end of the pull rod 4 can pass through the bracket 3 and the valve base 2 in sequence and connect with the pull block 5, the pull block 5 can abut against the bottom wall of the valve base 2, and the other end of the pull rod 4 is connected to the pulling device. Compared with the prior art, by providing a plurality of boring holes 22 around the valve base 2, during the dismantling process, the mechanical stress between the hole wall of the seat hole 11 can be reduced, the damage to the seat hole 11 can be reduced, the intact rate of the seat hole 11 can be improved, and the cost can be saved.

[0033] Optionally, the side wall of the valve seat 2 is provided with four boring holes 22. Specifically, the four boring holes 22 are respectively located at four right-angle positions of the valve seat 2 that are symmetrical in the upper and lower directions. Boring at the four symmetrical positions can ensure that the mechanical stress of the entire circle of the valve seat 2 is evenly reduced, avoid the occurrence of uneven stress such as large or small stress, and prevent the seat hole 11 from being damaged. Furthermore, the length of the boring hole 22 is less than the length of the valve seat 2, the boring hole 22 is a blind hole, and the boring hole 22 is semicircular, which can avoid enlarging the seat hole 11, so that the size of the seat hole 11 does not change, so that the cylinder head 1 can be reused.

[0034] Optionally, the pull rod 4 is a screw rod, which is threadedly connected to the bracket 3. Specifically, the staff only needs to rotate the screw rod, the bracket 3 and the cylinder head 1 are abutted, and the screw rod can move relative to the bracket 3 along the direction of the thread, thereby driving the valve base 2 to move, and the valve base 2 can be pulled out from the seat hole 11.

[0035] Optionally, the removal device includes a nut 6, which is arranged on the bracket 3, and the screw is threadedly connected to the nut 6. Specifically, the nut 6 is fixed to the top of the bracket 3, and the staff only needs to rotate the screw, the bracket 3 and the cylinder head 1 are abutted, and the screw can move relative to the nut 6 along the direction of the thread, thereby driving the valve base 2 to move, and the valve base 2 can be pulled out from the seat hole 11.

[0036] Optionally, the pull block 5 is a flange, one end of the screw is fixedly connected to the flange, and the end face of the flange can be against the end face of the valve seat 2. Specifically, the removal device is installed in the seat hole 11, and the contact position of the removal device is adjusted so that the force-bearing side of the valve seat 2 is in contact with the end face of the flange and the force is evenly applied. Then check whether the external drawing side is installed with the hydraulic device. After the inspection is correct, the drawing torque needs to be performed in steps, that is, the torque is increased from small to large, and it cannot be done in one step, so as to reduce the probability of the seat hole 11 being damaged during the drawing process.

[0037] The present invention also provides a dismantling process. The dismantling process includes: S1, placing the entire cylinder head 1 on a boring machine, and boring the valve seat 2; S2, setting the bracket 3 on the cylinder head 1, and pulling the pull block 5 by the pull rod 4 to pull out the valve seat 2. Compared with the prior art, the process can reduce the damage to the seat hole 11, ensure the integrity of the seat hole 11, reduce the replacement of the cylinder head 1, enable the cylinder head 1 to be reused, and reduce the production cost.

[0038] Optionally, in S1 , the portion of the valve base 2 that needs to be bored is centrally fixed and aligned at a corresponding position on a boring machine by a fixture; in S1 , a mark is made at a corresponding position of the valve base 2 . Specifically, before the valve base 2 is removed from the cylinder head 1, the entire cylinder head 1 is first placed on a boring machine, and then the part of the valve base 2 that needs to be bored and machined is centrally fixed and aligned on the corresponding position of the boring machine through a clamp; before formal machining, the machining depth and thickness of the processing position of the valve base 2 are calculated, and then marks are made at the corresponding positions of the valve base 2 (four right-angle positions symmetrical up and down and left and right). The machining depth and thickness of the workpiece are measured and calculated based on the actual size of the valve base 2, and they can be close (a certain margin must be left), but not completely consistent. During boring processing, the machining thickness of the workpiece (the depth has less influence than the thickness, and is mainly affected by the thickness) cannot exceed the original thickness of the valve base 2, and should be slightly smaller; in addition, machining is performed at four symmetrical positions up and down and left and right, so that the mechanical stress of the entire circle of the valve base 2 can be evenly reduced, so that the operation is easier during the second stage drawing process and the seat hole 11 is not easily damaged.

[0039] Furthermore, the valve base 2 is machined on a boring machine according to the calculated machining dimensions. After machining, check whether the depth and thickness of the boring hole 22 are appropriate. If not, further adjustments can be made to ensure that the machined thickness is close to the actual dimensions.

[0040] Optionally, before S1, the dismantling process further includes: S0, cleaning the valve seat 2 and the dismantling device. Specifically, before the pulling operation, the valve seat 2 and the dismantling device are cleaned to prevent foreign matter from entering the gap between the valve seat 2 and the seat hole 11 during the pulling process of the valve seat 2, causing impurities on the inner surface of the seat hole 11 to be scratched.

[0041] Optionally, the removal process includes: S3, after removing the valve base 2, checking whether there are any scratches or damage marks on the inner surface of the seat hole 11, evaluating the state of the seat hole 11 of the cylinder head 1 with the valve base 2 removed, and determining whether the cylinder head 1 can continue to be used.

[0042] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A device for removing a valve seat of a diesel engine cylinder head, wherein the cylinder head (1) is provided with a seat hole (11), the valve seat (2) is arranged in the seat hole (11), and the valve seat (2) and the hole wall of the seat hole (11) are interference fit, characterized in that: The side wall of the valve base (2) is provided with a plurality of boring holes (22) at intervals along the circumferential direction of the valve base (2), and the plurality of boring holes (22) are all connected to the seat hole (11). The dismantling device comprises: a bracket (3), a pull rod (4) and a pull block (5). The bracket (3) is provided on the cylinder head (1), and one end of the pull rod (4) can pass through the bracket (3) and the valve base (2) in sequence to be connected to the pull block (5). The pull block (5) can abut against the bottom wall of the valve base (2), and the other end of the pull rod (4) is connected to the pulling device.

2. A dismantling device for a diesel engine cylinder head valve base according to claim 1, characterized in that: The side wall of the air valve base (2) is provided with four boring holes (22).

3. A dismantling device for a diesel engine cylinder head valve base according to claim 1, characterized in that: The length of the boring hole (22) is smaller than the length of the air valve base (2).

4. A dismantling device for a diesel engine cylinder head valve base according to claim 1, characterized in that: The pull rod (4) is a screw rod, and the screw rod is threadedly connected to the bracket (3).

5. A dismantling device for a diesel engine cylinder head valve base according to claim 4, characterized in that: The dismantling device comprises a nut (6), the nut (6) is arranged on the bracket (3), and the screw rod is threadedly connected to the nut (6).

6. A dismantling device for a diesel engine cylinder head valve base according to claim 5, characterized in that: The pulling block (5) is a flange, one end of the screw is fixedly connected to the flange, and the end surface of the flange can abut against the end surface of the air valve base (2).

7. A dismantling process, characterized in that: Using the dismantling device according to any one of claims 1 to 6, the dismantling process comprises: S1, placing the entire cylinder head (1) on a boring machine, and boring the valve base (2); S2. The bracket (3) is arranged on the cylinder head (1), and the pull block (5) is pulled out by the pull rod (4) to remove the valve base (2).

8. The dismantling process according to claim 7, characterized in that: In S1, the portion of the valve base (2) that needs to be bored is centrally fixed and aligned at a corresponding position on the boring machine by means of a fixture.

9. The dismantling process according to claim 8, characterized in that: In S1, a mark is made on the corresponding position of the gas valve base (2).

10. The dismantling process according to claim 7, characterized in that: Before S1, the dismantling process further includes: S0. Cleaning the air valve base (2) and the removal device.

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