Special drilling machine for machining bogie side frame stand column wearing plate mounting hole

Abstract

The invention relates to machining of a bogie side frame stand column wearing plate mounting hole, in particular to a special drilling machine for machining the bogie side frame stand column wearing plate mounting hole, which comprises a box-shaped cooling liquid storage box base (1) filled with cooling liquid, the three-phase asynchronous motor (2), the track base (4), the right side support (8) and the left side support (15) are installed on the upper surface of the cooling liquid storage box body base (1), an outer spline shaft (30) and a lead screw (33) which are in parallel relation are installed on the track base (4), the three-phase asynchronous motor (2) is in transmission connection with the outer spline shaft (30) through a transmission belt (28) in a transmission mode, and the outer spline shaft (30) is in transmission connection with the lead screw (33) through a gear. The device is small and exquisite in structure, capable of completing drilling, feeding and resetting movement through a single power source, reliable in operation, high in efficiency, easy to operate, high in repeated positioning capacity, capable of controlling the movement direction only by controlling forward and reverse rotation of the motor, free of a complex control system and low in cost.

Description

Technical Field

[0001] The invention relates to the processing of a wear plate mounting hole of a bogie side frame column, and in particular to a special drilling machine for processing the wear plate mounting hole of a bogie side frame column. Background Art

[0002] The processing of the mounting holes of the wear plates of the bogie side frame columns usually involves two methods: manual drilling or special drilling. Traditional drilling machines usually require multiple power sources to provide power for drilling, feeding and resetting movements, which have complex structures, long processing times, large volumes, complex control systems, more frequent maintenance cycles and higher operator requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to provide a drilling machine suitable for machining the mounting holes of the wear plates of the bogie side frame columns, which overcomes the technical problems mentioned in the background.

[0004] The technical scheme adopted by the present invention is: a special drilling machine for machining the mounting hole of the wear plate of the bogie side frame column, comprising a box-shaped coolant storage box base (1) with coolant inside, a three-phase asynchronous motor (2), a track base (4), a right support (8) and a left support (15) installed on the upper surface of the coolant storage box base (1), an external spline shaft (30) and a screw (33) in a parallel relationship are installed on the track base (4), the three-phase asynchronous motor (2) is connected to the external spline shaft (30) by belt transmission through a transmission belt (28), the external spline shaft (30) and the screw (33) are connected by gear transmission, a screw stopper is installed at one end of the screw (33), a linear track (43) is installed on the track base (4), and a drilling box (6) is installed on the linear track. (43) and is linearly slidably connected with the linear rail (43), the external spline shaft (30) and the screw rod (33) pass through the drill box (6), the external spline shaft (30) in the drill box (6) is sleeved with an internal spline shaft (44) through internal and external spline matching, when the drill box (6) moves along the linear rail (43), the internal spline shaft (44) moves linearly on the external spline shaft (30), when the external spline shaft (30) rotates, the internal spline shaft (44) rotates synchronously, a gear set (50) is arranged inside the drill box (6), the gear set (50) includes a plurality of intermediate gears and a plurality of drill gears, a drill bit (7) is installed on the central axis of each drill gear, the three-phase asynchronous motor (2) drives the internal spline shaft (44) to rotate, and then drives the drill bit (7) to rotate through the gear set (50) to complete the drilling action.

[0005] The right support (8) is fixedly connected to the right positioning block (9) and the first cylinder mounting frame (10), the left support (15) is fixedly connected to the left positioning block (16) and the second cylinder mounting frame (17), the first cylinder mounting frame (10) is provided with a first cylinder (11), the second cylinder mounting frame (17) is provided with a second cylinder (18), the cylinder telescopic arm of the first cylinder (11) is connected to the first top block (12), the cylinder telescopic arm of the second cylinder (18) is connected to the second top block (19), the first cylinder (11) and the second cylinder mounting frame (17) are connected to an air pipe assembly (13), the air pipe assembly (13) is connected to a manual reversing valve (14), and the telescopic action of the first cylinder (11) and the second cylinder (18) can be controlled by rotating a handle of the manual reversing valve (14). A liquid pump mounting plate (20) is fixed on the coolant storage box base (1), a three-phase electric pump (21) is mounted on the liquid pump mounting plate (20), a liquid outlet of the three-phase electric pump (21) is connected to a coolant delivery pipe assembly (22), a liquid inlet of the three-phase electric pump (21) is placed below the coolant liquid level of the coolant storage box base (1), a manual ball valve (23) for manually controlling the delivery amount of the coolant is provided on the coolant delivery pipe assembly (22), the manual ball valve (23) is connected to a coolant distribution block (24), the coolant distribution block (24) is connected to a coolant delivery copper pipe assembly (25), the coolant delivery copper pipe assembly (25) delivers the coolant to the drilling position, a return port is provided on the coolant storage box base (1) corresponding to the drilling position, a filter screen (26) is mounted on the return port, the coolant flowing out during the drilling process flows back into the box in the coolant storage box base (1) through the filter screen (26), and the coolant is circulated. A spline shaft pulley (29) and a spline shaft gear (31) are provided on the external spline shaft (30), a motor pulley (27) is fixed to the output shaft end of the three-phase asynchronous motor (2), a transmission belt (28) connects the spline shaft pulley (29) and the motor pulley (27), a pulley protective cover (3) is installed on the outer side of the transmission belt (28), a screw gear (32) is provided on the screw (33), and the spline shaft gear (31) is meshed with the screw gear (32).

[0006] The screw stopper comprises a coupling (34) at one end of the screw (33) and movable linearly on the screw (33), a compression spring (36) between the coupling (34) and the screw gear (32) and sleeved on the screw (33), and a coupling stopper (35) at one end of the coupling (34), a spline-shaped protrusion on the side of the screw gear (32) facing the coupling (34), and a spline-shaped protrusion on the side of the coupling (34) facing the screw gear (32) and engaging with the coupling (34). When the compression spring (36) is compressed and the spline-shaped projection and the spline-shaped recess are engaged, the screw gear (32) rotates together with the coupling (34), and the coupling stop seat (35) prevents the coupling (34) from rotating, thereby preventing the screw (33) from rotating. When the compression spring (36) is stretched again, the spline-shaped projection and the spline-shaped recess are not in contact, and when the screw gear (32) rotates, the coupling (34) is stationary under the action of the coupling stop seat (35); The coupling (34) has a groove in the middle, and a shift block (37) is symmetrically arranged at the groove in the middle of the coupling (34). The shift block (37) is mounted on the shift fork (38) through a threaded connection. The shift fork (38) is mounted and fixed on the shift fork shaft (39). The shift fork shaft (39) is mounted on the track base (4). A rotating handle seat (40) is provided at one end of the shift fork shaft (39). The rotating handle seat (40) is connected to a rotating handle (41). The handle (41) is rotated counterclockwise to drive the shift fork shaft (39) to rotate counterclockwise, thereby driving the shift fork (38) to rotate counterclockwise, driving the coupling (34) to move along the lead screw (33) and then engage with the lead screw gear (32).

[0007] The gear set (50) comprises a first gear (45), a first worm (46), a first worm wheel (47), a second worm (48), a second worm wheel (49), an intermediate transmission gear, and a drill gear. The first gear (45) is fixedly mounted on the first worm (46). The first worm (46) meshes with the first worm wheel (47). The first worm wheel (47) is fixedly mounted on the second worm (48). The second worm (48) meshes with the second worm wheel (49). The second worm wheel (49) has a central oil-carrying through hole with an internal thread. The internal thread of the second worm gear (49) is meshed with the external thread of the screw rod (33). The screw rod (33) rotates to drive the drill box (6) to move along the screw rod (33). The first gear (45) is meshed with the internal spline shaft (44). There are multiple intermediate transmission gears that are meshed in sequence. The intermediate transmission gear at the head is meshed with the internal spline shaft (44). There are four drill gears. The intermediate transmission gear at the tail is meshed with each drill gear. Each drill gear is fixed on a drill gear shaft. A drill bit (7) is installed on each drill gear shaft.

[0008] The beneficial effects of the present invention are: compact structure, single power source to complete drilling, feeding and resetting movements, reliable operation and high efficiency, simple operation, strong repeatable positioning ability, only controlling the forward and reverse rotation of the motor to control the movement direction without complex control system, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a main schematic diagram of the present invention; Figure 2 It is a top view schematic diagram of the present invention; Figure 3 This is a schematic diagram of the drill box transmission of the present invention; Figure 4 It is a schematic diagram of the drilling box of the present invention; Figure 5 yes Figure 4 AA cross-sectional diagram of ; Figure 6 It is a schematic diagram of a partial cross-sectional view of the drilling box of the present invention Figure 7 It is a front view schematic diagram of machining the mounting hole of the wear plate of the bogie side frame column according to the present invention; Figure 8 A schematic diagram of machining a mounting hole for a wear plate of a bogie side frame column according to the present invention; Fig. 9 is a three-dimensional schematic diagram of the gear set of the present invention; Fig.10 It is a three-dimensional schematic diagram of the external spline shaft of the present invention; Fig.11 It is a three-dimensional schematic diagram of the internal spline shaft of the present invention; In the accompanying drawings, the list of parts represented by each reference number is as follows: 1-coolant storage box base, 2-three-phase asynchronous motor, 3-pulley protective cover, 4-track base, 5-telescopic cover, 6-drill box, 7-drill bit, 8-right support, 9-right positioning block, 10-first cylinder mounting frame, 11-first cylinder, 12-first top block, 13-air pipe assembly, 14-manual reversing valve, 15-left support, 16-left positioning block, 17-second cylinder mounting frame, 18-second cylinder, 19-second top block, 20-liquid pump mounting plate, 21-three-phase electric pump, 22-coolant delivery pipe assembly, 23-manual ball valve, 24-coolant Cooling liquid distribution block, 25-cooling liquid delivery copper tube group, 26-filter screen, 27-motor pulley, 28-transmission belt, 29-spline shaft pulley, 30-external spline shaft, 31-spline shaft gear, 32-screw gear, 33-screw, 34-coupling, 35-stop seat for coupling, 36-compression spring, 37-shift block, 38-shift fork, 39-shift fork shaft, 40-rotating handle seat, 41-rotating handle, 42-drill box mounting seat, 43-linear rail, 44-internal spline shaft, 45-first gear, 46-first worm, 47-first worm wheel, 48-second worm, 49-second worm wheel, 50-gear set. DETAILED DESCRIPTION

[0010] like Figure 1-11 As shown, the preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0011] A special drilling machine for machining mounting holes of wear plates of bogie side frame columns, comprising a coolant storage box base 1, a three-phase asynchronous motor 2 (it may also be other types of motors), a pulley protective cover 3, a track base 4, a telescopic cover 5, a drill box 6, a drill bit 7, a right side support 8, a right side positioning block 9, a first cylinder mounting frame 10, a first cylinder 11, a first top block 12, an air pipe assembly 13, a manual reversing valve 14, a left side support 15, a left side positioning block 16, a second cylinder mounting frame 17, a second cylinder 18, a second top block 19, a liquid pump mounting plate 20, a three-phase electric pump 21 (water pump), and a coolant delivery pipe assembly 22. Manual ball valve 23. Coolant distribution block 24. Coolant delivery copper tube set 25. Filter screen 26. Motor pulley 27. Drive belt 28. Spline shaft pulley 29. External spline shaft 30. Spline shaft gear 31. Screw gear 32. Screw 33. Coupling 34. Coupling stopper 35. Compression spring 36. Shift block 37. Shift fork 38. Shift fork shaft 39. Rotating handle seat 40. Rotating handle 41. Drill box mounting seat 42. Linear rail 43. Internal spline shaft 44. First gear 45. First worm 46. First worm wheel 47. Second worm 48. Second worm wheel 49. Gear set 50.

[0012] The coolant storage box base 1 is a box structure, and coolant is stored inside. A three-phase asynchronous motor 2 is installed on the upper surface of the coolant storage box base 1. The output shaft end of the three-phase asynchronous motor 2 has a pulley protective cover 3 (used to cover the motor pulley 27, the transmission belt 28, and the spline shaft pulley 29). The output shaft end of the three-phase asynchronous motor 2 is fixed with a motor pulley 27, and a transmission belt 28 is arranged at the motor pulley 27. The other end of the transmission belt 28 is connected to the spline shaft pulley 29. The spline shaft pulley 29 is installed and fixed on the external spline shaft 30. The two rotate synchronously. The support seat of the external spline shaft 30 is installed on the track base 4 (the track base 4 includes an open rectangular The outer spline shaft 30 is mounted on the left and right side plates of the rectangular box body, and a support seat for the outer spline shaft 30 is installed on each side plate of the rectangular box body. The end (right end) of the outer spline shaft 30 is fixed with a spline shaft gear 31, and the two rotate synchronously. The spline shaft gear 31 is meshed with the screw gear 32, and the screw gear 32 is sleeved on the screw 33. A compression spring 36 is provided on one side of the screw gear 32, and the compression spring 36 is sleeved on the screw 33. A coupling 34 is provided at the other end of the compression spring 36. The coupling 34 has an inner rectangular spline and an outer spline at the corresponding position of the screw 33. The coupling 34 can slide along the screw 33 and the two rotate synchronously. A coupling stopper is provided at the other end of the coupling 34. The coupling stopper 35 is fixed on the track base 4 (the right extension plate of the rectangular box body). When the coupling 34 is engaged with the coupling stopper 35, the coupling 34 can be prevented from rotating, thereby preventing the screw 33 from rotating. When the coupling 34 is engaged with the screw gear 32, the screw gear 32 can drive the coupling 34 to rotate, thereby driving the screw 33 to rotate. There are symmetrically arranged shift blocks 37 in the groove in the middle of the coupling 34. The shift blocks 37 are installed on the shift fork 38. The shift blocks 37 can rotate relative to the shift fork 38. The shift fork 38 is installed and fixed on the shift fork shaft 39 and the two can rotate synchronously. The shift fork shaft 39 is supported (seated) on the track base 4. The shift fork shaft 3 9 has a rotating handle seat 40 at one end and the two can rotate synchronously, and a rotating handle 41 is provided at one end of the rotating handle seat 40. Counterclockwise rotation of the handle 41 can drive the fork shaft 39 to rotate counterclockwise, thereby driving the fork 38 to rotate counterclockwise, driving the coupling 34 to move along the screw rod 33 and then engage or not engage with the screw rod gear 32. There is a drill box 6 on the external spline shaft 30 and the screw rod 33. The drill box 6 is mounted and fixed on the drill box mounting seat 42. The drill box mounting seat 42 is fixed on the linear rail 43. The drill box 6 and the drill box mounting seat 42 can move along the linear rail 43, and the linear rail 43 is fixed on the track base 4 (the front and rear sides of the rectangular box bottom plate of the track base 4), as shown in FIG. Figure 4-Figure 6As shown, the drill box 6 contains an inner spline shaft 44, which meshes with a gear set 50. The inner spline shaft 44 and the outer spline shaft 30 are matched through inner and outer splines. The inner spline shaft 44 can rotate synchronously with the outer spline shaft 30 and the spline shaft 44 can move along the outer spline shaft 30. The gear set 50 has a drill bit 7. The outer spline shaft 30 can drive the inner spline shaft 44 to rotate, thereby driving the gear set 50 to move, thereby driving the drill bit 7 to rotate to complete the drilling action. Fig. 9 As shown, in one embodiment, there are four gears in the gear set 50 on which the drill bit 7 is installed.

[0013] like Figure 4-6 As shown, the inner spline shaft 44 is meshed with the first gear 45, the first gear 45 is set and fixed on the first worm 46 and the two can rotate synchronously, the worm part on the first worm 46 is meshed with the first worm wheel 47, the first worm wheel 47 is set on the second worm 48 and the two can rotate synchronously, the second worm 48 is meshed with the second worm wheel 49, the inner hole of the second worm wheel 49 has an internal trapezoidal thread, and the screw 33 has an external trapezoidal thread. The second worm wheel 49 cooperates with the screw 33 to rotate to drive the drill box 6 to move along the screw 33. When the screw 33 does not rotate, the drill box 6 moves slowly along the screw 33 to complete the relatively slow feed motion when drilling. When the screw 33 rotates, the drill box 6 moves quickly along the screw 33 to complete the relatively fast reset motion after drilling is completed.

[0014] A right side support 8 and a left side support 15 are fixed on the coolant storage box base 1, a right side positioning block 9 is fixed on the right side support 8, a first cylinder mounting frame 10 is fixed on the right side support 8, a first cylinder 11 is fixed on the first cylinder mounting frame 10, the telescopic arm of the first cylinder 11 has a first top block 12, an air pipe assembly 13 is provided on the first cylinder 11, and the air pipe assembly 13 is connected to a manual reversing valve 14, a left side positioning block 16 is fixed on the left side support 15, a second cylinder mounting frame 17 is fixed on the left side support 15, a second cylinder 18 is fixed on the second cylinder mounting frame 17, the telescopic arm of the second cylinder 18 has a second top block 19, and the second cylinder 18 has an air pipe assembly 13. The actions of the first cylinder 11 and the second cylinder 18 can be controlled by rotating the handle of the manual reversing valve 14.

[0015] A liquid pump mounting plate 20 is fixed on the coolant storage box base 1, and a three-phase electric pump 21 is installed on the liquid pump mounting plate 20. The liquid outlet of the three-phase electric pump 21 is connected to a coolant delivery pipe assembly 22. The liquid inlet of the three-phase electric pump is placed below the surface of the coolant stored in the coolant storage box base 1, and the coolant can be delivered to the coolant delivery pipe assembly 22. The coolant delivery pipe assembly 22 is fixed on the drilling box 6 and the two move synchronously. A manual ball valve 23 is provided at the end of the coolant delivery pipe assembly 22 to manually control the delivery amount of the coolant. The manual ball valve 23 is connected to a coolant distribution block 24, and the coolant distribution block 24 is connected to a coolant delivery copper pipe group 25. The coolant delivery copper pipe group 25 can deliver the coolant to the drilling position. A filter screen 26 is fixed on the coolant storage box base 1. The coolant flowing out during the drilling process can flow from the filter screen 26 back into the box in the coolant storage box base 1 to complete the recycling of the coolant.

[0016] The bogie side frame is placed on the right support 8 and the left support 15, and the right positioning block 9 and the left positioning block 16 complete the left and right and forward positioning of the bogie side frame. At the same time, the manual reversing valve 14 is turned to control the first cylinder 11 and the second cylinder 18 to move, so that the first top block 12 and the second top block 19 are in contact with the side frame, and the right positioning block 9 and the left positioning block 16 are used to clamp and fix the side frame. The three-phase asynchronous motor 2 starts to rotate forward, driving the motor pulley 27 to rotate, and the spline shaft pulley 29 is driven by the transmission belt 28 to rotate, and the spline shaft pulley 29 is driven by the transmission belt 28. The outer spline shaft 30 is driven to rotate, and the outer spline shaft 30 drives the inner spline shaft 44 to rotate, and the inner spline shaft 44 drives the gear set 50 to rotate, and the gear set 50 drives the drill bit 7 to rotate to complete the main movement of drilling. At the same time, the outer spline shaft 30 drives the spline shaft gear 31 to rotate, and the spline shaft gear 31 makes the screw gear 32 rotate through meshing. The handle 41 is not rotated during the drilling process, and the compression spring 36 presses the coupling 34 to the rightmost end. The coupling 34 and the coupling stop seat 35 are engaged, and the screw 33 is prevented from rotating through the spline pair. The spline shaft gear 31 drives The inner spline shaft 44 rotates, the inner spline shaft 44 drives the first gear 45 to rotate, the first gear 45 drives the first worm 46 to rotate, the first worm 46 drives the first worm wheel 47 to rotate, the first worm wheel 47 drives the second worm 48 to rotate, the second worm 48 drives the second worm wheel 49 to rotate, so that the drill box 6 moves slowly along the screw 33 to complete the feeding movement. When a quick reset is required, the rotating handle 41 is rotated to drive the rotating handle seat 40 to rotate, the rotating handle seat 40 drives the fork shaft 39 to rotate, and the fork shaft 39 drives the shift block 37 and the shift fork 38 to swing The shift block 37 drives the coupling 34 to overcome the compression spring 36 and mesh with the screw gear 32, the screw gear 32 drives the coupling 34 to rotate, the coupling 34 drives the screw 33 to rotate through the spline pair, and rotates with the second worm gear 49, so that the drill box 6 moves quickly along the screw 33 to complete the reset movement. When the drill bit 7 completes the drilling task on one side of the side frame, the three-phase asynchronous motor 2 reverses, and the drilling task on the other side is completed by operating the rotating handle 41. After the side frame drilling task is completed, the manual reversing valve 14 is operated to loosen the side frame to complete all operations.

[0017] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A special drilling machine for machining the mounting holes of wear plates of bogie side frame columns, characterized in that: The invention comprises a box-shaped coolant storage box base (1) containing coolant inside, a three-phase asynchronous motor (2) mounted on the upper surface of the coolant storage box base (1), a track base (4), a right support (8) and a left support (15), an external spline shaft (30) and a lead screw (33) in parallel relationship are mounted on the track base (4), the three-phase asynchronous motor (2) is connected to the external spline shaft (30) by a transmission belt (28), the external spline shaft (30) is connected to the lead screw (33) by a gear transmission, a lead screw stopper is mounted on one end of the lead screw (33), a linear track (43) is mounted on the track base (4), and a drill box (6) is mounted on the linear track (43) and is linearly slidable with the linear track (43). The outer spline shaft (30) and the screw rod (33) pass through the drill box (6). The outer spline shaft (30) in the drill box (6) is sleeved with an inner spline shaft (44) through inner and outer spline fittings. When the drill box (6) moves along the linear track (43), the inner spline shaft (44) moves linearly on the outer spline shaft (30). When the outer spline shaft (30) rotates, the inner spline shaft (44) rotates synchronously. A gear set (50) is provided inside the drill box (6). The gear set (50) includes a plurality of intermediate gears and a plurality of drill gears. A drill bit (7) is installed on the central axis of each drill gear. The three-phase asynchronous motor (2) drives the inner spline shaft (44) to rotate, and then drives the drill bit (7) to rotate through the gear set (50) to complete the drilling action.

2. A special drilling machine for machining the mounting holes of the wear plates of the bogie side frame columns according to claim 1, characterized in that: The right support (8) is fixedly connected to the right positioning block (9) and the first cylinder mounting frame (10), the left support (15) is fixedly connected to the left positioning block (16) and the second cylinder mounting frame (17), the first cylinder mounting frame (10) is provided with a first cylinder (11), the second cylinder mounting frame (17) is provided with a second cylinder (18), the cylinder telescopic arm of the first cylinder (11) is connected to the first top block (12), the cylinder telescopic arm of the second cylinder (18) is connected to the second top block (19), the first cylinder (11) and the second cylinder mounting frame (17) are connected to an air pipe assembly (13), the air pipe assembly (13) is connected to a manual reversing valve (14), and the telescopic action of the first cylinder (11) and the second cylinder (18) can be controlled by rotating a handle of the manual reversing valve (14).

3. A special drilling machine for machining the mounting holes of wear plates of bogie side frame columns according to claim 1, characterized in that: A liquid pump mounting plate (20) is fixed on the coolant storage box base (1), a three-phase electric pump (21) is mounted on the liquid pump mounting plate (20), a liquid outlet of the three-phase electric pump (21) is connected to a coolant delivery pipe assembly (22), a liquid inlet of the three-phase electric pump (21) is placed below the coolant liquid level of the coolant storage box base (1), a manual ball valve (23) for manually controlling the delivery amount of the coolant is provided on the coolant delivery pipe assembly (22), the manual ball valve (23) is connected to a coolant distribution block (24), the coolant distribution block (24) is connected to a coolant delivery copper pipe assembly (25), the coolant delivery copper pipe assembly (25) delivers the coolant to the drilling position, a return port is provided on the coolant storage box base (1) corresponding to the drilling position, a filter screen (26) is mounted on the return port, the coolant flowing out during the drilling process flows back into the box in the coolant storage box base (1) through the filter screen (26), and the coolant is circulated.

4. A special drilling machine for machining the mounting holes of the wear plates of the bogie side frame columns according to claim 1, characterized in that: A spline shaft pulley (29) and a spline shaft gear (31) are provided on the external spline shaft (30), a motor pulley (27) is fixed to the output shaft end of the three-phase asynchronous motor (2), a transmission belt (28) connects the spline shaft pulley (29) and the motor pulley (27), a pulley protective cover (3) is installed on the outer side of the transmission belt (28), a screw gear (32) is provided on the screw (33), and the spline shaft gear (31) is meshed with the screw gear (32).

5. A special drilling machine for machining the mounting holes of wear plates of bogie side frame columns according to claim 1, characterized in that: The screw stopper comprises a coupling (34) at one end of the screw (33) and movable linearly on the screw (33), a compression spring (36) between the coupling (34) and the screw gear (32) and sleeved on the screw (33), and a coupling stopper (35) at one end of the coupling (34), a spline-shaped protrusion on the side of the screw gear (32) facing the coupling (34), and a spline-shaped protrusion on the side of the coupling (34) facing the screw gear (32) and engaging with the coupling (34). When the compression spring (36) is compressed and the spline-shaped projection and the spline-shaped recess are engaged, the screw gear (32) rotates together with the coupling (34). When the coupling stop seat (35) stops the coupling (34) from rotating, the screw (33) is further stopped from rotating. When the compression spring (36) is restored to extend, the spline-shaped projection and the spline-shaped recess are not in contact. When the screw gear (32) rotates, the coupling (34) is stationary under the action of the coupling stop seat (35).

6. A special drilling machine for machining the mounting holes of the wear plates of the bogie side frame columns according to claim 5, characterized in that: The coupling (34) has a groove in the middle, and a shift block (37) is symmetrically arranged at the groove in the middle of the coupling (34). The shift block (37) is mounted on the shift fork (38) through a threaded connection. The shift fork (38) is mounted and fixed on the shift fork shaft (39). The shift fork shaft (39) is mounted on the track base (4). A rotating handle seat (40) is provided at one end of the shift fork shaft (39). The rotating handle seat (40) is connected to a rotating handle (41). The handle (41) is rotated counterclockwise to drive the shift fork shaft (39) to rotate counterclockwise, thereby driving the shift fork (38) to rotate counterclockwise, driving the coupling (34) to move along the lead screw (33) and then engage with the lead screw gear (32).

7. A special drilling machine for machining the mounting holes of the wear plates of the bogie side frame columns according to claim 1, characterized in that: The gear set (50) comprises a first gear (45), a first worm (46), a first worm wheel (47), a second worm (48), a second worm wheel (49), an intermediate transmission gear, and a drill gear. The first gear (45) is fixedly mounted on the first worm (46). The first worm (46) meshes with the first worm wheel (47). The first worm wheel (47) is fixedly mounted on the second worm (48). The second worm (48) meshes with the second worm wheel (49). The center of the second worm wheel (49) has a through hole with an internal thread. The internal thread of the second worm gear (49) is meshed with the external thread of the screw rod (33). The screw rod (33) rotates to drive the drill box (6) to move along the screw rod (33). The first gear (45) is meshed with the internal spline shaft (44). There are multiple intermediate transmission gears that are meshed in sequence. The intermediate transmission gear at the head is meshed with the internal spline shaft (44). There are four drill gears. The intermediate transmission gear at the tail is meshed with each drill gear. Each drill gear is fixed on a drill gear shaft. A drill bit (7) is installed on each drill gear shaft.

Images