Hollow cooling screw joint

Abstract

This utility model discloses a hollow cooling screw connector, including a front connector, a rear connector, an adapter shaft, a fixed bushing, and a sealing assembly. The front connector and the rear connector are fixedly connected, the adapter shaft is rotatably connected to the front connector, and the fixed bushing is rotatably connected to the rear connector. The fixed bushing is threadedly connected to the end of the adapter shaft. The adapter shaft has an oil return chamber with an oil outlet hole. The front end of the hollow tube passes through the oil return chamber and the screw, and the rear end of the hollow tube is fixed in the fixed bushing. The rear connector has an oil inlet groove and an oil return groove inside. The oil inlet groove communicates with the inside of the hollow tube and has an oil inlet hole on its side wall. The oil return groove communicates with the oil return chamber and has an oil return hole on its side wall. The sealing assembly is installed in the oil return groove and seals it. Compared with the prior art, this utility model makes the end connection of the hollow tube more secure and improves its service life. In addition, it can further improve the sealing performance of the connector.

Description

Technical Field

[0001] This utility model relates to the field of lead screw transmission technology, specifically to a hollow cooling lead screw joint. Background Technology

[0002] Lead screw drives offer advantages such as high transmission efficiency, high precision, and low noise, making them widely used in machine tools. To rotatably mount the lead screw on the machine tool, its two ends are typically rotatably mounted via bearings. The lead screw nut is connected to the lead screw. During operation, a motor drives the lead screw to rotate at high speed, thereby moving the lead screw nut. However, during high-speed rotation, friction between the lead screw and nut, as well as between the lead screw and bearings, generates heat, causing the lead screw temperature to rise. This heating leads to decreased stability, compromising the lead screw's operational accuracy and consequently affecting the machining accuracy of the workpiece.

[0003] Chinese utility model patent CN219504300U discloses a lead screw cooling structure. By forming a cooling structure inside the lead screw, when cooling is needed, a cooling medium is introduced into a cooling inlet pipe. The cooling medium flows through the cooling inlet pipe to the depth of the lead screw, and then flows outward from the inside of the hollow pipe, carrying away the heat of the lead screw and thus achieving a cooling effect. However, in the above structure, sealing is only achieved through two oil seals at the upper end of the spacer ring, resulting in poor sealing performance and a tendency for cooling medium leakage.

[0004] Chinese utility model patent CN113814792A discloses a return-type cooling system for a hollow lead screw. This system forms a return-type cooling oil circuit structure inside the hollow lead screw. During operation, the cooling oil carries the heat from inside the hollow lead screw to the outside, achieving a cooling effect and ensuring the driving accuracy of the hollow lead screw. It also improves the service life of the hollow lead screw structure. However, the connection structure between the cooling oil pipe and the connector in this solution is too simple, making the cooling oil pipe prone to displacement. Furthermore, the solution lacks a sealing element, resulting in insufficient sealing performance.

[0005] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to this case. Summary of the Invention

[0006] The main objective of this invention is to provide a hollow cooling screw connector that can effectively solve the aforementioned technical problems.

[0007] To achieve the above objectives, the solution of this utility model is:

[0008] A hollow cooling screw connector includes a front connector, a rear connector, an adapter shaft, a fixed bushing, and a sealing assembly. The front connector and the rear connector are fixedly connected, the adapter shaft is rotatably connected to the front connector, and the fixed bushing is rotatably connected to the rear connector. The fixed bushing is threaded to the end of the adapter shaft. The adapter shaft has an oil return chamber with an oil outlet hole. The front end of the hollow tube passes through the oil return chamber and the screw, and the rear end of the hollow tube is fixed in the fixed bushing. The rear connector has an oil inlet groove and an oil return groove inside. The oil inlet groove communicates with the inside of the hollow tube and has an oil inlet hole on its side wall. The oil return groove communicates with the oil return chamber and has an oil return hole on its side wall. The sealing assembly is installed in the oil return groove and seals the oil return groove.

[0009] Furthermore, the fixed bushing has a first groove inside, and a copper sleeve is embedded in the first groove. The copper sleeve is fitted onto the hollow tube. The end of the adapter shaft has a threaded section that extends into the fixed bushing. The inner sidewall of the threaded section has an inclined abutment groove that abuts against the front end of the copper sleeve.

[0010] Furthermore, the sealing assembly includes a top plate, a spring, a first sealing ring, and a second sealing ring. The top plate has an outwardly protruding embedded portion that passes through the oil return groove. The rear connector has a mounting hole, and the spring is located in the mounting hole. The front end of the spring abuts against the rear side of the top plate. The front side of the top plate has a second groove, and the first sealing ring is embedded in the second groove. The adapter shaft has a third groove, and the second sealing ring is embedded in the third groove. The first sealing ring and the second sealing ring abut against each other.

[0011] Furthermore, the first sealing ring is made of silicon carbide material, and the second sealing ring is made of alumina ceramic material.

[0012] Furthermore, a first sealing ring is embedded in the side wall of the oil return groove.

[0013] Furthermore, the front connector has an internal mounting cavity, a first bearing is provided inside the mounting cavity, a first retaining ring is provided at the front end of the mounting cavity, and a fourth groove is provided on the adapter shaft, in which a second retaining ring is embedded.

[0014] Furthermore, an oil drain hole is provided on the side wall of the mounting cavity.

[0015] Furthermore, a second sealing ring is provided on the side wall of the mounting cavity.

[0016] Furthermore, a third sealing ring is provided on the side wall of the oil inlet groove.

[0017] Compared with existing technologies, the advantages of this new invention lie in its connection with a hollow tube, which provides circulating cooling oil to the inside of the lead screw, thereby cooling and dissipating heat. This invention also ensures a more secure connection at the end of the hollow tube, preventing separation and displacement between the hollow tube and the connector, effectively extending its service life. Furthermore, the sealing assembly reduces cooling oil leakage during operation, further improving the sealing performance of the connector. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure when the present invention is in operation.

[0019] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0020] Figure 3 for Figure 1 A magnified view of a portion of region B in the middle.

[0021] Figure 4 This is a top view of the cross-sectional structure of this utility model.

[0022] Figure 5 This is another cross-sectional structural diagram of the present invention.

[0023] In the diagram: Front connector 1, mounting cavity 11, oil drain hole 111, first bearing 12, first retaining ring 13, second retaining ring 14, rear connector 2, oil inlet groove 21, oil inlet hole 211, oil return groove 22, oil return hole 221, mounting hole 23, adapter shaft 3, oil return cavity 31, oil outlet hole 32, threaded section 33, inclined abutment groove 331, fixed bushing 4, copper sleeve 41, hollow tube 5, lead screw 6, abutment plate 71, embedded part 711, spring 72, first sealing ring 73, second sealing ring 74, first sealing ring 81, second sealing ring 82, third sealing ring 83. Detailed Implementation

[0024] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0025] like Figure 1-5As shown, a hollow cooling screw connector includes a front connector 1, a rear connector 2, an adapter shaft 3, a fixed bushing 4, and a sealing assembly. The front connector 1 and the rear connector 2 are fastened together by screws. The adapter shaft 3 is rotatably connected to the front connector 1. The fixed bushing 4 is rotatably connected to the rear connector 2. The fixed bushing 4 is threaded to the end of the adapter shaft 3. The adapter shaft 3 has an oil return chamber 31 with an oil outlet hole 32. The front end of the hollow tube 5 passes through the oil return chamber 31 and the screw 6, and the rear end of the hollow tube 5 is fixed in the fixed bushing 4. The rear connector 2 has an oil inlet groove 21 and an oil return groove 22 inside. The oil inlet groove 21 communicates with the interior of the hollow tube 5. The side wall of the oil inlet groove 21 has an oil inlet hole 211. The oil return groove 22 communicates with the oil return chamber 31 and has an oil return hole 221 on its side wall. The sealing assembly is installed in the oil return groove 22 and seals the oil return groove 22. With the above structure, the front end of the adapter shaft 3 is fixedly connected to the lead screw 6 by a thread. When the lead screw 6 rotates, it can drive the adapter shaft 3 and the fixed bushing 4 to rotate together. The cooling oil enters the oil inlet groove 21 through the oil inlet hole 211, and then is transported to the inside of the lead screw 6 through the hollow tube 5. After that, it flows back to the oil return chamber 31 with the lead screw 6, and then flows back to the oil return chamber 31 through the oil outlet hole 32. Finally, it flows out of the rear connector 2 through the oil return hole 221, thereby realizing the circulation of cooling oil inside the lead screw 6 to dissipate heat and cool the lead screw 6.

[0026] In this embodiment, the fixed bushing 4 has a first groove inside, and a copper sleeve 41 is embedded in the first groove. The copper sleeve 41 is fitted onto the hollow tube 5. The end of the adapter shaft 3 has a threaded section 33 that extends into the fixed bushing 4. The outer wall of the threaded section 33 is locked to the inside of the fixed bushing 4 by threads. The inner wall of the threaded section 33 has an inclined abutting groove 331 that abuts against the front end of the copper sleeve 41. With the above structure, by rotating the adapter shaft 3, the threaded section 33 gradually moves into the fixed bushing 4. During the movement, the inclined abutting groove 331 can abut against the copper sleeve 41 and lock the hollow tube 5 inward, thereby firmly connecting the hollow tube 5 to the inside of the rear connector 2.

[0027] In this embodiment, to improve the sealing performance of the oil return groove 22, the sealing assembly includes a top plate 71, a spring 72, a first sealing ring 73, and a second sealing ring 74. The top plate 71 has an outwardly protruding embedding portion 711, which slides within the oil return groove 22, providing a sliding guide for the top plate 71. The front end face of the rear connector 2 has a mounting hole 23, and the spring 72 is located within the mounting hole 23. The front end of the spring 72 abuts against the rear side of the top plate 71. The front side of the top plate 71 has a second groove, and the first sealing ring 73 is embedded in the second groove. The adapter shaft 3 has a third groove, and the second sealing ring 74 is embedded in the third groove. The first sealing ring 73 and the second sealing ring 74 abut against each other. Specifically, a first sealing ring 81 is provided on the side wall of the oil return groove 22. The first sealing ring 73 is made of silicon carbide material, and the second sealing ring 74 is made of alumina ceramic material. With the above structure, during the rotation of the lead screw 6 and the adapter shaft 3, the first sealing ring 73 and the second sealing ring 74 can seal the oil return groove 22. Under the elastic force of the spring 72, the top plate 71 is pushed forward, so that the first sealing ring 73 and the second sealing ring 74 can fit tightly together, further improving the sealing performance of the sealing assembly.

[0028] In this embodiment, the front connector 1 has a mounting cavity 11 inside, and a first bearing 12 is installed inside the mounting cavity 11. A first retaining ring 13 is provided at the front end of the mounting cavity 11. The first retaining ring 13 can prevent the first bearing 12 from falling out of the mounting cavity 11. The adapter shaft 3 has a fourth groove, and a second retaining ring 14 is embedded in the fourth groove. The second retaining ring 14 can fix the bearing on the adapter shaft 3. Furthermore, a second sealing ring 82 is provided on the side wall of the mounting cavity 11, which can seal the mounting groove. In addition, an oil drain hole 111 is provided on the side wall of the mounting cavity 11, which can drain the leaked small amount of cooling oil from the mounting cavity 11.

[0029] More preferably, a third sealing ring 83 is provided on the side wall of the oil inlet groove 21, which can improve the sealing performance of the oil inlet groove 21.

[0030] Compared with existing technologies, the advantages of this new invention are that it connects to the hollow tube 5, providing circulating cooling oil to the inside of the lead screw 6 through the hollow tube 5, thereby cooling and dissipating heat from the lead screw 6. This invention also makes the end connection of the hollow tube 5 more secure, preventing separation and displacement between the hollow tube 5 and the joint, effectively improving its service life. Furthermore, the sealing assembly reduces cooling oil leakage from the lead screw 6 during operation, further improving the sealing performance of the joint.

[0031] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A hollow cooling screw rod joint, characterized by, It includes a front connector, a rear connector, an adapter shaft, a fixed bushing, and a sealing assembly. The front connector and the rear connector are fixedly connected, the adapter shaft is rotatably connected to the front connector, and the fixed bushing is rotatably connected to the rear connector. The fixed bushing is threaded to the end of the adapter shaft. The adapter shaft has an oil return chamber with an oil outlet hole. The front end of the hollow tube passes through the oil return chamber and the lead screw, and the rear end of the hollow tube is fixed in the fixed bushing. The rear connector has an oil inlet groove and an oil return groove inside. The oil inlet groove communicates with the inside of the hollow tube and has an oil inlet hole on its side wall. The oil return groove communicates with the oil return chamber and has an oil return hole on its side wall. The sealing assembly is installed in the oil return groove and seals the oil return groove.

2. A hollow cooling screw rod joint as claimed in claim 1, characterized in that The fixed bushing has a first groove inside, and a copper sleeve is embedded in the first groove. The copper sleeve is fitted onto the hollow tube. The end of the adapter shaft has a threaded section that extends into the fixed bushing. The inner side wall of the threaded section has an inclined abutment groove that abuts against the front end of the copper sleeve.

3. A hollow cooling screw rod joint as claimed in claim 2, characterized in that The sealing assembly includes a top plate, a spring, a first sealing ring, and a second sealing ring. The top plate has an outwardly protruding embedded part that passes through the oil return groove. The rear connector has a mounting hole, and the spring is located in the mounting hole. The front end of the spring abuts against the rear side of the top plate. The front side of the top plate has a second groove, and the first sealing ring is embedded in the second groove. The adapter shaft has a third groove, and the second sealing ring is embedded in the third groove. The first sealing ring and the second sealing ring abut against each other.

4. A hollow cooling screw rod joint as defined in claim 3, characterized in that The first sealing ring is made of silicon carbide, and the second sealing ring is made of alumina ceramic.

5. A hollow cooling screw rod joint as defined in claim 1, characterized in that The side wall of the oil return groove is fitted with a first sealing ring.

6. A hollow cooling screw rod joint as defined in claim 1, characterized in that The front connector has an internal mounting cavity, a first bearing is located inside the mounting cavity, a first retaining ring is located at the front end of the mounting cavity, and a fourth groove is located on the adapter shaft, in which a second retaining ring is embedded.

7. A hollow cooling screw rod joint as defined in claim 6, characterized in that The side wall of the mounting cavity is provided with an oil drain hole.

8. A hollow cooling screw rod joint as defined in claim 6, characterized in that A second sealing ring is provided on the side wall of the mounting cavity.

9. A hollow cooling screw rod joint as defined in claim 1, characterized in that A third sealing ring is provided on the side wall of the oil inlet groove.

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