Tailstock oil pipe direct connection mechanism
By adopting a combination structure of shaft and bearing in the tailstock oil pipe design of the five-axis linkage machining center, the problem of friction between the oil pipe and the inner wall of the shaft is solved, achieving stable connection and efficient sealing of the oil pipe, extending its service life and simplifying maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POLAR AXIS INTELLIGENT CONTROL SEIKO (SUZHOU) CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-12
AI Technical Summary
The tailstock oil pipe of the existing five-axis linkage machining center runs through the inside of the spindle, causing the rigid pipe to rub against the inner wall of the spindle. This poses a risk of damage and oil leakage after long-term use.
Design a tailstock oil pipe direct connection mechanism, which combines a shaft and a bearing. The shaft is rotatably mounted inside the shaft core through the bearing. The oil pipe runs through the shaft axially and is sealed and connected to the external pipeline. The outer ring of the bearing is fixed inside the shaft core to avoid oil pipe rotation friction.
This effectively avoids frictional damage between the oil pipe and the inner wall of the shaft, improves sealing reliability, extends the service life of the oil pipe, and simplifies the maintenance process.
Smart Images
Figure CN224346963U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of five-axis tailstock structure technology, and in particular to a tailstock oil pipe direct connection mechanism. Background Technology
[0002] A five-axis machining center is a precision machining equipment that simultaneously controls the coordinated movement of five coordinate axes (three linear axes: X, Y, and Z axes, and two rotary axes: A and C axes) through a computer numerical control (CNC) system, enabling high-precision machining of complex spatial curved surfaces. In a five-axis machining center, the A-axis rotates ±130° around the X-axis, and the C-axis rotates 360° around the Z-axis. The tailstock is the structure used to support the C-axis, and the A-axis drive drives the C-axis to tilt and swing around the tailstock as a fulcrum. In existing technology, the shaft in the tailstock is mounted on the tailstock via bearings and tilts and swings with the C-axis. The shaft is generally a hollow structure, and the oil pipe supplying the brakes to the five axes is placed inside the shaft. Because the shaft swings intermittently, there will be friction between the rigid oil pipe and the inner wall of the shaft. Prolonged friction can damage the oil pipe and pose a risk of oil leakage. This paper proposes a tailstock oil pipe direct connection mechanism to solve the problems existing in the prior art. Utility Model Content
[0003] The purpose of this utility model is to provide a tailstock oil pipe direct connection mechanism to solve the problem in the prior art where the oil pipe supplying oil to the brake of the five-axis is placed inside the shaft, and there is friction between the rigid oil pipe and the inner wall of the shaft. Long-term friction will damage the oil pipe and pose a risk of oil leakage.
[0004] The technical solution of this utility model is: a tailstock oil pipe direct connection mechanism, comprising:
[0005] Support unit, including tailstock;
[0006] A rotating nested unit includes a hollow shaft and a shaft nested coaxially; the shaft is rotatably mounted on a tailstock via bearings, and the shaft is rotatably mounted inside the shaft;
[0007] The liquid channel unit is an oil passage pipe that runs through the shaft along its axial direction. Both ends of the oil passage pipe are sealed and connected to external pipelines through connectors.
[0008] Preferably, the shaft is rotatably mounted inside the shaft via a bearing.
[0009] Preferably, the number of bearings for mounting the shaft is two, namely a first bearing and a second bearing; the shaft has a first annular groove and a second annular groove respectively opened at both ends along its axial direction, and the first bearing and the second bearing are press-fitted into the first annular groove and the second annular groove respectively.
[0010] Preferably, a first C-shaped buckle for limiting the first bearing is installed on the side of the shaft located away from the second bearing, and a second C-shaped buckle for limiting the second bearing is installed on the side of the shaft located away from the first bearing.
[0011] Preferably, the outer periphery of the shaft is provided with a third annular groove and a fourth annular groove for installing the first C-shaped buckle and the second C-shaped buckle, respectively.
[0012] Preferably, the pipe ends of the oil pipe are provided with conical PT threads for sealing and connecting the connectors.
[0013] Preferably, a axial pressure cap is fixedly provided on the front end face of the tailstock.
[0014] Preferably, the rear end face of the tailstock is provided with a rear cover.
[0015] Compared with the prior art, the advantages of this utility model are:
[0016] (1) A tailstock oil pipe direct connection mechanism of the present invention includes a support unit, a rotating nesting unit, and a liquid channel unit. The support unit includes a tailstock; the rotating nested unit includes a coaxially nested hollow shaft and a shaft rod; the shaft is rotatably mounted on the tailstock via bearings, and the shaft rod is rotatably mounted inside the shaft; the liquid channel unit is an oil passage pipe that runs through the shaft along its axial direction, and both ends of the oil passage pipe are sealed and connected to an external pipeline (oil pipe) via connectors. Since the oil passage pipe is located inside the shaft, in this invention, the shaft rod is fixedly mounted on the inner rings of the first and second bearings, and the outer rings of the first and second bearings are fixedly mounted inside the shaft. When the shaft oscillates along the A-axis under the drive of the A-axis drive component, the outer rings of the first and second bearings oscillate with the shaft, while the shaft rod connected to the external oil pipe (hard pipe) basically does not rotate. Even if the shaft rod is slightly pulled and oscillated by the external oil pipe, the shaft rod will rotate as a whole, avoiding the problem of friction of the oil pipe placed inside the shaft in the prior art. The shaft rod with an oil passage pipe replaces the oil pipe placed inside the shaft in the prior art, thus solving the problems existing in the prior art. The structural design is ingenious and highly practical.
[0017] (2) In the present invention, a tailstock oil pipe direct connection mechanism is provided, in which the shaft is installed inside the shaft through the first bearing and the second bearing to form a stable double-point support structure. This layout can withstand radial force and axial force at the same time, thus extending the service life of the shaft.
[0018] (3) In this utility model, a tailstock oil pipe direct connection mechanism is provided, in which the first C-type buckle and the second C-type buckle are embedded in the precision-machined third and fourth annular grooves to provide reliable axial mechanical limiting, ensuring that the axial movement of the first bearing and the second bearing is minimal when the outer rings of the first bearing and the second bearing swing with the axis. The disassembly and installation of the first C-type buckle and the second C-type buckle do not require complex equipment, and the maintenance efficiency is high. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0020] Figure 1 This is a front view structural schematic diagram of the tailstock oil pipe direct connection mechanism described in this utility model;
[0021] Figure 2 This is a rear view structural schematic diagram of the tailstock oil pipe direct connection mechanism described in this utility model;
[0022] Figure 3 This is a cross-sectional schematic diagram of a tailstock oil pipe direct connection mechanism according to the present invention.
[0023] The components are: 1. Tailstock, 2. Shaft, 3. Shaft rod, 4. Oil pipe, 5. First bearing, 6. Second bearing, 7. First C-type snap, 8. Second C-type snap, 9. PT thread, 10. Shaft cap, 11. Rear cover. Detailed Implementation
[0024] The present invention will be further described in detail below with reference to specific embodiments:
[0025] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.
[0026] like Figures 1-3As shown, a tailstock oil pipe direct connection mechanism includes a support unit, a rotating nested unit, and a liquid channel unit. The support unit includes a tailstock 1; the rotating nested unit includes a hollow shaft 2 and a shaft 3 coaxially nested; the shaft 2 is rotatably mounted on the tailstock 1 via bearings, and the shaft 3 is rotatably mounted inside the shaft 2; the liquid channel unit is an oil passage 4 that extends through the shaft 3 along its axial direction, and both ends of the oil passage 4 are sealed and connected to an external pipeline (oil pipe) via connectors.
[0027] The shaft 3 is rotatably mounted inside the shaft core 2 via bearings. Two bearings are used to mount the shaft 3: a first bearing 5 and a second bearing 6. A first annular groove and a second annular groove are respectively formed at both ends of the shaft core 2 along its axial direction. The first bearing 5 and the second bearing 6 are press-fitted into the first annular groove and the second annular groove respectively. The shaft 3 is mounted inside the shaft core 2 via the first bearing 5 and the second bearing 6, forming a stable double-point support structure. This layout can simultaneously withstand radial and axial forces, extending the service life of the shaft.
[0028] A first C-shaped buckle 7 is installed on the side of the first bearing 5 away from the second bearing 6, which limits the positioning of the first bearing 5. A second C-shaped buckle 8 is installed on the side of the second bearing 6 away from the first bearing 5, which limits the positioning of the second bearing 6. A third annular groove and a fourth annular groove are respectively provided on the outer circumference of the shaft 3 for installing the first C-shaped buckle 7 and the second C-shaped buckle 8. The first C-shaped buckle 7 and the second C-shaped buckle 8 are embedded in the precision-machined third and fourth annular grooves to provide reliable axial mechanical positioning, ensuring that the axial movement of the outer rings of the first bearing 5 and the second bearing 6 is minimal as they follow the swing of the shaft 2. The disassembly and installation of the first C-shaped buckle 7 and the second C-shaped buckle 8 require no complex equipment, resulting in high maintenance efficiency.
[0029] The oil pipe 4 has tapered PT threads 9 at both ends for sealing the connecting parts. The tapered design (1:16 taper) of the PT threads 9 generates radial compression force when the connecting parts are tightened, ensuring a tight fit between the metal sealing surfaces and maintaining zero leakage without the need for additional gaskets. Compared to existing interface seals (such as ferrule fittings which require copper washers), this improves sealing reliability. A axial pressure cap 10 is fixedly installed on the front end face of the tailstock 1. A rear cover 11 is installed on the rear end face of the tailstock 1.
[0030] In this invention, since the oil passage 4 is located in the shaft 3, and the shaft 3 is fixedly installed on the inner rings of the first bearing 5 and the second bearing 6, and the outer rings of the first bearing 5 and the second bearing 6 are fixedly installed inside the shaft 2, when the shaft 2 swings along the A-axis under the drive of the A-axis drive component, the outer rings of the first bearing 5 and the second bearing 6 swing with the shaft 2. The shaft 3, which is connected to the external oil pipe (rigid pipe), basically does not rotate. Even if the shaft 3 is slightly pulled by the external oil pipe, the shaft 3 will rotate as a whole. This avoids the problem of friction of the oil pipe placed inside the shaft 2 in the prior art. The shaft 3 with the oil passage 4 replaces the oil pipe placed inside the shaft 2 in the prior art, thus solving the problems existing in the prior art. The structural design is ingenious and highly practical.
[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection 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. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.
Claims
1. A tailstock oil pipe direct connection mechanism, characterized in that, include: Support unit, including tailstock; A rotating nested unit includes a hollow shaft and a shaft nested coaxially; the shaft is rotatably mounted on a tailstock via bearings, and the shaft is rotatably mounted inside the shaft; The liquid channel unit is an oil passage pipe that runs through the shaft along its axial direction. Both ends of the oil passage pipe are sealed and connected to external pipelines through connectors.
2. The tailstock oil pipe direct connection mechanism according to claim 1, characterized in that: The shaft is rotatably mounted inside the shaft via bearings.
3. The tailstock oil pipe direct connection mechanism according to claim 2, characterized in that: The number of bearings for mounting the shaft is two, namely the first bearing and the second bearing; the shaft has a first annular groove and a second annular groove respectively opened at both ends along its axial direction, and the first bearing and the second bearing are press-fitted into the first annular groove and the second annular groove respectively.
4. The tailstock oil pipe direct connection mechanism according to claim 3, characterized in that: A first C-shaped buckle is installed on the side of the first bearing away from the second bearing to limit the first bearing, and a second C-shaped buckle is installed on the side of the second bearing away from the first bearing to limit the second bearing.
5. The tailstock oil pipe direct connection mechanism according to claim 4, characterized in that: The outer periphery of the shaft is provided with a third annular groove and a fourth annular groove for installing the first C-type buckle and the second C-type buckle, respectively.
6. The tailstock oil pipe direct connection mechanism according to claim 1, characterized in that: The oil pipe has conical PT threads at both ends for sealing the connection parts.
7. The tailstock oil pipe direct connection mechanism according to claim 1, characterized in that: A spindle cap is fixedly installed on the front end face of the tailstock.
8. The tailstock oil pipe direct connection mechanism according to claim 1, characterized in that: The rear end face of the tailstock is provided with a rear cover.