Main shaft structure suitable for tool minimal quantity lubrication

Abstract

The main shaft structure comprises a main shaft, a piston, a screw plug, a sealing ring and a broach rod, the broach rod is arranged in the main shaft, a connecting sleeve arranged on the lower portion of the broach rod in a sleeved mode is arranged in the main shaft, the screw plug is arranged in the connecting sleeve and located at the bottom of the broach rod, and a sleeve located below the screw plug is arranged in the connecting sleeve. The piston is arranged in the sleeve and located below the sealing ring, the piston is provided with a core rod which is upward and extends into an inner hole of the broach rod, a first blind hole is formed in the top of the core rod in a concave mode, a first valve hole communicated with the first blind hole is formed in the outer circle of the core rod, and a second blind hole is formed in the bottom of the piston in a concave mode. A second valve hole communicated with the second blind hole is formed in the outer circle of the core rod. By means of the mode, the main shaft structure suitable for tool minimal quantity lubrication can meet the application requirement of minimal quantity lubrication cutting, and oil gas of minimal quantity lubrication can be automatically blocked after a tool is disassembled.

Description

Technical Field

[0001] The utility model relates to the field of machine tool spindles, in particular to a spindle structure suitable for minimal lubrication of cutting tools. Background Art

[0002] In the spindle structure of standard center-flow cutting, a check valve is required to control the water path. Traditional check valves consist of a spring and a steel ball structure forming a valve core structure, and the opening pressure is relatively high, generally above 20 bar.

[0003] To reduce the amount of cutting fluid used to a minimum, machine tools can use minimal lubrication (MQL). MQL pressure is relatively low, typically only 6 to 10 bar, which prevents the opening of traditional check valves, resulting in blockage of MQL oil and gas. Therefore, MQL operation does not allow for the presence of traditional check valves within the spindle.

[0004] In order to enable the spindle to meet the application of minimal lubrication cutting, the one-way valve can be removed. However, when the spindle changes the tool, it cannot automatically block the minimal lubrication oil and gas, which will cause oil and gas to pollute the air and harm human health, and needs to be improved. Utility Model Content

[0005] The main technical problem solved by the utility model is to provide a spindle structure suitable for minimal lubrication of cutting tools, meet the application of minimal lubrication cutting, and avoid the problem of oil and gas escape pollution when changing cutting tools.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a spindle structure suitable for minimal lubrication of cutting tools, including: a spindle, a piston, a screw plug, a sealing ring and a broaching rod, the broaching rod is arranged in the spindle, the spindle is provided with a connecting sleeve sleeved on the lower part of the broaching rod, the screw plug is arranged in the connecting sleeve and is located at the bottom of the broaching rod, the connecting sleeve is provided with a sleeve located below the screw plug, the sealing ring is arranged on the top of the sleeve and is located on the bottom surface of the screw plug, the piston is arranged in the sleeve and is located below the sealing ring, the The piston is provided with a core rod that passes through the sealing ring and the screw plug upward and extends to the inner hole of the broach rod. The top of the core rod is concavely provided with a first blind hole, and the outer circle of the core rod is provided with a first valve hole connected to the first blind hole. The bottom of the piston is concavely provided with a second blind hole that extends upward to the core rod and is located below the first blind hole. The outer circle of the core rod is provided with a second valve hole connected to the second blind hole. The screw plug is provided with a guide hole corresponding to the core rod, and the guide hole is concavely provided with an annular groove. After the core rod rises, the first valve hole and the second valve hole are simultaneously connected to the annular groove.

[0007] In a preferred embodiment of the present invention, after the core rod descends, the second valve hole is located in or below the sealing ring.

[0008] In a preferred embodiment of the present invention, the tool is installed at the bottom of the spindle.

[0009] In a preferred embodiment of the present invention, the tool is provided with an inner cooling rod extending upward through the sleeve, the top of the inner cooling rod contacts the bottom of the piston and forces the piston to move upward.

[0010] In a preferred embodiment of the present invention, a lubrication hole communicating with the second blind hole and the tool is provided in the inner cooling rod.

[0011] In a preferred embodiment of the present invention, a pressure relief hole communicating with the second blind hole is provided at the outer bottom of the core rod.

[0012] In a preferred embodiment of the present invention, the annular array of the first valve holes is distributed in the core rod and extends obliquely from the bottom of the first blind hole to the outside and downward.

[0013] In a preferred embodiment of the present invention, the second valve holes are distributed in an annular array in the core rod and extend obliquely from the top of the second blind hole toward the outside and upward.

[0014] The beneficial effects of the present invention are as follows: the present invention points out a spindle structure suitable for minimal lubrication of cutting tools. After the tool is installed, the inner cooling rod forces the piston to move upward, opening the oil and gas passage for minimal lubrication, which is convenient for meeting the application of minimal lubrication cutting. After the tool is disassembled, the piston moves downward with its own weight, automatically blocking the oil and gas for minimal lubrication, avoiding the problem of oil and gas escaping and polluting the air, and improving the protection of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0016] Figure 1 This is a structural diagram of a preferred embodiment of a spindle structure suitable for minimal lubrication of cutting tools in the utility model;

[0017] Figure 2 This is a structural diagram of a preferred embodiment of the utility model after the tool is installed on a spindle structure suitable for minimal lubrication of the tool;

[0018] Figure 3 yes Figure 2 A partial enlarged view of part A;

[0019] Figure 4 yes Figure 2Schematic diagram of the structure of the middle piston. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of 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 them. 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.

[0021] See also Figures 1 to 4 , the embodiments of the present utility model include:

[0022] like Figure 1 The spindle structure shown is suitable for minimal lubrication of tools, and performs minimal lubrication after the tool is installed, including: a spindle 1, a piston 5, a screw plug 3, a sealing ring 4 and a broaching rod 2. The broaching rod 2 is arranged in the spindle 1, and the spindle 1 is provided with a connecting sleeve 9 which is sleeved on the lower part of the broaching rod 2. The screw plug 3 is arranged in the connecting sleeve 9 and is located at the bottom of the broaching rod 2. The outer wall of the screw plug 3 is connected to the connecting sleeve 9 by a threaded manner, and the structure is stable.

[0023] A sleeve 6 is provided within the connecting sleeve 9 and is positioned below the screw plug 3. A sealing ring 4 is provided on top of the sleeve 6 and on the bottom surface of the screw plug 3, limiting the position of the sealing ring 4. A piston 5 is provided within the sleeve 6 and below the sealing ring 4. The piston 5 is provided with a core rod 51 that extends upward through the sealing ring 4 and the screw plug 3 and into the inner hole of the broaching rod 2. The piston 5 and core rod 51 are integrated into a structure that allows for synchronous lifting and lowering, resulting in high stability.

[0024] like Figure 3 and Figure 4 As shown, a first blind hole 52 is concavely provided at the top of the core rod 51 , and a first valve hole 53 communicating with the first blind hole 52 is provided on the outer circle of the core rod 51 . The minimally lubricated oil and gas in the inner hole of the broaching rod 2 enters the first valve hole 53 through the first blind hole 52 .

[0025] A second blind hole 55 is provided in the concave bottom of the piston 5, extending upward to the core rod 51 and located below the first blind hole 52. A second valve hole 54 connected to the second blind hole 55 is provided on the outer circle of the core rod 51. In this embodiment, 2 to 4 first valve holes 53 are distributed in a circular array in the core rod 51 and extend obliquely outward and downward from the bottom of the first blind hole 52. 2 to 4 second valve holes 54 are distributed in a circular array in the core rod 51 and extend obliquely outward and upward from the top of the second blind hole 55, which is conducive to reducing the distance between the first valve hole 53 and the second valve hole 54.

[0026] A guide hole corresponding to the core rod 51 is provided in the screw plug 3 to guide the lifting of the core rod 51. An annular groove 10 is provided in the guide hole. Figure 3As shown, after the core rod 51 rises, the first valve hole 53 and the second valve hole 54 are simultaneously connected to the annular groove 10 , so that the oil and gas in the first valve hole 53 enter the second valve hole 54 and the second blind hole 55 .

[0027] like Figure 4 As shown, the port position of the first valve hole 53 on the outer circle of the core rod 51 is higher than the port position of the second valve hole 54 on the outer circle of the core rod 51. Figure 3 As shown, at this time, the port positions of the first valve hole 53 and the second valve hole 54 on the outer circle of the core rod 51 are simultaneously located in the annular groove 10, opening the oil and gas passage.

[0028] like Figure 1 As shown, after the tool 8 is disassembled, the piston 5 moves downward and resets under the action of its own weight. After the core rod 51 descends, the second valve hole 54 is located in the sealing ring 4 or below the sealing ring 4, automatically blocking the minimally lubricated oil and gas to avoid the problem of oil and gas escaping and polluting the air.

[0029] like Figure 2 As shown, tool 8 is mounted at the bottom of spindle 1. Tool 8 is equipped with an internal coolant rod 7 extending upward through sleeve 6. The top of internal coolant rod 7 contacts the bottom of piston 5, forcing piston 5 upward and opening the oil and gas passage for minimal lubrication. A pressure relief hole 56 is provided at the bottom of the outer circumference of core rod 51, connected to a second blind hole 55. During the upward movement of piston 5, gas above piston 5 can enter the second blind hole 55 through pressure relief hole 56 and be discharged, ensuring smooth upward movement of piston 5.

[0030] like Figure 3 As shown, in this embodiment, a lubrication hole connecting the second blind hole 55 and the tool 8 is provided in the inner cooling rod 7. The lubrication hole allows the oil and gas in the second blind hole 55 to enter the air hole in the tool 8 for minimal lubrication.

[0031] In summary, the utility model points out a spindle structure suitable for micro-lubrication of tools, which realizes the application of micro-lubrication, ensures that the spindle structure can meet the generation of micro-lubrication oil mist, ensures the lubrication and cooling of tools and processed parts, and automatically blocks the micro-lubrication oil and gas through the disassembly of the tool, avoiding the leakage of oil and gas when replacing the tool, thereby improving the convenience and safety of use.

[0032] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spindle structure suitable for tool micro-lubrication, which performs micro-lubrication after the tool is installed, characterized in that: include: The main shaft, piston, screw plug, sealing ring and broaching rod, the broaching rod is arranged in the main shaft, the main shaft is provided with a connecting sleeve sleeved on the lower part of the broaching rod, the screw plug is arranged in the connecting sleeve and is located at the bottom of the broaching rod, the connecting sleeve is provided with a sleeve located below the screw plug, the sealing ring is arranged at the top of the sleeve and is located at the bottom of the screw plug, the piston is arranged in the sleeve and is located below the sealing ring, the piston is provided with a core rod that upwardly penetrates the sealing ring and the screw plug and extends into the inner hole of the broaching rod, the top of the core rod is concavely provided with a first blind hole, the outer circle of the core rod is provided with a first valve hole connected to the first blind hole, the bottom of the piston is concavely provided with a second blind hole extending upward to the core rod and located below the first blind hole, the outer circle of the core rod is provided with a second valve hole connected to the second blind hole, the screw plug is provided with a guide hole corresponding to the core rod, and the guide hole is concavely provided with an annular groove. After the core rod rises, the first valve hole and the second valve hole are simultaneously connected to the annular groove.

2. The spindle structure suitable for minimal lubrication of cutting tools according to claim 1, characterized in that: After the core rod descends, the second valve hole is located in or below the sealing ring.

3. The spindle structure suitable for minimal lubrication of cutting tools according to claim 1, characterized in that: The tool is mounted on the bottom of the spindle.

4. The spindle structure suitable for minimal lubrication of cutting tools according to claim 3, characterized in that: The cutter is provided with an inner cooling rod which extends upward through the sleeve. The top of the inner cooling rod contacts the bottom of the piston and forces the piston to move upward.

5. The spindle structure suitable for minimal lubrication of cutting tools according to claim 4, characterized in that: The inner cooling rod is provided with a lubrication hole communicating with the second blind hole and the tool.

6. The spindle structure suitable for minimal lubrication of cutting tools according to claim 1, characterized in that: The outer bottom of the core rod is provided with a pressure relief hole communicated with the second blind hole.

7. The spindle structure suitable for minimal lubrication of cutting tools according to claim 1, characterized in that: The first valve hole annular array is distributed in the core rod and extends obliquely from the bottom of the first blind hole toward the outside and downward.

8. The spindle structure suitable for minimal lubrication of cutting tools according to claim 1, characterized in that: The second valve hole annular array is distributed in the core rod and extends obliquely from the top of the second blind hole toward the outside and upward.

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