Main shaft sealing structure of gantry boring and milling machining center

Abstract

The utility model relates to the technical field of numerical control machinery, and particularly discloses a gantry boring and milling machining center main shaft sealing structure which comprises a static ring seat and a movable ring seat, an outer end sealing ring used for sealing the joint of the movable ring seat and a main shaft is embedded in an outer port of the movable ring seat, and a lip-shaped limiting ring is arranged at the outer end of the static ring seat. An annular groove used for containing the lip-shaped limiting ring is formed in the inner end of the movable ring seat, an inner layer sealing piece connected with the annular groove in an embedded mode is arranged at the end of an inner ring of the lip-shaped limiting ring, a positioning ring coaxially connected with an inner ring of the shaft sleeve in an internally tangent mode is arranged on an inner ring of the inner end of the static ring seat, and an inner end sealing ring is installed at the connecting position of the positioning ring and the shaft sleeve. The problems that a traditional main shaft seal adopts a contact type sealing structure of a dynamic friction pair, heat is easily generated, the heat stability of a main shaft is influenced, and the heat balance and the structural precision of the main shaft are influenced are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of numerical control machines, and discloses a main shaft sealing structure of a gantry boring and milling machining center. BACKGROUND

[0002] A numerical control machine mainly comprises a numerical control system, a main shaft, a motor, a driver, a screw rod, a guide rail, a tool magazine, a swing head and a rotary table and the like functional components, and the functional components serve as unit technical carriers of the numerical control machine and determine the performance level of the numerical control machine as a whole. The gantry boring and milling machining center, also known as a gantry boring and milling machine, is a numerical control machine capable of boring and milling and is mainly used for machining various complex parts and can complete the machining of multiple processes in one clamping.

[0003] The main shaft of the machine tool is generally installed through a headstock case of the machine tool and extends to the outside of the headstock case, so that the connecting part of the main shaft and the headstock case needs to be sealed to prevent the lubricating oil sprayed or splashed in the headstock case from entering the bearing cavity of the main shaft.

[0004] The main shaft of the existing machine tool is usually provided with a contact type sealing structure such as an O-shaped sealing ring, a lip-shaped elastic sealing ring and a complex mechanical seal installed at the connecting end of the main shaft and the shaft sleeve. However, the contact type sealing structure is a dynamic friction pair, which not only generates heat and affects the thermal stability of the main shaft, but also causes the air in the bearing cavity to be difficult to cool and the internal and external pressures to be difficult to balance due to the heat generated by the rolling of the bearing, thereby affecting the thermal balance of the main shaft. The imbalance of the internal and external pressures of the bearing cavity causes the deformation of the contact surface of the dynamic friction pair and affects the sealing effect, and the dynamic friction pair also causes the service life to be greatly reduced and vibration to be caused in the case of poor lubrication, which seriously affects the reliability of the sealing and the precision of the main shaft. Therefore, the inventor provides a main shaft sealing structure of a gantry boring and milling machining center to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at solving the problems that the traditional main shaft sealing adopts a contact type sealing structure of a dynamic friction pair, heat is easily generated and the thermal stability of the main shaft is affected, the thermal balance and the structural precision of the main shaft are affected.

[0006] In order to achieve the above object, the utility model discloses a basic scheme provides a gantry boring and milling machining center main shaft sealing structure, including coaxial sleeve installation in the lateral of main shaft and with the detachable connection of the end of axle sleeve static ring seat and sleeve installation in the lateral of main shaft and with the rotary connection of static ring seat dynamic ring seat, the outer port of dynamic ring seat is embedded with the outer end sealing ring for the sealing of the connecting place of dynamic ring seat and main shaft, the outer end of static ring seat is equipped with the lip limit ring, the inner end of dynamic ring seat is equipped with the annular groove for accommodating the lip limit ring, the inner circle end of lip limit ring is equipped with the inner layer sealing element with the embedding of annular groove, the inner circle of the inner end of static ring seat is equipped with the positioning ring with the coaxial incircle connection of axle sleeve, and the connecting place of positioning ring and axle sleeve is installed with inner end sealing ring.

[0007] The principle and effect of the basic scheme are that:

[0008] 1、Compared with the prior art, the utility model discloses a dynamic ring seat and static ring seat cooperation non-contact type sealing mode between main shaft and axle sleeve, and its sealing channel is composed of rotary connection lip limit ring and annular groove, is arranged in the form perpendicular to the axial direction of main shaft, not only guarantees the sealing effect of main shaft, and reserves enough sealing channel length, but also compared with the traditional contact type sealing structure, reduces the width of sealing structure arranged in the axial direction of main shaft, further reduces the space occupied in the axial direction of main shaft, simultaneously, the sealing channel formed by dynamic ring seat and static ring seat makes the lubricating oil of gear transmission difficult to flow in under the rotation and static state of main shaft, and further seals the inside of the sealing channel formed by dynamic ring seat and static ring seat through the setting inner layer sealing element, so that the overall sealing effect is better, solves the problem that the traditional main shaft sealing adopts contact type sealing structure of dynamic friction pair, is easy to produce heat and influences the thermal stability of main shaft, influences the thermal balance and structural precision of main shaft.

[0009] Further, the inner layer sealing element includes a first elastic sealing ring disposed on the inner side of the inner circle of the lip limit ring and a second elastic sealing ring disposed on the outer side of the inner circle of the lip limit ring, and the first elastic sealing ring and the second elastic sealing ring respectively abut against the inner wall of the annular groove. By providing the first elastic sealing ring and the second elastic sealing ring, the connection between the lip limit ring and the annular groove can be further sealed, thereby improving the sealing effect of the main shaft. Moreover, the use of elastic structure facilitates disassembly and assembly, and allows the inner layer sealing element to be adapted and sealed according to the width of the annular groove.

[0010] Further, the outer end face of the dynamic ring seat is provided with a right-angled ring groove, and the outer end sealing ring is a right-angled ring. The outer end sealing ring is detachably embedded in the right-angled ring groove. By using the right-angled ring groove, the installation and fixation of the outer end sealing ring are facilitated without affecting the sealing effect of the main shaft.

[0011] Further, the bottom end of the static ring seat is uniformly provided with a plurality of positioning through holes, the end of the shaft sleeve is uniformly provided with a plurality of positioning threaded holes, and the positioning through holes and the positioning threaded holes are threadedly detachably connected by positioning screws. The connection between the structures is more compact by the connection and fixation between the positioning screws and the positioning through holes and the positioning threaded holes, and the stability of the structure is improved.

[0012] Further, the inner end sealing ring is a rubber gasket, the bottom end of the static ring seat is provided with a positioning groove located outside the positioning ring, and the inner end sealing ring is detachably embeddedly installed in the positioning groove. The connection between the static ring seat and the shaft sleeve is sealed by the rubber gasket, and the contact type sealing is adopted between the two static structures, so that the sealing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 The overall structure schematic diagram of a gantry boring and milling machining center spindle sealing structure is shown.

[0015] Figure 2 The enlarged view of the A part structure in the figure is shown. Figure 1 DETAILED DESCRIPTION

[0016] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the present application will be described in detail below with reference to the drawings and preferred embodiments.

[0017] The reference signs in the drawings of the specification include: spindle 1, shaft sleeve 2, static ring seat 3, dynamic ring seat 4, outer end sealing ring 5, lip-shaped limiting ring 6, annular groove 7, positioning ring 8, inner end sealing ring 9, first elastic sealing ring 10, second elastic sealing ring 11, right-angle ring groove 12, positioning screw 13, positioning groove 14.

[0018] A gantry boring and milling machining center spindle sealing structure, the embodiment is as follows Figure 1 ​As shown: It includes a stationary ring seat 3 coaxially sleeved 2 and mounted on the periphery of the main shaft 1 and detachably connected to the end of the sleeve 2, and a moving ring seat 4 sleeved on the periphery of the main shaft 1 and rotatably connected to the stationary ring seat 3. The outer port of the moving ring seat 4 is fitted with an outer end sealing ring 5 for sealing the connection between the moving ring seat 4 and the main shaft 1. The outer end of the stationary ring seat 3 is provided with a lip-shaped limiting ring 6. The inner end of the moving ring seat 4 is provided with an annular groove 7 for accommodating the lip-shaped limiting ring 6. The inner end of the lip-shaped limiting ring 6 is provided with an inner layer sealing element that fits into the annular groove 7. The inner end of the stationary ring seat 3 is provided with a positioning ring 8 coaxially and internally connected to the inner ring of the sleeve 2. An inner end sealing ring 9 is installed at the connection between the positioning ring 8 and the sleeve 2.

[0019] Among them, such as Figure 2 As shown, the inner sealing element includes a first elastic sealing ring 10 disposed on the inner side of the inner ring of the lip-shaped limiting ring 6 and a second elastic sealing ring 11 disposed on the outer side of the inner ring of the lip-shaped limiting ring 6. The first elastic sealing ring 10 and the second elastic sealing ring 11 respectively abut against the inner wall of the annular groove 7.

[0020] Among them, such as Figure 1 As shown, the outer end face of the moving ring seat 4 is provided with a right-angled annular groove 12, and the outer end sealing ring 5 is a right-angled ring. The outer end sealing ring 5 and the right-angled annular groove 12 can be detachably embedded and installed.

[0021] Among them, such as Figure 1 As shown, the bottom end of the stationary ring seat 3 is provided with five positioning through holes evenly, and the end of the bushing 2 is provided with five positioning threaded holes evenly. Each pair of positioning through holes and positioning threaded holes is detachably connected by positioning screws 13.

[0022] Among them, such as Figure 1 As shown, the inner end sealing ring 9 is a rubber gasket, and the bottom end of the stationary ring seat 3 is provided with a positioning groove 14 located on the outside of the positioning ring 8. The inner end sealing ring 9 and the positioning groove 14 can be detachably embedded and installed.

[0023] In the specific implementation process of the utility model, first, the inner end sealing ring 9 is inlaid and installed in the positioning groove 14, then the static ring seat 3 is inserted from the end where the main shaft 1 ends, so that the static ring seat 3 is sleeved on the outside of the main shaft 1, then the positioning through hole at the bottom end of the static ring seat 3 is installed in correspondence with the positioning screw hole at the end of the shaft sleeve 2, and the two are fastened and connected by using the positioning screw 13, the inner end sealing ring 9 resists the thread pre-tightening force when the static ring seat 3 and the shaft sleeve 2 are reinforced by the positioning screw 13, and then the sealing protection of the installation gap between the static ring seat 3 and the shaft sleeve 2 is achieved. Subsequently, the dynamic ring seat 4 is inserted from the end where the main shaft 1 ends, and the annular groove 7 is inlaid and installed from the top end of the lip-shaped limiting ring 6. In this installation process, the first elastic sealing ring 10 and the second elastic sealing ring 11 are compressed and deformed towards the inside where the lip-shaped limiting ring 6 is located along with the installation of the annular groove 7 of the dynamic ring seat 4 to the lip-shaped limiting ring 6 of the static ring seat 3, and after the lip-shaped limiting ring 6 is completely contained in the annular groove 7, the first elastic sealing ring 10 and the second elastic sealing ring 11 are reversely resilient to the outside, and continuously abut against the inner wall of the annular groove 7, so as to achieve the sealing protection of the installation gap between the static ring seat 3 and the dynamic ring seat 4. Finally, the outer end sealing ring 5 is inlaid in the right-angle ring groove 12 to seal the connection between the dynamic ring seat 4 and the main shaft 1.

[0024] Compared with the prior art, the utility model adopts the non-contact sealing mode of the dynamic ring seat 4 and the static ring seat 3 between the main shaft 1 and the shaft sleeve 2, the sealing channel is composed of the lip-shaped limiting ring 6 and the annular groove 7 in rotational connection, and is arranged in the form of being perpendicular to the axial direction of the main shaft 1, which not only ensures the sealing effect of the main shaft 1 and reserves sufficient sealing channel length, but also reduces the width of the sealing structure arranged in the axial direction of the main shaft 1 compared with the traditional contact sealing structure, thereby reducing the space occupied in the axial direction of the main shaft 1. Meanwhile, the sealing channel formed by the dynamic ring seat 4 and the static ring seat 3 makes it difficult for the lubricating oil of the gear transmission to flow in under the rotating and static state of the main shaft 1, and the inner part of the sealing channel formed by the dynamic ring seat 4 and the static ring seat 3 is further sealed by arranging the inner sealing element, so that the overall sealing effect is better, and the problem that the traditional main shaft sealing adopts the contact sealing structure of the dynamic friction pair, which is easy to generate heat and affects the thermal stability, thermal balance and structural precision of the main shaft is solved.

[0025] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A gantry boring and milling machining center spindle sealing structure, characterized in that: The static ring seat is coaxially sleeved on the periphery of the main shaft and detachably connected with the end of the shaft sleeve, and the dynamic ring seat is sleeved on the periphery of the main shaft and rotatably connected with the static ring seat, an outer end of the dynamic ring seat is embedded with an outer end sealing ring for sealing the connection between the dynamic ring seat and the main shaft, the outer end of the static ring seat is provided with a lip-shaped limiting ring, the inner end of the dynamic ring seat is provided with an annular groove for accommodating the lip-shaped limiting ring, the inner circle end of the lip-shaped limiting ring is provided with an inner layer sealing element embedded with the annular groove, the inner circle of the inner end of the static ring seat is provided with a positioning ring coaxially inscribed connected with the inner circle of the shaft sleeve, and an inner end sealing ring is mounted at the connection between the positioning ring and the shaft sleeve. The inner layer sealing element comprises a first elastic sealing ring arranged on the inner side of the inner circle of the lip-shaped limiting ring and a second elastic sealing ring arranged on the outer side of the inner circle of the lip-shaped limiting ring, and the first elastic sealing ring and the second elastic sealing ring are respectively abutted against the inner wall of the annular groove.

2. The main shaft sealing structure of a gantry boring and milling machining center according to claim 1, characterized in that, The outer end surface of the dynamic ring seat is provided with a right-angled ring groove, the outer end sealing ring is right-angled annular, and the outer end sealing ring is detachably embedded with the right-angled ring groove.

3. The main shaft sealing structure of a gantry boring and milling machining center according to claim 1, characterized in that, The bottom end of the static ring seat is uniformly provided with a plurality of positioning through holes, the end of the shaft sleeve is uniformly provided with a plurality of positioning threaded holes, and the positioning through holes and the positioning threaded holes are detachably connected through positioning screws.

4. The main shaft sealing structure of a gantry boring and milling machining center according to claim 3, characterized in that, The inner end sealing ring is a rubber gasket, the bottom end of the static ring seat is provided with a positioning groove located on the outer side of the positioning ring, and the inner end sealing ring is detachably embedded with the positioning groove.

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