Internal water jet swivel center

Abstract

The utility model relates to the field of part quenching technology discloses an inner water spraying rotary centre, including upper centre positioning plate and positioning plate cover, the outer wall fixed mounting of upper centre positioning plate has the outer tube, the outer wall fixed mounting of outer tube has the pneumatic cylinder, the movable end fixed mounting of pneumatic cylinder has the connecting plate, the one end fixed mounting of connecting plate away from pneumatic cylinder has the sliding sleeve top cover, the lower end fixed mounting of sliding sleeve top cover has the sliding sleeve body, the inside of outer tube is provided with centre shaft. The inner water spraying rotary centre, through the design of spring, when the upper centre body is contacted with work piece, spring can absorb instantaneous impact force through compression, avoids the upper centre body collapse or work piece center hole damage caused by work piece clamping deviation or main shaft start -stop impact, simultaneously, when work piece is heated and elongated, through the upper centre body, centre shaft lifts sliding sleeve top cover, and the length of compression spring is compressed to absorb the length change of work piece, further improves the stability when using.

Description

Technical Field

[0001] This utility model relates to the field of parts quenching technology, specifically to an internal water-spraying rotating tip. Background Technology

[0002] Internal water-jet rotary centers are core components in machine tool processing, used for workpiece positioning and auxiliary support. They combine clamping, transmission, and cooling functions. Their key advantage lies in the integrated internal water-jet channel, allowing high-pressure coolant to directly reach the contact area between the workpiece and the center. This design precisely addresses two major pain points in high-speed rotary machining: firstly, it quickly removes heat generated by friction, preventing workpiece thermal deformation; secondly, it promptly flushes away cutting debris, preventing scratches on the workpiece surface or affecting machining accuracy. Structurally, it typically employs high-precision bearing assemblies to ensure stability during high-speed rotation. Combined with the pointed tip or special clamping structure of the center head, it provides reliable support for the workpiece and rotates synchronously with the spindle, transmitting torque. This component is widely used in lathes, grinding machines, and other equipment, and is particularly suitable for the precision machining of long shafts, slender parts, and other workpieces prone to vibration and heat generation.

[0003] Chinese Utility Model Patent Publication No. CN202786348U discloses a rotating device for spraying water inside a rotating shaft. The specification of this rotating device states that by setting up multiple layers of sealing protection devices inside the rotating device, quenching liquid cannot enter the bearings and motor, overcoming the shortcomings of traditional technologies, improving the service life of the entire device, and reducing maintenance costs, thus achieving the purpose of this utility model. However, this rotating device for spraying water inside a rotating shaft lacks elastic extension function. When the workpiece is heated and its length elongates, it is prone to causing the upper center body to crack or the center hole of the workpiece to be damaged, resulting in poor practicality and making it inconvenient for widespread use. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an internal water-spraying rotating tip, which can effectively solve the problem that the existing technology does not have elastic extension function, and when the workpiece is heated and its length is extended, it is easy to cause the upper tip body to break or the center hole of the workpiece to be damaged, which is not practical and not convenient for widespread use.

[0005] The technical solution adopted by this utility model is: an internal water-spraying rotating tip, including an upper tip positioning plate and a positioning plate cover plate. An outer cylinder is fixedly installed on the outer wall of the upper tip positioning plate, and a cylinder is fixedly installed on the outer wall of the outer cylinder. A connecting plate is fixedly installed on the movable end of the cylinder, and a sliding sleeve top cover is fixedly installed on the end of the connecting plate away from the cylinder. A sliding sleeve body is fixedly installed on the lower end of the sliding sleeve top cover. A tip shaft is provided inside the outer cylinder, and a ceramic deep groove ball bearing is provided on the outer wall of the sliding sleeve body. An upper tip is provided on the end of the tip shaft away from the outer cylinder. The upper cylinder has a pointed body, a rotation detection component on the outer wall of the pointed shaft, an inner water pipe on the outer wall of the sliding sleeve top cover, a spring between the connecting plate and the sliding sleeve top cover, a limit cap on the top of the outer cylinder, a guide key fixedly installed on the inner wall of the outer cylinder, a first spacer, a lower sliding sleeve cover, and a second spacer on the inner wall of the outer cylinder, a water spray pipe on the end of the limit cap away from the outer cylinder, an upper switch bracket and a lower switch bracket fixedly installed on the outer wall of the outer cylinder, a pressure-fit oil cup on the outer wall of the outer cylinder, and a slender tube inside the upper pointed body.

[0006] Preferably, one end of the spring is connected to the connecting plate, and the other end of the spring is connected to the top cover of the sliding sleeve. The top cover of the sliding sleeve has a cross-section with a "⊥" shape, and the spring is located on the outer wall of the top cover of the sliding sleeve.

[0007] Through the above technical solution and the design of the spring, when the upper center body contacts the workpiece, the spring can absorb the instantaneous impact force through compression, avoiding the breakage of the upper center body or the damage to the center hole of the workpiece caused by workpiece clamping deviation or spindle start-stop impact. At the same time, when the workpiece is heated and elongated, the upper center body and the center shaft will lift the top cover of the sliding sleeve, compress the length of the spring, and thus absorb the change in the length of the workpiece, further improving the stability during use.

[0008] Preferably, the sliding sleeve body and the outer cylinder are slidably connected, and the end of the center shaft away from the upper center body is fixedly installed with the ceramic deep groove ball bearing.

[0009] Through the above technical solution, the ceramic deep groove ball bearing is designed to be highly corrosion resistant, resist long-term erosion by coolant, avoid rotational jamming caused by rust in metal bearings, and extend the maintenance cycle of the center shaft.

[0010] Preferably, the water spray pipe is connected to an external water pipe, and the water spray pipe and the internal water pipe are connected to a slender pipe.

[0011] Through the above technical solution, the coolant is directly delivered to the core area where the cutting edge contacts the workpiece through the slender tube inside the upper center body via the combination of the water spray pipe, the internal water pipe and the slender tube. Compared with external spraying, the cooling efficiency is significantly improved, which can quickly remove the local high temperature generated during processing and effectively control the dimensional deviation and shape error of the workpiece caused by thermal expansion and contraction.

[0012] Preferably, the lower end of the upper tip is designed in a "conical" shape, and the center line of the upper tip and the tip axis are located on the same vertical line.

[0013] The above technical solution, which adopts a "conical" design for the upper center, enables precise positioning of the upper center, facilitating its rapid contact with the inner hole of the workpiece, and thus has high practicality.

[0014] Preferably, an O-ring is provided between the center shaft and the upper center body, and a retaining ring is provided between the ceramic deep groove ball bearing and the center shaft.

[0015] The above technical solutions, through the design of O-rings, can effectively prevent coolant from seeping into the bearing cavity, avoiding bearing failure caused by the dilution of grease. Through the design of retaining rings, the radial runout of the center shaft during rotation can be controlled at the micron level, providing a stable support reference for the workpiece and ensuring the needs of high-precision turning and grinding.

[0016] Compared with the prior art, the present invention provides an internal water-spraying rotating tip, which has the following beneficial effects: 1. This internal water-spraying rotating center, with its ceramic deep groove ball bearing design, has strong corrosion resistance and can resist long-term erosion by coolant, avoiding rotational jamming caused by rust on the metal bearing. This extends the maintenance cycle of the center shaft, meets practical usage requirements, and effectively controls the quenching quality of the product. The design of the spring, sliding sleeve top cover, and connecting plate prevents the upper center body from cracking or the workpiece center hole from being damaged due to workpiece clamping deviation or spindle start-stop impact. The "conical" design of the upper center body enables precise positioning of the upper center body, facilitating the upper center body to quickly press against the inner hole of the workpiece, making it highly practical. 2. This internal water-spraying rotating center, through the cooperation of the water spray pipe, internal water pipe, and slender tube, delivers coolant directly to the core area where the cutting edge contacts the workpiece via the slender tube inside the upper center body. Compared to external spraying, the cooling efficiency is significantly improved, quickly removing localized high temperatures generated during machining and effectively controlling dimensional deviations and form and position errors of the workpiece caused by thermal expansion and contraction. The O-ring design effectively prevents coolant from seeping into the bearing cavity, avoiding bearing failure caused by grease dilution. The through-shaft retaining ring design controls the radial runout of the center shaft to the micron level during rotation, providing a stable support reference for the workpiece and ensuring the requirements of high-precision turning and grinding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ; Figure 4 This is a front view structural diagram of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention.

[0018] The components include: 1. Upper center positioning plate; 2. Positioning plate cover; 3. Rotation detection component; 4. Limit cap; 5. Sliding sleeve top cover; 6. Outer cylinder; 7. Sliding sleeve body; 8. Spacer one; 9. Sliding sleeve lower cover; 10. Center shaft; 11. Guide key; 12. Upper center body; 13. Water spray pipe; 14. Upper switch bracket; 15. Connecting plate; 16. Lower switch bracket; 17. Spring; 18. Spacer two; 19. Inner water pipe; 20. Ceramic deep groove ball bearing; 21. Shaft retaining ring; 22. O-ring; 23. Cylinder; 24. Press-fit oil cup; 25. Slender tube. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: like Figure 1-5 As shown, the present invention provides an internal water-spraying rotating tip, comprising an upper tip positioning plate 1 and a positioning plate cover plate 2. An outer cylinder 6 is fixedly installed on the outer wall of the upper tip positioning plate 1. A cylinder 23 is fixedly installed on the outer wall of the outer cylinder 6. A connecting plate 15 is fixedly installed on the movable end of the cylinder 23. A sliding sleeve top cover 5 is fixedly installed on the end of the connecting plate 15 away from the cylinder 23. A sliding sleeve body 7 is fixedly installed on the lower end of the sliding sleeve top cover 5. A tip shaft 10 is provided inside the outer cylinder 6. A ceramic deep groove ball bearing 20 is provided on the outer wall of the sliding sleeve body 7. An upper tip body 12 is provided on the end of the tip shaft 10 away from the outer cylinder 6. The outer wall of the pointed shaft 10 is provided with a rotation detection component 3, the outer wall of the sliding sleeve top cover 5 is provided with an inner water pipe 19, a spring 17 is provided between the connecting plate 15 and the sliding sleeve top cover 5, a limit cap 4 is provided at the top of the outer cylinder 6, a guide key 11 is fixedly installed on the inner wall of the outer cylinder 6, a first spacer 8, a lower sliding sleeve cover 9 and a second spacer 18 are provided on the inner wall of the outer cylinder 6, a water spray pipe 13 is provided at the end of the limit cap 4 away from the outer cylinder 6, an upper switch bracket 14 and a lower switch bracket 16 are fixedly installed on the outer wall of the outer cylinder 6, a pressure-fit oil cup 24 is provided on the outer wall of the outer cylinder 6, and a slender tube 25 is provided inside the upper pointed body 12.

[0021] Specifically, one end of the spring 17 is connected to the connecting plate 15, and the other end of the spring 17 is connected to the sliding sleeve top cover 5. The cross-section of the sliding sleeve top cover 5 is a "⊥" shaped structure, and the spring 17 is located on the outer wall of the sliding sleeve top cover 5. The advantage is that, through the design of the spring 17, when the upper center body 12 contacts the workpiece, the spring 17 can absorb the instantaneous impact force through compression, avoiding the breakage of the upper center body 12 or the damage to the workpiece center hole caused by workpiece clamping deviation or spindle start-stop impact. At the same time, when the workpiece is heated and elongated, the upper center body 12 and the center shaft 10 lift the sliding sleeve top cover 5, compressing the length of the spring 17 to absorb the change in the length of the workpiece, further improving the stability during use.

[0022] Specifically, the sliding sleeve body 7 and the outer cylinder 6 are slidably connected, and the end of the center shaft 10 away from the upper center body 12 is fixedly installed with the ceramic deep groove ball bearing 20. The advantage is that, through the design of the ceramic deep groove ball bearing 20, it has strong corrosion resistance, can resist long-term erosion by coolant, avoids rotational jamming caused by rust in the metal bearing, and can extend the maintenance cycle of the center shaft 10.

[0023] Example 2: like Figure 2-5 As shown, as an improvement on the previous embodiment, to further facilitate workpiece cooling, specifically, the water spray pipe 13 is connected to an external water pipe, and the water spray pipe 13, the internal water pipe 19, and the slender pipe 25 are connected. The advantage is that, through the cooperation of the water spray pipe 13, the internal water pipe 19, and the slender pipe 25, the coolant is directly delivered through the slender pipe 25 inside the upper center body 12 to the core area where the cutting edge contacts the workpiece. Compared to external spraying, the cooling efficiency is significantly improved, quickly removing the localized high temperatures generated during processing and effectively controlling dimensional deviations and positional errors in the workpiece caused by thermal expansion and contraction.

[0024] Specifically, the lower end of the upper center 12 adopts a "conical" design, and the center line of the upper center 12 and the center shaft 10 are located on the same vertical line. The advantage is that the "conical" design of the upper center 12 can achieve precise positioning of the upper center 12, making it easy for the upper center 12 to quickly press against the inner hole of the workpiece, thus having high practicality.

[0025] Specifically, an O-ring 22 is provided between the center shaft 10 and the upper center body 12, and a retaining ring 21 is provided between the ceramic deep groove ball bearing 20 and the center shaft 10. The advantages are that the O-ring 22 effectively prevents coolant from seeping into the bearing cavity, avoiding bearing failure caused by grease dilution. The retaining ring 21 controls the radial runout of the center shaft 10 during rotation to the micrometer level, providing a stable support reference for the workpiece and ensuring the requirements of high-precision turning and grinding.

[0026] Working Principle: During use, the spring 17, through its design, absorbs the instantaneous impact force when the upper center body 12 contacts the workpiece, preventing the upper center body 12 from cracking or the workpiece's center hole from being damaged due to workpiece clamping deviation or spindle start-stop impact. Simultaneously, when the workpiece is heated and elongated, the upper center body 12 and center shaft 10 lift the sliding sleeve cover 5, compressing the spring 17 to absorb changes in workpiece length, further improving stability during use. The ceramic deep groove ball bearing 20 is highly corrosion-resistant, resisting long-term coolant erosion and preventing rotational jamming caused by rust in metal bearings, thus extending the maintenance cycle of the center shaft 10. The water spray pipe 13, internal water pipe 19, and slender pipe 25 work together to achieve optimal performance. The coolant is directly delivered to the core area where the cutting edge contacts the workpiece through the slender tube 25 inside the upper center body 12. Compared with external spraying, the cooling efficiency is significantly improved, which can quickly remove the local high temperature generated during processing and effectively control the dimensional deviation and form and position error of the workpiece caused by thermal expansion and contraction. The upper center body 12 with a "conical" design can achieve precise positioning of the upper center body 12, which makes it easy for the upper center body 12 to quickly press against the inner hole of the workpiece, which is highly practical. The design of the O-ring 22 can effectively prevent the coolant from seeping into the bearing cavity and avoid bearing failure caused by the dilution of grease. The design of the through-shaft retaining ring 21 can control the radial runout of the center shaft 10 during rotation to the micron level, providing a stable support reference for the workpiece and ensuring the high-precision turning and grinding requirements.

[0027] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal water-spraying rotating tip, comprising an upper tip positioning plate (1) and a positioning plate cover plate (2), characterized in that: An outer cylinder (6) is fixedly installed on the outer wall of the upper center positioning plate (1). A cylinder (23) is fixedly installed on the outer wall of the outer cylinder (6). A connecting plate (15) is fixedly installed on the movable end of the cylinder (23). A sliding sleeve top cover (5) is fixedly installed on the end of the connecting plate (15) away from the cylinder (23). A sliding sleeve body (7) is fixedly installed on the lower end of the sliding sleeve top cover (5). A center shaft (10) is provided inside the outer cylinder (6). A ceramic deep groove ball bearing (20) is provided on the outer wall of the sliding sleeve body (7). An upper center body (12) is provided on the end of the center shaft (10) away from the outer cylinder (6). A rotation detection component (3) is provided on the outer wall of the center shaft (10). The sliding sleeve... The outer wall of the top cover (5) is provided with an inner water pipe (19), and a spring (17) is provided between the connecting plate (15) and the sliding top cover (5). The top of the outer cylinder (6) is provided with a limit cap (4). The inner wall of the outer cylinder (6) is fixedly installed with a guide key (11). The inner wall of the outer cylinder (6) is provided with a first partition (8), a lower sliding cover (9) and a second partition (18). The end of the limit cap (4) away from the outer cylinder (6) is provided with a water spray pipe (13). The outer wall of the outer cylinder (6) is fixedly installed with an upper switch bracket (14) and a lower switch bracket (16). The outer wall of the outer cylinder (6) is provided with a pressure-fit oil cup (24). The inside of the upper center body (12) is provided with a slender tube (25).

2. The internal water-jet rotating tip according to claim 1, characterized in that: One end of the spring (17) is connected to the connecting plate (15), and the other end of the spring (17) is connected to the top cover of the sliding sleeve (5). The cross-section of the top cover of the sliding sleeve (5) is in the shape of a "⊥" and the spring (17) is located on the outer wall of the top cover of the sliding sleeve (5).

3. The internal water jet rotating tip according to claim 1, characterized in that: The sliding sleeve body (7) and the outer cylinder (6) are slidably connected, and the end of the center shaft (10) away from the upper center body (12) is fixedly installed with the ceramic deep groove ball bearing (20).

4. The internal water jet rotating tip according to claim 1, characterized in that: The water spray pipe (13) is connected to the external water pipe, and the water spray pipe (13) and the internal water pipe (19) are connected to the slender pipe (25).

5. The internal water-jet rotating tip according to claim 1, characterized in that: The lower end of the upper tip (12) adopts a "conical" design, and the center line of the upper tip (12) and the tip shaft (10) are located on the same vertical line.

6. The internal water jet rotating tip according to claim 1, characterized in that: An O-ring (22) is provided between the center shaft (10) and the upper center body (12), and a shaft retaining ring (21) is provided between the ceramic deep groove ball bearing (20) and the center shaft (10).

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