Casting mold eccentric hole drilling device

Abstract

The invention relates to the technical field of part machining, in particular to a casting mold eccentric hole drilling device which comprises a base, a drilling machine and a base are installed on the base, a rotating mechanism used for rotating the base is arranged in the base, a sliding groove is formed in the base, and a fixing base is installed in the sliding groove in a sliding mode. A sliding mechanism used for adjusting the position of the fixed seat is arranged in the base, an annular step is arranged outside the fixed seat, a plurality of movable plates are installed on the annular step in a sliding mode, a driving mechanism used for driving the movable plates is arranged in the fixed seat, and transverse plates are fixed to the movable plates; a pressure sensor is fixedly embedded in the upper end face of the transverse plate, and an arc-shaped clamping plate is fixed to the upper end of the transverse plate. Compared with the prior art, casting molds of different sizes can be fixed and drilled, the application range is wide, pressure borne by the supporting legs is shared, and the service life of the supporting legs is prolonged.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, specifically to a drilling device for eccentric holes in casting molds. Background Technology

[0002] A casting mold is a tool used to create a part's structural shape in advance using other easily moldable materials. The mold is then placed in a sand mold, creating a cavity in the sand mold that matches the dimensions of the part. A fluid liquid is then poured into this cavity, and after the liquid cools and solidifies, a part with the exact same shape and structure as the mold is formed. Casting molds are an important part of the casting process.

[0003] Current drilling equipment typically uses a fixed fixture to fix the mold when drilling, and then the drilling machine is adjusted to drill the hole. However, when drilling eccentric holes, the force on different parts of the mold is uneven, and the high-speed rotating drill bit will cause periodic vibration, which will aggravate the asymmetrical force phenomenon. In particular, for molds with thin walls or large-area cantilever structures, the fixed foot closer to the hole will become the main damping fulcrum of the vibration, resulting in large differences in the force on the various support feet of the fixed fixture, accelerating the wear of the current support feet, and reducing the service life of the fixed fixture.

[0004] Therefore, based on the above problems, we have invented a drilling device for eccentric holes in casting molds. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a drilling device for eccentric holes in casting molds, thereby solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drilling device for eccentric holes in casting molds, comprising a base, on which a drilling machine and a base are mounted for use; a rotating mechanism for rotating the base is provided inside the base; a sliding groove is provided on the base, and a fixed seat is slidably installed in the sliding groove; a sliding mechanism for adjusting the position of the fixed seat is provided inside the base; an annular step is provided outside the fixed seat, and multiple movable plates are slidably installed on the annular step; a driving mechanism for driving the multiple movable plates is provided inside the fixed seat; a horizontal plate is fixed on the movable plate, and a pressure sensor is fixedly embedded on the upper surface of the horizontal plate; an arc-shaped clamping plate is fixed on the upper surface of the horizontal plate; and a compensation mechanism for supporting and compensating the casting mold is provided inside the movable plate.

[0007] Furthermore, the rotating mechanism includes an annular groove disposed on the upper end of the base, a rotating ring rotatably mounted in the annular groove, the rotating ring being fixedly mounted to the base, a rotating motor being installed in the annular groove, a rotating gear being coaxially mounted on the drive shaft of the rotating motor, and an annular toothed groove being provided on the outside of the rotating ring to mesh with the rotating gear.

[0008] Furthermore, the sliding mechanism includes a cavity disposed within the base, two rotating shafts rotatably mounted within the cavity, the two rotating shafts being connected by a transmission mechanism, a sliding motor installed within the cavity, the drive shaft of the sliding motor being coaxially mounted with the rotating shafts, a sliding groove being provided on the inner wall of the sliding groove, the upper ends of both rotating shafts rotatably penetrating the base and extending into the sliding groove respectively, a sliding gear being coaxially mounted on the outside of the rotating shafts, and a strip-shaped toothed groove being provided on the outer wall of the fixed base to mesh with the sliding gear.

[0009] Furthermore, the transmission mechanism includes an intermediate shaft rotatably mounted to the inner wall of the cavity. A first transmission gear and a second pulley are coaxially mounted on the outside of the intermediate shaft. The first pulley and the second transmission gear are coaxially mounted on the two rotating shafts, respectively. The first pulley and the second pulley are connected by a synchronous belt drive. The first transmission gear and the second transmission gear are meshed together.

[0010] Furthermore, the driving mechanism includes a transmission cavity disposed within a fixed base. The transmission cavity is provided with a gear disc and multiple rotating sleeves. Each of the multiple rotating sleeves is coaxially mounted with a third transmission gear, which meshes with the gear disc. A rotating screw is threaded into each rotating sleeve. The end of the rotating screw away from the rotating sleeve is fixed to multiple movable plates. The rotating sleeve rotatably passes through the fixed base, and the rotating screw slidably passes through the movable plates. The fixed base is provided with a mounting cavity, in which a drive motor is mounted. The drive shaft of the drive motor rotatably passes through the fixed base and is coaxially mounted with the gear disc.

[0011] Furthermore, the compensation mechanism includes a through hole penetrating the moving plate and the horizontal plate. A bidirectional screw is provided in the through hole, and a fixed plate is rotatably sleeved on the outside of the bidirectional screw. The fixed plate is fixed to the inner wall of the through hole. Support plates are threaded on both ends of the bidirectional screw, and both support plates are slidably connected to the through hole. An adjusting motor is installed outside the moving plate. The drive shaft of the adjusting motor rotates through the moving plate and extends into the bidirectional screw. The drive shaft of the adjusting motor is connected to the bidirectional screw through a bevel gear set. The adjusting motor is electrically connected to the pressure sensor.

[0012] Furthermore, the bevel gear set includes a first bevel gear and a second bevel gear that mesh with each other. The first bevel gear is coaxially mounted with the drive shaft of the regulating motor, and the second bevel gear is coaxially mounted with the bidirectional screw.

[0013] Furthermore, a cleaning disc is rotatably mounted on the upper end of the fixed base, a telescopic rod is fixed outside the cleaning disc, and an inclined plate is fixedly mounted on the end of the telescopic rod away from the cleaning disc. The inclined plate abuts against the upper surface of the fixed base. A cleaning motor is installed at the top of the transmission cavity, and the drive shaft of the cleaning motor rotates through the fixed base and is coaxially mounted with the cleaning disc.

[0014] Furthermore, the arc-shaped clamp is arranged in an arc shape towards the center of the fixed seat.

[0015] Furthermore, both of the fixing plates are provided with threaded holes that match the bidirectional screw, and the threads in the two threaded holes are in opposite directions.

[0016] Compared with the prior art, the present invention provides a drilling device for eccentric holes in casting molds, which has the following advantages: 1. By setting up a drive mechanism, the casting mold can be fixed in multiple directions through multi-directional arc-shaped clamps, which can fix molds of different sizes and has a wide range of applications.

[0017] 2. By setting up a rotating mechanism and a sliding mechanism, the position of the casting mold can be adjusted in the circumferential and radial directions to allow drilling at any position of the casting mold, making it applicable to a wide range of applications.

[0018] 3. By setting up a compensation mechanism, when drilling eccentric holes, the pressure is distributed to the support foot with greater pressure according to the pressure difference on the support foot, so that the pressure on each support foot is similar. This reduces the wear on the support foot when drilling eccentric holes and extends the service life of the support foot.

[0019] This application can fix and drill holes in casting molds of different sizes, has a wide range of applications, and distributes the pressure on the support feet, thus extending the service life of the support feet. Attached Figure Description

[0020] Figure 1 A front structural schematic diagram of an eccentric hole drilling device for a casting mold; Figure 2 A perspective view of the rotating mechanism in an eccentric hole drilling device for a casting mold; Figure 3 A partial top view of an eccentric hole drilling device for a casting mold; Figure 4 A side perspective view of an eccentric hole drilling device for a casting mold; Figure 5 A perspective view of the compensation mechanism in an eccentric hole drilling device for a casting mold; Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Base; 2. Drilling rig; 3. Base; 4. Rotary ring; 5. Annular groove; 6. Rotating motor; 7. Rotating gear; 8. Fixed seat; 9. Cavity; 10. Sliding groove; 11. Rotating shaft; 12. Sliding motor; 13. Transmission mechanism; 14. First pulley; 15. Sliding gear; 16. Moving plate; 17. Pressure sensor; 18. Horizontal plate; 19. Arc-shaped clamping plate; 20. Cleaning motor; 21. Transmission cavity; 22. Gear disc; 23. Transmission gear 24. Wheel; 25. Mounting cavity; 26. Drive motor; 27. Rotating sleeve; 28. Rotating screw; 29. ​​Cleaning disc; 30. Telescopic rod; 31. Inclined plate; 32. Through hole; 33. Double-acting screw; 34. Support plate; 35. Fixing plate; 36. Adjusting motor; 37. Bevel gear set; 38. First bevel gear; 39. Second bevel gear; 40. Slide groove; 41. Intermediate shaft; 42. First transmission gear; 43. Second pulley; 44. Second transmission gear. Detailed Implementation

[0022] 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.

[0023] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a drilling device for eccentric holes in casting molds.

[0024] like Figures 1-6 As shown, a drilling device for eccentric holes in a casting mold includes a base 1, on which a drilling machine 2 and a base 3 are mounted. The base 1 has a rotating mechanism for rotating the base 3. The base 3 has a sliding groove 39, within which a fixed seat 8 is slidably mounted. The base 3 also has a sliding mechanism for adjusting the position of the fixed seat 8. An annular step is provided outside the fixed seat 8, on which multiple movable plates 16 are slidably mounted. The fixed seat 8 has a driving mechanism for driving the multiple movable plates 16. A horizontal plate 18 is fixed on each movable plate 16, and a pressure sensor 17 is embedded in the upper surface of the horizontal plate 18. An arc-shaped clamping plate 19 is fixed to the upper end of the horizontal plate 18. Notably, the opposite sides of the multiple arc-shaped clamping plates 19 are all arc-shaped. The movable plate 16 has a compensation mechanism for supporting and compensating the casting mold.

[0025] In order to clean metal debris from the upper surface of the fixed base 8, a cleaning disc 28 is rotatably installed on the upper end of the fixed base 8. A telescopic rod 29 is fixed to the outside of the cleaning disc 28. An inclined plate 30 is fixedly installed at the end of the telescopic rod 29 away from the cleaning disc 28. It should be noted that the inclined plate 30 forms an obtuse angle with the radial direction of the fixed base 8, and the inclined plate 30 abuts against the upper end surface of the fixed base 8. A cleaning motor 20 is installed at the top of the transmission cavity 21. The drive shaft of the cleaning motor 20 rotates through the fixed base 8 and is coaxially installed with the cleaning disc 28.

[0026] Through the above technical features: the cleaning motor 20 drives the cleaning disc 28 to rotate, and the cleaning disc 28 drives the inclined plate 30 to rotate through the telescopic rod 29, so that the inclined plate 30 can clean the metal shavings on the surface of the fixed seat 8.

[0027] To adjust the circumferential position of the mold, a rotating mechanism is provided. The rotating mechanism includes an annular groove 5 located on the upper end of the base 1. A rotating ring 4 is rotatably installed in the annular groove 5. It should be noted that an electric limit switch is installed on the rotating ring 4, and the electric limit switch is electrically connected to the rotating motor 6 to limit the rotating ring 4. When the rotating motor 6 stops, it ensures that the rotating ring 4 is locked and will not rotate. The rotating ring 4 is fixedly installed on the base 3. The rotating motor 6 is installed in the annular groove 5. A rotating gear 7 is coaxially installed on the drive shaft of the rotating motor 6. The rotating ring 4 has an annular toothed groove that meshes with the rotating gear 7.

[0028] To adjust the radial position of the mold, a sliding mechanism is provided. This mechanism includes a cavity 9 within the base 3, and two rotating shafts 11 are rotatably mounted within the cavity 9. It should be noted that each rotating shaft 11 is equipped with an electric limit switch, which is electrically connected to a sliding motor 12 to limit the rotation of the shaft 11. When the sliding motor 12 stops, the shaft 11 is locked and will not rotate. The two rotating shafts 11 are connected by a transmission mechanism 13. Notably, the transmission mechanism 13 includes an intermediate shaft 40 rotatably mounted to the inner wall of the cavity 9. A first transmission gear 41 and a second pulley 42 are coaxially mounted on the outside of the intermediate shaft 40. The first pulleys are coaxially mounted on each of the two rotating shafts 11. 14 and 43 are connected by a synchronous belt drive between the first pulley 14 and the second pulley 42. The first transmission gear 41 and the second transmission gear 43 are meshed. It should be noted that a limit frame is provided outside the first pulley 14 and the second pulley 42 to limit the synchronous belt and prevent it from disengaging during operation. A sliding motor 12 is installed in the cavity 9. The drive shaft of the sliding motor 12 is coaxially installed with the rotating shaft 11. A sliding groove 10 is provided on the inner wall of the sliding groove 39. The upper ends of the two rotating shafts 11 rotatably pass through the base 3 and extend into the sliding groove 10 respectively. A sliding gear 15 is coaxially installed outside the rotating shaft 11. A strip-shaped toothed groove that meshes with the sliding gear 15 is provided on the outer wall of the fixed base 8.

[0029] Through the above technical features: The rotating gear 7 is driven to rotate by the drive shaft of the rotating motor 6, which in turn drives the rotating ring 4 to rotate, which in turn drives the base 3 to rotate, and the base 3 drives the mold on it to rotate, thus allowing the mold to be adjusted circumferentially. The drive shaft of the sliding motor 12 drives two rotating shafts 11 to rotate relative to each other. The two rotating shafts 11 drive two sliding gears 15 to rotate relative to each other. The two sliding gears 15 drive the fixed seat 8 to move until the appropriate position is reached; thus, the mold can be radially adjusted. By adjusting in the two directions mentioned above, any position on the mold surface can be adjusted to a suitable position, making it convenient to drill holes in any position of the mold, and it has a wide range of applications.

[0030] To fix different molds, a drive mechanism is provided. The drive mechanism includes a transmission cavity 21 set in the fixed base 8. The transmission cavity 21 is provided with a gear disk 22 and multiple rotating sleeves 26. Each of the multiple rotating sleeves 26 is coaxially mounted with a third transmission gear 23. The multiple third transmission gears 23 are meshed with the gear disk 22. A rotating screw 27 is threadedly connected to the rotating sleeve 26. The end of the rotating screw 27 away from the rotating sleeve 26 is fixed to multiple moving plates 16. The rotating sleeve 26 rotates through the fixed base 8, and the rotating screw 27 slides through the moving plates 16. The fixed base 8 is provided with an installation cavity 24. A drive motor 25 is installed in the installation cavity 24. The drive shaft of the drive motor 25 rotates through the fixed base 8 and is coaxially mounted with the gear disk 22.

[0031] Through the above technical features: the drive shaft of the drive motor 25 drives the gear disk 22 to rotate, the gear disk 22 drives multiple rotating sleeves 26 to rotate through multiple third transmission gears 23, the multiple rotating sleeves 26 drive multiple rotating screws 27 to move relative to each other, the rotating screws 27 drive the moving plate 16 to move, and the moving plate 16 drives the arc-shaped clamping plate 19 to move through the horizontal plate 18 until the mold is fixed, thus completing the fixing of molds of different sizes, with a wide range of applications.

[0032] To compensate for the uneven force distribution on one support leg during eccentric hole drilling, a compensation mechanism is provided. This mechanism includes a through hole 31 penetrating the moving plate 16 and the horizontal plate 18. A bidirectional screw 32 is installed within the through hole 31, and a fixing plate 34 is rotatably sleeved around the bidirectional screw 32. It should be noted that both fixing plates 34 have threaded holes matching the bidirectional screw 32, with opposite thread directions. The fixing plates 34 are fixed to the inner wall of the through hole 31. Support plates 33 are threaded onto both ends of the bidirectional screw 32. It should be noted that the distance between the upper support plate 33 and the upper surface of the horizontal plate 18 is different from that between the lower support plate 33 and the upper surface of the horizontal plate 18. The support plate 33 is equidistant from the lower end face of the movable plate 16. Both support plates 33 are slidably connected to the through hole 31. An adjustment motor 35 is mounted on the outside of the movable plate 16. The drive shaft of the adjustment motor 35 rotates through the movable plate 16 and extends into the bidirectional screw 32. The drive shaft of the adjustment motor 35 and the bidirectional screw 32 are connected by a bevel gear set 36. It is worth mentioning that the bevel gear set 36 includes a first bevel gear 37 and a second bevel gear 38 that mesh with each other. The first bevel gear 37 is coaxially mounted with the drive shaft of the adjustment motor 35, and the second bevel gear 38 is coaxially mounted with the bidirectional screw 32. The adjustment motor 35 is electrically connected to the pressure sensor 17.

[0033] Through the above technical features: during drilling, when the drill bit contacts and squeezes the mold, the pressure sensor 17 closer to the drill hole experiences a significantly different pressure compared to other pressure sensors 17. At this time, the adjusting motor 35 on the moving plate 16 is driven, and the drive shaft of the adjusting motor 35 drives the bidirectional screw 32 to rotate. The bidirectional screw 32 drives the two support plates 33 to move relative to each other until the two support plates 33 respectively come into contact with and press against the fixed seat 8 and the mold. This allows part of the pressure on the mold at this location to be shared by the two support plates 33, reducing the pressure on the horizontal plate 18. This makes the pressure on the support foot at the current position similar to the pressure at other positions, reducing wear on the support foot and extending its service life.

[0034] Working principle: 1) Fixing the mold: The drive shaft of the drive motor 25 drives the gear plate 22 to rotate. The gear plate 22 drives multiple rotating sleeves 26 to rotate through multiple third transmission gears 23. The multiple rotating sleeves 26 drive multiple rotating screws 27 to move relative to each other. The rotating screws 27 drive the moving plate 16 to move. The moving plate 16 drives the arc-shaped clamping plate 19 to move through the horizontal plate 18 until the mold is fixed. 2) Adjusting the mold position: The drive shaft of the rotating motor 6 drives the rotating gear 7 to rotate, the rotating gear 7 drives the rotating ring 4 to rotate, the rotating ring 4 drives the base 3 to rotate, and the base 3 drives the mold on it to rotate, thus adjusting the mold circumferentially; The drive shaft of the sliding motor 12 drives the two rotating shafts 11 to rotate relative to each other, the two rotating shafts 11 drive the two sliding gears 15 to rotate relative to each other, and the two sliding gears 15 drive the fixed seat 8 to move until the appropriate position is reached, thus adjusting the mold radially.

[0035] 3) Compensation for pressure on the support foot: During drilling, when the drill bit contacts and presses against the mold, the pressure sensor 17 closer to the drill hole experiences a significantly different pressure compared to other pressure sensors 17. At this time, the adjusting motor 35 on the moving plate 16 is driven, and the drive shaft of the adjusting motor 35 drives the bidirectional screw 32 to rotate. The bidirectional screw 32 drives the two support plates 33 to move relative to each other until the two support plates 33 come into contact with and press against the fixed seat 8 and the mold respectively. This allows part of the pressure on the mold at this location to be shared by the two support plates 33, reducing the pressure on the horizontal plate 18. This makes the pressure on the support foot at the current position similar to the pressure at other locations, reducing wear on the support foot and extending its service life.

[0036] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0037] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this invention.

Claims

1. A drilling device for eccentric holes in casting molds, characterized in that: The system includes a base (1), on which a drilling rig (2) and a base (3) are mounted. The base (1) has a rotating mechanism for rotating the base (3). The base (3) has a sliding groove (39). A fixed seat (8) is slidably installed in the sliding groove (39). The base (3) has a sliding mechanism for adjusting the position of the fixed seat (8). The fixed seat (8) has an annular step on its outside. Multiple movable plates (16) are slidably installed on the annular step. The fixed seat (8) has a driving mechanism for driving the multiple movable plates (16). A horizontal plate (18) is fixed on the movable plate (16). A pressure sensor (17) is fixedly embedded on the upper end face of the horizontal plate (18). An arc-shaped clamping plate (19) is fixed on the upper end of the horizontal plate (18). A compensation mechanism for supporting and compensating the casting mold is provided in the movable plate (16).

2. The eccentric hole drilling device for casting molds according to claim 1, characterized in that: The rotating mechanism includes an annular groove (5) set on the upper end of the base (1), a rotating ring (4) is rotatably installed in the annular groove (5), the rotating ring (4) is fixedly installed with the base (3), a rotating motor (6) is installed in the annular groove (5), a rotating gear (7) is coaxially installed on the drive shaft of the rotating motor (6), and an annular tooth groove that meshes with the rotating gear (7) is provided on the outside of the rotating ring (4).

3. The eccentric hole drilling device for casting molds according to claim 1, characterized in that: The sliding mechanism includes a cavity (9) set in the base (3), two rotating shafts (11) are rotatably installed in the cavity (9), and the two rotating shafts (11) are connected by a transmission mechanism (13). A sliding motor (12) is installed in the cavity (9), and the drive shaft of the sliding motor (12) is coaxially installed with the rotating shaft (11). A sliding groove (10) is provided on the inner wall of the sliding groove (39). The upper ends of the two rotating shafts (11) rotatably pass through the base (3) and extend into the sliding groove (10) respectively. A sliding gear (15) is coaxially installed on the outside of the rotating shaft (11). A strip-shaped toothed groove that meshes with the sliding gear (15) is provided on the outer wall of the fixed seat (8).

4. The eccentric hole drilling device for casting molds according to claim 3, characterized in that: The transmission mechanism (13) includes an intermediate shaft (40) rotatably mounted to the inner wall of the cavity (9). A first transmission gear (41) and a second pulley (42) are coaxially mounted on the outside of the intermediate shaft (40). A first pulley (14) and a second transmission gear (43) are coaxially mounted on the two rotating shafts (11). The first pulley (14) and the second pulley (42) are connected by a synchronous belt drive. The first transmission gear (41) and the second transmission gear (43) are meshed together.

5. The eccentric hole drilling device for casting molds according to claim 1, characterized in that: The driving mechanism includes a transmission cavity (21) set in a fixed base (8). The transmission cavity (21) is provided with a gear disc (22) and multiple rotating sleeves (26). A third transmission gear (23) is coaxially mounted on each of the multiple rotating sleeves (26). The multiple third transmission gears (23) are meshed with the gear disc (22). A rotating screw (27) is threadedly connected to the rotating sleeve (26). The end of the rotating screw (27) away from the rotating sleeve (26) is fixed to multiple moving plates (16). The rotating sleeve (26) is rotatably connected through the fixed base (8). The rotating screw (27) is slidably connected through the moving plate (16). The fixed base (8) is provided with an installation cavity (24). A drive motor (25) is installed in the installation cavity (24). The drive shaft of the drive motor (25) rotatably passes through the fixed base (8) and is coaxially mounted with the gear disc (22).

6. The eccentric hole drilling device for casting molds according to claim 1, characterized in that: The compensation mechanism includes a through hole (31) that passes through the moving plate (16) and the horizontal plate (18). A bidirectional screw (32) is provided in the through hole (31). A fixing plate (34) is rotatably sleeved on the outside of the bidirectional screw (32). The fixing plate (34) is fixed to the inner wall of the through hole (31). Both ends of the bidirectional screw (32) are threaded with support plates (33). Both support plates (33) are slidably connected to the through hole (31). An adjustment motor (35) is installed on the outside of the moving plate (16). The drive shaft of the adjustment motor (35) rotates through the moving plate (16) and extends into the bidirectional screw (32). The drive shaft of the adjustment motor (35) is connected to the bidirectional screw (32) through a bevel gear set (36). The adjustment motor (35) is electrically connected to the pressure sensor (17).

7. The eccentric hole drilling device for casting molds according to claim 6, characterized in that: The bevel gear set (36) includes a first bevel gear (37) and a second bevel gear (38) that mesh with each other. The first bevel gear (37) is coaxially mounted with the drive shaft of the regulating motor (35), and the second bevel gear (38) is coaxially mounted with the bidirectional screw (32).

8. The eccentric hole drilling device for casting molds according to claim 5, characterized in that: A cleaning disc (28) is rotatably mounted on the upper end of the fixed base (8). A telescopic rod (29) is fixed outside the cleaning disc (28). An inclined plate (30) is fixedly mounted on the end of the telescopic rod (29) away from the cleaning disc (28). The inclined plate (30) abuts against the upper surface of the fixed base (8). A cleaning motor (20) is installed at the top inside the transmission cavity (21). The drive shaft of the cleaning motor (20) rotates through the fixed base (8) and is coaxially mounted with the cleaning disc (28).

9. The eccentric hole drilling device for casting molds according to claim 3, characterized in that: The arc-shaped clamp (19) is arranged in an arc shape toward the center of the fixed seat (8).

10. The eccentric hole drilling device for casting molds according to claim 6, characterized in that: Both of the fixing plates (34) are provided with threaded holes that match the bidirectional screw (32), and the threads in the two threaded holes are in opposite directions.

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