Ball screw with lubricating function and lubricating method thereof

Abstract

The invention discloses a ball screw with a lubricating function and a lubricating method thereof, and relates to the technical field of ball screws, the ball screw comprises a lead screw shaft and a nut, the nut is installed outside the lead screw shaft, an external thread groove is formed in the outer side surface of the lead screw shaft, an internal thread groove is formed in the internal surface of the nut, and the external thread groove is communicated with the internal thread groove. A ball body is arranged in the internal thread groove; the first mounting plate is arranged at one end of the lead screw shaft, a second mounting plate is arranged at the other end of the lead screw shaft, a protruding block is integrally formed at one end of the nut, and when the nut makes contact with the first mounting plate, the telescopic pipe connects a pipeline between the nut and the first mounting plate; lubricating liquid is conveyed into the first mounting plate through the connecting pipe under the action of air pressure, then conveyed into the nut through the telescopic pipe and finally conveyed into the internal thread groove, the surface of the internal thread groove and the balls are lubricated, and the surfaces of the balls are wrapped with the lubricating liquid.

Description

Technical Field

[0001] The invention relates to the technical field of ball screws, in particular to a ball screw with a lubrication function and a lubrication method thereof. Background Art

[0002] Ball screw, also known as ball screw, is an ideal product for converting rotary motion into linear motion, or converting linear motion into rotary motion. Ball screw is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque into axial repetitive force, while having the characteristics of high precision, reversibility and high efficiency.

[0003] At present, ball screws are in use on the market. Since the ball screws themselves do not have lubrication function, they can only be lubricated by artificial addition. During the long-term rolling operation of the screw and the ball, the long-term friction of the contact surface may cause surface wear, which will affect the smoothness of the screw in use, and may even cause jamming, which will greatly affect the use of the installed equipment. For this reason, we provide a ball screw with lubrication function and a lubrication method thereof. Summary of the invention

[0004] The object of the present invention is to provide a ball screw with lubrication function and a lubrication method thereof, so as to solve the problem raised in the above background technology that during the long-term rolling operation of the screw and the ball, the long-term friction of the contact surface may cause surface wear, which will affect the smoothness of the screw in use, and may seriously cause jamming, which will greatly affect the use of the installed equipment.

[0005] To achieve the above object, the present invention provides the following technical solution: a ball screw with lubrication function, comprising a screw shaft and a nut, wherein the nut is installed outside the screw shaft, the outer surface of the screw shaft is provided with an external thread groove, the inner surface of the nut is provided with an internal thread groove, and a ball body is provided in the internal thread groove;

[0006] Also includes:

[0007] A first mounting plate is arranged at one end of the screw shaft, and a second mounting plate is arranged at the other end of the screw shaft. A protrusion block is integrally formed at one end of the nut, and a first movable groove is arranged on an inner side of the protrusion block. A connecting path is arranged on an inner side of the nut, and the connecting path is connected with the first movable groove. A through groove is formed at a contact point between the connecting path and the internal thread groove. A second movable groove is arranged on a surface side of the first mounting plate, and the first movable groove is aligned with the second movable groove. A connecting groove is arranged on an outer side of the first mounting plate, and the connecting groove is connected with the second movable groove. A connecting pipe is arranged on an outer side of the first mounting plate, and the connecting pipe is connected with the connecting groove. A sealing cylinder is arranged on the other end of the connecting pipe.

[0008] Preferably, a first spring is arranged inside the first movable groove, one end of the spring is connected to a first sealing gasket, a limiting notch is integrally formed at the bottom of the first movable groove, and the first sealing gasket is movably fitted on the surface of the limiting notch.

[0009] Preferably, a telescopic tube is provided inside the second movable groove, the front end of the telescopic tube extends out of the surface of the first mounting plate, and the front end of the telescopic tube is movably engaged with the inside of the first movable groove, a through hole is provided in the middle of the inside of the telescopic tube, a water outlet is provided on the side of the surface of the telescopic tube close to the connecting channel, and the water outlet is communicated with the through hole, a water inlet is provided on the side of the surface of the telescopic tube close to the connecting groove, and the water inlet is communicated with the through hole, a second sealing gasket is fixed to the bottom of the telescopic tube, and a second spring is provided below the second sealing gasket.

[0010] Preferably, a connecting rod is provided at the bottom of the second sealing gasket, and the connecting rod extends out of the surface of the first mounting plate, and a limiting block is provided at the other end of the connecting rod, and the limiting block moves on the outer surface of the first mounting plate.

[0011] Preferably, both the front and rear ends of the nut are provided with circular rings, and the inner diameter of the circular ring is provided with a sponge ring.

[0012] Preferably, a valve is provided on one side of the surface of the connecting pipe.

[0013] Preferably, a piston disc is provided in the inner middle layer of the sealing cylinder.

[0014] Preferably, a lubrication method for a ball screw with a lubrication function comprises the following steps:

[0015] Step 1: Add lubricating liquid to the bottom layer of the sealing cylinder so that the lubricating liquid is located below the piston disc, and continuously inject gas into the upper layer of the sealing cylinder. The extrusion of the lubricating liquid and the gas keeps the piston disc in a balanced state in the middle layer of the sealing cylinder.

[0016] Step 2: The lead screw shaft is driven by the motor to rotate, so that the nut translates on the surface of the lead screw shaft. When the nut moves to one side of the first mounting plate, the protruding block contacts the front end of the telescopic tube, so that the telescopic tube extends into the first movable groove, and the telescopic tube pushes the first sealing gasket inward. At the same time, the telescopic tube is also pushed backward under the action of external force, so that the second sealing gasket is pushed backward;

[0017] Step 3: After the telescopic tube is pushed into the first movable groove, one end of the connecting channel is connected to the water outlet on one side of the telescopic tube, and at the same time, the second sealing gasket is pushed backward to make one end of the connecting groove connect to the water inlet outside the telescopic tube;

[0018] Step 4: Since the connecting groove is connected to the connecting pipe, and the other end of the connecting pipe is connected to the inside of the sealing cylinder, the lubricating liquid is transported to the inside of the connecting groove through the connecting pipe under the action of air pressure, enters the through hole through the water inlet, enters the connecting channel through the water outlet, and enters the internal thread groove through the through groove, so that the lubricating liquid enters the internal thread groove to lubricate the ball and the thread groove;

[0019] Step 5: Then the screw shaft rotates to remove the nut, and the front end of the telescopic tube is separated from the first movable groove. Under the action of the first spring, the first sealing gasket seals the entrance of the first movable groove, and the telescopic tube is pushed up by the second spring, so that the second sealing gasket seals the connecting groove, thereby blocking the lubricating fluid. If lubrication is not performed for a long time, the valve can be closed and the gas injection into the sealing cylinder can be stopped;

[0020] Step 6: The nut moves back and forth on the screw shaft, and the excess lubricating liquid can be absorbed by the sponge ring and rubbed on the surface of the screw shaft during the movement, thereby lubricating the external thread groove on the surface of the screw shaft.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention arranges a sealing cylinder on one side of the first mounting plate, which is connected to the first mounting plate through a connecting pipe. A pipeline for conveying lubricating liquid is arranged inside the first mounting plate and the nut. When the nut contacts the first mounting plate, the telescopic pipe connects the pipeline between the nut and the first mounting plate. The lubricating liquid is conveyed into the first mounting plate through the connecting pipe under the action of air pressure, and then conveyed into the nut through the telescopic pipe, and finally conveyed to the internal thread groove to lubricate the surface of the internal thread groove and the ball, so that the lubricating liquid is wrapped around the surface of the ball. When the nut moves, the ball rolls in the internal thread groove, and the lubricating liquid can be brought to the place where the front end of the screw shaft is not coated, thereby achieving the function of automatically adding lubrication.

[0023] 2. By setting a first sealing gasket and a second sealing gasket and applying pressure through a spring, the sealing gasket is blocked at the inlet and outlet to achieve sealing. When the nut is attached to the first mounting plate and stays for a period of time, a pipe for communication is provided inside the telescopic tube. The telescopic tube will push out the first sealing gasket and the second sealing gasket. At this time, the pipe inside the nut is connected with the pipe inside the first mounting plate under the action of the telescopic tube, so that the lubricating fluid can smoothly pass through the pipe into the interior of the internal thread groove. When the nut leaves, the telescopic tube is disengaged from the first movable groove, and the first sealing gasket and the second sealing gasket return to their original positions under the action of the spring to seal and block the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a cross-sectional view of a nut of the present invention;

[0026] Figure 3 It is a front cross-sectional view of the nut of the present invention;

[0027] Figure 4 It is a cross-sectional view of the interior of the sealing cylinder of the present invention;

[0028] Figure 5 It is the front view of the ring of the present invention;

[0029] Figure 6 It is an enlarged view of the structure at A of the present invention;

[0030] In the figure: 1. screw shaft; 2. first mounting plate; 3. second mounting plate; 4. nut; 5. protruding block; 6. circular ring; 7. sealing cylinder; 8. connecting pipe; 9. valve; 10. external thread groove; 11. internal thread groove; 12. connecting channel; 13. through groove; 14. first movable groove; 15. connecting groove; 16. limiting notch; 17. first spring; 18. first sealing gasket; 19. telescopic tube; 20. through hole; 21. water outlet; 22. water inlet; 23. second sealing gasket; 24. second spring; 25. limiting block; 26. connecting rod; 27. second movable groove; 28. sponge ring; 29. ​​ball sphere; 30. piston disc. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-6, an embodiment of the present invention: a ball screw with a lubricating function, comprising a screw shaft 1 and a nut 4, the nut 4 is installed outside the screw shaft 1, the outer surface of the screw shaft 1 is provided with an external thread groove 10, the inner surface of the nut 4 is provided with an internal thread groove 11, and a ball body 29 is provided in the internal thread groove 11;

[0033] Also includes:

[0034] A first mounting plate 2 is provided at one end of the screw shaft 1, and a second mounting plate 3 is provided at the other end of the screw shaft 1. A protrusion block 5 is integrally formed at one end of the nut 4, and a first movable groove 14 is provided on an inner side of the protrusion block 5. A connecting channel 12 is provided on an inner side of the nut 4, and the connecting channel 12 is connected to the first movable groove 14. A through groove 13 is formed at the contact point between the connecting channel 12 and the internal thread groove 11. A second movable groove 27 is provided on one side of the surface of the first mounting plate 2, and the first movable groove 14 is aligned with the second movable groove 27. A connecting groove 15 is provided on the outer side of the first mounting plate 2, and the connecting groove 15 is connected to the second movable groove 27. A connecting pipe 8 is provided on the outer side of the first mounting plate 2, and the connecting pipe 8 is connected to the connecting groove 15. A sealing cylinder 7 is provided on the other end of the connecting pipe 8.

[0035] When the nut 4 contacts the first mounting plate 2, the telescopic tube 19 connects the pipeline between the nut 4 and the first mounting plate 2. The lubricating liquid is transported into the interior of the first mounting plate 2 through the connecting tube 8 under the action of air pressure, and then transported into the interior of the nut 4 through the telescopic tube 19, and finally transported to the internal thread groove 11, lubricating the surface of the internal thread groove 11 and the ball, so that the lubricating liquid is wrapped around the surface of the ball.

[0036] See also Figure 6 A first spring 17 is arranged inside the first movable groove 14, one end of the spring is connected to a first sealing gasket 18, a limiting notch 16 is integrally formed at the bottom of the first movable groove 14, and the first sealing gasket 18 is movably fitted on the surface of the limiting notch 16 to seal the first movable groove 14.

[0037] See also Figure 6 A telescopic tube 19 is arranged inside the second movable groove 27, and the front end of the telescopic tube 19 extends out of the surface of the first mounting plate 2, and the front end of the telescopic tube 19 is movably engaged with the inside of the first movable groove 14, and a through hole 20 is arranged in the middle of the inside of the telescopic tube 19, and a water outlet 21 is arranged on the side of the surface of the telescopic tube 19 close to the connecting channel 12, and the water outlet 21 is communicated with the through hole 20, and a water inlet 22 is arranged on the side of the surface of the telescopic tube 19 close to the connecting groove 15, and the water inlet 22 is communicated with the through hole 20, and a second sealing gasket 23 is fixed to the bottom of the telescopic tube 19, and a second spring 24 is arranged below the second sealing gasket 23 for blocking the second movable groove 27.

[0038] See also Figure 6 A connecting rod 26 is provided at the bottom of the second sealing gasket 23, and the connecting rod 26 extends out of the surface of the first mounting plate 2. A limiting block 25 is provided at the other end of the connecting rod 26, and the limiting block 25 is movable on the outer surface of the first mounting plate 2, and the movement of the telescopic tube 19 is limited by the limiting block 25.

[0039] See also Figure 5 , circular rings 6 are provided at both the front and rear ends of the nut 4, and a sponge ring 28 is provided on the inner diameter of the circular ring 6. The sponge ring 28 can absorb excess lubricating liquid and rub it on the surface of the screw shaft 1 during movement, thereby lubricating the remaining external thread grooves 10 on the surface of the screw shaft 1.

[0040] See also Figure 1 A valve 9 is provided on one side of the surface of the connecting pipe 8. When lubrication is not required, the lubricating liquid will not be transported by closing the valve 9.

[0041] See also Figure 4 A piston disc 30 is provided in the middle layer of the sealing cylinder 7, and the piston disc 30 separates the lubricating liquid and the gas.

[0042] See also Figure 1-6 , a lubrication method for a ball screw with a lubrication function, comprising the following steps:

[0043] Step 1: Add lubricating liquid to the bottom layer of the sealing cylinder 7 so that the lubricating liquid is located below the piston disc 30, and continuously inject gas into the upper layer of the sealing cylinder 7. The extrusion of the lubricating liquid and the gas keeps the piston disc 30 in a balanced state in the middle layer of the sealing cylinder 7;

[0044] Step 2: The screw shaft 1 is driven by the motor to rotate, so that the nut 4 is translated on the surface of the screw shaft 1. When the nut 4 moves to one side of the first mounting plate 2, the protruding block 5 contacts the front end of the telescopic tube 19, so that the telescopic tube 19 extends into the first movable groove 14, and the telescopic tube 19 pushes the first sealing gasket 18 inwardly. At the same time, the telescopic tube 19 is also pushed backward under the action of external force, so that the second sealing gasket 23 is pushed backward;

[0045] Step 3: After the telescopic tube 19 is pushed into the first movable groove 14, one end of the connecting channel 12 is connected to the water outlet 21 on one side of the telescopic tube 19, and at the same time, the second sealing gasket 23 is pushed backward to make one end of the connecting groove 15 connected to the water inlet 22 outside the telescopic tube 19;

[0046] Step 4: Since the connecting groove 15 is connected to the connecting pipe 8, and the other end of the connecting pipe 8 is connected to the inside of the sealing cylinder 7, the lubricating liquid is transported to the inside of the connecting groove 15 through the connecting pipe 8 under the action of air pressure, enters the through hole 20 through the water inlet 22, and then enters the connecting channel 12 through the water outlet 21, and enters the internal thread groove 11 through the through groove 13, so that the lubricating liquid enters the internal thread groove 11 to lubricate the ball and the thread groove;

[0047] Step 5: Then the screw shaft 1 rotates to remove the nut 4, and the front end of the telescopic tube 19 is separated from the first movable groove 14. Under the action of the first spring 17, the first sealing gasket 18 seals the entrance of the first movable groove 14, and the telescopic tube 19 is pushed up by the second spring 24, so that the second sealing gasket 23 seals the connecting groove 15, thereby blocking the lubricating fluid. If lubrication is not performed for a long time, the valve 9 can be closed and the gas injection into the sealing cylinder 7 can be stopped;

[0048] Step 6: The nut 4 moves back and forth on the screw shaft 1 , and the excess lubricating liquid can be absorbed by the sponge ring 28 and rubbed on the surface of the screw shaft 1 during the movement, thereby lubricating the external thread groove 10 on the surface of the screw shaft 1 .

[0049] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A ball screw with a lubricating function, comprising a screw shaft (1) and a nut (4), wherein the nut (4) is mounted on the outside of the screw shaft (1), an outer surface of the screw shaft (1) is provided with an outer thread groove (10), an inner surface of the nut (4) is provided with an inner thread groove (11), and a ball body (29) is provided in the inner thread groove (11); Features: Also includes: A first mounting plate (2) is arranged at one end of the screw shaft (1), and a second mounting plate (3) is arranged at the other end of the screw shaft (1). A protrusion block (5) is integrally formed at one end of the nut (4), and a first movable groove (14) is arranged on one side of the inner part of the protrusion block (5). A connecting channel (12) is arranged on one side of the inner part of the nut (4), and the connecting channel (12) is connected to the first movable groove (14). A through groove is formed at a contact point between the connecting channel (12) and the internal thread groove (11). (13), a second movable groove (27) is provided on one side of the surface of the first mounting plate (2), and the first movable groove (14) is aligned with the second movable groove (27), a connecting groove (15) is provided on the outer side of the first mounting plate (2), and the connecting groove (15) is connected to the second movable groove (27), a connecting pipe (8) is provided on the outer side of the first mounting plate (2), and the connecting pipe (8) is connected to the connecting groove (15), and a sealing cylinder (7) is provided at the other end of the connecting pipe (8).

2. The ball screw with lubrication function according to claim 1, characterized in that: A first spring (17) is arranged inside the first movable groove (14), one end of the spring is connected to a first sealing gasket (18), a limiting notch (16) is integrally formed at the bottom of the first movable groove (14), and the first sealing gasket (18) is movably fitted on the surface of the limiting notch (16).

3. The ball screw with lubrication function according to claim 1, characterized in that: A telescopic tube (19) is arranged inside the second movable groove (27), the front end of the telescopic tube (19) extends out of the surface of the first mounting plate (2), and the front end of the telescopic tube (19) is movably engaged with the inside of the first movable groove (14), a through hole (20) is arranged in the middle of the inside of the telescopic tube (19), a water outlet (21) is arranged on the side of the surface of the telescopic tube (19) close to the connecting channel (12), and the water outlet (21) is communicated with the through hole (20), a water inlet (22) is arranged on the side of the surface of the telescopic tube (19) close to the connecting groove (15), and the water inlet (22) is communicated with the through hole (20), a second sealing gasket (23) is fixed to the bottom of the telescopic tube (19), and a second spring (24) is arranged below the second sealing gasket (23).

4. The ball screw with lubrication function according to claim 3, characterized in that: A connecting rod (26) is arranged at the bottom of the second sealing pad (23), and the connecting rod (26) extends out of the surface of the first mounting plate (2); a limiting block (25) is arranged at the other end of the connecting rod (26), and the limiting block (25) is movable on the outer surface of the first mounting plate (2).

5. The ball screw with lubrication function according to claim 1, characterized in that: The front and rear ends of the nut (4) are both provided with circular rings (6), and the inner diameter of the circular ring (6) is provided with a sponge ring (28).

6. The ball screw with lubrication function according to claim 1, characterized in that: A valve (9) is provided on one side of the surface of the connecting pipe (8).

7. The ball screw with lubrication function according to claim 1, characterized in that: A piston disc (30) is arranged in the middle layer inside the sealing cylinder (7).

8. A lubricating method for a ball screw with a lubricating function, implemented based on the ball screw with a lubricating function according to claims 1-7, characterized in that: The following steps are involved: Step 1: Lubricating liquid is added to the bottom layer of the sealing cylinder (7) so that the lubricating liquid is located below the piston disc (30), and gas is continuously injected into the upper layer of the sealing cylinder (7). The lubricating liquid and gas are squeezed to keep the piston disc (30) in a balanced state in the middle layer of the sealing cylinder (7); Step 2: The lead screw shaft (1) is driven by a motor to rotate, so that the nut (4) moves horizontally on the surface of the lead screw shaft (1). When the nut (4) moves to one side of the first mounting plate (2), the protruding block (5) contacts the front end of the telescopic tube (19), so that the telescopic tube (19) extends into the interior of the first movable groove (14), and the telescopic tube (19) pushes the first sealing gasket (18) inwardly. At the same time, under the action of an external force, the telescopic tube (19) is also pushed backward, so that the second sealing gasket (23) is pushed backward; Step 3: After the telescopic tube (19) is pushed into the first movable groove (14), one end of the connecting channel (12) is connected to the water outlet (21) on one side of the telescopic tube (19), and at the same time, the second sealing gasket (23) is pushed backward to make one end of the connecting groove (15) connect to the water inlet (22) on the outside of the telescopic tube (19); Step 4: Since the connecting groove (15) is connected to the connecting pipe (8), and the other end of the connecting pipe (8) is connected to the inside of the sealing cylinder (7), the lubricating liquid is transported to the inside of the connecting groove (15) through the connecting pipe (8) under the action of air pressure, enters the through hole (20) through the water inlet (22), enters the connecting channel (12) through the water outlet (21), and enters the internal thread groove (11) through the through groove (13), so that the lubricating liquid enters the internal thread groove (11) to lubricate the ball bearing and the thread groove; Step 5: The screw shaft (1) is then rotated to remove the nut (4), and the front end of the telescopic tube (19) is separated from the first movable groove (14). Under the action of the first spring (17), the first sealing gasket (18) seals the entrance of the first movable groove (14), and the telescopic tube (19) is pushed upward under the action of the second spring (24), so that the second sealing gasket (23) seals the connecting groove (15), thereby blocking the lubricating fluid. If lubrication is not performed for a long time, the valve (9) can be closed and the injection of gas into the sealing cylinder (7) is stopped; Step 6: The nut (4) moves back and forth on the screw shaft (1), and the sponge ring (28) absorbs excess lubricating liquid and rubs it on the surface of the screw shaft (1) during the movement, thereby lubricating the external thread groove (10) on the surface of the screw shaft (1).

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