A piston pin bore machining device

Abstract

The application relates to the technical field of piston processing, and particularly discloses a piston pin hole processing device, which comprises a base, a workbench and a cutter arranged on the base, a storage table arranged on the top of the workbench, a lifting seat arranged on the storage table and capable of lifting on the workbench, an installation box fixedly installed at the bottom of the lifting seat and located directly above the storage table, a plurality of vertical shafts evenly distributed in a circumferential ring shape and rotationally assembled on the storage table, a positioning plate fixedly installed on each vertical shaft, and a rotating disc coaxially rotationally assembled on the storage table and capable of rotating on the storage table along with the lowering of the lifting seat; the piston pin hole processing device is characterized in that, along with the lowering of the lifting seat, the positioning plate is used to first position and clamping-fix the piston at the center on the outside, and then the calibration rod is used to push the piston to rotate and support and position in the inner cavity of the piston; while the piston is positioned, the orientation of the pin hole is automatically calibrated, the pin hole is accurately directed towards the cutter, and the coaxiality of the pin hole and the cutter in the processing is improved.

Description

Technical Field

[0001] This invention relates to the field of piston machining technology, and more specifically to a piston pin hole machining device. Background Technology

[0002] Pistons are key components in mechanical devices such as engines or compressors. They are usually cylindrical parts that reciprocate within a cylinder. In an engine, the piston is propelled by the high-pressure gas generated by burning fuel, converting thermal energy into mechanical energy. In hydraulic or pneumatic systems, pistons are used to transmit pressure and achieve power transmission. They are widely used in automotive engines, compressors, hydraulic cylinders, and other equipment.

[0003] In existing piston pin hole boring processes, two coaxial, opposing cutting tools are typically used to simultaneously approach the relatively flat pin hole wall on the piston, thus boring the two opposing pin holes at the same time. However, most equipment cannot automatically calibrate the pin hole position during piston clamping. Manual clamping is required, and the piston angle needs to be adjusted multiple times to ensure that the flat pin hole wall on the piston faces the direction of the cutting tool, so that the cutting tool can accurately enter the pin hole. This process is not only inefficient and difficult, but also highly dependent on personal experience. The coaxiality between the cutting tool and the pin hole cannot be guaranteed during calibration, and deviations are prone to occur during tool feed, affecting the machining accuracy of the pin hole and leading to reduced piston quality or even scrap. Summary of the Invention

[0004] This invention provides a piston pin hole machining device, which aims to solve the problem in related technologies that the pin hole position cannot be automatically calibrated during piston clamping, requiring manual clamping and multiple adjustments of the piston angle, and the coaxiality between the tool and the pin hole cannot be guaranteed during calibration.

[0005] The piston pin hole processing device of the present invention includes a base, a worktable and a cutting tool are provided on the base, a shelf is provided on the top of the worktable, a lifting seat is provided on the shelf, which can be raised and lowered on the worktable, and a mounting box located directly above the shelf is fixedly installed at the bottom of the lifting seat.

[0006] The platform is equipped with multiple vertical shafts that are evenly distributed in a ring around its circumference. Each vertical shaft is fixedly mounted with a positioning plate. The platform is also equipped with a turntable that rotates coaxially. The turntable can rotate on the platform as the lifting seat descends, pushing the multiple vertical shafts to rotate so that the ends of the multiple positioning plates that are away from the vertical shafts move closer to each other.

[0007] The mounting box contains a square plate that slides vertically with a single degree of freedom. The square plate is horizontally positioned parallel to the central axis of the tool. Inside the square plate, four calibration rods are evenly distributed in a ring and slide along their diagonal direction. Inside the mounting box, a pusher plate is rotatably mounted. The pusher plate can rotate inside the mounting box as the square plate slides, and pushes the four calibration rods to slide synchronously and move away from each other within the square plate.

[0008] Preferably, a frame is fixedly installed on the side of the vertical axis away from the positioning plate, and a push rod extending into the frame is fixedly installed on the turntable.

[0009] Preferably, a sleeve is vertically fixed on the mounting box, a pressure rod is slidably fitted inside the sleeve, and a compression spring is provided between the pressure rod and the sleeve. An arc-shaped wedge is fixedly installed on the side wall of the turntable. The top of the wedge is an inclined surface and located directly below the pressure rod. The pressure rod can abut against the wedge during descent and push the wedge to rotate the turntable on the platform.

[0010] Preferably, the square plate has four annularly distributed sliding grooves along its diagonal direction, and the four calibration rods are slidably assembled inside the four sliding grooves. The push plate has four annularly distributed arc-shaped grooves inside, and the tops of the four calibration rods extend into the four arc-shaped grooves respectively.

[0011] Preferably, a connecting rod is coaxially fixed to the bottom of the push plate, and a protrusion fixed to the square plate is provided on the connecting rod, which can push the connecting rod to rotate as the square plate slides.

[0012] Preferably, the connecting rod has a spiral groove on its side wall, a through hole in the middle of the square plate, the connecting rod extends into the through hole, and the protrusion is fixedly installed on the inner wall of the through hole, with its end away from the square plate extending into the spiral groove.

[0013] Preferably, the top of the base is provided with mutually perpendicular longitudinal slides and transverse slides, and the transverse slides are symmetrically distributed on both sides of the longitudinal slides in two sets.

[0014] Preferably, a slide is fixedly installed at the bottom of the workbench, the slide is slidably mounted on the longitudinal slide, and a column is provided on one side of the workbench. The lifting seat is located inside the column and can be raised and lowered within the column.

[0015] Preferably, a drive box is slidably mounted on the transverse slide, a rotating seat is rotatably mounted on the drive box, and the cutting tool is mounted on the rotating seat.

[0016] Beneficial effects:

[0017] In use, the piston is placed on the platform. As the lifting seat descends, the positioning plate first centers and clamps the piston from the outside. Then, the calibration rod pushes the piston to rotate and supports its positioning within the piston cavity. While positioning the piston, the orientation of the pin hole is automatically calibrated to ensure it is precisely aligned with the tool, improving the coaxiality between the pin hole and the tool during machining. This makes piston positioning and calibration more convenient and faster, eliminating the hassle of repeated adjustments by operators, reducing the difficulty of piston clamping, and improving replacement efficiency. Consequently, while ensuring the machining accuracy of the pin hole, the machining efficiency of the piston is improved. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention.

[0019] Figure 2 This is the present invention. Figure 1 A magnified structural diagram of point A in the middle.

[0020] Figure 3 This is a front view of the present invention.

[0021] Figure 4 This is a side view of the workbench of the present invention.

[0022] Figure 5 This is a cross-sectional view of the sleeve of the present invention.

[0023] Figure 6 This is a cross-sectional view of the mounting box of the present invention.

[0024] Figure 7 This is a schematic diagram of the bottom structure of the mounting box of the present invention.

[0025] Figure 8 This is a top view of the square plate of the present invention.

[0026] Figure 9 This is a perspective view of the push plate of the present invention.

[0027] Figure 10 This is a top view of the turntable of the present invention.

[0028] Figure label:

[0029] 10. Base; 11. Longitudinal slide; 12. Transverse slide; 20. Worktable; 21. Slide; 22. Storage platform; 23. Column; 24. Lifting seat; 25. Mounting box; 30. Machining tool set; 31. Drive box; 32. Rotating seat; 33. Tool; 40. Positioning mechanism; 41. Vertical shaft; 411. Frame; 42. Positioning plate; 43. Turntable; 431. Push rod; 50. Calibration mechanism; 51. Square plate; 511. Slide groove; 512. Through hole; 513. Spring; 52. Calibration rod; 53. Push plate; 531. Arc groove; 60. Transmission mechanism; 61. Connecting rod; 611. Spiral groove; 62. Protrusion; 70. Pushing assembly; 71. Sleeve; 72. Pressure rod; 73. Compression spring; 74. Wedge. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1 to 10 As shown, the piston pin hole machining apparatus of the present invention includes a base 10, a worktable 20, a machining tool set 30, a positioning mechanism 40, a calibration mechanism 50, a transmission mechanism 60, and a pushing assembly 70. The worktable 20 is disposed on the base 10 and can slide on the base 10 to support the piston. The machining tool set 30 is located on the side of the worktable 20 and is used to machine the piston pin hole. The positioning mechanism 40 can center the piston from the outside under the drive of the pushing assembly 70. The calibration mechanism 50 can position the piston from the inside and calibrate the pin hole position under the operation of the transmission mechanism 60.

[0032] refer to Figure 1 and Figure 3 The base 10 has a vertical longitudinal slide 11 and a transverse slide 12 on its top, and the transverse slide 12 has two sets symmetrically distributed on both sides of the longitudinal slide 11.

[0033] refer to Figure 1 , Figure 3 as well as Figure 4 The bottom of the worktable 20 is fixedly installed with a slide 21, which is slidably mounted on the longitudinal slide 11. The slide 21 moves on the longitudinal slide 11, which drives the worktable 20 to move on the base 10. The top of the worktable 20 is provided with a platform 22, and a column 23 is provided on one side of the platform 22. A lifting seat 24 is provided inside the column 23, which can be raised and lowered within the column 23. The bottom of the lifting seat 24 is provided with a mounting box 25 located directly above the platform 22 for mounting the calibration mechanism 50.

[0034] refer to Figure 1 and Figure 3 The machining tool set 30 includes a drive box 31, a rotating seat 32, and a cutting tool 33. There are two drive boxes 31, which are slidably mounted on two transverse slides 12 respectively. By sliding on the transverse slides 12, they can move closer to or further away from the worktable 20. The rotating seat 32 is rotatably mounted on the drive box 31 and can rotate under the drive of the drive box 31. The cutting tool 33 is set on the rotating seat 32 and can rotate under the drive of the rotating seat 32, thereby machining the pin hole of the piston.

[0035] refer to Figure 2 and Figure 10 The positioning mechanism 40 includes a vertical shaft 41, a positioning plate 42, and a turntable 43. The vertical shaft 41 is rotatably mounted on the top of the platform 22, and multiple vertical shafts 41 are evenly distributed in a ring along the circumference of the platform 22. Multiple positioning plates 42 are respectively fixedly mounted on multiple vertical shafts 41. The turntable 43 is coaxially rotatably mounted on the top of the platform 22, and can drive multiple vertical shafts 41 to rotate synchronously during rotation, so that the positioning plates 42 rotate, so that the ends of multiple positioning plates 42 away from the vertical shaft 41 move closer to each other to center the piston, or move away from each other to release the positioning of the piston.

[0036] A frame 411 is fixedly installed on the side of the vertical shaft 41 away from the positioning plate 42. A push rod 431 extending into the frame 411 is fixedly installed on the turntable 43. When the turntable 43 rotates, the push rod 431 pushes the frame 411 to rotate the vertical shaft 41, thereby causing the positioning plate 42 to rotate to gather or disperse.

[0037] refer to Figure 6 , Figure 7 , Figure 8 as well as Figure 9The calibration mechanism 50 includes a square plate 51, calibration rods 52, and a pusher plate 53. The square plate 51 is slidably mounted inside the mounting box 25 with a single degree of freedom in its upper and lower parts, and is horizontally arranged parallel to the central axis of the tool 33. There are four calibration rods 52, which are evenly distributed in a ring around the square plate 51 and can slide along its diagonal direction within the square plate 51. The pusher plate 53 is rotatably mounted inside the mounting box 25 above the square plate 51, and can push the four calibration rods 52 to slide along the diagonal direction of the square plate 51 during rotation, moving them closer to or further away from each other, so that the four calibration rods 52 protruding into the piston cavity can... The piston is rotated on the stage 22 by pushing the pin hole wall. Finally, the four calibration rods 52 are paired up and abutted against the two opposite pin hole walls on the piston. The piston is supported and positioned by the inner cavity. Since the calibration rods 52 move along the diagonal of the square plate 51 and the square plate 51 is parallel to the central axis of the tool 33, the pin hole on the piston can be accurately oriented towards the tool 33 at the same time as the calibration rods 52 complete the piston positioning. This completes the calibration of the pin hole position so that the pin hole and the central axis of the tool 33 are parallel to each other. This allows the tool 33 to accurately enter the pin hole for machining after the worktable 20 moves.

[0038] The square plate 51 has four annularly distributed sliding grooves 511 along its diagonal direction. The four calibration rods 52 are slidably assembled inside the four sliding grooves 511. The push plate 53 has four annularly distributed arc-shaped grooves 531 inside. The tops of the four calibration rods 52 extend into the four arc-shaped grooves 531 respectively. When the push plate 53 rotates, the arc-shaped grooves 531 push the calibration rods 52 to slide in the sliding grooves 511, thereby realizing that the four calibration rods 52 move away from or closer to each other, so that the calibration rods 52 are dispersed or gathered, so as to facilitate the positioning of the piston and the calibration of the pin hole position.

[0039] refer to Figure 6 and Figure 9 The transmission mechanism 60 includes a connecting rod 61 and a protrusion 62. The connecting rod 61 is coaxially fixed to the bottom of the push plate 53. The protrusion 62 is disposed on the connecting rod 61 and fixed to the square plate 51. The protrusion 62 can push the connecting rod 61 to rotate during the lifting and lowering of the square plate 51, thereby causing the push plate 53 to rotate within the mounting box 25.

[0040] The connecting rod 61 has a spiral groove 611 on its side wall, and a through hole 512 is provided in the middle of the square plate 51. Four sliding grooves 511 are evenly distributed around the through hole 512. The connecting rod 61 extends into the interior of the through hole 512. The protrusion 62 is fixedly installed on the inner wall of the through hole 512, and its end away from the square plate 51 extends into the spiral groove 611. When the square plate 51 is raised and lowered, the protrusion 62 slides along the spiral groove 611, which in turn pushes the connecting rod 61 to rotate, thereby driving the push plate 53 to rotate. A spring 513 is fixedly installed between the mounting boxes 25 of the square plate 51. It can store force when the square plate 51 is raised and apply a downward pushing force to the square plate 51 after the square plate 51 loses external force.

[0041] refer to Figure 4 and Figure 5 The pushing assembly 70 includes a sleeve 71, a pressure rod 72, a pressure spring 73, and a wedge 74. The sleeve 71 is vertically fixed on the mounting box 25. The pressure rod 72 is vertically slidably mounted inside the pressure rod 72. The pressure spring 73 is disposed between the sleeve 71 and the pressure rod 72. The wedge 74 is arc-shaped and fixedly mounted on the side wall of the turntable 43. The top of the wedge 74 is an inclined surface and located directly below the pressure rod 72. The pressure rod 72 can abut against the wedge 74 during descent and push the wedge 74 to rotate the turntable 43 on the platform 22, thereby centering the piston. A torsion spring is provided between the turntable 43 and the platform 22. After the pressure rod 72 lifts and resets the wedge 74, the torsion spring drives the turntable 43 to rotate and reset.

[0042] Working principle: The piston is placed on the platform 22 and lowered by the lifting seat 24, causing the pressure rod 72 to squeeze the wedge block 74 during descent, forcing the turntable 43 to rotate and compressing the torsion spring. The push rod 431 pushes the frame 411 to rotate the vertical shaft 41. The ends of multiple positioning plates 42 move closer to each other, pushing the piston to move on the platform 22. The piston is centered by the outside of the piston, making the piston coaxial with the platform 22.

[0043] As the piston completes its center positioning, the lifting seat 24 continues to descend, the compression spring 73 inside the sleeve 71 is compressed, the mounting box 25 gradually approaches the piston, the calibration rod 52 enters the piston cavity, the square plate 51 adheres to the top of the piston, and then the square plate 51 is blocked by the top of the piston and slides and rises relative to the mounting box 25. The protrusion 62 moves along the spiral groove 611 to push the connecting rod 61 to rotate, which drives the push plate 53 to rotate and push the calibration rod 52 to slide in the slide groove 511, so that the four calibration rods 52 are dispersed and pushed to rotate the piston. Finally, the four calibration rods 52 are paired up and respectively attached to the walls of two opposite pin holes on the piston. The piston is supported and positioned by the inner cavity, and the pin holes are oriented towards the tool 33, thus completing the calibration of the pin hole position.

[0044] By sliding the worktable 20 on the longitudinal slide 11, the piston is moved to the side of the tool 33, and then the drive box 31 slides on the transverse slide 12 to approach the piston, and the tool 33 processes the pin hole.

[0045] In this invention, after the piston is placed on the platform 22, as the lifting seat 24 descends, the positioning plate 42 first centers and clamps the piston on the outside. Then, the calibration rod 52 pushes the piston to rotate and supports its positioning within the piston cavity. While positioning the piston, the orientation of the pin hole is automatically calibrated so that it is precisely oriented towards the tool 33, improving the coaxiality between the pin hole and the tool 33 during machining. This makes the positioning and calibration of the piston more convenient and faster, saving the trouble of repeated adjustments by the staff, reducing the difficulty of piston clamping, and improving replacement efficiency. In turn, while ensuring the machining accuracy of the pin hole, the machining efficiency of the piston is improved.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A piston pin hole machining device, comprising a base (10), a worktable (20) and a cutting tool (33) disposed on the base (10), characterized in that, The top of the workbench (20) is provided with a shelf (22), and a lifting seat (24) is provided on the shelf (22) so that it can be raised and lowered on the workbench (20). The bottom of the lifting seat (24) is fixedly installed with a mounting box (25) located directly above the shelf (22). The platform (22) is rotatably equipped with multiple vertical shafts (41) evenly distributed in a ring around its circumference. Each vertical shaft (41) is fixedly installed with a positioning plate (42). The platform (22) is also coaxially rotatably equipped with a turntable (43), which can rotate on the platform (22) as the lifting seat (24) descends, pushing the multiple vertical shafts (41) to rotate, so that the ends of the multiple positioning plates (42) away from the vertical shafts (41) move closer to each other. Inside the mounting box (25), a square plate (51) is slidably mounted with a single degree of freedom at the top and bottom. The square plate (51) is horizontally set parallel to the central axis of the tool (33). Inside the square plate (51), four calibration rods (52) are evenly distributed in a ring along its diagonal direction. Inside the mounting box (25), a pusher plate (53) is rotatably mounted. The pusher plate (53) can rotate inside the mounting box (25) as the square plate (51) slides, and pushes the four calibration rods (52) to slide synchronously and move away from each other inside the square plate (51). The square plate (51) has four annularly distributed sliding grooves (511) along its diagonal direction. The four calibration rods (52) are slidably assembled inside the four sliding grooves (511). The push plate (53) has four annularly distributed arc grooves (531) inside. The tops of the four calibration rods (52) extend into the four arc grooves (531). A sleeve (71) is vertically fixed on the mounting box (25). A pressure rod (72) is slidably fitted inside the sleeve (71), and a compression spring (73) is provided between the pressure rod (72) and the sleeve (71). An arc-shaped wedge (74) is fixedly installed on the side wall of the turntable (43). The top of the wedge (74) is an inclined surface and is located directly below the pressure rod (72). The pressure rod (72) can abut against the wedge (74) during descent and push the wedge (74) to rotate the turntable (43) on the platform (22). In this process, after the piston is placed on the platform (22), as the lifting seat (24) descends, the positioning plate (42) first positions and clamps the piston on the outside, and then the calibration rod (52) pushes it to rotate and supports its positioning in the piston cavity. While positioning the piston, the orientation of the pin hole is automatically calibrated.

2. The piston pin hole machining device according to claim 1, characterized in that, A frame (411) is fixedly installed on the side of the vertical axis (41) away from the positioning plate (42), and a push rod (431) extending into the frame (411) is fixedly installed on the turntable (43).

3. The piston pin hole machining device according to claim 2, characterized in that, The bottom of the push plate (53) is coaxially fixed with a connecting rod (61), and the connecting rod (61) is provided with a protrusion (62) fixed on the square plate (51), which can push the connecting rod (61) to rotate during the sliding of the square plate (51).

4. The piston pin hole machining device according to claim 3, characterized in that, The connecting rod (61) has a spiral groove (611) on its side wall, and a through hole (512) is provided in the middle of the square plate (51). The connecting rod (61) extends into the inside of the through hole (512), and the protrusion (62) is fixedly installed on the inner wall of the through hole (512), with one end away from the square plate (51) extending into the spiral groove (611).

5. The piston pin hole machining device according to claim 1, characterized in that, The base (10) is provided with a longitudinal slide (11) and a transverse slide (12) that are perpendicular to each other, and the transverse slide (12) has two sets symmetrically distributed on both sides of the longitudinal slide (11).

6. The piston pin hole machining device according to claim 5, characterized in that, The bottom of the workbench (20) is fixedly installed with a slide (21), which is slidably mounted on the longitudinal slide (11). The workbench (20) is provided with a column (23) located on one side of the shelf (22), and a lifting seat (24) is located inside the column (23) and can be raised and lowered inside the column (23).

7. The piston pin hole machining apparatus according to claim 6, characterized in that, A drive box (31) is slidably mounted on the transverse slide (12), and a rotating seat (32) is rotatably mounted on the drive box (31). The cutting tool (33) is set on the rotating seat (32).

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