Center water outlet numerical control machine tool loose tool rotation joint inaction mechanism

Abstract

The utility model provides a center water outlet numerical control machine tool loose tool rotation joint inaction mechanism, including front end subassembly, the back end subassembly is installed to front end subassembly back, front end subassembly includes hollow shaft, the inside installation of hollow shaft's front end has tool shank, back end subassembly includes spindle, the shell of axle holder is fixedly connected with hollow shaft, and the tail end of spindle is provided with water inlet seat, the outer end rotation of water inlet seat still has rotation joint and installed, the inside of spindle corresponding rotation joint is provided with follow -up slide, and one end of follow -up slide is connected with rotation joint, the other end of follow -up slide is connected with pull rod, and pull rod is connected with tool shank in the inside of hollow shaft, relative to prior art, high reliability, this structure passes through the follow -up of slide rod, and rotation joint can be inaction, has reduced the space, avoided the problem of high pressure oil pipe's breakage. Reduce the failure occurrence, improved machine tool safety reliability.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically a mechanism for a rotary joint to remain stationary when the tool is released in a center-outlet CNC machine tool. Background Technology

[0002] In high-speed drilling or milling operations, CNC machine tools utilize center-outlet water spindles for tool cooling and rapid chip removal. Water enters through the outer shell of a rotary joint, whose inner core is connected to a tie rod and rotates at high speed with the spindle. The tie rod is hollow at its center, allowing water to flow through and be pressurize the tool. During spindle operation, the inner core of the rotary joint rotates with the spindle, while the outer shell remains stationary. When the spindle stops for tool changes, the movement of the tie rod causes the entire rotary joint to move. This axial reciprocating movement of the rotary joint causes the oil pipes to bend and move, creating a space that increases the length of the spindle housing.

[0003] The key issue is that prolonged back-and-forth movement and curling can cause the oil pipe to break. The solution would be to prevent the rotary joint from moving axially during tool release and change, thus eliminating the space constraints, curling, and breakage problems. Currently, the rotary joints of CNC boring machines equipped with center-mounted water outlets move back and forth with the drawbar during tool release. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a mechanism that keeps the rotary joint stationary during tool release in a center-discharge CNC machine tool, thus solving the problems mentioned in the background section. This invention features a novel structure and high reliability. By using a sliding rod, the rotary joint remains stationary, reducing space requirements and preventing the high-pressure oil pipe from cracking. This reduces the occurrence of malfunctions and improves the safety and reliability of the machine tool.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rotating joint mechanism that remains stationary when the tool is released in a center-outlet CNC machine tool, comprising a front-end assembly and a rear-end assembly. The front-end assembly includes a hollow shaft, with a tool holder installed inside the front end of the hollow shaft. The rear-end assembly includes a spindle, with its housing fixedly connected to the hollow shaft. A water inlet seat is provided at the tail end of the spindle, and a rotating joint is rotatably mounted at the outer end of the water inlet seat. A follower slide rod is provided inside the spindle corresponding to the rotating joint, with one end of the follower slide rod connected to the rotating joint and the other end of the follower slide rod connected to a pull rod. The pull rod passes through the hollow shaft and connects to the tool holder. A sealing cover is fixed between the tail end of the spindle and the water inlet seat, and a sealing ring is fixed to the outer ring of the sealing cover. A sensing wheel is fixed to the outer side of the water inlet seat.

[0006] Furthermore, the front-end assembly also includes a claw assembly. The claw assembly is located inside the hollow shaft between the tool holder and the pull rod, and the pull rod is connected to the claw assembly in a driving connection. A pull stud is provided at the front end of the claw assembly.

[0007] Furthermore, a disc spring is provided on the rear end of the pull claw assembly and around the pull rod of the hollow shaft, a spindle outer cooling sleeve is provided on the outer wall of the hollow shaft, a synchronous pulley is provided at the bottom of the tail end of the hollow shaft, and a key is provided at the top of the tail end of the hollow shaft.

[0008] Furthermore, the rear-end assembly also includes a slider, which is mounted on the outer surface of the spindle. Multiple bearings are installed between the slider and the outer surface of the spindle, and washers are provided at both ends of the bearings and the slider.

[0009] Furthermore, a connecting flange is installed at the rear end of the main shaft and the slider. A connecting bolt is threaded between the outer side of the connecting flange and the slider, and a lock nut is provided on the inner side of the connecting flange.

[0010] Furthermore, a cylinder cover is fixed to the rear end of the connecting flange, two sets of cylinders are provided at the upper end of the cylinder cover, and a piston is provided inside the cylinder cover. An inductive switch bracket is fixed to the rear end of the cylinder cover, and a proximity switch is installed on the inductive switch bracket.

[0011] Furthermore, a slit transition body is provided inside the rear end of the spindle, and a tool release block is provided inside the spindle at the position where the pull rod and the follower slide rod connect.

[0012] Furthermore, the front end of the unclipping block is provided with a connecting body, and the pull rod passes through the connecting body.

[0013] The beneficial effects of this utility model are: The present invention has a directional split on the slit body for the installation of the tool loosening block. A water inlet seat for connecting the rotary joint is installed on the slit transition body. The rotary joint is installed on the water inlet seat. In this way, when the spindle is working and rotating, the inner core of the rotary joint rotates with the spindle. When the spindle stops to change or loosen the tool, the rotary joint does not move.

[0014] Compared to existing technologies, this invention offers higher reliability. By using a sliding rod, the rotary joint remains stationary, reducing space requirements and preventing the high-pressure oil pipe from cracking. This reduces the occurrence of malfunctions and improves the safety and reliability of the machine tool. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the rotating joint mechanism that remains stationary when the tool is released in the center-outlet CNC machine tool according to this utility model. Figure 2This is a schematic diagram of the front-end component of the mechanism that keeps the rotary joint stationary when the tool is released in the center-discharge CNC machine tool according to this utility model; Figure 3 This is a schematic diagram of the rear component of the rotary joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to this utility model. Figure 4 This is a schematic diagram showing the internal details of the rear-end component of the mechanism that keeps the rotary joint stationary when the tool is released in the center-outlet CNC machine tool according to this utility model.

[0016] In the diagram: 1. Front-end assembly; 11. Hollow shaft; 12. Tool holder; 13. Pull stud; 14. Pull claw assembly; 15. Spindle outer cooling sleeve; 16. Disc spring; 17. Synchronous pulley; 18. Key; 2. Rear-end assembly; 21. Spindle; 22. Washer; 23. Slider; 24. Bearing; 25. Lock nut; 26. Connecting bolt; 27. Connecting flange; 28. Cylinder cover; 29. ​​Piston; 210. Cylinder; 211. Inductive switch bracket; 212. Proximity switch; 213. Sealing cover; 214. Sealing ring; 215. Inductive wheel; 216. Water inlet seat; 217. Rotary joint; 218. Split transition body; 219. Follower slide rod; 220. Pull rod; 221. Tool release block; 222. Connecting body. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1 to 4This utility model provides a technical solution: a rotating joint mechanism that remains stationary when the tool is released in a center-outlet CNC machine tool, comprising a front end assembly 1, a rear end assembly 2, the front end assembly 1 including a hollow shaft 11, a tool holder 12 installed inside the front end of the hollow shaft 11, and the rear end assembly 2 including a spindle 21, the outer shell of the spindle 21 being fixedly connected to the hollow shaft 11, and a water inlet seat 216 provided at the tail end of the spindle 21, with a rotating joint 217 rotatably mounted on the outer end of the water inlet seat 216, the spindle 21 corresponding to the rotating joint 217. An internal follower slide rod 219 is provided, with one end of the follower slide rod 219 connected to a rotary joint 217, and the other end of the follower slide rod 219 connected to a pull rod 220. The pull rod 220 passes through the hollow shaft 11 and is connected to the tool holder 12. A sealing cover 213 is fixed between the tail end of the main shaft 21 and the water inlet seat 216, and a sealing ring 214 is fixed to the outer ring of the sealing cover 213. An induction wheel 215 is fixed to the outside of the water inlet seat 216. When the main shaft 21 stops to change the tool, the piston 29 is pushed forward by the hydraulic station oil supply. The piston 29 presses against the tool-changing block, and the tool-changing block moves forward to compress the disc. Spring 16 and pull rod 220 move the claw forward to push out tool holder 12. Tool holder 12 docks with tool magazine for automatic tool changing. When pull rod 220 moves forward, follower slide rod 219 slides in water inlet seat 216 without leaving water inlet seat 216, while water inlet seat 216 and rotary joint 217 do not move. After tool changing, disc spring 16 resets, hydraulic cylinder 210 reverses direction and returns, follower slide rod 219 returns to its original position, piston 29 disengages from tool clip, and machine tool enters rotary working state again. Rotary joint 217 supplies water, and the water supply of rotary joint 217 is pressurized at 3MPa. The pressure causes the Y-type seal to... The sealing ring 214 is tightened to prevent water leakage. The follower slide 219 and the water inlet seat 216 rotate synchronously with the main spindle 21, so there is no rotational friction wear. When the tool is released, the main spindle 21 is stopped. At this time, the main spindle 21 does not supply water and the pressure load has been relieved. The sliding friction wear of the follower slide 219 is close to zero. Through this, the follower slide 219 and the water inlet seat 216 rotate together when working and are unloaded when changing tools. The follower slide 219 slides while the water inlet seat 216 does not move. In this way, the rotary joint 217 does not move back and forth with the pull rod 220, reducing space and the risk of high-pressure oil pipe curling and breaking.

[0019] In this embodiment, the front-end component 1 further includes a puller assembly 14. The puller assembly 14 is disposed inside the hollow shaft 11 between the tool holder 12 and the pull rod 220, and the pull rod 220 is connected to the puller assembly 14 in a transmission manner. A pull stud 13 is disposed at the front end of the puller assembly 14. A disc spring 16 is disposed at the rear end of the hollow shaft 11 and around the pull rod 220. A spindle outer cooling sleeve 15 is disposed on the outer wall of the hollow shaft 11. A synchronous pulley 17 is disposed at the bottom of the tail end of the hollow shaft 11, and a key 18 is disposed at the top of the tail end of the hollow shaft 11. When the spindle 21 stops to change tools, the piston 29 is pushed forward by the hydraulic station oil supply. The piston 29 presses on the tool-changing block, the tool-changing block moves forward to compress the disc spring 16, the puller of the pull rod 220 moves forward to push out the tool holder 12, and the tool holder 12 docks with the tool magazine for automatic tool changing.

[0020] In this embodiment, the rear-end assembly 2 further includes a slider 23. The slider 23 is mounted on the outer surface of the main shaft 21. Multiple bearings 24 are installed between the slider 23 and the outer surface of the main shaft 21. Washers 22 are provided at both ends of the bearings 24 and the slider 23. A connecting flange 27 is installed at the rear end of the main shaft 21 near the slider 23. A connecting bolt 26 is threaded between the outer side of the connecting flange 27 and the slider 23. A lock nut 25 is provided on the inner side of the connecting flange 27. A cylinder cover 28 is fixed at the rear end. Two sets of cylinders 210 are provided at the upper end of the cylinder cover 28, and a piston 29 is provided inside the cylinder cover 28. A sensor switch bracket 211 is fixed at the rear end of the cylinder cover 28, and a proximity switch 212 is installed on the sensor switch bracket 211. A slit transition body 218 is provided inside the rear end of the main shaft 21. A tool release block 221 is provided inside the main shaft 21 at the connection position between the pull rod 220 and the follower slide rod 219. A tool release block 221 is provided at the front end of the tool release block 221. The connecting body 222, through which the pull rod 220 passes, allows the inner core of the rotary joint 217 to rotate with the spindle 21 during operation. When the spindle 21 loosens or changes tools, the rotary joint 217 does not move axially back and forth with the pull rod 220 but remains stationary. The slit body is cut in four directions for the installation of the tool loosening block 221. A water inlet seat 216 for connecting the rotary joint 217 is installed on the slit transition body 218. The rotary joint 217 is mounted on the water inlet seat 216, so that when the spindle 21 rotates during operation... The inner core of the rotary joint 217 rotates with the spindle 21. When the spindle 21 stops to change or release the tool, the rotary joint 217 does not move. The central pull rod 220 of the spindle 21 is connected to a plum blossom tool release block 221 through a connector 222 so that the piston 29 can push the tool release block 221 when it moves. A follower slide rod 219 is used between the tool release block 221 on the spindle 21 and the water inlet seat 216. The follower slide rod 219 is connected to the tool release block 221 with a tapered pipe thread and slides with the water inlet seat 216 through a sealing ring 214.

[0021] When the spindle 21 stops for tool change, the hydraulic station supplies oil to push the piston 29 forward. The piston 29 presses against the tool-removing block, the tool-removing block moves forward to compress the disc spring 16, and the pull rod 220's claw moves forward to push out the tool holder 12. The tool holder 12 engages with the tool magazine for automatic tool change. When the pull rod 220 moves forward, the follower slide rod 219 slides in the water inlet seat 216 without leaving the water inlet seat 216, while the water inlet seat 216 and the rotary joint 217 do not move. After tool change, the disc spring 16 resets, the hydraulic cylinder 210 reverses direction and returns, the follower slide rod 219 returns to its original position, the piston 29 disengages from the tool-removing block, and the machine tool enters the rotating working state again. The rotary joint 217 supplies water, and the rotation... The water supply to connector 217 is pressurized at 3MPa. The pressure causes the Y-type sealing ring 214 to tighten and prevent water leakage. The follower slide 219 and the water inlet seat 216 rotate synchronously with the spindle 21, without rotational friction wear. When the tool is released, the spindle 21 is stopped. At this time, the spindle 21 does not supply water, and the pressure load has been relieved. The sliding friction wear of the follower slide 219 is close to zero. Through this, the follower slide 219 and the water inlet seat 216 rotate together during operation and are unloaded when changing tools. The follower slide 219 slides while the water inlet seat 216 does not move. In this way, the rotary connector 217 does not move back and forth with the pull rod 220, reducing space and the risk of high-pressure oil pipe curling and cracking.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool, comprising a front-end component (1), characterized in that: The front-end assembly (1) is followed by a rear-end assembly (2). The front-end assembly (1) includes a hollow shaft (11), and a tool holder (12) is installed inside the front end of the hollow shaft (11). The rear-end assembly (2) includes a spindle (21), the outer shell of which is fixedly connected to the hollow shaft (11). A water inlet seat (216) is provided at the tail end of the spindle (21), and a rotary joint (217) is rotatably installed at the outer end of the water inlet seat (216). The spindle (21) corresponds to the rotary joint (217). The internal part is provided with a follower slide rod (219), and one end of the follower slide rod (219) is connected to the rotary joint (217). The other end of the follower slide rod (219) is connected to a pull rod (220), and the pull rod (220) passes through the hollow shaft (11) and is connected to the tool holder (12). A sealing cover (213) is fixed between the tail end of the main shaft (21) and the water inlet seat (216), and a sealing ring (214) is fixed on the outer ring of the sealing cover (213). A sensing wheel (215) is fixed on the outer side of the water inlet seat (216).

2. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 1, characterized in that: The front end assembly (1) also includes a claw assembly (14). The claw assembly (14) is located inside the hollow shaft (11) between the tool holder (12) and the pull rod (220). The pull rod (220) is connected to the claw assembly (14) in a transmission manner. The front end of the claw assembly (14) is provided with a pull stud (13).

3. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 2, characterized in that: The hollow shaft (11) is provided with a disc spring (16) at the rear end of the pull claw assembly (14) and the periphery of the pull rod (220). The outer wall of the hollow shaft (11) is provided with a main shaft (21) outer cooling sleeve (15). The bottom of the tail end of the hollow shaft (11) is provided with a synchronous pulley (17), and the top of the tail end of the hollow shaft (11) is provided with a key (18).

4. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 1, characterized in that: The rear-end component (2) also includes a slider (23), which is mounted on the outer surface of the main shaft (21). Multiple bearings (24) are installed between the slider (23) and the outer surface of the main shaft (21), and washers (22) are provided at both ends of the bearings (24) and the slider (23).

5. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 4, characterized in that: The main shaft (21) is located at the rear end of the slider (23) and a connecting flange (27) is installed. A connecting bolt (26) is threaded between the outer side of the connecting flange (27) and the slider (23), and a locking nut (25) is provided on the inner side of the connecting flange (27).

6. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 5, characterized in that: The rear end of the connecting flange (27) is fixed with a cylinder cover (28), the upper end of the cylinder cover (28) is provided with two sets of cylinders (210), and the inside of the cylinder cover (28) is provided with a piston (29). The rear end of the cylinder cover (28) is fixed with an induction switch bracket (211), and a proximity switch (212) is installed on the induction switch bracket (211).

7. The rotary joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 6, characterized in that: The rear end of the main shaft (21) is provided with a slit transition body (218), and the main shaft (21) is provided with a tool release block (221) at the position where the pull rod (220) and the follower slide rod (219) are connected.

8. The rotating joint mechanism that remains stationary when the tool is released in a center-discharge CNC machine tool according to claim 7, characterized in that: The front end of the unclipping block (221) is provided with a connector (222), and the pull rod (220) passes through the connector (222).

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