Crankshaft and crank pin machining tool

Abstract

The invention relates to the technical field of crankshaft and crank pin machining, in particular to a crankshaft and crank pin machining tool. Comprising an installation box installed on a clamping base, two sets of clamping plates installed on the installation box and used in cooperation with an engine crankshaft, clamping blocks fixedly connected to the inner sides of the two sets of clamping plates correspondingly, clamping grooves formed in the clamping blocks, tightening wheels arranged below the bottom clamping plate and conveying wheels arranged on the installation box. The polishing device comprises a clamping plate, a tightening wheel arranged on the clamping plate, a conveying wheel arranged on the clamping plate, a polishing belt conveyed between the tightening wheel and the conveying wheel, a guiding assembly arranged on the clamping plate, an abutting assembly arranged on a clamping block, an anti-disengaging assembly arranged on the abutting assembly and a water spraying assembly arranged on the abutting assembly. And along with ascending of the abutting assembly, the anti-disengaging assembly buckles and locks the two sets of clamping plates, and the crank pin is prevented from being disengaged from the clamping blocks in the polishing process.

Description

Technical Field

[0001] This invention relates to the field of crankshaft and crankpin machining technology, specifically to a crankshaft and crankpin machining tool. Background Technology

[0002] The crankshaft is one of the core components of an engine. Its main function is to convert the reciprocating motion of the piston into rotational motion via the connecting rod and output power. As an important part of the crankshaft, the machining accuracy of the crankpin directly affects the engine's performance and reliability. In the traditional machining process of crankshafts and crankpins, a variety of machining processes are usually used, such as turning, milling, and polishing.

[0003] When polishing a crankshaft, the main components are the main journals and crankpins. The purpose is to reduce surface roughness, improve wear resistance, and enhance lubrication. Existing polishing machines polish the crankpins and main journals by clamping the crankshaft in a holder, and then using multiple sets of hydraulic clamps to hold the main journals and crankpins respectively, causing the crankshaft to rotate around the main journals. During the polishing process, a polyester film polishing strip with a certain degree of toughness is often used as the polishing medium. Since the crankshaft rotates around the main journals during polishing, while the crankpins are an eccentric part of the crankshaft, and current technology only uses hydraulic clamps to hold the main journals and crankpins, the upper and lower sets of clamps... The hinge point between the crank pins is far from the clamping point. Therefore, during the polishing process, as the speed at which the crankshaft rotates driven by the clamping blocks on the crank pin increases, the centrifugal force generated by the crank pin becomes greater, and the release force that the clamping blocks on the crank pin need to withstand becomes greater. In order to meet the processing efficiency, when the crankshaft speed is too high, the clamping blocks will not be able to withstand the release force, resulting in vibration, or even falling off the crank pin. This will lead to processing accidents, or even scrap the crankshaft. At the same time, as the speed at which the clamping blocks drive the crank pin to rotate around the main journal increases, the centrifugal force generated by the crank pin can easily cause the polishing belt to loosen when it contacts the surface of the crank pin. As a result, it will be driven along with the movement of the crank pin, and after multiple cycles, it will fold, causing processing accidents.

[0004] To address this, a machining tool for crankshafts and crank pins is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a crankshaft and crank pin machining tool that solves the problems of unstable clamping by the clamping blocks on the crank pin and easy folding of the polishing belt during the polishing process, as the crankshaft rotation speed increases. By using the clamping blocks to clamp the main journal and crank pin on the crankshaft, the upward movement of the motor-driven pressing component can press against the polishing belt, preventing displacement and folding of the polishing belt during the polishing process. Furthermore, as the pressing component rises, the anti-detachment component will fasten and lock the two sets of clamping plates, preventing the crank pin from detaching from the clamping blocks during the polishing process. The fastening process further improves the clamping effect on the polishing belt, further preventing displacement of the polishing belt.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A crankshaft and crankpin machining tool includes a mounting box mounted on a clamping base, two sets of clamping plates mounted on the mounting box and used in conjunction with an engine crankshaft, clamping blocks fixedly connected to the inner sides of the two sets of clamping plates, clamping grooves formed in the clamping blocks, a tightening wheel disposed below the bottom clamping plate, a conveying wheel disposed on the mounting box, and a polishing belt conveyed between the tightening wheel and the conveying wheel. It also includes a guide assembly disposed on the clamping plates, a pressing assembly disposed on the clamping blocks, an anti-detachment assembly disposed on the pressing assembly, and a water spray assembly disposed on the pressing assembly. The pressing assembly, located on the left half of the clamping block, clamps and fixes the polishing belt to prevent displacement and folding during polishing. The anti-detachment assembly opens and locks the clamping block as the pressing assembly rises, preventing the crankpin from detaching from the clamping block during polishing. The water spray assembly moves with the pressing assembly, and when the anti-detachment assembly opens, the water spray assembly extends between the polishing belt and the clamping grooves, allowing for more precise delivery of water to the main journals and crankpins on the crankshaft and reducing water splashing.

[0008] Preferably, the guiding assembly includes a guide wheel shaft one rotatably connected to the outer ends of the two sets of clamping plates, a guide wheel shaft two rotatably connected to the inner sides of the two sets of clamping plates, and a guide wheel shaft three disposed at the top of the upper clamping plate. The polishing belt is discharged from the conveyor wheel and passes sequentially through the guide wheel shaft three at the top of the upper clamping plate, the guide wheel shaft one of the upper clamping plate, the guide wheel shaft two at the bottom of the upper clamping plate, the guide wheel shaft two of the lower clamping plate, and the guide wheel shaft one of the lower clamping plate, and is then tightened by the tightening wheel.

[0009] Preferably, the pressing assembly includes a groove on the clamping block, a top block slidably connected to the groove, a threaded rod rotatably connected to the bottom of the top block, a rectangular rod fixedly connected to the bottom of the threaded rod, a motor fixedly connected to the bottom of the clamping plate, a rectangular slot on the motor output shaft, a groove on the top block, a push block slidably connected to the groove, a spring installed between the push block and the groove, and an abutment fixedly connected to the bottom of the upper clamping block; the rectangular rod is slidably connected to the rectangular slot on the motor output shaft, and the threaded rod is threadedly connected to the clamping plate; when the motor is working, the motor output shaft will drive the threaded rod to rotate, and the threaded rod will move upward relative to the clamping plate during rotation, pushing the top block and the push block to rise simultaneously. When the push block rises to the abutment, the spring will be gradually compressed, and at this time the polishing belt will be clamped between the push block and the abutment.

[0010] Preferably, the abutment includes a fixing block fixedly connected to the bottom of the clamping block, a U-shaped groove formed on the fixing block, and slots formed on both sides of the U-shaped groove. When the push block pushes the polishing belt up into the U-shaped groove, the polishing belt will deform and be clamped between the U-shaped groove and the push block, thereby increasing the friction between the polishing belt and the U-shaped groove.

[0011] Preferably, the first spring is a rigid spring and there are four sets, which are located at the four right angles of the push block. During the process of the push block driving the polishing belt to rise, the first spring, being a rigid spring, will not be deformed by the pressure of the polishing belt, and the arrangement of the four sets of the first spring can ensure uniform force distribution.

[0012] Preferably, the anti-detachment component includes a through groove on the push block, two sets of insert blocks slidably connected to the through groove, a rack fixedly connected to the insert blocks, a gear rotatably connected to the center of the through groove, a connecting rod fixedly connected to the bottom of the gear, an insert plate fixedly connected to the bottom of the connecting rod, a hollow groove in the threaded rod, a connecting groove at the bottom of the hollow groove, and a limiting member on the push block; the gear simultaneously meshes with both sets of racks; the connecting rod is rotatably connected to the push block; the insert plate is rotatably connected to the hollow groove; when the top block moves upward relative to the push block, the insert plate will engage with the connecting rod. The slots are inserted into each other. After insertion, the threaded rod will drive the connecting rod to rotate simultaneously. In turn, the connecting rod will drive the gear to rotate. The rotating gear will drive the insert block to open and insert into the slot. During the insertion process, the top block will continue to rise under the drive of the threaded rod. After full insertion, the two sides of the top block will push the polishing belt to abut against the bottom sides of the fixed block. The limiting part will also be inserted into the limiting slot. At this time, the top block will be limited by the limiting block and cannot move downward relative to the push block when subjected to tension. The lower clamping block will also be fastened to the upper clamping block through the insertion of the insert block and the slot.

[0013] Preferably, the insert plate is V-shaped, with the maximum width of the insert plate being equal to the width of the connecting groove, and the thickness of the insert plate being less than the thickness of the connecting groove; as the threaded rod gradually rises, the bottom of the insert plate will gradually insert into the connecting groove until the insert plate is completely inserted into the connecting groove as the threaded rod rotates and rises.

[0014] Preferably, the limiting component includes a fixed rod fixedly connected to the bottom of the insert block, a limiting block slidably connected to the bottom of the fixed rod, an elastic element two installed between the limiting block and the fixed rod, and a limiting groove opened on the top block. During the opening of the insert block, the limiting block will move simultaneously. When the limiting block moves to the side wall of the groove, it will gradually retract into the fixed rod until the threaded rod pushes the top block to drive the polishing belt to rise and abut against the planes on both sides of the fixed block. At this point, the insert block will be fully opened, and the limiting block will also be in the limiting groove and inserted into the limiting groove by the pushing force of the elastic element two.

[0015] Preferably, the water spraying assembly includes a nozzle fixedly connected to the outside of the push block, and a spiral water pipe fixedly connected to the nozzle; the end of the nozzle is inclined, and when the push block rises to the top position, the nozzle will be on the center horizontal line between the upper clamping block and the lower clamping block, and the end of the nozzle will be between the polishing belt and the crank pin. When spraying water, water will be injected from one end of the crank pin axis to the other end, which can facilitate the removal of grinding debris during the polishing process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Driven by the motor output shaft, the threaded rod of this invention pushes the top block and the push block upwards simultaneously. When the push block rises into the U-shaped groove, the polishing belt deforms and is clamped between the U-shaped groove and the push block, increasing the friction between the polishing belt and the U-shaped groove and further tightening the fit between the polishing belt and the crank pin. Simultaneously, the threaded rod continues to drive the top block closer to the push block, causing the insert plate to gradually engage with the connecting groove. After engagement, the threaded rod drives the connecting rod to rotate simultaneously, thus pushing the insert block open and engage with the slot as the top block rises. During the slot insertion process, the top block will continue to rise driven by the threaded rod. After complete insertion, the two side planes of the top block will also push the polishing belt to press against the bottom planes of the two sides of the fixed block. At this time, the polishing belt is also pressed against the U-shaped groove and slot at the same time. The tightening wheel will also remain in a stopped state, so the polishing belt will not be able to move. This effectively prevents the polishing belt from loosening when it comes into contact with the crank pin surface due to the large centrifugal force of the crank pin when the clamping block quickly pushes the crank pin to rotate around the main journal. This would cause the polishing belt to fold after multiple cycles, resulting in an operational accident.

[0018] 2. During the opening of the insert block, the limiting block will move simultaneously. When the limiting block moves to the side wall of the groove, it will gradually retract into the fixing rod until the threaded rod pushes the top block to drive the polishing belt to rise and abut against the planes on both sides of the fixing block. At this time, the insert block will be fully opened, and the limiting block will also be in the limiting groove. It will be pushed into the limiting groove by the elastic element two. At this time, the motor output shaft will remain in a stopped state. Under the action of the limiting block and the insert block, the top block, the push block and the clamping plate will be fixed and cannot move, thereby completing the locking of the clamping block. This prevents the crank pin from disengaging from the clamping block as the centrifugal force of the crank pin increases during the rapid rotation of the crank pin around the main journal, thus improving the stability of the polishing machine.

[0019] 3. When the push block rises to the top position, the nozzle will be on the center horizontal line between the upper and lower clamping blocks, and the end of the nozzle will be between the polishing belt and the crank pin. When spraying water, water will be injected from one end of the crank pin axis to the other end, which can facilitate the removal of grinding debris during the polishing process. When the top block and push block complete the clamping of the polishing belt, the polishing belt on the left side of the crank pin on the crankshaft will close. With the obstruction of the cranks on both sides of the crank pin, unlike the existing polishing belt opening and nozzle open spraying method, it can effectively reduce water splashing and improve the water utilization rate during polishing operations. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the overall appearance of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the clamping plate and the engine crankshaft of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the guide component of the present invention;

[0023] Figure 4 This is a cross-sectional view of the clamping block and clamping plate of the present invention;

[0024] Figure 5 This is an enlarged cross-sectional view of the pressure-retaining component of the present invention;

[0025] Figure 6 This is a cross-sectional view of the anti-detachment component of the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0027] Figure 8 This is a three-dimensional structural diagram of the water spray assembly of the present invention;

[0028] Figure 9 This is a three-dimensional cross-sectional structural diagram of the top block and push block of the present invention;

[0029] Figure 10 This is a three-dimensional cross-sectional structural diagram of the threaded rod of the present invention.

[0030] In the diagram: 1. Mounting box; 11. Clamping plate; 12. Clamping block; 13. Clamping groove; 14. Tensioning wheel; 15. Conveying wheel; 16. Polishing belt; 2. Engine crankshaft; 3. Guide assembly; 31. Guide wheel shaft one; 32. Guide wheel shaft two; 33. Guide wheel shaft three; 4. Pressing assembly; 41. Slide groove; 42. Top block; 43. Threaded rod; 44. Rectangular rod; 45. Motor; 46. Rectangular groove; 47. Groove; 48. Push block; 49. Spring 1. 410. Abutment component; 4101. Fixing block; 4102. U-shaped groove; 4103. Slot; 5. Anti-detachment component; 51. Through groove; 52. Insert block; 53. Rack; 54. Gear; 55. Connecting rod; 56. Insert plate; 57. Empty groove; 58. Connecting groove; 59. Limiting component; 591. Fixing rod; 592. Limiting block; 593. Elastic component; 594. Limiting groove; 6. Water spray component; 61. Nozzle; 62. Spiral water pipe. Detailed Implementation

[0031] 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.

[0032] Please see Figures 1 to 10 This invention provides a crankshaft and crank pin machining tool, the technical solution of which is as follows:

[0033] As one embodiment of the present invention, refer to Figures 1 to 3A crankshaft and crank pin machining tool includes a mounting box 1 mounted on a clamping base, two sets of clamping plates 11 mounted on the mounting box 1 and used in conjunction with an engine crankshaft 2, wherein the engine crankshaft 2 is clamped on the clamping base and rotatably connected thereto, the clamping plates 11 are hydraulically driven to open and close, clamping blocks 12 are respectively fixedly connected to the inner sides of the two sets of clamping plates 11, clamping grooves 13 are formed in the clamping blocks 12, the main journal and crank pin of the crankshaft are clamped by the clamping blocks 12, a tightening wheel 14 is arranged below the bottom clamping plate 11, a conveying wheel 15 is arranged on the mounting box 1, and a polishing belt 16 is conveyed between the tightening wheel 14 and the conveying wheel 15. The polishing belt 16 is made of polyester film material with a certain elasticity, and also includes a guide assembly 3 arranged on the clamping plate 11 and a retaining assembly 3 arranged on the clamping block 12. The components include a pressure assembly 4, an anti-detachment assembly 5 mounted on the pressure assembly 4, and a water spray assembly 6 mounted on the pressure assembly 4. When the clamping block 12 has finished clamping the main journal and crank pin on the crankshaft, the pressure assembly 4 can be activated to rise and press and clamp the polishing belt 16 to prevent displacement and folding of the polishing belt 16 during polishing. During the rise of the pressure assembly 4, the anti-detachment assembly 5 will automatically open and lock the clamping plate 11 to prevent the crank pin from detaching from the clamping block 12 during polishing. The water spray assembly 6 will move along with the rise of the pressure assembly 4. When the pressure assembly 4 rises to the top, the water spray assembly 6 will be located between the polishing belt 16 and the clamping groove 13, which can more accurately deliver water to the main journal and crank pin on the crankshaft and reduce water splashing.

[0034] As one embodiment of the present invention, refer to Figure 3 The guide assembly 3 includes a guide wheel shaft 31 rotatably connected to the outer ends of the two sets of clamping plates 11, a guide wheel shaft 32 rotatably connected to the inner sides of the two sets of clamping plates 11, and a guide wheel shaft 33 disposed on the top of the upper clamping plate 11. The polishing belt 16 is discharged from the conveying wheel 15 and passes sequentially through the guide wheel shaft 33 on the top of the upper clamping plate 11, the guide wheel shaft 31 on the upper clamping plate 11, the guide wheel shaft 32 on the bottom of the upper clamping plate 11, the guide wheel shaft 32 on the lower clamping plate 11, and the guide wheel shaft 31 on the lower clamping plate 11, and is then tightened by the tightening wheel 14.

[0035] As one embodiment of the present invention, refer to Figure 4 and Figure 5The pressing assembly 4 includes a groove 41 formed on the clamping block 12, a top block 42 slidably connected to the groove 41, a threaded rod 43 rotatably connected to the bottom of the top block 42, a rectangular rod 44 fixedly connected to the bottom of the threaded rod 43, a motor 45 fixedly connected to the bottom of the clamping plate 11, a rectangular groove 46 formed on the output shaft of the motor 45, a recess 47 formed on the top block 42, a push block 48 slidably connected to the recess 47, a spring 49 installed between the push block 48 and the groove 41, and an abutment 410 fixedly connected to the bottom of the upper clamping block 12; the rectangular rod 44 and the motor 45 are connected to the top block 12. The rectangular slot 46 on the output shaft is slidably connected, and the threaded rod 43 is threadedly connected to the clamping plate 11. When the motor 45 is working, the output shaft of the motor 45 will drive the threaded rod 43 to rotate. During the rotation, the threaded rod 43 will move upward relative to the clamping plate 11 and push the top block 42 to rise. The top block 42 will push the push block 48 to rise at the same time. When the push block 48 rises to the abutment 410, the push block 48 will abut against the abutment 410 and stop rising. The top block 42 will continue to rise, and the spring 49 will be gradually compressed. At this time, the polishing belt 16 will be clamped between the push block 48 and the abutment 410.

[0036] As one embodiment of the present invention, refer to Figure 4 The abutment 410 includes a fixing block 4101 fixedly connected to the bottom of the clamping block 12, a U-shaped groove 4102 formed on the fixing block 4101, and slots 4103 formed on both sides of the U-shaped groove 4102. When the push block 48 pushes the polishing belt 16 up into the U-shaped groove 4102, the polishing belt 16 will deform and be clamped between the U-shaped groove 4102 and the push block 48. The polishing belt 16 will bend along the contour of the push block 48 and the U-shaped groove 4102, thereby increasing the friction between the polishing belt 16 and the U-shaped groove 4102.

[0037] As one embodiment of the present invention, refer to Figure 5 Spring 49 is a rigid spring and there are four sets of them, located at the four right angles of push block 48. During the process of push block 48 driving polishing belt 16 to rise, spring 49 will not be deformed due to the pressure of polishing belt 16. It will only be compressed when push block 48 abuts against the top of U-shaped groove 4102 and motor 45 drives top block 42 to move relative to push block 48. The setting of four sets of spring 49 can ensure uniform force distribution.

[0038] As one embodiment of the present invention, refer to Figures 6 to 10The anti-detachment component 5 includes a through groove 51 on the push block 48, two sets of insert blocks 52 slidably connected to the through groove 51, a rack 53 fixedly connected to the insert blocks 52, a gear 54 rotatably connected to the center of the through groove 51, a connecting rod 55 fixedly connected to the bottom of the gear 54, an insert plate 56 fixedly connected to the bottom of the connecting rod 55, a hollow groove 57 in the threaded rod 43, the hollow groove 57 being a cylindrical insert plate 56 that can rotate within the hollow groove 57, and a connecting groove 58 at the bottom of the hollow groove 57, the connecting groove 58 being a rectangular insert plate 56 that can be inserted into it. And a limiting member 59 is provided on the push block 48; the gear 54 meshes with two sets of racks 53 at the same time, and the ends of the racks 53 extend into the opposing inserts 52; the connecting rod 55 is rotatably connected to the push block 48; the insert plate 56 is rotatably connected in the slot 57; during the process of the motor 45 driving the top block 42 and the push block 48 to rise, only the threaded rod 43 rotates. During this process, the insert plate 56 will be in the slot 57 of the threaded rod 43, so the connecting rod 55 will not rotate. When the push block 48 rises to the top of the U-shaped groove 4102, the top block 42 will be relatively As the push block 48 moves upward, the threaded rod 43 also moves upward relative to the connecting rod 55. This causes the insert plate 56 to engage with the connecting slot 58. After engagement, the threaded rod 43 drives the connecting rod 55 to rotate simultaneously. The connecting rod 55 then drives the gear 54 to rotate. The rotating gear 54 drives the two sets of racks 53 to move in opposite directions, thus pushing the insert block 52 to open and engage with the slot 4103. During the engagement of the insert block 52 with the slot 4103, the top block 42 continues to rise under the drive of the threaded rod 43. After full engagement... The two sides of the top block 42 will push the polishing belt 16 to abut against the bottom sides of the fixed block 4101, clamping the polishing belt 16, thereby completing the position limitation between the push block 48 and the top block 42. After the insert block 52 is fully inserted into the slot 4103, the limiting member 59 will also be inserted into the limiting groove 594. At this time, the top block 42 will be limited by the limiting block 592 and cannot move downward relative to the push block 48 when it is pulled. The lower clamping block 12 will also be fastened to the upper clamping block 12 through the insertion of the insert block 52 into the slot 4103.

[0039] As one embodiment of the present invention, refer to Figure 9 The insert plate 56 is V-shaped, and the maximum width of the insert plate 56 is equal to the width of the connecting groove 58, and the thickness of the insert plate 56 is less than the thickness of the connecting groove 58. As the threaded rod 43 gradually rises, the bottom of the insert plate 56 will gradually insert into the connecting groove 58 until the insert plate 56 is fully inserted into the connecting groove 58 as the threaded rod 43 rotates. At this time, the rotating threaded rod 43 will drive the connecting rod 55 to rotate together through the insert plate 56, which in turn drives the gear 54 to drive the insert block 52 to open.

[0040] As one embodiment of the present invention, refer to Figure 7 and Figure 9 The limiting member 59 includes a fixing rod 591 fixedly connected to the bottom of the insert block 52, a groove matching the fixing rod 591 in the push block 48 for sliding, a limiting block 592 slidably connected to the bottom of the fixing rod 591, an elastic member 593 installed between the limiting block 592 and the fixing rod 591, and a limiting groove 594 opened on the top block 42. During the opening of the insert block 52, the limiting block 592 will move simultaneously. When the limiting block 592 moves to the side wall of the groove 47, it will gradually retract into the fixing rod 591 until... When the threaded rod 43 pushes the top block 42 to raise the polishing belt 16 to abut against the planes on both sides of the fixed block 4101, the insert block 52 will fully open, and the limiting block 592 will also be in the limiting groove 594 and will be pushed into the limiting groove 594 by the elastic element 593. At this time, the output shaft of the motor 45 will remain in a stopped state. Under the action of the limiting block 592 and the insert block 52, the top block 42, the push block 48 and the clamping plate 11 will be fixed and cannot move, thereby completing the locking of the clamping block 12 and preventing the crank pin from disengaging from the clamping block 12 during the polishing process.

[0041] As one embodiment of the present invention, refer to Figure 7 and Figure 8 The water spray assembly 6 includes a nozzle 61 fixedly connected to the outside of the push block 48, and a spiral water pipe 62 fixedly connected to the nozzle 61. The spiral water pipe 62 can be extended. The end of the nozzle 61 is inclined. When the push block 48 rises to the top position, the nozzle 61 will be on the center horizontal line between the upper clamping block 12 and the lower clamping block 12, and the end of the nozzle 61 will be between the polishing belt 16 and the crank pin. When spraying water, water will be injected from one end of the crank pin axis to the other end, which can facilitate the removal of grinding debris during the polishing process. When the top block 42 and the push block 48 finish clamping the polishing belt 16, the polishing belt 16 on the left side of the crank pin on the crankshaft will close. Unlike the existing open method, the closed polishing belt 16 can reduce water splashing and improve water utilization.

[0042] Working principle: Refer to Figures 5 to 7After the clamping block 12 has finished clamping the main journal and crank pin on the crankshaft, the motor 45 can be started. The output shaft of the motor 45 will drive the threaded rod 43 to rotate. The threaded rod 43 is threadedly connected to the clamping plate 11. During the rotation, the threaded rod 43 will move upward relative to the clamping plate 11 and push the top block 42 upward. Under the action of the spring 49 pushing the push block 48, the top block 42 will push the push block 48 upward at the same time. When the push block 48 rises into the U-shaped groove 4102, the polishing belt 16 will... The polishing belt 16 is clamped between the U-shaped groove 4102 and the push block 48 (at this time, the polishing belt 16 will tighten). The polishing belt 16 will bend and deform along the contour of the push block 48 and the U-shaped groove 4102, increasing the friction between the polishing belt 16 and the U-shaped groove 4102. At the same time, the threaded rod 43 will continue to rotate and rise, driving the top block 42 to move closer to the push block 48. Then, the insert plate 56 will gradually insert into the connecting groove 58. After insertion, the threaded rod 43 will drive the connecting rod 55 to rotate simultaneously. Then the connecting rod 55 will drive the gear 54 to rotate. The rotating gear 54 will drive the two sets of racks 53 to move in opposite directions, thereby pushing the insert 52 to open and insert into the slot 4103. During the insertion of the insert 52 into the slot 4103, the top block 42 will continue to rise under the drive of the threaded rod 43. After the insert 52 is fully inserted, the two sides of the top block 42 will also push the polishing belt 16 to press against the bottom sides of the fixed block 4101. At this time, the polishing belt 16 is also pressed against the U-shaped groove 4102 and the slot 4103. The tightening wheel 14 will also remain in a stopped state. As a result, the polishing belt 16 will not be able to move and will be in a taut state. This can effectively prevent the polishing belt 16 from loosening when it contacts the crank pin surface when the clamping block 12 is subjected to a large centrifugal force from the crank pin when it is rapidly pushed by the clamping block 12 to rotate around the main journal. This would cause the polishing belt 16 to fold and cause an accident after multiple cycles.

[0043] Reference Figure 7 and Figure 9 During the opening of the insert block 52, the limiting block 592 will move simultaneously. When the limiting block 592 moves to the side wall of the groove 47, it will gradually retract into the fixing rod 591 until the threaded rod 43 pushes the top block 42 to raise the polishing belt 16 to abut against the planes on both sides of the fixing block 4101. At this time, the insert block 52 will be fully opened, and the limiting block 592 will also be in the limiting groove 594. It will be pushed into the limiting groove 594 by the elastic element 593. At this time, the output shaft of the motor 45 will remain in a stopped state. Under the action of the limiting block 592 and the insert block 52, the top block 42, the push block 48 and the clamping plate 11 will be fixed and cannot move, thereby completing the locking of the clamping block 12 and preventing the crank pin from disengaging from the clamping block 12 during the polishing process.

[0044] Reference Figure 7 and Figure 8Furthermore, when the push block 48 rises to the top position, the nozzle 61 will be on the center horizontal line between the upper clamping block 12 and the lower clamping block 12, and the end of the nozzle 61 will be between the polishing belt 16 and the crank pin. When spraying water, water will be injected from one end of the crank pin axis to the other end, which can facilitate the removal of grinding debris during the polishing process. When the top block 42 and the push block 48 finish clamping the polishing belt 16, the polishing belt 16 on the left side of the crank pin on the crankshaft will close. With the obstruction of the cranks on both sides of the crank pin, unlike the existing method of the polishing belt 16 being open and the nozzle 61 spraying in an open manner, the splashing of water can be effectively reduced, and the utilization rate of water during the polishing operation can be improved.

[0045] Even though we have provided specific embodiments of the present invention, it should be clear to those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the fundamental principles and purpose of the invention. The scope of the present invention is not fixed but is ultimately determined by the claims contained in the patent documents and their equivalents. In short, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crankshaft and crankpin machining tool, comprising a mounting box (1) mounted on a clamping seat, two sets of clamping plates (11) mounted on the mounting box (1) and matched with an engine crankshaft (2), clamping blocks (12) fixedly connected to the inner sides of the two sets of clamping plates (11) respectively, clamping grooves (13) opened on the clamping blocks (12), a tightening wheel (14) arranged below the bottom clamping plate (11), a conveying wheel (15) arranged on the mounting box (1), and a polishing belt (16) conveyed between the tightening wheel (14) and the conveying wheel (15), characterized in that: Further include the guide assembly (3) arranged on the clamping plate (11), the pressing assembly (4) arranged on the clamping block (12), the anti-off assembly (5) arranged on the pressing assembly (4), and the water spraying assembly (6) arranged on the pressing assembly (4); The pressing assembly (4) is located on the left half of the clamping block (12) to clamp and fix the polishing belt (16); The anti-off assembly (5) is opened to lock the clamping block (12) during the rising of the pressing assembly (4); The water spraying assembly (6) moves with the movement of the pressing assembly (4), and when the anti-off assembly (5) is opened, the water spraying assembly (6) extends between the polishing belt (16) and the clamping groove (13).

2. A crankshaft and crankpin machining tool according to claim 1, wherein: The guide assembly (3) comprises a guide wheel shaft one (31) rotatably connected to the outer end of the two sets of clamping plates (11), a guide wheel shaft two (32) rotatably connected to the inner side of the two sets of clamping plates (11), and a guide wheel shaft three (33) arranged on the top of the upper clamping plate (11).

3. A crankshaft and crankpin machining tool according to claim 2, wherein: The pressing assembly (4) comprises a sliding groove (41) opened on the clamping block (12), a top block (42) slidably connected in the sliding groove (41), a threaded rod (43) rotatably connected to the bottom of the top block (42), a rectangular rod (44) fixedly connected to the bottom of the threaded rod (43), a motor (45) fixedly connected to the bottom of the clamping plate (11), a rectangular slot (46) opened on the output shaft of the motor (45), a recess (47) opened on the top block (42), a push block (48) slidably connected in the recess (47), a spring one (49) installed between the push block (48) and the sliding groove (41), and an abutting piece (410) fixedly connected to the bottom of the upper clamping block (12); The rectangular rod (44) is slidably connected with the rectangular slot (46) on the output shaft of the motor (45), and the threaded rod (43) is threadedly connected with the clamping plate (11).

4. A crankshaft and crankpin machining tool according to claim 3, wherein: The abutting piece (410) comprises a fixed block (4101) fixedly connected to the bottom of the clamping block (12), a U-shaped groove (4102) opened on the fixed block (4101), and an insertion slot (4103) opened on both sides of the U-shaped groove (4102).

5. A crankshaft and crankpin machining tool according to claim 4, wherein: The spring one (49) is a hard spring and is provided with four groups, respectively located at the four right angles of the push block (48).

6. A crankshaft and crankpin machining tool according to claim 5, wherein: The anti-off assembly (5) comprises a through groove (51) opened on the push block (48), two groups of insertion blocks (52) slidably connected in the through groove (51), a rack (53) fixedly connected to the insertion block (52), a gear (54) rotatably connected at the center position of the through groove (51), a connecting rod (55) fixedly connected to the bottom of the gear (54), an insertion plate (56) fixedly connected to the bottom of the connecting rod (55), an empty slot (57) opened in the threaded rod (43), a connecting groove (58) opened at the bottom of the empty slot (57), and a limiting piece (59) arranged on the push block (48); The gear (54) is engaged with the two groups of racks (53) at the same time; The connecting rod (55) is rotatably connected with the push block (48); The insertion plate (56) is rotatably connected in the empty slot (57).

7. A crankshaft and crankpin machining tool according to claim 6, wherein: The plug-in plate (56) is V-shaped, the maximum width of the plug-in plate (56) is equal to the width of the connecting groove (58), and the thickness of the plug-in plate (56) is smaller than the thickness of the connecting groove (58).

8. A crankshaft and crankpin machining tool according to claim 7, wherein: The limiting piece (59) comprises a fixed rod (591) fixedly connected to the bottom of the plug-in block (52), a limiting block (592) slidably connected to the bottom of the fixed rod (591), a second elastic piece (593) installed between the limiting block (592) and the fixed rod (591), and a limiting groove (594) formed in the top block (42).

9. A crankshaft and crankpin machining tool according to claim 8, wherein: The water spraying assembly (6) comprises a spray head (61) fixedly connected to the outer side of the push block (48) and a spiral water pipe (62) fixedly connected to the spray head (61); and the end of the spray head (61) is inclined.

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