A tool and method for repairing diesel engine valve seats

Abstract

This invention discloses a tool and method for dressing a diesel engine valve seat. The tool includes a guide support rod inserted into a valve guide tube; a first conical hole at the top of the guide support rod; a first center at the lower end of a connecting rod; the first center is inserted into the first conical hole; a lower guide block is fixedly connected to the upper end of the connecting rod, and an upper guide block is slidably connected to the upper end of the lower guide block; the lower and upper guide blocks are connected by a lead screw mechanism; a straight scale is provided at the joint between the lower and upper guide blocks; an angle adjustment plate is connected to the side wall of the upper guide block by connecting bolts; an angle scale is provided on the angle adjustment plate; an inclined electric grinder is connected to the lower part of the angle adjustment plate, and the grinding head at the lower end of the electric grinder faces the edge of the valve seat. This invention uses a color-coated inspection of the valve and valve seat to determine the amount of grinding required before using the tool of this invention for grinding, reducing the grinding time between the valve seat and valve during cylinder head repair, improving grinding efficiency, and ensuring effective sealing between the valve seat and valve. Furthermore, this tool is suitable for grinding different amounts of material, is portable, and easy to use.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically relating to a diesel engine valve seat repair tool and method. Background Technology

[0002] Marine diesel engines are characterized by their large size and the correspondingly heavy components. Generally, a diesel engine has an intake port on the cylinder head, with a valve seat fixed at the intake port outlet. The cylinder head also has a valve mounting channel communicating with the intake port, through which a guide sleeve is fixed. The valve stem is inserted into the guide sleeve, and the guide sleeve, valve mounting channel, and valve seat are collinear. The valves inside the cylinder head are components that operate frequently in high-temperature and harsh environments. The valve seat, the component that comes into contact with and seals the valve, is subjected to the high temperatures, erosion, and wear from carbon particles in the combustion chamber over a long period. This often leads to numerous or even large areas of pitting on the valve seat surface, and even misalignment. Therefore, during normal maintenance cycles, the cylinder head needs to be cleaned, inspected, and any out-of-tolerance components repaired. Good sealing between the valve and valve seat is essential. However, for engines with large cylinder heads and older engines, grinding the valve seat is time-consuming and labor-intensive due to the uncertainty of the required grinding amount. For example, the patent CN116673807B, entitled "A Correction Winch and Winch Method for Cylinder Head Valve Seats of Marine Four-Stroke Diesel Engines," describes a device suitable for circumferential grinding, but with a typically large grinding volume and low efficiency. It is unsuitable for valve seats with localized out-of-tolerance issues. Furthermore, it is often difficult to determine the required grinding amount of the valve seat before cylinder reassembly in a diesel engine, making this tool inflexible and unsuitable. Therefore, the prior art lacks an effective and portable valve seat grinding tool. Summary of the Invention

[0003] The technical problem this invention aims to solve is to overcome the shortcomings of existing methods and provide a diesel engine valve seat dressing tool and method. The purpose is to reduce the grinding time between the valve seat and valve during cylinder head repair by using a color-coating inspection of the valve and valve seat to determine the grinding amount before applying the valve seat grinding tool of this invention. This improves grinding efficiency and ensures effective sealing between the valve seat and valve. Furthermore, this tool is suitable for different grinding amounts, is portable, and easy to use.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine valve seat dressing tool, comprising a guide support rod inserted into a valve guide tube; a first conical hole at the top end of the guide support rod; a first tip at the lower end of a connecting rod; the first tip inserted into the first conical hole; a lower guide block fixedly connected to the upper end of the connecting rod, an upper guide block slidably connected to the upper end of the lower guide block, the lower guide block and the upper guide block being connected by a lead screw mechanism for driving the upper guide block to slide along the lower guide block; a linear scale is provided at the joint between the lower guide block and the upper guide block for reading the movement of the upper guide block; an angle adjustment plate is connected to the side wall of the upper guide block by connecting bolts for adjusting the angle of the angle adjustment plate; an angle scale is provided on the angle adjustment plate for reading the angle of the angle adjustment plate; an inclined electric grinder is connected to the lower part of the angle adjustment plate, the grinding head at the lower end of the electric grinder facing the edge of the valve seat.

[0005] As a further optimization, it also includes a valve guide positioning support lining the underside of the inverted cylinder head of the diesel engine. The upper end of the valve guide positioning support is provided with a second tip, which is inserted into a pre-set second conical hole at the lower end of the guide support rod.

[0006] As a further optimization, the lead screw mechanism includes a lead screw nut fitted on the lead screw, the lead screw nut being fixed to the lower end of the upper guide block, one end of the lead screw being connected to the center of a pre-set lead screw support on the lower guide block, and the other end being connected to the center of an end cover plate, the end cover plate being bolted to the end face of the lower guide block; the end of the lead screw extends out of the end cover plate and is provided with a handwheel for driving the lead screw to rotate.

[0007] As a further optimization, the upper end of the lower guide block is provided with a pair of parallel slide rails, and the lower end of the upper guide block is provided with a pair of slide tracks corresponding to the slide rails, for sliding connection between the upper guide block and the lower guide block.

[0008] As a further optimization, the upper end of the electric grinding machine is provided with a threaded head, which is screwed into a pre-set threaded hole in the angle adjustment plate. The end of the threaded head is connected to a fastening nut located on the upper surface of the angle adjustment plate, so that the height position of the grinding head can be adjusted.

[0009] As a further optimization, the middle part of the connecting rod is threaded to an auxiliary fixing plate; the other end of the auxiliary fixing plate is detachably connected to the electric angle grinder.

[0010] The present invention also provides a method for dressing a diesel engine valve seat, using the diesel engine valve seat dressing tool described above, comprising the following steps:

[0011] S1: Inspect the valve seat and valve to be ground and perform a coloring inspection. The coloring inspection method is to apply color to the valve, then insert it into the guide tube and press it tightly against the valve seat and rotate it. After that, remove the valve and check the coloring on the valve seat. If there are pits on the valve seat or the area of ​​the valve seat that can be colored is small, this dressing tool should be used; otherwise, proceed directly to step S8.

[0012] S2: Place the cylinder head upside down on the valve guide positioning support, install the guide support rod inside the valve guide, and then install this tool together with the connecting rod into the valve guide.

[0013] S3: Loosen the connecting bolts between the angle adjustment plate and the upper guide block, adjust the tilt angle of the electric grinder to match the valve seat so that the grinding angle of the grinding head is appropriate, and then tighten the connecting bolts to fix the angle adjustment plate.

[0014] S4: Loosen the fastening nut on the electric grinder, adjust the grinding head to the appropriate working height, and then tighten the fastening nut.

[0015] S5: Adjust the working radius of the electric grinder using the lead screw until the grinding head just contacts the valve seat. Record the readings of the linear scale on the upper and lower guide rail blocks. Then feed forward a small amount of about 0.01-0.02mm. This completes the pre-use adjustment of this tool.

[0016] S6: Turn on the electric grinding machine to start grinding. During the process, observe whether the grinding surface is uniform. If the grinding surface is not uniform, feed in a small amount of 0.01mm again until the grinding surface is visually uniform.

[0017] S7: Pull out this tool through the connecting rod, apply three colored stripes to the valve seat, then reinstall the tool. With the electric grinder stopped, rotate the tool one revolution and check if there is obvious stripe extension. If there is no stripe extension, it means that the valve seat dressing tool has achieved a uniform grinding effect. If the stripe extends, repeat steps S3-S6 until the stripe no longer extends, achieving the grinding effect. Remove all dressing tools.

[0018] S8: Use an air valve and apply abrasive to the surface of the air valve to grind the valve seat until it meets the requirements.

[0019] As a further optimization, in step S6, when the electric grinding machine is turned on for grinding, the lower guide block is rotated to drive the grinding head to rotate circumferentially along the edge of the valve seat, and to grind the valve seat circumferentially.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) This tool has a small and simple structure, which makes it easy to carry and use for repairs when traveling compared to large grinding machines; it is especially suitable for repairing marine diesel fuel.

[0022] (2) The grinding feed of this tool is adjustable, so it can adapt to both small and large grinding amounts. When the circumferential grinding amount is large, when the electric grinding machine is turned on for grinding, the lower guide block is rotated to drive the grinding head to rotate circumferentially along the edge of the valve seat to grind the valve seat circumferentially. This tool has good adaptability.

[0023] (3) The grinding feed of this tool can be precisely controlled. The grinding amount is precisely controlled by driving the upper guide block 12 with scale through the ball screw to move. It is convenient and flexible to operate.

[0024] (4) The grinding angle of this tool is adjustable. The grinding angle can be adjusted by rotating the angle adjustment plate, which can meet the grinding needs of valve seats with different tilt angles. Thus, one tool can be adapted to different models of engines, which is beneficial for engine repair work outside, reduces the types of tools to be carried, and further improves the portability.

[0025] (5) A top screw has been added to the end cover plate of the lower guide block to ensure that the guide block on the screw can be firmly positioned after the handwheel adjusts the ball screw, and to ensure that the working radius of the electric grinder on the angle adjustment plate is fixed when the tool is used.

[0026] (6) This method utilizes the connecting rod of this tool for quick assembly and disassembly, integrating inspection and grinding into one, which greatly improves inspection efficiency and grinding efficiency.

[0027] In summary, this invention involves color-coding the valve and valve seat to determine the amount of grinding required before using the tool of this invention for grinding. This reduces the grinding time between the valve seat and valve during cylinder head maintenance, improves grinding efficiency, and ensures effective sealing between the valve seat and valve. Furthermore, this tool is suitable for different grinding amounts, is portable, and easy to use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the installation structure according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the guide support rod according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the connecting rod according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the lower guide block mounting screw support according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the cover plate according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the angle adjustment plate according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the upper guide block mounting screw nut according to an embodiment of the present invention;

[0035] Figure 8 yes Figure 7 The left view;

[0036] Figure 9 A schematic diagram of the structure of the valve guide positioning support according to an embodiment of the present invention;

[0037] Figure 10 This is a flowchart illustrating the use of the grinding tool according to an embodiment of the present invention.

[0038] In the diagram: 1-Air valve guide positioning support, 2-Guide support rod, 21-First conical hole, 22-Second conical hole, 3-Connecting rod, 31 First center, 4-Lower guide block, 41 Slide rail, 5-Screw support, 6-End cover plate, 7-Handwheel, 8-Ball screw, 9-Screw support plate, 10-Angle adjustment plate, 101-Connecting bolt, 11-Angle pointer, 12-Upper guide block, 121-Slide rail, 13-Screw nut, 14-Electric grinder, 141-Grinding head, 142-Fasting nut, 15-Auxiliary fixing support plate, 17-Second center. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Please see Figure 1-10 This invention provides a technical solution: a diesel engine valve seat dressing tool and dressing method, such as... Figure 1 The diagram shows a working schematic of a valve seat trimming tool. This tool mainly consists of a valve guide positioning support 1, a guide support rod 2, a connecting rod 3, a lower guide rail block 4, a lead screw support 5, an end cover plate 6, a handwheel 7, a ball screw 8, a lead screw support plate 9, an angle adjustment plate 10, an angle pointer 11, an upper guide rail block 12, a lead screw nut 13, and an electric grinder 14.

[0041] The valve guide positioning support 1, guide support rod 2, and connecting rod 3 are all made of steel to ensure that they are not easily deformed during long-term use. The outer diameter of the rod body and the outer diameter of the deep annular groove of the valve guide positioning support 1 are controlled according to the inner and outer diameter dimensions of the valve guide, so that they are in a small clearance fit with the valve guide, which not only ensures positioning but also facilitates the installation of parts.

[0042] The upper guide block 12, the lower guide block 4, and the angle adjustment plate 10 are all made of aluminum alloy to reduce the overall weight of the tool.

[0043] The lower guide block 4 and the connecting rod 3 are connected by threads. The lower guide block 4 contains a lead screw support 5, and its front end is equipped with a lead screw support plate 9, which together support the ball screw 8. The lead screw support plate 9 and the end cover plate 6 are fixed to the lower guide block 4 with screws. A screw hole is drilled in the top of the cover plate, and a center screw is screwed in for lead screw positioning. The lead screw nut 13 is connected to the upper guide block 12 with bolts. Both the upper guide block 12 and the lower guide block 4 have matching guide grooves to allow the upper guide block 12 to slide smoothly under the action of the lead screw and the lead screw nut 13. During use, the lead screw is rotated by the handwheel 7 to move the upper guide block 12 horizontally, and the scale value is read for easy control of the horizontal feed rate.

[0044] The angle adjustment plate 10 is obtuse-angled and connected to the upper guide rail block 12 via hex bolts. The angle adjustment plate 10 has angle markings. After rotating the adjustment plate to the appropriate angle, tighten the two hex bolts. Below the adjustment plate is a fixed connecting plate with external threads at the rod head of the electric grinder 14. It has screw holes inside, allowing the electric grinder 14 to adjust its working height. The fastening nut 142 is used to tighten the plate to prevent loosening.

[0045] To ensure the stability of the grinding tool during operation, an auxiliary fixing plate 15 with a U-shaped groove was added to connect and fix the electric grinder 14 and the connecting rod 3.

[0046] As can be seen, the trimming tool of this embodiment includes at least a guide support rod 2 inserted into the air valve guide tube; the top end of the guide support rod 2 is provided with a first conical hole 21; the lower end of the connecting rod 3 is provided with a first tip 31; the first tip 31 is inserted into the first conical hole 21; the upper end of the connecting rod 3 is fixedly connected to the lower guide rail block 4, the upper guide rail block 12 is slidably connected to the upper end of the lower guide rail block 4, the lower guide rail block 4 and the upper guide rail block 12 are connected by a screw mechanism, which is used to drive the upper guide rail block 12 to slide along the lower guide rail block 4; in the lower A straight scale is provided at the joint between the guide rail block 4 and the upper guide rail block 12 for reading the movement of the upper guide rail block 12; the side wall of the upper guide rail block 12 is connected to the angle adjustment plate 10 by connecting bolts 101 for adjusting the angle of the angle adjustment plate 10; the angle adjustment plate 10 is provided with an angle scale for reading the angle of the angle adjustment plate 10; the lower part of the angle adjustment plate 10 is connected to an inclined electric grinding machine 14, and the grinding head 141 at the lower end of the electric grinding machine 14 faces the edge of the air valve seat.

[0047] The trimming tool also includes a valve guide positioning support 1 that is padded under the inverted cylinder head of the diesel engine. The valve guide positioning support 1 has a second tip 17 at its upper end, which is inserted into a second conical hole 22 at the lower end of the guide support rod 2.

[0048] The lead screw mechanism includes a lead screw nut 13 fitted on the lead screw, the lead screw nut 13 being fixed to the lower end of the upper guide block 12, one end of the lead screw being connected to the center of a lead screw support 5 pre-set on the lower guide block 4, and the other end being connected to the center of an end cover plate 6, the end cover plate 6 being bolted to the end face of the lower guide block 4; the end of the lead screw extends out of the end cover plate 6 and is provided with a handwheel 7 for driving the lead screw to rotate.

[0049] The lower guide block 4 has a pair of parallel slide rails 41 at its upper end, and the upper guide block 12 has a pair of slide rails 121 at its lower end that correspond to the slide rails 41, for sliding connection between the upper guide block 12 and the lower guide block 4.

[0050] The upper end of the electric grinding machine 14 is provided with a threaded head, which is screwed into the pre-set threaded hole of the angle adjustment plate 10. The end of the threaded head is connected to the fastening nut 142 located on the upper surface of the angle adjustment plate 10, so that the height position of the grinding head 141 can be adjusted.

[0051] The connecting rod 3 is threadedly connected to an auxiliary fixing plate in the middle; the other end of the auxiliary fixing plate is detachably connected to the electric angle grinder.

[0052] Before using the grinding tool, parts 3 to 15 can be assembled and stored properly in advance for easy carrying and use. The steps for using this grinding tool are as follows:

[0053] (1) Inspect the valve seat and valve to be ground and perform a coloring test (after coloring the valve, insert it into the guide tube and press it tightly with the valve seat and rotate it). If there are pits on the valve seat or the area of ​​the valve seat that can be colored is small, you should consider using this valve seat dressing tool to reduce the grinding time. Otherwise, directly grind the valve seat and valve until they meet the relevant requirements.

[0054] (2) Place the cylinder head upside down on the two valve guide positioning supports 1, install the guide support rod inside the valve guide, and then install the connecting rod 3 of the valve seat trimming tool (part 3-15) into the valve guide.

[0055] (3) Loosen the connecting bolts 101 of the angle adjustment plate 10 and the upper guide rail block 12, and the connecting bolts 101 of the auxiliary fixing plate U-shaped groove and the electric grinder 14. After adjusting the tilt angle of the electric grinder 14 to match the valve seat, tighten the connecting bolts 101 of the angle adjustment plate 10 and the upper guide rail block 12.

[0056] (4) Loosen the fastening nut 142 on the electric grinder 14, and tighten the nut after adjusting the electric grinder 14 to a suitable working height by turning it.

[0057] (5) Rotate handwheel 77 to adjust the working radius of electric grinder 14 via lead screw until the grinding head just contacts the valve seat. Record the readings of the upper guide block 12 and lower guide block 4. Then feed forward a small amount of about 0.01-0.02mm. Tighten the connecting bolt 101 between the auxiliary fixing plate U-groove and electric grinder 14. The connecting bolt 101 is also slidably connected to electric grinder 14. This completes the pre-use adjustment of the grinding tool.

[0058] (6) Turn on the electric grinding machine 14 to start grinding. During the process, observe whether the grinding surface is uniform. If the grinding surface is not uniform, feed a small amount of 0.01mm again until the grinding surface is visually uniformly ground.

[0059] (6) Remove the valve seat dressing tool assembly (part 3-15), apply three colored stripes to the valve seat, reinstall the grinding tool assembly (part 3-15), and rotate the grinding tool assembly (part 3-15) one revolution while the electric grinding machine 14 is stopped. Check if there is obvious color strip extension. If there is no color strip extension, it means that the valve seat dressing tool has achieved a uniform grinding effect.

[0060] (7) Remove all grinding tools and use valves and valve seats to grind until they meet the relevant requirements.

[0061] As can be seen, the trimming tool of this embodiment includes at least a guide support rod 2 inserted into the air valve guide tube; the top end of the guide support rod 2 is provided with a first conical hole 21; the lower end of the connecting rod 3 is provided with a first tip 31; the first tip 31 is inserted into the first conical hole 21; the upper end of the connecting rod 3 is fixedly connected to the lower guide rail block 4, the upper guide rail block 12 is slidably connected to the upper end of the lower guide rail block 4, the lower guide rail block 4 and the upper guide rail block 12 are connected by a screw mechanism, which is used to drive the upper guide rail block 12 to slide along the lower guide rail block 4; in the lower A straight scale is provided at the joint between the guide rail block 4 and the upper guide rail block 12 for reading the movement of the upper guide rail block 12; the side wall of the upper guide rail block 12 is connected to the angle adjustment plate 10 by connecting bolts 101 for adjusting the angle of the angle adjustment plate 10; the angle adjustment plate 10 is provided with an angle scale for reading the angle of the angle adjustment plate 10; the lower part of the angle adjustment plate 10 is connected to an inclined electric grinding machine 14, and the grinding head 141 at the lower end of the electric grinding machine 14 faces the edge of the air valve seat.

[0062] In summary, the advantages of this embodiment are as follows.

[0063] (1) This tool has a small and simple structure, which makes it easy to carry and use for repairs when traveling compared to large grinding machines; it is especially suitable for repairing marine diesel fuel.

[0064] (2) The grinding feed of this tool is adjustable, so it can adapt to both small and large grinding amounts. When the grinding amount is large, when the electric grinding machine 14 is turned on for grinding, the lower guide block 4 is rotated to drive the grinding head 141 to rotate circumferentially along the edge of the valve seat to grind the valve seat circumferentially. This tool has good adaptability.

[0065] (3) The grinding feed of this tool can be precisely controlled. The grinding amount is precisely controlled by driving the upper guide block 12 with scale through the ball screw 8 to move. It is convenient and flexible to operate.

[0066] (4) The grinding angle of this tool is adjustable. The grinding angle can be adjusted by rotating the angle adjustment plate 10. It can meet the grinding needs of valve seats with different tilt angles. Thus, one tool can be adapted to different models of engines, which is beneficial for engine repair work outside the home. It reduces the types of tools to carry and further improves portability.

[0067] (5) A top screw has been added to the end cover plate 6 of the lower guide block 4 to ensure that the guide block 12 on the screw can be firmly positioned after the handwheel 7 adjusts the ball screw 8, and to ensure that the working radius of the electric grinder 14 on the angle adjustment plate 10 is fixed when the tool is used.

[0068] (6) This method utilizes the connecting rod 3 of this tool for quick assembly and disassembly, integrating inspection and grinding into one, which greatly improves inspection efficiency and grinding efficiency.

[0069] In summary, this invention involves color-coding the valve and valve seat to determine the amount of grinding required before using the tool of this invention for grinding. This reduces the grinding time between the valve seat and valve during cylinder head maintenance, improves grinding efficiency, and ensures effective sealing between the valve seat and valve. Furthermore, this tool is suitable for different grinding amounts, is portable, and easy to use.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diesel engine valve seat dressing tool, comprising a guide support rod (2) inserted into the valve guide tube; characterized in that: The guide support rod (2) has a first conical hole (21) at its top end; the connecting rod (3) has a first tip (31) at its lower end; the first tip (31) is inserted into the first conical hole (21); the upper end of the connecting rod (3) is fixedly connected to the lower guide block (4), and the upper guide block (12) is slidably connected to the upper end of the lower guide block (4). The lower guide block (4) and the upper guide block (12) are connected by a screw mechanism to drive the upper guide block (12) to slide along the lower guide block (4); a straight scale is provided at the joint between the lower guide block (4) and the upper guide block (12); the side wall of the upper guide block (12) is connected to the angle adjustment plate (10) by a connecting bolt (101) so that the angle of the angle adjustment plate (10) can be adjusted; the angle adjustment plate (10) is provided with an angle scale. The lower part of the angle adjustment plate (10) is connected to an inclined electric grinding machine (14), and the grinding head (141) at the lower end of the electric grinding machine (14) faces the edge of the air valve seat. It also includes a valve guide positioning support (1) that is padded under the inverted cylinder head of the diesel engine. The valve guide positioning support (1) has a second tip (17) at its upper end, and the second tip (17) is inserted into the second cone hole (22) at the lower end of the guide support rod (2). The middle part of the connecting rod (3) is threaded to an auxiliary fixing plate; the other end of the auxiliary fixing plate is detachably connected to the electric grinding machine (14).

2. The diesel engine valve seat dressing tool according to claim 1, characterized in that: The lead screw mechanism includes a lead screw nut (13) fitted on the lead screw, the lead screw nut (13) being fixed to the lower end of the upper guide block (12), one end of the lead screw being connected to the center of a lead screw support (5) preset on the lower guide block (4), and the other end being connected to the center of an end cover plate (6), the end cover plate (6) being bolted to the end face of the lower guide block (4); the end of the lead screw extends out of the end cover plate (6) and is provided with a handwheel (7) for driving the lead screw to rotate.

3. The diesel engine valve seat dressing tool according to claim 1, characterized in that: The lower guide block (4) has a pair of parallel slide rails (41) at its upper end, and the upper guide block (12) has a pair of slide tracks (121) at its lower end that correspond to the slide rails (41), for sliding connection between the upper guide block (12) and the lower guide block (4).

4. A diesel engine valve seat dressing tool according to claim 1, characterized in that: The upper end of the electric grinding machine (14) is provided with a threaded head and screwed into the pre-set screw hole of the angle adjustment plate (10). The end of the threaded head is connected to the fastening nut (142) located on the upper surface of the angle adjustment plate (10) for adjusting the height position of the grinding head (141).

5. A method for adjusting the valve seat of a diesel engine, characterized in that, The diesel engine valve seat dressing tool as described in any one of claims 1-4 includes the following steps: S1: Inspect the valve seat and valve to be ground and perform a coloring inspection. The coloring inspection method is to apply color to the valve, then insert it into the guide tube and press it tightly against the valve seat, rotate it, and then remove the valve to check the coloring on the valve seat. If the valve seat has pits or the area of ​​the valve seat that can be colored is small, this dressing tool should be used; otherwise, proceed directly to step S8. S2: Place the cylinder head upside down on the valve guide positioning support (1), install the guide support rod inside the valve guide, and then install this tool together with the connecting rod (3) into the valve guide; S3: Loosen the connecting bolts (101) of the angle adjustment plate (10) and the upper guide block (12), adjust the tilt angle of the electric grinder (14) to match the valve seat so that the grinding angle of the grinding head (141) is appropriate, and then tighten the connecting bolts (101) to fix the angle adjustment plate (10). S4: Loosen the fastening nut (142) on the electric grinder (14), adjust the grinding head (141) to the appropriate working height, and then tighten the fastening nut (142). S5: Adjust the working radius of the electric grinding machine (14) by means of the lead screw until the grinding head (141) just touches the valve seat. Record the reading of the linear scale of the upper and lower guide rail blocks (4, 12) and feed forward another 0.01-0.02mm. This completes the adjustment work before using this tool. S6: Turn on the electric grinding machine (14) to start grinding. During the process, observe whether the grinding surface is uniform. If the grinding surface is not uniform, feed a small amount of 0.01mm again until the grinding surface is visually uniformly ground. S7: Pull out the tool through the connecting rod (3), apply three colored stripes to the valve seat, and then reinstall the tool. With the electric grinder (14) stopped, rotate the tool one revolution to check if there is obvious strip extension. If there is no strip extension, it means that the valve seat dressing tool has achieved a uniform grinding effect. If the strip extends, repeat steps S3-S6 until the strip does not extend and the grinding effect is achieved. Remove all dressing tools. S8: Use an air valve and apply abrasive to the surface of the air valve to grind the valve seat until it meets the requirements.

6. The method for adjusting the valve seat of a diesel engine according to claim 5, characterized in that: When the electric grinding machine (14) is turned on in step S6 for grinding, the lower guide block (4) is rotated to drive the grinding head (141) to rotate circumferentially along the edge of the valve seat to grind the valve seat circumferentially.

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