Crankshaft positioning and drilling device

Abstract

The invention belongs to the technical field of crankshaft machining, and particularly relates to a crankshaft positioning and drilling device which comprises a machining table, a supporting column is fixed to one end of the machining table, a drilling machine is installed at the top end of the supporting column, and a displacement assembly used for adjusting the position of a crankshaft is arranged at the top end of the machining table. The displacement assembly comprises an upper moving plate arranged above the machining table, and a lower moving plate is arranged below the upper moving plate. The guide groove is formed in the bottom end of the upper moving plate, and the positioning block is used for limiting, so that the upper moving plate can move according to the route of the guide groove when driving the crankshaft to move, the upper moving plate can drive the crankshaft to automatically move the connecting rod journal to the position of a drill bit, and positioning and drilling of the connecting rod journal of the crankshaft are facilitated; and the crankshaft can be driven to linearly move through the movement of the lower moving plate, so that the main journal of the crankshaft can be conveniently drilled, the crankshaft can be conveniently drilled, and the time consumed by manually adjusting the position of the crankshaft is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of crankshaft processing, in particular to a crankshaft positioning drilling device. Background Art

[0002] The crankshaft is an important and indispensable part inside a car engine. It is used to drive the pistons and connecting rods in the engine to move, thereby realizing the operation of the engine. During use, there will be more friction between the crankshaft and other parts, so it is necessary to drill holes in the crankshaft. Drilling allows lubricating oil to seep out through the small holes for lubrication, which can reduce the wear of the crankshaft.

[0003] A patent with existing authorization announcement number CN213997851U discloses a crankshaft drilling device, which improves the drilling efficiency by setting two drilling mechanisms to drill holes at both ends of the crankshaft at the same time, and facilitates the clamping of the crankshaft by setting a limit assembly to improve the processing efficiency.

[0004] The above-mentioned technical solution can only drill holes at both ends of the crankshaft when used. The connecting rod journal position of the crankshaft also needs to be drilled. The connecting rod journals are usually in different positions. When drilling them, the clamping position needs to be adjusted multiple times, resulting in low processing efficiency. In addition, the side of the main journal also needs to be drilled, and the drilling needs to be adjusted to the corresponding position, which is a cumbersome operation.

[0005] To this end, the present invention provides a crankshaft positioning drilling device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a crankshaft positioning and drilling device described in the present invention includes a processing table, a support column is fixed at one end of the processing table, a drilling machine is installed at the top of the support column, and a displacement component for adjusting the crankshaft position is arranged at the top of the processing table; the displacement component includes an upper movable plate arranged above the processing table, and a lower movable plate is arranged below the upper movable plate; a clamping component for fixing the crankshaft is arranged above the upper movable plate.

[0008] Preferably, the clamping assembly includes a fixed seat fixed to the top of the upper movable plate, the fixed seat is internally rotatably connected with two groups of symmetrically arranged clamping plates, the bottom ends of the clamping plates are fixed with a flip axis, a lifting plate is arranged between the flip axes, a plurality of racks are fixed at equal intervals on one side of the flip axis close to the lifting plate, a plurality of racks are also fixed at equal intervals on both sides of the lifting plate close to the flip axis, and the lifting plates are meshed and connected via the rack flip axis.

[0009] Preferably, a sliding column is fixed to the bottom end of the lifting plate, a fixed plate is fixed to the bottom end of the sliding column, a spring is sleeved on the outside of the sliding column, the bottom end of the spring is fixedly connected to the fixed plate, a fixing frame is fixed to the top end of the spring, the bottom end of the fixing frame is fixedly connected to the top end of the upper movable plate, and the sliding column runs through the inside of the fixing frame.

[0010] Preferably, the splints are provided with four groups, each group of splints is arranged at a position matching the crankshaft connecting rod journal, a lifting frame is provided above the upper movable plate, electric telescopic rods are fixed at both ends of the bottom end of the lifting frame, the bottom end of the electric telescopic rod is fixedly connected to the top end of the upper movable plate, a guide pulley is provided on the side of the top end of the upper movable plate away from the splint, both sides of the guide pulley are rotatably connected with a support frame, the bottom end of the support frame is fixedly connected to the upper movable plate, two guide pulleys are provided between the support frames, a pull rope is fixed on the side of the splint close to the guide pulley, the other end of the pull rope is fixedly connected to the bottom end of the lifting frame, and the pull rope is clamped between the guide pulleys.

[0011] Preferably, a groove body matching the outer diameter of the crankshaft connecting rod journal is formed at the top end of the lifting plate, and a groove is formed inside the clamping plate.

[0012] Preferably, the displacement assembly also includes a support block fixed to the top of the lower movable plate, the support blocks are provided in two groups, each group of support blocks is provided with two support blocks, a threaded rod is rotatably connected between the support blocks, a first motor is installed at one end of the support block, the end of the rotating shaft of the first motor is fixedly connected to one end of the threaded rod, and the external thread of the threaded rod is connected to the movable block.

[0013] Preferably, a positioning block is fixed in the middle of the top of the lower movable plate, and a guide groove is opened at the bottom end of the upper movable plate. The guide groove is sleeved on the outside of the positioning block, and the guide groove is provided with three paths. The middle bending path is used to guide the upper movable plate, and the straight paths at both ends are used for resetting between the upper movable plate and the lower movable plate.

[0014] Preferably, a moving hole is opened inside the upper moving plate, and a pulling plate is fixed between the moving blocks, and the pulling plate forms a sliding structure inside the moving hole.

[0015] Preferably, rollers are rotatably connected inside both ends of the pull plate, and a plurality of rollers are provided, and the plurality of rollers are evenly spaced and distributed at both ends of the pull plate.

[0016] Preferably, guide grooves are provided at both ends of the lower movable plate, teeth are provided inside the guide grooves, a second motor is installed inside the processing table, a transmission block is fixed to the end of the rotating shaft of the second motor, a transmission gear is fixed to the top of the transmission block, the transmission gear extends inside the guide groove, and the transmission gear is meshingly connected with the teeth.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The crankshaft positioning and drilling device described in the present invention has a guide groove at the bottom end of the upper movable plate, and through the limiting of the positioning block, the upper movable plate can drive the crankshaft to move along the route of the guide groove, so that the upper movable plate can drive the crankshaft to automatically move the connecting rod journal to the position of the drill bit, which is convenient for positioning and drilling the crankshaft connecting rod journal, and the movement of the lower movable plate can drive the crankshaft to move in a straight line, which is more convenient for drilling the main journal of the crankshaft, thereby facilitating the drilling of the crankshaft and reducing the time consumed by manually adjusting the crankshaft position.

[0019] 2. The crankshaft positioning and drilling device described in the present invention can push the lifting plate downward by the pressure of the crankshaft by placing the crankshaft in the position between the clamps. The lifting plate drives the clamps to flip through the flip shaft to clamp the crankshaft in the position between the clamps. When the drill bit drills a hole in the crankshaft, downward pressure is applied to the crankshaft, which can drive the clamps to clamp the crankshaft again by pressing the lifting plate downward, thereby making the crankshaft more stable when the drill bit drills a hole in the crankshaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a stereogram of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the upper movable plate in the present invention;

[0023] Figure 3 It is a schematic diagram of the lifting frame structure in the present invention;

[0024] Figure 4 It is a partial cross-sectional view of the fixing seat in the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the lower movable plate in the present invention;

[0026] Figure 6 yes Figure 5 A partial enlarged view of the figure;

[0027] Figure 7 It is a schematic diagram of the guide groove structure in the present invention;

[0028] Figure 8It is a schematic diagram of the structure of the movable plate in the present invention.

[0029] In the figure: 1, processing table; 2, support column; 3, drilling machine; 31, drill bit; 4, upper moving plate; 41, lower moving plate; 411, positioning block; 412, guide slide groove; 413, tooth groove; 42, support block; 421, first motor; 422, threaded rod; 423, moving block; 424, pull plate; 425, roller; 43, second motor; 431, transmission block; 432, transmission gear; 44, guide groove; 45, moving hole; 5, clamping plate; 51, lifting frame; 511, electric telescopic rod; 512, pull rope; 52, guide pulley; 521, support frame; 53, fixed seat; 54, lifting plate; 55, turning axis; 541, sliding column; 542, spring; 543, fixed plate; 544, fixed frame. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] like Figure 1 to Figure 2 As shown, a crankshaft positioning drilling device according to an embodiment of the present invention comprises a processing table 1, a support column 2 is fixed at one end of the processing table 1, a drilling machine 3 is installed at the top of the support column 2, a displacement component for adjusting the position of the crankshaft is arranged at the top of the processing table 1; the displacement component comprises an upper movable plate 4 arranged above the processing table 1, a lower movable plate 41 is arranged below the upper movable plate 4; a clamping component for fixing the crankshaft is arranged above the upper movable plate 4;

[0032] When the crankshaft is processed, it is necessary to drill a hole on the outside of its connecting rod journal. Before drilling, the connecting rod journal position of the crankshaft is fixed by a clamping assembly, and then the position of the crankshaft is adjusted by a displacement assembly. The movement of the upper movable plate 4 can drive the crankshaft to adjust to the position for drilling a hole in the connecting rod journal, and then the drill bit 31 is driven by the drilling machine 3 to rotate, and the wrench of the drilling machine 3 is pulled to move the drill bit 31 downward to drill a hole in the crankshaft. After drilling, the upper movable plate 4 moves to drive the crankshaft to adjust to other drilling positions. After the connecting rod journal is drilled, the main journal is drilled. At this time, the crankshaft is driven to move in a straight line by the lower movable plate 41, and moves to the drilling position to drill a hole through the drill bit 31, so that it is convenient to drill holes in the connecting rod journal and the main journal.

[0033] like Figures 1 to 4As shown, the clamping assembly includes a fixed seat 53 fixed on the top of the upper movable plate 4, and two groups of symmetrically arranged clamping plates 5 are rotatably connected inside the fixed seat 53. A turning shaft 55 is fixed to the bottom end of the clamping plate 5, and a lifting plate 54 is arranged between the turning shafts 55. A plurality of racks are fixed at equal intervals on one side of the turning shaft 55 close to the lifting plate 54, and a plurality of racks are also fixed at equal intervals on both sides of the lifting plate 54 close to the turning shaft 55. The lifting plate 54 is meshed and connected through the rack turning shaft 55;

[0034] Before drilling the crankshaft, in order to keep the crankshaft stable during drilling, the crankshaft needs to be clamped and fixed. Before clamping, the two clamps 5 are in a V-shaped state. At this time, the lifting plate 54 is placed in the middle position of the clamps 5. When clamping, the connecting rod journal of the crankshaft is placed between the clamps 5. Then the crankshaft is released. At this time, the weight of the crankshaft presses the lifting plate 54 downward. The lifting plate 54 moves downward and drives the flip shaft 55 to flip through the rack. During the flipping process of the flip shaft 55, the clamp 5 is driven to the middle to clamp the crankshaft connecting rod journal. In this way, the crankshaft can be easily fixed on the top of the upper movable plate 4.

[0035] like Figures 1 to 4 As shown, a sliding column 541 is fixed to the bottom end of the lifting plate 54, a fixing plate 543 is fixed to the bottom end of the sliding column 541, a spring 542 is sleeved on the outside of the sliding column 541, the bottom end of the spring 542 is fixedly connected to the fixing plate 543, a fixing frame 544 is fixed to the top end of the spring 542, the bottom end of the fixing frame 544 is fixedly connected to the top end of the upper movable plate 4, and the sliding column 541 runs through the inside of the fixing frame 544;

[0036] Before the lifting plate 54 moves downward, the spring 542 is in a compressed state. During the downward movement of the lifting plate 54, the elastic force of the spring 542 pushes the fixed plate 543 downward, and the fixed plate 543 pulls the sliding column 541 downward. The sliding column 541 can assist the downward movement of the lifting plate 54, and during the process of the clamping plate 5 clamping the crankshaft, the elastic force of the spring 542 can keep the clamping plate 5 in a stable state, preventing the clamping plate 5 from being affected and opened during the drilling process.

[0037] like Figures 1 to 4As shown, four groups of splints 5 are provided, and each group of splints 5 is arranged at a position matching the crankshaft connecting rod journal, a lifting frame 51 is provided above the upper movable plate 4, and both ends of the bottom end of the lifting frame 51 are fixed with electric telescopic rods 511, and the bottom end of the electric telescopic rod 511 is fixedly connected to the top end of the upper movable plate 4, and a guide pulley 52 is provided on the side of the top end of the upper movable plate 4 away from the splint 5, and both sides of the guide pulley 52 are rotatably connected with support frames 521, and the bottom end of the support frame 521 is fixedly connected to the upper movable plate 4, and two guide pulleys 52 are provided between the support frames 521, and a pull rope 512 is fixed on the side of the splint 5 close to the guide pulley 52, and the other end of the pull rope 512 is fixedly connected to the bottom end of the lifting frame 51, and the pull rope 512 is clamped between the guide pulleys 52;

[0038] After the drilling is completed, the splint 5 needs to be separated from the crankshaft. At this time, the electric telescopic rod 511 is started to push the lifting frame 51 to move upward. At this time, the lifting frame 51 drives the pull rope 512 to move. Because the guide pulley 52 guides the pull rope 512, the pull rope 512 can pull the splint 5 horizontally, so that the splint 5 can be unfolded to both sides. During the unfolding process of the splint 5, the lifting plate 54 is driven to rise through the turning shaft 55. The lifting plate 54 can push the crankshaft upward from between the splints 5, which can make it easier to take out the crankshaft. When the crankshaft is fixed, the electric telescopic rod 511 will drive the lifting frame 51 to the lowest position. At this time, the pull rope 512 loses its tension, which can make it easier for the splint 5 to fix the crankshaft through the pressure of the crankshaft and the elastic force of the spring 542.

[0039] like Figures 1 to 4 As shown, the top of the lifting plate 54 is provided with a groove body matching the outer diameter of the crankshaft connecting rod journal, and the interior of the clamping plate 5 is provided with a groove;

[0040] During the drilling process, the crankshaft connecting rod journal is fixed inside the groove of the lifting plate 54. The drill bit 31 will apply a downward thrust to the crankshaft when drilling. At this time, the thrust of the crankshaft will push the lifting plate 54 downward. The lifting plate 54 drives the clamping plate 5 to continue to flip through the flip shaft 55, which can clamp the crankshaft connecting rod journal tighter, and can achieve a more stable clamping of the crankshaft on the top of the upper movable plate 4.

[0041] like Figures 1 to 5 As shown, the displacement assembly also includes a support block 42 fixed to the top of the lower moving plate 41, and the support blocks 42 are provided in two groups, each group of support blocks 42 is provided with two support blocks, and a threaded rod 422 is rotatably connected between the support blocks 42, and a first motor 421 is installed at one end of the support block 42, and the end of the rotating shaft of the first motor 421 is fixedly connected to one end of the threaded rod 422, and the outer thread of the threaded rod 422 is connected to a moving block 423;

[0042] When drilling a hole in the crankshaft connecting rod journal, it is necessary to adjust the position of the upper movable plate 4, and the lower movable plate 41 remains in its original position. At this time, the two first motors 421 are started to drive the threaded rod 422 to rotate, and the threaded rod 422 drives the moving block 423 to move. The moving block 423 can drive the upper movable plate 4 to move its position. At this time, the crankshaft at the top of the upper movable plate 4 moves with the upper movable plate 4. During the movement, the crankshaft can be driven to adjust the position of the hole to be drilled to match the position of the drill bit 31, so that the position of the crankshaft at the top of the upper movable plate 4 can be adjusted to reduce manual operation.

[0043] like Figures 1 to 8 As shown, a positioning block 411 is fixed in the middle of the top of the lower moving plate 41, and a guide groove 44 is provided at the bottom of the upper moving plate 4. The guide groove 44 is sleeved on the outside of the positioning block 411. The guide groove 44 is provided with three sections of paths. The middle bending path is used to guide the upper moving plate 4, and the straight paths at both ends are used to reset the upper moving plate 4 and the lower moving plate 41.

[0044] Because the connecting rod journals of the crankshaft are in a cross-dispersed position, they need to be adjusted to the corresponding position when moving. When the moving block 423 drives the upper moving plate 4 to move, the upper moving plate 4 moves at the top of the lower moving plate 41. During this process, the guide groove 44 slides on the outside of the positioning block 411. The path of the guide groove 44 can guide the movement of the upper moving plate 4. When the positioning block 411 passes through the straight path of the guide groove 44, the upper moving plate 4 will be kept in a straight movement state. When the positioning block 411 passes through the curved path of the guide groove 44, the upper moving plate 4 will be reciprocated to both sides due to the guidance of the path. When the position of the connecting rod journal of the crankshaft matches the position of the drill bit 31 during the reciprocating movement, the first motor 421 stops rotating, so that the upper moving plate 4 can be fixed, and then the crankshaft can be drilled. In this way, the positioning block 411 passes through the entire path, and the positioning drilling of the crankshaft connecting rod journal can be realized.

[0045] like Figures 1 to 8 As shown, a moving hole 45 is opened inside the upper moving plate 4, and a pull plate 424 is fixed between the moving blocks 423, and the pull plate 424 forms a sliding structure inside the moving hole 45;

[0046] When the moving block 423 drives the upper moving plate 4 to move, the upper moving plate 4 can be pulled to move by inserting the pull plate 424 into the moving hole 45. During the movement of the upper moving plate 4, it will reciprocate toward both ends due to the path of the guide groove 44. At this time, the parts of the pull plate 424 extending from the moving hole 45 at both ends can provide guidance for the upper moving plate 4 when it moves, so that the upper moving plate 4 can move stably on the top of the lower moving plate 41.

[0047] like Figures 1 to 8As shown, rollers 425 are rotatably connected inside the two ends of the pull plate 424, and a plurality of rollers 425 are provided, and the plurality of rollers 425 are evenly spaced and distributed at the two ends of the pull plate 424;

[0048] When the upper movable plate 4 reciprocates through the movable hole 45 on the outside of the pulling plate 424, the pulling plate 424 will rub against the inner wall of the movable hole 45, which will cause wear between the upper movable plate 4 and the pulling plate 424. A plurality of rollers 425 are arranged inside the pulling plate 424. When the movable hole 45 moves outside the pulling plate 424, the rollers 425 contact and roll with the inner wall of the movable hole 45, thereby reducing the friction between the movable hole 45 and the pulling plate 424.

[0049] like Figures 1 to 8 As shown, both sides of the lower moving plate 41 are provided with guide slots 412, and tooth slots 413 are provided inside the guide slots 412. A second motor 43 is installed inside the processing table 1, and a transmission block 431 is fixed to the end of the rotating shaft of the second motor 43. A transmission gear 432 is fixed to the top of the transmission block 431. The transmission gear 432 extends inside the guide slots 412, and the transmission gear 432 is meshed and connected with the tooth slots 413.

[0050] After drilling the connecting rod journal of the crankshaft, the main journal is then drilled. At this time, the first motor 421 is started to drive the upper movable plate 4 to move. When the upper movable plate 4 moves to the middle position of the lower movable plate 41, the first motor 421 stops rotating. At this time, the crankshaft is in the middle position of the upper movable plate 4 and the lower movable plate 41. At this time, the second motor 43 is started to rotate to drive the transmission block 431 to rotate, and the transmission block 431 drives the transmission gear 432 to rotate. The transmission gear 432 rotates and engages with the tooth groove 413 to drive the lower movable plate 41 to move. The rotation of the second motor 43 at both ends can keep the lower movable plate 41 moving in a straight line. At this time, the lower movable plate 41 drives the crankshaft to move in a straight line through the upper movable plate 4, and the second motor 43 is stopped after moving to the position where the main journal matches the drill bit 31. Then the crankshaft is drilled. In this way, holes are drilled in multiple positions of the crankshaft main journal. During the movement of the lower movable plate 41, the transmission gear 432 rotates inside the guide slot 412 to play a role of limiting guide, which can achieve more stable drilling of the crankshaft.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A crankshaft positioning drilling device, characterized in that: It comprises a processing table (1), a support column (2) is fixed at one end of the processing table (1), a drilling machine (3) is installed at the top end of the support column (2), and a displacement component for adjusting the position of the crankshaft is arranged at the top end of the processing table (1); The displacement assembly comprises an upper movable plate (4) arranged above the processing table (1), and a lower movable plate (41) is arranged below the upper movable plate (4); A clamping assembly for fixing the crankshaft is arranged above the upper movable plate (4).

2. A crankshaft positioning drilling device according to claim 1, characterized in that: The clamping assembly comprises a fixed seat (53) fixed on the top of the upper movable plate (4), two groups of symmetrically arranged clamping plates (5) are rotatably connected inside the fixed seat (53), a turning shaft (55) is fixed at the bottom end of the clamping plate (5), a lifting plate (54) is arranged between the turning shafts (55), a plurality of racks are fixed at equal intervals on one side of the turning shaft (55) close to the lifting plate (54), and a plurality of racks are also fixed at equal intervals on both sides of the lifting plate (54) close to the turning shaft (55), and the lifting plate (54) is meshedly connected via the rack turning shaft (55).

3. A crankshaft positioning drilling device according to claim 2, characterized in that: A sliding column (541) is fixed to the bottom end of the lifting plate (54), a fixed plate (543) is fixed to the bottom end of the sliding column (541), a spring (542) is sleeved on the outside of the sliding column (541), the bottom end of the spring (542) is fixedly connected to the fixed plate (543), a fixing frame (544) is fixed to the top end of the spring (542), the bottom end of the fixing frame (544) is fixedly connected to the top end of the upper movable plate (4), and the sliding column (541) runs through the inside of the fixing frame (544).

4. A crankshaft positioning drilling device according to claim 3, characterized in that: The clamping plates (5) are provided in four groups, and each group of clamping plates (5) is arranged at a position matching the crankshaft connecting rod journal. A lifting frame (51) is provided above the upper movable plate (4), and both ends of the bottom end of the lifting frame (51) are fixed with electric telescopic rods (511), and the bottom end of the electric telescopic rod (511) is fixedly connected to the top end of the upper movable plate (4). A guide pulley (52) is provided on the side of the top end of the upper movable plate (4) away from the clamping plates (5). Both sides of the pulley (52) are rotatably connected to support frames (521), the bottom ends of the support frames (521) are fixedly connected to the upper movable plate (4), two guide pulleys (52) are arranged between the support frames (521), a pull rope (512) is fixed on one side of the clamping plate (5) close to the guide pulley (52), the other end of the pull rope (512) is fixedly connected to the bottom end of the lifting frame (51), and the pull rope (512) is clamped between the guide pulleys (52).

5. A crankshaft positioning drilling device according to claim 4, characterized in that: A groove body matching the outer diameter of the crankshaft connecting rod journal is formed at the top end of the lifting plate (54), and a groove is formed inside the clamping plate (5).

6. A crankshaft positioning drilling device according to claim 5, characterized in that: The displacement assembly further comprises a support block (42) fixed to the top end of the lower movable plate (41); the support block (42) is provided in two groups, each group of support blocks (42) is provided with two support blocks; a threaded rod (422) is rotatably connected between the support blocks (42); a first motor (421) is installed at one end of the support block (42); the end of the rotating shaft of the first motor (421) is fixedly connected to one end of the threaded rod (422); and the outer thread of the threaded rod (422) is connected to a moving block (423).

7. A crankshaft positioning drilling device according to claim 6, characterized in that: A positioning block (411) is fixed in the middle of the top of the lower movable plate (41), and a guide groove (44) is provided at the bottom of the upper movable plate (4). The guide groove (44) is sleeved on the outside of the positioning block (411), and the guide groove (44) is provided with three sections of paths, wherein the middle bending path is used for guiding the upper movable plate (4), and the straight paths at both ends are used for resetting between the upper movable plate (4) and the lower movable plate (41).

8. A crankshaft positioning drilling device according to claim 7, characterized in that: A moving hole (45) is provided inside the upper moving plate (4), a pulling plate (424) is fixed between the moving blocks (423), and the pulling plate (424) forms a sliding structure inside the moving hole (45).

9. A crankshaft positioning drilling device according to claim 8, characterized in that: Rollers (425) are rotatably connected inside the two ends of the pulling plate (424), and a plurality of rollers (425) are provided. The plurality of rollers (425) are evenly spaced and distributed at the two ends of the pulling plate (424).

10. A crankshaft positioning drilling device according to claim 9, characterized in that: Both ends of the lower movable plate (41) are provided with guide grooves (412), and tooth grooves (413) are arranged inside the guide grooves (412). A second motor (43) is installed inside the processing table (1), and a transmission block (431) is fixed to the end of the rotating shaft of the second motor (43), and a transmission gear (432) is fixed to the top of the transmission block (431). The transmission gear (432) extends inside the guide groove (412), and the transmission gear (432) is meshedly connected with the tooth groove (413).

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