A spindle integrating center water outlet and air tightness detection functions

Abstract

The utility model discloses a kind of main shafts of integration center water outlet and air tightness detection function, including main shaft body, hollow pull rod, solid pull rod, hollow oil cylinder, double-channel rotary joint and chuck, the main shaft body two ends are respectively provided with hollow oil cylinder and chuck, the hollow pull rod two ends are respectively connected with hollow oil cylinder and chuck inside, the solid pull rod one end passes through hollow oil cylinder and is sealingly connected with double-channel rotary joint, the other end is set in the central hole of chuck, the waterway and gas path are set in the inside of solid pull rod, the waterway and gas path one end are set in the central hole one side of chuck, the other end is sealingly connected with double-channel rotary joint. The utility model can let cooling liquid pass through waterway accurate arrival cutting area, can accurate cooling, reduce cutting resistance, and discharge chip in time, gas reaches specified area by gas path, so that it completes air tightness detection inside equipment, improves processing precision.

Description

Technical Field

[0001] This utility model relates to the field of machine tool equipment technology, specifically to a spindle that integrates center water outlet and airtightness detection functions. Background Technology

[0002] With the continuous development of market technology, the manufacturing industry is constantly seeing the emergence of various new materials and processing techniques. As a foundation of manufacturing, the machine tool industry also needs to add more technology and functions to adapt to these developments. During deep hole drilling and deep cavity milling on machine tools, external coolant may struggle to reach the cutting zone. When machining materials such as stainless steel, titanium alloys, and high-temperature alloys, the cutting temperature is extremely high, and tool wear is rapid. During high-speed milling and tapping on horizontal machine tools, traditional coolant is easily thrown away by centrifugal force. Furthermore, in automated and unmanned production lines, workpiece sealing and clamping positioning are crucial. If iron filings generated during horizontal machine tool processing are not thoroughly cleaned, it can cause clamping errors, affecting machining accuracy and even damaging the parts. In high-precision machining applications, such as the machining of aerospace components, even minor clamping errors or sealing problems can affect product performance. Such issues are constantly emerging.

[0003] Traditional CNC lathe spindles lack central cooling outlets and fixture-based airtightness checks. Their core drawbacks include limited machining scenarios: when machining deep holes or long shafts, external coolant cannot reach the cutting zone, causing chips to accumulate inside the hole, leading to tool breakage and scratches on the workpiece's inner wall; accuracy is difficult to guarantee, as excessively high temperatures in the cutting zone can cause workpiece thermal deformation and dimensional deviations; residual chips can easily trigger "secondary cutting," reducing the workpiece's surface finish and failing to meet the machining requirements of high-precision parts; and they rely on manual intervention, requiring manual shutdown to clean chips from inside the hole, especially... During batch processing, frequent downtime disrupts the production rhythm and makes it unsuitable for continuous production scenarios. The lack of airtightness testing for fixtures easily leads to scrap, and the accuracy of workpiece clamping is entirely determined by manual judgment. If there is a positioning deviation or residual iron filings in the fixture, the workpiece is prone to dimensional deviations and shape deformation after processing, directly resulting in a higher scrap rate. The fixture and workpiece suffer significant wear and tear. If residual iron filings in the fixture are not detected and removed, they will scratch the workpiece positioning surface and the fixture reference surface during clamping. Over time, this will lead to fixture accuracy failure and increase the cost of fixture maintenance and replacement. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a main shaft that integrates central water outlet and airtightness detection functions.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A spindle integrating central water outlet and air tightness detection functions includes a spindle body, a hollow tie rod, a solid tie rod, a hollow hydraulic cylinder, a dual-channel rotary joint, and a chuck. The spindle body has a hollow hydraulic cylinder and a chuck at both ends. The spindle body also contains a hollow tie rod, with both ends connected to the hollow hydraulic cylinder and the chuck, respectively. A solid tie rod is located inside the hollow tie rod; one end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the dual-channel rotary joint, while the other end is located in the central hole of the chuck. The solid tie rod contains water and air passages, one end of which is located on one side of the central hole of the chuck, and the other end is sealed to the dual-channel rotary joint.

[0007] Furthermore, the spindle body is located inside the machine head, and one end of the outer wall of the spindle body is fixedly connected to the second connecting plate via a center key, while the other end of the outer wall is fixedly connected to the outside of the chuck.

[0008] Furthermore, the two ends of the hollow tie rod are respectively fixedly connected to the piston rod inside the hollow hydraulic cylinder and the gripper power assembly inside the chuck.

[0009] Furthermore, one end of the hollow hydraulic cylinder is fixedly connected to the second connecting plate, and the other end is fixedly connected to the first connecting plate. The upper part of one end of the hollow hydraulic cylinder is connected to the first bracket, and the lower part is connected to the second bracket.

[0010] Furthermore, the first bracket has a cover plate on its upper part, and a sensor is installed on the cover plate.

[0011] Furthermore, one end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the first connecting plate, while the other end is fixedly connected to the center hole inside the chuck.

[0012] Furthermore, one end of the water and air passages is sealed to the water pump interface channel and air source interface channel inside the dual-channel rotary joint, and the other end is sealed to the water and air extension pipes inside the chuck. A first O-ring is provided at the solid pull rod and the first connecting plate, and a second O-ring is provided at the groove of the solid pull rod and the hollow pull rod.

[0013] Furthermore, one end of the dual-channel rotary joint is fixedly connected to the first connecting plate, and the dual-channel rotary joint is provided with an air source interface and a water pump interface.

[0014] The beneficial effects of this utility model are:

[0015] This invention provides a spindle that integrates central water outlet and airtightness detection functions. A dual-channel rotary joint delivers gas and coolant to corresponding air and water channels inside a solid tie rod. Through the coordinated operation of a hollow hydraulic cylinder, hollow tie rod, solid tie rod, and chuck, the coolant precisely reaches the cutting zone via the water channel, while the central water outlet provides precise cooling, reducing the hardened layer formed by high temperatures and lowering cutting resistance, thus increasing tool life by over 30%. The central water outlet also promptly removes cutting debris, reducing manual intervention. Simultaneously, gas reaches designated areas via the air channel to perform internal airtightness testing, improving machining accuracy. This design also adapts to automated production, reducing scrap rates and costs. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of a main shaft that integrates central water outlet and air tightness detection functions in an embodiment of this utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of a main shaft that integrates central water outlet and airtightness detection functions in an embodiment of this utility model.

[0018] Figure 3 This is a partially enlarged structural diagram of the dual-channel rotary joint and the hollow hydraulic cylinder;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of a solid workpiece machined by a chuck;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of a hollow workpiece machined by a chuck;

[0021] Figure 6 This is a schematic diagram of the chuck's three-dimensional structure;

[0022] Figure 7 This is a schematic diagram of the cross-sectional structure of the chuck;

[0023] The following are the labeling details in the diagram: 1. Dual-channel rotary joint; 2. First connecting plate; 3. First bracket; 4. Sensor; 5. Cover plate; 6. Second bracket; 7. Hollow hydraulic cylinder; 8. Second connecting plate; 9. Intermediate key; 10. Hollow tie rod; 11. Solid tie rod; 12. Spindle body; 13. First O-ring; 14. Head; 15. Second O-ring; 16. Water pump interface; 17. Air source interface; 18. Air passage; 19. Water passage; 20. Adapter tie rod; 21. Water passage extension pipe; 22. Air passage extension pipe; 23. Chuck; 24. Pressure chamber; 25. Auxiliary sealing component; 26. Solid machined part; 27. Hollow machined part. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1-7 As shown, a spindle integrating central water outlet and airtightness detection functions includes a spindle body 12, a hollow tie rod 10, a solid tie rod 11, a hollow hydraulic cylinder 7, a dual-channel rotary joint 1, and a chuck 23. The hollow hydraulic cylinder and chuck are respectively installed at both ends of the spindle body. A hollow tie rod is also installed inside the spindle body, with both ends connected to the hollow hydraulic cylinder and the chuck, respectively. A solid tie rod is installed inside the hollow tie rod; one end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the dual-channel rotary joint, while the other end is located in the center hole of the chuck. Inside, the solid tie rod is equipped with water channels 19 and air channels 18, effectively separating the water and air channels. One end of each water and air channel is located on one side of the center hole of the chuck, and the other end is sealed to a dual-channel rotary joint to prevent liquid and gas leakage at the mechanical connection. This allows the coolant to accurately reach the cutting zone through the water channel for precise cooling, reducing cutting resistance and timely removal of cutting debris. At the same time, the gas reaches the designated area through the air channel to complete the airtightness test inside the equipment, improving machining accuracy and reducing scrap rate and cost. The hollow hydraulic cylinder drives the hollow tie rod to extend and retract through its movement. The tie rod drives the chuck to clamp or release the workpiece. During the machining of the solid workpiece 26, the chuck must be equipped with an auxiliary sealing component 25 in advance. The chuck clamps the solid workpiece, and the solid workpiece is in close contact with the air hole of the auxiliary sealing component. At the same time, the air pump inputs gas into the air path of the solid tie rod through the air source interface 17 of the dual-channel rotary joint. The gas is accurately delivered into the pressure chamber 24 through the air path channel of the solid tie rod. The pressure chamber forces the gas into the air hole of the auxiliary sealing component. The pressure is used to test the air tightness of the solid workpiece, which improves the machining accuracy and is compatible with automated production, reducing the scrap rate and cost.

[0026] During the machining of hollow workpiece 27, the chuck clamps the hollow workpiece. At the same time, the water pump inputs coolant into the water circuit of the solid tie rod through the water pump interface 16 of the double-channel rotary joint. The coolant accurately reaches the cutting zone through the water circuit of the solid tie rod. The center water outlet can accurately cool down the material, reduce the hardened layer caused by high temperature, and reduce cutting resistance, thereby increasing tool life by more than 30%. The center water outlet can also remove cutting chips in time, reducing manual intervention.

[0027] The spindle body is located inside the machine head 14, and a second connecting plate 8 is provided at one end. The second connecting plate is connected to the outer wall of the spindle body through a center key 9. The center key connection is easy to install and remove and has a relatively high load-bearing capacity.

[0028] A hollow tie rod is installed inside the main shaft body. Both ends of the hollow tie rod are fixedly connected to the piston rod inside the hollow hydraulic cylinder and the gripper power assembly inside the chuck, respectively. One end of the hollow hydraulic cylinder is fixedly connected to the second connecting plate, and the other end is fixedly connected to the first connecting plate 2. The upper part of the outer end of the hollow hydraulic cylinder is connected to the first bracket 3, and the lower part is connected to the second bracket 6. The fixed connection plate effectively increases the stability of the hollow hydraulic cylinder. The upper part of the first bracket is provided with a cover plate 5, and a sensor 4 is provided on the cover plate. The sensor can effectively locate the extension distance of the hollow hydraulic cylinder.

[0029] One end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the first connecting plate. The other end is fixedly connected to the center hole inside the chuck. The solid tie rod has a water passage and an air passage inside. One end of the water passage and the air passage are sealed to the water pump interface 16 and the air source interface 17 inside the dual-channel rotary joint. The other end is sealed to the water passage extension pipe 21 and the air passage extension pipe 22 inside the chuck. A first O-ring 13 is provided at the solid tie rod and the first connecting plate. A second O-ring 15 is provided at the groove of the solid tie rod and the hollow tie rod. The sealed connection and the O-ring setting can effectively prevent liquid and gas leakage.

[0030] One end of the dual-channel rotary joint is fixedly connected to the first connecting plate, and the dual-channel rotary joint is equipped with an air source interface and a water pump interface. The fixed connecting plate effectively increases the stability of the dual-channel rotary joint.

[0031] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A spindle integrating central water outlet and airtightness detection functions, characterized in that, The device includes a spindle body, a hollow tie rod, a solid tie rod, a hollow hydraulic cylinder, a dual-channel rotary joint, and a chuck. The spindle body has a hollow hydraulic cylinder and a chuck at both ends. The spindle body also contains a hollow tie rod, with both ends connected to the hollow hydraulic cylinder and the chuck, respectively. A solid tie rod is located inside the hollow tie rod; one end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the dual-channel rotary joint, while the other end is located in the center hole of the chuck. The solid tie rod contains water and air passages; one end of each water and air passage is located on one side of the center hole of the chuck, and the other end is sealed to the dual-channel rotary joint.

2. The spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, The spindle body is located inside the machine head. One end of the outer wall of the spindle body is fixedly connected to the second connecting plate via a center key, and the other end of the outer wall is fixedly connected to the outside of the chuck.

3. A spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, The two ends of the hollow tie rod are respectively fixedly connected to the piston rod inside the hollow hydraulic cylinder and the gripper power assembly inside the chuck.

4. A spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, One end of the hollow hydraulic cylinder is fixedly connected to the second connecting plate, and the other end is fixedly connected to the first connecting plate. The upper part of one end of the hollow hydraulic cylinder is connected to the first bracket, and the lower part is connected to the second bracket.

5. A spindle integrating central water outlet and airtightness detection functions as described in claim 4, characterized in that, The first bracket has a cover plate on its upper part, and a sensor is installed on the cover plate.

6. A spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, One end of the solid tie rod passes through the hollow hydraulic cylinder and is sealed to the first connecting plate, while the other end is fixedly connected to the center hole inside the chuck.

7. A spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, One end of the water and air passages is sealed to the water pump interface channel and air source interface channel inside the dual-channel rotary joint, and the other end is sealed to the water and air extension pipes inside the chuck. A first O-ring is provided at the solid tie rod and the first connecting plate, and a second O-ring is provided at the groove of the solid tie rod and the hollow tie rod.

8. A spindle integrating central water outlet and airtightness detection functions as described in claim 1, characterized in that, One end of the dual-channel rotary joint is fixedly connected to the first connecting plate, and the dual-channel rotary joint is provided with an air source interface and a water pump interface.

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