Static pressure spindle of numerical control machine tool

Abstract

The utility model relates to the field of static pressure main shafts, in particular to a numerical control machine tool static pressure main shaft which comprises a shaft sleeve and a static pressure main shaft body, the circumferential face of the static pressure main shaft body is sleeved with the shaft sleeve, and the upper end and the lower end of the circumferential face of the shaft sleeve are provided with an oil inlet and an oil return opening respectively. A first oil inlet hopper is in threaded connection with the circumferential surface of the second oil inlet hopper, a connecting pipe is rotationally connected into the first oil inlet hopper, an annular pressing block is fixedly connected to the inner wall of the first oil inlet hopper, a filter cylinder is fixedly connected into the annular convex edge, and the filter cylinder is located in the second oil inlet hopper. Under the action of the filter cartridge, lubricating oil can be filtered before being introduced into the shaft sleeve, so that impurities contained in the lubricating oil are filtered out, the introduced lubricating oil is cleaner, and the problem that the static pressure main shaft body is seriously abraded due to the fact that the lubricating oil contains a large amount of impurities is not prone to occurring.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of static pressure main shaft, especially to a numerical control machine tool static pressure main shaft. BACKGROUND

[0002] Numerical control machine tools are developing towards super high speed and super precision, and the performance of the machine tool is determined by the main shaft, which is the core component of the numerical control machine tool. Static pressure main shafts are widely used in high speed and precision machine tools due to their excellent high speed performance, high damping, high rotation precision, high stiffness, small damping and long service life.

[0003] The existing static pressure main shaft, in order to reduce friction and make it run more smoothly, will directly pass lubricating oil into the static pressure main shaft and the shaft sleeve along the oil inlet. Since the lubricating oil is not filtered before being passed in, impurities in the lubricating oil can enter the shaft sleeve and the surface of the static pressure main shaft, which can easily accelerate the wear rate of the static pressure main shaft during operation. Therefore, a numerical control machine tool static pressure main shaft needs to be designed. SUMMARY

[0004] The utility model provides a numerical control machine tool static pressure main shaft which solves the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a numerical control machine tool static pressure main shaft, comprising a shaft sleeve and a static pressure main shaft body, the circumference of the static pressure main shaft body is sleeved with the shaft sleeve, and the shaft sleeve and the static pressure main shaft body are sealingly arranged, the upper and lower ends of the circumference of the shaft sleeve are respectively provided with an oil inlet and an oil return port, the upper and lower ends of the circumference of the shaft sleeve are respectively fixedly connected with an oil inlet pipe and an oil return pipe, the oil inlet pipe is located at the upper end of the oil inlet, the oil return pipe is located at the lower end of the oil return port, the upper end of the oil inlet pipe is fixedly connected with a second oil inlet hopper, the circumference of the second oil inlet hopper is threadedly connected with a first oil inlet hopper, the first oil inlet hopper is rotatably connected with a connecting pipe, the inner wall of the first oil inlet hopper is fixedly connected with an annular pressing block, the inside of the second oil inlet hopper is connected with a material ejecting assembly, and the upper end of the material ejecting assembly is placed with an annular convex edge, the annular pressing block is pressed on the upper end of the annular convex edge, the inside of the annular convex edge is fixedly connected with a filter cartridge, and the filter cartridge is located in the second oil inlet hopper.

[0006] Further, a plurality of annular oil guide grooves are arranged in the inside of the shaft sleeve, and the plurality of annular oil guide grooves are distributed around the static pressure main shaft body, and the oil inlet and the oil return port are in communication with the plurality of annular oil guide grooves.

[0007] Further, a sealing groove is arranged on the upper end surface of the second oil inlet hopper, a sealing ring is fixedly arranged in the inside of the sealing groove, and the annular pressing block is pressed on the upper end of the sealing ring.

[0008] Furthermore, the top material assembly includes an annular fixed plate, a first annular connecting plate, a second annular connecting plate, sliding rods, and springs. The annular fixed plate is fixedly connected to the inner wall of the second oil inlet hopper. The first annular connecting plate and the second annular connecting plate are respectively provided at the upper and lower ends of the annular fixed plate. The first annular connecting plate and the second annular connecting plate are both located inside the second oil inlet hopper and are slidably connected to the second oil inlet hopper. The first annular connecting plate and the second annular connecting plate are fixedly connected by multiple sliding rods. The multiple sliding rods all pass through the annular fixed plate and are slidably connected to the annular fixed plate. Springs are sleeved on the circumferential surface of the multiple sliding rods. One end of the spring is fixedly connected to the annular fixed plate, and the other end of the spring is fixedly connected to the second annular connecting plate.

[0009] Furthermore, a rotating sleeve is fixedly connected to the circumferential surface of the first oil inlet hopper, and the circumferential surface of the rotating sleeve is provided with multiple arc-shaped grooves.

[0010] Furthermore, the end face of the annular pressure block is a right-angled trapezoid.

[0011] This utility model has the following beneficial effects:

[0012] 1. Compared with the existing technology, this CNC machine tool hydrostatic spindle can filter the lubricating oil before it is introduced into the bushing by the action of the filter cartridge, so that the impurities contained in it are filtered out. In this way, the introduced lubricating oil is cleaner and is less likely to cause serious wear of the hydrostatic spindle body due to the high impurity content in the lubricating oil.

[0013] 2. Compared with the prior art, this hydrostatic spindle of a CNC machine tool, under the action of the ejector assembly, can lift the annular convex edge upward after the first oil inlet hopper is removed, so that it protrudes from the second oil inlet hopper, and thus drive the filter cartridge to protrude from the second oil inlet hopper, so that the filter cartridge can be taken out from the second oil inlet hopper for cleaning or replacement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a hydrostatic spindle for a CNC machine tool, as proposed in this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of a CNC machine tool hydrostatic spindle after a partial cross-section in the main view, as proposed in this utility model.

[0016] Figure 3 for Figure 2 A magnified structural diagram of A in the middle;

[0017] Figure 4 for Figure 2 A magnified structural diagram of B in the diagram.

[0018] Legend:

[0019] 1, bushing; 2, static pressure spindle main body; 3, oil inlet pipe; 4, second oil inlet; 5, first oil inlet; 6, connecting pipe; 7, oil return pipe; 8, oil return port; 9, annular oil guide groove; 10, oil inlet; 11, annular pressing block; 12, sealing ring; 13, annular fixing plate; 14, first annular connecting plate; 15, sliding rod; 16, filter cartridge; 17, spring; 18, second annular connecting plate; 19, annular flange. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical schemes and beneficial effects to be solved in the present application more clear and obvious, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0021] Reference Figures 1-4 The utility model provides a numerical control machine tool static pressure spindle, including bushing 1 and static pressure spindle main body 2, the circumference of static pressure spindle main body 2 is equipped with bushing 1, and bushing 1 is sealed with static pressure spindle main body 2 between arrangement, the upper and lower ends of bushing 1 circumference are set up oil inlet 10 and oil return port 8 respectively, the upper and lower ends of bushing 1 circumference are fixedly connected with oil inlet pipe 3 and oil return pipe 7 respectively, oil inlet pipe 3 is located in the upper end of oil inlet 10, oil return pipe 7 is located in the lower end of oil return port 8, the upper end of oil inlet pipe 3 is fixedly connected with second oil inlet 4, the circumference of second oil inlet 4 is screw thread connection with first oil inlet 5, the inside of first oil inlet 5 is rotatably connected with connecting pipe 6, the inner wall of first oil inlet 5 is fixedly connected with annular pressing block 11, the inside of second oil inlet 4 is connected with material pushing assembly, and the upper end of material pushing assembly is placed with annular flange 19, annular pressing block 11 is pressed in the upper end of annular flange 19, the inside of annular flange 19 is fixedly connected with filter cartridge 16, and filter cartridge 16 is located in second oil inlet 4.

[0022] In use, the filter cartridge 16 is directly placed into the second oil inlet hopper 4 before use, at which time the annular convex edge 19 connected with the filter cartridge 16 is completely pressed against the upper end of the material ejecting assembly, then the first oil inlet hopper 5 is installed at the upper end of the second oil inlet hopper 4, in the process of installation, the first oil inlet hopper 5 drives the annular pressing block 11 to gradually rotate and move downward, and gradually press the annular convex edge 19, until the annular pressing block 11 is pressed against the upper end of the second oil inlet hopper 4, the installation of the first oil inlet hopper 5 is completed, at this time, under the action of the annular pressing block 11, the annular convex edge 19 and the filter cartridge 16 are firmly pressed into the second oil inlet hopper 4, so that the filter cartridge 16 is stably positioned in the second oil inlet hopper 4 to play a role, then the lubricating oil enters along the connecting pipe 6 and the first oil inlet hopper 5, is first filtered under the action of the filter cartridge 16, then passes through the second oil inlet hopper 4 and the oil inlet pipe 3, and finally enters the shaft sleeve 1 from the oil inlet 10 to play a lubricating role on the surface of the static pressure spindle main body 2 in the shaft sleeve 1, since the lubricating oil has been filtered, the content of impurities in the lubricating oil is less, so that the lubricating oil that is introduced is cleaner, and the problem of serious wear of the static pressure spindle main body 2 caused by the high content of impurities in the lubricating oil is less likely to occur.

[0023] Further, a plurality of annular oil guide grooves 9 are formed in the shaft sleeve 1, and the plurality of annular oil guide grooves 9 are distributed around the static pressure spindle main body 2, and the oil inlet 10 and the oil return port 8 are in communication with the plurality of annular oil guide grooves 9.

[0024] In use, the lubricating oil entering from the oil inlet 10 flows along the annular oil guide grooves 9 and lubricates the circumferential surface of the static pressure spindle main body 2, and finally flows out through the oil return port 8, since the oil return port 8 of the static pressure spindle main body 2 is generally connected with an oil tank through an oil return pipe 7, the used oil is returned to the oil tank for recycling, therefore, the existence of the oil return port 8 can make the oil in the shaft sleeve 1 flow, the flowing oil can not only take away heat to play a cooling role, but also can take away the impurities and wear particles on the surface of the static pressure spindle main body 2 and in the shaft sleeve 1, thereby reducing the probability of wear of the static pressure spindle main body 2.

[0025] Further, as shown in Figure 3 , a sealing groove is formed in the upper end surface of the second oil inlet hopper 4, a sealing ring 12 is fixedly installed in the sealing groove, and the annular pressing block 11 is pressed against the upper end of the sealing ring 12.

[0026] Further, as shown in Figure 4As shown, the top material assembly comprises an annular fixed plate 13, a first annular connecting plate 14, a second annular connecting plate 18, a slide rod 15 and a spring 17, the inner wall of the second oil inlet hopper 4 is fixedly connected with the annular fixed plate 13, the upper and lower ends of the annular fixed plate 13 are respectively provided with the first annular connecting plate 14 and the second annular connecting plate 18, the first annular connecting plate 14 and the second annular connecting plate 18 are located in the second oil inlet hopper 4 and are both in sliding connection with the second oil inlet hopper 4, the first annular connecting plate 14 and the second annular connecting plate 18 are fixedly connected through the plurality of slide rods 15, the plurality of slide rods 15 all penetrate through the annular fixed plate 13 and are in sliding connection with the annular fixed plate 13, the circumferential surface of the plurality of slide rods 15 is all sleeved with the spring 17, one end of the spring 17 is fixedly connected with the annular fixed plate 13, and the other end of the spring 17 is fixedly connected with the second annular connecting plate 18.

[0027] When working, in the process of installing the first oil inlet hopper 5, the annular pressing block 11 will gradually press on the upper end of the annular convex edge 19 and extrude the annular convex edge 19 downward, at the same time, the annular convex edge 19 gradually presses the first annular connecting plate 14 downward, so that the first annular connecting plate 14 moves downward, and the second annular connecting plate 18 moves downward along the annular fixed plate 13 under the action of the slide rod 15, and the spring 17 is stretched, until the first oil inlet hopper 5 is installed, when the first oil inlet hopper 5 is disassembled, after the annular pressing block 11 no longer presses on the upper end of the annular convex edge 19 and the first annular connecting plate 14, the first annular connecting plate 14 will move upward and reset under the action of the spring 17 and the slide rod 15, thereby pushing the annular convex edge 19 to move upward and protrude from the second oil inlet hopper 4, so that the filter cartridge 16 moves upward and protrudes from the second oil inlet hopper 4, so as to facilitate subsequent removal of the filter cartridge 16.

[0028] Further, the circumferential surface of the first oil inlet hopper 5 is fixedly connected with a rotating sleeve, and a plurality of arc-shaped grooves are formed in the circumferential surface of the rotating sleeve. When working, under the cooperation of the rotating sleeve and the arc-shaped grooves, the first oil inlet hopper 5 is conveniently installed and disassembled manually.

[0029] Further, the end surface of the annular pressing block 11 is in the shape of a right trapezoid. When working, the inner upper end surface of such an annular pressing block 11 is an inclined surface, at this time, the lubricating oil entering through the first oil inlet hopper 5 can smoothly slide down along the annular pressing block 11 and is not easy to accumulate on the annular pressing block 11.

[0030] Working principle:

[0031] In use, the lubricating oil enters along the connecting pipe 6, the first oil inlet 5, the second oil inlet 4, the oil inlet pipe 3 and finally the oil inlet 10 into the shaft sleeve 1, and the entering lubricating oil flows along the annular oil guide groove 9 and the surface of the static pressure spindle body 2 and finally is discharged through the oil return port 8. Since the oil return port 8 of the static pressure spindle body 2 is generally connected with the oil tank through the oil return pipe 7 to return the used oil to the oil tank for recycling, the oil in the shaft sleeve 1 can flow due to the existence of the oil return port 8. The flowing oil can not only take away heat to reduce temperature, but also can take away the impurities and wear particles on the surface of the static pressure spindle body 2 and inside the shaft sleeve 1, thereby reducing the probability of wear of the static pressure spindle body 2. In the process of entering the lubricating oil, the lubricating oil can be filtered by the filter cartridge 16 before entering the shaft sleeve 1, so that the impurities in the lubricating oil are filtered out, and the entering lubricating oil is cleaner, and the problem of serious wear of the static pressure spindle body 2 due to the high impurity content in the lubricating oil is avoided.

[0032] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or replace some of the technical features with equivalent ones, as long as the modifications, replacements and improvements are within the spirit and principles of the present application.

Claims

1. Hydrostatic spindle for a numerically controlled machine tool, comprising a sleeve (1) and a hydrostatic spindle body (2), characterized in that: The circumferential surface of the static pressure spindle body (2) is sleeved with a shaft sleeve (1), and the shaft sleeve (1) and the static pressure spindle body (2) are sealingly arranged, the upper and lower ends of the circumferential surface of the shaft sleeve (1) are respectively provided with an oil inlet (10) and an oil return port (8), the upper and lower ends of the circumferential surface of the shaft sleeve (1) are respectively fixedly connected with an oil inlet pipe (3) and an oil return pipe (7), the oil inlet pipe (3) is located at the upper end of the oil inlet (10), the oil return pipe (7) is located at the lower end of the oil return port (8), the upper end of the oil inlet pipe (3) is fixedly connected with a second oil inlet hopper (4), the circumferential surface of the second oil inlet hopper (4) is threadedly connected with a first oil inlet hopper (5), the first oil inlet hopper (5) is rotatably connected with a connecting pipe (6) in the inside, the inner wall of the first oil inlet hopper (5) is fixedly connected with an annular pressing block (11), the inside of the second oil inlet hopper (4) is connected with a material ejecting assembly, and the upper end of the material ejecting assembly is placed with an annular convex edge (19), the annular pressing block (11) is pressed on the upper end of the annular convex edge (19), the inside of the annular convex edge (19) is fixedly connected with a filter cartridge (16), and the filter cartridge (16) is located in the second oil inlet hopper (4).

2. A hydrostatic spindle for a numerically controlled machine tool according to claim 1, characterized in that: A plurality of annular oil guide grooves (9) are arranged in the inside of the shaft sleeve (1), and the plurality of annular oil guide grooves (9) are distributed around the static pressure spindle body (2), and the oil inlet (10) and the oil return port (8) are in communication with the plurality of annular oil guide grooves (9).

3. A hydrostatic spindle for a numerically controlled machine tool according to claim 1, characterized in that: The upper end surface of the second oil inlet hopper (4) is provided with a sealing groove, the inside of the sealing groove is fixedly installed with a sealing ring (12), and the annular pressing block (11) is pressed on the upper end of the sealing ring (12).

4. A hydrostatic spindle for a numerically controlled machine tool according to claim 1, characterized in that: The material ejecting assembly comprises an annular fixed plate (13), a first annular connecting plate (14), a second annular connecting plate (18), a slide rod (15) and a spring (17), the inner wall of the second oil inlet hopper (4) is fixedly connected with the annular fixed plate (13), the upper and lower ends of the annular fixed plate (13) are respectively provided with the first annular connecting plate (14) and the second annular connecting plate (18), the first annular connecting plate (14) and the second annular connecting plate (18) are located in the second oil inlet hopper (4) and are slidably connected with the second oil inlet hopper (4), the first annular connecting plate (14) and the second annular connecting plate (18) are fixedly connected through a plurality of slide rods (15), the plurality of slide rods (15) all penetrate through the annular fixed plate (13) and are slidably connected with the annular fixed plate (13), the circumferential surface of the plurality of slide rods (15) is all sleeved with the spring (17), one end of the spring (17) is fixedly connected with the annular fixed plate (13), and the other end of the spring (17) is fixedly connected with the second annular connecting plate (18).

5. A hydrostatic spindle for a numerically controlled machine tool according to claim 1, characterized in that: The circumferential surface of the first oil inlet hopper (5) is fixedly connected with a rotating sleeve, and a plurality of arc grooves are arranged on the circumferential surface of the rotating sleeve.

6. A hydrostatic spindle for a numerically controlled machine tool according to claim 1, characterized in that: The end surface shape of the annular pressing block (11) is a right trapezoid.

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