Crankshaft dead angle-free polishing device for diesel engine and polishing method

Abstract

The application discloses a crankshaft dead angle-free polishing device and polishing method for diesel engines, which comprises a workbench, clamping assemblies and driving members arranged on the workbench, polishing assemblies one, polishing assemblies two and polishing assemblies three. One end of each of the polishing assemblies one is connected with the workbench, and the other end is sleeved on one end of the connecting rod neck of the clamped crankshaft. One end of each of the polishing assemblies two is connected with the workbench, and the other end is abutted against the main shaft neck of the clamped crankshaft. One end of each of the polishing assemblies three is connected with the workbench, and the other end is abutted against the crankshaft of the clamped crankshaft. The polishing assemblies one polish the connecting rod neck surface wall and the crank arm on one side of the connecting rod neck end of the crankshaft when the clamped crankshaft rotates or moves. The polishing assemblies two polish the main shaft neck surface wall and the crank arm on the other side of the main shaft neck end of the crankshaft when the clamped crankshaft rotates or moves. The polishing assemblies three polish the crankshaft of the clamped crankshaft. The dead angle of polishing is effectively reduced, the device is convenient to use, and the work load is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diesel engine part processing technology, in particular to a crankshaft polishing device and polishing method for diesel engine. BACKGROUND

[0002] The diesel engine crankshaft is an important part of the diesel engine, which bears the force transmitted by the connecting rod and converts it into torque through the crankshaft to drive other accessories on the diesel engine.

[0003] The structure of the diesel engine crankshaft usually includes a connecting rod neck, crank arms arranged at both ends of the connecting rod neck, and a main shaft neck arranged between adjacent two crank arms. During the processing of the diesel engine crankshaft, the crankshaft needs to be polished to meet the needs of later use.

[0004] Publication No. CN108818284B proposes a crankshaft polishing device and polishing method for diesel engine. The polishing device specifically discloses: a base, a clamping device capable of fixing both ends of the crankshaft, a lifting device, and a polishing device. The clamping device includes a first clamping device and a second clamping device with adjustable spacing. The lifting device is fixed on the base and located between the first clamping device and the second clamping device. The polishing device is connected to the lifting device. The polishing device includes a housing, a plurality of main shaft neck polishing parts, and a plurality of connecting rod neck polishing parts. The main shaft neck polishing parts and the connecting rod neck polishing parts are arranged in an alternating manner, and their positions correspond to the positions of the main shaft neck and the connecting rod neck on the crankshaft.

[0005] The above-mentioned crankshaft polishing device can polish the main shaft neck and the connecting rod neck of the crankshaft to be polished at the same time, but it cannot polish the surface wall of the crank arm of the crankshaft, and there is a polishing dead angle. Therefore, independent polishing equipment is often used to polish the surface wall of the crank arm in the later stage, which is more troublesome and increases the workload. Therefore, we propose a crankshaft polishing device and polishing method for diesel engine without dead angle. SUMMARY

[0006] The purpose of the present application is to provide a crankshaft polishing device and polishing method for diesel engine without dead angle to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The crankshaft polishing device for diesel engine without dead angle comprises:

[0009] A workbench, the workbench is provided with a clamping assembly for clamping the crankshaft and a driving member for driving the crankshaft clamped by the clamping assembly to rotate or move horizontally;

[0010] The polishing assembly one is provided with a plurality of groups, one end of each of the polishing assembly one is connected with the workbench, the other end is respectively sleeved on one end of the connecting rod neck of the clamped crankshaft, and is used for polishing the surface wall of the connecting rod neck of the crankshaft and one side surface wall of the crank arm at the end of the connecting rod neck when the clamped crankshaft rotates or moves; and,

[0011] The polishing assembly two is provided with a plurality of groups, one end of each of the polishing assembly two is connected with the workbench, the other end is respectively abutted with the main shaft neck of the clamped crankshaft, and is used for polishing the surface wall of the main shaft neck of the crankshaft and the other side surface wall of the crank arm at the end of the main shaft neck when the clamped crankshaft rotates or moves.

[0012] Further improvement lies in that the polishing assembly one comprises:

[0013] The arc-shaped seat one is provided with the arc-shaped seat two on the arc-shaped seat one, the arc-shaped seat one and the arc-shaped seat two are fixed and movably sleeved on the outer wall of the connecting rod neck through the fixing piece, the arc-shaped polishing piece is rotatably arranged in the arc-shaped seat one and the arc-shaped seat two, the arc-shaped polishing pieces of the arc-shaped seat one and the arc-shaped seat two are detachably connected to form a polishing ring for polishing the outer wall of the connecting rod neck, and the arc-shaped polishing pieces are vertically provided with polishing pieces one on both ends of the axis for polishing the surface wall of the crank arm.

[0014] The mounting seat is fixedly arranged at the bottom of the arc-shaped seat one, one end of the connecting rod is rotatably connected in the mounting seat, the other end of the connecting rod is provided with a piston, the piston is movably arranged in the cylinder, the cylinder is arranged on the workbench, one side of the cylinder is provided with a one-way air inlet pipe, a flow passage is further formed in the cylinder, the flow passage and the inner cavity of the cylinder are communicated through an air inlet port, the flow passage is communicated with a gas-driven assembly through an exhaust pipe, and the gas-driven assembly is arranged in the mounting seat and used for driving the polishing ring to rotate.

[0015] Further improvement lies in that the polishing assembly two comprises:

[0016] The polishing wheel is arranged at one end of the telescopic rod and abuts against the main shaft neck, and is used for polishing the surface wall of the main shaft neck of the crankshaft, and the other end of the telescopic rod is connected with the workbench.

[0017] The polishing pieces two are provided with at least two groups, the two groups of polishing pieces two are vertically arranged on both sides of the polishing wheel, the two groups of polishing pieces two are respectively in contact with the other side surface wall of the crank arm at both ends of the main shaft neck, and are used for polishing the other side surface wall of the crank arm, the two groups of polishing pieces two are sleeved on the outer wall of the guide rod, the guide rod is horizontally arranged on the telescopic rod, the outer wall of the guide rod is sleeved with the elastic piece two, one end of the elastic piece two is connected with the polishing piece two, and the other end is connected with the telescopic rod.

[0018] Further improvement lies in that the gas-driven assembly comprises:

[0019] A guide shell is arranged in the mounting seat, and the guide shell is provided with an air outlet end and an air inlet end communicated with the air exhaust pipe;

[0020] A guide vane is arranged in the guide shell through a rotating shaft, and the gas supplied from the air inlet end drives the rotation of the guide vane, one end of the rotating shaft is movably penetrated through the guide shell and fixedly sleeved with a gear; and

[0021] A tooth ring, the tooth ring comprises two arc-shaped racks, and the two groups of arc-shaped racks are respectively arranged in the arc-shaped grooves formed in the outer walls of the arc-shaped seat one and the arc-shaped seat two;

[0022] One end of the gear is penetrated through the movable opening formed in the arc-shaped seat one and engaged with the tooth ring.

[0023] Further improvement lies in that a supporting protrusion is fixedly arranged in the flow cavity, and an elastic member one is arranged on the side of the supporting protrusion facing the air inlet opening and provided with a sealing plate, the diameter of the sealing plate is greater than the diameter of the air inlet opening and smaller than the inner diameter of the flow cavity.

[0024] Further improvement lies in that the driving member comprises:

[0025] A rotating device is slidably arranged on the workbench through the assembly seat, and the output end of the rotating device is connected with the clamping assembly; and

[0026] A telescopic device is connected with the workbench at one end and connected with the assembly seat at the other end.

[0027] A polishing method of the crankshaft dead angle-free polishing device for diesel engines, using the above-mentioned polishing device, comprising the following steps:

[0028] S1: the crankshaft to be polished is clamped through the clamping assembly, so that the arc-shaped seat one on the polishing assembly one corresponds to the connecting rod journal of the crankshaft, then the arc-shaped seat two is installed on the arc-shaped seat one through the fixing member, at this time, the telescopic rod is adjusted again so that the polishing wheel contacts the main journal of the crankshaft, and the polishing piece two contacts the outer wall of the crank arm at the end of the main journal;

[0029] S2: the rotating device is opened to drive the clamping assembly to rotate the clamped crankshaft, when the crankshaft rotates, the piston is driven to reciprocate in the cylinder through the mounting seat and the connecting rod, so that the external air enters the cylinder from the one-way air inlet pipe and is then compressed into the flow cavity, and then is discharged into the guide shell through the air exhaust pipe to drive the guide vane, the guide vane drives the rotating shaft to drive the gear to drive the tooth ring, and then the polishing ring rotates relative to the surface wall of the connecting rod journal to polish the surface wall of the connecting rod journal, at the same time, the rotation of the polishing ring also drives the polishing piece one to rub the surface wall of the crank arm at one end of the connecting rod journal, and the polishing wheel and the polishing piece two rub the main journal of the crankshaft and the outer wall of the crank arm on the other side at the end of the main journal when the crankshaft rotates;

[0030] S3: during polishing, the crankshaft is horizontally moved by the telescopic device so as to polish the surface wall of the other end of the connecting rod neck crank arm by the polishing sheet on the other side through friction.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] The present application effectively reduces the dead angle of polishing, eliminates the need for independent polishing equipment to polish the surface wall of the crank arm in the later stage, is convenient to use, and reduces the workload. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The present application has the following advantages:

[0034] Figure 2 The present application has the following advantages:

[0035] Figure 3 The present application has the following advantages:

[0036] Figure 4 The present application has the following advantages: Figure 3

[0037] Figure 5 The present application has the following advantages:

[0038] In the figure: 100, workbench; 200, clamping assembly; 300, driving piece; 301, rotating device; 302, telescopic device; 400, polishing assembly one; 401, arc-shaped seat one; 402, arc-shaped seat two; 403, fixing piece; 404, arc-shaped polishing piece; 405, mounting seat; 406, connecting rod; 407, piston; 408, cylinder; 409, one-way air inlet pipe; 410, flow-through cavity; 411, exhaust pipe; 412, guide shell; 413, guide vane; 414, rotating shaft; 415, gear; 416, gear ring; 417, polishing sheet one; 418, sealing plate; 419, elastic piece one; 500, polishing assembly two; 501, polishing wheel; 502, polishing sheet two; 503, guide rod; 504, telescopic rod; 505, elastic piece two. DETAILED DESCRIPTION

[0039] ​Clearly, the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0040] Embodiment 1

[0041] Please refer to the accompanying Figure 1

[0042] The device for polishing the crankshaft of diesel engine comprises:

[0043] The workbench 100 is provided with the clamping assembly 200 for clamping the crankshaft and the driving member 300 for driving the clamped crankshaft to rotate or horizontally move.

[0044] The clamping assembly 200 is prior art, for example, the clamping assembly 200 comprises the support slidingly arranged at one end of the workbench 100, the rotating shaft rotatingly arranged at one end of the support, and the chuck one arranged at one end of the rotating shaft, and further comprises the chuck two arranged at the output end of the driving member 300, and the chuck one and the chuck two can adopt the three-jaw chuck, of course, the clamping assembly 200 of the present application is not limited to the above structure.

[0045] The driving member 300 comprises:

[0046] The rotating device 301, for example, the motor and the speed reducer, is slidingly arranged on the workbench 100 through the assembly seat, and the output end of the rotating device 301 is connected with the clamping assembly 200; and

[0047] The telescopic device 302 is connected with the workbench 100 at one end and connected with the assembly seat at the other end.

[0048] The clamped crankshaft can be driven to rotate by the rotating device 301, and the telescopic device 302 is used for driving the clamped crankshaft to horizontally move, so as to change the polishing position of the crankshaft.

[0049] It should be noted that the crankshaft is prior art, comprising the main shaft neck, the crank arm and the connecting rod neck and the like.

[0050] The polishing assembly one 400 is provided with a plurality of groups, one end of the plurality of groups of the polishing assembly one 400 is connected with the workbench 100, and the other end is respectively sleeved on one end of the connecting rod neck of the clamped crankshaft, and is used for polishing the surface wall of the connecting rod neck and the side surface wall of the crank arm at the end of the connecting rod neck of the clamped crankshaft when the clamped crankshaft rotates or moves; and

[0051] The polishing assembly two 500 is provided with a plurality of groups, one end of each of the plurality of groups of the polishing assembly two 500 is connected with the workbench 100, the other end is respectively abutted with the main journal of the clamped crankshaft, and is used for polishing the surface wall of the main journal of the crankshaft and the surface wall of the other side of the crank web of the main journal end when the clamped crankshaft rotates or moves.

[0052] Please refer to the attached Figure 2 -attached Figure 4

[0053] As preferred, the polishing assembly one 400 of the embodiment comprises:

[0054] The arc-shaped seat one 401 is provided with the arc-shaped seat two 402 symmetrically, the arc-shaped seat one 401 and the arc-shaped seat two 402 are fixed and movably sleeved on the outer wall of the connecting rod neck through the fixing piece 403, the arc-shaped seat one 401, the arc-shaped seat two 402 and the fixing piece 403 cooperatively form a circular ring structure, so as to be installed on or removed from the connecting rod neck, for example, the fixing piece 403 is a bolt or a buckle; the arc-shaped polishing piece 404 is rotatably arranged in the arc-shaped seat one 401 and the arc-shaped seat two 402, the arc-shaped polishing pieces 404 of the arc-shaped seat one 401 and the arc-shaped seat two 402 are detachably connected to form a polishing ring for polishing the outer wall of the connecting rod neck, the arc-shaped polishing piece 404 can be matched with the arc-shaped sliding groove opened in the inner wall of the arc-shaped seat one 401 and the arc-shaped seat two 402 through the sliding block, so that the polishing ring formed by the two arc-shaped polishing pieces 404 can rotate relative to the arc-shaped seat one 401 and the arc-shaped seat two 402;

[0055] The arc-shaped polishing piece 404 is vertically provided with the polishing sheet one 417 for polishing the surface wall of the crank web on both ends of the axis of the arc-shaped polishing piece 404, from the attached Figure 1 As can be seen, in the initial state, the polishing sheet one 417 on one side of the arc-shaped polishing piece 404 is in contact with the surface wall of the crank web at one end of the connecting rod neck, and the surface wall of the crank web at one end of the connecting rod neck is polished first, and then the position of the clamped crankshaft is adjusted through the driving piece 300, so that the polishing sheet one 417 on the other side of the arc-shaped polishing piece 404 is in contact with the surface wall of the crank web at the other end of the connecting rod neck; and,

[0056] The mounting seat 405 is fixedly arranged at the bottom of the arc-shaped seat 401, and one end of the connecting rod 406 connected with the rotating shaft is arranged in the mounting seat 405. The other end of the connecting rod 406 is provided with a piston 407. The piston 407 is movably arranged in a cylinder 408. The cylinder 408 is arranged on the workbench 100. One side of the cylinder 408 is provided with a one-way air inlet pipe 409. The one-way air inlet pipe 409 is a pipeline with a one-way valve. A flow-through cavity 410 is further arranged in the cylinder 408. The flow-through cavity 410 and the inner cavity of the cylinder 408 are connected through an air inlet port. The flow-through cavity 410 is connected with a gas-driven assembly through an exhaust pipe 411. The gas-driven assembly is arranged in the mounting seat 405 and is used to drive the polishing ring to rotate. When the clamped crankshaft rotates, the connecting rod 406 is driven to move the piston 407 reciprocatingly in the cylinder 408. The external air is first introduced into the cylinder 408 through the one-way air inlet pipe 409 and then is pressed into the flow-through cavity 410 from the air inlet port by the piston 407. Then the air is introduced into the gas-driven assembly through the exhaust pipe 411, so that the gas-driven assembly drives the polishing ring to rotate on the outer wall of the connecting rod neck and polish the outer wall of the connecting rod neck.

[0057] As preferred, the gas-driven assembly of the embodiment comprises:

[0058] A guide shell 412 is arranged in the mounting seat 405. The guide shell 412 is provided with an air outlet end and an air inlet end connected with the exhaust pipe 411. The air discharged through the exhaust pipe 411 enters the guide shell 412 and is then discharged from the air outlet end.

[0059] A guide impeller 413 is arranged in the guide shell 412 through a rotating shaft 414. The air supplied from the air inlet end drives the guide impeller 413 to rotate. One end of the rotating shaft 414 is movably arranged through the guide shell 412 and is fixedly sleeved with a gear 415. In addition,

[0060] A gear ring 416 comprises two arc-shaped racks. The two groups of arc-shaped racks are arranged in the arc-shaped grooves arranged on the outer walls of the arc-shaped seat one 401 and the arc-shaped seat two 402, respectively.

[0061] One end of the gear 415 is arranged through the movable port arranged on the arc-shaped seat one 401 and is engaged with the gear ring 416. The air discharged through the exhaust pipe 411 drives the guide impeller 413 after entering the guide shell 412. The guide impeller 413 drives the rotating shaft 414. The rotating shaft 414 drives the gear 415 to drive the gear ring 416. In turn, the gear ring 416 drives the polishing ring to rotate.

[0062] As preferred, a support bump is fixed in the flow cavity 410 of the embodiment, and an elastic member one 419 is arranged on the side of the support bump facing the air inlet, and a sealing plate 418 is arranged on the elastic member one 419, the diameter of the sealing plate 418 is greater than the diameter of the air inlet and less than the inner diameter of the flow cavity 410. In the initial state, the sealing plate 418 closes the air inlet, when the piston 407 is pressed into the gas, with the increase of the gas pressure in the cylinder 408, the sealing plate 418 is further driven to press the elastic member one 419 away from the air inlet, so that the gas enters the flow cavity 410, which on the one hand plays a role in increasing the gas pressure, and on the other hand will not cause the air inlet to enter when the piston 407 resets.

[0063] Please refer to the accompanying drawings Figure 5

[0064] As preferred, the polishing assembly two 500 of the embodiment comprises:

[0065] A polishing wheel 501 is arranged at one end of the telescopic rod 504 and abuts against the main shaft neck, for polishing the surface wall of the main shaft neck of the crankshaft, and the other end of the telescopic rod 504 is connected with the workbench 100, as shown in the accompanying drawings Figure 1 As can be seen, the polishing wheel 501 corresponds to the middle position of the main shaft neck of the crankshaft in the initial state; and

[0066] Two groups of polishing sheets two 502 are arranged, and the two groups of polishing sheets two 502 are vertically arranged on both sides of the polishing wheel 501 respectively, and the two groups of polishing sheets two 502 are respectively in contact with the other side surface wall of the crank arm at both ends of the main shaft neck, for polishing the other side surface wall of the crank arm, the polishing assembly one 400 can only polish one side surface wall of the crank arm connected with the connecting rod neck, and the other side surface wall of the crank arm away from the connecting rod neck cannot be polished, therefore, the polishing sheets two 502 are used to polish it, and when the crankshaft rotates, the main shaft neck rotates, and the crank arm rotates with the main shaft neck as the point, so the polishing sheets two 502 can polish it;

[0067] The two groups of polishing sheets two 502 are respectively sleeved on the outer wall of the two guide rods 503, the guide rods 503 are horizontally arranged on the telescopic rod 504, the outer wall of the guide rod 503 is sleeved with an elastic member two 505, one end of the elastic member two 505 is connected with the polishing sheet two 502, and the other end is connected with the telescopic rod 504. Under the action of the elastic member two 505, the polishing sheet two 502 is attached to the other side surface wall of the crank arm, and it is also convenient for the driving member 300 to drive the clamped crankshaft to move horizontally, and the polishing wheel 501 polishes different positions of the surface wall of the main shaft neck.

[0068] The diesel engine crankshaft dead angle polishing device and polishing method, by using the above-mentioned polishing device, comprises the following steps:

[0069] S1: clamp the crankshaft to be polished by the clamping assembly 200, so that the arc-shaped seat one 401 on the polishing assembly one 400 corresponds to the connecting rod journal of the crankshaft, then install the arc-shaped seat two 402 on the arc-shaped seat one 401 through the fixing piece 403, at this time, adjust the telescopic rod 504 again so that the polishing wheel 501 contacts the main journal of the crankshaft, and the polishing sheet two 502 contacts the outer wall of the crank arm at the end of the main journal;

[0070] S2: open the rotating device 301, the rotating device 301 drives the clamping assembly 200 to rotate the clamped crankshaft, when the crankshaft rotates, the piston 407 is driven to reciprocate in the cylinder 408 through the mounting seat 405 and the connecting rod 406, so that the external air enters the cylinder 408 from the one-way air inlet pipe 409 and is then compressed to the flow cavity 410, and is discharged to the guide casing 412 through the exhaust pipe 411 to drive the guide impeller 413, the guide impeller 413 drives the rotating shaft 414 to drive the gear ring 416 through the gear 415, and then the polishing ring rotates relative to the surface wall of the connecting rod journal to polish the surface wall of the connecting rod journal, at the same time, the rotation of the polishing ring also drives the polishing sheet one 417 to rub the surface wall of the crank arm at one end of the connecting rod journal, and the polishing wheel 501 and the polishing sheet two 502 rub the main journal of the crankshaft and the outer wall of the crank arm on the other side at the end of the main journal when the crankshaft rotates;

[0071] S3: during polishing, the clamped crankshaft is horizontally moved by the telescopic device 302, so as to rub the surface wall of the crank arm at the other end of the connecting rod journal by the polishing sheet one 417 on the other side.

[0072] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A crankshaft polishing device for diesel engines with no dead angles, characterized in that, include: A worktable (100) is provided with a clamping assembly (200) for clamping a crankshaft and a drive unit (300) for driving the crankshaft clamped by the clamping assembly (200) to rotate or move horizontally. Polishing assembly 1 (400) is provided in several groups. One end of each group of polishing assembly 1 (400) is connected to the worktable (100), and the other end is respectively sleeved on one end of the connecting rod journal of the clamped crankshaft. It is used to polish the surface wall of the connecting rod journal and one side surface wall of the crank arm at the end of the connecting rod journal when the clamped crankshaft rotates or moves; and, Polishing component 2 (500) is provided in several groups. One end of each of the several groups of polishing component 2 (500) is connected to the worktable (100), and the other end is respectively in contact with the main journal of the clamped crankshaft. It is used to polish the surface wall of the main journal of the crankshaft and the surface wall of the crank arm at the end of the main journal when the clamped crankshaft rotates or moves. The polishing assembly (400) includes: an arc-shaped seat (401), on which arc-shaped seats (402) are symmetrically arranged; the arc-shaped seats (401) and the arc-shaped seats (402) are fixed and movably sleeved on the outer wall of the connecting rod neck by a fixing member (403); an arc-shaped polishing part (404) is rotatably arranged inside the arc-shaped seats (401) and the arc-shaped seats (402); the arc-shaped polishing parts (404) of the arc-shaped seats (401) and the arc-shaped seats (402) are detachably connected to form a polishing ring for polishing the outer wall of the connecting rod neck; and polishing discs (417) for polishing the surface wall of the crank arm are vertically arranged at both ends of the arc-shaped polishing part (404) on its axis; and a mounting base (405). A rotating shaft is fixed at the bottom of the arc-shaped seat (401), and one end of the connecting rod (406) is connected to the rotating shaft inside the mounting base (405). The other end of the connecting rod (406) is provided with a piston (407). The piston (407) is movably disposed inside the cylinder (408). The cylinder (408) is disposed on the worktable (100). One side of the cylinder (408) is provided with a one-way air inlet pipe (409). A flow chamber (410) is also provided inside the cylinder (408). The flow chamber (410) and the inner cavity of the cylinder (408) are connected through an air inlet. The flow chamber (410) is connected to a gas-driven component through an exhaust pipe (411). The gas-driven component is disposed inside the mounting base (405) and is used to drive the polishing ring to rotate. The gas-driven assembly includes: a guide housing (412) disposed within a mounting base (405), the guide housing (412) having an outlet end and an inlet end communicating with an exhaust pipe (411); a guide impeller (413) disposed within the guide housing (412) via a rotating shaft (414), driven to rotate by gas supplied from the inlet end, one end of the rotating shaft (414) movably penetrating the guide housing (412) and fixedly fitted with a gear (415); and a gear ring (416), the gear ring (416) including two arc-shaped racks, the two sets of arc-shaped racks being respectively disposed in arc-shaped grooves opened on the outer walls of arc-shaped seat one (401) and arc-shaped seat two (402); one end of the gear (415) passing through a movable opening opened on arc-shaped seat one (401) and meshing with the gear ring (416); A support protrusion is fixedly provided in the flow cavity (410). A sealing plate (418) is provided on the side of the support protrusion facing the air inlet through an elastic element (419). The diameter of the sealing plate (418) is larger than the diameter of the air inlet and smaller than the inner diameter of the flow cavity (410).

2. The polishing apparatus according to claim 1, characterized in that: The polishing assembly two (500) includes: A polishing wheel (501), located at one end of the telescopic rod (504) and abutting against the main journal, is used to polish the surface of the crankshaft's main journal. The other end of the telescopic rod (504) is connected to the worktable (100); and, Polishing disc 2 (502) is provided in at least two sets. The two sets of polishing disc 2 (502) are respectively vertically arranged on both sides of the polishing wheel (501). The two sets of polishing disc 2 (502) are respectively in contact with the other side surface wall of the crank arm at both ends of the main journal, and are used to polish the other side surface wall of the crank arm. The two sets of polishing disc 2 (502) are respectively sleeved on the outer wall of the two guide rods (503). The guide rods (503) are horizontally arranged on the telescopic rod (504). The outer wall of the guide rod (503) is sleeved with an elastic element 2 (505). One end of the elastic element 2 (505) is connected to the polishing disc 2 (502), and the other end is connected to the telescopic rod (504).

3. The polishing apparatus according to claim 2, characterized in that: The drive unit (300) includes: A rotating device (301) is slidably mounted on a worktable (100) via a mounting base, and the output end of the rotating device (301) is connected to a clamping assembly (200); and, The telescopic device (302) is connected to the workbench (100) at one end and to the assembly base at the other end.

4. A polishing method using a diesel engine crankshaft polishing device with no dead angles, utilizing the polishing device as described in claim 3, characterized in that: Includes the following steps: S1: The crankshaft to be polished is clamped by the clamping assembly (200) so that the arc seat one (401) on the polishing assembly one (400) corresponds to the connecting rod journal of the crankshaft. Then, the arc seat two (402) is installed on the arc seat one (401) by the fixing piece (403). At this time, the telescopic rod (504) is adjusted so that the polishing wheel (501) contacts the main journal of the crankshaft and the polishing disc two (502) contacts the outer wall of the crank arm at the end of the main journal. S2: By opening the rotating device (301), the rotating device (301) drives the clamping assembly (200) to rotate the clamped crankshaft. When the crankshaft rotates, it drives the piston (407) to reciprocate within the cylinder (408) via the mounting base (405) and connecting rod (406). This causes outside air to enter the cylinder (408) through the one-way intake pipe (409) and then be compressed into the flow chamber (410), and discharged through the exhaust pipe (411) into the guide housing (412) to drive the crankshaft. The guide impeller (413) drives the rotating shaft (414) so ​​that the gear (415) drives the gear ring (416), and then the polishing ring rotates relative to the surface wall of the connecting rod journal to polish the surface wall of the connecting rod journal. At the same time, the rotation of the polishing ring also drives the polishing disc one (417) to rub the surface wall of the crank arm at the end of the connecting rod journal. The polishing wheel (501) and the polishing disc two (502) rub the main journal of the crankshaft and the outer wall of the crank arm on the other side of the main journal when the crankshaft rotates. S3: During polishing, the clamped crankshaft is moved horizontally by the telescopic device (302) so that the surface of the crank arm at the other end of the connecting rod neck is rubbed by the polishing disc (417) on the other side.

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