Ball screw pair with cooling function

Abstract

The utility model belongs to the technical field of lead screw cooling, and mainly relates to a ball screw pair with a cooling function, which is characterized by comprising a lead screw and a servo motor, the servo motor drives the lead screw to rotate through a coupling, a cooling channel is arranged in the lead screw, and one end of the cooling channel is communicated with the inside of the coupling; the fan blows cooling airflow to the other end of the cooling channel; the coupler is provided with an exhaust channel, and the exhaust channel is arranged towards the servo motor. Cooling airflow blown out by the fan can flow into the cooling channel, so that heat generated by the lead screw is taken away, meanwhile, due to the exhaust channel of the coupler, the cooling airflow can also be blown to the servo motor through the exhaust channel, and heat generated by the servo motor is also taken away; air flow is used for cooling, sealing connection is not needed, the complexity of the structure of the cooling device is reduced, the cooling device is simplified, and meanwhile air flow is easy to generate, free of pollution, capable of being repeatedly used and not needed to be recycled.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw cooling, and mainly relates to a ball screw pair with a cooling function. Background Art

[0002] Ball screws are widely used in machine tools, which can greatly improve the sensitivity and positioning accuracy of the feed system. The servo motor is connected to the ball screw through a coupling. After power is turned on, the servo motor drives the ball screw to rotate at high speed, and the ball screw drives the ball nut to move left and right. Due to the friction between the ball screw and the ball nut, the temperature of the ball screw rises, which causes the ball screw to deform, thereby affecting its positioning accuracy.

[0003] The patent application document with publication number CN115070486A discloses a ball screw device with a cooling mechanism and a high-precision CNC machine tool, wherein the ball screw device includes a coolant pipe and a distribution shaft, the coolant pipe is arranged in the screw through hole, a liquid inlet hole is arranged on the front end face of the distribution shaft, the liquid inlet hole is sealed and connected to the front side of the coolant pipe, and the liquid inlet hole is connected to a liquid inlet joint; a liquid outlet hole is arranged on the side wall of the distribution shaft, and the liquid outlet hole is connected to a liquid return joint; the rear side of the screw is connected to the servo motor through a coupling.

[0004] Although the cooling mechanism in the ball screw device can cool the ball screw device, since the cooling mechanism uses a liquid medium for cooling, the cooling mechanism requires a sealed connection to ensure that the liquid medium does not leak from the coolant pipe. Therefore, the structure of the cooling mechanism is relatively complex and has high requirements. At the same time, due to the complex structure and high requirements, the cooling mechanism is also prone to damage, which weakens the cooling effect. Utility Model Content

[0005] The utility model provides a ball screw pair with a cooling function to solve the problem that the structure of the cooling mechanism in the prior art is too complicated.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A ball screw pair with cooling function, characterized by comprising:

[0008] A screw and a servo motor at one end of the screw, the servo motor drives the screw to rotate through a coupling, a cooling channel is provided in the screw, and one end of the cooling channel is connected to the interior of the coupling;

[0009] A fan blows cooling air to the other end of the cooling channel;

[0010] The coupling has an exhaust passage communicating with the inside and outside of the coupling, and the exhaust passage is arranged toward the servo motor so that the cooling air flow blows toward the servo motor.

[0011] It has the following beneficial effects: the cooling air flow blown out by the fan will flow into the cooling channel, thereby taking away the heat generated by the screw, which will improve the positioning accuracy of the screw, and at the same time, due to the exhaust channels of the coupling itself, the cooling air flow can also be blown to the servo motor through these exhaust channels, thereby also taking away the heat generated by the servo motor; compared with liquid cooling, the use of air flow for cooling does not require a sealed connection, reducing the complexity of the cooling device structure and simplifying it, and at the same time, the generation of air flow is relatively simple, pollution-free, reusable, and does not require recycling.

[0012] Furthermore, the cooling device also includes a guide tube, which is connected to the other end of the screw rod via a rotating connector so that the guide tube and the screw rod can rotate relative to each other, and the fan blows cooling air into the guide tube.

[0013] The invention has the following beneficial effects: by providing the guide tube, the installation position of the fan is no longer affected by the position of the screw rod, and the installation position of the fan is optimized.

[0014] Furthermore, the rotary connector includes a first part and a second part which are plugged together and can rotate relatively, the first part is connected to the screw rod, and the second part is connected to the guide tube.

[0015] Furthermore, the cooling device also includes a muffler connecting the flow guide pipe and the second part.

[0016] The muffler has the following beneficial effects: the muffler can reduce the noise generated when the airflow flows, thereby improving the working environment when the ball screw pair is used.

[0017] Further, the first part is assembled with the screw thread, and / or the second part is assembled with the muffler thread.

[0018] Furthermore, the cooling device includes a horn joint connected to the guide pipe, the fan includes rotating blades arranged in the horn joint, and also includes a fan motor that drives the rotating blades to rotate.

[0019] Furthermore, an anti-corrosion heat-conducting bushing is provided on the inner wall of the cooling channel.

[0020] The invention has the following beneficial effects: the anti-corrosion heat-conducting bushing can effectively prevent the internal rust of the screw rod, thereby extending the service life of the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figure 1 It is a front view of the utility model;

[0023] Figure 2 It is a bottom view of the utility model;

[0024] Figure 3 for Figure 2 Sectional view along AA direction;

[0025] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0026] Description of reference numerals:

[0027] 1. Servo motor; 2. Coupling; 3. Screw; 4. Nut; 5. Fan; 6. Horn connector; 7. Muffler; 8. Flow guide pipe; 9. Rotating connector; 10. Bracket; 11. Rotating blades; 12. Flow space; 13. Muffler space; 14. Cooling channel; 15. Connector space; 16. Anti-corrosion thermal bushing. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0030] like Figure 1-Figure 4As shown, a ball screw pair with cooling function, the cooling device is used to cool the ball screw pair and the servo motor 1. The cooling device, the ball screw pair and the servo motor 1 are all installed on the machine tool. The servo motor 1 drives the screw 3 in the ball screw pair to rotate through the coupling 2, so that the nut 4 of the ball screw pair can move. A coaxial cooling channel 14 is opened in the screw 3, and the coupling 2 has an exhaust channel connected to the cooling channel 14. The exhaust channel is provided by the coupling 2 itself and does not need to be set up again; or an exhaust channel is specially set on the coupling 2, but the exhaust channel in the above two cases needs to connect the inside and outside of the coupling 2 and be arranged toward the servo motor 1. For example, in the device described in the patent application document with publication number CN113389819A, the cooling airflow can flow out from the assembly hole and flow to the servo motor 1.

[0031] The cooling device includes a fan 5, a horn joint 6, a guide tube 8, a muffler 7, and a cooling channel 14 arranged inside the screw rod 3. The fan 5 is used to generate a cooling airflow, and the cooling airflow flows into the cooling channel 14 inside the screw rod 3 through the guide tube 8, so as to timely guide out the heat generated by the friction between the screw rod 3 and the nut 4, thereby improving the positioning accuracy of the screw rod 3.

[0032] The fan 5 is installed on the machine tool through a bracket 10. The fan 5 has a rotatable rotating blade 11, and airflow can be generated by the rotation of the rotating blade 11. The horn joint 6 has a flow space 12 inside, and the rotating blade 11 is located in the flow space 12, and the rotating blade 11 can rotate in the flow space 12.

[0033] Specifically, a guide pipe 8, a silencer 7 and a rotary connector 9 are connected in sequence between the horn joint 6 and the screw rod 3, wherein the horn joint 6 is installed on the machine tool. The silencer 7 has a silencer space 13, and the silencer 7 and the horn joint 6 are connected by a guide pipe 8. The guide pipe 8 connects the flow space 12 and the silencer space 13. The silencer 7 can reduce and eliminate the noise of the air flow, thereby improving the working environment when using the ball screw pair and benefiting the health of the relevant users. The guide pipe 8 can be connected to the corresponding silencer 7 and the horn joint 6 by threaded connection, which is convenient for later replacement and maintenance; at the same time, by setting the guide pipe 8, the installation position of the fan 5 is no longer affected by the position of the screw rod 3, and the installation position of the fan 5 is optimized. The silencer 7 in this embodiment can be the device described in the patent application document with publication number CN112628215A.

[0034] The screw rod 3 and the muffler 7 are rotatably connected via a rotary connector 9, which is respectively connected to the corresponding screw rod 3 and the muffler 7 by threaded connection, so as to facilitate later replacement and maintenance. The rotary connector 9 has a first part and a second part that can be coaxially plugged and relatively rotated, the first part connects the screw rod 3, and the second part connects the muffler 7. The rotary connector 9 has a joint space 15 that runs through both ends thereof, and the joint space 15 is respectively connected to the cooling channel 14 and the muffler space 13. The rotary connector 9 in this embodiment can be a device described in a Chinese patent document with a publication number of CN101949268B.

[0035] The rotating blades 11 rotate in the flow space 12, thereby generating airflow, which will flow along the guide pipe 8 to the muffler 7. The muffler 7 will reduce and eliminate the noise generated by the flow of the airflow. Then the airflow will flow through the joint space 15 to the cooling channel 14, where it will take away the heat of the screw 3, and then blow to the servo motor 1 through the exhaust channel of the coupling 2 to cool the servo motor 1.

[0036] In order to prevent the cooling channel 14 inside the screw rod 3 from rusting, an anti-corrosion heat-conducting bushing 16 is provided on the inner wall of the cooling channel 14, and the anti-corrosion heat-conducting bushing 16 can effectively extend the service life of the screw rod 3. In practice, the anti-corrosion heat-conducting bushing 16 described in this embodiment is sprayed into the cooling channel 14, and the anti-corrosion heat-conducting bushing 16 in this embodiment can be sprayed with the coating described in the Chinese patent document with the authorization announcement number CN115926586B.

[0037] In order to ensure the continuity and smoothness of the rotation of the screw rod 3, the servo motor 1, the coupling 2, the screw rod 3, the muffler 7 and the rotary connector 9 are all required to be coaxial so that the above-mentioned components rotate around the same axis.

[0038] The rotating blades 11 of the fan 5 rotate at high speed in the horn joint 6, so that a cooling airflow is generated in the horn joint 6. The cooling airflow is gathered by the horn joint 6 and then flows into the cooling channel 14, thereby taking away the heat generated by the screw 3, improving the positioning accuracy of the screw 3. At the same time, due to the exhaust channels of the coupling 2 itself, the cooling airflow can also be blown to the servo motor 1 through these exhaust channels, thereby also taking away the heat generated by the servo motor 1. Compared with liquid cooling, the use of airflow for cooling does not require a sealed connection, which reduces the complexity of the cooling device structure and simplifies it. At the same time, the generation of airflow is relatively simple, pollution-free, reusable, and does not require recycling, saving the device for recycling airflow, and the cooling airflow can be directly discharged into the surrounding environment.

Claims

1. A ball screw pair with cooling function, characterized in that: include: A screw rod (3) and a servo motor (1) located at one end of the screw rod (3), wherein the servo motor (1) drives the screw rod (3) to rotate via a coupling (2), wherein a cooling channel (14) is provided through the screw rod (3), and one end of the cooling channel (14) is connected to the interior of the coupling (2); A fan (5) blows a cooling airflow toward the other end of the cooling channel (14); The coupling (2) has an exhaust passage communicating with the inside and outside of the coupling (2), and the exhaust passage is arranged toward the servo motor (1) so that a cooling air flow blows toward the servo motor (1).

2. A ball screw pair with cooling function according to claim 1, characterized in that: The cooling device also includes a flow guide pipe (8), wherein the flow guide pipe (8) is connected to the other end of the screw rod (3) via a rotating connector (9) so that the flow guide pipe (8) and the screw rod (3) can rotate relative to each other, and the fan (5) blows cooling air into the flow guide pipe (8).

3. The ball screw pair with cooling function according to claim 2, characterized in that: The rotary connector (9) comprises a first part and a second part which are plugged together and can rotate relative to each other, the first part is connected to the screw rod (3), and the second part is connected to the flow guide tube (8).

4. The ball screw pair with cooling function according to claim 3, characterized in that: The cooling device further comprises a muffler (7) connecting the flow guide pipe (8) and the second part.

5. The ball screw pair with cooling function according to claim 4, characterized in that: The first part is threadedly assembled with the screw rod (3), and / or the second part is threadedly assembled with the muffler (7).

6. A ball screw pair with cooling function according to any one of claims 2 to 5, characterized in that: The cooling device comprises a horn joint (6) connected to the guide pipe (8), the fan (5) comprises a rotating blade (11) arranged in the horn joint (6), and also comprises a fan (5) motor driving the rotating blade (11) to rotate.

7. A ball screw pair with cooling function according to any one of claims 1 to 5, characterized in that: An anti-corrosion heat-conducting bushing (16) is provided on the inner wall of the cooling channel (14).

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