Main shaft structure of numerical control machining center

Abstract

The utility model discloses a main shaft structure of a numerical control machining center, which comprises a main shaft sleeve, a main rotating shaft rod and an outer mounting disc, in the using process of the main shaft structure, a one-way blocking valve is arranged in the middle section area in a filling hole, and the one-way blocking valve can effectively avoid reverse backflow of lubricating grease in the filling hole. Meanwhile, external air entering is reduced, the viscosity of lubricating grease is kept, long-acting use of the main shaft structure is guaranteed, the lubricating grease falling on the surface of the arc-shaped guide plate can flow into a viscous ball area through a guide groove in the surface of the ball blocking frame, part of the lubricating grease can be attached to the viscous ball area, and the service life of the main shaft structure is prolonged. And the lubricating grease is reserved in the top area of the positioning bearing, so that the lubricating grease can intermittently drip in the using process of the positioning bearing, long-acting lubrication of the positioning bearing is guaranteed, and the service life of the main shaft structure is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control spindle processing, in particular to a spindle structure of a numerical control processing center. Background Art

[0002] A CNC machining center is a high-efficiency automated machine tool composed of mechanical equipment and a CNC system, suitable for processing complex parts. The spindle refers to the axis that receives power from an engine or electric motor and transmits it to other parts. The spindle structure is commonly used in CNC machining centers.

[0003] The spindle structure usually consists of a spindle, bearings and transmission parts. The spindle components are mainly used to support transmission parts such as gears and pulleys in the machine, transmit motion and torque, such as the machine tool spindle, and some are used to clamp workpieces.

[0004] In the prior art, a spindle structure of a CNC machining center disclosed in publication number "CN213559903U" includes a cylinder body, one end of the outer side of the cylinder body is fixedly connected to a first fixed disk, and the end of the outer side of the cylinder body away from the first fixed disk is fixedly connected to a second fixed disk. Buffer grooves are provided at both ends of the inside of the cylinder body, and the inner walls of the buffer grooves are fixedly connected to a first return spring. The beneficial effects achieved by the utility model are: the utility model has a compact structure and strong practicality. By arranging a shock-absorbing mechanism between the cylinder body and the shaft core, the working shaft core can be damped, thereby avoiding damage to the shaft core due to excessive vibration force, thereby greatly extending the service life of the equipment. At the same time, by arranging a cooling component on the outside of the shaft core, the heat generated during the operation of the shaft core can be quickly taken away, thereby avoiding excessive temperature of the shaft core, greatly improving the use effect of the equipment.

[0005] However, the existing technology still has major deficiencies, such as:

[0006] In the above-mentioned device and the prior art, a cooling structure is provided on the shaft core part to achieve the purpose of heat dissipation through the cooperation of the mechanical structure during the rotation of the shaft core. During use, the mechanical structure is easily damaged due to too many moving parts, causing failure of the cooling structure. When the main shaft structure is in use, the shaft body inside the structure needs to be lubricated, but the setting of the cooling structure will prevent the injected lubricating medium from directly contacting the shaft body structure, affecting the service life of the main shaft structure. Utility Model Content

[0007] The purpose of the present utility model is to provide a spindle structure for a CNC machining center to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a spindle structure for a CNC machining center, comprising a spindle sleeve, a main rotating shaft rod, and an outer mounting plate, wherein the outer mounting plate is mounted on both ends of the spindle sleeve, a locating bearing is mounted inside the spindle sleeve, the locating bearings are provided in two groups, a movable inner ring is provided inside the locating bearing, the main rotating shaft rod is mounted on the inner wall of the movable inner ring, and the outer mounting plate is connected to the spindle sleeve;

[0009] The main shaft rotation lubrication unit is arranged in the positioning bearing area, and is used to provide long-term lubrication protection for the positioning bearing area, thereby improving the smooth rotation of the main shaft part in the positioning bearing area.

[0010] Preferably, the main shaft rotation lubrication unit includes a guide portion, the guide portion includes a docking turntable, the docking turntable is installed on the surface of the main shaft, and the surface of the docking turntable is provided with a perfusion hole.

[0011] Preferably, the main shaft rod rotation lubrication unit includes an adsorption part, the adsorption part includes an outer ring frame, the outer ring frame is installed on the positioning bearing surface, a ball retainer is provided on the inner side of the outer ring frame, an arc guide plate is provided on the main shaft rod surface near the ball retainer area, a ball barrier frame is provided on the top of the arc guide plate, viscous balls are provided between the ball barrier frame and the ball retainer, and the viscous balls are spaced apart and arranged into several groups.

[0012] Preferably, the main rotating shaft rod is composed of three sections, and the main rotating shaft rod includes a narrow-side shaft body and a wide-side shaft body. The wide-side shaft body is arranged in two groups, and the two groups of wide-side shaft bodies are installed at both ends of the narrow-side shaft body. The narrow-side shaft body is installed on the inner wall of the movable inner ring.

[0013] Preferably, the perfusion hole passes through the surface of the wide shaft body, the perfusion hole faces the arc guide plate and the positioning bearing surface, and a one-way blocking valve is installed in the inner cavity of the perfusion hole.

[0014] Preferably, the inner side of the ball barrier frame is provided with guide grooves, and the guide grooves are arranged in a ring shape into several groups.

[0015] Preferably, an airflow circulation heat conduction unit is provided on the surface of the main shaft sleeve.

[0016] Preferably, the air circulation heat conduction unit includes a heat dissipation air film, and the surface of the spindle sleeve is provided with heat dissipation holes, the heat dissipation holes are arranged in a ring shape and are arranged in several groups, and one end of the heat dissipation holes is connected to the positioning bearing area.

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

[0018] 1. During use, a one-way barrier valve is installed in the middle area of ​​the filling hole. The one-way barrier valve can effectively prevent the reverse flow of lubricating grease in the filling hole, while reducing the ingress of external air, maintaining the viscosity of the lubricating grease, and helping to ensure the long-term use of the spindle structure;

[0019] 2. During use, the lubricating grease falling on the surface of the arc guide plate can flow into the viscous ball area through the guide groove on the surface of the ball barrier frame. Part of the lubricating grease will adhere to the viscous ball area, so that the lubricating grease will remain in the top area of ​​the locating bearing. During the use of the locating bearing, the lubricating grease can be intermittently dripped, ensuring long-term lubrication of the locating bearing and improving the service life of the spindle structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall device of the utility model;

[0021] Figure 2 This is a schematic diagram of the main shaft rod portion of the present utility model;

[0022] Figure 3 This is a partial schematic diagram of the injection hole and the one-way barrier valve in the utility model;

[0023] Figure 4 This is a schematic diagram of the arc-shaped guide plate portion of the present invention;

[0024] Figure 5 This is a partial schematic diagram of the ball cage in the utility model;

[0025] Figure 6 This is a partial schematic diagram of the ball barrier frame and guide groove in the present invention.

[0026] In the figure: 1. Main shaft sleeve; 11. Heat dissipation hole; 12. Heat dissipation air film; 2. Outer mounting plate; 3. Main rotating shaft rod; 31. Narrow shaft body; 32. Wide shaft body; 4. Docking turntable; 41. Infusion hole; 42. One-way barrier valve; 5. Positioning bearing; 51. Movable inner ring; 6. Arc guide plate; 7. Outer ring frame; 71. Ball retainer; 72. Arc rolling groove; 8. Ball barrier frame; 81. Guide groove; 82. Viscous ball. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-6 , the utility model provides a technical solution:

[0029] Example 1: A spindle structure of a CNC machining center includes a spindle sleeve 1, a main rotating shaft rod 3, and an outer mounting plate 2. The outer mounting plate 2 is mounted on both ends of the spindle sleeve 1. A locating bearing 5 is mounted inside the spindle sleeve 1. The locating bearing 5 is provided in two sets. The locating bearing 5 has a movable inner ring 51 inside. The main rotating shaft rod 3 is mounted on the inner wall of the movable inner ring 51. The outer mounting plate 2 is connected to the spindle sleeve 1.

[0030] The main shaft rod rotation lubrication unit is arranged in the locating bearing 5 area, which is used to provide long-term lubrication protection for the locating bearing 5 area and improve the smooth rotation of the main shaft rod 3 part in the locating bearing 5 area.

[0031] The main shaft rotation lubrication unit includes a guide portion, which includes a docking turntable 4. The docking turntable 4 is installed on the surface of the main shaft 3. The surface of the docking turntable 4 is provided with a perfusion hole 41.

[0032] The main shaft rotation lubrication unit includes an adsorption part, which includes an outer ring frame 7. The outer ring frame 7 is installed on the surface of the positioning bearing 5. A ball retainer 71 is provided on the inner side of the outer ring frame 7. An arc guide plate 6 is provided on the surface of the main shaft rod 3 near the ball retainer 71. A ball barrier frame 8 is provided on the top of the arc guide plate 6. Viscous balls 82 are provided between the ball barrier frame 8 and the ball retainer 71. The viscous balls 82 are arranged in several groups at intervals.

[0033] The main rotating shaft rod 3 is composed of three sections. The main rotating shaft rod 3 includes a narrow shaft body 31 and a wide shaft body 32. The wide shaft body 32 is set into two groups. The two groups of wide shaft bodies 32 are installed at both ends of the narrow shaft body 31. The narrow shaft body 31 is installed on the inner wall of the movable inner ring 51.

[0034] The injection hole 41 passes through the surface of the wide shaft body 32 , and faces the surface of the arc guide plate 6 and the positioning bearing 5 . A one-way blocking valve 42 is installed in the inner cavity of the injection hole 41 .

[0035] The inner side of the ball blocking frame 8 is provided with guide grooves 81 , and the guide grooves 81 are arranged in a ring shape and are provided in a plurality of groups.

[0036] In this embodiment, the lubricating grease is transported into the positioning bearing 5 area through the filling hole 41, and the lubricating grease drips toward the arc guide plate 6 area through the bottom of the filling hole 41. A one-way barrier valve 42 is installed in the middle area inside the filling hole 41. The one-way barrier valve 42 can effectively prevent the reverse flow of the lubricating grease in the filling hole 41, while reducing the entry of external gas, maintaining the viscosity of the lubricating grease, and helping to ensure the long-term use of the main shaft structure.

[0037] An airflow circulation heat conduction unit is provided on the surface of the main shaft sleeve 1.

[0038] The air circulation heat conduction unit includes a heat dissipation air film 12. The surface of the spindle sleeve 1 is provided with heat dissipation holes 11. The heat dissipation holes 11 are arranged in a ring shape and are arranged in several groups. One end of the heat dissipation hole 11 is connected to the positioning bearing 5 area.

[0039] In this embodiment, when the external air contacts the heat dissipation film 12, the heat stored in the heat dissipation film 12 can be guided and taken away, thereby realizing air-cooled heat dissipation in the heat dissipation through-hole 11 area, while avoiding overheating in the heat dissipation through-hole 11 area, affecting the service life of the lubricating grease, further ensuring the long-term lubrication of the positioning bearing 5, and improving the service life of the main shaft structure.

[0040] Working principle: During the use of this device, when lubrication maintenance is required on the inside of the spindle structure, the maintenance personnel connect the external lubrication structure pipeline to the inside of the perfusion hole 41, and then drive the external lubrication structure pipeline to pour the lubricating grease into the perfusion hole 41. The lubricating grease is transported into the positioning bearing 5 area through the perfusion hole 41, and the lubricating grease drips toward the arc guide plate 6 area through the bottom of the perfusion hole 41. A one-way barrier valve 42 is installed in the middle area of ​​the perfusion hole 41. The one-way barrier valve 42 can effectively prevent the reverse flow of the lubricating grease in the perfusion hole 41, while reducing the entry of external gas, maintaining the viscosity of the lubricating grease, and helping to ensure the long-term use of the spindle structure;

[0041] When part of the lubricating grease drips toward the area of ​​the arc-shaped guide plate 6 through the bottom of the filling hole 41, the other part of the lubricating grease will pass through the gaps between the viscous balls 82 and directly drip onto the surface of the locating bearing 5, thereby directly lubricating the balls inside the locating bearing 5. The lubricating grease that has fallen on the surface of the arc-shaped guide plate 6 can flow into the area of ​​the viscous balls 82 through the guide grooves 81 on the surface of the ball barrier 8. Part of the lubricating grease will adhere to the area of ​​the viscous balls 82, so that the lubricating grease remains in the top area of ​​the locating bearing 5. In this way, the lubricating grease can drip intermittently during the use of the locating bearing 5, thereby ensuring long-term lubrication of the locating bearing 5 and improving the service life of the spindle structure.

[0042] When the narrow shaft 31 rotates rapidly, the movable inner ring 51 in the positioning bearing 5 rotates and generates heat due to friction. The heat generated by the narrow shaft 31 in the positioning bearing 5 area is in direct contact with the heat dissipation hole 11. A heat dissipation air film 12 is installed in the heat dissipation hole 11. The heat dissipation air film 12 allows the internal hot gas to adhere to the heat dissipation hole 11. When the external air contacts the heat dissipation air film 12, the heat stored in the heat dissipation air film 12 can be guided away, thereby realizing air-cooled heat dissipation in the heat dissipation hole 11 area, and avoiding overheating in the heat dissipation hole 11 area, affecting the service life of the lubricating grease, further ensuring the long-term lubrication of the positioning bearing 5, and improving the service life of the main shaft structure.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spindle structure for a CNC machining center, characterized by: The invention comprises a main shaft sleeve (1), a main rotating shaft rod (3) and an outer mounting plate (2), wherein the outer mounting plate (2) is mounted on both ends of the main shaft sleeve (1), a positioning bearing (5) is mounted inside the main shaft sleeve (1), the positioning bearing (5) is provided in two groups, a movable inner ring (51) is provided inside the positioning bearing (5), the main rotating shaft rod (3) is mounted on the inner wall of the movable inner ring (51), and the outer mounting plate (2) is connected to the main shaft sleeve (1); A main shaft rod rotation lubrication unit is provided in the locating bearing (5) area, and is used for providing long-term lubrication protection to the locating bearing (5) area, thereby improving the smooth rotation of the main shaft rod (3) portion in the locating bearing (5) area.

2. The spindle structure of a CNC machining center according to claim 1, characterized in that: The main shaft rod rotation lubrication unit comprises a guide portion, the guide portion comprises a docking turntable (4), the docking turntable (4) is mounted on the surface of the main shaft rod (3), and a perfusion hole (41) is provided on the surface of the docking turntable (4).

3. The spindle structure of a CNC machining center according to claim 2, characterized in that: The main shaft rod rotation lubrication unit includes an adsorption portion, the adsorption portion includes an outer ring frame (7), the outer ring frame (7) is installed on the surface of the positioning bearing (5), a ball retainer (71) is provided on the inner side of the outer ring frame (7), an arc guide plate (6) is provided on the surface of the main shaft rod (3) near the ball retainer (71), a ball blocking frame (8) is provided on the top of the arc guide plate (6), and viscous balls (82) are provided between the ball blocking frame (8) and the ball retainer (71), and the viscous balls (82) are arranged in a plurality of groups at intervals.

4. The spindle structure of a CNC machining center according to claim 3, characterized in that: The main rotating shaft rod (3) is composed of three sections. The main rotating shaft rod (3) includes a narrow shaft body (31) and a wide shaft body (32). The wide shaft body (32) is provided in two groups. The two groups of wide shaft bodies (32) are installed at both ends of the narrow shaft body (31). The narrow shaft body (31) is installed on the inner wall of the movable inner ring (51).

5. The spindle structure of a CNC machining center according to claim 4, characterized in that: The pouring hole (41) passes through the surface of the wide-face shaft body (32), and the pouring hole (41) faces the surface of the arc-shaped guide plate (6) and the positioning bearing (5). A one-way blocking valve (42) is installed in the inner cavity of the pouring hole (41).

6. The spindle structure of a CNC machining center according to claim 5, characterized in that: The inner side of the ball blocking frame (8) is provided with a guide groove (81), and the guide grooves (81) are arranged in a ring shape and are arranged in a plurality of groups.

7. The spindle structure of a CNC machining center according to claim 1, characterized in that: An airflow circulation heat conduction unit is provided on the surface of the main shaft sleeve (1).

8. The spindle structure of a CNC machining center according to claim 7, characterized in that: The airflow circulation heat conduction unit includes a heat dissipation air film (12), and the surface of the spindle sleeve (1) is provided with heat dissipation holes (11). The heat dissipation holes (11) are arranged in a ring shape and are arranged into several groups. One end of the heat dissipation holes (11) is connected to the positioning bearing (5) area.

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