Adjustable multi-hole drilling device and method

Abstract

The invention discloses an adjustable multi-hole drilling device and method, and relates to the technical field of devices for track construction, the adjustable multi-hole drilling device comprises a steel rail, a fixing plate and a manual pressurizing water bucket, and is characterized by further comprising a mounting seat, two guide columns are fixedly mounted on the fixing plate, the mounting seat is slidably mounted between the two guide columns, and the manual pressurizing water bucket is fixedly mounted on the mounting seat; a main shaft and two auxiliary shafts are rotationally mounted on the mounting seat, and a main drill bit is fixedly mounted on the main shaft; comprising the following steps that S1, the device is moved to a steel rail to be drilled, chalk is used for marking the drilling position on the steel rail, and the device is pushed to enable a main drill bit to be aligned with the marked middle hole position on the steel rail; the steel rail drilling device has the beneficial effects that three holes can be drilled in a steel rail at a time, meanwhile, connection between the device and the steel rail is more stable and firmer in the drilling process, resonance force generated by simultaneous drilling of the multiple drill bits is smaller, and the drilling precision can be guaranteed while the drilling efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of track construction devices, and in particular to an adjustable multi-hole drilling device and method. Background Art

[0002] The traction power supply in the subway system generally adopts direct current, which will generate stray current on the locomotive track while supplying power normally. These stray currents will affect the safe operation and service life of subway equipment. Therefore, in order to eliminate the harm of stray current, a stray current discharge device is installed in the traction substation, and stray current plugs need to be installed on the track to introduce the stray current on the locomotive track into the substation's discharge device through a dedicated line. This requires that the installation position of the plugs be determined on site and holes are drilled and installed on site.

[0003] When the existing drilling device is used for drilling, it can only drill a single hole each time, which not only affects the working efficiency, but also cannot guarantee the accuracy of the drilling position when drilling multiple holes. Therefore, some multi-hole drilling devices have appeared on the market, which can drill multiple holes in the rails at the same time. However, when the currently used multi-hole drilling devices are used, since multiple drill bits drill holes in the rails at the same time, the resonance force in the drilling process increases. Under the influence of vibration force, the connection between the drilling device and the rail will become loose, resulting in deviations in the drilling accuracy. Therefore, it is necessary to design an adjustable multi-hole drilling device and method. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an adjustable multi-hole drilling device and method, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An adjustable multi-hole drilling device, comprising a steel rail, a fixing plate and a manual pressurized water bucket, and also comprising:

[0007] A mounting seat, two guide pillars are fixedly installed on the fixing plate, the mounting seat is slidably installed between the two guide pillars, a main shaft and two secondary shafts are rotatably installed on the mounting seat, a main drill bit is fixedly installed on the main shaft, and secondary drill bits are fixedly installed on the two secondary shafts, the main drill bit is 5 cm longer than the secondary drill bit, and a transmission assembly matching the main shaft and the two secondary shafts is installed on the mounting seat;

[0008] A support plate, the support plate is fixedly mounted on the top of the mounting seat, the support plate is fixedly mounted with two pressure rods matching with the rail head, two connecting seats are fixedly mounted on the support plate, and clamps are rotatably mounted on the two connecting seats via a rotating shaft, and clamping wheels for clamping the waist of the rail are rotatably mounted on the bottom of the two clamps via a mounting shaft, and a locking assembly for adjusting the angle of the clamps is mounted on the connecting seat.

[0009] Furthermore, the transmission assembly consists of a connecting shaft 1, two connecting shafts 2, two connecting gears 2 and four connecting gears 1. The connecting shaft 1 and the two connecting shafts 2 are rotatably mounted in a mounting seat. The two connecting gears 2 are respectively fixedly mounted on the two connecting shafts 2, and the two connecting gears 2 are meshed with each other. The main shaft, the connecting shaft 1 and the two secondary shafts are all fixedly mounted with a connecting gear 1. The connecting gear 1 on the main shaft is meshed with the connecting gear 1 on the connecting shaft 1, and the other side of the connecting gear 1 on the connecting shaft 1 is meshed with the connecting gear 1 on the corresponding secondary shaft. The other side of the connecting gear 1 on the main shaft is meshed with the corresponding connecting gear 2, and another connecting gear 2 is meshed with the connecting gear 1 on the corresponding secondary shaft.

[0010] Furthermore, a mounting plate is fixedly mounted on the mounting seat, and a motor is fixedly mounted on the mounting plate, and an output end of the motor is fixedly connected to the main shaft.

[0011] Furthermore, two supporting seats are fixedly installed on one end of the mounting seat away from the fixing plate, and a handrail is fixedly installed between the two supporting seats.

[0012] Furthermore, three through holes are provided on the fixing plate, and the three through holes are respectively matched with the main drill bit and the two auxiliary drill bits. Three water pipe holes are also provided on the fixing plate, and the three water pipe holes are respectively located above the corresponding through holes.

[0013] Furthermore, two top blocks are fixedly mounted on one end of the fixing plate away from the mounting seat, and a plurality of protrusions matching with the rail sides are fixedly mounted on the two top blocks.

[0014] Furthermore, the locking assembly consists of a groove, a round shaft, a connecting block, a screw and an adjusting handle. The groove is opened at the top of the splint, the connecting block is rotatably installed in the groove through the round shaft, the screw is rotatably installed on the connecting seat, and the screw is threadedly connected to the connecting block, and the adjusting handle is fixedly installed on the end of the screw away from the connecting seat.

[0015] Furthermore, the adjustment handle consists of a fixed column, a sliding hole, a sliding rod and two positioning balls. The fixed column is fixedly mounted on the screw rod, the sliding hole is opened on the fixed column, the sliding rod is slidably mounted on the sliding hole, and the two positioning balls are respectively fixedly mounted at both ends of the sliding rod, and the diameter of the positioning ball is larger than the diameter of the sliding hole.

[0016] A method for using an adjustable multi-hole drilling device, using the adjustable multi-hole drilling device, comprises the following steps:

[0017] S1: Move the device to the rail to be drilled, mark the drilling position on the rail with chalk, and push the device so that the main drill bit is aligned with the middle hole position marked on the rail;

[0018] S2: Continue to push the device so that the pressure rod rests on the rail head of the rail, and at the same time, multiple protrusions on the top block are all in contact with the rail side of the rail, and the drilling position of the device is determined at this time;

[0019] S3: Turn the two adjustment handles counterclockwise so that the connection block drives the clamping plate to move away from the connection seat. At this time, the movement of the connection block causes the upper end of the clamping plate to move outward. Through the fulcrum provided by the rotating shaft, the lower end of the clamping plate drives the clamping wheel to fit against the waist of the rail. The device is firmly fixed on the rail through the cooperation of the clamping wheel, the pressure rod and the top block.

[0020] S4: After the device is fixed, the water pipes on the manual pressurized water bucket are connected to the water pipe holes on the fixed plate in sequence, and then the manual pressurized water bucket is manually pressurized so that the water in the manual pressurized water bucket can continuously flow out from the water pipe holes, so as to facilitate cooling of the drilling position of the rail during the drilling process;

[0021] S5: Start the motor, drive the main drill bit to rotate through the main shaft, and at the same time, the two auxiliary drill bits rotate at the same speed under the operation of the transmission assembly. Since the main drill bit and the auxiliary drill bit are 5 cm long, the main drill bit will enter the rail first during the drilling process, and then the two auxiliary drill bits will enter the rail. This design can prevent resonance when drilling three holes at the same time and improve the stability during drilling;

[0022] S6: During the drilling process, the staff holds the two ends of the handrail with both hands and pushes the handrail according to the drilling progress, so that the main drill bit and the two auxiliary drill bits complete the drilling process of the rail in sequence. After the drilling process is completed, the handrail is pulled outward to separate the main drill bit and the two auxiliary drill bits from the rail, and then the two adjustment handles are turned clockwise so that the clamping plate drives the clamping wheel to separate from the waist of the rail, and then the device can be removed from the rail.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1: Through the design of the main drill bit and two auxiliary drill bits, three holes can be drilled on the rail at a time, and the spacing between the multiple holes is constant, which ensures the accuracy of the multiple holes and greatly improves the drilling efficiency. The design of the length difference between the main drill bit and the two auxiliary drill bits can avoid the problem of excessive resonance force affecting stability caused by drilling multiple holes at the same time, further improving the drilling accuracy.

[0025] 2: Through the design of the transmission assembly, the two secondary shafts can rotate in opposite directions at the same time. Therefore, when drilling multiple holes, the tangential forces exerted by the two secondary drill bits on the rails can offset each other, which can further reduce the impact of the resonance force during the multiple hole drilling process.

[0026] 3: Through the design of the pressure rod, clamping plate and clamping wheel, the device can be firmly fixed on the rail before drilling, and ensure that the drill bit and the position to be drilled on the rail are on the same horizontal plane, further improving the drilling stability and avoiding the problem of up and down deviation of the drilling position.

[0027] In summary, the present invention can perform three holes drilling processing on the rail at a time. At the same time, the connection between the device and the rail during the drilling process is more stable and reliable, and the resonance force generated by multiple drill bits drilling at the same time is smaller, which can greatly improve the drilling efficiency while ensuring the drilling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of an adjustable multi-hole drilling device proposed by the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure after removing the rails;

[0031] Figure 4 for Figure 2 A schematic diagram of the structure at the middle mounting seat;

[0032] Figure 5 for Figure 2 Schematic diagram of the structure at the middle fixed plate;

[0033] Figure 6 for Figure 4 Schematic diagram of the internal structure of the middle mounting seat;

[0034] Figure 7 for Figure 3 Structural diagram of the middle fixed plate;

[0035] Figure 8 for Figure 5 An enlarged schematic diagram of the structure of the middle connecting seat and the clamping plate;

[0036] Fig. 9 for Figure 8 A schematic diagram of the structure of the middle splint from another perspective;

[0037] Fig.10 for Figure 8 Schematic diagram of the structure of the middle connecting seat from another perspective.

[0038] In the figure: 1. rail; 2. fixing plate; 3. mounting seat; 4. guide column; 5. main shaft; 6. secondary shaft; 7. main drill bit; 8. secondary drill bit; 9. through hole; 10. mounting plate; 11. motor; 12. connecting shaft 1; 13. connecting shaft 2; 14. connecting gear 1; 15. connecting gear 2; 16. supporting seat; 17. handrail; 18. water pipe hole; 19. supporting plate; 20. top block; 21. pressure rod; 22. connecting seat; 23. rotating shaft; 24. clamping plate; 25. clamping wheel; 26. groove; 27. round shaft; 28. connecting block; 29. ​​screw; 30. adjusting handle. DETAILED DESCRIPTION

[0039] Reference Figure 1-Figure 10 An adjustable multi-hole drilling device includes a rail 1, a fixing plate 2 and a manual pressurized water bucket. The manual pressurized water bucket is an existing product. The principle of a barreled water hand-pressure water pump can be referred to. When the air bag is pressed downward, the air in the air bag is pressed out and enters the barrel. At this time, there is almost no air in the air bag, and the pressure in the air bag is very small. When the hand is released, the pressure in the barrel is greater than the pressure in the air bag. During the release process, the air pressure presses the water into the air bag, and the water then flows out through an external water outlet pipe. The manual pressurized water bucket can also refer to the principle of a pressurized watering can.

[0040] The mounting base 3 is also included. Two guide columns 4 are fixedly installed on the fixing plate 2. The mounting base 3 is slidably installed between the two guide columns 4. Under the design of the two guide columns 4, the mounting base 3 can slide along the guide columns 4 relative to the fixing plate 2 to complete the adjustment of the distance between the two. A main shaft 5 and two secondary shafts 6 are rotatably installed on the mounting base 3. A main drill bit 7 is fixedly installed on the main shaft 5. Secondary drill bits 8 are fixedly installed on the two secondary shafts 6. Three through holes 9 are opened on the fixing plate 2, and the three through holes 9 are respectively connected to the main drill bit 7 and the two secondary shafts 6. The main drill bit 7 is coordinated with two auxiliary drill bits 8, and the main drill bit 7 is in the middle of the two auxiliary drill bits 8. When drilling the rail 1, the main drill bit 7 and the two auxiliary drill bits 8 are rotated at the same time, and the mounting seat 3 is pushed to make it close to the rail 1. Then, three holes can be drilled on the rail 1 at a time under the action of the driving force and the rotational force. Compared with the traditional working method of drilling one hole each time, the working efficiency is greatly improved, and because the spacing between the two auxiliary drill bits 8 and the main drill bit 7 remains unchanged, the accuracy and spacing of the three holes can be guaranteed, thereby improving the multi-hole drilling effect.

[0041] The length of the main drill bit 7 is 5 cm longer than that of the auxiliary drill bit 8. The advantage of the length design here is that when performing multi-hole drilling on the rail 1, the main drill bit 7 first contacts the rail 1 and drills into the rail 1, and then the two auxiliary drill bits 8 contact the rail 1 and drill. Since the two auxiliary drill bits 8 are respectively located on both sides of the main drill bit 7, and the main drill bit 7 is already located in the rail 1, a mutually balanced state is formed between the three, which can reduce the resonance force in the multi-hole drilling process, thereby ensuring the drilling accuracy during the multi-hole drilling process.

[0042] A transmission assembly matched with the main shaft 5 and the two secondary shafts 6 is installed on the mounting seat 3, and the transmission assembly consists of a connecting shaft 12, two connecting shafts 13, two connecting gears 2 15 and four connecting gears 14. The connecting shaft 12 and the two connecting shafts 13 are rotatably mounted in the mounting seat 3, and the two connecting gears 2 15 are fixedly mounted on the two connecting shafts 2 13, respectively, and the two connecting gears 2 15 are meshed with each other. The main shaft 5, the connecting shaft 12 and the two secondary shafts 6 are all fixedly mounted with a connecting gear 14. The connecting gear 14 on the main shaft 5 is meshed with the connecting gear 14 on the connecting shaft 12, and the other side of the connecting gear 14 on the connecting shaft 12 is meshed with the corresponding connecting gear 14 on the secondary shaft 6, the other side of the connecting gear 14 on the main shaft 5 is meshed with the corresponding connecting gear 2 15, and another connecting gear 2 15 is meshed with the connecting gear 14 on the corresponding secondary shaft 6, refer to Figure 6 When the main shaft 5 rotates clockwise, the meshing effect of the connecting gear 14 on it and the connecting gear 2 15 on the left and the connecting gear 1 14 on the right makes the connecting shaft 12 and the connecting shaft 2 13 close to the main shaft 5 rotate counterclockwise at the same time. At this time, the meshing effect of the connecting gear 14 on the connecting shaft 12 and the connecting gear 14 on the right side of the secondary shaft 6 drives the secondary shaft 6 to rotate clockwise at the same speed as the main shaft 5. The meshing effect of the two connecting gears 2 15 makes the other connecting shaft 2 13 rotate clockwise, thereby driving the secondary shaft 6 on the left to rotate counterclockwise at the same time. Therefore, the two secondary shafts 6 rotate in opposite directions, and the tangential forces exerted by the two on the rail 1 offset each other, which can further improve the stability during the multi-hole drilling process.

[0043] A mounting plate 10 is fixedly mounted on the mounting seat 3, and a motor 11 is fixedly mounted on the mounting plate 10. The output end of the motor 11 is fixedly connected to the main shaft 5. The motor 11 can specifically adopt a motor that is commonly used in daily life and work and can only rotate in one direction. Three water pipe holes 18 are also opened on the fixed plate 2, and the three water pipe holes 18 are respectively located above the corresponding through holes 9. The water pipe holes 18 are used to connect with the water outlet pipe of a manual pressurized water bucket during the drilling process, and the outflowing water is used to cool the working position of the rail 1.

[0044] Two support seats 16 are fixedly installed on one end of the mounting seat 3 away from the fixed plate 2, and an armrest 17 is fixedly installed between the two support seats 16. The design of the armrest 17 facilitates the stability of the device during the drilling process, and also facilitates the pushing of the mounting seat 3 during drilling to complete the feeding operation of the main drill bit 7 and the two auxiliary drill bits 8.

[0045] A support plate 19 is fixedly mounted on the top of the mounting seat 3. The support plate 19 is fixedly mounted with two pressure rods 21 that match the rail head of the rail 1. Through the design of the two pressure rods 21, the connection horizontal line between the device and the rail 1 can be ensured when the device is connected and fixed to the rail 1, thereby ensuring that the main drill bit 7 and the auxiliary drill bit 8 are on the same horizontal line, avoiding upper and lower position deviations of multiple holes. Two top blocks 20 are fixedly mounted on one end of the fixing plate 2 away from the mounting seat 3, and a plurality of protrusions that match the rail side of the rail 1 are fixedly mounted on the two top blocks 20. Through the design of the protrusions, the distance between the fixing plate 2 and the rail 1 can be limited.

[0046] Two connecting seats 22 are fixedly installed on the support plate 19, and the two connecting seats 22 are rotatably installed with clamping plates 24 through rotating shafts 23. The bottoms of the two clamping plates 24 are rotatably installed with clamping wheels 25 for clamping the waist of the rail 1 through the mounting shafts. A locking assembly for adjusting the angle of the clamping plates 24 is installed on the connecting seat 22. The locking assembly consists of a groove 26, a round shaft 27, a connecting block 28, a screw 29 and an adjusting handle 30. The groove 26 is opened at the top of the clamping plate 24, the connecting block 28 is rotatably installed in the groove 26 through the round shaft 27, the screw 29 is rotatably installed on the connecting seat 22, and the screw 29 is threadedly connected to the connecting block 28. The adjusting handle 30 is fixedly installed on the screw 29 away from the connecting seat When the screw rod 29 is rotated at one end of the clamping plate 22, the movement of the connecting block 28 can drive the upper end of the clamping plate 24 to move forward and backward relative to the rail 1, and then under the support of the rotating shaft 23, the spacing of the clamping wheel 25 at the lower end of the clamping plate 24 relative to the waist of the rail 1 is controlled. When the upper end of the clamping plate 24 moves outward, the clamping wheel 25 can be closely attached to the waist of the rail 1. At this time, the clamping wheel 25 applies a lateral thrust to the waist of the rail, and the pressure rod 21 applies downward pressure to the rail head, and the protrusion applies a lateral thrust to the rail side in the opposite direction to the direction of the clamping wheel 25. Under the action of forces in different directions, the fixing effect between the device and the rail 1 can be effectively guaranteed. At the same time, when the clamping wheel 25 contacts and presses the waist of the rail, the probability of causing damage to the waist of the rail can be reduced.

[0047] The adjustment handle 30 consists of a fixed column, a sliding hole, a sliding rod and two positioning balls. The fixed column is fixedly installed on the screw rod 29, the sliding hole is opened on the fixed column, the sliding rod is slidably installed on the sliding hole, and the two positioning balls are fixedly installed at both ends of the sliding rod, and the diameter of the positioning balls is larger than the diameter of the sliding hole.

[0048] In the present invention, a method for using an adjustable multi-hole drilling device comprises the following steps:

[0049] S1: Move the device to the rail 1 to be drilled, mark the drilling position on the rail 1 with chalk, and push the device so that the main drill bit 7 is aligned with the middle hole position marked on the rail 1;

[0050] S2: Continue to push the device so that the pressure rod 21 rests on the rail head of the rail 1, and at the same time, multiple protrusions on the top block 20 are all in contact with the rail side of the rail 1, and the drilling position of the device is determined at this time;

[0051] S3: Rotate the two adjustment handles 30 counterclockwise, so that the connection block 28 drives the clamping plate 24 to move away from the connection seat 22. At this time, the movement of the connection block 28 causes the upper end of the clamping plate 24 to move outward, and through the fulcrum provided by the rotating shaft 23, the lower end of the clamping plate 24 drives the clamping wheel 25 to fit the waist of the rail 1. The device is firmly fixed on the rail 1 through the cooperation of the clamping wheel 25, the pressure rod 21 and the top block 20.

[0052] S4: After the device is fixed, the water pipes on the manual pressurized water bucket are sequentially connected to the water pipe holes 18 on the fixing plate 2, and then the manual pressurized water bucket is manually pressurized so that the water in the manual pressurized water bucket can continuously flow out from the water pipe holes 18, so as to facilitate cooling of the drilling position of the rail 1 during the drilling process;

[0053] S5: Start the motor 11, drive the main drill bit 7 to rotate through the main shaft 5, and at the same time, the two auxiliary drill bits 8 rotate at the same speed under the operation of the transmission assembly. Since the main drill bit 7 and the auxiliary drill bit 8 are 5 cm long, the main drill bit 7 will enter the rail 1 first during the drilling process, and then the two auxiliary drill bits 8 will enter the rail 1. This design can prevent resonance when three holes are drilled at the same time, and improve the stability during drilling;

[0054] S6: During the drilling process, the staff holds the two ends of the handrail 17 with both hands respectively, and pushes the handrail 17 according to the drilling progress, so that the main drill bit 7 and the two auxiliary drill bits 8 complete the drilling process of the rail 1 in sequence. After the drilling process is completed, the handrail 17 is pulled outward to separate the main drill bit 7 and the two auxiliary drill bits 8 from the rail 1, and then the two adjustment handles 30 are rotated clockwise so that the clamping plate 24 drives the clamping wheel 25 to separate from the waist of the rail 1, and then the device can be removed from the rail 1.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and 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, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An adjustable multi-hole drilling device, comprising a rail (1), a fixing plate (2) and a manual pressurized water bucket, characterized in that: Also includes: A mounting seat (3), two guide pillars (4) are fixedly mounted on the fixing plate (2), the mounting seat (3) is slidably mounted between the two guide pillars (4), a main shaft (5) and two secondary shafts (6) are rotatably mounted on the mounting seat (3), a main drill bit (7) is fixedly mounted on the main shaft (5), and secondary drill bits (8) are fixedly mounted on the two secondary shafts (6), the main drill bit (7) is 5 cm longer than the secondary drill bit (8), and a transmission assembly matched with the main shaft (5) and the two secondary shafts (6) is mounted on the mounting seat (3); A support plate (19), wherein the support plate (19) is fixedly mounted on the top of a mounting seat (3), and two pressure rods (21) matched with the rail head of the steel rail (1) are fixedly mounted on the support plate (19), and two connecting seats (22) are fixedly mounted on the support plate (19), and clamping plates (24) are rotatably mounted on the two connecting seats (22) via a rotating shaft (23), and clamping wheels (25) for clamping the waist of the steel rail (1) are rotatably mounted on the bottom of the two clamping plates (24) via a mounting shaft, and a locking assembly for adjusting the angle of the clamping plates (24) is mounted on the connecting seat (22).

2. The adjustable multi-hole drilling device according to claim 1, characterized in that: The transmission assembly is composed of a connecting shaft 1 (12), two connecting shafts 2 (13), two connecting gears 2 (15) and four connecting gears 1 (14). The connecting shaft 1 (12) and the two connecting shafts 2 (13) are rotatably mounted in the mounting seat (3). The two connecting gears 2 (15) are respectively fixedly mounted on the two connecting shafts 2 (13), and the two connecting gears 2 (15) are meshed with each other. The main shaft (5), the connecting shaft 1 (12) and the two secondary shafts (6) are all fixedly mounted with connecting gears 1 (14). The connecting gear 1 (14) on the main shaft (5) is meshed with the connecting gear 1 (14) on the connecting shaft 1 (12), and the other side of the connecting gear 1 (14) on the connecting shaft 1 (12) is meshed with the connecting gear 1 (14) on the corresponding secondary shaft (6), the other side of the connecting gear 1 (14) on the main shaft (5) is meshed with the corresponding connecting gear 2 (15), and the other connecting gear 2 (15) is meshed with the connecting gear 1 (14) on the corresponding secondary shaft (6).

3. The adjustable multi-hole drilling device according to claim 2, characterized in that: A mounting plate (10) is fixedly mounted on the mounting seat (3), and a motor (11) is fixedly mounted on the mounting plate (10); the output end of the motor (11) is fixedly connected to the main shaft (5).

4. The adjustable multi-hole drilling device according to claim 3, characterized in that: Two support seats (16) are fixedly mounted on one end of the mounting seat (3) away from the fixing plate (2), and a handrail (17) is fixedly mounted between the two support seats (16).

5. The adjustable multi-hole drilling device according to claim 4, characterized in that: The fixing plate (2) is provided with three through holes (9), and the three through holes (9) are respectively matched with the main drill bit (7) and the two auxiliary drill bits (8); the fixing plate (2) is also provided with three water pipe holes (18), and the three water pipe holes (18) are respectively located above the corresponding through holes (9).

6. The adjustable multi-hole drilling device according to claim 5, characterized in that: Two top blocks (20) are fixedly mounted on one end of the fixing plate (2) away from the mounting seat (3), and a plurality of protrusions matching the rail side of the steel rail (1) are fixedly mounted on the two top blocks (20).

7. The adjustable multi-hole drilling device according to claim 6, characterized in that: The locking assembly consists of a groove (26), a round shaft (27), a connecting block (28), a screw (29) and an adjusting handle (30), wherein the groove (26) is provided at the top of the clamping plate (24), the connecting block (28) is rotatably mounted in the groove (26) via the round shaft (27), the screw (29) is rotatably mounted on the connecting seat (22), and the screw (29) is threadedly connected to the connecting block (28), and the adjusting handle (30) is fixedly mounted on one end of the screw (29) away from the connecting seat (22).

8. The adjustable multi-hole drilling device according to claim 7, characterized in that: The adjustment handle (30) is composed of a fixed column, a sliding hole, a sliding rod and two positioning balls. The fixed column is fixedly mounted on the screw rod (29). The sliding hole is opened on the fixed column. The sliding rod is slidably mounted on the sliding hole. The two positioning balls are respectively fixedly mounted at both ends of the sliding rod, and the diameter of the positioning balls is larger than the diameter of the sliding hole.

9. A method for using an adjustable multi-hole drilling device, using the adjustable multi-hole drilling device as claimed in claim 8, characterized in that: The following steps are involved: S1: Move the device to the steel rail (1) to be drilled, mark the drilling position on the steel rail (1) with chalk, and push the device so that the main drill bit (7) is aligned with the middle hole position marked on the steel rail (1); S2: Continue to push the device so that the pressure rod (21) rests on the rail head of the steel rail (1), and at the same time, multiple protrusions on the top block (20) are all in contact with the rail side of the steel rail (1), and at this time, the drilling position of the device is determined; S3: The two adjustment handles (30) are rotated counterclockwise, so that the connection block (28) drives the clamping plate (24) to move away from the connection seat (22). At this time, the movement of the connection block (28) causes the upper end of the clamping plate (24) to move outward, and through the fulcrum provided by the rotating shaft (23), the lower end of the clamping plate (24) drives the clamping wheel (25) to fit the waist of the rail (1). The device is firmly fixed on the rail (1) through the cooperation of the clamping wheel (25), the pressure rod (21) and the top block (20); S4: After the device is fixed, the water pipes on the manual pressurized water bucket are sequentially connected to the water pipe holes (18) on the fixing plate (2), and then the manual pressurized water bucket is manually pressurized so that the water in the manual pressurized water bucket can continuously flow out of the water pipe holes (18), thereby facilitating cooling of the drilling position of the rail (1) during the drilling process; S5: Start the motor (11), drive the main drill bit (7) to rotate through the main shaft (5), and at the same time, the two auxiliary drill bits (8) rotate at the same speed under the operation of the transmission component. Since the main drill bit (7) and the auxiliary drill bit (8) are 5 cm long, during the drilling process, the main drill bit (7) will enter the rail (1) first, and then the two auxiliary drill bits (8) will enter the rail (1). This design can prevent resonance when three holes are drilled at the same time, thereby improving the stability during drilling; S6: During the drilling process, the worker holds the two ends of the handrail (17) with both hands respectively, and pushes the handrail (17) according to the drilling progress, so that the main drill bit (7) and the two auxiliary drill bits (8) complete the drilling process of the rail (1) in sequence. After the drilling process is completed, the handrail (17) is pulled outward to separate the main drill bit (7) and the two auxiliary drill bits (8) from the rail (1), and then the two adjustment handles (30) are rotated clockwise to make the clamping plate (24) drive the clamping wheel (25) to separate from the rail waist of the rail (1), and then the device can be removed from the rail (1).

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