A precise drilling machine for counterweight plates and its drilling process

Abstract

The present invention relates to a precise drilling machine for counterweight sheets and its drilling process, belonging to the field of counterweight sheet drilling. It includes a frame, on which a workbench is arranged. Drilling mechanisms are symmetrically arranged on both sides of the workbench on the frame. A positioning mechanism is arranged inside the workbench. The positioning mechanism includes a placement plate vertically slidably connected inside the workbench. A baffle is arranged on the top of the workbench. The placement plate presses the counterweight sheet against the baffle to limit the placement plate in the vertical direction. Limiting components one and two for limiting both ends of the counterweight sheet are respectively arranged at both ends of the placement plate. The present invention has the effect of facilitating the accurate positioning of the counterweight sheet and ensuring more accurate positions when drilling installation holes from both sides.

Description

Technical Field

[0001] The present invention relates to the field of counterweight sheet processing, and in particular to a precise drilling machine for counterweight sheets and its drilling process. Background Art

[0002] A counterweight is a heavy object used to increase its own weight to maintain balance. Counterweight iron is a process of melting metal into a liquid that meets certain requirements and pouring it into a mold, and after cooling and solidifying, finishing treatment to obtain a casting with a predetermined shape, size, and performance.

[0003] Counterweight sheets are widely used in fitness equipment. The weight of existing fitness equipment counterweight sheets mainly comes from steel or cast iron. Before installing the counterweight sheet on the fitness equipment, holes need to be drilled in the counterweight sheet.

[0004] A counterweight sheet, see Figure 1 , a guiding hole 41 is provided in the middle of the counterweight sheet 4, and the guiding hole 41 is used for the guiding column 34 to penetrate. Mounting holes 42 are provided on both perpendicular sides of the counterweight sheet 4, and the axial direction of the mounting hole 42 is perpendicular to the axial direction of the guiding hole 41, and the mounting hole 42 penetrates the counterweight sheet 4 and is communicated with the guiding hole 41. When drilling, it is necessary to drill the guiding hole 41 on both sides of the counterweight sheet 4 simultaneously. Therefore, a drilling machine for positioning the counterweight sheet 4 to ensure the precise docking of the mounting holes 42 on both sides is an urgent problem to be solved. Summary of the Invention

[0005] In order to facilitate the accurate positioning of the counterweight sheet and ensure more accurate positions when drilling the mounting holes from both sides, the present invention provides a precise drilling machine for counterweight sheets.

[0006] The precise drilling machine for counterweight sheets provided by the present invention adopts the following technical solutions:

[0007] A precise drilling machine for counterweight sheets includes a frame, a workbench is arranged on the frame, drilling mechanisms are symmetrically arranged on both sides of the workbench on the frame, a positioning mechanism is arranged in the workbench, the positioning mechanism includes a placement board vertically slidably connected in the workbench, a baffle is arranged on the top of the workbench, and the placement board presses the counterweight sheet against the baffle to limit the placement board in the vertical direction. Limiting components one and two for limiting both ends of the counterweight sheet are respectively arranged at both ends of the placement board.

[0008] By adopting the above technical solutions, the counterweight sheet is placed on the placement board, the limiting components one and two limit both ends of the counterweight sheet, and the placement board moves upward to press the counterweight sheet and the baffle tightly, thereby fixing the placement board in the horizontal and vertical directions. The drilling mechanisms drill both sides of the placement board simultaneously, so as to achieve the effect of accurately positioning the counterweight sheet and ensuring more accurate positions when drilling the mounting holes from both sides.

[0009] Optionally, a hydraulic cylinder is vertically arranged on the workbench, the end of the piston rod of the hydraulic cylinder is fixedly connected to the bottom of the placement plate, a guide post is fixedly connected to the placement plate, the axial direction of the guide post is vertically arranged and is slidably connected to the baffle plate.

[0010] By adopting the above technical solution, when the piston rod of the hydraulic cylinder extends or retracts, it drives the placement plate to move vertically, which is convenient for driving the counterweight sheet to move vertically. The guide post slides vertically in the baffle plate, making the placement plate more stable during the vertical movement.

[0011] Optionally, the drilling mechanism includes a positioning seat slidably connected to the frame, a driving motor is fixedly connected to the top of the positioning seat, the output shafts of the driving motors are arranged towards each other, and drill bits are fixedly connected to the output shafts of the driving motors.

[0012] By adopting the above technical solution, when drilling the counterweight sheet, the positioning seats move towards each other, making the drill bits move towards the counterweight sheet. The driving motor drives the drill bits to move, and the drill bits drill the counterweight sheet.

[0013] Optionally, the first limiting component includes a fixing plate fixedly connected to the placement plate, a limiting post is threadedly connected to the fixing plate, and the limiting post is used to abut against the end of the counterweight sheet.

[0014] By adopting the above technical solution, the limiting post is used to abut against the end of the counterweight sheet to limit the end of the counterweight sheet. The limiting post is threadedly connected, which is convenient for adjusting the position of the limiting post and can limit counterweight sheets of different sizes.

[0015] Optionally, the second limiting component includes a positioning frame fixedly connected to the placement plate, a connecting plate is connected to the positioning frame, limiting rods are fixedly connected to both sides of the connecting plate, sliding grooves are formed on the opposite sides of the limiting rods, a limiting plate is horizontally slidably connected in the sliding grooves, and a driving component for driving the limiting plate to abut against the end of the counterweight sheet is connected to the connecting plate.

[0016] By adopting the above technical solution, the driving component drives the limiting plate to move towards the placement plate, and the limiting plate abuts against the end of the counterweight sheet, which is convenient for clamping the counterweight sheet between the limiting post and the limiting plate, and preventing the position of the counterweight sheet from shaking during the vertical movement of the placement plate.

[0017] Optionally, the driving component includes a cylinder hinged to the connecting plate, the end of the piston rod of the cylinder is hinged to a connecting column, a first connecting rod and a second connecting rod are respectively hinged to both ends of the connecting column, the ends of the first connecting rod and the second connecting rod far from the connecting column are hinged to the limiting plate, a third connecting rod and a fourth connecting rod are respectively hinged to the positions of the connecting column close to the first connecting rod and the second connecting rod, and the ends of the third connecting rod and the fourth connecting rod far from the connecting column are hinged to the connecting plate.

[0018] By adopting the above technical solution, the piston rod of the cylinder extends, pushing the first connecting rod and the second connecting rod towards the placing plate, and at the same time pushing the limiting plate upwards onto the placing plate and abutting against the counterweight sheet, so that the counterweight sheet can be abutted between the limiting plate and the limiting column, and the counterweight plate is automatically fixed.

[0019] Optionally, a guide rod is slidably connected to the positioning frame. A sliding groove for the guide rod to pass through is formed on the positioning frame. The guide rod is slidably connected in the sliding groove of the positioning frame. A bolt for fixing the guide rod to the positioning frame is threadedly connected to the positioning frame. The connecting plate is fixedly connected to the guide rod.

[0020] By adopting the above technical solution, loosening the bolt can adjust the position of the guide rod, and then facilitate adjusting the position of the limiting plate on the placing plate, and can position counterweight sheets of different sizes.

[0021] Optionally, an adjusting plate is arranged at the bottom of the baffle. The adjusting plate is horizontally arranged. A screw rod is rotatably connected to the adjusting plate. The screw rod is threadedly connected to the baffle.

[0022] By adopting the above technical solution, rotating the screw rod can push the adjusting plate to move vertically, facilitating the adjusting plate to abut against the top of the counterweight sheet, and ensuring that the drilling position of the counterweight sheet is at the same height as the drill bit.

[0023] Optionally, guide plates are fixedly connected to the two symmetrical sides of the baffle. Through holes are formed in the guide plates for the drill bit to pass through. After the drill bit passes through the through holes, holes are drilled in the counterweight sheet. A blanking hole is formed at the position corresponding to the guide plate on the top of the support plate. The blanking hole is communicated with the inside of the guide plate. A feed pipe is inserted into the top of the support plate at the position of the blanking hole. One end of the feed pipe far from the blanking hole is connected to an external coolant source.

[0024] By adopting the above technical solution, the feed pipe reversely flows the coolant into the blanking hole, and the coolant source in the blanking hole flows onto the drill bit to cool and lower the temperature of the drill bit, improving the service life of the drill bit.

[0025] In order to facilitate the accurate positioning of the counterweight sheet and ensure more accurate positions when drilling installation holes from both sides, the present invention provides a drilling process for a precise drilling machine for counterweight sheets.

[0026] A drilling process for a precise drilling machine for counterweight sheets includes the following steps:

[0027] S1. Debug the drilling machine: Adjust the positions of the limiting column and the limiting plate according to the size of the counterweight sheet to ensure that the counterweight sheet can be clamped between the limiting plate and the limiting column. At the same time, adjust the position of the adjusting plate according to the thickness of the counterweight sheet to ensure that the drilling position of the counterweight sheet is at the same height as the drill bit;

[0028] S2. Position the counterweight piece: Extend the piston rod of the control cylinder. Move away from the placement board through Link 1 and Link 2, which facilitates placing the counterweight piece on the placement board. Extend the piston rod of the cylinder, and push the limit plate towards the counterweight piece and abut against the end of the counterweight piece, then the counterweight piece can be fixedly connected to the placement board.

[0029] S3. Drill holes: Extend the piston rod of the hydraulic cylinder, push the placement board upward and abut against the adjustment board, so that the position where the counterweight piece is drilled is at the same height as the drill bit; Drive the drill bit to move by the drive motor, and drill holes on both sides of the counterweight piece.

[0030] S4. Discharge: Retract the piston rod of the hydraulic cylinder, drive the placement board to move downward, retract the piston rod of the control cylinder, and move away from the placement board through Link 1 and Link 2, which facilitates taking out the counterweight piece from the placement board.

[0031] By adopting the above technical solutions, adjust the positions of the limit posts and the limit plate according to the size of the counterweight piece to ensure that the counterweight piece can be clamped between the limit plate and the limit posts, adjust the position of the adjustment board according to the thickness of the counterweight piece to ensure that the position where the counterweight piece is drilled is at the same height as the drill bit; Retract the piston rod of the control cylinder, move away from the placement board through Link 1 and Link 2, which facilitates placing the counterweight piece on the placement board. Extend the piston rod of the cylinder, push the limit plate towards the counterweight piece and abut against the end of the counterweight piece, then the counterweight piece can be fixedly connected to the placement board; Then, extend the piston rod of the hydraulic cylinder, push the limit plate upward and abut against the adjustment board; Finally, the drill bits move towards each other, and at the same time, drive the drill bits to move by the drive motor, and drill holes on both sides of the counterweight piece. Description of the Drawings

[0032] Figure 1 is a schematic structural view of the counterweight piece in the background art.

[0033] Figure 2 is a schematic view of the overall structure of the embodiment of the present application.

[0034] Figure 3 is an exploded view for highlighting the workbench and the positioning mechanism.

[0035] Figure 4 is a schematic view of the overall structure of the positioning mechanism.

[0036] Figure 5 is a schematic view of the overall structure for highlighting the second limit component.

[0037] Description of the reference numerals: 1. Frame; 11. Workbench; 111. Support plate; 112. Baffle; 113. Material discharging hole; 14. Feed pipe; 15. Guide plate; 151. Through hole; 16. Adjusting plate; 161. Screw rod; 17. Material receiving groove; 2. Drilling mechanism; 21. Positioning seat; 22. Driving motor; 23. Drill bit; 3. Positioning mechanism; 31. Positioning plate; 32. Hydraulic cylinder; 33. Object placing plate; 34. Guide post; 35. Limiting component I; 351. Fixed plate; 352. Limiting post; 36. Limiting component II; 361. Positioning frame; 3611. Sliding groove; 362. Guide rod; 363. Connecting plate; 364. Limiting rod; 3641. Sliding groove; 365. Cylinder; 3651. Connecting column; 366. Link I; 367. Link II; 368. Link III; 369. Link IV; 370. Limiting plate; 4. Counterweight piece; 41. Guide hole; 42. Mounting hole. Detailed implementation manners

[0038] The following is a further detailed description of the present invention in conjunction with the attached Figure 2-5 drawings.

[0039] An embodiment of the present invention discloses a precise drilling machine for counterweight pieces. Refer to Figure 2 FIG., a precise drilling machine for a counterweight piece 4 includes a frame 1, a workbench 11 is arranged in the middle of the frame 1, drilling mechanisms 2 are symmetrically arranged on both sides of the workbench 11, and a positioning mechanism 3 is vertically slidably connected in the workbench 11, and the positioning mechanism 3 is used for fixing the counterweight piece 4.

[0040] The drilling mechanism 2 includes a positioning seat 21 slidably connected to the frame 1, a driving motor 22 is fixedly connected to the top of the positioning seat 21, the output shafts of the driving motors 22 are arranged towards each other, and a drill bit 23 is fixedly connected to the output shafts of the driving motors 22. The drill bits 23 on both sides are arranged opposite to each other for simultaneously drilling both sides of the counterweight piece 4.

[0041] Refer to Figure 2 and Figure 3, the workbench 11 includes four vertically arranged support plates 111. A baffle 112 is bolted to the top of the support plates 111, and the baffle 112 is horizontally arranged. Guide plates 15 are fixedly connected to the two symmetrical sides of the baffle 112. Through holes 151 are formed in the guide plates 15 for the drill bit 23 to pass through. After the drill bit 23 passes through the through holes 151, it drills holes in the counterweight piece 4. A material discharge hole 113 is formed in the top of the support plate 111 corresponding to the position of the guide plate 15. The material discharge hole 113 is communicated with the inside of the guide plate 15. A feed pipe 14 is inserted into the top of the support plate 111 at the position of the material discharge hole 113. One end of the feed pipe 14 away from the material discharge hole 113 is connected to an external coolant source. The feed pipe 14 reversely flows the coolant into the material discharge hole 113. The coolant source in the material discharge hole 113 flows onto the drill bit 23 to cool and lower the temperature of the drill bit 23, improving the service life of the drill bit 23. An adjusting plate 16 is arranged at the bottom of the baffle 112. The adjusting plate 16 is horizontally arranged. A screw rod 161 is rotatably connected to the adjusting plate 16, and the screw rod 161 is threadedly connected to the baffle 112. By rotating the screw rod 161, the adjusting plate 16 can be pushed to move vertically, facilitating the adjusting plate 16 to abut against the top of the counterweight piece 4 to ensure that the drilling position of the counterweight piece 4 is at the same height as the drill bit 23. A receiving groove 17 is arranged on the frame 1. The receiving groove 17 is located below the workbench 11 and is used to receive the debris generated by drilling, facilitating the collection of the debris.

[0042] Referring to Figure 3 and Figure 4 , the positioning mechanism 3 includes a positioning plate 31 fixedly connected to the support plate 111. The positioning plate 31 is fixedly connected to the four support plates 111 and is horizontally arranged. A hydraulic cylinder 32 is vertically arranged on the positioning plate 31. The cylinder body of the hydraulic cylinder 32 is fixedly connected to the positioning plate 31. The end of the piston rod of the hydraulic cylinder 32 extends out of the positioning plate 31 and is fixedly connected to a placement plate 33. The placement plate 33 is used to place the counterweight piece 4. Four guide posts 34 are fixedly connected to the placement plate 33. The axial direction of the guide posts 34 is vertically arranged and is slidably connected to the baffle 112.

[0043] Limiting components one 35 and two 36 for limiting the two ends of the counterweight piece 4 are respectively arranged at the two ends of the placement plate 33. The limiting component one 35 includes an L-shaped fixed plate 351 fixedly connected to the placement plate 33. A limiting post 352 is threadedly connected to the fixed plate 351. The limiting post 352 has threads, and the axial direction of the limiting post 352 is horizontally arranged. The end of the limiting post 352 extends onto the placement plate 33 and is used to abut against the end of the counterweight piece 4.

[0044] The second limiting component 36 includes a positioning frame 361 fixedly connected to the storage plate 33. A guide rod 362 is slidably connected to the positioning frame 361. A sliding groove 3611 for the guide rod 362 to pass through is formed on the positioning frame 361. The guide rod 362 is slidably connected within the sliding groove 3611 of the positioning frame 361. A bolt is threadedly connected to the positioning frame 361, and the bolt is used to fix the guide rod 362 to the positioning frame 361. One end of the guide rod 362 close to the storage plate 33 is fixedly connected with a connecting plate 363. The connecting plate 363 is vertically arranged. Limiting rods 364 are fixedly connected to both sides of the connecting plate 363. A sliding groove 3641 is formed on the opposite side of the limiting rods 364. A limiting plate 370 is horizontally slidably connected within the sliding groove 3641. The limiting plate 370 is used to abut against the end of the counterweight piece 4. A cylinder 365 is hinged to the connecting plate 363. The cylinder body of the cylinder 365 is hinged to the connecting plate 363. The end of the piston rod of the cylinder 365 is hinged to a connecting column 3651. A first connecting rod 366 and a second connecting rod 367 are respectively hinged to both ends of the connecting column 3651. The ends of the first connecting rod 366 and the second connecting rod 367 far from the connecting column 3651 are hinged to the limiting plate 370. Connecting rods 368 and 369 are respectively hinged to the positions of the connecting column 3651 close to the first connecting rod 366 and the second connecting rod 367. The ends of the connecting rods 368 and 369 far from the connecting column 3651 are hinged to the connecting plate 363. When the piston rod of the cylinder 365 extends, it pushes the first connecting rod 366 and the second connecting rod 367 to move towards the storage plate 33, and at the same time pushes the limiting plate 370 to move towards the storage plate 33 and abut against the counterweight piece 4, that is, the counterweight piece 4 can be abutted between the limiting plate 370 and the limiting column 352 to fix the counterweight plate.

[0045] The implementation principle of a precise drilling machine for counterweight pieces in an embodiment of the present invention is as follows: Adjust the positions of the limiting column 352 and the limiting plate 370 according to the size of the counterweight piece 4 to ensure that the counterweight piece 4 can be clamped between the limiting plate 370 and the limiting column 352. Adjust the position of the adjusting plate 16 according to the thickness of the counterweight piece 4 to ensure that the drilling position of the counterweight piece 4 is at the same height as the drill bit 23. Control the piston rod of the cylinder 365 to retract, and move the first connecting rod 366 and the second connecting rod 367 away from the storage plate 33 to facilitate placing the counterweight piece 4 on the storage plate 33. The piston rod of the cylinder 365 extends, pushing the limiting plate 370 to move towards the counterweight piece 4 and abut against the end of the counterweight piece 4, that is, the counterweight piece 4 can be fixedly connected to the storage plate 33. Then, the piston rod of the hydraulic cylinder 32 extends, pushing the limiting plate 370 to move upward and abut against the adjusting plate 16. Finally, the drill bits 23 move towards each other, and at the same time the driving motor 22 drives the drill bits 23 to move to drill both sides of the counterweight piece 4.

[0046] A drilling process for a precise drilling machine for counterweight pieces includes the following steps:

[0047] S1. Debug the drilling machine: Adjust the positions of the limit posts 352 and the limit plate 370 according to the size of the counterweight piece 4 to ensure that the counterweight piece 4 can be clamped between the limit plate 370 and the limit posts 352. At the same time, adjust the position of the adjusting plate 16 according to the thickness of the counterweight piece 4 to ensure that the drilling position of the counterweight piece 4 is at the same height as the drill bit 23.

[0048] S2. Position the counterweight piece 4: Control the piston rod of the cylinder 365 to extend, and move away from the placement plate 33 through the first connecting rod 366 and the second connecting rod 367, which is convenient for placing the counterweight piece 4 on the placement plate 33. The piston rod of the cylinder 365 extends, pushing the limit plate 370 to move towards the counterweight piece 4 and abut against the end of the counterweight piece 4, that is, the counterweight piece 4 can be fixedly connected to the placement plate 33.

[0049] S3. Drill: The piston rod of the hydraulic cylinder 32 extends, pushing the placement plate 33 to move upward and abut against the adjusting plate 16, so that the drilling position of the counterweight piece 4 is at the same height as the drill bit 23. The drive motor 22 drives the drill bit 23 to move, and drills on both sides of the counterweight piece 4.

[0050] S4. Discharge: The piston rod of the hydraulic cylinder 32 retracts, driving the placement plate 33 to move downward. Control the piston rod of the cylinder 365 to retract, and move away from the placement plate 33 through the first connecting rod 366 and the second connecting rod 367, which is convenient for taking out the counterweight piece 4 from the placement plate 33.

[0051] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A precise drilling machine for counterweight plates, comprising a frame (1), on which a workbench (11) is arranged. Drilling mechanisms (2) are symmetrically arranged on both sides of the frame (1) and located on both sides of the workbench (11). Characterized in that: A positioning mechanism (3) is arranged inside the workbench (11); the positioning mechanism (3) includes a placement plate (33) vertically slidably connected inside the workbench (11). A baffle (112) is arranged at the top of the workbench (11). The placement plate (33) presses the counterweight plate (4) against the baffle (112) to limit the placement plate (33) in the vertical direction. At both ends of the placement plate (33), a first limiting component (35) and a second limiting component (36) for limiting both ends of the counterweight plate (4) are respectively arranged; The first limiting component (35) includes a fixing plate (351) fixedly connected to the placement plate (33). A limiting column (352) is threadedly connected to the fixing plate (351), and the limiting column (352) is used to abut against the end of the counterweight plate (4); The second limiting component (36) includes a positioning frame (361) fixedly connected to the placement plate (33). A connecting plate (363) is connected to the positioning frame (361). Limiting rods (364) are fixedly connected to both sides of the connecting plate (363). A sliding groove (3641) is opened on the side of the limiting rods (364) facing each other. A limiting plate (370) is horizontally slidably connected inside the sliding groove (3641). A driving component for driving the limiting plate (370) to abut against the end of the counterweight plate (4) is connected to the connecting plate (363); The driving component includes a cylinder (365) hinged to the connecting plate (363). The end of the piston rod of the cylinder (365) is hinged to a connecting column (3651). One end of the connecting column (3651) is respectively hinged to a first connecting rod (366) and a second connecting rod (367). The ends of the first connecting rod (366) and the second connecting rod (367) far from the connecting column (3651) are hinged to the limiting plate (370). At positions on the connecting column (3651) close to the first connecting rod (366) and the second connecting rod (367), a third connecting rod (368) and a fourth connecting rod (369) are respectively hinged. The ends of the third connecting rod (368) and the fourth connecting rod (369) far from the connecting column (3651) are hinged to the connecting plate (363); A guiding rod (362) is slidably connected to the positioning frame (361). A sliding groove (3611) for the guiding rod (362) to pass through is opened on the positioning frame (361). The guiding rod (362) is slidably connected inside the sliding groove (3611) of the positioning frame (361). A fixing bolt for fixing the guiding rod (362) to the positioning frame (361) is threadedly connected to the positioning frame (361). The connecting plate (363) is fixedly connected to the guiding rod (362); An adjusting plate (16) is arranged at the bottom of the baffle (112). The adjusting plate (16) is horizontally arranged. A screw rod (161) is rotatably connected to the adjusting plate (16), and the screw rod (161) is threadedly connected to the baffle (112).

2. The precise drilling machine for counterweight pieces according to claim 1, characterized in that: a hydraulic cylinder (32) is vertically arranged on the workbench (11), the end of the piston rod of the hydraulic cylinder (32) is fixedly connected to the bottom of the placement plate (33), a guide post (34) is fixedly connected to the placement plate (33), the axial direction of the guide post (34) is vertically arranged and is slidably connected to the baffle (112).

3. The precise drilling machine for counterweight pieces according to claim 1, characterized in that: the drilling mechanism (2) includes a positioning seat (21) slidably connected to the frame (1), a driving motor (22) is fixedly connected to the top of the positioning seat (21), the output shafts of the driving motors (22) are arranged towards each other, and a drill bit (23) is fixedly connected to the output shafts of the driving motors (22).

4. The precise drilling machine for counterweight pieces according to claim 1, characterized in that: guide plates (15) are fixedly connected to both sides of the baffle (112) symmetrically, through holes (151) are formed in the guide plates (15), the through holes (151) are used for the drill bit (23) to pass through, after the drill bit (23) passes through the through hole (151), it drills the counterweight piece (4), a material discharge hole (113) is formed in the top of the support plate (111) corresponding to the position of the guide plate (15), the material discharge hole (113) is internally connected to the guide plate (15), and a feed pipe (14) is inserted into the top of the support plate (111) at the material discharge hole (113), and one end of the feed pipe (14) far from the material discharge hole (113) is connected to an external coolant source.

5. A drilling method applied to the counterweight precise drilling machine according to any one of claims 1 to 4, characterized in that: It includes the following steps: S1. Debug the drilling machine: Adjust the positions of the limit post (352) and the limit plate (370) according to the size of the counterweight piece (4) to ensure that the counterweight piece (4) can be clamped between the limit plate (370) and the limit post (352). At the same time, adjust the position of the adjusting plate (16) according to the thickness of the counterweight piece (4) to ensure that the drilling position of the counterweight piece (4) is at the same height as the drill bit (23); S2. Position the counterweight piece (4): Control the piston rod of the cylinder (365) to extend, and move away from the placement plate (33) through the first connecting rod (366) and the second connecting rod (367), so as to facilitate placing the counterweight piece (4) on the placement plate (33). The piston rod of the cylinder (365) extends, pushing the limit plate (370) to move towards the counterweight piece (4) and abut against the end of the counterweight piece (4), that is, the counterweight piece (4) can be fixedly connected to the placement plate (33); S3. Drill holes: The piston rod of the hydraulic cylinder (32) extends, pushing the placement plate (33) to move upward and abut against the adjusting plate (16), so that the drilling position of the counterweight piece (4) is at the same height as the drill bit (23); The drive motor (22) drives the drill bit (23) to move and drill holes on both sides of the counterweight piece (4); S4. Discharge: The piston rod of the hydraulic cylinder (32) retracts, driving the placement plate (33) to move downward. Control the piston rod of the cylinder (365) to retract, and move away from the placement plate (33) through the first connecting rod (366) and the second connecting rod (367), so as to facilitate taking out the counterweight piece (4) from the placement plate (33).

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