Servo drilling power head

Abstract

The utility model discloses a servo drilling power head, which relates to the technical field of machining equipment, and comprises a main shaft, a main shaft box, a driving mechanism and an automatic tool changing mechanism, the automatic tool changing mechanism comprises an unclamping cylinder, a broaching tool assembly, a bearing seat and a fixing frame; the bearing seat is arranged at the rear end of the spindle box, and the spindle is rotatably arranged in the spindle box and the bearing seat through the driving mechanism; the broach assembly can be axially and movably arranged in the main shaft, and the end part of the broach assembly is provided with a power input end extending to the rear end of the bearing seat; the unclamping cylinder is arranged at the rear end of the bearing seat through a fixing frame, and a piston of the unclamping cylinder abuts against or is separated from the power input end. According to the utility model, the design cost and the dismounting difficulty of the unclamping cylinder can be effectively reduced, and the unclamping cylinder can be assembled only by selecting the existing standard unclamping cylinder in the market according to the specific parameters of the power head, so that the automatic tool changing mechanism can be widely applied to various power heads with different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of machining equipment, in particular to a servo drilling power head. Background Art

[0002] Machining center tools usually include components such as a frame, a workbench, a power head and a tool magazine. In order to improve work efficiency, the power head is equipped with an automatic tool change mechanism, which can cooperate with the tool magazine to complete the operation of changing tools under the command of the control system. The power head is the core component of the machining center tool, and its working stability directly affects the machining accuracy and quality of the workpiece. This requires that the automatic tool change mechanism needs to be better compatible with the internal structure of the power head to ensure a smooth tool change process and will not adversely affect the processing action of the power head.

[0003] The Chinese patent with the announcement number CN213531601U discloses a CNC gantry compound machine, in which the power head of the CNC gantry compound machine is provided with an automatic tool changing mechanism composed of a tool-beating cylinder, a pull rod, a clamping claw and a reset spring. In order to make the automatic tool changing mechanism more compatible with the internal structure of the power head, the patent designs the tool-beating cylinder as an annular structure, that is, a hollow cavity is provided on the piston of the tool-beating cylinder, and an axially movable connecting seat is provided in the hollow cavity, and the connecting seat is fixedly connected to the end of the pull rod. When changing the tool, the connecting seat, the pull rod and the clamping claw are pushed axially by the piston, so that the clamping claw moves to the empty tool position of the spindle, thereby releasing the tool; after the clamping claw is equipped with a new tool, the tool-beating cylinder is depressurized, and the connecting seat, the pull rod and the clamping claw are reset under the elastic action of the reset spring, so that the clamping claw re-enters the spindle, thereby completing the tool changing work.

[0004] Although the structural design of the automatic tool changing mechanism in this patent is reasonable and compact, and can effectively save the design space of the power head, the knife-beating cylinder with a ring-shaped structure has the problem of poor adaptability and needs to be customized according to different power head sizes. It is also troublesome to install, replace and maintain, so there is still room for improvement. In addition, the power head is not equipped with an axial feed mechanism, so the spindle does not have an axial feed function. If an axial feed mechanism is set in the power head, the automatic tool changing mechanism needs to be further adjusted. Otherwise, the automatic tool changing mechanism may swing while following the spindle in the axial direction, making it difficult for the spindle to achieve smooth and accurate feeding, which has an adverse effect on the processing action. Utility Model Content

[0005] The utility model provides a servo drilling power head, the main purpose of which is to solve the problems of poor adaptability, troublesome assembly and disassembly of the automatic tool changing mechanism of the existing power head and easy swinging during axial movement.

[0006] The utility model adopts the following technical solutions:

[0007] A servo drilling power head comprises a spindle, a spindle box, a driving mechanism and an automatic tool changing mechanism, wherein the automatic tool changing mechanism comprises a tool beating cylinder, a broach assembly, a bearing seat and a fixing frame; the bearing seat is arranged at the rear end of the spindle box, and the spindle is rotatably arranged in the spindle box and the bearing seat through the driving mechanism; the broach assembly is axially movably installed in the spindle, and the end of the broach assembly is provided with a power input end extending to the rear end of the bearing seat; the tool beating cylinder is arranged at the rear end of the bearing seat through a fixing frame, and the piston of the tool beating cylinder abuts against or separates from the power input end.

[0008] Furthermore, the bearing seat includes a seat body, a bearing and a preload assembly, and a bearing cavity is provided in the seat body; a plurality of the bearing sleeves are arranged outside the main shaft and are installed in the bearing cavity through the preload assembly.

[0009] Furthermore, the outer wall of the main shaft is provided with a recessed portion for making way, and the recessed portion for making way is in contact with the front end of the seat body; the pre-tightening assembly comprises an end cover and a locking nut, and the end cover and the locking nut are installed at the rear end of the seat body.

[0010] Furthermore, a first labyrinth groove is provided at the front end of the seat body, and a first labyrinth dustproof ring matched with the first labyrinth groove is provided between the main shaft and the seat body.

[0011] Furthermore, the end cover is provided with a second labyrinth groove, and a second labyrinth dustproof ring matched with the second labyrinth groove is provided between the main shaft and the end cover.

[0012] Furthermore, it also includes a feeding mechanism for driving the main shaft and the automatic tool changing mechanism to slide axially, and the bearing seat can be axially slidably arranged at the rear end of the main shaft box through a sliding component.

[0013] Furthermore, the sliding assembly includes a support plate, a first slide rail and a first slider, the support plate is fixedly arranged on the outside of the spindle box, the first slide rail is arranged on the inside of the support plate, and the first slider matching with the first slide rail is arranged on the outside of the bearing seat.

[0014] Furthermore, the driving mechanism includes a motor box arranged between the main spindle box and the bearing seat, the motor box and the outer side of the main spindle box form a step surface, and the support plate is in a Z-shaped structure adapted to the step surface.

[0015] Furthermore, the support plate is provided with a reinforcing rib along its length direction.

[0016] Furthermore, the broach assembly comprises a pull rod, a disc spring, a pull claw and a pull nail that cooperate with each other, and the power input end is provided at the end of the pull rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The utility model optimizes and improves the automatic tool changing mechanism, and supports the broaching assembly and the tool beating cylinder through a bearing seat and a fixing frame respectively, so that the two can be disassembled independently and cooperate with each other to complete the tool changing action, thereby effectively reducing the design cost and disassembly and assembly difficulty of the tool beating cylinder. During assembly, it is only necessary to select the existing standard tool beating cylinder in the market according to the specific parameters of the power head, so that the automatic tool changing mechanism can be widely applied to power heads of various specifications.

[0019] 2. The utility model provides an automatic tool changing mechanism with a sliding assembly. When the feed mechanism drives the spindle to feed along its axial direction, the automatic tool changing mechanism as a whole follows the spindle to slide along the axial direction. At this time, the sliding assembly can play a guiding and supporting role, and can ensure that the bearing seat and the knife cylinder slide smoothly along the axial direction without shaking, so that the structures of the feed mechanism and the automatic tool changing mechanism are better compatible with the power head. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is an exploded schematic diagram of the utility model.

[0022] Figure 3 It is a cross-sectional schematic diagram of the utility model.

[0023] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0024] In the figure: 1-spindle; 11-shaft sleeve; 12-displacement recess; 2-spindle box; 21-displacement groove; 22-second slide rail; 3-driving mechanism; 31-motor box; 32-spindle motor; 4-automatic tool changing mechanism; 41-knife cylinder; 411-piston; 42-bearing seat; 421-seat body; 422-bearing; 423-end cover; 424-locking nut; 425-first labyrinth groove; 426-first labyrinth dust ring; 427-first Second labyrinth groove; 428-second labyrinth dustproof ring; 43-fixed frame; 44-pull rod; 441-power input terminal; 45-disc spring; 46-pull claw; 47-pull pin; 48-sliding assembly; 481-support plate; 482-first slide rail; 483-first slider; 484-reinforcement rib; 5-feed mechanism; 511-screw; 512-screw nut; 52-servo motor; 53-connecting seat; 531-second slider; 54-cover body. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details.

[0026] like Figures 1 to 3 As shown, a servo drilling power head includes a spindle 1, a spindle box 2, a driving mechanism 3 and an automatic tool changing mechanism 4, wherein the automatic tool changing mechanism 4 includes a tool beating cylinder 41, a broach assembly, a bearing seat 42 and a fixing frame 43; the bearing seat 42 is arranged at the rear end of the spindle box 2, and the spindle 1 is rotatably arranged in the spindle box 2 and the bearing seat 42 through the driving mechanism 3; the broach assembly is axially movably installed in the spindle 1, and the end of the broach assembly is provided with a power input end 441 extending to the rear end of the bearing seat 42; the tool beating cylinder 41 is arranged at the rear end of the bearing seat 42 through the fixing frame 43, and the piston 411 of the tool beating cylinder 41 is in contact with or separated from the power input end 441.

[0027] like Figures 1 to 3 As shown, the utility model designs the broaching assembly and the knife beating cylinder 41 of the automatic tool changing mechanism 4 as two independently detachable parts, and supports the broaching assembly and the knife beating cylinder 41 through a bearing seat 42 and a fixing frame 43 respectively, so that the structures of the two can be reasonably compatible and cooperate with each other to complete the tool changing action, thereby effectively reducing the design cost and disassembly and assembly difficulty of the knife beating cylinder 41. During assembly, it is only necessary to select the standard knife beating cylinder 41 available in the market according to the specific parameters of the power head, so that the automatic tool changing mechanism 4 can be widely applied to power heads of various specifications.

[0028] like Figure 3 and Figure 4 As shown, the broach assembly includes a pull rod 44, a disc spring 45, a pull claw 46 and a pull pin 47 that cooperate with each other, and a power input end 441 is provided at the end of the pull rod 44. The assembly method and working principle of each component in the broach assembly belong to the prior art, so they are not described here.

[0029] like Figures 1 to 4 As shown, the bearing seat 42 includes a seat body 421, a bearing 422 and a preload assembly, and a bearing cavity is provided in the seat body 421; a plurality of bearings 422 are sleeved on the outside of the spindle 1 and installed in the bearing cavity through the preload assembly. The design of the bearing seat 42 plays a role in indirectly connecting the broaching assembly and the tool-beating cylinder 41, so that the broaching assembly can be separated from the tool-beating cylinder 41 under the condition of not changing the tool, so as to rotate synchronously with the spindle 1, and can be connected to the tool-beating cylinder 41 under the condition of changing the tool, so as to move axially in the spindle 1.

[0030] like Figures 1 to 3As shown, specifically, the outer wall of the main shaft 1 is provided with a recess 12, and the recess 12 is in contact with the front end of the seat body 421; the pre-tightening assembly includes an end cover 423 and a locking nut 424, and the end cover 423 and the locking nut 424 are installed at the rear end of the seat body 421. In order to improve the sealing effect, the front end of the seat body 421 is provided with a first labyrinth groove 425, and a first labyrinth dustproof ring 426 adapted to the first labyrinth groove 425 is provided between the main shaft 1 and the seat body 421; the end cover 423 is provided with a second labyrinth groove 427, and a second labyrinth dustproof ring 428 adapted to the second labyrinth groove 427 is provided between the main shaft 1 and the end cover 423.

[0031] like Figures 1 to 3 As shown, the servo drilling power head also includes a feeding mechanism 5 for driving the main shaft 1 and the automatic tool changing mechanism 4 to slide axially. Specifically, a sleeve 11 is sleeved on the outside of the main shaft 1, and the feeding mechanism 5 includes a screw pair, a servo motor 52 and a connecting seat 53; the screw pair includes a screw rod 511 and a screw rod nut 512 that cooperate with each other, and the screw rod 511 is rotatably arranged on the top of the main shaft box 2 through the servo motor 52; the main shaft box 2 is provided with a clearance groove 21 above the sleeve 11, and a second slide rail 22 is provided on both sides of the clearance groove 21; a second slider 531 that cooperates with the second slide rail 22 is provided on both sides of the connecting seat 53, and the upper end of the connecting seat 53 is fixedly connected to the screw rod nut 512, and the lower end of the connecting seat 53 is fixedly connected to the sleeve 11. During operation, the servo motor 52 drives the screw 511 to rotate, so that the screw nut 512 slides along the axial direction of the screw 511, thereby causing the connecting seat 53 to drive the sleeve 11, the spindle 1 and the automatic tool changing mechanism 4 to slide along the axial direction, thereby realizing axial feeding. The setting of the connecting seat 53 in the utility model makes the connection between the feeding mechanism 5 and the sleeve 11 more firm and reliable, and the setting of the second slide rail 22 and the second slider 531 enables the connecting seat 53 to drive the sleeve 11 to slide along the axial direction more accurately and smoothly, thereby accurately controlling the spindle 1 to realize axial feeding, and effectively improving the processing accuracy, rigidity and stability of the power head.

[0032] like Figure 1 and Figure 2As shown, during axial feeding, the automatic tool changing mechanism 4 as a whole needs to move axially with the spindle 1 and the sleeve 11. Therefore, in order to prevent the automatic tool changing mechanism 4 from swinging during movement, the utility model provides a sliding assembly 48 for the automatic tool-beating mechanism, that is, the bearing seat 42 can be axially slidably arranged at the rear end of the spindle box 2 through the sliding assembly 48. Specifically, the sliding assembly 48 includes a support plate 481, a first slide rail 482 and a first slider 483. The support plate 481 is fixedly arranged on the outside of the spindle box 2, and the first slide rail 482 is arranged on the inner side of the support plate 481. The first slider 483 matched with the first slide rail 482 is arranged on the outer side of the bearing seat 42. The first slide rail 482 and the first slider 483 matched with each other can guide the bearing seat 42, so that the bearing seat 42 can drive the tool-beating cylinder 41 to slide smoothly along the axial direction without shaking.

[0033] like Figure 1 and Figure 2 As shown, the driving mechanism 3 includes a motor box 31 and a spindle motor 32. The motor box 31 is arranged between the spindle box 2 and the bearing seat 42, and a transmission assembly (not shown in the figure) is arranged in the motor box 31. The spindle 1 is connected to the spindle motor 32 through the transmission assembly. When working, the rotation of the spindle 1 is driven by the spindle motor 32. The motor box 31 and the outer side of the spindle box 2 form a step surface, and the support plate 481 is a Z-shaped structure adapted to the step surface, and the support plate 481 is provided with a reinforcing rib 484 along its length. Such a design can make the support plate 481 more compact and firm in cooperation with the spindle box 2 and the motor box 31, and can effectively improve the structural strength of the support plate 481, thereby providing solid and reliable support for the bearing seat 42 and the knife cylinder 41.

[0034] like Figures 1 to 3 As shown, the feed mechanism 5 also includes a cover body 54, which is detachably arranged above the spindle box 2, so as to effectively cover the clearance groove 21 and the screw rod 511, play a waterproof and dustproof effect, and help to extend the service life of the power head.

[0035] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. A servo drilling power head, characterized in that: It includes a main shaft, a main shaft box, a driving mechanism and an automatic tool changing mechanism, wherein the automatic tool changing mechanism includes a tool beating cylinder, a broach assembly, a bearing seat and a fixing frame; the bearing seat is arranged at the rear end of the main shaft box, and the main shaft is rotatably arranged in the main shaft box and the bearing seat through the driving mechanism; the broach assembly is axially movably installed in the main shaft, and the end of the broach assembly is provided with a power input end extending to the rear end of the bearing seat; the tool beating cylinder is arranged at the rear end of the bearing seat through a fixing frame, and the piston of the tool beating cylinder is in contact with or separated from the power input end.

2. A servo drilling power head according to claim 1, characterized in that: The bearing seat includes a seat body, a bearing and a preload assembly. A bearing cavity is provided in the seat body. A plurality of bearing sleeves are arranged outside the main shaft and are installed in the bearing cavity through the preload assembly.

3. A servo drilling power head as claimed in claim 2, characterized in that: The outer wall of the main shaft is provided with a recessed portion, which abuts against the front end of the seat body; the pre-tightening assembly includes an end cover and a locking nut, and the end cover and the locking nut are installed at the rear end of the seat body.

4. A servo drilling power head as claimed in claim 3, characterized in that: A first labyrinth groove is arranged at the front end of the seat body, and a first labyrinth dustproof ring matched with the first labyrinth groove is arranged between the main shaft and the seat body.

5. A servo drilling power head as claimed in claim 3, characterized in that: The end cover is provided with a second labyrinth groove, and a second labyrinth dustproof ring matched with the second labyrinth groove is provided between the main shaft and the end cover.

6. A servo drilling power head according to claim 1, characterized in that: It also includes a feeding mechanism for driving the main shaft and the automatic tool changing mechanism to slide axially. The bearing seat can be axially slidably arranged at the rear end of the main shaft box through a sliding component.

7. A servo drilling power head according to claim 6, characterized in that: The sliding assembly includes a support plate, a first slide rail and a first slider. The support plate is fixedly arranged on the outside of the spindle box, and the first slide rail is arranged on the inside of the support plate. The first slider matched with the first slide rail is arranged on the outside of the bearing seat.

8. A servo drilling power head according to claim 7, characterized in that: The driving mechanism comprises a motor box arranged between the main spindle box and the bearing seat, the motor box and the outer side of the main spindle box form a step surface, and the support plate is in a Z-shaped structure adapted to the step surface.

9. A servo drilling power head according to claim 7, characterized in that: The support plate is provided with a reinforcing rib along its length direction.

10. The servo drilling power head according to claim 1, characterized in that: The broach assembly comprises a pull rod, a disc spring, a pull claw and a pull nail which cooperate with each other, and the end of the pull rod is provided with the power input end.

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