Hollow cooling device for feed screw

Abstract

The utility model provides a hollow cooling device for a feed screw, and belongs to the technical field of machining equipment. The problem that bearings at the two ends of an existing lead screw are poor in cooling effect is solved. The hollow cooling device for the feeding lead screw comprises a first bearing, a second bearing, a first bearing seat, a second bearing seat and the lead screw with a center hole, a first cooling groove surrounding the peripheral side of the first bearing is formed in the first bearing seat, and a liquid inlet hole and a first liquid outlet hole which are both communicated with the first cooling groove are formed in the outer surface of the first bearing seat; the first liquid outlet hole communicates with the lead screw center hole through a first external pipe, a second cooling groove surrounding the peripheral side of the second bearing is formed in the second bearing seat, and a liquid passing channel communicating with the second cooling groove and the lead screw center hole is further formed in the second bearing seat. And a second liquid outlet hole communicated with the second cooling groove is formed in the outer surface of the second bearing seat. According to the hollow cooling device for the feed screw, the cooling effect of bearings at the two ends of the screw is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of processing equipment and relates to a hollow cooling device for a feed screw. Background Art

[0002] With the huge demand for CNC machine tools in manufacturing and the rapid progress of computer technology and modern design technology, the application scope of CNC machine tools is still expanding, and it is constantly developing to meet the needs of high-precision, high-speed, and composite production and processing. High-speed machining machine tools are based on the development of modern tool materials. In order to meet the development needs of industries such as aviation, aerospace, automobiles, and molds, they are efficient and high-performance machining machine tools developed on the basis of CNC milling machines and machining centers. Therefore, its basic characteristics are not only high cutting speed (5 to 10 times the conventional cutting speed), fast feed / rapid moving speed (up to 40 to 180m / min), and large acceleration and deceleration (now mostly 1 to 2g). Since high-speed machining machine tools have many advantages, such as high production efficiency and material removal rate is 3 to 6 times that of conventional cutting machine tools, it can greatly shorten the processing time and manufacturing cycle of parts, and the cutting force is 30 to 50% less than that at conventional speeds.

[0003] However, the temperature of CNC machine tools will rise during high-speed movement, and thermal deformation will occur after the temperature rises, thereby affecting the movement accuracy of the machine tool. Specifically, the machine tool is mainly driven by the screw nut mechanism during feeding. When the screw rotates at high speed, the temperature of the screw will rise, causing the screw to thermally deform and affect the accuracy of the machine tool during high-speed movement. For example, a cooling device for a ball screw assembly disclosed in Chinese patent literature [publication number: CN1773146B] includes a ball screw shaft, a ball nut sleeved on the ball screw shaft, and a plurality of balls. The ball screw shaft is formed with a cooling fluid circulation channel with an axial end sealed in the center, and at least one cooling fluid inlet and outlet are radially arranged on both sides of the channel; the cooling device has a chamber, which is formed along the circumference of the ball screw shaft and is connected to the cooling fluid inlet and outlet; a sealing component is sealed at both axial ends of the chamber on the outer diameter of the ball screw shaft; the cooling device also has a cooling fluid supply and discharge component connected to the chamber. The above-mentioned cooling device can only be used to cool the screw and nut, and has no cooling effect on the bearings at both ends of the screw. When the screw rotates at high speed, the bearings also rotate at high speed. The thermal deformation caused by the heating of the bearings will also affect the running accuracy of the screw, resulting in reduced working accuracy of the machine tool. Summary of the invention

[0004] The utility model aims to solve the above problems in the prior art and proposes a hollow cooling device for a feed screw, and solves the technical problem of how to improve the cooling effect of the bearings at both ends of the screw.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A hollow cooling device for a feed screw comprises a first bearing seat, a second bearing seat and a screw with a center hole, wherein two ends of the screw are respectively inserted into the first bearing seat and the second bearing seat, a first bearing is arranged between the screw and the first bearing seat, and a second bearing is arranged between the screw and the second bearing seat, and is characterized in that a first cooling groove surrounding the outer peripheral side of the first bearing is arranged in the first bearing seat, a liquid inlet hole and a first liquid outlet hole are arranged on the outer surface of the first bearing seat, both of which are connected with the first cooling groove, the first liquid outlet hole is connected with the center hole of the screw through a first external pipe, a second cooling groove surrounding the outer peripheral side of the second bearing is arranged in the second bearing seat, a liquid passage connecting the second cooling groove and the center hole of the screw is also arranged in the second bearing seat, and a second liquid outlet hole connected with the second cooling groove is arranged on the outer surface of the second bearing seat.

[0007] The coolant enters the first bearing seat from the liquid inlet hole, and then passes through the first cooling groove, the first liquid outlet hole, the first external pipe, the center hole of the screw, the liquid passage of the second bearing seat, the second cooling groove, and then flows out from the second liquid outlet hole of the second bearing seat. When the coolant passes through the first cooling groove and the second cooling groove, it can cool the first bearing and the second bearing respectively, thereby improving the cooling effect of the bearings at both ends of the screw.

[0008] In the above-mentioned hollow cooling device for the feed screw, the center hole passes through the end faces of both ends of the screw, a bearing cover is fixedly connected to the first bearing seat, one end of the screw extends out of the first bearing and is inserted into the bearing cover, an oil seal is arranged between the bearing cover and one end of the screw, a through hole is arranged at the center of the bearing cover, and one end of the first external tube is connected to the through hole.

[0009] When the screw rotates, the bearing cover does not move, and the coolant enters the bearing cover from the through hole after passing through the first external pipe. Due to the sealing effect of the oil seal, the coolant enters the center hole of the screw. In this way, the coolant in the center hole of the screw can be fully utilized to cool the inner ring of the first bearing, thereby improving the cooling effect of the first bearing.

[0010] In the above-mentioned hollow cooling device for the feed screw, the other end of the screw extends out of the second bearing seat, and the end of the center hole located at the other end of the screw is blocked with a plug. The coolant fills the center hole of the screw, and this arrangement can fully utilize the coolant in the center hole of the screw to cool the inner ring of the second bearing, thereby improving the cooling effect of the second bearing.

[0011] In the above-mentioned hollow cooling device for the feed screw, a motor seat is fixedly connected to the second bearing seat, a motor is fixedly connected to the motor seat, the rotating shaft of the motor passes through the motor seat and is connected to the screw, the motor seat has a third cooling groove arranged around the outer circumference of the motor rotating shaft, and a third liquid outlet hole and a liquid through hole are provided on the outer surface of the motor seat, both of which are connected to the third cooling groove, and the liquid through hole and the second liquid outlet hole are connected through a second external pipe.

[0012] The coolant flows out of the second liquid outlet hole, enters the liquid hole through the second external pipe, and then flows out of the third liquid outlet hole after passing through the third cooling groove. The coolant can cool the motor when passing through the motor seat, thereby improving the cooling effect of the motor.

[0013] In the above-mentioned hollow cooling device for the feed screw, the third cooling groove is arranged on the end surface where the motor seat and the motor housing are in contact, so that the third cooling groove can be close to the motor, thereby better cooling the motor.

[0014] In the above-mentioned feeding screw hollow cooling device, the rotating shaft of the motor is sleeved on the outside of the screw and forms a spline connection. The spline connection makes the rotating shaft of the motor and the screw circumferentially fixed, and the rotation of the motor can drive the screw to rotate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The hollow cooling device for the feed screw can not only cool the screw, but also cool the first bearing and the second bearing, thereby improving the cooling effect of the first bearing and the second bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the hollow cooling device of the feed screw.

[0018] Figure 2 yes Figure 1 A partial enlarged view of the first bearing.

[0019] Figure 3 yes Figure 1 A partial enlarged view of the second bearing.

[0020] In the figure, 1, first bearing seat; 1a, first cooling groove; 1b, liquid inlet; 1c, first liquid outlet; 2, second bearing seat; 2a, second cooling groove; 2b, liquid passage; 2c, second liquid outlet; 2d, cooling groove; 3, screw; 3a, center hole; 4, first bearing; 5, second bearing; 6, first external tube; 7, bearing cover; 7a, through hole; 8, oil seal; 9, plug; 10, motor seat; 10a, third cooling groove; 10b, third liquid outlet; 10c, liquid passage; 11, motor; 12, second external tube. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 As shown, a hollow cooling device for a feed screw comprises a first bearing seat 1, a second bearing seat 2 and a screw 3 having a center hole 3a, the two ends of the screw 3 are respectively passed through the first bearing seat 1 and the second bearing seat 2, a first bearing 4 is arranged between the screw 3 and the first bearing seat 1, and a second bearing 5 is arranged between the screw 3 and the second bearing seat 2. A bearing cover 7 is fixedly connected to the first bearing seat 1, and one end of the screw 3 extends out of the first bearing 4 and is inserted into the bearing cover 7. A motor seat 10 is fixedly connected to the second bearing seat 2, and a motor 11 is fixedly connected to the motor seat 10, and the rotating shaft of the motor 11 passes through the motor seat 10 and is connected to the other end of the screw 3. The rotating shaft of the motor 11 is sleeved on the outer side of the other end of the screw 3 and forms a spline connection.

[0023] like Figure 2 As shown, the first bearing seat 1 is provided with a first cooling groove 1a surrounding the outer peripheral side of the first bearing 4, and the outer surface of the first bearing seat 1 is provided with a liquid inlet hole 1b and a first liquid outlet hole 1c both connected to the first cooling groove 1a, and the first liquid outlet hole 1c is connected to the center hole 3a of the screw 3 through the first external pipe 6. In order to facilitate the processing of the first cooling groove 1a, the first bearing seat 1 includes a first seat body and a first sleeve body that are fixed separately, the first sleeve body is inserted in the first seat body, the first bearing 4 is fixed between the first sleeve body and the screw 3, and the first cooling groove 1a is located between the inner side surface of the first seat body and the outer side surface of the first sleeve body. The center hole 3a passes through the end surface of one end of the screw 3, and the bearing cover 7 is fixedly connected to the first sleeve body. An oil seal 8 is provided between the bearing cover 7 and one end of the screw 3, and a through hole 7a is provided at the center of the bearing cover 7, and one end of the first external pipe 6 is connected to the through hole 7a.

[0024] like Figure 3As shown, the second bearing seat 2 is provided with a second cooling groove 2a surrounding the outer peripheral side of the second bearing 5, and the second bearing seat 2 is also provided with a liquid passage 2b connecting the second cooling groove 2a and the central hole 3a of the screw 3. The outer surface of the second bearing seat 2 is provided with a second liquid outlet 2c connected with the second cooling groove 2a. In order to facilitate the processing of the second cooling groove 2a and the liquid passage 2b, the second bearing seat 2 includes a second seat body, a second sleeve body and a cooling sleeve that are fixed separately. The second sleeve body is inserted in the second seat body, the second bearing 5 is fixed between the second sleeve body and the screw 3, and the second cooling groove 2a is located between the inner side surface of the second seat body and the outer side surface of the second sleeve body. The cooling sleeve is fixed on one end of the second seat body facing the first bearing seat 1, and an annular cooling groove 2d is provided on the inner side surface of the cooling sleeve. The cooling groove 2d is connected with the inlet of the cooling channel, and sealing rings are fixed on both sides of the cooling groove 2d on the inner side surface of the cooling sleeve, and the sealing rings form a seal with the screw 3. The outer surface of the lead screw 3 is provided with radial holes corresponding to and connected with the cooling groove 2d, and the radial holes are connected with the center hole 3a of the lead screw 3. The center hole 3a passes through the end surface of the other end of the lead screw 3, and the other end of the lead screw 3 extends out of the second bearing seat 2. The end of the center hole 3a located at the other end of the lead screw 3 is blocked with a plug 9, which is inserted into the center hole 3a and is threadedly connected with the lead screw 3. The motor seat 10 is fixed on the second seat body, and the motor seat 10 is provided with a third cooling groove 10a arranged around the outer peripheral side of the rotating shaft of the motor 11. The outer surface of the motor seat 10 is provided with a third liquid outlet 10b and a liquid through hole 10c, both of which are connected with the third cooling groove 10a, and the liquid through hole 10c is connected with the second liquid outlet 2c through the second external pipe 12. The third cooling groove 10a is arranged on the end surface of the motor seat 10 and the outer shell of the motor 11.

[0025] The coolant enters the first bearing seat 1 from the liquid inlet hole 1b, and then passes through the first cooling groove 1a, the first liquid outlet hole 1c, the first external pipe 6, the through hole 7a of the bearing cover 7, the center hole 3a of the screw 3, the radial hole of the screw 3, the cooling groove 2d of the cooling sleeve, the liquid passage 2b of the second bearing seat 2, the second cooling groove 2a, the second liquid outlet hole 2c, the second external pipe 12, the liquid passage hole 10c of the motor seat 10 and the third cooling groove 10a, and then flows out from the third liquid outlet hole 10b. When the coolant passes through the first cooling groove 1a and the second cooling groove 2a, it can cool the first bearing 4 and the second bearing 5 respectively, when passing through the center hole 3a of the screw 3, it can cool the inner rings of the first bearing 4 and the second bearing 5, and when passing through the motor seat 10, it can cool the motor 11, thereby improving the cooling effect of the bearings at both ends of the screw 3 and the motor 11.

[0026] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A feed screw hollow cooling device, comprising a first bearing seat (1), a second bearing seat (2) and a screw (3) having a center hole (3a), wherein two ends of the screw (3) are respectively inserted into the first bearing seat (1) and the second bearing seat (2), a first bearing (4) is arranged between the screw (3) and the first bearing seat (1), and a second bearing (5) is arranged between the screw (3) and the second bearing seat (2), characterized in that: The first bearing seat (1) is provided with a first cooling groove (1a) surrounding the outer peripheral side of the first bearing (4); the outer surface of the first bearing seat (1) is provided with a liquid inlet hole (1b) and a first liquid outlet hole (1c) both connected to the first cooling groove (1a); the first liquid outlet hole (1c) is connected to the central hole (3a) of the screw (3) through a first external pipe (6); the second bearing seat (2) is provided with a second cooling groove (2a) surrounding the outer peripheral side of the second bearing (5); the second bearing seat (2) is also provided with a liquid passage (2b) connecting the second cooling groove (2a) and the central hole (3a) of the screw (3); the outer surface of the second bearing seat (2) is provided with a second liquid outlet hole (2c) connected to the second cooling groove (2a).

2. The hollow cooling device for feed screw according to claim 1, characterized in that: The center hole (3a) passes through the end surfaces of both ends of the lead screw (3); a bearing cover (7) is fixedly connected to the first bearing seat (1); one end of the lead screw (3) extends out of the first bearing (4) and is inserted into the bearing cover (7); an oil seal (8) is provided between the bearing cover (7) and one end of the lead screw (3); a through hole (7a) is provided at the center of the bearing cover (7); and one end of the first external pipe (6) is connected to the through hole (7a).

3. The hollow cooling device for feed screw according to claim 2, characterized in that: The other end of the lead screw (3) extends out of the second bearing seat (2), and the end of the center hole (3a) located at the other end of the lead screw (3) is sealed with a plug (9).

4. The hollow cooling device for feed screw according to any one of claims 1 to 3, characterized in that: The second bearing seat (2) is fixedly connected to a motor seat (10), the motor seat (10) is fixedly connected to a motor (11), the rotating shaft of the motor (11) passes through the motor seat (10) and is connected to the lead screw (3), the motor seat (10) is provided with a third cooling groove (10a) arranged around the outer circumference of the rotating shaft of the motor (11), the outer surface of the motor seat (10) is provided with a third liquid outlet (10b) and a liquid passage hole (10c) both connected to the third cooling groove (10a), and the liquid passage hole (10c) and the second liquid outlet (2c) are connected via a second external pipe (12).

5. The hollow cooling device for feed screw according to claim 4, characterized in that: The third cooling groove (10a) is arranged on the end surface where the motor base (10) and the motor (11) housing are in contact.

6. The hollow cooling device for feed screw according to claim 4, characterized in that: The rotating shaft of the motor (11) is sleeved on the outside of the lead screw (3) to form a spline connection.

Images