A diesel engine crankshaft precision grinding device and a method of using the same

Abstract

The application discloses a diesel engine crankshaft precision grinding device and a use method thereof, which comprises a base and a top base connected with the base through a support and located above the base, a rotating device is arranged on the top of the base, a lower chuck is arranged on the output end of the rotating device, an upper chuck is rotatably arranged on the bottom of the top base, a crankshaft body to be ground is arranged between the lower chuck and the upper chuck, an arc-shaped piece is arranged on the outer side of the connecting rod journal and the main shaft journal of the crankshaft body to be ground, the center of the arc-shaped piece is located on the same axis as the main shaft journal, and an arc-shaped grinding piece is arranged on the inner side of the arc-shaped piece. The arc-shaped grinding piece in the arc-shaped piece corresponding to the main shaft journal is in frictional contact with the main shaft journal in revolution when the crankshaft body to be ground rotates, and the arc-shaped grinding piece in the arc-shaped piece corresponding to the connecting rod journal is located on the path of the connecting rod journal in revolution, so that the position of the grinding structure does not need to be continuously adjusted manually, the grinding operation is convenient, and the danger of the grinding work is reduced.

Description

Technical Field

[0001] This invention relates to the field of diesel engine crankshaft machining technology, specifically to a precision grinding device for diesel engine crankshafts and its usage method. Background Technology

[0002] The crankshaft is one of the core components of a diesel engine. It typically consists of several parts, including connecting rod journals, main journals, cranks, and balance weights. To improve the accuracy and surface quality of the crankshaft and ensure the overall performance of the diesel engine, the crankshaft needs to be precisely machined using a precision grinding device after production.

[0003] Currently, the grinding of the main journals and connecting rod journals of diesel engine crankshafts is crucial. However, because the connecting rod journals and main journals are not on the same axis, grinding is quite troublesome. Therefore, most precision crankshaft grinding equipment requires operators to constantly adjust the position of the grinding structure when grinding the outer walls of the connecting rod journals and main journals. This is cumbersome and the frequent adjustments also increase the risk of accidents. To address this, we propose a precision grinding device for diesel engine crankshafts and its operating method. Summary of the Invention

[0004] The purpose of this invention is to provide a precision grinding device for diesel engine crankshafts and its method of use, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A precision grinding device for diesel engine crankshafts includes a base and a top seat connected to the base via a bracket and located above it. A rotating device is provided at the top of the base, and a lower chuck is provided at the output end of the rotating device. An upper chuck is rotatably provided at the bottom of the top seat. A crankshaft body to be ground is located between the lower and upper chucks. Arc-shaped components are fitted onto the outer sides of both the connecting rod journal and the main journal of the crankshaft body to be ground. The center of the arc-shaped component is located on the same axis as the main journal. An arc-shaped grinding component is provided on the inner side of the arc-shaped component. The inner wall of the arc-shaped grinding component corresponding to the main journal fits against the outer wall of the main journal. The inner wall of the arc-shaped grinding component corresponding to the connecting rod journal is located on the circular path along which the connecting rod journal rotates with the main journal. An adjusting block is connected to the outer side of the arc-shaped component via a connecting rod. The adjusting block is located on the outer wall of a vertical mounting base, which is movably positioned between the top seat and the base.

[0007] A further improvement is that the outer and inner diameters of the arc-shaped component corresponding to the connecting rod journal are both larger than the outer and inner diameters of the arc-shaped component corresponding to the main journal, and the axes of the arc-shaped component corresponding to the connecting rod journal and the arc-shaped component corresponding to the main journal are on the same axis.

[0008] A further improvement is that the arc-shaped grinding part is slidably connected to the arc-shaped part, and the mounting base is provided with a transmission mechanism connected to the rotating device, which is used to drive the arc-shaped grinding part to perform reciprocating arc-shaped motion relative to the arc-shaped part when the rotating device is working.

[0009] A further improvement is that the transmission mechanism includes a transmission telescopic rod horizontally rotatably inserted into the bottom of one side of the assembly base. One end of the transmission telescopic rod is rotatably connected to the inner wall of the assembly base, and the other end is connected to the rotating device via a gear transmission component. An auxiliary rod is horizontally rotatably provided at the top of the inner cavity of the assembly base. The auxiliary rod and the outer wall of the end of the transmission telescopic rod located inside the assembly base are connected via a toothed belt. A transmission rod is horizontally rotatably inserted into the adjusting block. A follower gear that meshes with the toothed belt is sleeved on the outer wall of the transmission rod. The other end of the transmission rod extends into a cavity opened inside the arc-shaped part. The end of the transmission rod located in the cavity is connected via a gear transmission component to a rod body 1 vertically rotatably inserted into the top of the arc-shaped part. A toothed gear is sleeved on the outer wall of the rod body 1. A connecting gear meshes on one side of the toothed gear. The connecting gear is rotatably located on the top of the arc-shaped part via a rod body 2 and a torsion spring. A driven gear is sleeved on the outer wall of the rod body 2. The driven gear meshes with an arc-shaped rack. The arc-shaped rack is located on the outer wall of the arc-shaped grinding part.

[0010] A further improvement is that a water-guiding component housing is fixedly connected to the side of the adjusting block away from the mounting base. The water-guiding component housing is movably sleeved on the outer wall of the transmission rod. A water-guiding impeller is fixedly sleeved on the outer wall of the transmission rod and located in the inner cavity of the water-guiding component housing. The input end of the water-guiding component housing is connected to the outlet end of the water pipe connector through a connecting hose. The inlet end of the water pipe connector is connected to a main pipe for connecting to the cooling water source. The output end of the water-guiding component housing is connected to a toughening spray pipe corresponding to the arc-shaped grinding part.

[0011] A further improvement is that transparent covers are symmetrically slidably provided on both sides between the base and the top seat. The upper and lower ends of the transparent covers and the side facing the crankshaft body to be ground are hollow. The transparent covers are connected to the outer wall of the rotating device through a telescopic device. The base is provided with a drain pipe that runs through the top of the base.

[0012] A further improvement is that the adjusting block is slidably disposed on the side of the assembly seat facing the crankshaft body to be ground, the outer wall of the adjusting block is provided with a connecting bracket, a threaded sleeve is rotatably inserted on the connecting bracket, the threaded sleeve is threaded onto the outer wall of the screw component, and the screw component is disposed on the side of the assembly seat adjacent to the adjusting block.

[0013] A further improvement is that the upper and lower ends of the mounting base are equipped with electric sliders, and the base and the top seat are both horizontally equipped with slide rails for the electric sliders to slide on opposite sides.

[0014] A further improvement is that the rotating device includes a protective seat on the base and a motor inside the protective seat, and the lower chuck and the output end of the motor are connected by an adjustable telescopic rod.

[0015] A precision grinding apparatus for diesel engine crankshafts as described above includes the following steps:

[0016] S1: Fix the crankshaft body to be ground between the lower chuck and the upper chuck. By moving the assembly seat, make the arc-shaped grinding part in the arc-shaped part corresponding to the connecting rod journal and the main journal fit against the outer wall of the connecting rod journal and the main journal.

[0017] S2: By opening the rotating device, the rotating device drives the crankshaft body to be ground to rotate. When the crankshaft body to be ground rotates, the main journal contacts and rubs against the arc-shaped grinding part in the corresponding arc-shaped part to perform grinding work. When the connecting rod journal revolves relative to the main journal, it contacts and rubs against the arc-shaped grinding part in the corresponding arc-shaped part and rotates on its own axis to perform grinding work.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention uses an arc-shaped component to contact the main journal and connecting rod journal of the crankshaft body to be ground. The arc-shaped grinding component in the arc-shaped component corresponding to the main journal makes frictional contact with the revolving main journal when the crankshaft body rotates, thus performing the grinding operation on the main journal. Meanwhile, the arc-shaped grinding component in the arc-shaped component corresponding to the connecting rod journal is located on the path of the revolving connecting rod journal. When the connecting rod journal revolves, it contacts and rubs against the inner wall of the corresponding arc-shaped grinding component and rotates, thus performing the grinding operation on the connecting rod journal. This eliminates the need for constant manual adjustment of the grinding structure position, making the grinding operation convenient and reducing the danger of grinding work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly base structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the arc-shaped component structure of the present invention;

[0023] Figure 4 For the present invention Figure 3 A schematic diagram of the structure from another perspective.

[0024] In the diagram: 1. Base; 2. Top seat; 3. Protective seat; 4. Motor; 5. Adjustable telescopic rod; 6. Lower chuck; 7. Upper chuck; 8. Crankshaft body to be ground; 9. Slide rail; 10. Assembly seat; 11. Adjusting block; 12. Connecting rod; 13. Arc-shaped component; 14. Screw component; 15. Arc-shaped grinding component; 16. Arc-shaped rack; 17. Driven gear; 18. Gear with missing teeth; 19. Transmission telescopic rod; 20. Toothed belt; 21. Follower gear; 22. Water intake component housing; 23. Water intake impeller; 24. Tough spray pipe; 25. Transmission rod; 26. Connecting hose; 27. Main pipe; 28. Transparent cover; 29. ​​Telescopic device; 30. Drainage pipe; 31. Connecting bracket; 32. Threaded sleeve. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] Please see the appendix Figure 1 - Appendix Figure 3

[0028] A precision grinding device for diesel engine crankshaft includes a base 1 and a top seat 2 connected to the base 1 via a bracket and located above it. The top of the base 1 is provided with a rotating device, and the output end of the rotating device is provided with a lower chuck 6. The bottom of the top seat 2 is rotatably provided with an upper chuck 7. The lower chuck 6 and the upper chuck 7 can be, for example, three-jaw chucks widely used in the art. The crankshaft body 8 to be ground is provided between the lower chuck 6 and the upper chuck 7. The crankshaft body 8 to be ground is a conventional diesel engine crankshaft. The diesel engine crankshaft usually consists of several parts such as connecting rod journal, main journal, crank, and balance weight. This grinding device is mainly used to grind the outer wall of the connecting rod journal and the main journal of the diesel engine crankshaft.

[0029] An arc-shaped component 13 is fitted on the outer side of both the connecting rod journal and the main journal of the crankshaft body 8 to be ground. An arc-shaped grinding component 15 is provided on the inner side of the arc-shaped component 13. The center of the arc-shaped component 13 is located on the same axis as the main journal. The inner wall of the arc-shaped grinding component 15 corresponding to the main journal fits against the outer wall of the main journal. The inner wall of the arc-shaped grinding component 15 corresponding to the connecting rod journal is located in the circle where the connecting rod journal rotates with the main journal. On the shaped path, it is used to grind the connecting rod journal and the outer wall of the main journal when the crankshaft body 8 to be ground rotates. When the crankshaft body 8 to be ground rotates, its main journal rotates around its center, while the connecting rod journal revolves around the axis of the main journal. The inner wall of the arc-shaped grinding part 15 in the arc-shaped part 13 of the main journal is in contact with the outer wall of the main journal, while the arc-shaped grinding part 15 in the arc-shaped part 13 of the connecting rod journal contacts its outer wall when the connecting rod journal revolves.

[0030] An adjusting block 11 is connected to the outer side of the arc-shaped part 13 via a connecting rod 12. The adjusting block 11 is located on the outer wall of a vertical mounting base 10. The mounting base 10 is movably located between the top seat 2 and the base 1 so that the crankshaft body 8 to be ground can be loaded and unloaded to the lower chuck 6 and the upper chuck 7.

[0031] Preferably, in this embodiment, the outer diameter and inner diameter of the arc-shaped part 13 corresponding to the connecting rod journal are both larger than the outer diameter and inner diameter of the arc-shaped part 13 corresponding to the main journal, and the axes of the arc-shaped part 13 corresponding to the connecting rod journal and the arc-shaped part 13 corresponding to the main journal are on the same axis.

[0032] Preferably, in this embodiment, the arc-shaped grinding part 15 is slidably connected to the arc-shaped part 13. For example, the outer wall of the arc-shaped grinding part 15 is provided with an arc-shaped slide bar, and the inner wall of the arc-shaped part 13 is provided with an arc-shaped slide groove that matches the arc-shaped slide bar. The mounting base 10 is provided with a transmission mechanism connected to the rotating device, which is used to drive the arc-shaped grinding part 15 to perform reciprocating arc-shaped motion relative to the arc-shaped part 13 when the rotating device is working. Through this arrangement, the grinding quality of the outer wall of the main journal and connecting rod journal by the arc-shaped grinding part 15 is improved.

[0033] Please see the appendix Figure 4

[0034] Preferably, the transmission mechanism of this embodiment includes a transmission telescopic rod 19 that is horizontally rotatably inserted into the bottom of one side of the mounting base 10. A bearing is provided at the connection between the transmission telescopic rod 19 and the mounting base 10. For example, the transmission telescopic rod 19 includes a mother rod and a daughter rod inserted into one end of the mother rod. The mother rod and the daughter rod are slidably connected by a flat key and a keyway.

[0035] One end of the transmission telescopic rod 19 is rotatably connected to the inner wall of the mounting base 10, and the other end is connected to the rotating device via a gear transmission component, such as a bevel gear set. An auxiliary rod is horizontally rotatably mounted on the top of the inner cavity of the mounting base 10. The auxiliary rod and the outer wall of the transmission telescopic rod 19 located within the mounting base 10 are connected via a toothed belt 20. Specifically, both the auxiliary rod and the outer wall of the transmission telescopic rod 19 can be equipped with sprockets that engage with the toothed belt 20, allowing the toothed belt 20 to perform transmission. A transmission rod 25 is horizontally rotatably inserted into the adjusting block 11. A bearing is provided at the connection between the transmission rod 25 and the adjusting block 11. A follower gear 21 that meshes with the toothed belt 20 is sleeved on the outer wall of the transmission rod 25. On one side of the toothed belt 20, when the toothed belt 20 rotates, it drives the follower gear 21 to rotate through the teeth on the outer wall. The other end of the transmission rod 25 extends into the cavity (not shown in the figure) opened in the arc-shaped part 13. The end of the transmission rod 25 located in the cavity is connected to a rod body 1 that is vertically rotatably inserted into the top of the arc-shaped part 13 through a gear transmission component (e.g., a bevel gear set). The outer wall of the rod body 1 is fitted with a toothed gear 18. A connecting gear meshes on one side of the toothed gear 18. The connecting gear is rotatably located on the top of the arc-shaped part 13 through the rod body 2 and the torsion spring. The outer wall of the rod body 2 is fitted with a driven gear 17. The driven gear 17 meshes with the arc-shaped rack 16. The arc-shaped rack 16 is located on the outer wall of the arc-shaped grinding part 15.

[0036] When the toothed belt 20 drives the follower gear 21, the follower gear 21 drives the transmission rod 25, the transmission rod 25 drives the rod body one through the gear transmission component, the rod body one drives the rod body two through the toothed gear 18 and the connecting gear, the rod body two drives the arc rack 16 through the driven gear 17, so that the arc grinding part 15 performs arc motion. When the tooth segment of the toothed gear 18 separates from the connecting gear, the rod body two drives the driven gear 17 to drive the arc rack 16 under the action of the torsion spring, so that the arc grinding part 15 returns to its original position. In this way, the arc grinding part 15 performs reciprocating arc motion.

[0037] Preferably, in this embodiment, the adjusting block 11 is fixedly connected to a water-guiding component housing 22 on the side away from the mounting base 10. The water-guiding component housing 22 is movably sleeved on the outer wall of the transmission rod 25. The water-guiding component housing 22 does not rotate with the transmission rod 25. A water-guiding impeller 23 is fixedly sleeved on the outer wall of the transmission rod 25 and located in the inner cavity of the water-guiding component housing 22. The input end of the water-guiding component housing 22 is connected to the outlet end of the water pipe connector through a connecting hose 26. The inlet end of the water pipe connector is connected to a main pipe 27 for connecting to the cooling water source. The output end of the water-guiding component housing 22 is connected to a tough spray pipe 24 corresponding to the arc-shaped grinding part 15.

[0038] The impeller 23 rotates inside the housing 22 of the water inlet, creating a negative pressure inside the housing 22. This causes the cooling water from the cooling water source to enter the toughness spray pipe 24 through the main pipe 27, the connector, the connecting hose 26, and the housing 22 of the water inlet. The toughness spray pipe 24 can be made of tough materials such as high-density polyethylene or stainless steel corrugated pipe, which makes it easy to adjust its outlet end to correspond with the arc-shaped grinding part 15. This allows for water spraying onto the grinding area for cooling, lubrication, and cleaning, thereby improving the grinding quality.

[0039] Preferably, in this embodiment, transparent covers 28 are symmetrically slidably provided on both sides between the base 1 and the top seat 2 to observe the grinding process of the crankshaft body 8 to be ground inside. The upper and lower ends of the transparent covers 28 and the side facing the crankshaft body 8 to be ground are hollow. The transparent covers 28 are connected to the outer wall of the rotating device through a telescopic device 29. The telescopic device 29 is, for example, an electric telescopic rod. The transparent covers 28 can be moved horizontally by the telescopic device 29, so that the two sets of transparent covers 28 come into contact and cover the crankshaft body 8 to be ground and its outer structure, effectively preventing the waste chips generated by grinding and the splashing of the sprayed liquid. The base 1 is provided with a drain pipe 30 that runs through the top of the base 1 to discharge the liquid and the waste chips generated by grinding.

[0040] Preferably, in this embodiment, the adjusting block 11 is slidably disposed on the side of the assembly seat 10 facing the crankshaft body 8 to be ground. The outer wall of the adjusting block 11 is provided with a connecting bracket 31. A threaded sleeve 32 is rotatably inserted on the connecting bracket 31. The threaded sleeve 32 is connected to the connecting bracket 31 through a bearing. The threaded sleeve 32 is threadedly sleeved on the outer wall of the screw member 14. The screw member 14 is disposed on the side of the assembly seat 10 adjacent to the adjusting block 11. The screw member 14 is rotatably disposed on the outer wall of the assembly seat 10.

[0041] The height of the arc-shaped grinding part 15 in this application can be less than the height of the corresponding crankshaft body 8 main journal or connecting rod journal to be ground. By rotating the screw part 14, the threaded sleeve 32 can drive the connecting bracket 31 to move the adjusting block 11, thereby adjusting the movement of the arc-shaped grinding part 15 on the corresponding main journal or connecting rod journal, and adjusting the grinding position of the arc-shaped grinding part 15 to adapt to main journals or connecting rod journals of different heights.

[0042] Preferably, the upper and lower ends of the mounting base 10 in this embodiment are provided with electric sliders, and the base 1 and the top seat 2 are provided with horizontal slide rails 9 on opposite sides for the electric sliders to slide, so as to drive the mounting base 10 to move horizontally.

[0043] Preferably, the rotating device in this embodiment includes a protective seat 3 on the base 1 and a motor 4 inside the protective seat 3. The lower chuck 6 and the output end of the motor 4 are connected by an adjustable telescopic rod 5. The adjustable telescopic rod 5 is prior art, so as to adjust the distance between the lower chuck 6 and the upper chuck 7, thereby adapting to crankshaft bodies 8 to be ground at different heights.

[0044] A precision grinding apparatus for diesel engine crankshafts as described above includes the following steps:

[0045] S1: Fix the crankshaft body 8 to be ground between the lower chuck 6 and the upper chuck 7. By moving the mounting base 10, make the arc-shaped grinding part 15 in the arc-shaped part 13 corresponding to the connecting rod journal and the main journal fit against the outer wall of the connecting rod journal and the main journal.

[0046] S2: By opening the rotating device, the rotating device drives the crankshaft body 8 to be ground to rotate. When the crankshaft body 8 to be ground rotates, the main journal contacts and rubs with the arc-shaped grinding part 15 in the corresponding arc-shaped part 13 to perform grinding work. When the connecting rod journal revolves relative to the main journal, it contacts and rubs with the arc-shaped grinding part 15 in the corresponding arc-shaped part 13 and rotates on its own axis to perform grinding work.

[0047] 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 precision grinding device for a diesel engine crankshaft, comprising a base (1) and a top seat (2) connected to the base (1) via a bracket and located above it, wherein a rotating device is provided on the top of the base (1), a lower chuck (6) is provided at the output end of the rotating device, an upper chuck (7) is rotatably provided at the bottom of the top seat (2), and a crankshaft body (8) to be ground is provided between the lower chuck (6) and the upper chuck (7), characterized in that: The connecting rod journal and the main journal of the crankshaft body (8) to be ground are both fitted with arc-shaped parts (13) on the outside. The center of the arc-shaped part (13) is located on the same axis as the main journal. The inner side of the arc-shaped part (13) is provided with an arc-shaped grinding part (15). The inner wall of the arc-shaped grinding part (15) corresponding to the main journal is in contact with the outer wall of the main journal. The inner wall of the arc-shaped grinding part (15) corresponding to the connecting rod journal is on the circular path of the connecting rod journal following the rotation of the main journal. The outer side of the arc-shaped part (13) is connected to an adjusting block (11) through a connecting rod (12). The adjusting block (11) is located on the outer wall of a vertical mounting base (10). The mounting base (10) is movably located between the top seat (2) and the base (1). The outer diameter and inner diameter of the arc-shaped part (13) corresponding to the connecting rod journal are both larger than the outer diameter and inner diameter of the arc-shaped part (13) corresponding to the main journal. The axes of the arc-shaped part (13) corresponding to the connecting rod journal and the arc-shaped part (13) corresponding to the main journal are on the same axis. The arc-shaped grinding part (15) is slidably connected to the arc-shaped part (13). The mounting base (10) is provided with a transmission mechanism connected to the rotating device, which is used to drive the arc-shaped grinding part (15) to reciprocate arc-shaped motion relative to the arc-shaped part (13) when the rotating device is working. The transmission mechanism includes a transmission telescopic rod (19) that is horizontally rotatably inserted into the bottom of one side of the mounting base (10). One end of the transmission telescopic rod (19) is rotatably connected to the inner wall of the mounting base (10), and the other end is connected to the rotating device through a gear transmission component. An auxiliary rod is horizontally rotatably provided at the top of the inner cavity of the mounting base (10). The auxiliary rod and the outer wall of the end of the transmission telescopic rod (19) located inside the mounting base (10) are connected by a toothed belt (20). A transmission rod (25) is horizontally rotatably inserted into the adjusting block (11). A follower gear (21) that meshes with the toothed belt (20) is sleeved on the outer wall of the transmission rod (25). The other end of the moving rod (25) extends into the cavity opened in the arc-shaped part (13). The end of the transmission rod (25) located in the cavity is connected to a rod body 1 that is vertically rotatably inserted into the top of the arc-shaped part (13) through a gear transmission component. A toothed gear (18) is sleeved on the outer wall of the rod body 1. A connecting gear is meshed on one side of the toothed gear (18). The connecting gear is rotatably located on the top of the arc-shaped part (13) through a rod body 2 and a torsion spring. A driven gear (17) is sleeved on the outer wall of the rod body 2. The driven gear (17) meshes with an arc-shaped rack (16). The arc-shaped rack (16) is located on the outer wall of the arc-shaped grinding part (15).

2. The device for precision grinding of a diesel engine crankshaft according to claim 1, characterized in that: The adjusting block (11) is fixedly connected to a water-guiding component housing (22) on the side away from the mounting base (10). The water-guiding component housing (22) is movably sleeved on the outer wall of the transmission rod (25). A water-guiding impeller (23) is fixedly sleeved on the outer wall of the transmission rod (25) and located in the inner cavity of the water-guiding component housing (22). The input end of the water-guiding component housing (22) is connected to the outlet end of the water pipe connector through a connecting hose (26). The inlet end of the water pipe connector is connected to a main pipe (27) for connecting to the cooling water source. The output end of the water-guiding component housing (22) is connected to a toughening spray pipe (24) corresponding to the arc-shaped grinding part (15).

3. A device for precision grinding of a diesel engine crankshaft according to claim 2, characterized in that: A transparent cover (28) is symmetrically slidably provided on both sides between the base (1) and the top seat (2). The upper and lower ends of the transparent cover (28) and the side facing the crankshaft body (8) to be ground are hollow. The transparent cover (28) is connected to the outer wall of the rotating device through the telescopic device (29). A drain pipe (30) is provided on the base (1) through the top of the base (1).

4. The device for precision grinding of a diesel engine crankshaft according to claim 1, characterized in that: The adjusting block (11) is slidably disposed on the side of the mounting base (10) facing the crankshaft body (8) to be ground. The outer wall of the adjusting block (11) is provided with a connecting bracket (31). A threaded sleeve (32) is rotatably inserted on the connecting bracket (31). The threaded sleeve (32) is threaded onto the outer wall of the screw member (14). The screw member (14) is disposed on the side of the mounting base (10) adjacent to the adjusting block (11).

5. The device for precision grinding of a diesel engine crankshaft according to claim 1, characterized in that: The upper and lower ends of the mounting base (10) are provided with electric sliders, and the base (1) and the top base (2) are provided with horizontal slide rails (9) for the electric sliders to slide on opposite sides.

6. The device for precision grinding of a diesel engine crankshaft according to claim 1, characterized in that: The rotating device includes a protective seat (3) on the base (1) and a motor (4) inside the protective seat (3). The lower chuck (6) and the output end of the motor (4) are connected by an adjustable telescopic rod (5).

7. A device for precision grinding of a diesel engine crankshaft as claimed in any one of claims 1 to 6, characterized in that: Includes the following steps: S1: Fix the crankshaft body (8) to be ground between the lower chuck (6) and the upper chuck (7), and by moving the mounting base (10), make the arc-shaped grinding part (15) in the arc-shaped part (13) corresponding to the connecting rod journal and the main journal fit against the outer wall of the connecting rod journal and the main journal. S2: By opening the rotating device, the rotating device drives the crankshaft body (8) to be ground to rotate. When the crankshaft body (8) to be ground rotates, the main journal contacts and rubs with the arc-shaped grinding part (15) in the corresponding arc-shaped part (13) to perform grinding work. When the connecting rod journal revolves relative to the main journal, it contacts and rubs with the arc-shaped grinding part (15) in the corresponding arc-shaped part (13) and rotates to perform grinding work.

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